Effect of size ratio of smart microgels gates to membrane pores on the responsibility of smart membranes

doi:10.16085/j.issn.1000-6613.2017-0803

Abstract

Abstract: The responsibility is one of the key properties of the smart membranes. In this paper, the effect of both the thermo-responsive factor of smart microgels and the size ratio of smart microgels to membrane pores on the responsibility of the smart membranes was quantitatively and systematically investigated using computational fluid dynamics (CFD)based on the straight single-pore model with poly (N-isopropylacrylamide) (PNIPAM) smart microgels immobilized on the wall of the pores. To investigate the accuracy of the CFD simulation results, the thermo-responsive gating coefficients of smart membranes were also experimentally measured. The CFD simulation results showed that when the size ratio of smart microgels to membrane pores was constant, the thermo-responsive gating coefficient of smart membranes increased with the decrease of the thermo-responsive factor of smart microgels. When size ratio was less than 0.4, the measured thermo-responsive gating coefficient was in accordance with the simulation results of the PNIPAM content of 100%. However, the measured results agreed with the simulation results of the PNIPAM content of 67% when the size ratio was larger than 0.4. In general, the satisfactory responsibility and stable permeability of smart membranes were achieved simultaneously when the size ratio was in the range of 0.4 to 0.65. The results will provide valuable guidelines and experimental foundation for the design and fabrication of smart membranes with high performances.

Key words: smart membrane, computational fluid dynamics, permeability, poly (N-isopropylacrylamide), smart microgels gates, thermo-responsive gating coefficient

摘要： 智能膜的响应性能是其主要性能之一。本文借助计算流体力学（CFD）模拟，以孔壁排布有聚N-异丙基丙烯酰胺（PNIPAM）智能微球的单直膜孔为模型，定量系统地考察了智能微球的响应倍数以及微球尺寸与膜孔径的匹配性对膜温度响应性能的影响规律，并通过实验验证了模拟结果的可靠性。CFD模拟结果表明，当智能开关与膜孔径的相对比值一定时，温度响应开关系数随着微球响应倍数的减小而逐渐增大。当相对比值小于0.4时，实测的温度响应开关系数与固载量100%的模拟结果相吻合；而当相对比值大于0.4时，其与固载量为67%的模拟结果相吻合。通常当相对比值在0.4～0.65之间时，智能膜可以同时获得良好的温度响应性能和稳定的渗透性能。该研究结果可望为设计和制备高性能智能膜提供理论指导和实验基础。

关键词: 智能膜, 计算流体力学, 渗透率, 聚N-异丙基丙烯酰胺, 微球开关, 温度响应开关系数

CLC Number:

TB381

WU Wen, ZHU Huacheng, XIE Rui, ZHANG Lei, LUO Feng, JU Xiaojie, WANG Wei, LIU Zhuang, CHU Liangyin. Effect of size ratio of smart microgels gates to membrane pores on the responsibility of smart membranes[J]. Chemical Industry and Engineering Progress, 2018, 37(01): 223-229.

武文, 朱铧丞, 谢锐, 张磊, 骆枫, 巨晓洁, 汪伟, 刘壮, 褚良银. 智能膜开关尺寸与孔径的匹配性对膜响应性能的影响规律[J]. 化工进展, 2018, 37(01): 223-229.

