| 查看: 1078 | 回复: 7 | |||
| 本帖产生 1 个 翻译EPI ，点击这里进行查看 | |||
[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
航天502所 高瑛珂博士 婚内征婚 欺骗女性开房
已经有15人回复
-
投稿文章被秒拒了
已经有5人回复
-
地球科学部D01口青年基金，最低几A几B几C才能有几率中呀。
已经有3人回复
-
招收2026级博士生
已经有6人回复
-
宿州学院学报
已经有5人回复
-
博士申请
已经有5人回复
-
西安交大新媒学院副院长用撤稿论文结题
已经有7人回复
-
论文撤稿了
已经有9人回复
-
化学专业申博
已经有5人回复
» 抢金币啦！回帖就可以得到:
-
浙江大学医学院附属妇产科医院张霈婧课题组招科研助理——生物信息方向
+2/110
-
想了解filecode的，看我这里
+5/90
-
【专业EPR】：自由基(超氧、羟基、单线态氧)，空位缺陷；定量计算，VX: 761711562。
+1/89
-
【通知】北京信息科技大学仪器科学与光电工程学院招收博士研究生（2026）
+1/84
-
Polymers期刊特刊Polymeric Materials for Advanced Drug Delivery组稿
+1/83
-
江苏大学优青 胡兴好教授课题组博士后招聘
+1/80
-
湖南师范大学（211，双一流）-有机化学-申请审核制博士招生
+1/35
-
大连工业大学杰青/长江团队-生物质材料-储能电池方向招收2026级博士生
+1/34
-
双一流大学湘潭大学“化工过程模拟与强化”国家地方联合工程研究中心招收博士生
+1/30
-
博士申请
+1/25
-
浙江理工大学国家级高层次人才团队招收能源光电催化材料方向博士生(截止5月31号)
+2/24
-
吸波粉体电磁参数模具加工
+1/8
-
哈尔滨工业大学/院士团队招收 硕士、博士
+1/8
-
上海交通大学化学化工学院张智涛课题组诚聘博士后
+1/6
-
电子科技大学材料学院SFT创新中心招收准备考研和读博的科研助理 理工医交叉方向
+1/6
-
深圳大学材料学院“智能分子材料团队”招聘博士后（连续流微反应器方向优先）
+1/5
-
电子科技大学材料学院SFT创新中心招收准备考硕和读博的科研助理 理工医交叉方向
+1/4
-
【有偿访谈招募】高才通来港后，你过得还好吗？
+1/2
-
中山大学-柔性电子方向-博士研究生招生
+1/2
-
固体核磁测试求助
+1/1
2楼2011-02-12 21:33:29
3楼2011-02-12 21:34:37
4楼2011-02-12 21:53:23
5楼2011-02-13 07:57:57
6楼2011-02-13 08:52:50
|
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
lidan0123(金币+5, 翻译EPI+1): 2011-02-14 08:18:13
lidan0123(金币+5): 2011-02-14 08:19:00
lidan0123(金币+5): 2011-02-14 08:19:00
|
指纳米磁流体收集前！ 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. 在此过程中，纳米粒由水相转入有机相，形成纳米磁流体。在纳米磁流体收集前，在分液漏斗中用蒸馏水进行清洗除去未磁化的纳米粒！ |
8楼2011-02-13 17:47:01