| 查看: 1114 | 回复: 7 | |||
| 本帖产生 1 个 翻译EPI ,点击这里进行查看 | |||
| 当前只显示满足指定条件的回帖,点击这里查看本话题的所有回帖 | |||
[交流]
关于化学实验的翻译求助
|
|||
|
2.1. Synthesis of cobalt ferriteCoFe2O4 (sample CFO) was synthesized by chemical coprecipitationby the following procedure. A 0.2 M solutionwas prepared by dissolving Co(NO3)26H2O (A.C.S.reagent, Aldrich) and Fe(NO3)39H2O (puriss, Fluka) in deionized water. The precipitating agent was a 5 M NaOH(reagent grade, Aldrich) solution with 100% molar excess. Both solutions were heated separately to 65 C and thenmixed under constant stirring. The temperature was raised to 80 C for 20 min, to completely crystallize the spinel phase. The precipitate was centrifuged and thoroughly washed with distilled water. The cobalt ferrite was kept in a water suspension. One small portion was dried at 80 C for characterization. 2.2. Preparation of a ferrofluid The cobalt ferrite/water suspension was heated to 80 C under gentle stirring. Oleic acid (reagent grade, Sigma– Aldrich) was added to the suspension at 30 wt.% with respect to the cobalt ferrite. The temperature was raised to 90 C for 30 min and then cooled to 60 C. Octane (reagent grade, Sigma–Aldrich) was added and the mixture was stirred for another 30 min. During this process, the nanoparticles were transferred from the aqueous phase to the organic phase, thus forming the ferrofluid. Prior to its collection, the ferrofluid was washed with distilled water in a separatory funnel to remove the non-modified particles. A gravimetric study of a 2.5 g aliquot was carried out to determine the content of inorganic material in the ferrofluid by weight difference before and after calcination at 700 C. A sample of the surface-modified ferrite was reserved before the addition of octane to determine the amount of oleic acid that reacted with the particles. The sample was dried at 80 C before performing a thermogravimetric analysis on a TGA Q500 by TA Instruments, from room temperature to 700 C at 5 min1. 2.3. Synthesis of cobalt ferrite–barium titanate core–shelltype nanostructures Core–shell-like nanostructures of CoFe2O4–BaTiO3 were synthesized by the sol–gel technique. Ba(C2H3O2)2 (A.C.S. reagent, Sigma–Aldrich) was mixed with titanium (IV) n-butoxide (reagent grade, Sigma–Aldrich), stearic acid (95%, Sigma–Aldrich) and glacial acetic acid (Aldrich) at 90 C to form a sol. The ferrofluid was added to the sol at an adequate amount so that the final nanostructures have a content of 20, 30, 40, 50 and 60 wt.% of cobalt ferrite with respect to the barium titanate, namely samples Co20, Co30, Co40, Co50 and Co60, respectively. Anhydrous 2-methoxyethanol (Aldrich) was added to promote the gel formation. The obtained gels were dried overnight at 80 C and sintered at 700 C for 2 h under the following conditions: (a) heating rate of 1.8 C min1 from room temperature to 350 C; (b) heating rate of 1.5 C min1 from 350 C to 700 C and (c) cooling rate of 4 C min1 from 700 C to room temperature, to avoid cracking of the barium titanate, which is the shell in the nanostructures and is expected to be subjected to high stresses. One additional sample without ferrofluid was also prepared as a reference (sample BTO). All samples were washed with a 0.1 M acetic acid solution to dissolve impurities such as barium carbonate [18]. We note that if the stearic acid, glacial acetic acid and 2-methoxyethanol were omitted from the preparation, the resulting material consisted of a simple mixture of individual cobalt ferrite and barium titanate nanoparticles. |
» 猜你喜欢
分享一下我之前已中青C的计划书的filecode
已经有5人回复
不应该看fileCode
已经有8人回复
FileCode能看出啥?
已经有26人回复
关于Filecode分析方法
已经有11人回复
重要来源:本周末出结果
已经有9人回复
我的国基提前知道中了,可是同事的操作让我实在接受不了,怎么会有这样的人
已经有14人回复
结合人工智能,周易传统文化,filecode打分制来了,3分以上希望很大。
已经有4人回复
2019年青年基金涵评意见,大家看看几个A,几个B?
已经有11人回复
应该是93bebmhtak前后十一个字符比较关键
已经有36人回复
好奇怪的filecode
已经有6人回复
» 抢金币啦!回帖就可以得到:
2026年生物学、大数据与信息工程国际会议 (BSBIE 2026)
+1/606
北京信息科技大学机电工程学院硕士研究生招生线上宣讲会-8月16日
+5/330
武汉女征男
+2/202
真诚找女友
+1/186
国防科技大学空天科学学院招聘启事陶瓷基复合材料方向科研助理招聘
+1/88
中国科学院空天院精密干涉测量团队 精密机械结构工程师招聘启事
+1/85
中国科学院空天院精密干涉测量团队招聘光学/算法/机械方向博士后/特别研究助理
+1/82
别研究filecode了,祝都有一个好结果:)
+2/54
物理学报录用,散币感谢合作者和审稿人
+2/40
无机非金属材料科学相关 实习研发人员招聘
+1/31
天津大学环境学院童银栋教授招收博士后(生源要素循环/温室效应/新污染物方向)
+1/30
西北工业大学 生科院 秦绪军课题组诚招博士后、博士/硕士研究生【长期有效】
+1/14
同济大学环境学院肖倩课题组2026年补充招收推免生
+1/6
深圳理工大学招收生物医用高分子材料方向客座研究生
+1/6
北京理工大学-集成电路与电子学院杰青团队-招博士后
+1/6
关于Ghaffar-Parkins催化剂催化氰基水解为酰胺的问题
+1/6
27推免-广州医科大学封红亮教授招收精神医学应用心理学推免生
+1/5
海南大学化学院-科研助理招聘 (可读博,可与华中科技大学,天津大学联培)+博后招聘
+1/4
天津大学张小岩教授团队招收2027级推免生(光电子能源、热管理材料与器件、微纳传感)
+1/3
中国科学技术大学环境学院招聘招生
+1/2
4楼2011-02-12 21:53:23
2楼2011-02-12 21:33:29
3楼2011-02-12 21:34:37
5楼2011-02-13 07:57:57










回复此楼