化学专业英语5-experiment

Herein we demonstrated that …
专业英语课件
Part 6

Experimental
The format of an experimental section should be
in accordance with the requirement of the journal you choose.
一、原材料的来源及准备(Chemicals or Materials) 1. 直接买到的药品一般需指明来源和纯度：

Amino acid (Bachem), 2-(2-aminoethyl)pyridine (Fluka) and 2hydroxypyridine (Acros) were used as received.
The reaction mixture was stirred for 2h at room temperature. Precipitated triethylamine hydrochloride
salt was filtered off, and the filtrate was concentrated
synthesized
following a procedure described elsewhere.25 The product was recrystallized twice from
diethyl ether. White crystal was obtained in
55% yield: (mp 45°C). The 1H-NMR spectrum (4H, 4.50 ppm; 2H, 2.21 ppm) was consistent with that reported previously.25
published procedures [1].
二.实验过程
具体的实验步骤、条件、反应等则需要详细说 明,通常有如下的小标题:
a.
Preparation of …
b.
c. d.
… Synthesis
Synthesis procedure Reaction of …
Experimental
Synthesis of Cyclic Carbonate Monomer <小标题>

二.实验过程
研究对象为化学合成的产物要说明具体合成方法：
1.若参考已知的方法，此部分应指明合成方法的出处

…was prepared by the method of … [10]. …was synthesized according to Ref. [4].

…were synthesized according to
PVA is poly (vinyl alcohol) 聚乙烯醇

一、原材料的来源及准备(Chemicals or Materials)

All materials, such as potassium hexacyano-cobaltate (III) (K3Co(CN)6), zinc fluoride (ZnF2), zinc chloride (ZnCl2), zinc bromide (ZnBr2), zinc iodide (ZnI2) and tertiary butyl alcohol (tBuOH) were purchased from Aldrich and used without further purification.
1.实验预备：描述实验中所需要的化学原材料、试 剂的来源、预处理和纯化； 2.实验过程：描述实验(合成)的操作步骤、方法、 条件、现象和注意事项等； 3.结果表征：描述通过什么样的仪器、测试方法或 技术手段来获得支持论文观点的有效数据（经常指
对产品各种化学物理性质的表征）。
由于实验已经发生，通常用一般过去时被动态。
化学实验中使用的药品按照纯度的不同常可以分为： industrial grade 工业级 ； analytical grade 分析级 ； spectral grade 光谱级

一、原材料的来源及准备 (Chemicals or Materials) 3. 需经纯化处理的药品一般需说明纯化方法

Bisphenol A was recrystallized from chlorobenzene. Dichloromethane was distilled prior to use and stored 源自文库ver molecular sieves. Molecular sieves were activated at 350oC for 10 h under N2 before use.
HO N
2-hydroxypyridine
一、原材料的来源及准备(Chemicals or Materials)

The starting materials were Li3PO4 (99%, Aldrich) and Fe3(PO4)· 2O (99%, Aldrich). 8H An appropriate amount of PVA (degree of polymerization 1500, Junsei) as the carbon source was added to the raw materials.
chlorine —Cl2 bromine —Br2 iodine —I2

Polymerization grade of poly( tetramethylene ether glycol) (PTMEG, molecular weight =1800) was donated by BASF Korea Ltd.
H2N
N
2-(2-amino-ethyl)pyridine

ZnEt2 （diethylzinc）was purchased from Aldrich and was used as received.
Amino acid 氨基酸 amine 胺 ammonia 氨 Ammonium 铵 pyridine 吡啶

Generally, an experimental section mainly consists
three parts, that is:

Chemicals (Materials), Synthesis (preparation),
and Characterization
Experimental
Chlorobenzene 氯苯；Dichloromethane 二氯甲烷；molecular sieves分子筛

Ethyl acetate was dried over K2CO3 and distilled. All solvents were freshly distilled before use.
一、原材料的来源及准备(Chemicals or Materials) 2. 直接购买的普通溶剂或辅助药品只需简单提及或略 过

All other materials were commercially available and used as received unless otherwise noted. All other chemicals were of analytical grade and were used as received.

二、阐述目前该领域的研究现状﹑存在问题﹑ 待解决的问题

Although … has been investigated extensively, very few literatures reported …
However, … have so far not been studied. Unfortunately, the current method suffers from certain limitations. though, whereas, on the other hand, but … Thus, there is a need to …
专业英语课件
Part 5


Introduntion
一、介绍研究背景(background)﹑ 研究意义
二、阐述目前该领域的研究现状﹑存在问题﹑
待解决的问题

三、指出本文的研究内容﹑目的及其独到之处
Introduction
一、介绍研究背景(background)﹑ 研究意义

Since the early 1960s, …has attracted much attention due to … In recent years, more and more attention has been paid
under vacuum. The residue was recrystallized three
times from THF-ether.
Experimental
Synthesis of trimethylene carbonate <小标题>

Trimethylene
carbonate
was
Triethylamine (84.0 g, 0.825 mol) was added
dropwise to a solution of 1,3-propanediol (29.9 g,
0.393 mol) and ethyl chloroformate (85.4 g, 0.786
mol) in 2L of THF at 0 oC over a period of 30 min.


Introduction
三、指出本文的研究内容﹑目的及其独到之处

常用句式： In this paper, we present data on … Recently, we found that… In this paper … are discussed in detail. The present work was aimed at studying …
Experimental
Preparation of catalysts
A solution of ZnCl2 (220 mmol) in deionized water(115 mL) and tBuOH (21 g) is taken in the first beaker (solution 1). A solution of K3Co(CN)6 (3.15 g, 9.5 mmol) in deionized water (42 mL) is taken in the second beaker (solution 2). The third beaker contains a mixture of deionized water (1 mL), tBuOH (20 mL) and PTMEG (3.5 g) (solution 3). Solution 2 is added to solution 1 dropwise for a period of over 60 min at 50 oC with continuous stirring using a mechanical stirrer. Solution 3 is then added and the mixture is stirred for an additional 3 min. The mixture is then centrifuged. The resulting catalyst (DMC-Cl) cake is dried at 60 oC under vacuum (30 inHg) to a constant weight. The catalysts using ZnF2 (DMC-F), ZnBr2 (DMC-Br) and ZnI2 (DMC-I) were prepared by similar procedures.

to …

Very recently, it was reported that …


…have recently evoked a lot of interest.
It is well known that …is be of great interest because …
Introduction