A visualization system based on microscopy,photoelectric imaging analysis and digital processing was developed to investigate the micrometer-level mass transfer process of polyvinylpyrrolidone(PVP)across the interface...A visualization system based on microscopy,photoelectric imaging analysis and digital processing was developed to investigate the micrometer-level mass transfer process of polyvinylpyrrolidone(PVP)across the interface of dichloromethane-water.The concentration-gray scale standard curves were obtained by measuring the gray scales of the images of 10 PVP dichloromethane solutions with different concentrations.The concentrations of PVP corresponding to different times were determined by measuring the gray scales of the images of PVP dichloromethane solutions at the corresponding times.The mass transfer kinetics curve of PVP across the interface of dichloromethane-water was then obtained.In addition,the evolution of flow field in the dichloromethane phase near the interface was observed and analyzed via the visualization system.展开更多
采用 L B 法考察了伊朗重质减渣馏分油 水界面膜的扩张粘弹性。结果表明, 伊朗重质油减渣馏分的扩张粘弹性随馏分的增重以及扩张频率的增大而递变。随着馏分的增重, 扩张模量、扩张弹性、扩张粘度增加,相角减小。随着扩张频率的增大, ...采用 L B 法考察了伊朗重质减渣馏分油 水界面膜的扩张粘弹性。结果表明, 伊朗重质油减渣馏分的扩张粘弹性随馏分的增重以及扩张频率的增大而递变。随着馏分的增重, 扩张模量、扩张弹性、扩张粘度增加,相角减小。随着扩张频率的增大, 扩张模量、扩张弹性增加, 扩张粘度、相角减小。轻馏分界面膜可压缩性好, 缓冲作用强, 扩张粘弹性参数随扩张频率及馏分的递变幅度小; 重馏分界面膜刚性强, 扩张粘弹性参数随扩张频率及馏分的递变幅度大。展开更多
文摘采用动态滴形分析法研究了大豆球蛋白（soy glycinin）吸附在油-水界面上的膨胀流变特性,主要检测了不同初始体相蛋白浓度（C0）和pH值条件下,大豆球蛋白吸附在纯的花生油-水界面上的界面张力（σ）和界面膨胀流变特征参数（界面膨胀模量E、界面膨胀弹性Ed、界面膨胀黏性Ev以及相角θ）随时间的变化。结果表明：随着吸附时间的延长,σ降低,E和Ed增大而减小,大豆球蛋白分子吸附到油-水界面上形成界面蛋白吸附膜;随着C0的增加,吸附速率加快,吸附膜的界面膨胀黏弹性增大,受pH值的影响更为明显;在试验时间（0-120 m in）和频率（0.01-0.5 Hz）范围内,吸附膜的Ed明显大于Ev,从流变学的角度分析,大豆球蛋白吸附到花生油-水界面上形成弹性的吸附膜。
文摘A visualization system based on microscopy,photoelectric imaging analysis and digital processing was developed to investigate the micrometer-level mass transfer process of polyvinylpyrrolidone(PVP)across the interface of dichloromethane-water.The concentration-gray scale standard curves were obtained by measuring the gray scales of the images of 10 PVP dichloromethane solutions with different concentrations.The concentrations of PVP corresponding to different times were determined by measuring the gray scales of the images of PVP dichloromethane solutions at the corresponding times.The mass transfer kinetics curve of PVP across the interface of dichloromethane-water was then obtained.In addition,the evolution of flow field in the dichloromethane phase near the interface was observed and analyzed via the visualization system.
