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...     

纸尿裤产品的质量风险监测分析

对四川省人口较多具有代表性的几个地区流通市场的纸尿裤(片、垫)进行随机抽样检测,并进行质量风险监测分析,对产品的渗漏性能、卫生指标和荧光性物质3项指标进行了检测。监测结果:纸尿裤风险检出率为64.0%,其中渗漏性能指标风险检出率所占比例为24.4%,风险等级为中等风险;卫生指标风险检出率所占比例为0,风险等级为低风险;荧光性物质指标风险检出率所占比例为75.6%,风险等级为严重风险。按照规定,最终确认此次纸尿裤风险监测的风险等级属于严重风险,风险主要来源于纸尿裤产品中存在的荧光性物质。     

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.