分别选用十六烷基三甲基溴化铵(CTAB)、十二烷基二甲基苄基溴化铵(DDBAB)、十六烷基溴化吡啶(CPB)和双十二烷基二甲基溴化铵(DDAB)阳离子表面活性剂修饰的凹凸棒土作润滑脂稠化剂,制备凹凸棒土润滑脂,并对其理化性能和摩擦学性能进行测试。结果表明,阳离子表面活性剂修饰的凹凸棒土润滑脂均具有较好的热安定性和胶体安定性,有一定的腐蚀性,其中CTAB脂的综合指标最佳;DDAB含有的双烷基长链有利于凹凸棒土与基础油的亲和,CPB因共轭π键的电荷诱导作用降低了凹凸棒土表面的负电荷,这是凹凸棒土润滑脂具有优异润滑性能的原因。

Attapulgite(ATP)was modified by four cationic surfactants with different structures,which are cetyl trimeth-ylammonium bromide(CTAB),dodecyl dimethyl benzyl ammonium bromide(DDBAB),cetylpyridinium bromide(CPB) and didodecyldimethylammonium bromide(DDAB).The grease was prepared using modified ATP as the thickener,and its physiochemical and tribological properties were tested.The results show that the structures and properties of the cationic surfactants have an important influence on the performance of the grease.From the aspect of physicochemical properties, four kinds of greases have better thermal stability and colloidal stability and have a certain degree of corrosion,in which CTAB grease has the best comprehensive performance.From the perspective of friction and wear behavior,DDAB and CPB greases possess better friction reducing properties,because the former contains a pair of long chain alkyl which helps to combine ATP with base oil,while the latter has conjugated πbond,which can

用电导法测定了不同温度下十六烷基三甲基溴化铵在以氯仿、二氯甲烷为膜相时的一系列迁移动力学曲线,并对实验结果进行了讨论.

The transport kinetic cures of cetyltrimethylammoniumbromide at different temperature cetyl-trimethyl-ammouniumbromide at different temperature have been determined by comductance method using chloroform or dichloromethane as menbrane phase. And the results of the experiments have been discussed.

研究了十六烷基三甲基溴化铵( CTAB)和亮绿SF作用的共振散射光谱特征。结果表明：在pH=4.10缓冲介质中,十六烷基三甲基溴化铵与亮绿SF相互作用形成离子缔合物,产生以505 nm为特征峰的共振光散射( RLS)增强信号,其RLS增强程度与亮绿SF浓度成线性关系,检出限和线性范围分别为97.6 nmol/L和0.98~75υmol/L,据此建立了痕量亮绿SF的共振光散射分析方法。将方法用于水样中亮绿SF含量的快速检测,结果令人满意。

Cetrimonium Bromide ( CTAB ) and light green SF union resonance scattering spectrum characteristic were studied. The experimental result indicated that in pH=4. 10 buffer solution, CTAB and light green SF interacted to form ion-association complex, which resulted in greatly enhanced resonance light scattering ( RLS) signals at 505 nm. It was found that the enhanced RLS intensities (△IRLS) at 505 nm were proportional to the concentration of light green SF. The determination limit and the linear range of light green SF were 97. 6 nmoL/L and 0. 98 ~75 υmol/L. Thus a new method for trace light green SF could be established accordingly. The method was applied to determine light green SF in actual water samples with satisfactory results.

该文研究了表面活性剂十六烷基三甲基溴化铵（CTAB）对二甲酚橙（XO）光度法测定锌的增敏作用.结果：锌-二甲酚橙（XO）络合物呈紫红色,其最大吸收波长为572 nm,摩尔吸收系数K=1.16×104 L·mol-1·cm-1.在六次甲基四胺缓冲体系中,加入十六烷基三甲基溴化铵（CTAB）后,锌-二甲酚橙（XO）-CTAB络合物的最大吸收波长为583 nm,摩尔吸收系数K=1.76×104L·mol-1·cm-1,锌含量在0--2.0μg·mL-1范围内遵守朗伯比尔定律,线性回归方程为：A=0.2715 C＋0.1447,检出限达到0.0053 g·L-1.该方法具有较高灵敏度,操作简便,可用此方法可有效地测定奶粉中的锌含量.

Zinc content in milk powder was determined by xylenol orange( XO)sensitized by cetyl trimethyl ammonium bromide( CTAB). The system formed by zinc and XO in the solution of methenamine is purple and presents the maximum wavelength 572 nm with its apparent molar absorption factor 1. 16 × 104 L·mol-1 ·cm-1 , while the improved system added by CTAB exhibits the maximum absorption wavelength 583 nm with the factor 1 . 76 × 104 L·mol-1 ·cm-1 . The absorption intensity follows with the Lambert-Beer′s law better in the range 0~2. 0 μg·mL-1 of zinc content and their correction equation is A =0. 2715C+0. 1447 with the detection limition 0. 0053 g · L-1 in the improved system. The work provides an accuracy,high sensitive and good operational method,which can be used to determine the zinc content in milk power effectively.

以硅酸钠为硅源，十六烷基三甲基溴化铵（CTAB）为模板剂，合成介孔材料MCM-41．采用两步嫁接法，分别用三甲基氯化硅（TMSCL）和3-氨基三乙氧基硅烷（APTS）对合成的介孔分子筛进行化学修饰，首次将甲基和氨基同时嫁接到介孔材料MCM-41上，得到新型的介孔材料CH3-MCM-41-NH2．利用XRD和FT—IR对合成的新型功能化介孔材料进行表征．

Mesoporous material MCM -41 was prepared with sodium silicate as silicon source and hexadecyl trimethyl ammonium bromide (CTAB) as template.New functional mesoporous CH 3 -MCM-41-NH2 was suc-cessfully synthesized when the groups of methyl -and amino-were first introduced into the mesoporous MCM -41 by modifying with trimethyl chlorosilane ( TMCS) and 3-Aminotriethoxysilane ( ATS) .The prepared materials were characterized by X-ray diffraction ( XRD) and Fourier Transform Infrared Spectrometer ( FT-TR) .