Method of manufacturing silver nanowires

A process for manufacturing silver nanowires is provided, wherein the recovered silver nanowires have a high aspect ratio; and, wherein the total glycol concentration is <0.001 wt % at all times during the process.

Method for making porous acicular mullite bodies

Acicular mullite bodies are made in two-step firing process in which a green body is converted first to a fluorotopaz and then to acicular mullite. The bodies are contained within an enclosed region of the furnace. A flow of process gas is provided through the enclosed region during the fluorotopaz-forming step. The process gas is introduced into the enclosed region through multiple openings on at least one side of the enclosed region, and withdrawn through multiple openings on another side of the enclosed region. During the acicular mullite-forming step, a flow of purge gas is maintained in the exterior portion of the furnace. This purge gas may be removed by flowing it into the enclosed region of the furnace and out of the furnace from the enclosed region without re-entering the exterior portion for the furnace.

HYDROTHERMAL METHOD FOR MANUFACTURING FILTERED SILVER NANOWIRES

A method for manufacturing filtered high aspect ratio silver nanowires is provided, wherein a total glycol concentration is <0.001 wt % at all times.

Method for making porous acicular mullite bodies

Acicular mullite bodies are made in two-step firing process in which a green body is converted first to a fluorotopaz and then to acicular mullite. The bodies are contained within an enclosed region of the furnace. A flow of process gas is provided through the enclosed region during the fluorotopaz-forming step. The process gas is introduced into the enclosed region through multiple openings on at least one side of the enclosed region, and withdrawn through multiple openings on another side of the enclosed region. During the acicular mullite-forming step, a flow of purge gas is maintained in the exterior portion of the furnace. This purge gas may be removed by flowing it into the enclosed region of the furnace and out of the furnace from the enclosed region without re-entering the exterior portion for the furnace.

Carbon Molecular Sieve Membrane Produced From A Carbon Forming Polymer-Polyvinylidene Chloride Copolymer Blend

A carbon molecular sieve (CMS) membrane may advantageously be made by pyrolyzing a membrane precursor composition comprised of a carbon forming polymer (e.g., polyimide) blended with a polyvinylidene chloride copolymer (PVDC), the polyvinylidene chloride copolymer being the reaction product of at least 60% to 97% by weight of vinylidene chloride and at least one other comonomer and the carbon forming polymer to polyvinylidene chloride copolymer has a weight ratio of greater than 1 to 99. The membrane precursor composition may be formed by dissolving the carbon forming polymer and PVDC in a solvent to form a dope solution. The dope solution may be shaped, for example, into an asymmetric hollow fiber. The asymmetric hollow fiber may be heated to a temperature to dehydrochorinate the PVDC and then subsequently heated in a non-oxidizing atmosphere to carbonize the polymers of the shaped membrane to form the CMS membrane. 1. A membrane precursor composition comprised of a carbon forming polymer blended with a polyvinylidene chloride copolymer , the polyvinylidene chloride copolymer being the reaction product of at least 60% to 97% by weight of vinylidene chloride and at least one other comonomer and the carbon forming polymer to polyvinylidene chloride copolymer has a weight ratio of greater than 1 to 99.2. The membrane precursor of claim 1 , wherein the carbon forming polymer is a polyimide claim 1 , polyetherimide claim 1 , polyamide claim 1 , polyvinyl chloride claim 1 , polyvinylidene fluoride claim 1 , cellulose acetate claim 1 , polyacrylonitrile claim 1 , polyphenylene claim 1 , or combination thereof.3. The membrane of claim 1 , wherein the carbon forming polymer is polyimide.4. The membrane precursor of claim 1 , wherein the comonomer is vinyl monomer claim 1 , vinyl chloride monomer claim 1 , an acrylate monomer claim 1 , a methacrylate monomer claim 1 , a styrenic monomer claim 1 , acrylonitrile claim 1 , methacrylonitrile claim 1 , itaconic acid claim 1 , ...

