Patents by Inventor Gongping Liu
Gongping Liu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11969697Abstract: The present disclosure relates to a phenyl-modified polydimethylsiloxane (PDMS) separation membrane, a fabrication method thereof, and a use thereof in the separation of an aromatic compound, and belongs to the technical field of separation membrane materials. A phenyl-modified PDMS separation membrane comprising a substrate layer and a selective layer is provided.Type: GrantFiled: October 21, 2022Date of Patent: April 30, 2024Assignee: NANJING TECH UNIVERSITYInventors: Gongping Liu, Yang Pan, Wanqin Jin, Haipeng Zhu
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Patent number: 11971340Abstract: The present disclosure provides a method for predicting a lattice defect in a metal-organic framework (MOF) membrane. The method comprises acquiring a number n of a ligand during preparation of the MOF membrane, and acquiring a theoretical number m of connections formed between a core secondary building unit and a surrounding secondary building unit; setting a number of collisions of the ligand with the core secondary building unit and the surrounding secondary building unit; and calculating an expected value of a number of connections formed on lattices based on a collision probability, wherein the number of collisions is 1 or 2.Type: GrantFiled: October 31, 2023Date of Patent: April 30, 2024Assignee: NANJING TECH UNIVERSITYInventors: Gongping Liu, Guozhen Liu, Wanqin Jin
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Publication number: 20240123412Abstract: The present disclosure relates to a polyether block polyamide/polydimethylsiloxane (PDMS) composite membrane for gas separation, and a preparation method and use thereof, and belongs to the technical field of membrane separation. In the present disclosure, an amphoteric copolymer PDMS-polyethylene oxide (PEO) (PDMS-b-PEO) is introduced into an intermediate layer to adjust the interfacial binding performance, thereby promoting preparation of an ultra-thin polyether block polyamide composite membrane. Studies have shown that the surface enrichment of PEO segments not only inhibits a dense SiOx layer formed due to a plasma treatment of a PDMS intermediate layer, but also provides additional hydrophilic sites and interfacial compatibility for the subsequent selective layer. The use of PDMS-b-PEO in an intermediate layer allows the successful preparation of a selective layer with a thickness of about 50 nm.Type: ApplicationFiled: June 20, 2023Publication date: April 18, 2024Applicant: NANJING TECH UNIVERSITYInventors: Gongping LIU, Jiangying LIU, Wanqin JIN, Yang PAN
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Patent number: 11951446Abstract: The present disclosure provides an acryloyloxy-terminated polydimethylsiloxane (AC-PDMS)-based thin-film composite (TFC) membrane, and a preparation method and use thereof. In the preparation method, a simple ultraviolet (UV)-induced monomer polymerization strategy based on high UV reactivity among acryloyloxy groups is adopted to prepare the AC-PDMS-based TFC membrane. The high UV reactivity among AC-PDMS monomers can induce the rapid curing of a casting solution to enable the formation of an ultra-thin selective layer and the inhibition of pore penetration for a substrate. By optimizing a UV wavelength, an irradiation time, and a polymer concentration, the prepared AC-PDMS-based TFC membrane has a CO2 penetration rate of 9,635 GPU and a CO2/N2 selectivity of 11.5. The UV-induced monomer polymerization strategy based on material properties provides a novel efficient strategy for preparing an ultra-thin PDMS-based membrane, which can be used for molecular separation.Type: GrantFiled: June 12, 2023Date of Patent: April 9, 2024Assignee: NANJING TECH UNIVERSITYInventors: Gongping Liu, Yang Pan, Wanqin Jin
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Patent number: 11944942Abstract: The present disclosure relates to a polyether block polyamide/polydimethylsiloxane (PDMS) composite membrane for gas separation, and a preparation method and use thereof, and belongs to the technical field of membrane separation. In the present disclosure, an amphoteric copolymer PDMS-polyethylene oxide (PEO) (PDMS-b-PEO) is introduced into an intermediate layer to adjust the interfacial binding performance, thereby promoting preparation of an ultra-thin polyether block polyamide composite membrane. Studies have shown that the surface enrichment of PEO segments not only inhibits a dense SiOx layer formed due to a plasma treatment of a PDMS intermediate layer, but also provides additional hydrophilic sites and interfacial compatibility for the subsequent selective layer. The use of PDMS-b-PEO in an intermediate layer allows the successful preparation of a selective layer with a thickness of about 50 nm.Type: GrantFiled: June 20, 2023Date of Patent: April 2, 2024Assignee: NANJING TECH UNIVERSITYInventors: Gongping Liu, Jiangying Liu, Wanqin Jin, Yang Pan
