Soft dendritic microparticles with unusual adhesion and structuring properties
Soft dendritic microparticles with unusual adhesion and structuring properties
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DOI：
10.1038/s41563-019-0508-z
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发表时间：
2019-10
期刊：
影响因子：
41.2
通讯作者：
Sangchul Roh;Austin H. Williams;Rachel S Bang;S. Stoyanov;O. Velev
中科院分区：
文献类型：
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作者：
Sangchul Roh;Austin H. Williams;Rachel S Bang;S. Stoyanov;O. Velev
颗粒的形态、排除体积和粘附性之间的相互作用关键地决定了许多软材料和涂层的物理性能。支化颗粒或纳米纤维、纳米纤维化或气相二氧化硅可以增强胶体的结构构建能力，其粘附性也可以通过毛细作用或粘结剂来增加。然而，自然界中发现的另一种强粘附性机制包括具有许多亚接触(接触分裂)、-的纤维垫，如壁虎蜥蜴和蜘蛛网的脚、-。在这里，我们描述了具有树枝状形态的分支纳米纤维冠状的分层结构聚合物微粒的制备。在高度湍动的流动中，聚合物沉淀会导致具有分形分支和纳米纤维接触分裂的微粒，这些微粒在极低的体积分数下表现出凝胶化，强烈的颗粒间粘附性，并结合到涂层和无纺布片材中。这些柔软的树枝状颗粒在食品、个人护理或医药产品配方中也具有潜在的优势。
The interplay between morphology, excluded volume and adhesivity of particles critically determines the physical properties of numerous soft materials and coatings, , , , –. Branched particles or nanofibres, nanofibrillated cellulose or fumed silica can enhance the structure-building abilities of colloids, whose adhesion may also be increased by capillarity or binding agents. Nonetheless, alternative mechanisms of strong adhesion found in nature involve fibrillar mats with numerous subcontacts (contact splitting), , , –as seen in the feet of gecko lizards and spider webs, , , , –. 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.