颗粒组成和热循环对Bijel形成的影响
Influence of particle composition and thermal cycling on bijel formation
摘要：
具有适当润湿性质的胶体颗粒可以非常强烈地被捕获在两种不混溶流体之间的界面处。我们利用这种现象创造了一类新的软材料，具有有趣和潜在的有用特性。该材料被称为bijel：双连续界面堵塞的乳液凝胶。它是一种具有流体双连续域的胶体稳定乳液。创造这些凝胶的潜力首先是使用计算机模拟预测的。在实验中，我们使用水和2，6-二甲基吡啶的混合物，其组成使系统在变暖时经历临界分层过渡。当系统处于单流体相时，具有适当表面化学性质的胶态二氧化硅被分散;然后将复合样品缓慢加热至远超过临界温度。液相通过亚稳分解分离，并且颗粒在新产生的界面上被清扫。随着畴变粗，界面面积减小，颗粒最终变得堵塞在一起。所得到的结构具有显著的屈服应力，并且在许多个月内是稳定的。在这里，我们开始探索水-二甲基吡啶混合物中荧光标记的二氧化硅表面的复杂润湿特性，展示如何调整它们以允许bijel创建。此外，我们演示了如何粒子的属性随时间的变化，而他们浸泡在溶剂中。
英文摘要：
Colloidal particles with appropriate wetting properties can become very strongly trapped at an interface between two immiscible fluids. We have harnessed this phenomenon to create a new class of soft materials with intriguing and potentially useful characteristics. The material is known as a bijel: bicontinuous interfacially-jammed emulsion gel. It is a colloid-stabilized emulsion with fluid-bicontinuous domains. The potential to create these gels was first predicted using computer simulations. Experimentally we use mixtures of water and 2,6-lutidine at the composition for which the system undergoes a critical demixing transition on warming. Colloidal silica, with appropriate surface chemistry, is dispersed while the system is in the single-fluid phase; the composite sample is then slowly warmed well beyond the critical temperature. The liquids phase separate via spinodal decomposition and the particles become swept up on the newly created interfaces. As the domains coarsen the interfacial area decreases and the particles eventually become jammed together. The resulting structures have a significant yield stress and are stable for many months. Here we begin to explore the complex wetting properties of fluorescently-tagged silica surfaces in water-lutidine mixtures, showing how they can be tuned to allow bijel creation. Additionally we demonstrate how the particle properties change with time while they are immersed in the solvents.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
