Merrill Jason W, Sainis Sunil K, Dufresne Eric R
Department of Physics, Yale University, New Haven, Connecticut 06520-8120, USA.
Phys Rev Lett. 2009 Sep 25;103(13):138301. doi: 10.1103/PhysRevLett.103.138301. Epub 2009 Sep 21.
Electrostatic forces between small groups of colloidal particles are measured using blinking optical tweezers. When the electrostatic screening length is longer than the interparticle separation, forces are found to be non-pairwise-additive. Both pair and multiparticle forces are well described by the linearized Poisson-Boltzmann equation with constant potential boundary conditions. These findings may play an important role in understanding the structure and stability of a wide variety of systems, from micron-sized particles in oil to aqueous nanocolloids.
使用闪烁光镊测量小胶体颗粒群之间的静电力。当静电屏蔽长度大于颗粒间间距时，发现力是非成对相加的。成对力和多颗粒力都可以用具有恒定势边界条件的线性化泊松-玻尔兹曼方程很好地描述。这些发现可能在理解从油中的微米级颗粒到水性纳米胶体等各种系统的结构和稳定性方面发挥重要作用。
