School of Physics, Georgia Institute of Technology, 837 State Street, Atlanta, Georgia 30332, USA.
J Chem Phys. 2010 Jul 21;133(3):034901. doi: 10.1063/1.3447386.
We study the structural properties of microgels made of poly(N-isopropylacrylamide) and acrylic acid as a function of hydrostatic pressure and temperature using small angle neutron scattering. Hydrostatic pressure induces particle deswelling by changing the mixing of the microgel with the solvent, similar to temperature. We extend this analogy to the structural properties of the particles and show that the form factor at a certain temperature is equal to the form factor at a certain hydrostatic pressure. We fit the results with an existent model for the microgel structure and carefully analyze the fitting procedure in order to obtain physically meaningful values of the free parameters in the model.
我们使用小角中子散射研究了由聚（N-异丙基丙烯酰胺）和丙烯酸组成的微凝胶的结构特性作为静水压力和温度的函数。静水压力通过改变微凝胶与溶剂的混合来引起粒子收缩，类似于温度的作用。我们将这种类比扩展到粒子的结构特性上，并表明在一定温度下的形状因子等于在一定静水压力下的形状因子。我们用现有的微凝胶结构模型拟合结果，并仔细分析拟合过程，以获得模型中自由参数的物理意义值。
