富铁硅钛铈矿的晶体化学

通过电子探针分析和晶体结构测定, 证明四川冕宁碱性花岗岩中的天然非变生铁硅钛铈矿, 以富含铁、稀土和铌为特征, FeO(全铁)质量分数为10.97%～11.59%, Ce2O3 变化范围为23%～25%, Nb2O5为1.53%～2.10%;化学式中存在A型和(B C)型阳离子缺失; 具有C2/m空间群(R=2.41%); 晶胞参数为: a=1.3456(3) nm, b=0.57280(10) nm, c=1.1083(2) nm, β=100.60(3)°, V=0.8397(3) nm3, Z=2. 富铁硅钛铈矿的晶体结构由2种层组成, 一是由Si2O7 基团和B-八面体构成的层, 一是由C-八面体层构成的层; 2种层均平行ab平面, 沿c轴交替排列构成三维格架. 稀土离子位于双硅酸根和八面体层之间, 形成(8 3)配位的A(1)多面体和10配位的A(2)多面体. Fe和Ti呈部分有序分布于B, C(1), C(2A) 和C(2B)位置中.     

季铵型阳离子纤维素对水中腐殖酸的吸附

以异丙醇为分散剂,碱纤维与3-氯-2-羟丙基三甲基氯化铵反应,醚化接枝制得一种环境功能材料-季铵型阳离子纤维素(QACC)。用红外光谱、X-射线衍射和电镜扫描对材料的结构进行了表征:红外光谱中1 644 cm-1处存在明显的季铵基的弯曲振动。经过改性的QACC结晶度下降,比表面积增加。研究了QACC对腐殖酸的吸附性能:pH=8、318 K时,QACC对腐殖酸的饱和吸附容量为622 mg·g-1;其表观活化能为6.45 kJ·mol-1;吸附符合Lagergren二级动力学方程,吸附速率随温度升高而加快;吸附等温模型符合Langmuir等温式,为单分子层吸附;吸附腐殖酸的ΔH、ΔS、ΔG分别为:31.7 kJ·mol-1、119 J·mol-1·K-1、-5.34 kJ·mol-1,吸附主要为化学吸附。     

可聚合表活性单体的研究进展

可聚合表活性单体(英文简称,Surfmer)是一种功能性表面活性剂,其特点为分子结构中同时具有亲水和疏水的基团,且含有可聚合的双键。这一结构特点赋予它们独特的物理化学性质———两亲性和可聚合特性。可聚合表活性单体作为新型的聚合单体在工业生产、科学研究等领域有着广泛的应用价值。本文根据可聚合表活性单体离子电荷的不同,综述了六种可聚合表活性单体的合成、性质及应用研究情况,并对可聚合表活性单体的研究趋势和未来前景进行了展望。     

离子色谱法分析油气田地层取样样品中的阴、阳离子

探讨使用离子色谱仪分析油气田地层取样样品的可行性。该方法使用ICS900型离子色谱仪(配阴离子色谱柱AS19和阳离子色谱柱CS12A),同时由自动淋洗液发生器RFC30产生20 mmol/L氢氧化钾溶液和20mmol/L甲烷磺酸溶液,流量为1 m L/min。7种离子测定结果的相对标准偏差为0.87%~3.40%,样品加标回收率为98.00%~104.0%。该方法精密度和准确度满足油气田地层取样样品中阴阳离子的分析要求。     

Synthesis,UV-curing behavior and surface properties of fluorine-containing vinyl ether polymers

Five fluorine-containing vinyl ether monomers were prepared by the reaction between 2-vinyloxy ethanol, a fluorinated alcohol and hexafluorobenzene in the presence of sodium hydride in dimethylformamide. Two representative properties of these monomers, UV-curing behavior initiated by a cationic photo-initiator PAG 201 and surface free energy of coating films, were investigated. Photo-polymerization proceeded both rapidly and completely with a high double-bond conversion （〉 90%） and a fast curing rate （maximum curing time 〈 21 s） for three monomers. The surface energies of the monomers and the resulting polymer films were then investigated. The minimum surface free energy of the UV-cured homopolymer films reaches 7.1 mJ/m2. X-ray photoelectron spectroscopy data show that the low surthce tension is influenced by fluorine content in the soft segments and fluorinated chains＇ migration to the surface. The five monomers exhibit low viscosity, low surface energy, good thermal stability and good photo-polymerization properties, which make them great candidates for UV coating and photoresist applications.     