References

[1] 谢锐,巨晓洁,汪伟,等. 智能膜对传质和反应与分离过程的调控[J]. 化工学报,2015,66(9):3279-3286. XIE R,JU X J,WANG W,et al. Regulation on rates of mass transfer,reaction and separation via smart membranes[J]. CIESC Journal,2015,66(9):3279-3286.
[2] CHU L Y,XIE R,JU X J. Stimuli-responsive membranes:smart tools for controllable mass-transfer and separation processes[J]. Chinese Journal of Chemical Engineering,2011,19(6):891-903.
[3] CHOI Y J,YAMAGUCHI T,NAKAO S I. A novel separation system using porous thermosensitive membranes[J]. Industrial & Engineering Chemistry Research,2000,39(7):2491-2495.
[4] YANG M,CHU L Y,WANG H D,et al. A thermoresponsive membrane for chiral resolution[J]. Advanced Functional Materials,2008,18(4):652-663.
[5] LIU Z,LUO F,JU X J,et al. Positively K⁺-responsive membranes with functional gates driven by host-guest molecular recognition[J]. Advanced Functional Materials,2012,22(22):4742-4750.
[6] CHU L Y,LIANG Y J,CHEN W M,et al. Preparation of glucose-sensitive microcapsules with a porous membrane and functional gates[J]. Colloids and Surfaces B:Biointerfaces,2004,37(1/2):9-14.
[7] YANG W C,XIE R,PANG X Q,et al. Preparation and characterization of dual stimuli-responsive microcapsules with a superparamagnetic porous membrane and thermo-responsive gates[J]. Journal of Membrane Science,2008,321(2):324-330.
[8] HU K,DICKSON J M. In vitro investigation of potential application of pH-sensitive poly(vinylidene fluoride)-poly(acrylic acid) pore-filled membranes for controlled drug release in ruminant animals[J]. Journal of Membrane Science,2009,337(1/2):9-16.
[9] WEI J,JU X J,ZOU X Y,et al. Multi-stimuli-responsive microcapsules for adjustable controlled-release[J]. Advanced Functional Materials,2014,24(22):3312-3323.
[10] LEWIS S R,DATTA S,GUI M H,et al. Reactive nanostructured membranes for water purification[J]. Proceedings of the National Academy of Sciences of the United States of America,2011,108(21):8577-8582.
[11] LIU Z,LUO F,JU X J,et al. Gating membranes for water treatment:detection and removal of trace Pb²⁺ ions based on molecular recognition and polymer phase transition[J]. Journal of Materials Chemistry A:Materials for Energy and Sustainability,2013,1(34):9659-9671.
[12] MENNE D,PITSCH F,WONG J E,et al. Temperature-modulated water filtration using microgel-functionalized hollow-fiber membranes[J]. Angewandte Chemie International Edition,2014,53(22):5706-5710.
[13] OKAJIMA S,SAKAI Y,YAMAGUCHI T. Development of a regenerable cell culture system that senses and releases dead cells[J]. Langmuir,2005,21(9):4043-4049.
[14] DA SILVA R M P,MANO J F,REIS R L. Smart thermoresponsive coatings and surfaces for tissue engineering:switching cell-material boundaries[J]. Trends in Biotechnology,2007,25(12):577-583.
[15] NIE P P,HE X L,CHEN L. Temperature-sensitive chitosan membranes as a substrate for cell adhesion and cell sheet detachment[J]. Polymers for Advanced Technologies,2012,23(3):447-453.
[16] 褚良银,谢锐,巨晓洁. 智能膜材料研究新进展[J]. 化工进展,2011,30(1):167-171. CHU L Y,XIE R,JU X J. Progress of development of smart membrane materials[J]. Chemlcal Industry and Engineering Progress,2011,30(1):167-171.
[17] WANG G,XIE R,JU X J,et al. Thermo-responsive polyethersulfone composite membranes blended with poly(N-isopropylacrylamide) nanogels[J]. Chemical Engineering Technology,2012,35(11):2015-2022.
[18] CHEN X,BI S Y,SHI C C,et al. Temperature-sensitive membranes prepared from blends of poly(vinylidene fluoride) and poly(N-isopropylacrylamides) microgels[J]. Colloid and Polymer Science,2013,291(10):2419-2428.
[19] LUO F,XIE R,LIU Z,et al. Smart gating membranes with in situ self-assembled responsive nanogels as functional gates[J]. Scientific Reports,2015,5:14708
[20] LUO F,ZHAO Q,XIE R,et al. Effects of fabrication conditions on the microstructures and performances of smart gating membranes with in situ assembled nanogels as gates[J]. Journal of Membrane Science,2016,519:32-44.
[21] WU C J,XIE R,WEI H B,et al. Fabrication of a thermo-responsive membrane with cross-linked smart gates via a ‘grafting-to’ method[J]. RSC Advances,2016,6(51):45428-45433.
[22] SCHMIDT S,ZEISER M,HELLWEG T,et al. Adhesion and mechanical properties of pnipam microgel films and their potential use as switchable cell culture substrates[J]. Advanced Functional Materials,2010,20(19):3235-3243.
[23] PELTON R. Temperature-sensitive aqueous microgels[J]. Advances in Colloid and Interface Science,2000,85(1):1-33.