纳米ZnO薄膜掺磷、硼的电学性能研究

用扫描俄歇探针研究了掺杂磷、硼对纳米ZnO薄膜电学性能的影响。结果表明，ZnO薄膜掺入磷或硼后，可以显著降低薄膜电阻；改变扩散温度可以改变磷、硼浓度，从而改变Zn/O化学计量比，Zn/O化学计量比越大，薄膜电阻越小；掺磷或硼的ZnO薄层电阻最低值得的扩散温度分别为850℃和800℃。     

纳米ZnO对聚乙烯抗紫外光老化的影响

聚乙烯是电气绝缘领域应用最广泛的聚合物材料之一,在紫外光照射下易发生光降解反应。为防止其光降解,提高聚合物的使用寿命,有必要在聚乙烯基体中添加某种抗紫外光老化的添加剂。纳米ZnO是新兴的无机纳米光稳定剂,能有效地反射或吸收紫外光而达到保护聚合物的作用。本文将少量纳米ZnO与低密度聚乙烯熔融共混,研究了光老化不同时间后介电性能及红外光谱的变化。结果表明添加纳米ZnO的聚乙烯复合材料有较好的光稳定性。     

经纳米氧化锌处理后真丝织物风格分析

利用KES—FB风格仪测试了经纳米ZnO处理后的真丝织物的风格,通过低应力下的拉伸试验、剪切试验、纯弯曲试验、压缩试验分析了真丝织物风格变化,结果表明,经纳米ZnO分散液整理的桑蚕丝织物柔软性、回复性提高。     

乙二胺对溶胶-凝胶法制纳米ZnO形貌的影响研究

本文采用溶胶-凝胶法,以醋酸锌、草酸为主要原料制备了纳米ZnO。通过在反应体系中加入有机物乙二胺制得棒状的纳米ZnO,并且通过XRD和TEM对产物的形貌进行了表征。结果表明所得产物属于纤锌矿结构的六方相ZnO,乙二胺对棒状纳米ZnO的形成起关键作用,乙二胺的加入量对棒状纳米ZnO的形貌也有一定的影响。并且简单讨论了棒状纳米ZnO的生长机理。     

主链含亲水基团的聚氨酯/改性纳米ZnO复合膜的制备与性能

以异佛尔酮二异氰酸酯(IPDI)、聚酯二元醇、二羟甲基丙酸(DMPA)、硅烷偶联剂改性纳米ZnO等为原料,通过阴离子自乳化法制备了一系列聚氨酯/改性纳米ZnO复合膜。主要研究了纳米ZnO含量对复合膜的力学性能、耐摩擦性能和耐水性能的影响。结果表明:当偶联剂用量为5%、反应温度为70℃、搅拌时间为2h时,纳米ZnO改性效果最好;当改性纳米ZnO含量为0.5%时,复合膜具有良好的综合性能。     

水溶液中直接形成纳米氧化锌的热力学分析

从ZnO(s)和Zn(OH) 2 (s)在水溶液中的溶解平衡入手 ,从理论上探讨了水溶液中直接形成纳米氧化锌的合成条件 ,理论分析与试验结果相吻合。研究表明 ,只要满足一定条件 ,在强碱水溶液中纳米氧化锌可以一步合成 ;一步直接合成纳米氧化锌必须控制溶液的 pH >9,温度对一步直接合成纳米氧化锌的影响较大 ;溶液的过饱和度对一步合成过程会产生影响 ,增加反应体系中氧化锌的过饱和度 ,将会促进氧化锌晶体的形成与生长     

纳米ZnO在水体系中的分散研究

运用正交设计法研究了以PEG为分散剂制备高分散、高稳定性的纳米ZnO水悬浮液的各项影响因素.通过紫外线分析法检测证实,用PEG为分散剂能够制备高分散、高稳定的纳米ZnO水悬浮液,且保持良好的纳米效应.     

Effect of nano-ZnO with different particle size on the performance of PVDF composite membrane

To evaluate the effect of nanoparticle size on the structure and performance of the membranes, polyvinylidene fluoride composite membranes modified by nano-ZnO with different particle size were successfully fabricated by the non-solvent induced phase inversion method. A series of tests, including contact angle measurement, porosity and pore size measurement, scanning electron microscope, atomic force microscopy, differential scanning calorimeter and filtration experiments were performed to characterise the composite membranes. The results showed that the size of nano-ZnO particle has an influence on the structure and performance of the composite membranes. The membrane with 90?nm nano-ZnO particle has abundant porosity, high hydrophilicity and low surface roughness. These features are responsible for its excellent permeability and antifouling property.     

MC尼龙6／纳米ZnO复合材料等温结晶动力学的研究

采用原位聚合反应制备了MC尼龙6／纳米ZnO复合材料,并用差示扫描量热法（DSC）研究了MC尼龙6／纳米ZnO复合材料的等温结晶动力学。结果表明,在188～196℃时MC尼龙6及MC尼龙6／纳米ZnO复合材料结晶速率主要由成核过程控制。MC尼龙6／纳米ZnO复合材料的结晶速率G比MC尼龙6提高了0．1～0．3min^-1.研究发现,纳米ZnO的加入起到了异相成核的作用,提高了MC尼龙6的结晶速率。MC尼龙6和MC尼龙6／纳米ZnO复合材料的结晶速率G和结晶速率常数k均随结晶温度的升高而降低,半结晶时间t1/2和达到最大结晶速率的时间tmax随结晶温度的升高而缩短。但是MC尼龙6／纳米ZnO复合材料比MC尼龙6降低的幅度更大。     

Effect of nano-ZnO addition on the silicone-modified alkyd-based waterborne coatings on its mechanical and heat-resistance properties

A silicone-modified alkyd-based waterborne coating was developed using hexamethylmethoxymelamine (HMMM) as crosslinking agent and para-toluene sulphonic acid (p-TSA) as catalyst. The crosslinking ratio for resin and HMMM was fixed to 70:30, based on FTIR and DSC studies. Nano-ZnO particles were added to this system in different concentrations. The coatings with nano-ZnO particles were characterized using FTIR and DSC. The nano-composite coatings were applied on mild steel panels and were cured at 130 °C for 30 min. The coatings were evaluated for their mechanical and heat-resistance properties. They were exposed to 350 °C for 10 min followed by water quenching. The process was repeated for 10 cycles. Heat-resistance property of the coatings was examined by TGA. Also, surface morphological changes were assessed using SEM and optical microscopy. It was found that the heat-resistance and mechanical properties of the coatings improved significantly as a function of nano-ZnO addition.