丙烯酸环己酯的合成研究

以丙烯酸和环己醇为原料合成丙烯酸环己酯,考察了不同催化剂、阻聚剂用量、催化剂用量、醇酸比及反应时间对丙烯酸转化率和选择性的影响,得到的最佳工艺条件为：催化剂为甲基苯磺酸,用量为1%,醇酸比为1.5,阻聚剂为3‰,带水剂用量为5%,丙烯酸转化率大于90%,选择性大于80%.     

硫酸催化甲酯化气相色谱法测肥皂产品中的脂肪酸分布及总脂肪物含量

气相色谱法-FID检测器测定产品的脂肪酸分布及平均分子量。用硫酸催化甲酯化肥皂产品中的脂肪酸,红外光谱法定性监测甲酯化产物。采用正己烷提取并富集甲醇溶液中的反应产物。采用外标法定量。用标准加入法测得方法的回收率在93.4%～103.8%之间,相对标准偏差（n=6）在3.6%～5.1%之间。用气相色谱测试数据计算推导可以获得肥皂中的总脂肪物含量。     

两性表面活性剂椰油酰胺丙基甜菜碱(CAB)胶束对四氮杂大环铜催化的B-Z振荡体系的影响

研究两性表面活性剂椰油酰胺丙基甜菜碱(CAB)浓度在2.0×10-5到1×10-3mol/L范围对苹果酸-溴酸钠-[CuL](ClO4)2(L为5,7,7,12,14,14-六甲基-1,4,8,11-四氮杂环十四-4,11-二烯)-硫酸组成化学振荡体系的影响。     

溪黄草多糖含量的测定

实验模拟泡茶方式浸取得溪黄草的水提样品溶液,并用苯酚硫酸法测定了样品溶液的多糖浓度,计算了溪黄草的多糖含量,为3.72%,为科学服用溪黄草提供了客观依据.     

阿魏酸的荧光光谱与荧光量子产率

在酸性条件下,阿魏酸荧光强度随pH值的升高而增大,荧光峰的最大激发和发射波长分别为310 nm和415 nm。在碱性条件下,最大激发波长和发射波长红移到350 nm和460 nm处。随着pH值的升高,其荧光强度逐渐增大,当pH值大于10.0时,其荧光强度达到最大值且趋于稳定。阿魏酸的荧光光谱随pH值的变化是由于其分子中羧基和羟基质子的离解。以硫酸奎宁为参比,测得阿魏酸水溶液的荧光量子产率为0.006 1。     

中药金芎原植物的研究

 A comparison of morphology, karyotype and the chemical compounds among “Jinxiong”, Ligasticum chuanxiong Hort. and L. chuanxiong cv. Fuxiong shows that “Jin- xiong”, like L. chuanxiong cv. Fuxiong, is a triploid and its karyotype is similar to that of L. chuanxiong with the formula K(2n)=33=24m+6sm+3st(SAT).   Thin-layer chromato- graphy of essential oils extracted from stem tubers confirms that the three taxa are extremely alike in chemical compounds. Using the features of leaves and the forms of stem tubers, they can be easily distinguished.  A new triploid cultivar of L. chuanxiong Hort. i.e.L. chuan-xiong cv. Jinxiong   is described for “Jinxiong” in the present paper.     

制糖生产过程中磷酸测定影响因素的探析

研究磷酸标准色液在不同显色时间的吸光度,探讨使用钼酸铵比色法测定磷酸含量中显色时间对测定结果准确性的影响。研究结果表明,显色时间对钼酸铵比色法测定磷酸含量的准确性有显著影响,当显色时间达50min时,样液的吸光度稳定,表明在22±0.5℃环境下,磷酸盐与钼酸铵反应需要50m in。     

离子液体BMIMPF6与乙酸二元混合液的密度和体积性质

利用测得常压下298.15～318.15 K温度全浓度范围的混合液密度,计算BMIMPF6和乙酸溶液的超额摩尔体积和无限稀释超额偏摩尔体积,两者均为负值,并表现出良好的一致性。用Redlich-Kister方程拟合混合液的超额摩尔体积与组分浓度关系,最大标准偏差低于0.005 cm3·mol-1.利用Flory统计理论讨论了二元混合系体积随温度的变化规律,结果表明理论分析与实验结果具有较高的吻合度;用离子液体中离子与有机分子间存在着离子-偶极作用和结构效应解释了实验现象。     

Development of a miniature silicon wafer fuel cell using L-ascorbic acid as fuel

In the current studies a miniature silicon wafer fuel cell （FC） using L-ascorbic acid as fuel was developed. The cell employs L-ascorbic acid and air as reactants and a thin polymer electrolyte as a separator. Inductively coupled plasma （ICP） silicon etching was employed to fabricate high aspect-ratio columns on the silicon substrate to increase the surface area. A thin platinum layer deposited directly on the silicon surface by the sputtering was used as the catalyst layer for L-ascorbic acid electro-oxidation. Cyclic voltammetry shows that the oxidation of L-ascorbic acid on the sputtered platinum layer is irreversible and that the onset potentials for the oxidation of L-ascorbic acid are from 0.27 V to 0.35 V versus an Ag/AgCl reference electrode. It is found that at the room temperature, with 1 mol/L L-ascorbic acid/PBS （phosphate buffered solution） solution pumped to the anode at 1 ml/min flow rate and air spontaneously diffusing to the cathode as the oxidant, the maximum output power density of the cell was 1.95 mW/cm^2 at a current density of 10 mA/cm^2.     

Kinetics of 2,4-dichlorophenol dechlorination by Pd-Fe bimetallic nanoparticles in the presence of humic acid

The remediation of groundwater which contains chlorinated organic compounds （COCs） by nanoscale bimetallic catalysts has received increasing interest in recent years. This report presents the dechlorination of 2,4-dichlorophenol （2,4-DCP） by Pd-Fe bimetallic nanoparticles in the presence of humic acid （HA） to investigate the feasibility of using Pd-Fe for the in situ remediation of contaminated groundwater. Our experimental results indicated that HA had an adverse effect on the dechlorination of 2,4-DCP by Pd-Fe nanoparticles. The rate constant k values of 2,4-DCP dechlorination were 0.017, 0.013, 0.009, 0.006 and 0.004 min^-1 for HA concentrations of 0, 5, 10, 15 and 20 mg/L, respectively. The relationship between HA dosage and k values can be described as a linear model.