Photo-induced Living Cationic Copolymerization of Isobutyl Vinyl Ether and Vinyl Ether with Carbazolyl Groups

In this work, a fluorescent monomer 2-（9-carbazolyl） ethyl vinyl ether（CEVE） was synthesized in our lab, and its photo-induced living cationic copolymerization behavior with isobutyl vinyl ether（IBVE） was investigated in detail using diphenyliodonium chloride（DPICl）/2,2-dimethoxy-2-phenylacetophenone（DMPA） and zinc bromide（Zn Br2） initiating system in dichloromethane solution at 5 °C, -5 °C, and -15 °C, respectively. The living nature of this copolymerization system was confirmed by adding fresh comonomer method after the copolymerization almost finished. In addition, the obtained fluorescent copolymer poly（IBVE-co-CEVE） has a low glass transition temperature（Tg）, below -10 °C.     

The preparation of cationic folic acid and its application in drug delivery system

The cationic folic acid（CFA） was prepared by introducing triethylenetetramine into folic acid with EDCI/NHS and characterized by IR, NMR and mass spectra. It was found that approximately one of two carboxyls in the folic acid molecule was substituted to form CFA. The conversion of γ-carboxyl is found to be 59% higher than 30% of γ-carboxyl. The CFA and doxorubicin hydrochloride can be loaded on the ionic shell of PTX-encapsulated micelle to form CFA loaded binary drug carrier via static interaction in aqueous solutions. The successful loading was demonstrated by zeta potential measurement and the drug load amount（DLA） of CFA was measured by HPLC. In vitro cytotoxicity results revealed the CFA drug carrier showed higher cytotoxicity to cancer cell MDA-MB-321 than the binary drug carrier without CFA and the positive control, while it showed lower cytotoxicity to normal cell HUVEC than the positive control, and similar cytotoxicity with the binary drug carrier without CFA. These results as well as confocal laser scanning microscopy observation indicate the synthesized CFA drug carrier possesses active tumor-targeting property.     

Synthesis and Theoretical Investigation of a New Hybrid Polymeric Iodoplumbate Based on Co-template： [（ipq）2（pea）（Pb3I9）·DMF]n

A new iodiplumbate polymer [（ipq）2（pea）（Pb3I9）-DMF]n 1 （ipq = N-（isopentyl）- quinolinium, pea = protonated ethylamine） was synthesized by self-assembly reaction of ipq·I, PbI2 with ethylamine and structurally characterized. 1 crystallizes in the triclinic system, space group P1 with α= 1.0731（4）, b = 1.2560（4）, c = 2.0785（7） nm, α = 96.378（5）, β= 91.132（2）, γ= 100.303（5）°, V= 2.7369（16） nm^3, Z= 2, Dc = 2.770 g/cm^3,μ = 14.307 mm^-1, F（000） = 2014, R = 0.0588 and wR = 0.1345. 1 features its hybrid structure concertedly templated by two kinds of organic cations, which exhibits interesting semiconductor property. In 1, the [Pb2I6]^2 n infinite chains shape the sketch of the title compound constructed from face-sharing of ideal and distorted PbI6 octahedra. Based on the crystal structure data, quantum chemistry calculation with DFT was used to reveal the electronic structure of 1.     

溴化十六烷基三甲铵与邻{2-[α- (2-羟基-磺酸苯偶氮)-亚苄基]肼基}苯甲酸的显色反应及其应用

1 引言 表面活性剂在工农业生产及人类日常生活中的应用越来越广泛,研究表明活性剂在环境中的转化、迁移及对生理过程的影响以及对它的测定是十分有意义的课题,常规测定阳离子表面活性剂的方法有称重、萃取、滴定、电张力、交流示波极谱法、气相色谱法、光化学等,但这些方法大多操作繁琐、复杂,并且灵敏度不高.实验发现邻{2-[α-(2-羟基- 磺酸苯偶氮)-亚苄基]肼基}苯甲酸(ZCN)与溴化十六烷基三甲铵(CTMAB)在pH 5.0的缓冲溶液中相互作用,致使UV光谱发生变化,最大吸收峰红移80～110 nm,具有较好的对比性.同时发现此法具有较高的灵敏度和较宽的线性范围.     

季铵阳离子对萘系高效减水剂性能影响研究

以 β -萘磺酸甲醛缩合物钠盐为原料 ,通过离子交换树脂法制备了六种不同结构的季铵阳离子所对应的萘磺酸甲醛缩合物盐 ,并研究了它们对水泥混凝土各项性能的影响