Dynamic Interactive Membranes with Pressure-Driven Tunable Porosity and Self-Healing Ability
Dynamic Interactive Membranes with Pressure-Driven Tunable Porosity and Self-Healing Ability
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DOI：
10.1002/anie.201201686
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发表时间：
2012-01-01
影响因子：
16.6
通讯作者：
Quemener, Damien
中科院分区：
文献类型：
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作者：
Tyagi, Prashant;Deratani, Andre;Quemener, Damien
在扩展尺度上具有工程相互作用的动态相互作用系统的科学兴趣正在不断增长，因为这些系统可能显示出在分子水平上不存在的新特性。[1-3]理解和控制从分子水平到纳米尺度的放大[4-6]可能会为现代技术核心的新兴系统设计的基本特征提供新的见解，例如组织工程，[7]人造器官，[8]催化，[9]膜过滤[10]和传感。[11]作为机械支持，分子电容器/分配器或门控效应器的多孔系统的从头设计以及基于自修复，[12-14]自清洁，[15，16]和刺激响应[17]特性的策略的使用已成为越来越感兴趣的领域。用于水过滤的传统膜取决于其结构行为和体积孔隙率而经受强压缩。[18通常进行不可逆压实以达到稳态通量，从而使膜具有稳定的孔径。相比之下，响应膜可以根据环境条件如pH、温度、光和离子强度的变化来自我调节其性能。[20-22]在本工作中，阿坝三嵌段共聚物聚（苯乙烯-共-丙烯腈）-b-聚（环氧乙烷）-b-聚（苯乙烯-共-丙烯腈）（PSAN-b-PEO-b-PSAN）已用于产生花状胶束。它们由PEO（26体积%）的可压缩亲水性软冠和保持胶束结构完整性的PSAN疏水性硬核组成（图1）。当将共聚物溶液旋涂到硅片上时，溶剂的蒸发导致通过直径为50 nm的胶束组装形成多孔膜。胶束之间的可逆非共价相互作用在宏观水平上介导其动态自组装，使得胶束之间存在自由体积，从而赋予膜纳米孔隙率。[23-27]除了PEO链的可逆相互作用外，胶束组装也通过阿坝共聚物和两个不同胶束核心的A嵌段之间的桥接连接部分增强（支持信息中的图1 B和图S1-S4）。[28这些胶束系统的形态可以针对不同的功能进行微调。形态学变化的证据，在水渗透的研究中，其中的水压力正交的膜表面是不同的。对于0.04至3巴的相对水压，
Scientific interest in dynamic interactive systems with engineered interactions on extended scales is continuously growing because these systems may display novel properties not present at the molecular level.[1–3] Understanding and controlling the scale-up from the molecular level toward nanoscale dimensions [4–6] might provide new insights into basic features in the design of emergent systems at the heart of modern technologies such as tissue engineering,[7] artificial organs,[8] catalysis,[9] membrane filtration,[10] and sensing.[11] The de novo design of porous systems used as mechanical supports, molecular capacitors/distributors, or gating effectors and the use of strategies based on self-healing,[12–14] selfcleaning,[15, 16] and stimuli-response [17] properties has become an area of growing interest. Classical membranes for water filtration are subjected to strong compression depending on their structural behavior and bulk porosity.[18, 19] Irreversible compaction is usually effected in order to reach a steady-state flux, giving the membrane a stable pore size. In contrast, a responsive membrane can self-regulate its performance according to changes in environmental conditions such as pH, temperature, light, and ionic strength.[20–22] In the present work, the ABA triblock copolymer poly (styrene-co-acrylonitrile)-b-poly (ethylene oxide)-b-poly (styrene-co-acrylonitrile)(PSAN-b-PEO-b-PSAN) has been used to generate flowerlike micelles. They consist of a compressible hydrophilic soft corona of PEO (26 vol%) and a hydrophobic hard core of PSAN which maintains the micelle s structural integrity (Figure 1). When a copolymer solution is spin-coated onto a silicon wafer, evaporation of the solvent results in the formation of a porous film through the assembly of micelles 50nm in diameter. Reversible noncovalent interactions between the micelles mediate their dynamic self-assembly at the macroscopic level such that there is free volume between the micelles, imparting nanoporosity to the film.[23–27] In addition to the reversible interactions of the PEO chains, the micelle assembly is also partially reinforced by bridging links between the ABA copolymer and the A blocks of two different micelle cores (Figure 1 b and Figures S1–S4 in the Supporting Information).[28, 29] The morphology of these micellar systems can be fine-tuned for different functions. Evidence for morphological changes was obtained in studies of water permeation in which the water pressure orthogonal to the membrane surface was varied. For relative water pressures from 0.04 to 3 bar, the water flow resistance R of the