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Janus balance of amphiphitic colloidal particles

机译:两性胶体颗粒的Janus平衡

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We introduce the notion of "Janus balance" (7),defined as the dimensionless ratio of work to transfer an amphiphilic colloidal particle (a "Janus particle") from the oil-water interface into the oil phase,normalized by the work needed to move it into the water phase.The 7 value can be calculated simply from the interfacial contact angle and the geometry of Janus particles,without the need to know the interfacial energy.It is demonstrated that Janus particles of the same chemical composition but different geometries will have the highest adsorption energy when 7=1.Even for particles of homogeneous chemical makeup,the Janus balance concept can be applied when considering the contact angle hysteresis in desorbing the particle from equilibrium into the water or oil phase.The Janus balance concept may enable predictions of how a Janus particle behaves with respect to efficiency and function as a solid surfactant,as the Janus balance of solid surfactants is the analog of the classical hydrophile-lipophile balance of small surfactant molecules.
机译:我们引入“ Janus平衡”(Janus balance)(7)的概念,定义为将两亲胶体颗粒(“ Janus颗粒”)从油水界面转移到油相的功的无量纲比,并通过将其移动到水相中。可以简单地从界面接触角和Janus粒子的几何形状计算出7值,而无需了解界面能。事实证明,化学成分相同但几何形状不同的Janus粒子会当7 = 1时具有最高的吸附能。即使对于均匀化学组成的颗粒,在考虑将接触角滞后从平衡状态解吸到水相或油相中时,也可以应用Janus平衡概念。关于Janus颗粒在效率方面的行为以及作为固体表面活性剂的功能的预测,因为固体表面活性剂的Janus平衡是经典加湿剂小表面活性剂分子的促脂亲油平衡。

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