Diffusion-controlled Adsorption Kinetics of Surfactant at Air/Solution Interface

For the diffusion-controlled adsorption, the expression of dynamic surface adsorption Γ(t) was ob-tained by solving the diffusion equation. Two cases, i.e. the short and long time limits, were mainly d...     

加压下二元液体混合物的过热极限

测定了正戊烷等正烷烃及环烷烃二元液体混合物在不同压力(0.1-2. 1MPa)和不同组成下的过热极限,从热力学及动力学角度进行了理论分析及预测,并提出简化计算方法. 对传热、闪蒸等气液传质过程的改进及安全生产,具有重要意义。     

表面活性剂在气/液界面上扩散控制的吸附动力学(英文)

For the diffusion-controlled adsorption, the expression of dynamic surface adsorption P（t） was ob- tained by solving the diffusion equation. Two cases, i.e. the short and long time limits, were mainly discussed in this paper. From the measured dynamic surface tension of aqueous surfactant sodium dodecyl sulfate （SDS） solutions at 25 ℃, the adsorption kinetics of SDS at air/solution interface was studied. It was proved that for both of the short and long time limits, the adsorption process of SDS was controlled by diffusion.     

表面活性剂在气/液界面上的吸附动力学

在求解扩散方程的基础上,推导出了描述气 液界面吸附的动态吸附量Γ(t)表达式,并重点讨论了吸附的初始阶段和最终阶段两种极限情况。试验测定了25℃下表面活性剂C12E7[分子式CH3(CH2)11(OCH2CH2)7OH]水溶液的平衡及动态表面张力,结合理论推导,考察了C12E7在气 液界面的吸附过程。试验结果表明,气 液界面吸附过程在最初(极短时间)阶段是扩散控制,在吸附过程的后期(长时间)则出现了扩散 吸附混合控制。     

优化课程体系,培养高素质化工人才

本着加强基础、培养能力、提高素质、突出创新的总体改革要求，根据基础化学在化工、材料类工程人才培养计划中所占的地位和作用，淡化原二级学科界限，突出重点学科的作用，避免不必要的重复，重新整合成优化的新课程体系。     

扩展球形溶液表面上decanoyl-N-methylglucamine的吸附动力学

A general expression of the dynamic surface adsorption [Г（t）] on the expanding spherical surface was derived by solving the corresponding diffusion equation under different initial and boundary conditions. Different from the result of the still spherical surface, two factors （smaller than 1） appeared in the equation for the short time adsorption. Using the derived results, the adsorption kinetics of aqueous decanoyl-N-methylglucamine （Mega-10） solution was studied. In the short time region （t→0）, a good agreement of experimental results with the theory was reached and the adsorption was controlled by diffusion.     

试纸法测定镀液中银及智能检测程序的开发

利用试纸法测定镀液中的Ag+,可以实现现场测定的简便性.通过试纸变色长度与银浓度之间的线性关系来求得样品中银含量;通过建立试纸长度与银离子浓度线性转换的微信小程序的方法,可直接获得Ag+浓度,该法可测定范围为5～1000μg·mL-1.     

溶液结晶第3亚稳区的测定及理论分析

提出溶液结晶第3亚稳区的概念,并对NaNO_3、KClO_3、K_2Cr_2O_7及H_3BO_3水溶液的第3亚稳区宽度进行测定,发现第3亚稳区宽度比第1及第2亚稳区要宽得多,是更为接近均相成核时的亚稳区.将描述均相成核的经典成核理论应用于第3亚稳区的计算,得到了用其它方法很难得到的固液界面张力σ、临界核半径r及临界核所含溶质分子数i.     

利用最大泡压法研究扩散控制的溶液表面吸附动力学

In studying the diffusion-controlled adsorption kinetics of aqueous surfactant solutions at the air/solution surface by means of the maximal bubble pressure method, Fick's diffusion equation for a sphere should be used. In this paper the equation was solved by means of Laplace transformation under different initial and boundary conditions. The dynamic surface adsorption (t) for a surfactant solution, which was used to describe the diffusion-controlled adsorption kinetics at the solution surface, was derived. Different from the planar surface adsorption, the dynamic surface adsorption (t) for the short time consists of two terms: one is the same as WardTordai equation and the other reflects the geometric effect caused by the spherical bubble surface. This effect should not be neglected for the very small radius of the capillary. The equilibrium surface tension γeq and the dynamic surface tension γ(t) of aqueous C10E6 [CH3(CH2)9(OCH2CH2)6OH] solution at temperature 25°C were measured by means of Wilhelmy plate method and maximal bubble pressure method respectively. As t → 0, the theoretical analysis is in good agreement with experimental results and the dependence ofγ(t)on(√t r0/√πD)2 is linear.