Zhang Zexin, van Duijneveldt Jeroen S
School of Chemistry, University of Bristol, Cantock's Close, Bristol BS8 1TS, England.
Langmuir. 2006 Jan 3;22(1):63-6. doi: 10.1021/la0520637.
Sterically stabilized silica nanoparticles were synthesized, and turbidity measurements confirmed that they behaved as hard spheres in cyclohexane. Poly(isoprene) was added to give mixtures in the protein limit with a polymer coil/colloid radius ratio of 4.8. Their phase behavior under good solvent conditions was studied experimentally. The critical colloid volume fraction was phi = 0.13, whereas recent simulations (Bolhuis, P. G.; Meijer, E. J.; Louis, A. A. Phys. Rev. Lett. 2003, 90, 068304) predicted phi = 0.24. This difference is ascribed to the fact that many systems showing good solvent scaling behavior of the polymer still have a Flory-Huggins parameter close to 0.5, for instance, chi = 0.45 in this work.
合成了空间稳定的二氧化硅纳米颗粒，浊度测量证实它们在环己烷中表现为硬球。加入聚（异戊二烯）以得到处于蛋白质极限的混合物，聚合物线团/胶体半径比为4.8。实验研究了它们在良溶剂条件下的相行为。临界胶体体积分数为φ = 0.13，而最近的模拟（博尔胡伊斯，P.G.；迈耶，E.J.；路易斯，A.A.《物理评论快报》2003年，90，068304）预测φ = 0.24。这种差异归因于这样一个事实，即许多显示聚合物具有良溶剂标度行为的体系，其弗洛里-哈金斯参数仍接近0.5，例如，本工作中的χ = 0.45。
