JOURNAL OF MEMBRANE SCIENCE
·
2020
·
IF 7.183
Xiaochang Cao,Haoqing Xu,Songlin Dong,Jiayou Xu,Zhihua Qiao,Song Zhao,Jixiao Wang,Zhi Wang
In this work, we proposed a simple method to prepare high-performance and pressure-resistant mixed matrix membranes (MMMs) for CO 2 /H 2 separation. The groups or segments of poly-(vinylamine) (PVAm) were used to modify covalent organic frameworks (COFs), and COFs with similar frameworks but different surfaces were obtained. Then, modified COFs were mixed with PVAm matrix and used to coat the modified-polysulfone (mPSf) to prepare MMMs for CO 2 /H 2 separation. Modified COFs and the PVAm matrix were highly compatible because COF surfaces possessed the same groups or segments as PVAm. Meanwhile, in the coating solution, COF surfaces were found to induce penetration of PVAm molecules into COF pores, narrowing the pore size of the COFs and providing an amino environment for CO 2 preferential absorption and transport. The penetration degree was affected by the hydrogen bond between COF surfaces and the PVAm molecules. In addition, the incorporated COFs effectively restricted the mobility of the PVAm matrix, increasing the pressure resistance for MMMs under high pressure. In the gas permeation test, the optimal MMMs could achieve a CO 2 permeance of 957 GPU and a CO 2 /H 2 selectivity of 17.1 at 2.0 MPa because of the high compatibility and size of the channels (0.94 nm).
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xinyue Chen,Yun Wu,Zhu Long,Dan Zhang,Pengxiang Si
Stiffness change materials have been widely used in soft robots, intelligent adhesives and biomedical minimally invasive devices which can respond to specific stimuli. Compared with stimuli such as light, electricity, magnetism, temperature, and pressure, moisture is a non-toxic, readily available, and inexhaustible triggered source in the atmosphere. However, it is challenging to achieve a stiffness variable material with a large stiffness change using moisture. Traditional sensitive materials usually swell to expand the volume or dissolve to a liquid-like state when absorbing moisture, which is unfavorable for real applications. Herein, we demonstrate a polyvinylamine (PVAm)/polyethylenimine (PEI) composite film with variable stiffness change by moisture absorption and release. PVAm is a semicrystalline polymer with high stiffness and PEI forms intermolecular hydrogen bonding with primary amine groups on PVAm. The synergistic effect of hydrogen bonding and crystallization was maximized when 15 wt % PEI was added to the composite system, resulting in a large stiffness change of up to 7.1 × 104 (0.022 MPa versus 1560.85 MPa) of PVAm/PEI composite film under 25 °C, 95% RH. The crystallinity structure and hydrogen bonding can be broken and reformed by adjusting humidity. As promising variable stiffness polymers, the developed PVAm/PEI composite film is demonstrated as a reconfigurable multitool for shape memory and locking on demand.
研究领域:
材料科学
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智能材料
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xiaofei Cao,Yongzhan Han,Jiankui Zhou,Weiwei Zuo,Xiao Gao,Lifeng Han,Xinchang Pang,Li Zhang,Yingliang Liu,Shaokui Cao
The ON/OFF ratio and long-term stability are two important issues for flexible organic–inorganic hybrid perovskite (OHP) resistive random access memory (RRAM) for practical applications. In this work, polyvinylammonium (PVAm) is applied to partially replace methylamine ions (MA+) to fabricate the stable and flexible polymeric OHP RRAM devices, wherein PVAm acts as nucleation sites and the template for crystalline growth of MAPbI3 to tune the microscopic perovskite structure. Simultaneously, the multiple perovskite grain interfaces are strengthened through the long-carbochain polymeric backbone, hence producing a continuous and compact perovskite film. As a result, the PVAm-modified OHP RRAM device shows remarkable enhancement of the ON/OFF ratio, long-term stability, and flexibility compared with the unmodified OHP device. Specifically, the polymeric OHP device exhibits fast and stable nonvolatile resistive switching (RS) characteristics with an ON/OFF ratio of ∼105 and a set voltage of −0.45 V under ambient conditions. Also, the distinct multilevel RS behavior can be realized in this device by controlling the compliance current in the SET process. Additionally, the unsealed polymeric OHP device manifests the striking long-term stability, which can still maintain the stable memory performance after 1 year exposure to the humid and thermal ambient environment. Furthermore, the flexible polymeric OHP device was also fabricated and affords the excellent bending endurance behavior by showing a reproducible RS property over 100-cycle bending experiments. This work provides a new perovskite-based material design strategy of polymeric OHP for stable and flexible RRAM devices with the high ON/OFF ratio.
