材料科学
蜘蛛丝
丝绸
支化(高分子化学)
聚合物
壁虎
高分子科学
粘附
纳米技术
复合材料
化学工程
生态学
生物
工程类
作者
Sangchul Roh,Austin Williams,Rachel S. Bang,Simeon D. Stoyanov,Orlin D. Velev
出处
期刊:Nature Materials
[Springer Nature]
日期:2019-10-14
卷期号:18 (12): 1315-1320
被引量:53
标识
DOI:10.1038/s41563-019-0508-z
摘要
The interplay between morphology, excluded volume and adhesivity of particles critically determines the physical properties of numerous soft materials and coatings1–6. Branched particles2 or nanofibres3, nanofibrillated cellulose4 or fumed silica5 can enhance the structure-building abilities of colloids, whose adhesion may also be increased by capillarity or binding agents6. Nonetheless, alternative mechanisms of strong adhesion found in nature involve fibrillar mats with numerous subcontacts (contact splitting)7–11 as seen in the feet of gecko lizards and spider webs12–17. Here, we describe the fabrication of hierarchically structured polymeric microparticles having branched nanofibre coronas with a dendritic morphology. Polymer precipitation in highly turbulent flow results in microparticles with fractal branching and nanofibrillar contact splitting that exhibit gelation at very low volume fractions, strong interparticle adhesion and binding into coatings and non-woven sheets. These soft dendritic particles also have potential advantages for food, personal care or pharmaceutical product formulations. Polymer precipitation under turbulent flows generates soft microparticles with branched dendritic coronas and high adhesive properties.
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