SEPARATION OF GASES VIA CARBONIZED VINYLIDENE CHLORIDE COPOLYMER GAS SEPARATION MEMBRANES AND PROCESSES THEREFOR

A process for separating hydrogen from a gas mixture having hydrogen and a larger gas molecule is comprised of flowing the gas mixture through a carbonized polyvinylidene chloride (PVDC) copolymer membrane having a hydrogen permeance in combination with a hydrogen/methane selectivity, wherein the combination of hydrogen permeance and hydrogen/methane selectivity is (i) at least 30 GPU hydrogen permeance and at least 200 hydrogen/methane selectivity or (ii) at least 10 GPU hydrogen permeance and at least 700 hydrogen/methane selectivity. The carbonized PVDC copolymer may be made by heating and restraining a polyvinylidene chloride copolymer film or hollow fiber having a thickness of 1 micrometer to 250 micrometers to a pretreatment temperature of 100° C. to 180° C. to form a pretreated polyvinylidene chloride copolymer film and then heating and restraining the pretreated polyvinylidene chloride copolymer film to a maximum pyrolysis temperature from 350° C. to 750° C. 1. A process for separating hydrogen from a gas mixture having hydrogen and a larger gas molecule , the method comprising(i) providing a carbonized polyvinylidene chloride copolymer membrane having a hydrogen permeance in combination with a hydrogen/methane selectivity, wherein the combination of hydrogen permeance and hydrogen/methane selectivity is (i) at least 30 GPU hydrogen permeance and at least 200 hydrogen/methane selectivity or (ii) at least 10 GPU hydrogen permeance and at least 700 hydrogen/methane selectivity; and(ii) flowing the gas mixture through said carbonized polyvinylidene chloride copolymer membrane to produce a permeate first stream having an increased concentration of the hydrogen and a second retentate stream having an increased concentration of the larger gas molecule.2. The process of claim 1 , wherein the larger gas molecule is comprised of olefins and paraffins.3. The process of claim 1 , wherein the larger gas molecule is comprised of at least one of carbon dioxide claim 1 , ...

SEPARATION OF GASES VIA CARBONIZED VINYLIDENE CHLORIDE COPOLYMER GAS SEPARATION MEMBRANES AND PROCESSES THEREFOR

A carbonized PVDC copolymer useful for the separation of an olefin from its corresponding paraffin may be made by heating a polyvinylidene chloride copolymer film or hollow fiber having a thickness of 1 micrometer to 20 micrometers to a pretreatment temperature of 100° C. to 180° C. to form a pretreated polyvinylidene chloride copolymer film and then heating the pretreated polyvinylidene chloride copolymer film to a maximum pyrolysis temperature from 350° C. to 750° C. A process for separating an olefin from its corresponding paraffin in a gas mixture is comprised of flowing the gas mixture through the aforementioned carbonized polyvinylidene chloride (PVDC) copolymer to produce a permeate first stream having an increased concentration of the olefin and a second retentate stream having an increased concentration of its corresponding paraffin. 1. A method of making a carbonized polyvinylidene chloride copolymer useful to separate an olefin from its corresponding paraffin comprising ,(a) providing a polyvinylidene chloride copolymer film or hollow fiber having a thickness of 1 micrometer to 20 micrometers,(b) heating the polyvinylidene chloride copolymer film to a pretreatment temperature of 100° C. to 180° C. to form a pretreated polyvinylidene chloride copolymer film, and(c) heating the pretreated polyvinylidene chloride copolymer film to a maximum pyrolysis temperature from 350° C. to 750° C.2. The method of claim 1 , wherein the film or fiber is restrained in steps (b) and (c) by applying a force.3. The method of claim 1 , wherein the maximum pyrolysis temperature is at most 650° C.4. The method of claim 1 , wherein the polyvinylidene chloride copolymer film is a polyvinylidene chloride copolymer comprised of vinylidene chloride and at least one of the following: a vinyl monomer; a vinyl chloride monomer; an acrylate monomer; a methacrylate monomer; a styrenic monomer; acrylonitrile claim 1 , methacrylonitrile; itaconic acid; chlorotrifluoroethylene that have been ...

HYDROTHERMAL METHOD FOR MANUFACTURING SILVER NANOWIRES

A method for manufacturing high aspect ratio silver nanowires is provided, wherein a total glycol concentration is <0.001 wt % at all times. 1. A method for manufacturing high aspect ratio silver nanowires , comprising:providing a container;providing water;providing a reducing sugar;providing a polyvinyl pyrrolidone (PVP), wherein the polyvinyl pyrrolidone (PVP) provided is dividable into a first part of the polyvinyl pyrrolidone (PVP) and a second part of the polyvinyl pyrrolidone (PVP);providing a source of copper (II) ions;providing a source of halide ions;providing a source of silver ions, wherein the source of silver ions provided is dividable into a first portion of the source of silver ions and a second portion of the source of silver ions;adding the water, the reducing sugar, the source of copper (II) ions and the source of halide ions to the container to form a combination;heating the combination to 110 to 160° C.;comingling the first part of the polyvinyl pyrrolidone (PVP) with the first portion of the source of silver ions to form a comingled polyvinyl pyrrolidone/source of silver ions;adding the comingled polyvinyl pyrrolidone/source of silver ions to the combination in the container to form a creation mixture; then, following a delay period, adding to the container the second part of the polyvinyl pyrrolidone (PVP) and the second portion of the source of silver ions to form a growth mixture;maintaining the growth mixture at 110 to 160° C. for a hold period of 2 to 30 hours to provide a product mixture; and,recovering a plurality of high aspect ratio silver nanowires from the product mixture;wherein a total glycol concentration in the container is <0.001 wt %.2. The method of claim 1 , further comprising:maintaining the combination at 120 to 155° C. during addition of the comingled polyvinyl pyrrolidone/source of silver ions and during the delay period; and,maintaining the growth mixture at 120 to 140° C. during the hold period.3. The method of claim 1 , ...

