摘要
为了降低纳米Al2O3粉体的表面活性,充分发挥其纳米性能,通过黏度和沉降试验定性地表征了柠檬酸三钠在Al2O3粉体上的吸附情况,并且用紫外-可见分光光度计研究了在pH=10时柠檬酸三钠在纳米Al2O3粉体上的定量吸附情况,测量波长为198nm。用透射电镜观察吸附前后的形貌。结果表明:当浆料的pH=10时,柠檬酸三钠在纳米Al2O3粉体上的吸附满足Langmuir单层吸附,最大吸附量为1.583mg/mL,此时,柠檬酸的量相对于Al2O3粉体为2.5%,恰好黏度最低,沉降速度也最小,即胶体的稳定性和吸附性同时达到最佳。
In order to reduce surfacation active of nano-alumina, make full use of its nano advantage, adsorption characteristic of sodium citrate on nano-alumina was analyzed qualitatively by sedimentation and viscosity experiments. And adsorption quantity of sodium citrate on nano-alumina was measured under pH = 10 by UV spectrum. The wavelength was 198nm. Adsorption images were observed by TEM. The results show that adsorption behaviors accord with langmuir monolayer adsorption. The maximum of adsorption is 1. 583mg/mL. When pH value is 10 and the amount of sodium citrate relative to nano-alumina is 2.5 percent, the viscosity and the sedimentation velocity can get the lowest value. That is to say, stability and adsorptive capability reach optimal effect, together.
出处
《表面技术》
EI
CAS
CSCD
2007年第4期22-24,共3页
Surface Technology
基金
教育部"春晖计划"
2004年教育部"新世纪优秀人才支持计划"(NCET-040263)