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Patent number: 11878267Abstract: M(SiF6)(pyz)3 (M=Cu, Zn, Co, or Ni) has a pore size between a size of H2 and a size of CO2, and thus exhibits prominent screening performance for H2/CO2. A strong interaction between Cu(SiF6)(bpy)2 and a CO2 molecule can hinder the transport of the CO2 molecule. The above two MOFs both can achieve the H2/CO2 separation. By preparing a dense MSiF6/polymer layer, MSiF6 is uniformly dispersed in the polymer and is fixed, and subsequently, MSiF6 is converted into M(SiF6)(pyz)3 or Cu(SiF6)(bpy)2 by interacting with an organic ligand. Through vapor-induced in-situ conversion, MOF particles can be well dispersed without interface defects between the MOF particles and the polymer. Even at a doping amount of 80%, the mechanical flexibility and stability of the MMM can still be retained.Type: GrantFiled: February 6, 2023Date of Patent: January 23, 2024Assignee: NANJING TECH UNIVERSITYInventors: Gongping Liu, Guining Chen, Wanqin Jin
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Publication number: 20230398504Abstract: The present disclosure provides an acryloyloxy-terminated polydimethylsiloxane (AC-PDMS)-based thin-film composite (TFC) membrane, and a preparation method and use thereof. In the preparation method, a simple ultraviolet (UV)-induced monomer polymerization strategy based on high UV reactivity among acryloyloxy groups is adopted to prepare the AC-PDMS-based TFC membrane. The high UV reactivity among AC-PDMS monomers can induce the rapid curing of a casting solution to enable the formation of an ultra-thin selective layer and the inhibition of pore penetration for a substrate. By optimizing a UV wavelength, an irradiation time, and a polymer concentration, the prepared AC-PDMS-based TFC membrane has a CO2 penetration rate of 9,635 GPU and a CO2/N2 selectivity of 11.5. The UV-induced monomer polymerization strategy based on material properties provides a novel efficient strategy for preparing an ultra-thin PDMS-based membrane, which can be used for molecular separation.Type: ApplicationFiled: June 12, 2023Publication date: December 14, 2023Applicant: NANJING TECH UNIVERSITYInventors: Gongping LIU, Yang PAN, Wanqin JIN
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Publication number: 20230294070Abstract: The present disclosure relates to a mixed matrix carbon molecular sieve (CMS) membrane, a preparation method of the mixed matrix CMS membrane, and use of the mixed matrix CMS membrane in C2H4/C2H6 separation, and belongs to the technical field of membrane separation. The present disclosure solves the problem that the CMS materials in the prior art exhibit low selectivity and low flux during an ethylene/ethane separation process. In this patent, C3N4 is used as a filling particle to prepare a mixed matrix membrane (MMM), and the MMM is pyrolyzed to prepare a CMS membrane. The C3N4/6FDA-DAM MMM has prominent C2 separation performance.Type: ApplicationFiled: February 6, 2023Publication date: September 21, 2023Applicant: NANJING TECH UNIVERSITYInventors: Gongping LIU, Guozhen LIU, Renhao LI, Long CHENG, Wanqin JIN
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Patent number: 11759763Abstract: The present disclosure relates to a mixed matrix carbon molecular sieve (CMS) membrane, a preparation method of the mixed matrix CMS membrane, and use of the mixed matrix CMS membrane in C2H4/C2H6 separation, and belongs to the technical field of membrane separation. The present disclosure solves the problem that the CMS materials in the prior art exhibit low selectivity and low flux during an ethylene/ethane separation process. In this patent, C3N4 is used as a filling particle to prepare a mixed matrix membrane (MMM), and the MMM is pyrolyzed to prepare a CMS membrane. The C3N4/6FDA-DAM MMM has prominent C2 separation performance.Type: GrantFiled: February 6, 2023Date of Patent: September 19, 2023Assignee: NANJING TECH UNIVERSITYInventors: Gongping Liu, Guozhen Liu, Renhao Li, Long Cheng, Wanqin Jin
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Publication number: 20230277979Abstract: M(SiF6)(pyz)3 (M=Cu, Zn, Co, or Ni) has a pore size between a size of H2 and a size of CO2, and thus exhibits prominent screening performance for H2/CO2. A strong interaction between Cu(SiF6)(bpy)2 and a CO2 molecule can hinder the transport of the CO2 molecule. The above two MOFs both can achieve the H2/CO2 separation. By preparing a dense MSiF6/polymer layer, MSiF6 is uniformly dispersed in the polymer and is fixed, and subsequently, MSiF6 is converted into M(SiF6)(pyz)3 or Cu(SiF6)(bpy)2 by interacting with an organic ligand. Through vapor-induced in-situ conversion, MOF particles can be well dispersed without interface defects between the MOF particles and the polymer. Even at a doping amount of 80%, the mechanical flexibility and stability of the MMM can still be retained.Type: ApplicationFiled: February 6, 2023Publication date: September 7, 2023Applicant: NANJING TECH UNIVERSITYInventors: Gongping LIU, Guining CHEN, Wanqin JIN