METHOD OF MANUFACTURING SILVER NANOWIRES

A process for manufacturing silver nanowires is provided, wherein the recovered silver nanowires have a high aspect ratio; and, wherein the total glycol concentration is <0.001 wt % at all times during the process. 1. A process for manufacturing high aspect ratio silver nanowires , comprising:providing a container;providing water;providing a reducing sugar;providing a polyvinyl pyrrolidone (PVP);providing a source of copper (II) ions;providing a source of halide ions;providing a source of silver ions;providing a pH adjusting agent;adding the water, the reducing sugar, the polyvinyl pyrrolidone (PVP), the source of copper (II) ions, the source of halide ions, and the pH adjusting agent to the container to form a combination, wherein the combination has a pH of 2.0 to 4.0;heating the combination to 110 to 160° C.;then adding the source of silver ions to the container to form a growth mixture;then maintaining the growth mixture at 110 to 160° C. for a hold period of 2 to 30 hours to provide a product mixture; and,recovering a plurality of high aspect ratio silver nanowires from the product mixture; and,wherein a total glycol concentration in the container is <0.001 wt % at all times during the process.2. The process of claim 1 , further comprising:dividing the source of silver ions into a first portion and a second portion;heating the combination to 140 to 160° C.;then adding the first portion to the container to form a creation mixture;then cooling the creation mixture to 110 to 135° C. during a delay period;following the delay period, adding the second portion to the container to form the growth mixture.3. The process of claim 2 , wherein the growth mixture is maintained at 110 to 135° C. during the hold period.4. The process of claim 3 , wherein the reducing sugar provided is glucose.5. The process of claim 3 , wherein the polyvinyl pyrrolidone (PVP) provided has a weight average molecular weight claim 3 , M claim 3 , of 40 claim 3 ,000 to 150 claim 3 ,000 Daltons.6 ...

SILVER NANOWIRE MANUFACTURING METHOD

A process for manufacturing silver nanowires is provided, wherein the recovered silver nanowires have a high aspect ratio; and, wherein the total glycol concentration is <0.001 wt % at all times during the process. 1. A method for manufacturing high aspect ratio silver nanowires , comprising:providing a container;providing water;providing a reducing sugar;providing a reducing agent;providing a polyvinyl pyrrolidone (PVP), wherein the polyvinyl pyrrolidone (PVP) provided is divided into a first part of the polyvinyl pyrrolidone (PVP) and a second part of the polyvinyl pyrrolidone (PVP);providing a source of copper (II) ions;providing a source of halide ions;providing a source of silver ions, wherein the source of silver ions provided is divided into a first portion of the source of silver ions and a second portion of the source of silver ions;adding the water, the reducing sugar, the source of copper (II) ions and the source of halide ions to the container to form a combination;heating the combination to 110 to 160° C.;adding the first part of the polyvinyl pyrrolidone (PVP), the first portion of the source of silver ions and the reducing agent to the combination in the container to form a creation mixture;then adding to the container the second part of the polyvinyl pyrrolidone (PVP) and the second portion of the source of silver ions to form a growth mixture;maintaining the growth mixture at 110 to 160° C. for a hold period of 2 to 30 hours to provide a product mixture; and,recovering a plurality of high aspect ratio silver nanowires from the product mixture;wherein a total glycol concentration in the container is <0.001 wt % at all times.2. The method of claim 1 , wherein the first part of the polyvinyl pyrrolidone (PVP) and the first portion of the source of silver ions are added to the container simultaneously.3. The method of claim 1 , wherein the first portion of the source of silver ions is added to the combination below a surface of the combination in the ...

METHOD OF MAKING POROUS PLUGS IN CERAMIC HONEYCOMB FILTER

A ceramic plugging paste useful to make plugs having through holes (partial plugs) in a ceramic honeycomb filter in which the plugging paste is comprised of a ceramic particulate and fluid carrier, wherein the ceramic particulate has at least 90% by number of the particulates being less than 50 micrometers and the fluid carrier is present in an amount sufficient such that the plugging paste is fluid enough to be inserted into a ceramic honeycomb channel and be retained in said channel without any other support other than the walls of the honeycomb defining the channel. Such a paste may be easily injected in the same manner as regular pastes. Such pastes and methods advantageously realize plugs having a through hole resulting in honeycomb filters having low pressure drop while still retaining effective particulate filtration. 1. A ceramic honeycomb plugging paste comprised of a ceramic particulate and fluid carrier , wherein the ceramic particulate has at least 90% by number of the particulates being less than 50 micrometers and the fluid carrier is present in an amount sufficient such that the plugging paste is fluid enough to be inserted into a ceramic honeycomb channel and be retained in said channel without any other support other than the walls of the honeycomb defining the channel.2. The plugging paste of claim 1 , wherein the paste has a volume drying shrinkage of at least 5%.3. The plugging paste of claim 1 , wherein the plugging paste is comprised of one or more organic additives.4. The plugging paste of claim 3 , wherein the organic additive is a surfactant claim 3 , porogen claim 3 , binder or combination thereof.5. The plugging paste of claim 1 , wherein the amount of fluid carrier is at least 40% to 90% by volume of the plugging paste.6. The plugging paste of claim 1 , wherein said plugging paste is shear thinning.7. The plugging paste of claim 2 , wherein the plugging paste has a volume sintering shrinkage of at least 5% and a combined volume drying and ...

