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首页> 外文期刊>Physical Review X >Rheoacoustic Gels: Tuning Mechanical and Flow Properties of Colloidal Gels with Ultrasonic Vibrations
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Rheoacoustic Gels: Tuning Mechanical and Flow Properties of Colloidal Gels with Ultrasonic Vibrations

机译：车辆凝胶：用超声波振动调节胶体凝胶的机械和流动性能

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摘要

Colloidal gels, where nanoscale particles aggregate into an elastic yet fragile network, are at the heart of materials that combine specific optical, electrical, and mechanical properties. Tailoring the viscoelastic features of colloidal gels in real time thanks to an external stimulus currently appears as a major challenge in the design of “smart” soft materials. Here we introduce “rheoacoustic” gels, a class of materials that are sensitive to ultrasonic vibrations. By using a combination of rheological and structural characterization, we evidence and quantify a strong softening in three widely different colloidal gels submitted to ultrasonic vibrations (with submicron amplitude and frequency 20–500?kHz). This softening is attributed to micron-sized cracks within the gel network that may or may not fully heal once vibrations are turned off depending on the acoustic intensity. Ultrasonic vibrations are further shown to dramatically decrease the gel yield stress and accelerate shear-induced fluidization. Ultrasound-assisted fluidization dynamics appear to be governed by an effective temperature that depends on the acoustic intensity. Our work opens the way to a full control of elastic and flow properties by ultrasonic vibrations as well as to future theoretical and numerical modeling of such rheoacoustic gels.
机译：粉末凝胶，其中纳米级粒子聚集成弹性但易碎网络，是在结合特定光学，电气和机械性能的材料的核心。由于外部刺激目前在“智能”软材料的设计中，实时刺激胶体凝胶的粘弹性特征实时刺激。在这里，我们介绍了“车道声学”凝胶，一类对超声波振动敏感的材料。通过使用流变和结构特征的组合，我们证据并量化了三种不同的不同胶体凝胶的强烈软化（提交超声波振动（亚微米振幅和频率20-500？KHz）。这种软化归因于凝胶网络内的微米尺寸裂缝，这一旦根​​据声强度关闭振动一旦振动就会或可能无法完全愈合。进一步示出超声振动以显着降低凝胶屈服应力并加速剪切诱导的流化。超声辅助流化动力学似乎受到依赖于声学强度的有效温度的管辖。我们的工作通过超声波振动完全控制弹性和流动性能，以及这种流声凝胶的未来理论和数值模型。

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