超细微粒 meaning in Chinese

ultrafine dust
ultramicron

Progress in supercritical fluid precipitation technology used for preparation of microparticles
制备超细微粒的超临界流体沉淀技术新进展
Study and application of the extraction of proteins and preparation of ultrafine particles by reverse micelle
反胶团法在蛋白质萃取及超细微粒制备方面的研究进展
M . h . rei , l . l . sheu , and y . z . chen , “ nickel boride catalyst in organic synthesis . i : a new ferromagnetic catalyst from the diborane reduction of nickel acetate ” , appl . catal . , 23 ( 1986 ) 281
陈懿,范以宁,沈俭一,胡徵, “非晶态合金超细微粒催化剂制备?表徵和催化作用的研究” ,超细微粒材料与触媒研讨会论文集, ( 1996 ) 1