SUPPORTED CARBON MOLECULAR SIEVE MEMBRANES AND METHOD TO FORM THEM

A supported carbon molecular sieve (CMS) membrane is made by contacting a film of a carbon forming polymer on a polymer textile to form a laminate. The laminate is then heated to a temperature for a time under an atmosphere sufficient to carbonize the film and polymer textile to form the supported CMS membrane. The supported CMS membrane formed is a laminate having a carbon separating layer graphitically bonded to a carbon textile, wherein the carbon separating layer is a continuous film. The supported CMS membranes are particularly useful for separating gases such as olefins from their corresponding paraffins. 1. A method of making a supported carbon molecular sieve membrane , the method comprising:(i) contacting a film of a carbon forming polymer with a polymer textile to form a laminate, the film and polymer textile being comprised of a polymer selected from the group consisting of a polyvinylidene chloride copolymer, polyimide, or combination thereof;(ii) heating the laminate to a carbonization temperature for a time under an atmosphere sufficient to carbonize the film and polymer textile to form the supported carbon molecular sieve membrane comprised of a separating carbon layer supported on a carbon textile layer.2. The method of claim 1 , wherein the carbon forming polymer of the film and the polymer upon heating undergo expansion and contraction at the same temperatures in the same manner.3. The method of claim 1 , wherein the contacting is comprised of heating to a laminating temperature that fuses a portion of the film to the textile claim 1 , the laminating temperature being a temperature that does not carbonize the film and textile.4. The method of claim 3 , wherein the contacting is comprised of hot rolling the film to the textile.5. The method of claim 3 , wherein the separating carbon layer supported on the carbon textile layer are graphitically bonded after step (ii) where the film is fused to the textile.6. The method of claim 1 , wherein the carbon ...

METHOD OF PREPARING HIGH POROSITY CERAMIC MATERIAL

Contacting a mixture of two or more porogens with a mixture used to prepare a ceramic body; wherein one of the porogens has a significantly different chemical property from that of at least one of the other porogens. The ceramic material is dried, and calcinated. The ceramic material must withstand the heat from the drying process and the calcining to become a sintered: (ceramic) body. By increasing the overall stability of the ceramic material the product yield is about 90% or greater. 1. A process comprising: contacting a mixture of two or more porogens with a mixture used to prepare a ceramic body; wherein one of the porogens has a significantly different chemical property from at least one of the other porogens; drying the mixture; and debindering the mixture.2. The process of where at least one of the porogens has a hydrophobic character and at least one of the other porogens has a hydrophilic character.3. The process of where at least one of the porogens has a significantly different burnout temperature than that of at least one of the other porogens.4. The process where the mixture of two or more porogens lengthens the time period for an exothermic reaction during the debindering process.5. The process of where the mixture of two or more porogens reduces a ΔT at anytime to below 120° C.6. The process of where the mixture of two or more porogens comprises graphite and cornstarch.7. The process of wherein the ratio of cornstarch to graphite is about 6:1 to about 1:1.8. The process of where the mixture is exposed to a drying process claim 1 , and a reduction in cracking of the ceramic bodies results.9. The process of wherein calcining is performed in the presence of oxygen without the need to slowly increase the temperature process over an extended period of time.10. The process of wherein after calcining the ceramic body is converted to acicular mullite.11. The process of where at least one of the porogens has an organic carbon product and at least one of the ...

Method for improving the surface finish of additive manufactured articles

An additive elastomeric manufactured part having improved surface finish is made by repeatedly extruding through a nozzle to build up layers of a material comprised of a prepolymer comprised of an isocyanate terminated prepolymer and a filler in an amount such that the material has a shear storage modulus G′ of 100,000 to 300,000 Pa measured at an oscillation rate of 1 Hz and a relaxation time of 20 seconds to 360 seconds. It has been discovered that the particular material having these rheological properties is able to improve the surface finish of the additive manufactured part without slumping and is believed to be due to surface flow of material into valleys between the extrudates as they are being built up.

