Size-Controlled Formation of Polymer Janus Discs,Angewandte Chemie International Edition

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Size-Controlled Formation of Polymer Janus Discs
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2021-07-15 , DOI: 10.1002/anie.202105235
Xiaolian Qiang ₁ , Steffen Franzka ₂ , Giada Quintieri ₁ , Xuezhi Dai ₁ , Chin Ken Wong ₁ , André H Gröschel ₁

Affiliation

A straightforward method is presented for the preparation of nano- to micrometer-sized Janus discs with controlled shape, size, and aspect ratio. The method relies on cross-linkable ABC triblock terpolymers and involves first the preparation of prolate ellipsoidal microparticles by combining Shirasu porous glass (SPG) membrane emulsification with evaporation-induced confinement assembly (EICA). By varying the pore diameter of the SPG membrane, we produce Janus discs with controlled size distributions centered around hundreds of nanometers to several microns. We further transferred the discs to water by mild sulfonation of PS to polystyrene sulfonic acid (PSS) and verified the Janus character by subsequent labelling with cationic nanoparticles. Finally, we show that the sulfonated Janus discs are amphiphilic and can be used as efficient colloidal stabilizers for oil-in-water (O/W) emulsions.

中文翻译：

聚合物 Janus 圆盘的尺寸控制形成

提出了一种简单的方法来制备具有受控形状、尺寸和纵横比的纳米至微米尺寸的 Janus 圆盘。该方法依赖于可交联的 ABC 三嵌段三元共聚物，首先通过将 Shirasu 多孔玻璃 (SPG) 膜乳化与蒸发诱导限制组件 (EICA) 相结合来制备长椭圆形微粒。通过改变 SPG 膜的孔径，我们生产出尺寸分布受控的 Janus 圆盘，尺寸分布集中在数百纳米到几微米之间。我们进一步通过将 PS 温和磺化为聚苯乙烯磺酸 (PSS) 将圆盘转移到水中，并通过随后用阳离子纳米颗粒标记来验证 Janus 特性。最后，我们证明磺化 Janus 圆盘具有两亲性，可用作水包油 (O/W) 乳液的有效胶体稳定剂。

更新日期：2021-09-20

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