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期刊论文 9

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CCS 1

CO2分离 1

四极杆质谱仪 1

气体渗透 1

水蒸气渗透 1

沼气处理 1

膜组件 1

薄膜复合膜 1

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Porous ultrathin-shell microcapsules designed by microfluidics for selective permeation and stimuli-triggered

《化学科学与工程前沿（英文）》   页码 1643-1650 doi: 10.1007/s11705-022-2201-z

摘要： Microcapsules are versatile delivery vehicles and widely used in various areas. Generally, microcapsules with solid shells lack selective permeation and only exhibit a simple release mode. Here, we use ultrathin-shell water-in-oil-in-water double emulsions as templates and design porous ultrathin-shell microcapsules for selective permeation and multiple stimuli-triggered release. After preparation of double emulsions by microfluidic devices, negatively charged shellac nanoparticles dispersed in the inner water core electrostatically complex with positively charged telechelic α,ω-diamino functionalized polydimethylsiloxane polymers dissolved in the middle oil shell at the water/oil interface, thus forming a porous shell of shellac nanoparticles cross-linked by telechelic polymers. Subsequently, the double emulsions become porous microcapsules upon evaporation of the middle oil phase. The porous ultrathin-shell microcapsules exhibit excellent properties, including tunable size, selective permeation and stimuli-triggered release. Small molecules or particles can diffuse across the shell, while large molecules or particles are encapsulated in the core, and release of the encapsulated cargos can be triggered by osmotic shock or a pH change. Due to their unique performance, porous ultrathin-shell microcapsules present promising platforms for various applications, such as drug delivery.

关键词： microcapsule     emulsion     microfluidics     selective permeation     stimuli-triggered release    

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ethylene-co-vinyl alcohol) molecular weight and vinyl alcohol content on morphology, antifouling, and permeation

《化学科学与工程前沿（英文）》 2023年 第17卷 第10期   页码 1484-1502 doi: 10.1007/s11705-023-2331-y

摘要： Various hydrophilic poly(ethylene-co-vinyl alcohol) (EVOH) were used herein to precisely control the structure and hydrodynamic properties of polysulfone (PSF) membranes. Particularly, to prepare pristine PSF and PSF/EVOH blends with increasing vinyl alcohol (VOH: 73%, 68%, 56%), the non-solvent-induced phase separation (NIPS) technique was used. Polyethylene glycol was used as a compatibilizer and as a porogen in N,N-dimethylacetamide. Rheological and ultrasonic separation kinetic measurements were also carried out to develop an ultrafiltration membrane mechanism. The extracted membrane properties and filtration capabilities were systematically compared to the proposed mechanism. Accordingly, the addition of EVOH led to an increase in the rheology of the dopes. The resulting membranes exhibited a microporous structure, while the finger-like structures became more evident with increasing VOH content. The PSF/EVOH behavior was changed from immediate to delayed segregation due to a change in the hydrodynamic kinetics. Interestingly, the PSF/EVOH32 membranes showed high hydrophilicity and achieved a pure water permeability of 264 L·m–2·h–1·bar–1, which was higher than that of pure PSF membranes (171 L·m–2·h–1·bar–1). In addition, PSF/EVOH32 rejected bovine serum albumin at a high rate (> 90%) and achieved a significant restoration of permeability. Finally, from the thermodynamic and hydrodynamic results, valuable insights into the selection of hydrophilic copolymers were provided to tailor the membrane structure while improving both the permeability and antifouling performance.

关键词： polysulfone     blend modification     ultrafiltration membrane     formation hydrodynamics     poly(ethylene-co-vinyl alcohol) copolymer    

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用于灵敏快速测量超阻隔渗透的预测仪器 Article

完颜剑峰, 曹坤, 陈志平, 李云, 刘晨曦, 吴润卿, 张晓东, 陈蓉

《工程（英文）》 2021年 第7卷 第10期   页码 1461-1470 doi: 10.1016/j.eng.2021.02.017

摘要：

测量柔性有机显示器件对水蒸气的高阻隔性，是确保其可靠性所面临的重大工程挑战。一方面，目前缺少10-6 g·m-2·d-1量级的水渗透率测试手段；另一方面，目前也没有标准的超阻隔样品用于渗透率测量的校准。为了对渗透过超阻隔材料的痕量水蒸气流量进行高灵敏、短周期测量，本文将渗透模型集成至基于渗透分子动态积累、检测和抽空的高灵敏质谱测量中，从而开发出了一种具有预测功能的测量仪器。通过使用标准聚合物样品进行校准，确保了测量结果的可靠性。校准后的水蒸气渗透检测下限在10-7g·m-2·d-1量级，满足超阻隔渗透的测量灵敏度要求。本文利用渗透实验数据对所开发的预测渗透模型进行了测试评估，使得利用非稳态数据预测稳态渗透率成为可能，实现在更短的时间内有效开展超阻隔测量。

