Hydrogel Microellipsoids that Form Robust String‐Like Assemblies at the Air/Water Interface. (25th April 2019)

• Record Type: Journal Article
• Authors: Honda, Kenshiro; Sazuka, Yuka; Iizuka, Kojiro; Matsui, Shusuke; Uchihashi, Takayuki; Kureha, Takuma; Shibayama, Mitsuhiro; Watanabe, Takumi; Suzuki, Daisuke
• Is Part Of: Angewandte Chemie. Volume 131:Number 22(2019)
• Page Start: 7372
• Page End: 7376
• Publication Date: 2019-04-25
• Subjects: Grenzflächen -- Hydrogele -- Kolloide -- Mikrogele -- Selbstorganisation; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.201901611
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: Soft colloidal particles such as hydrogel microspheres assemble at air/water or oil/water interfaces, where the soft colloids are highly deformed and their surface polymer chains are highly entangled with each other. Herein, we report the formation of robust one‐dimensional, string‐like colloidal assemblies through self‐organization of hydrogel microspheres with shape anisotropy at the air/water interface of sessile droplets. Shape‐anisotropic hydrogel microspheres were synthesized via two‐step polymerization, whereby a hydrogel shell was formed onto preformed rigid microellipsoids. The shape anisotropy of the hydrogel microspheres was confirmed by transmission electron microscopy and high‐speed atomic force microscopy as well as by light‐scattering measurements. The present findings are crucial for the understanding of natural self‐organization phenomena, where "softness" influences microscopic assembled structures such as those of Nostoc bacteria. Abstract : Die Selbstorganisation anisotroper Hydrogel‐Mikrokügelchen an der Luft/Wasser‐Grenzfläche festgewachsener Tröpfchen resultiert in robusten schnurartigen kolloidalen Anordnungen. Die Weichheit der Mikroellipsoide beeinflusst die geometrische Stabilität der angeordneten Strukturen, deren Robustheit aus der Verflechtung der Hydrogel‐Schicht an der Luft/Wasser‐Grenzfläche resultiert.