研究领域:
材料科学
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电子工程
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产品关联
DOI
PubMed
高影响因子
Journal of Natural Gas Science and Engineering
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2021
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IF 4.965
Xiangyu Cai,Ye Yuan,Menglong Sheng,Jixiao Wang,Zhi Wang
The polyvinylamine (PVAm) was respectively modified by the MOFs (IRMOF-3 and ZIF-8) with amine groups that were characterized by TEM, SEM and XRD . The PVAm-MOFs/polysulfone (mPSf) mixed matrix membranes (MMMs) were fabricated by coating different PVAm-MOFs mixtures on mPSf ultrafiltration membranes. The performance of the PVAm-MOFs/mPSf and PVAm/mPSf membranes for CO 2 /CH 4 separation was investigated. Compared with the PVAm/mPSf virgin membrane, PVAm-MOFs/mPSf MMMs display higher CO 2 separation performance due to the decreased membrane effective thickness and incorporation of amine-rich nanochannels. Furthermore, compared with PVAm-ZIF-8/mPSf MMM, the PVAm-IRMOF-3/mPSf MMM possesses higher CO 2 /CH 4 separation performance. Then the CO 2 /CH 4 separation performance of the PVAm-IRMOF-3/mPSf MMMs with different IRMOF-3 loadings was studied. Compared with other reported membranes, the PVAm-IRMOF-3/mPSf MMM loaded 25 wt% IRMOF-3 shows higher CO 2 /CH 4 separation performance at both low and high feed pressure.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Xiaochang Cao,Zhi Wang,Zhihua Qiao,Song Zhao,Jixiao Wang
Developing mixed matrix membranes (MMMs) is challenging because the interface between different matrices often forms undesirable structures. Herein, we demonstrate a method of creating suitable CO2-selective channels based on interface regulation that greatly enhances membrane separation performance. The poly(vinylamine), which also acts as a polymer matrix, was immobilized onto covalent organic frameworks (COFs) to obtain polymer–COF hybrid materials (COFp). The COFp and polymer matrix are highly compatible because they have the same segment. The polymer matrix was induced to penetrate the oversized COFp, resulting in an amino-environmental pore wall and appropriately sized CO2-selective channels dispersed in MMMs. The MMMs exhibited satisfactory membrane performance for CO2/N2, CO2/CH4, and CO2/H2 separation. A CO2 transport model for preferential adsorption and transport is clearly presented for the first time. The membrane separation mechanism is also discussed. This work demonstrates potential applications for material, interface, and membrane investigations.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
DOI
高影响因子
RSC Advances
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2013
·Vol. 3
·期 45
·22994-23000
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IF 2.562
Wei Huang,Xueqin Wang,Yongtang Jia,Xiaoqi Li,Zhigao Zhu,Yan Li,Yang Si,Bin Ding,Xueli Wang,Jianyong Yu
A novel, sensitive, selective, and reproductive formaldehyde sensor has been developed by coating polyvinylamine (PVAm) modified electrospun polyacrylonitrile (PAN) nanofibrous membranes on quartz crystal microbalance (QCM) for the first time. Benefiting from the abundant primary amine groups in PVAm, large specific surface area, high porosity and hierarchal structure of PAN nanofibers, and the strong interaction between PVAm molecule and formaldehyde, the as-prepared QCM sensors achieved an extremely low detection limit of 500 ppb in a remarkably short period of time (120 s). Moreover, the sensitivity of the fibrous membranes based sensors are 2.5 times higher than that of flat film-based ones when upon exposure to 500 ppb formaldehyde. Furthermore, the as-prepared QCM sensors possess excellent reproducibility, reversibility, and good selectivity by virtue of the reversible nucleophilic addition reaction between formaldehyde molecule and primary amine group in PVAm. Hence, such promising QCM sensors could not only potentially allow for monitoring gaseous formaldehyde, but also pave a way for designing and development of novel QCM sensing systems based on functionalized nanofibrous membranes.