关键词： 水蒸气渗透     超阻隔     预测模型     四极杆质谱仪    

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Effect of PEG additives on properties and morphologies of polyetherimide membranes prepared by phase inversion

Jian CHEN, Jiding LI, Xia ZHAN, Xiaolong HAN, Cuixian CHEN,

《化学科学与工程前沿（英文）》 2010年 第4卷 第3期   页码 300-306 doi: 10.1007/s11705-009-0280-8

摘要： This study investigated the effect of poly(ethylene glycol) (PEG) additive as a pore-former on the structure formation of membranes and their permeation properties connected with the changes in thermodynamic and kinetic properties in the phase inversion process. The membranes were prepared by using polyetherimide/-methyl-2-pyrrolidone/PEG (PEI/NMP/PEG) casting solution and water coagulant. The resulting membranes, prepared by changing the ratio of PEG to PEI, were characterized by scanning electron microscope (SEM) observations, measurements of water flux and -globin rejection. The thermodynamic and kinetic properties of the membrane-forming system were studied through viscosity. The pore radius distribution curves were especially obtained by differential scanning calorimetry (DSC). Furthermore, the membranes were characterized for pure water flux and rejection of solute and by SEM observation. The filtration results agreed well with the SEM observations. As expected, PEG with a fixed molecular weight (PEG 600) acted as a pore forming agent, and membrane porosity increased as the PEG content of the casting solution increased.

关键词： permeation     ethylene     filtration     PEI/NMP/PEG     membrane    

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Preparation and permeability of ZSM-35 zeolite membranes on porous stainless steel tubes

ZHU Gang, WANG Jinqu, ZHANG Yan, LU Jinming, XIU Jinghai

《化学科学与工程前沿（英文）》 2007年 第1卷 第3期   页码 217-220 doi: 10.1007/s11705-007-0039-z

摘要： ZSM-35 zeolite membranes were prepared on porous stainless steel tubes with silica sol and tetraethoxysilane as silica source, and with 1-butylamine and ethylenediamine as templates, respectively. The characterization of X-ray diffraction (XRD) and scanning electron microscopy (SEM) showed that the membranes prepared with ethylenediamine as the template displayed growth orientation with their crystal planes (h00) parallel to the support surface. The single-component permeability tests of H, N and CH showed that the membranes synthesized with ethylenediamine as the template, compared with those with 1-butylamine as the template, showed relatively higher permeation rates and ideal separation factors, and above their corresponding ideal Knudsen diffusion factors, which might be attributed to the different growth orientation of zeolite membranes synthesized with different templates.

关键词： single-component permeability     diffusion     different     permeation     orientation    

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Theoretical study on Janus graphene oxide membrane for water transport

Quan Liu, Mingqiang Chen, Yangyang Mao, Gongping Liu

《化学科学与工程前沿（英文）》 2021年 第15卷 第4期   页码 913-921 doi: 10.1007/s11705-020-1954-5

摘要： Graphene oxide (GO) membranes have received considerable attention owing to their outstanding water-permeation properties; however, the effect of the membrane’s microstructures (such as the distribution of oxidized and pristine regions) on the transport mechanism remains unclear. In this study, we performed molecular simulations to explore the permeation of a water–ethanol mixture using a new type of Janus GO membranes with different orientations of oxidized and pristine surfaces. The results indicate that the oxidized upper surface endows the GO membrane with considerable water-capture capability and the in-built oxidized interlayer promotes the effective vertical diffusion of water molecules. Consequently, using the optimized Janus GO membrane, infinite water selectivity and outstanding water flux (~40.9 kg⋅m ⋅h ) were achieved. This study contributes to explaining the role of oxidized regions in water permeation via GO membranes and suggests that Janus GO membranes could be used as potential candidates for water–ethanol separation.

关键词： graphene oxide membrane     molecular dynamics simulation     water permeation     water-ethanol separation     oxidized and pristine regions    

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A CO and CO

Guoxing Chen, Marc Widenmeyer, Binjie Tang, Louise Kaeswurm, Ling Wang, Armin Feldhoff, Anke Weidenkaff

《化学科学与工程前沿（英文）》 2020年 第14卷 第3期   页码 405-414 doi: 10.1007/s11705-019-1886-0

摘要： A series of novel dense mixed conducting ceramic membranes based on K NiF -type (La Ca ) (Ni Cu )O was successfully prepared through a sol-gel route. Their chemical compatibility, oxygen permeability, CO and CO tolerance, and long-term CO resistance regarding phase composition and crystal structure at different atmospheres were studied. The results show that higher Ca contents in the material lead to the formation of CaCO . A constant oxygen permeation flux of about 0.63 mL·min ·cm at 1173 K through a 0.65 mm thick membrane was measured for (La Ca ) (Ni Cu )O , using either helium or pure CO as sweep gas. Steady oxygen fluxes with no sign of deterioration of this membrane were observed with increasing CO concentration. The membrane showed excellent chemical stability towards CO for more than 1360 h and phase stability in presence of CO for 4 h at high temperature. In addition, this membrane did not deteriorate in a high-energy CO plasma. The present work demonstrates that this (La Ca ) (Ni Cu )O membrane is a promising chemically robust candidate for oxygen separation applications.