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Publication number: 20230129752Abstract: The present disclosure relates to a phenyl-modified polydimethylsiloxane (PDMS) separation membrane, a fabrication method thereof, and a use thereof in the separation of an aromatic compound, and belongs to the technical field of separation membrane materials. A phenyl-modified PDMS separation membrane comprising a substrate layer and a selective layer is provided.Type: ApplicationFiled: October 21, 2022Publication date: April 27, 2023Applicant: NANJING TECH UNIVERSITYInventors: Gongping LIU, Yang PAN, Wanqin JIN, Haipeng ZHU
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Patent number: 10294459Abstract: This disclosure provides isolated infectious polynucleotides, such as infectious clones, having a nucleotide sequence with identity to PRRS viruses such as VR-2332, Lelystad, or others, and optionally further including a deletion in a region of ORF1 that encodes the nsp2 polypeptide.Type: GrantFiled: July 8, 2015Date of Patent: May 21, 2019Assignee: Regents of the University of MinnesotaInventors: Kay Faaberg, Jun Han, Gongping Liu, Yue Wang
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Publication number: 20170266623Abstract: A method for preparing a graphene composite membrane on the surface of a tubular support. In the method, a tubular ceramic membrane is used as the support, a layer of graphene material is uniformly prepared on the surface of the support by vacuum suction, and the defect-free tubular graphene composite membrane is obtained by the drying process.Type: ApplicationFiled: August 27, 2015Publication date: September 21, 2017Inventors: Wanqin JIN, Kang HUANG, Gongping LIU
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Patent number: 9718923Abstract: One method as described herein relates to making a high molecular weight, monoesterified polyimide polymer using a small amount of bulky diamine. These high molecular weight, monoesterified polyimide polymers are useful in forming crosslinked polymer membranes with high permeance that are useful for the separation of fluid mixtures. Another method as described herein relates to making the crosslinked membranes from the high molecular weight, monoesterified polyimide polymer containing a small amount of bulky diamine. The small amount of bulky diamine allows for formation of both the high molecular weight polyimide polymer and for covalent ester crosslinks via reaction of the carboxylic acid groups with a diol crosslinking agent. This small amount of bulky diamines reduces chain mobility or segmental motion during crosslinking and reduces large loss of permeance. As such, this method provides a crosslinked membrane with good permeance and selectivity.Type: GrantFiled: December 23, 2015Date of Patent: August 1, 2017Assignees: Chevron U.S.A. Inc., Georgia Tech Research CorporationInventors: Stephen Joseph Miller, William John Koros, Nanwen Li, Gongping Liu
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Patent number: 9718032Abstract: One method as described herein relates to making a membrane comprising an uncrosslinked high molecular weight, monoesterified polyimide polymer with a small amount of bulky diamine. These uncrosslinked high molecular weight, monoesterified polyimide polymers with a small amount of bulky diamine are useful in forming polymer membranes with high permeance and good selectivity that are useful for the separation of fluid mixtures. Also as described herein is a hollow fiber polymer membrane comprising an uncrosslinked high molecular weight, monoesterified polyimide polymer with a small amount of bulky diamine. The small amount of bulky diamine allows for formation of a membrane comprising the uncrosslinked polymer that exhibits high permeance and good selectivity.Type: GrantFiled: April 7, 2016Date of Patent: August 1, 2017Assignees: Chevron U.S.A. Inc., Georgia Tech Research CorporationInventors: Stephen Joseph Miller, William John Koros, Nanwen Li, Gongping Liu
