The optimum preparation conditions and the predicted quantitative equation have been obtained , which can be used to prepare starch microgel with smaller size and narrower size distribution 进一步通过均匀设计逐步回归法得到了制备平均粒径较小、粒度分布窄的淀粉微凝胶的优化工艺条件和预测定量方程。
The formaldehyde ( hcho ) was used as the reducing agent and plating was carried out at normal temperature and ultrasonic radiation . the ingredients of solution were determined by chemical analysis 平均粒径为10 20mn的al _ 2o _ 3粉体经过预处理使表面具有催化活性后，用甲醛作为还原剂在室温及超声波条件下镀银。
The microstructure , granularity and morphology of the product were characterized by epma - 1600 . epma - 1600 studies showed that the ultra - fine active zinc oxide was spherical structure with distribution and granu 结果表明：超细活性氧化锌的形貌为球形，且分散均匀，粒度均匀，其平均粒径为100nm ，比表面积为41m ~ 2 g 。
The tem and eds measurements indicated that it is mainly due to the high dispersibility and small diameter of the pt - ru particles in the pt - ru / c catalyst prepared with the solid phase reaction method Tem和eds的测量表明，这主要是由于用固相反应方法制得了pt - ru c催化剂中的中文摘要k r的分散度好，平均粒径4 、的缘故。
After 20 milling cycles , the particle size of pa6 can be reduced from original 3 - 4mm to around 1 m . some particles even reached nano scale ( 40 - 80nm ) after 30 milling cycles . pan - milling has great influence on polymer structure 经过20次碾磨循环，初始粒径为3 4mm的尼龙6粒子平均粒径可减少到3 m左右，经过30次碾磨循环，部分粒子粒径甚至可达纳米级( 40 80nm ) 。
Dense microstructure was detected in the pmzn piezoelectric ceramics with the sol - gel method synthesized pzt and the sol - self - combustion method synthesized pzt as matrix respectively , exhibiting homogeneous grain sizes less than 1 u m 而且采用溶胶-凝胶法和溶胶-自燃烧法合成的pzt为基体制备的pmzn压电陶瓷具有完全的四方相钙钛矿结构、烧结致密度较好、晶粒分布均匀、平均粒径在1 m以下。
It was found that the zeta potential and average size of the colloidal particles increase earlier and drop later with the addition of sec - buoh and both of them reach the maximal values which are 790nm and 20mv respectively when the mol ratio between sec - buoh and asb is 30 结果表明，胶体颗粒的平均粒径和zeta电位随异丁醇的增加先升高后下降，当沉积时间为1h时，异丁醇asb为40时膜的厚度最佳。
The spherical paam beads with average size diameter 111 . 8um and average pore diameter 119 . 8nm were obtained and can be used as ldl adsorbent ' s matrices . compared with the import product , the paam beads synthesized by our lab are costeffective 按此配方合成的聚丙烯酰胺微珠呈规则的球形，平均粒径为111 . 8 m ，平均孔径为119 . 8nm ，这些均符合ldl吸附剂载体的要求(粒径为100 200 m 、平均孔径为100 200nm ) 。
3 . for encapsulated pcms with less than 10 m in their average diameter , their temperature and heat of phase transition seldom change as their average diameter decreasing ; however , their crystallization peaks vary dramatically and the super - cooling becomes worse 3 、对于平均粒径小于10 m的相变材料胶囊，胶囊的相变温度以及相变热基本不随粒径变化，而结晶峰变化较大，其过冷现象随着粒径的减小而加剧。
( 2 ) the size reduction of iron particulates is caused by stretching , compression , developing of microcracks and fragmentation during pan - milling . tem shows that a part of the iron particles gets down to 40 ~ 120nm in dimension after 25 cycles of milling is offered 聚丙烯和铁共碾磨30次后，复合粉体的平均粒径为9 . 6微米； pp fe共碾磨25次后，铁的晶粒尺寸减小为22nm ，刚性材料铁对pp的粉碎具有助磨作用。
