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A facile one-step method to synthesize SiO2@polydopamine core–shell nanospheres for shear thickening fluid

机译:用于合成SiO2 @聚二胺核心 - 壳纳米球剪切增稠液的容易一步法

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A facile one-step method was developed to synthesize core–shell structured SiO _(2) @polydopamine (PDA) nanospheres. During the synthesis, a PDA shell was simultaneously coated on the SiO _(2) nanospheres to form the core–shell nanostructure. The PDA shell thickness was tunable by varying the concentration of the starting dopamine precursor. After dispersing the core–shell nanospheres into poly(ethylene glycol) 200 (PEG200), a SiO _(2) @PDA based shear thickening fluid (STF) was obtained. In comparison to pristine SiO _(2) , the SiO _(2) @PDA based STF presented better ST effects and its maximum viscosity could reach as high as 194.6 Pa s. A possible enhancement mechanism was proposed in order to investigate the structural dependence of the ST effect. This high performance SiO _(2) @PDA based STF could be widely applied in body armor and other safe-guarding areas.
机译:开发了一种容易的一步方法以合成核 - 壳结构SiO _(2)α-甲胺(PDA)纳米球。在合成期间,在SiO _(2)纳米球上同时涂覆PDA壳以形成核心 - 壳纳米结构。通过改变起始多巴胺前体的浓度来调谐PDA壳厚度。将核壳纳米球分散到聚(乙二醇)200(PEG200)中,获得SiO_(2)粒子涂层增稠液(STF)。与原始SiO_(2)相比,SIO _(2)基于STF的STF呈现出更好的ST效果,其最大粘度可以高达194.6 PA S。提出了一种可能的增强机制,以研究ST效应的结构依赖性。这种高性能SiO_(2)基于@PDA的STF可以广泛应用于车身铠装和其他安全保护区域。

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