SEPARATION OF GASES VIA CARBONIZED VINYLIDENE CHLORIDE COPOLYMER GAS SEPARATION MEMBRANES AND PROCESSES THEREFORE

A carbonized PVDC copolymer useful for the separation of an olefin from its corresponding paraffin may be made by heating a polyvinylidene chloride copolymer film or hollow fiber having a thickness of 1 micrometer to 20 micrometers to a pretreatment temperature of 100° C. to 180° C. to form a pretreated polyvinylidene chloride copolymer film and then heating the pretreated polyvinylidene chloride copolymer film to a maximum pyrolysis temperature from 350° C. to 750° C. A process for separating an olefin from its corresponding paraffin in a gas mixture is comprised of flowing the gas mixture through the aforementioned carbonized polyvinylidene chloride (PVDC) copolymer to produce a permeate first stream having an increased concentration of the olefin and a second retentate stream having an increased concentration of its corresponding paraffin. 112.-. (canceled)13. A method of making a carbonized polyvinylidene chloride copolymer useful to separate an olefin from its corresponding paraffin comprising ,(a) providing a polyvinylidene chloride copolymer film or hollow fiber having a thickness of 1 micrometer to 20 micrometers,(b) heating the polyvinylidene chloride copolymer film or hollow fiber to a pretreatment temperature of 100° C. to 180° C. while restraining the polyvinylidene chloride copolymer film or hollow fiber by applying a force to form a pretreated polyvinylidene chloride copolymer film or hollow fiber, and(c) heating the pretreated polyvinylidene chloride copolymer film or hollow fiber to a maximum pyrolysis temperature from 350° C. to 750° C. while restraining the pretreated polyvinylidene chloride copolymer film or hollow fiber by applying a force.14. The method of claim 13 , wherein the maximum pyrolysis temperature is at most 650° C.15. The method of claim 13 , wherein the polyvinylidene chloride copolymer film or hollow fiber is a polyvinylidene chloride copolymer comprised of vinylidene chloride and at least one of the following: a vinyl monomer; a ...

SEPARATION OF GASES VIA CARBONIZED VINYLIDENE CHLORIDE COPOLYMER GAS SEPARATION MEMBRANES AND PROCESSES THEREFOR

A process for separating hydrogen from a gas mixture having hydrogen and a larger gas molecule is comprised of flowing the gas mixture through a carbonized polyvinylidene chloride (PVDC) copolymer membrane having a hydrogen permeance in combination with a hydrogen/methane selectivity, wherein the combination of hydrogen permeance and hydrogen/methane selectivity is (i) at least 30 GPU hydrogen permeance and at least 200 hydrogen/methane selectivity or (ii) at least 10 GPU hydrogen permeance and at least 700 hydrogen/methane selectivity. The carbonized PVDC copolymer may be made by heating and restraining a polyvinylidene chloride copolymer film or hollow fiber having a thickness of 1 micrometer to 250 micrometers to a pretreatment temperature of 100° C. to 180° C. to form a pretreated polyvinylidene chloride copolymer film and then heating and restraining the pretreated polyvinylidene chloride copolymer film to a maximum pyrolysis temperature from 350° C. to 750° C. 115.-. (canceled)16. A method of making a carbonized polyvinylidene chloride copolymer comprising ,(a) providing a polyvinylidene chloride copolymer film or hollow fiber having a thickness of 1 micrometer to 250 micrometers,(b) heating and restraining the polyvinylidene chloride copolymer film to a pretreatment temperature of 100° C. to 180° C. to form a pretreated polyvinylidene chloride copolymer film, and(c) heating and restraining the pretreated polyvinylidene chloride copolymer film to a maximum pyrolysis temperature from 350° C. to 750° C.17. The method of claim 16 , wherein the restraining of steps (b) and (c) is by applying a compressive force.18. The method of or claim 16 , wherein the maximum pyrolysis temperature is at most 650° C.19. The method of claim 16 , wherein the polyvinylidene chloride copolymer film is a polyvinylidene chloride copolymer comprised of vinylidene chloride and at least one of the following: a vinyl monomer; a vinyl chloride monomer; an acrylate monomer; a methacrylate ...

METHOD FOR ADDITIVE MANUFACTURING POROUS INORGANIC STRUCTURES AND COMPOSITES MADE THEREFROM

A porous inorganic additive manufactured article that is comprised of at least two layers of inorganic particulates bound together by a carbon binding phase throughout. The additive manufactured article may be formed by additive manufacturing using a mixture comprised of an organic reactive material and inorganic particulates, wherein the organic reactive material is subsequently reacted to form a thermoset material that forms carbon upon heating that binds the inorganic particulates together to form the porous inorganic additive manufactured article. The porous inorganic additive manufactured article may then be infiltrated with a liquid that is solidified to form a composite article or may be further heated in a differing atmosphere to form a further sintered or reacted porous inorganic article. 1. A method of additive manufacturing a porous inorganic part comprising ,(i) providing a mixture comprised of an organic reactive material and inorganic particulates,(ii) dispensing said mixture through a nozzle to form an extrudate deposited on a base,(iii) moving the base, nozzle or combination thereof while dispensing the mixture so that there is horizontal displacement between the base and nozzle in a predetermined pattern to form an initial layer of the mixture on the base,(iv) repeating steps (ii) and (iii) to form a successive layer of the mixture adhered on the initial layer to form an additive manufactured part,(v) allowing the organic reactive material to react forming a thermoset material that forms carbon upon heating and(vi) heating the additive manufactured part in an atmosphere to a temperature where the thermoset material decomposes and forms a carbon phase that binds the inorganic particulates to form the porous inorganic part.2. The method of claim 1 , wherein the method further comprises infiltrating a liquid into the porous inorganic part and then solidifying the liquid to form a composite part.3. (canceled)4. (canceled)5. (canceled)6. The method of ...

