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Creation of porous polymeric membranes by accumulation of water nanodroplets in a miniemulsion system
Polymer Journal ( IF 2.8 ) Pub Date : 2020-05-25 , DOI: 10.1038/s41428-020-0361-6
Yuuka Fukui , Ryota Fujino , Yusuke Sugaya , Keiji Fujimoto

We developed a miniemulsion templating method to prepare porous polymeric membranes. First, water nanodroplets were suspended in an oil phase by using a nonionic and polymeric surfactant to form a water-in-oil ( W / O ) miniemulsion. After the nanodroplets accumulated by centrifugation, a small amount of monomer was added as an oil phase to resuspend the water nanodroplets in a monomer phase. Then, photopolymerization of the monomer phase was conducted to generate pores in the polymeric matrix. The size of the nanodroplets was tuned by the surfactant concentration to control the pore size of the membranes. We could produce pore morphologies such as closed-cellular, open-cellular, and bicontinuous structures by tuning the volume fraction of the nanodroplets. Alternatively, nanodroplets were accumulated by centrifugation, and then further surfactants were added to the monomer to suppress the coalescence of nanodroplets. This enabled us to generate a highly porous open-cellular structure while maintaining the size and spherical shape. Next, HAuCl 4 was reduced by using the surfactant displayed at the inner surface of the pore wall as the reducing agent. Gold nanoparticles were produced in the inner pores of the polymeric membrane, showing coloration derived from local surface plasmon resonance. We prepared hybrid porous membranes by the W / O miniemulsion templating method. First, centrifugal accumulation of water nanodroplets and subsequent polymerization of the oil phase were carried out to form porous membranes. The size of the nanodroplets was tuned by the surfactant concentration to control the pore size of the membranes. We could produce pore morphologies such as closed-cellular, open-cellular, and bicontinuous structures by tuning the volume fraction of the nanodroplets. Next, conjugation of gold nanoparticles over the inner pore walls was carried out by utilizing the reducing ability of surfactants.

中文翻译:

通过在细乳液系统中积累纳米水滴来制备多孔聚合物膜

我们开发了一种微乳液模板方法来制备多孔聚合物膜。首先,通过使用非离子和聚合物表面活性剂将水纳米液滴悬浮在油相中,形成油包水 (W/O) 微乳液。通过离心积累纳米液滴后,加入少量单体作为油相,将水纳米液滴重新悬浮在单体相中。然后,进行单体相的光聚合以在聚合物基质中产生孔。纳米液滴的大小通过表面活性剂浓度进行调节,以控制膜的孔径。我们可以通过调整纳米液滴的体积分数来产生孔形态,例如闭孔、开孔和双连续结构。或者,通过离心积累纳米液滴,然后在单体中加入更多的表面活性剂以抑制纳米液滴的聚结。这使我们能够生成高度多孔的开孔结构,同时保持尺寸和球形。接下来,通过使用显示在孔壁内表面的表面活性剂作为还原剂来还原HAuCl 4 。金纳米粒子在聚合物膜的内孔中产生,显示出源自局部表面等离子体共振的着色。我们通过 W/O 细乳液模板法制备了混合多孔膜。首先,进行水纳米液滴的离心积累和随后的油相聚合以形成多孔膜。纳米液滴的大小通过表面活性剂浓度进行调节,以控制膜的孔径。我们可以通过调整纳米液滴的体积分数来产生孔形态,例如闭孔、开孔和双连续结构。接下来,利用表面活性剂的还原能力,在内孔壁上进行金纳米颗粒的共轭。
更新日期:2020-05-25
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