A vacuum ultraviolet photoionization mass spectrometric study of acetone

The photoionization and dissociative photoionization of acetone have been studied at the photon energy range of 8-20 eV. Photoionization efficiency spectra for ions CH3COCH3+, CH3+, C2H3+, C3H3+, C3H5+, CH(2-)CO+, CH3CO+, C3H4O+, and CH3COCH2+ have been measured. In addition, the energetics of the dissociative photoionization has been examined by ab initio Gaussian-3 (G3) calculations. The computational results are useful in establishing the dissociation channels near the ionization thresholds. With the help of G3 results, the dissociation channels for the formation of the fragment ions CH3CO+, CH2CO+, CH3+, C3H3+, and CH3COCH2+ have been established. The G3 results are in fair to excellent agreement with the experimental data.     

ADSORPTION OF 2,4-DICHLOROBENZOXYACETIC ACID ONTO HYPERCROSSLINKED RESIN MODIFIED BY PHENOLIC HYDROXYL GROUP (AM-1)

INTRODUCTIONAdsorption has been considered to be the best available technology for removing organics from water in the USSafe Drinking Water Act[1]. Due to many drawbacks of activated carbon[2-7], the most widely used adsorbent,hypercrosslinked polymeric adsorbents developed by Tsyurupa and Davankov[8] have been increasingly viewedas an alternative to activated carbon for selective removal of specific organic substances from contaminatedwater[9-12], and series of researches have been do…     

High-efficiency, environment-friendly electroluminescent polymers with stable high work function metal as a cathode: green- and yellow-emitting conjugated polyfluorene polyelectrolytes and their neutral precursors

A series of aminoalkyl-substituted polyfluorene copolymers with benzothiadiazole (BTDZ) of different content were synthesized by Suzuki coupling reaction, and their quaternized ammonium polyelectrolyte derivatives were obtained through a postpolymerization treatment on the terminal amino groups. Copolymers are soluble in environmentally friendlier solvents, such as alcohols. It was found that the efficient energy transfer occurs by exciton trapping on the narrow band gap BTDZ site under UV illumination. Only 1% of BTDZ content is needed to completely quench a fluorene emission for both the neutral and the quaternized copolymers in the neat film. Absolute PL efficiencies of copolymer films were greatly enhanced as a result of the suppression of excimer formation. Light-emitting devices fabricated from these copolymers show high external quantum efficiencies over 3% and 1% for the neutral precursor and the quaternized copolymers, respectively, with high work function metals such as Al as a cathode. To the best of our knowledge, this is the first report on an electroluminescent polymer which bears the high EL efficiency, the electron-injection ability from high work function metals, and the solubility in environment-friendly solvents at the same time. These features make them a promising candidate for the next generation of light-emitting copolymers in PLED flat panel display application.     

水溶性含C_(60)聚电解质的制备及其与重氮树脂自组装膜AFMFFM的初步研究

通过BPO引发的溶液聚合 ,合成了水溶性的星状C6 0 苯乙烯 苯乙烯磺酸钠的三元共聚物 [Star shapedC6 0 poly(St SS) ],运用自组装技术 ,在水溶液中 ,含C6 0 的三元共聚物与重氮树脂 (Diazoresin)通过正负离子间的吸附力在云母基片上交替一层一层有序地组装成固体膜 .自组装膜经紫外光幅照反应 ,通过重氮基的分解 ,层间连接的离子键转变成共价键 ,从而增加薄膜的稳定性和堆砌密度 .用原子力显微镜 摩擦力显微镜(AFM FFM)考察了C6 0 在膜中的承载作用及比较不同链结构、不同链长、不同层数自组装膜的表面形貌和微摩擦性能 .初步的研究结果显示了聚合物薄膜的微摩擦性能与聚合物的化学结构、链长和膜的层数有密切关系     