Carbon Molecular Sieve Adsorbents Prepared From Activated Carbon and Useful For Propylene-Propane Separation

A process to prepare a carbon molecular sieve adsorbent composition comprises steps beginning with an activated carbon having specific effective micropore size. The activated carbon is impregnated with monomers or partially polymerized polymer, allowed to complete polymerization, and then carbonized such that the impregnant shrinks the micropores to another specific effective micropore size. Finally, the impregnated/polymerized/carbonized product is annealed at a temperature ranging from 1000° C. to 1500° C., which ultimately and predictably shrinks the micropores to a size ranging from 4.0 Angstroms to 4.3 Angstroms. The invention surprisingly enables fine tuning of the effective micropore size, as well as desirable selectivity, capacity and adsorption rates, to obtain highly desirable carbon molecular sieving capability particularly suited for use in, for example, fixed beds in pressure swing or temperature swing processes to enable propylene/propane separations. 1. A process to prepare a carbon molecular sieve adsorbent composition comprising: (1) impregnating the activated carbon with at least one monomer and then polymerizing the at least one monomer such that the polymer is formed; or', '(2) impregnating the activated carbon with at least one partially polymerized monomer and allowing or facilitating completion of polymerization of the at least one partially polymerized monomer after impregnation such that the polymer is formed;, 'depositing polymer on an activated carbon, the activated carbon comprising micropores having, as a whole, an effective micropore size greater than 6 Angstroms, wherein the polymer is deposited in or around the micropores, the deposition being performed by eithercarbonizing the activated carbon and the deposited polymer together at a temperature of from 400° C. to 1000° C. to form a modified activated carbon having, as a whole, micropores that have an effective micropore size ranging from greater than 4.3 Angstroms to 6 Angstroms; and ...

Hydrothermal method for manufacturing filtered silver nanowires

A method for manufacturing filtered high aspect ratio silver nanowires is provided, wherein a total glycol concentration is <0.001 wt % at all times.

Process for the preparation of silver nanowires

Es wird ein Verfahren zur Herstellung von Silber-Nanodrähten bereitgestellt, wobei die gewonnen Silber-Nanodrähte ein hohes Seitenverhältnis aufweisen und wobei die Glykolgesamtkonzentration während des gesamten Verfahrens < 0,001 Gew.-% ist. There is provided a method of making silver nanowires wherein the recovered silver nanowires have a high aspect ratio and wherein the total glycol concentration throughout the process is <0.001 wt%.

HYDROTHERMAL PROCESS FOR MANUFACTURING SILVER NANOFILS FILTERS

L'invention concerne un procédé pour fabriquer des nanofils d'argent filtrés ayant un rapport d'aspect élevé, où la concentration en glycols totale est < 0,001 % en poids à tout moment. The invention relates to a method for producing filtered silver nanowires having a high aspect ratio, wherein the total glycol concentration is <0.001% by weight at any time.

Separation of gases via carbonized vinylidene chloride copolymer gas separation membranes and process for the preparation of the membranes

A carbonized PVDC copolymer useful for the separation of an olefin from its corresponding paraffin may be made by heating a polyvinylidene chloride copolymer film or hollow fiber having a thickness of 1 micrometer to 20 micrometers to a pretreatment temperature of 100°C to 180°C to form a pretreated polyvinylidene chloride copolymer film and then heating the pretreated polyvinylidene chloride copolymer film to a maximum pyrolysis temperature from 350°C to 750°C. A process for separating an olefin from its corresponding paraffin in a gas mixture is comprised of flowing the gas mixture through the aforementioned carbonized polyvinylidene chloride (PVDC) copolymer to produce a permeate first stream having an increased concentration of the olefin and a second retentate stream having an increased concentration of its corresponding paraffin.

Supported carbon molecular sieve membranes and method to form them

A supported carbon molecular sieve (CMS) membrane is made by contacting a film of a carbon forming polymer on a polymer textile to form a laminate. The laminate is then heated to a temperature for a time under an atmosphere sufficient to carbonize the film and polymer textile to form the supported CMS membrane. The supported CMS membrane formed is a laminate having a carbon separating layer graphitically bonded to a carbon textile, wherein the carbon separating layer is a continuous film. The supported CMS membranes are particularly useful for separating gases such as olefins from their corresponding paraffins.

Method of preparing carbon molecular sieve adsorbents from activated carbon and a polymer

Catalyst support comprising mesoporous carbon

A carbon composition used for preparing a catalyst support structure including an admixture of: (a) a mesoporous material having mesoporous particles; and (b) a macro-molecule carbon forming binder; a process for producing the carbon composition; a carbon support structure; a process for producing the carbon support structure; a multi-metallic catalyst including (A) an annealed pyrolyzed carbon structure having an enhanced mesoporosity and mesopore size; and (B) at least two or more metallic particles disposed throughout the mesoporosity of the annealed pyrolyzed carbon structure; and a process for producing the multi-metallic catalyst.

