论文标题
粒径对水（N-异丙基丙烯酰胺）胶体悬浮液的热响应和流变特性的影响
Influence of particle size on the thermoresponsive and rheological properties of aqueous poly(N-isopropylacrylamide) colloidal suspensions
论文作者
论文摘要
通过用一锅方法改变硫酸钠（SDS）的浓度来合成不同大小的热响应聚聚（N-异丙基丙烯酰胺）（PNIPAM）颗粒。使用动态光散射和扫描电子显微镜，表征了PNIPAM颗粒的尺寸，尺寸多分散性和pNIPAM颗粒的热响应性。观察到这些颗粒的尺寸随SDS浓度的增加而降低。观察到从热响应曲线测得的PNIPAM颗粒的肿胀比随着粒径减少而增加。通过最大程度地减少系统的Helmholtz自由能，相对于颗粒的肿胀比，可以理解该观察结果。最后，通过进行流变学测量，研究了这些颗粒的动力学。
Thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) particles of different sizes are synthesized by varying the concentration of sodium dodecyl sulphate (SDS) in a one-pot method. The sizes, size polydispersities and the thermoresponsivity of the PNIPAM particles are characterized by using dynamic light scattering and scanning electron microscopy. It is observed that the sizes of these particles decrease with increase in SDS concentration. Swelling ratios of PNIPAM particles measured from the thermoresponsive curves are observed to increase with decrease in particle size. This observation is understood by minimizing the Helmholtz free energy of the system with respect to the swelling ratio of the particles. Finally, the dynamics of these particles in jammed aqueous suspensions are investigated by performing rheological measurements.