关键词： K2NiF4 structure     oxygen permeation membrane     CO2 and CO resistances     CO2 plasma resistance     long-term robustness    

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Novel methods by using non-vacuum insulated tubing to extend the lifetime of the tubing

Chenglong ZHOU,Guojin ZHU,Yongxiang XU,Jifei YU,Xiaoliang ZHANG,Hongzhi SHENG

《能源前沿（英文）》 2015年 第9卷 第2期   页码 142-147 doi: 10.1007/s11708-015-0357-7

摘要： The analysis of the failure mechanics, namely hydrogen permeation of vacuum insulated tubing (VIT), indicated that the failure of VIT could be decreased but could not be avoided. To solve this problem, some measures by using non-vacuum materials were proposed and analyzed in this paper. The results show that to fill the tubing with foam-glass beads or high pressure argon may lead to a good performance.

关键词： vacuum insulated tubing     cyclic steam stimulation     insulation material     thermal conductivity     foam-glass     hydrogen permeation    

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对二氧化碳具有选择性的聚环氧乙烷基薄膜的发展——从实验室到中试规模

Brinkmann Torsten,Lillepärg Jelena,Notzke Heiko,Pohlmann Jan,Shishatskiy Sergey,Wind Jan,Wolff Thorsten

《工程（英文）》 2017年 第3卷 第4期   页码 485-493 doi: 10.1016/J.ENG.2017.04.004

摘要：

气体膜分离法是从气流中分离二氧化碳（CO2）的最有前途的技术之一。例如，采用该技术对燃烧过程中的烟气进行处理，以达到CO2 捕集和封存的目的。聚环氧乙烷嵌段共聚物能够很好地应用于膜分离技术，如Pebax® 或PolyActive™。本文采用PolyActive™ 作为复合薄膜的选择层。在环境温度下，当CO2/N2 选择性超过55 时，这种薄膜的CO2渗透率高达4 m3(STP)·m−2·h−1·bar−1（注：1bar=105 Pa）。这种薄膜可以按照中试规模进行生产放大，而且可以设计成不同的平面膜组件。采用单一气体渗透数据作为唯一的实验输入而开发出的仿真工具可以准确预测这种膜组件的性能。在不同的中试研究中，我们利用烟气和沼气作为原料气流，反复检测这些膜和膜组件的性能。PolyActive™ 在检测中显示出了稳定的分离性能，表明PolyActive™ 非常适用于作为膜材料进行工业规模气体处理。

关键词： 气体渗透     薄膜复合膜     CO2分离     CCS     沼气处理     膜组件    

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标题 作者 时间 类型 操作

Porous ultrathin-shell microcapsules designed by microfluidics for selective permeation and stimuli-triggered

期刊论文

ethylene-co-vinyl alcohol) molecular weight and vinyl alcohol content on morphology, antifouling, and permeation

期刊论文

用于灵敏快速测量超阻隔渗透的预测仪器

完颜剑峰, 曹坤, 陈志平, 李云, 刘晨曦, 吴润卿, 张晓东, 陈蓉

期刊论文

Effect of PEG additives on properties and morphologies of polyetherimide membranes prepared by phase inversion

Jian CHEN, Jiding LI, Xia ZHAN, Xiaolong HAN, Cuixian CHEN,

期刊论文

Preparation and permeability of ZSM-35 zeolite membranes on porous stainless steel tubes

ZHU Gang, WANG Jinqu, ZHANG Yan, LU Jinming, XIU Jinghai

期刊论文

Theoretical study on Janus graphene oxide membrane for water transport

Quan Liu, Mingqiang Chen, Yangyang Mao, Gongping Liu

期刊论文

A CO and CO

Guoxing Chen, Marc Widenmeyer, Binjie Tang, Louise Kaeswurm, Ling Wang, Armin Feldhoff, Anke Weidenkaff

期刊论文

Novel methods by using non-vacuum insulated tubing to extend the lifetime of the tubing

Chenglong ZHOU,Guojin ZHU,Yongxiang XU,Jifei YU,Xiaoliang ZHANG,Hongzhi SHENG

期刊论文

对二氧化碳具有选择性的聚环氧乙烷基薄膜的发展——从实验室到中试规模

Brinkmann Torsten,Lillepärg Jelena,Notzke Heiko,Pohlmann Jan,Shishatskiy Sergey,Wind Jan,Wolff Thorsten

期刊论文