Long-Range Interaction between Macroparticles in Binary Fluid Mixture

在对RHNC理论的分析中，使用两个成分流体接近表面（e.）g.，（宏观粒子），我们在表面诱导层的厚度中发现了一个突然增长的增长，其中的结构和组成与那些块的结构和组成有明显的不同。Moreover，最近的增长与表面之间的强、长范围的吸引力相结合。这是一种过渡现象的序列：接近表面的第二阶段的形成，它可以被称为表面诱导的阶段过渡。我们在使用原子力显微镜的甲基己烷系统中测量了甲基表面硅探针（案例A）和甲基表面硅球体（案例B）之间的力量。在A案中，我们发现了吸引力的范围，L反对甲醇浓缩X。在B例中，我们还在表面分离的7.5纳米处绘制了吸引力F的强度。由于己烷中甲醇的饱和度集中已被接近，L和F两者都显著共享，这意味着在羟基表面附近的甲基丰富层中突然增长。在高甲醇集中营下的力量比传统范德瓦尔斯部队的更长的距离更远。然后我们可以在乙醇-六烯系统中测量出Mica表面硅腈探针之间的力量。该系统在半导体组合范围内是稳定的，作为一个单一阶段。接近乙醇的浓度。1.9重量%，吸引力的范围显示了一个突然的增长，它可以被解释为表面诱导的阶段过渡的信号。我们还以我们自己的方式审查了其他研究人员报告的实验数据，并将表面诱导的相位转换是否存在。在理解系统的表面或界面的地方扮演关键角色时，它将非常有用。g.，colloids， biological systems，等等。

In analyses using the RHNC theory for two-component fluids near surfaces (e. g., macro-particles), we have found a sudden growth in the thickness of the surface-induced layer whose structure and composition are quite different from those of the bulk. Moreover, the sudden growth is accompanied by appearance of strong, long-range attractive force between surfaces. This is a sort of transition phenomenon : formation of the second phase near the surface that can be called the surface-induced phase transition. We have measured forces between mica surface-silicon nitride probe (case A) and mica surface-silica sphere (case B) in methanol-hexane system using an atomic force microscope. We have plotted the range of the attractive force L against the methanol concentration X in case A. We have also plotted the strength of the attractive force F at the surface separation 7.5nm against X in case B. As the saturation concentration of methanol in hexane is approached, both L and F increase very sharply, which implies a sudden growth in the methanol-rich layer near the hydrophilic surfaces. The forces under high methanol concentration are far longer-range than the conventional van der Waals forces. We have then measured forces between mica surface-silicon nitride probe in ethanol-hexane system. This system is thermodynamically stable as a single phase in the entire composition range. Near ethanol concentration of 。ォ1.9wt%, the range of the attractive force exhibits a sudden growth that can be interpreted as a signal of the surface-induced phase transition. We have also examined the experimental data reported by other researchers in our own way and concluded that the surface-induced phase transition does exist. It will be very useful in understanding the systems where surfaces or interfaces play critical roles (e. g., colloids, biological systems, etc.).