纳米红色硒粉在乙二醇介质中的分散工艺研究

针对含纳米红色硒粉抗菌保健不锈钢餐具的开发问题,为制备高分散性和悬浮稳定性的纳米硒粉,本文在测定纳米硒粉在乙二醇介质中pH-zeta电位图的基础上,选用CTAB、PVP、PEG-2000和Span80四种表面活性剂,采用吸光度测试、沉降实验研究了纳米硒粉在乙二醇介质中的分散工艺及其悬浮稳定性,并探讨了不同表面活性剂的分散机理。结果表明,在最佳配比下的CTAB与具有空间位阻稳定机理PVP和PEG-2000的复合分散体系的分散效果明显好于单分散剂,其中,PVP与CTAB的复合分散比最佳单分散剂CTAB的分散效果提升了105%;推荐纳米硒粉在乙二醇中的分散工艺为:在pH=6、3%(质量比)CTAB+3%PVP复配分散,分散时间为10 min,该工艺下分散的纳米硒粒子静置60天的沉降率仅为0.7%。红外测试表明,CTAB在纳米硒粉表面为物理吸附,PVP、PEG-2000和Span80则为化学吸附。

Dispersion of Nanoparticles of Red Selenium in Glycol Medium: An Experimental Study

We addressed the dispersion of Se-nanoparticles,an advanced antibacterial material and synthesized via chemical route.The influence of the mono-surfactants,including CTAB,PVP,PEG-2000 and Span80,on the stability of dispersion/suspension of Se-nanoparticles in ethylene glycol was investigated.The results show that the composite surfactants outperform any mono-surfactant.To be specific,CTAB/PVP(or PEG-2000) composite dispersants,mixed with optimal ratio,dispersed the Se-nanoparticles better than any mono-dispersant did.For instance,when it comes to nano-particle dispersion,the CTAB/PVP composites were 105% more effective than that of the best dispersant CTAB.The optimized dispersion conditions were suggested to include:a pH value of 6,a composites of 3%(wt)CTAB and 3%PVP,a dispersion time for 10 min.Stored in air for 60 d,the sedimentation rate was 0.7%.PVP,PEG-2000 and Span80 were chemisorbed and CTAB was physically adsorbed on Se-nanoparticle surfaces.