蝎型钒氧配合物的合成、结构及量子化学研究

设计合成了两种新型的以聚类吡唑硼酸盐为配体的钒氧配合物VO(acac)[HB(pz)3](1)和VO(acac)[HB(3,5-Me2pz)3]·CH3CN(2). 运用元素分析、 红外光谱和紫外光谱对所合成的配合物进行了表征, 并用X射线衍射测定了它们的晶体结构. 同时, 采用量子化学的Hartree Fock方法和自然轨道分析方法(NBO), 使用3-21G*(6d, 7f)基组计算得到了两个分子体系的分子轨道、原子电荷以及键级, 并对其结构进行了分析.     

树脂吸附法处理水杨酸甲酯生产废水的研究

采用吸附树脂NDA—99处理水杨酸甲酯生产废水，结果表明该树脂时废水中的5磺基水杨酸及水杨酸均具有良好的吸附—脱附性能．废水经预处理和吸附处理后，CODCr由57000-59000mg／L降至6300mg／L左右，去除率接近89％．用IBV8％NaOH 3BVH2O作脱附剂，在温度为60℃、流量为IBV／h的条件下，脱附率接近100％，树脂可重复使用．高浓度脱附液经酸化、浓缩、冷却结晶，可回收5—磺基水杨酸，回收率为95％左右。纯度为78％。     

纳米稀土谷氨酸咪唑三元配合物的合成、表征及抗菌活性研究

合成了6种新型纳米稀土三元配合物。通过元素分析、摩尔电导、红外光谱、紫外光谱、氢谱、碳谱、热重-差热等表征,确定了该类配合物的化学组成为：RE（Glu）3ImCl3·3H2O（RE=La^3＋,Nd^3＋,Er^3＋,Eu^3＋,Y^3＋,Gd^3＋;Glu=L-谷氨酸;Im=咪唑）,TEM电镜测试表明其有一定规则形貌,粒径在30-60 nm。通过抗菌实验对其抑菌效果进行研究,结果表明：6种纳米稀土三元配合物对大肠杆菌、金黄色葡萄球菌和白色念珠菌均有较强的抑制作用（最小抑菌浓度MIC分别约为140,100,250μg·ml^-1）,属于广谱抗菌剂;抗菌效果明显优于非纳米稀土三元配合物、稀土氯化物、L-谷氨酸或咪唑。     

等离子体辅助合成分子筛膜及其催化性能的研究

首次将等离子体技术应用于分子筛膜的制备，研究了以微波等离子体处理基材表面分子筛膜前驱体辅助水热反应合成支撑β型分子筛膜．利用XRD、SEM、XPS、BET、TPD表征了分子筛膜的物相、形貌、孔结构、表面元素组成和表面酸性，并通过甲醇与异丁烯液相反应体系实验考察了分子筛膜的催化性能．结果表明，等离子体处理能有效改善分子筛膜前驱体在基材表面的分散状况，减小了分子筛膜晶体的尺度，使晶体大小均匀，形成的膜致密、牢固．与采用常规方法合成的分子筛膜相比，等离子体辅助合成的分子筛膜对甲醇与异丁烯的反应有更好的催化活件．     

氟里昂113在多频强红外场离解过程中的V-V能量转移

用TEACO₂激光9P(24),9P(22),9P(20),9P(18)四支线组成的多频强红外场“超激发”氟里昂₁₁₃分子,使其达到很高激发态。由分解曲线可以看出CF₂Cl·CFCl₂与CF₃·CCl₃之间的V-V能量转移有明显的“虹吸”作用。从所得主要产物C₂P₆,C₂Cl₆,C_关键词：     

凝胶渗透色谱和气相色谱-质谱法测定动物食品中27种有机氯和15种拟除虫菊酯类农药残留量

有机氯农药虽已被世界各国禁止使用,但由于其化学性质稳定和难以降解,在环境中仍然存在有机氯农药残留,并通过食物链的富集作用,造成对食物的污染.