Wilking J N, Graves S M, Chang C B, Meleson K, Lin M Y, Mason T G
Department of Chemistry and Biochemistry, California NanoSystems Institute, University of California-Los Angeles, Los Angeles, California 90095, USA.
Phys Rev Lett. 2006 Jan 13;96(1):015501. doi: 10.1103/PhysRevLett.96.015501. Epub 2006 Jan 3.
Using time-resolved small angle neutron scattering, we have measured the wave-number-dependent structure factor S(q) of monodisperse nanoemulsions that aggregate and gel after we suddenly turn on a strong, short-range, slippery attraction between the droplets. At high q, peaks in S(q) appear as dense clusters of droplets form, and S(q) increases strongly toward low q, as these dense clusters become locked into a rigid gel network, despite the fluidity of the films between the droplets. The long-time high-q structure of nanoemulsion gels formed by slippery diffusion-limited cluster aggregation is universal in shape and remarkably independent of the droplet volume fraction, phi.
通过时间分辨小角中子散射，我们测量了单分散纳米乳液的波数相关结构因子S(q)。在我们突然开启液滴间强的、短程的、滑动吸引力后，这些纳米乳液会发生聚集并形成凝胶。在高q值时，随着液滴密集簇的形成，S(q)出现峰值；而在低q值时，尽管液滴间薄膜具有流动性，但随着这些密集簇锁定成刚性凝胶网络，S(q)会急剧增加。由滑动扩散限制簇聚集形成的纳米乳液凝胶的长时间高q结构在形状上具有普遍性，并且显著独立于液滴体积分数φ。