研究领域:
材料科学
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环境监测
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化学传感器
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2023
·
IF 4.2
Yang Li,Mingyuan Li,Zhihong Lin,Moris S. Eisen,Dario R. Dekel,Xuezhong He
An ultrathin amine-rich selective layer comprising the fixed-site carrier from polyvinylamine (PVAm) and the mobile carrier with an amino acid salt was successfully coated on top of the polysulfone (PSf) substrate for enhanced CO2-facilitated transport. PVAm with an ultrahigh molecular weight was synthesized via the inverse emulsion polymerization method, which allows the excellent dissipation of the reaction heat and reduces gel formation drastically. Several batches of PVAm with different hydrolysis degrees and molecular weights were successfully synthesized. The mobile carriers of 2-(1-piperazinyl)ethylamine salts of sarcosine (PZEA-Sar) were synthesized and introduced to strengthen the facilitated transport contribution, while cellulose nanocrystals (CNCs) were incorporated into the polymer matrix to enhance the mechanical strength and also increase the free volume of the polymer matrix. The amine-rich composite membranes made from 0.5 wt % PVAm/PZEA-Sar-0.5 wt % CNC with a high-molecular-weight PVAm of 4.4 MDa at a degree of hydrolysis (DOH) of 78% demonstrate a significantly enhanced CO2 permeance of 160 GPU with a good CO2/N2 selectivity of 48 at 35 °C and a feed pressure of 2 bar. The developed amine-rich facilitated transport membrane shows excellent potential for industrial carbon capture.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2016
·
IF 5.557
Yupeng He,Zhi Wang,Songlin Dong,Song Zhao,Zhihua Qiao,Xiaochang Cao,Jixiao Wang,Shichang Wang
Improvement of the performance of CO 2 separation membrane under high temperature is of great importance in industrial applications. In this work, 2-aminoterephthalic acid (AA) was used to chemically cross-link polyvinylamine (PVAm) to fabricate PVAm-AA aqueous solution. PVAm-AA/polysulfone(PSf) composite membrane was then prepared by coating PVAm-AA aqueous solution on PSf support membrane. Through the chemical cross-linking by AA, the polymer chain mobility was restrained, resulting in the enhancement of thermal stability. The introduction of AA also increased the effective carrier content for CO 2 separation. Therefore, CO 2 permeance and CO 2 /gas selectivity of PVAm-AA/PSf membrane under relatively high temperature were greatly improved. For CO 2 /N 2 mixed gas (15/85 by volume), PVAm-AA/PSf membrane showed a CO 2 permeance of 661 Gas Permeation Unit (GPU) and CO 2 /N 2 selectivity of 95 at 0.3 MPa and 120 °C. Excellent performance stability was shown during the operation for 250 h at 120 °C. Moreover, PVAm-AA/PSf membrane displayed excellent separation performance and thermal stability for the separation of CO 2 /CH 4 and CO 2 /H 2 mixed gases.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2011
·
IF 3.673
Shuangjie Yuan,Zhi Wang,Zhihua Qiao,Mingming Wang,Jixiao Wang,Shichang Wang
In this work, the idea of modifying the fixed carrier membrane for CO 2 separation by a cross-linking agent containing carriers to simultaneously improve the CO 2 -induced plasticization resistance, the CO 2 permeance and the CO 2 /N 2 selectivity of the membrane was suggested and confirmed. Polyvinylamine (PVAm), a polymer to prepare fixed carrier membrane for CO 2 separation, was synthesized by partial acidic hydrolysis of poly(N-vinylformamide) and further modified by using ethylenediamine (EDA). Elemental analysis, ATR-FTIR, XPS and XRD were employed to characterize the EDA modified PVAm. The result of ATR-FTIR and XPS showed that the EDA can effectively cross-link PVAm by the hydrogen bonds formed between amine groups of EDA and either amine or amide groups in PVAm. The composite membranes were developed by coating the PVAm–EDA mixed solutions with different mass ratio of EDA/PVAm ( m EDA / m PVAm ) on polysulfone (PS) ultrafiltration membrane. The effects of m EDA / m PVAm in coating solution and wet coating thickness on the gas performance of the PVAm–EDA/PS composite membranes were investigated. The PVAm–EDA/PS membrane prepared by using coating solution with proper m EDA / m PVAm (from 1 to 3) showed higher CO 2 permeance and much higher CO 2 /N 2 selectivity as well as better CO 2 -induced plasticization resistance than that of the PVAm/PS membrane. It is attributed to two factors: (1) the densification of polymer matrix by moderate hydrogen bond cross-linking; and (2) the increase of total carrier content in membrane. As CO 2 -induced plasticization resistance improves, the selective layer thickness of the PVAm–EDA/PS membrane can be further reduced to obtain a higher CO 2 permeance and a proper CO 2 /N 2 selectivity simultaneously. For CO 2 /N 2 gas mixture (20/80 by volume), the PVAm–EDA/PS membrane prepared by using coating solution with m EDA / m PVAm of 3 and 50 μm wet coating thickness displayed a CO 2 permeance of 607 GPU and CO 2 /N 2 selectivity of 106 at CO 2 partial pressure of 0.02 MPa. The separation performance stability of the PVAm–EDA/PS membranes was investigated for 300 h and no deterioration in membrane permselectivity was observed. Moreover, the PVAm–EDA/PS membrane had no obvious degradation after exposure to H 2 O-saturated SO 2 of 300,000 ppm h.