PROCESS FOR MANUFACTURING SILVER NANOWLAS

Un procédé pour fabriquer des nanofils d'argent est fourni, où les nanofils d'argent récupérés ont un rapport d'aspect élevé; et où la concentration en glycols totale est < 0,001 % en poids à tout moment pendant le procédé. A method for making silver nanowires is provided, wherein the recovered silver nanowires have a high aspect ratio; and where the total glycol concentration is <0.001 wt% at any time during the process.

PROCESS FOR MANUFACTURING SILVER NANOWLAS

Un procédé pour fabriquer des nanofils d'argent est fourni, où les nanofils d'argent récupérés ont un rapport d'aspect élevé; et où la concentration en glycols totale est < 0,001 % en poids à tout moment pendant le procédé. A method for making silver nanowires is provided, wherein the recovered silver nanowires have a high aspect ratio; and where the total glycol concentration is <0.001 wt% at any time during the process.

Method for improving the surface finish of additive manufactured articles

An additive elastomeric manufactured part having improved surface finish is made by repeatedly extruding through a nozzle to build up layers of a material comprised of a prepolymer comprised of an isocyanate terminated prepolymer and a filler in an amount such that the material has a shear storage modulus G' of 100,000 to 300,000 Pa measured at an oscillation rate of 1 Hz and a relaxation time of 20 seconds to 360 seconds. It has been discovered that the particular material having these rheological properties is able to improve the surface finish of the additive manufactured part without slumping and is believed to be due to surface flow of material into valleys between the extrudates as they are being built up.

Carbon molecular sieve adsorbent monoliths and methods for making the same

Methods for forming a carbon molecular sieve includes loading polymer fibers into a mold and heating the mold containing the polymer fibers to a temperature in a range from 50 °C to 350 °C to form a polymer monolith. The polymer monolith is then pyrolized by heating to a temperature in a range from 500 °C to 1700 °C. A carbon molecular sieve monolith includes a first end and a second end opposite the first end, and carbon molecular sieve fibers aligned in parallel from the first end of the carbon molecular sieve monolith to the second end of the carbon molecular sieve monolith. Channels extend from the first end of the carbon molecular sieve monolith to the second end of the carbon molecular sieve monolith, and outer surfaces of the carbon molecular sieve fibers are joined. The carbon molecular sieve monolith has a cell density of greater than 500 cells per square inch.

Separation of gases via carbonized vinylidene chloride copolymer gas separation membranes and processes therefor

A process for separating hydrogen from a gas mixture having hydrogen and a larger gas molecule is comprised of flowing the gas mixture through a carbonized polyvinylidene chloride (PVDC) copolymer membrane having a hydrogen permeance in combination with a hydrogen/methane selectivity, wherein the combination of hydrogen permeance and hydrogen/methane selectivity is (i) at least 30 GPU hydrogen permeance and at least 200 hydrogen/methane selectivity or (ii) at least 10 GPU hydrogen permeance and at least 700 hydrogen/methane selectivity. The carbonized PVDC copolymer may be made by heating and restraining a polyvinylidene chloride copolymer film or hollow fiber having a thickness of 1 micrometer to 250 micrometers to a pretreatment temperature of 100° C. to 180° C. to form a pretreated polyvinylidene chloride copolymer film and then heating and restraining the pretreated polyvinylidene chloride copolymer film to a maximum pyrolysis temperature from 350° C. to 750° C.

Composição de precursor de membrana, precursor de membrana, membrana, e, método de formação de um precursor de membrana

composição de precursor de membrana, precursor de membrana, membrana, e, método de formação de um precursor de membrana. trata-se de uma membrana de peneira molecular de carbono (cms) que pode ser vantajosamente produzida por pirólise de uma composição de precursor de membrana composta por um polímero de formação de carbono (por exemplo, poli-imida) mesclado com um copolímero de cloreto de polivinilideno (pvdc), em que o copolímero de cloreto de polivinilideno é o produto de reação de pelo menos 60% a 97% em peso de cloreto de vinilideno e pelo menos um outro comonômero e o polímero de formação de carbono para copolímero de cloreto de polivinilideno tem uma razão em peso maior do que 1 a 99. a composição de precursor de membrana pode ser formada dissolvendo-se o polímero de formação de carbono e pvdc em um solvente para formar uma solução de dopagem. a solução de dopagem pode ser conformada, por exemplo, em uma fibra oca assimétrica. a fibra oca assimétrica pode ser aquecida a uma temperatura para desidrocloração do pvdc e, em seguida, subsequentemente aquecida em uma atmosfera não oxidante para carbonizar os polímeros da membrana conformada para formar a membrana de cms.

