Freeze - drying process develops as a technique for biological pharmacy and later as a means for the preservation of foods 摘要冷冻干燥技术最早应用于生物制药和食品加工。
In view of the advantages such as simple equipment and less energy , the former would become a new freeze - drying technology and be worth further studying and developing 由于前者具有设备简单、能耗低等优点，可能成为一种新型冷冻干燥技术而具有研究开发的价值。
Vacuum freeze drying has a great impact upon the production of dehydrated foods because of the superior quality of the product obtained and promises continuous expansion of the number of applications 真空冷冻干燥技术已在许多领域得到了广泛的应用，将该技术用于食品加工可获得高质量的脱水食品。
In this paper , the development of vacuum freeze drying technology is reviewed and the importance and necessity of decreasing drying time and reducing energy consumption are expounded in detail 本文首先在综述真空冷冻干燥技术发展现状的基础上，阐述了降低真空冻干能耗和缩短冻干时间的必要性和重要性。
The high temperature exothermic peak of nh4clo4 added 5wt % and 10wt % is respective 63k and 130k lower than the pure nh4clo4 . the “ segregation of solute model ” is established and discussed 添加5wt %和10 % wt冷冻干燥技术制备的超细镍粉的高氯酸铵,它们的高温分解放热峰温度分别比纯的高氯酸铵降低了63k和130k 。
Recently , as an advanced and eco - friendly method of powder preparation , freeze - drying has been developing quickly . the ultrafine ni powder with the average size of 50nm was prepared by freeze - drying form the niso4 and naoh and was studied by means of xrd , ir , fesem , tem , and dsc . the catalysis of nickel powders to nh4clo4 and how the precursor forms and the processes of the amorphous precursor to the final nickel powders are discussed 本论文以分析纯niso4 、 naoh为原料,采用冷冻干燥技术成功的制备了50nm左右的球状超细镍粉,通过xrd 、 ir 、 fesem 、 tem 、 dsc等材料现代分析手段对产物进行了分析和表征,研究了超细镍粉对高氯酸铵热分解的催化活性、前驱体的形成以及非晶态金属盐到晶态超细镍粉的转变过程。
