微乳液法制备硫化银纳米颗粒及抗磨性能

Preparation and Antiwear Properties of Silver Sulfide Nanoparticles in Microemulsion

在两种W/O微乳液体系中制备了Ag_2S纳米颗粒,用透射电子显微镜(TEM)、X射线粉末衍射仪(XRD)对其形貌和结构进行了表征.结果表明,在异辛烷/油酸钠/正戊醇/水溶液和液体石蜡/Span 80-Tween 80/正丁醇/水溶液两种微乳液体系中所制备的Ag_2S纳米颗粒均具有单斜晶型结构,颗粒粒度分布均匀,无团聚现象,平均粒径分别为18和5nm.在四球长时抗磨损试验机上考察了分散于液体石蜡中Ag_2S纳米颗粒的抗磨性能,通过扫描电子显微镜(SEM)对钢球磨斑表面进行了形貌观测.结果显示,在液体石蜡/Span80-Tween80/正丁醇/水溶液体系中制备的Ag_2S纳米颗粒可以稳定分散在液体石蜡中,具有较好的抗磨性能,并且能显著提高基础油的承载力.

Ag2S nanoparticles were prepared in two different W/O microemulsions, the structure and morphologies of as-prepared Ag2S nanoparticles were characterized by means of X-ray powder diffraction （XRD）, transmission electron microscope （TEM）. The tribological properties of liquid paraffin containing Ag2S nanoparticles were evaluated on a four-ball test machine, the worn steel surface morphology were analyzed by using of scanning electron microscope （SEM）. Results show that Ag2S nanoparticles synthesized in two microemulsions, i.e. isooctane/sodium oleate/n-pentanol/water solution （sample Ⅰ ） and liquid paraffin/Span 80-Tween 80/n-butanol/water solution （sample Ⅱ ） both possess monocline crystal structure, and exhibit an even grain distribution. They have average particle size of 18nm and 5nm, respectively. The antiwear tests show that Ag2S nanoparticles dispersed in liquid paraffin processed from liquid paraffin/Span 80-Tween 80/n-butanol/water solution microemulsion exhibit good antiwear properties which can improve load carrying capacity of the base oil remarkably.