pH-Responsive Membranes from Self-Assembly of Poly(2-(dimethylamino)ethyl methacrylate) Brush Silica Nanoparticles
pH-Responsive Membranes from Self-Assembly of Poly(2-(dimethylamino)ethyl methacrylate) Brush Silica Nanoparticles
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DOI：
10.1021/acs.langmuir.3c02455
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发表时间：
2023-10-24
期刊：
影响因子：
3.9
通讯作者：
Zharov，Ilya
中科院分区：
文献类型：
--
作者：
Eygeris，Yulia;Ulery，Noah;Zharov，Ilya
我们已经制备了新型的pH响应性纳米多孔膜的自组装二氧化硅纳米粒子携带聚（2-（二甲基氨基）乙基甲基丙烯酸酯）（PDMAEMA）刷的聚合度（DP）在100-450的范围。通过表面引发ARGET-ATRP制备纳米颗粒，并通过压力驱动沉积在多孔载体上组装膜。使用水和己烷通量和过滤截止实验研究了所得稳健膜的渗透性和孔径。通过水通量测量的PDMAEMA“毛状”二氧化硅纳米颗粒（HNP）膜的孔径为约100 nm。22 nm，并且主要独立于聚合物刷长度。我们将其归因于PDMAEMA刷子溶胀及其对水的渗透性的组合。相反，通过己烷通量测量的孔径强烈依赖于DP。这些膜在水中的通量和孔径大小强烈依赖于pH值。当pH值从中性变为酸性时，孔径减小了1.6倍。pH响应HNP膜结合了联合收割机许多有吸引力的特性，包括对过滤截止的控制、响应渗透性和低压下的高通量。PDMAEMA HNP膜的可逆自组装不仅可以帮助其容易制备，而且如果发生生物污染，还可以帮助材料回收。PDMAEMA HNP组件的关键特征在膜分离、分子阀和生物传感器中具有吸引力，其中高度期望对孔径和孔门控进行精确控制。
We have prepared novel pH-responsive nanoporous membranes by the self-assembly of silica nanoparticles carrying poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) brushes with a degree of polymerization (DP) in the 100–450 range. The nanoparticles were prepared by surface-initiated ARGET-ATRP, and the membranes were assembled by pressure-driven deposition onto porous supports. The permeability and pore size of the resulting robust membranes were studied using water and hexane flux and filtration cutoff experiments. The pore size of the PDMAEMA “hairy” silica nanoparticle (HNP) membranes measured by water flux was ca. 22 nm and was mostly independent of the polymer brush length. We attributed this to a combination of the PDMAEMA brushes swelling and their permeability to water. In contrast, the pore size measured by hexane flux strongly depended on the DP. The flux and pore size of these membranes in water strongly depended on the pH. The pore size decreased by a factor of 1.6 when the pH was changed from neutral to acidic. pH-Responsive HNP membranes combine many attractive properties, including control over the filtration cutoff, responsive permeability, and high flux at low pressure. The reversible self-assembly of the PDMAEMA HNP membranes may help not only in their facile preparation but also in material recycling if biofouling occurs. The key features of the PDMAEMA HNP assemblies are attractive in membrane separations, molecular valves, and biosensors, where having precise control over the pore size and pore gating is highly desirable.