The preparation of the positive electrode materials was done in the solution at low temperature . on the same conditions , the perfect spinel - structure limn2o4 can be synthesized using the citrate complex method , especially by improving technics , the nanometer and sub - micrometer sample was synthesized with fine crystallization , averaging crystal grain and composing , that is hopeful for electrode application 在同样的反应条件下，利用柠檬酸配合法制备出的正极材料具有颗粒均匀、组成均一的优点，尤其是改进工艺，采用无水乙醇二次研磨后连续焙烧出的纳米?亚微米量级的limn _ 2o _ 4结晶度高，颗粒适中，结构完美，有望成为优良的正极材料。
The dual - bath coagulation method suggested by j . a . va n ' t hof could be used in membranes with high selectivity clearance rate of low - molecular weight substances and moderate water flux theoretically . therefore it may be applied in the field of hemofiltration . to improve and optimize the performance of the pes ultrafiltration membrane applied in the hf , here the flat membranes and hollow fiber ( hf ) membranes are made in certain conditions based on the dual - bath coagulation method where pes is used as the membrane material , dmso as solvent and pvp & peg as additives this paper includes five parts as follow : 1 为了改善和优化聚醚砜超滤膜(单浴法)在血液过滤实际应用中的性能，本论文以j . a . van ' thof等提出的双凝固浴法为基础，以聚醚砜( pes )为主要成膜材料，以二甲基亚砜为溶剂，并添加一定分子量的致孔剂( pvp ，聚乙烯吡咯烷酮)以及一定分子量的添加剂( peg ，聚乙二醇)按照一定配比在一定温度下制成透明均一的铸膜液，静置脱泡后在一定的工艺条件下制成聚醚砜平板膜和中空纤维膜，然后通过测试膜的结构和性能来评估其用于血液过滤中的前景。
Nanomaterial is the one of new material that now most gets solicitude , its important meaning is more and more known for people to share . research and the preparation of nanomaterial are the foundation of nano - st . as nanotechnology is continuously developed has put forward higher requirement for the preparation of nanopowder : need to prepare the various , shape look and structure that specifies size and equality the adjustable nanometer pellet to support application and development 纳米材料是目前最受关注的新材料之一，其重要意义越来越为人们所共识，纳米材料的制备和研究是整个纳米科技的基础，随着纳米应用技术的不断深入以及基础理论研究的不断加强，对纳米粉体的制备提出了更高的要求：即需要制备出各种特定尺寸、均一的、形貌、结构可调控的纳米颗粒来支持应用与开发。