研究领域:
高分子科学
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气体分离
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膜技术
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材料化学
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环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2020
·
IF 7.183
Ye Yuan,Zhihua Qiao,Jiayou Xu,Jixiao Wang,Song Zhao,Xingzhong Cao,Zhi Wang,Michael D. Guiver
Membrane-based separation processes can improve separation efficiency and reduce the environmental hazards and energy costs of traditional separation processes. Mixed matrix membranes (MMMs) with broad development prospects are frequently restricted by interfacial incompatibility and the blockage of gas transport channels in the filler matrix. Here, we report a new type of high-valence metal-induced microporous polymer (HMMP-1) filler, with a high density of free amine groups, and having excellent alkaline stability. The HMMP-1 nanoparticles were incorporated into polyvinylamine (PVAm) to prepare facilitated transport mixed matrix membranes (MMMs). The resulting HMMP-1 based MMMs maintain their pore aperture structure, which is mainly due to the excellent compatibility between the polymer component in the HMMP-1 and PVAm. Amine-rich nanochannels with appropriate pore size allow rapid CO 2 transport through the filler pores by preferential adsorption monomolecular surface diffusion , leading to high CO 2 permeance and excellent separation performance for CO 2 /CH 4 , CO 2 /N 2 and CO 2 /H 2 compared with many other reported membranes. A techno-economic evaluation suggests that the MMM is feasible for carbon capture from post-combustion flue gas .
研究领域:
材料科学
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环境工程
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化学工程
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产品关联
DOI
高影响因子
POLYMER INTERNATIONAL
·
2022
·Vol. 71
·期 8
·1022-1029
·
IF 3.213
Mei Lin,Aizhu Lin,Sheng Huang,Tianhui Liu,Fang Ke,Deshun Qiu,Xuefeng Lin,Daoshu Luo
An ideal carrier that delivers small interfering RNA (siRNA) should be designed based on two criteria: high gene transfection efficiency and low cytotoxicity. In this work, arginine was used to modify polyvinylamine (PVAm) to form a novel PVAm derivative (PVAm-Arg) for siRNA delivery and the derivative was characterized using Fourier transform infrared spectroscopy. PVAm-Arg/siRNA complexes were formed by the self-assembly method. The zeta potential and size of the complexes were measured using electrophoretic light scattering and dynamic light scattering, respectively. The siRNA binding capacity of PVAm-Arg was assessed using gel retardation assay. The results showed that PVAm-Arg derivatives can bind siRNA effectively and form complexes with sizes of about 72 ± 2 nm. What is more, the ability of PVAm-Arg to condense siRNA was better than that of PVAm. Cytotoxicity assay with RSC96 cells also showed that PVAm-Arg had lower cytotoxicity compared with PVAm. In in vitro cellular uptake assay, PVAm-Arg showed good transfection efficiency. Therefore, we concluded that PVAm-Arg would be a promising candidate as a gene delivery vector. © 2022 Society of Industrial Chemistry.
研究领域:
生物技术
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药学
·
分子生物学
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产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2025
·
IF 4.7
Rou Wen,Qingqing Ye,Qi Wang,Xu Li,Dongfang Guo,Lianbo Liu,Shiwang Gao,Liqiang Luo,Achao Chen,Tong Wu,Meiling Dou
The development of high-efficiency CO 2 separation membranes represents a critical pathway toward achieving the goal of carbon neutrality. In this work, we present a size-controlled strategy to fabricate a high-performance mixed matrix membrane (MMM) using poly (vinylamine) (PVAm) matrices incorporated with zeolitic imidazolate framework (ZIF-8) filler (size range: 98-1200 nm). Systematic investigation reveals that ZIF-8 particle size critically governs interfacial compatibility with the PVAm matrix, directly impacting CO 2 separation efficiency. Both significantly larger or smaller particles than 130 nm tend to induce non-selective interfacial voids at the polymer-filler interface. Optimal performance is achieved with 130 nm ZIF-8 fillers, which exhibits superior dispersion stability in PVAm solutions, as evidenced by the highest zeta potential values. The resultant MMM exhibits high separation performance under 0.1 MPa feed pressure, achieving a CO 2 permeability of 455.06 GPU and CO 2 /N 2 selectivity of 42.36, higher than those of the pure PVAm-based membrane without ZIF-8 filler. This work provides valuable guidance for the design of high-performance CO 2 separation membranes, advancing the development of sustainable carbon management technologies.
研究领域:
材料科学
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化学工程
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环境科学
·
膜技术
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碳捕集
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）