Method for improving the surface finish of additive manufactured articles

An additive elastomeric manufactured part having improved surface finish is made by repeatedly extruding through a nozzle to build up layers of a material comprised of a prepolymer comprised of an isocyanate terminated prepolymer and a filler in an amount such that the material has a shear storage modulus G' of 100,000 to 300,000 Pa measured at an oscillation rate of 1 Hz and a relaxation time of 20 seconds to 360 seconds. It has been discovered that the particular material having these rheological properties is able to improve the surface finish of the additive manufactured part without slumping and is believed to be due to surface flow of material into valleys between the extrudates as they are being built up.

Processo para separar hidrogênio de uma mistura gasosa, e, método para fazer um copolímero de cloreto de polivinilideno carbonizado

Um processo para separar hidrogênio de uma mistura gasosa tendo hidrogênio e uma molécula de gás maior é composto de fluxo da mistura gasosa através de uma membrana de copolímero de cloreto de polivinilideno (PVDC) carbonizado tendo uma permeância ao hidrogênio em combinação com uma seletividade de hidrogênio/metano, em que a combinação de a permeância ao hidrogênio e a seletividade de hidrogênio/metano é de (i) pelo menos 30 GPU de permeância ao hidrogênio e pelo menos 200 de seletividade de hidrogênio/metano ou (ii) pelo menos 10 GPU de permeância ao hidrogênio e pelo menos 700 de seletividade de hidrogênio/metano. O copolímero de PVDC carbonizado pode ser feito aquecendo e restringindo um filme de copolímero de cloreto de polivinilideno ou fibra oca com uma espessura de 1 micrômetro a 250 micrômetros até uma temperatura de pré-tratamento de 100°C a 180°C para formar um filme de copolímero de cloreto de polivinilideno pré-tratado e então aquecer e restringir o filme de copolímero de cloreto de polivinilideno pré-tratado a uma temperatura máxima de pirólise de 350°C a 750°C.

Método para fazer um copolímero de cloreto de polivinilideno carbonizado

Um copolímero de PVDC carbonizado útil para a separação de uma olefina da sua parafina correspondente pode ser feito por aquecimento de um filme de copolímero de cloreto de polivinilideno ou fibra oca com uma espessura de 1 micrômetro a 20 micrômetros até uma temperatura de pré-tratamento de 100oC a 180oC para formar um filme de copolímero de cloreto de polivinilideno pré-tratado e depois aquecer o filme de copolímero de cloreto de polivinilideno pré-tratado até uma temperatura máxima de pirólise de 350°C a 750°C. Um processo para separar uma olefina de sua parafina correspondente em uma mistura de gases é composto por escoar a mistura de gás através do copolímero de cloreto de polivinilideno carbonizado (PVDC) acima mencionado para produzir uma primeira corrente de permeado tendo uma concentração aumentada da olefina e uma segunda corrente de retentado tendo uma concentração aumentada da sua parafina correspondente.

Método para produzir uma membrana de peneira molecular de carbono suportada, membrana de peneira molecular de carbono suportada e processo para separar uma molécula de gás de uma alimentação de gás composta pela molécula de gás e por pelo menos uma outra molécula de gás

Trata-se de uma membrana de peneira molecular de carbono suportada (CMS) que é produzida por contato de uma película de um polímero formador de carbono em um têxtil polímero para formar um laminado. O laminado é, então, aquecido a uma temperatura por um tempo sob uma atmosfera suficiente para carbonizar a película e o têxtil de polímero para formar a membrana de CMS suportada. A membrana de CMS suportada formada é um laminado que tem uma camada de separação de carbono ligada graficamente a um têxtil de carbono, em que a camada de separação de carbono é uma película contínua. As membranas de CMS suportadas são particularmente úteis para separar gases, como olefinas, de suas parafinas correspondentes.

A composition and method for forming a carbon molecular sieve membrane produced from a carbon forming polymer-polyvinylidene chloride copolymer blend

Carbon molecular sieve membrane produced from a carbon forming polymer-polyvinylidene chloride copolymer blend

A carbon molecular sieve (CMS) membrane may advantageously be made by pyrolyzing a membrane precursor composition comprised of a carbon forming polymer (e.g., polyimide) blended with a polyvinylidene chloride copolymer (PVDC), the polyvinylidene chloride copolymer being the reaction product of at least 60% to 97% by weight of vinylidene chloride and at least one other comonomer and the carbon forming polymer to polyvinylidene chloride copolymer has a weight ratio of greater than 1 to 99. The membrane precursor composition may be formed by dissolving the carbon forming polymer and PVDC in a solvent to form a dope solution. The dope solution may be shaped, for example, into an asymmetric hollow fiber. The asymmetric hollow fiber may be heated to a temperature to dehydrochorinate the PVDC and then subsequently heated in a non-oxidizing atmosphere to carbonize the polymers of the shaped membrane to form the CMS membrane.

Hydrothermal method for manufacturing silver nanowires

A method for manufacturing high aspect ratio silver nanowires is provided, wherein a total glycol concentration is <0.001 wt % at all times.