pH值对ZrO2超细粉体料浆性能的影响

研究了不同pH值时超细ZrO2粉体料浆的Zeta电位、沉降速度和粘度等性能.测试了加入柠檬酸三铵作分散剂和A型分散剂(聚丙烯酸盐)以及不加分散剂时料浆的Zeta电位,结果证明采用A型分散剂分散效果最好,在pH=10.53时Zeta电位具有最大负值-44.28mV,研究了不同pH值时料浆的沉降情况,在pH=10.55时料浆沉降速度最慢,同时研究了pH值对料浆粘度的影响,在pH=10.66时料浆粘度最低.料浆呈现出剪切变稀特性,在pH值为10～11范围内,成型的坯体网络结构稳定,最大弯曲强度达到53.90MPa.     

二2-(2'-吡啶基)苯并咪唑一水合锌(Ⅱ)配合物的合成和结构表征

采用水热法合成了新配合物二2-(2'-吡啶基)苯并咪唑一水合锌(Ⅱ)配位聚合物{[Zn(L)2·H2O]}n(1),[L=2-(2'-吡啶基)苯并咪唑],用元素分析、红外光谱和X射线单晶结构等进行了表征,结果表明该配位聚合物属于单斜晶系,P21/c空间群.晶胞参数为:a=1.25188(19) nm,b =1.30095(19) nm,c=1.3300(2) nm,β =102.676(3)°,F(000) =968,Dc=1.483 g · cm-3,V=2.1133(5) nm3,Mr=471.81,Z=4,μ=1.192 mm-1,R1=0.0539,wR2=0.0819.该配位聚合物晶体是由配位水与苯并咪唑上的氮原子形成氢键以及配体2-(2'-吡啶基)苯并咪唑之间的π-π堆积作用连接而成的无限延伸的一维链状结构.     

Chemical Modification of EVA for DrugRelease Application

ＣｈｅｍｉｃａｌＭｏｄｉｆｉｃａｔｉｏｎｏｆＥＶＡｆｏｒＤｒｕｇＲｅｌｅａｓｅＡｐｐｌｉｃａｔｉｏｎＨＵＹｕｎ－ｈｕａａｎｄＺＨＵＯＲｅｎ－ｘｉ（ＤｅｐａｒｒｍｅｎｔｏｆＣｈｅｍｉｓｔｒｙ,ＷｕｈａｎＵｎｉｕｅｒｓｉｔｙ,Ｗｕｈａｎ,４３００７２）（...     

Study on Pair Correlation Energies of Isoelectronic Systems F~-,HF and H_2F~+

IntroductionAsawell knownfact ,thecalculationofelectroncor relationenergyisabottleneckprobleminthecalculationsofmolecularpropertiesandchemicalreactionsinquantumchemistry .1Ithasattractedgreatattentionoftheoreticalchemists.NumerousdifferentmethodshavebeenusedtocalculatethecorrelationenergysinceL wdin2 givethedef initionofelectroncorrelationin 195 9.In 196 0s ,Sinanoˇglu3,4 definedtheexactelectronpaircorrelationen ergyanddevelopedmany electrontheoryofatomsandmoleculesinwhichthetotalcorrelation…     

高能偏振能量色散X射线荧光光谱法分析古陶瓷

以国家地质标准样品制作工作曲线,用粉末压片法制样,高能偏振能量色散X射线荧光光谱法测定古陶瓷中包括15种稀土元素在内的56种元素,通过对6个陶瓷胎标准样品分析,结果表明:钪、钒、锰、铬、锌、镓、锗、铷、锶、钇、锆、铌、镉、锡、铯、钡、镧、铈、镨、钕、钆、钬、铒、铥、镱、镥、钍、铀等28种痕量元素测定值均在参考值的不确定度3～4倍范围,其他痕量元素如镍、铜、钼、锑、钐、铕、铽、铪、铅、铋等10种元素合格率为50%～83%。钠、镁、钾、钙、铁的氧化物和钛等6个项目均在允许误差范围内。氯、硫、磷的合格率均为66.6%。二氧化硅和三氧化二铝测定值和波长色散X射线荧光光谱熔融法测定结果相比,绝对误差分别在0.95%～4.46%和0.60%～1.66%之间。     

