权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Study on Compressed Fluids in the Critical Region

临界区域压缩流体的研究

基本信息

批准号：
01550739
负责人：
OHGAKI Kazunari
金额：
$ 0.38万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1990
项目状态：
已结题

项目摘要

This project consists of the following subprojects.Pressure-Density-Temperature Relations in the Critical RegionThe pressure-density-temperature relation were determined for CHF_3, N_2O, and C_3H_6 by means of a direct method. The critical properties were determined from a logarithmic plot based on the power law for each system. The restricted linear model, one of the simplest scaled equation of state, was applied to describe thermodynamic relations in the critical region.Substituent Effect on Solubilities of Solid in Super-critical FluidsOne of the interesting findings is that a di-substitution does not always show the depression in solubilities of each mono-substituted derivatives. The substituent effect on solubilities was discussed by use of electronic properties of substituents. The empirical principles of solubility changes have been drawn out from experimental results. Finally, the empirical rules in choosing appropriate super-critical solvents have been itemized in terms of fiv … More e articles.Solute clusters in aqueous solutionsThe density gradients observed in supersaturated solutions can be expressed satisfactorily by use of a theoretical model based on the Brownian diffusion equation for solute clusters under gravity. Electron microscopy also strongly suggests the existence of solute clusters in supersaturated solutions. The cluster size was estimated to be about 16 nm in diameter.Whisker formation from jet of supercritical fluid solutionThe growth mechanism of a whisker of stigmasterol particles deposited by rapid expansion from supercritical CO_2 solutions has been investigated by scanning electron microscope. Amorphous fine particles were found to be under relatively low pre-expansion pressures while whisker-like crystals were observed under relatively high pre-expansion pressures. It was found that the secondary products grew on a screen in the expansion jet after deposition of primary particles of about 15 nm diameter. The morphology of secondary products was found to strongly depend on the surface condition of the primary particle. Less

本项目包括以下子项目：临界区压力-密度-温度关系用直接法测定了CHF_3、N_2O和C_3H_6的压力-密度-温度关系。根据每个系统的幂律，从对数图确定临界性质。本文采用限制性线性模型描述了临界区的热力学关系。取代基对固体在超临界流体中溶解度的影响一个有趣的发现是，双取代并不总是降低每一个单取代衍生物的溶解度。利用取代基的电子性质讨论了取代基对溶解度的影响。从实验结果中得出了溶解度变化的经验规律。最后，从五个方面列举了选择合适的超临界溶剂的经验法则 ...更多信息 e articles. solute clusters in aqueous solutions水溶液中的溶质团簇在过饱和溶液中观察到的密度梯度可以通过使用基于重力下溶质团簇的布朗扩散方程的理论模型令人满意地表示。电子显微镜也强烈表明在过饱和溶液中存在溶质团簇。超临界流体射流中晶须的形成用扫描电镜研究了超临界CO_2溶液快速膨胀沉积的豆甾醇晶须的生长机理。非晶细颗粒被发现是在相对较低的预膨胀压力下，而晶须状晶体被观察到在相对较高的预膨胀压力下。结果发现，在沉积了直径约为15 nm的初级颗粒后，次级产物在膨胀射流中的筛网上生长。次级产物的形态被发现强烈依赖于初级颗粒的表面条件。少