湿法处理—火焰原子吸收光谱法测定吸附树脂中的金

试样采用在加入的硫酸冒烟过程中缓慢滴加硝酸消解,再以王水溶解金的湿法处理方式,采用火焰原子吸收光谱法测定吸附树脂中的金。实验结果表明:在硫酸冒烟过程中,硝酸可以消解试样中的有机物,使试样中的金能完全溶出;其测试结果与火试金法及灼烧灰化—火焰原子吸收光谱法一致,相对标准偏差小于0.5%,加入标准物质回收率大于99%。     

载银二氧化钛在防晒霜中的应用研究

采用溶胶凝胶法将银掺人二氧化钛中,以载银二氧化钛为原料制备抗菌防晒护肤膏,研究载银二氧化钛对护肤膏的防晒性能、色泽稳定性以及抗菌性的影响,结果表明,w（银）为1%的二氧化钛应用于防晒护肤膏中具有较好的防晒性能、抗菌性和色泽稳定性。     

Effect of surfactants on preparation of nanometer TiO2 by pyrohydrolysis

The nanometer TiO2 was prepared by pyrohydrolysis with titanic solution.The effects of species and content of the surfactants on the particle size,morphology and phase of TiO2 were studied by using LPA,XRD and TEM respectively.The results show that it is beneficial to reducing the aggregation of TiO2 particles with adding surfactants to the solution.Nanometer TiO2 powders with the size of 40-55 nm are obtained by adding the anion surfactants in the optimal content of 1.5%(mass fraction).The effect of cationic surfactant for reducing particle aggregation is not as good as that of anion.The crystal phase constitutent of TiO2 is dependent on the temperature of thermal treatment and complete anatase can be achieved after calcining in the temperature range of 350-750℃.     

掺杂改性LiFePO_4正极材料制备及表征

采用微波热合法制备了掺杂LiFePO4锂电池用正极材料。通过XRD、SEM表征了材料的晶体结构和形貌,采用恒电流充放电法研究了材料的电化学性能。XRD结果表明,掺杂后的材料晶相为橄榄石型磷酸铁锂;SEM测试结果表明,加热时间延长促使材料颗粒团聚长大,且结晶完整,颗粒分布均匀。对电池的电化学测试表明,制备的掺杂LiFePO4材料表现出优良倍率性能和循环稳定性,充放电比容量分别为131.7 mAh/g和123.8 mAh/g,10次循环后比容量没有明显衰减。     

纳米ZnO的制备

本文研究了以Zn (No3 ) 2 、尿素为原料 ,加入表面活性剂改性制备纳米氧化锌粉体的方法。实验讨论了Zn (NO3 ) 2 浓度、尿素浓度、pH值、焙烧温度对纳米氧化锌粒径的影响。用扫瞄电镜和粒度分析仪确定纳米氧化锌的形貌和粒径     

凹槽中化学镀铜

通过平面镀铜和凹槽镀铜试验，讨论了不同工艺条件下镀铜沉积速度和副反应对镀层性质的影响；并对化学镀铜液中各种络合剂和添加剂进行电化学测试分析，选择合适的络合剂和添加剂以及相应的条件，避免凹槽镀铜中空洞可缝隙产生。     

纺织品中易挥发土腥霉味组分分析

采用直接顶空进样气相色谱-质谱法测定纺织品中二甲萘烷醇(GSM)、2-异丁基-3-甲氧基吡嗪(IBMP)和2-甲基异茨醇(M IB)异味物质,考察了顶空加热时间、温度等因素对异味化合物回收率的影响,结果表明:2-异丁基-3-甲氧基吡嗪、2-甲基异茨醇和二甲萘烷醇检出限分别为0.01 mg/kg、0.005 mg/kg、0.003 mg/kg。加标回收率依次为在81%、95%、84%,相对标准偏差均小于7%,该测试方法简单、快捷、可靠,结果令人满意。     

浅谈塑料复合食品包装材料中的溶剂残留

文中探讨了欧盟、美国和我国关于塑料复合食品包装材料中溶剂残留的卫生标准和检测方法,分析了溶剂残留的影响因素,最后提出了降低溶剂残留的对策。     

Effect of thermal treating temperature on characteristics of silver-doped titania

The silver-doped titania antibacterial agent was synthesized by mixing silver nitrate and the precursor of titania. Effects of thermal treatment on the properties of the silver-doped titania powders were investigated by thermal gravimeter/differential thermal analyzer（TG/DTA）, scanning electron microscope（SEM）, and X-ray diffractometer（XRD）, respectively. The results show that the anatase phase forms in titania when the powder is calcined at 400℃. With the increase of the calcination temperature from 400 to 700℃ , the grains of titania agglomerate and the particle size increases from 14 to 23 nm, and the specific surface area decreases from 63 to 38m^2g. As the powder is calcined at 700℃, titania starts to transform from anatase to futile phase. The release rate of silver ion of powder treated at the relatively low temperature is larger than that of powder treated at the relatively high temperature. The antibacterial tests show that the antibacterial activity of silver-doped titania powders is excellent against E.coli and S. aureus, and the antibacterial activity of powders weakens with the increase of the calcination temperature.     

Preparation of titanium dioxide/silver sulfate powder and its antibacterial activity

Antibacterial powders of titanium dioxide/silver sulfate were produced by heat-treatment of the metatitanic acid, as precursor, into which the silver nitrate was added. The influences of heating temperature on the structure and composition of the product were investigated through XRD and SEM. The results show that the powder is spherical in the phase of TiO2-Ag2 SO4. The granularity of the particles increases from 10.7 nm to 28.7 nm with the temperature of heat-treatment increasing from 300 ℃ to 800 ℃. The antibacterial activity of the powder was judged in the way of the minimum inhibitory contents (MiCs). When the content of silver sulfate is less than 2%, the photocatalysis of titanium dioxide and silver ions cooperate to kill bacteria. And the MiCs decrease and keep around 1.0× 10-4- 1.5 × 10-4 constantly with the increase of silver content. Furthermore, the MiCs decrease with the increase of temperature of heat-treatment when the temperature is lower than 500 ℃. But when the temperature is beyond 600 ℃ the MiCs increase quickly, which shows the inferior antibacterial performance.