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Patent number: 9718033Abstract: One method as described herein relates to making a membrane comprising an uncrosslinked high molecular weight polyimide polymer with a small amount of bulky diamine. Also as described herein is a hollow fiber polymer membrane comprising an uncrosslinked high molecular weight polyimide polymer with a small amount of bulky diamine. The polyimide polymers include monomers comprising dianhydride monomers, diamino monomers without carboxylic acid functional groups, and optionally diamino monomers with carboxylic acid functional groups, wherein 2 to 10 mole % of the diamino monomers are bulky diamino compounds and the ratio of diamino monomers with carboxylic acid functional groups to diamino monomers without carboxylic acid functional groups is 0 to 2:3. These uncrosslinked high molecular weight polyimide polymers with a small amount of bulky diamine are useful in forming polymer membranes with high permeance and good selectivity that are useful for the separation of fluid mixtures.Type: GrantFiled: April 7, 2016Date of Patent: August 1, 2017Assignees: Chevron U.S.A. Inc., Georgia Tech Research CorporationInventors: Stephen Joseph Miller, William John Koros, Nanwen Li, Gongping Liu
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Publication number: 20170130207Abstract: This disclosure provides isolated infectious polynucleotides, such as infectious clones, having a nucleotide sequence with identity to PRRS viruses such as VR-2332, Lelystad, or others, and optionally further including a deletion in a region of ORF1 that encodes the nsp2 polypeptide.Type: ApplicationFiled: July 8, 2015Publication date: May 11, 2017Inventors: Kay Faaberg, Jun Han, Gongping Liu, Yue Wang
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Publication number: 20160214066Abstract: One method as described herein relates to making a membrane comprising an uncrosslinked high molecular weight, monoesterified polyimide polymer with a small amount of bulky diamine. These uncrosslinked high molecular weight, monoesterified polyimide polymers with a small amount of bulky diamine are useful in forming polymer membranes with high permeance and good selectivity that are useful for the separation of fluid mixtures. Also as described herein is a hollow fiber polymer membrane comprising an uncrosslinked high molecular weight, monoesterified polyimide polymer with a small amount of bulky diamine. The small amount of bulky diamine allows for formation of a membrane comprising the uncrosslinked polymer that exhibits high permeance and good selectivity.Type: ApplicationFiled: April 7, 2016Publication date: July 28, 2016Applicants: Chevron U.S.A. Inc., Georgia Tech Research CorporationInventors: Stephen Joseph MILLER, William John KOROS, Nanwen LI, Gongping LIU
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Publication number: 20160214067Abstract: One method as described herein relates to making a membrane comprising an uncrosslinked high molecular weight polyimide polymer with a small amount of bulky diamine. Also as described herein is a hollow fiber polymer membrane comprising an uncrosslinked high molecular weight polyimide polymer with a small amount of bulky diamine. The polyimide polymers include monomers comprising dianhydride monomers, diamino monomers without carboxylic acid functional groups, and optionally diamino monomers with carboxylic acid functional groups, wherein 2 to 10 mole % of the diamino monomers are bulky diamino compounds and the ratio of diamino monomers with carboxylic acid functional groups to diamino monomers without carboxylic acid functional groups is 0 to 2:3. These uncrosslinked high molecular weight polyimide polymers with a small amount of bulky diamine are useful in forming polymer membranes with high permeance and good selectivity that are useful for the separation of fluid mixtures.Type: ApplicationFiled: April 7, 2016Publication date: July 28, 2016Applicants: Chevron U.S.A. Inc., Georgia Tech Research CorporationInventors: Stephen Joseph MILLER, William John KOROS, Nanwen LI, Gongping LIU
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Publication number: 20160177034Abstract: One method as described herein relates to making a high molecular weight, monoesterified polyimide polymer using a small amount of bulky diamine. These high molecular weight, monoesterified polyimide polymers are useful in forming crosslinked polymer membranes with high permeance that are useful for the separation of fluid mixtures. Another method as described herein relates to making the crosslinked membranes from the high molecular weight, monoesterified polyimide polymer containing a small amount of bulky diamine. The small amount of bulky diamine allows for formation of both the high molecular weight polyimide polymer and for covalent ester crosslinks via reaction of the carboxylic acid groups with a diol crosslinking agent. This small amount of bulky diamines reduces chain mobility or segmental motion during crosslinking and reduces large loss of permeance. As such, this method provides a crosslinked membrane with good permeance and selectivity.Type: ApplicationFiled: December 23, 2015Publication date: June 23, 2016Applicants: Chevron U.S.A. Inc., Georgia Tech Research CorporationInventors: Stephen Joseph Miller, William John Koros, Nanwen Li, Gongping Liu