Li Yunqi, Shi Tongfei, Sun Zhaoyan, An Lijia, Huang Qingrong
Department of Food Science, Rutgers University, 65 Dudley Road, New Brunswick, New Jersey 08901, USA.
J Phys Chem B. 2006 Dec 28;110(51):26424-9. doi: 10.1021/jp066019r.
Physical gelation in the concentrated Pluronic F127/D2O solution has been studied by a combination of small-angle neutron scattering (SANS) and Monte Carlo simulation. A 15% F127/D2O solution exhibits a sol-gel transition at low temperature and a gel-sol transition at the higher temperature, as evidenced by SANS and Monte Carlo simulation studies. Our SANS and simulation results also suggest that the sol-gel transition is dominated by the formation of a percolated polymer network, while the gel-sol transition is determined by the loss of bound solvent. Furthermore, different diffusion behaviors of different bound solvents and free solvent are observed. We expect that this approach can be further extended to study phase behaviors of other systems with similar sol-gel phase diagrams.
通过小角中子散射（SANS）和蒙特卡罗模拟相结合的方法，对浓聚醚F127/D2O溶液中的物理凝胶化进行了研究。小角中子散射和蒙特卡罗模拟研究表明，15%的F127/D2O溶液在低温下呈现溶胶-凝胶转变，在较高温度下呈现凝胶-溶胶转变。我们的小角中子散射和模拟结果还表明，溶胶-凝胶转变主要由渗透聚合物网络的形成主导，而凝胶-溶胶转变则由结合溶剂的损失决定。此外，还观察到不同结合溶剂和自由溶剂的不同扩散行为。我们期望这种方法可以进一步扩展，以研究具有相似溶胶-凝胶相图的其他系统的相行为。
