| 查看: 1024 | 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. |
回复此楼» 猜你喜欢
博士自荐
已经有3人回复
-
083200 初试305分 求调剂
已经有4人回复
-
292求调剂
已经有5人回复
-
22408 270分
已经有8人回复
-
一志愿2110，化学学硕310分，本科重点双非求调剂
已经有15人回复
-
070300化学学硕311分求调剂
已经有20人回复
-
085400 328分 求调剂
已经有4人回复
-
085801 总分275 本科新能源 求调剂
已经有8人回复
-
0854调剂
已经有6人回复
-
280求调剂
已经有8人回复
» 抢金币啦！回帖就可以得到:
-
江西科师大招收与湖南大学联合培养学硕1名
+1/497
-
半导体加工服务
+1/99
-
江西科技师范大学物理化学课题组招生，07,08都可，还有名额
+1/91
-
江西理工大学碳纳米材料与柔性能源器件团队招收2026年新能源方向调剂生
+1/88
-
2026 硕士研究生调剂｜河南工业大学化学化工学院名额开放
+2/48
-
河南工业大学化学化工学院 2026 年硕士调剂火热正在进行中
+1/41
-
上海应用技术大学招收化学、物理、材料类调剂生
+1/40
-
河南中部某本科高校 资源与环境（专硕）研究生 招生信息
+1/37
-
大湾区大学李红庚课题组招聘研究助理
+1/37
-
中南林业科技大学材料“科学与工程硕士点（学硕）”贺梦冬课题组招收调剂生
+1/22
-
岭南师范学院生物与医药专业（生物技术与工程领域）2026年调剂公告
+1/21
-
东北大学李亦庄教授招收2026年博士生和科研助理
+1/20
-
大连工业大学 高分子材料 接收考研调剂
+1/16
-
南华大学招收调剂生，[085700]资源与环境—环境工程方向
+1/11
-
三峡大学材化学院化工新材料课题组现招收化学或者化工、材料硕士研究生2名
+5/10
-
河南农业大学化学学硕（13人），材料与化工专硕（12人），欢迎考生调剂
+1/9
-
福建理工大学招收专业代码08开头学术型硕士研究生
+1/5
-
全国重点实验室调剂
+1/5
-
台州学院接收化学、化工与材料方向调剂
+1/3
-
江西农业大学动科院“昆虫-共生菌协同进化”方向招收调剂研究生
+1/1
|
其实主要只有一段话不明白，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. Prior to its collection不知道指的是什么，前后的逻辑关系不是很明白，其他的我还是能看明白的。第一次求助翻译，不知道多少金币翻译多少字合适，我想既然求助了，就粘过来了 |
7楼2011-02-13 09:24:55
2楼2011-02-12 21:33:29
3楼2011-02-12 21:34:37
4楼2011-02-12 21:53:23