直流辉光放电质谱法测定多晶硅中关键杂质元素的相对灵敏度因子

采用直流辉光放电质谱(dc-GD-MS)测定多晶硅中关键杂质元素的相对灵敏度因子(RSF).标样制作过程中主要是在连续通入氩气条件下将固定量的非标准多晶硅样品熔化,向硅熔体中均匀掺入浓度范围为1～30 μg/g的关键杂质元素(如B和P),采用快速固化法制成标样;再将制成的标准样品加工成一系列适合GD-MS扁平池(Flat Cell)的片状样品(20 mm×20 mm×2mm).采用二次离子质谱法(SI-MS)对标准样品中关键掺杂元素进行多次定量测定,取平均值作为关键杂质元素的精确含量.优化一系列质谱条件后,运用GD-MS对标样中关键掺杂元素的离子强度进行多次测定,计算平均结果,得到未校正的表观浓度,利用标准曲线法计算出关键杂质元素的相对灵敏度因子.     

基于层层组装钴铝水滑石/聚电解质包裹碳纳米管的无酶葡萄糖传感器

采用共沉淀法合成了钴铝水滑石(CoAl-LDH),将CoAl-LDH与PSS包裹的CNTs(CNTs@PSS)通过层层自组装法构筑CNTs@PSS/CoAl-LDH多层膜电极,并将其应用于葡萄糖的分析测定。X射线衍射光谱、红外光谱和SEM表明:共沉淀法合成的CoAl-LDH具有典型的水滑石特征峰及形貌。电化学阻抗谱表明:CoAl-LDH可与CNTs@PSS均匀有效地组装构筑多层膜。电化学研究表明:CNTs的引入很好地提高了CoAl-LDH修饰电极的灵敏度。研究结果表明该传感器对葡萄糖在3.0×10-6～4.98×10-4mol/L范围内呈良好的线性响应,灵敏度为1.03×10-3A.L/mol。     

X射线荧光光谱分析

评述了我国在2000年7月-2002年6月间X射线荧光光谱，包括粒子激发的X射线光谱的发展和应用，内容包括仪器研制、激发源、探测器、软件、仪器改造、仪器维护和维修、样品制备技术、分析方法研究和应用。     

The Reaction of Japanese Reagent with Aminoacetamide with Alkyl Group

2,4-Bis(4-methoxyphenyl)-1,3,2,4-dithiadiphosphetane-2,4-disulfide¹,commonly known as Lawesson's reagent (LR,1a),and Japanese Reagent (1b),are not only thiating agent for diverse carbonyl compounds^1-3, but also they undergoes ring-closure reactions with contain substrates containing two functional groups to give phosphorus heterocycles which contain phosphonothioyliene {C₆H₄-P(S)〈} moiety. These heterocyclic compounds are of potential interest as herbicides,insecticides,and fungicides^4,5. Glycinamides are known as biologically active materials, for example, herbicides, plant-growth regulator⁶. In order to look for potent herbicides⁷ and to extent the use of Japanese Reagent to other bifunctional substrates,its reactions with 3-alkyl-glycinamides 2 have been investigated and found to give new phosphorus heterocycles which possess Significant selective herbicidal activity against rape. Here are our results.     

Study on the Reaction of Tricovalent Chlorophosphines with Aldehydes Containing Withdrawing Electron Groups

α-Polychloroalkyl phosphoric dichlorides and their derivatives 2,3,4 has insecticidal activity^1-4 and may be used as an intermediate to make other insecticides by reaction with alcohol, phenol, thiophenol or mercaptan. They can be prepared by various conventional methods of preparing phosphorus thioesters. Here we wish to report the addition reaction of tricovalent chlorophosphines with aldehydes containing withdrawing electron groups and its application in preparing of polychloroalkyl phosphorus dichlorides and their derivatives. The process can be represented by the following equation.