正交试验优化纳米氧化锌前驱体乳液合成工艺

以醋酸锌和氨水为原料,结合并流沉淀和超声处理制备纳米氧化锌的前驱体乳液。再利用真空冷冻干燥方法得到前驱体,经过热处理得到纳米氧化锌(约15nm)。用正交试验方法分析了乳液制备工艺对其稳定性的影响,结果表明:分散剂加入量对前驱体乳液稳定性影响最大,合适的分散剂加入量为0.4%(体积分数)。     

纳米氧化锌的杀菌性能

以自制的纳米氧化锌为原料,对其悬浮液和聚氨酯板进行了大肠杆菌和金黄色葡萄球菌的杀菌试验。试验表明,纳米氧化锌具有明显的杀菌效果,随着处理时间的延长,杀菌率逐渐提高;随着氧化锌悬浮液浓度的提高或聚氨酯板中氧化锌添加量的增加,杀菌率也逐渐提高;对金黄色葡萄球菌的杀菌效果好于大肠杆菌。纳米氧化锌悬浮液的杀菌效果好于添加有纳米氧化锌的聚氨酯板,并对其杀菌机理给出了初步解释。     

纳米ZnO的表面改性研究

对比研究了γ-甲基丙烯酰氧基丙基三甲氧基硅烷（MPTMS）与纳米ZnO的不同表面反应方法,制备了表面负载有活性基团-乙烯基的纳米ZnO,初步探讨了表面反应机理。试验表明：以水为分教利的反应方法在环保、节能方面具有不可替代的优越性。     

偶联剂对nano-ZnO/HDPE复合材料性能的影响

通过熔融共混法制备出不同硅烷偶联剂(KH550,KH560)改性的nano-ZnO/HDPE复合材料,并考察了偶联剂及ZnO含量对复合材料性能的影响。结果表明:改性nano-ZnO对HDPE基体起到了明显的增强增韧的效果,当改性nano-ZnO含量为0.2%～0.5%时,复合材料的力学性能最好。此外,nano-ZnO在HDPE中起异相成核剂的作用,从而使体系的熔融温度、结晶温度和结晶度升高。经KH560处理的nano-ZnO/HDPE复合材料的力学性能和结晶性能均优于经KH550处理的nano-ZnO/HDPE复合材料的性能。     

火焰喷涂尼龙1010/纳米ZnO复合涂层力学性能研究

为了探讨纳米ZnO(n-ZnO)对火焰喷涂尼龙1010涂层力学性能的影响，利用电子拉力机对火焰喷涂尼龙1010／n—ZnO复合涂层的力学性能及耐老化性能进行了测试。结果表明，当复合涂层配比为m(PA1010)：m(n-ZnO)=100：1．5时，复合涂层综合性能较佳，涂层自拉伸强度为41．92MPa；涂层与基体结合强度为41．68MPa。提示纳米ZnO能够明显提高涂层与基体的结合强度，对涂层的自拉伸强度也有一定幅度的提高。     

Assessment of UV-permeability in nano-ZnO filled coatings via high throughput experimentation

The degree of UV protection afforded by nano-ZnO in a polyurethane/acrylic clear topcoat was investigated. The influence of nano-ZnO concentration and dry film thickness on the optical properties (e.g., UV permeability and visible transmittance) of the coating was probed using a library of 28 samples that were prepared by high throughput techniques. A model for predicting the UV permeability of nano-ZnO filled coatings was developed and the nano-ZnO loading condition required to block >99% UV radiation was determined to be 2.0 g/m². This model can be used to assist in the development of coatings and other polymeric systems embedded with nano-ZnO to protect the coating and underlying materials (i.e., substrate) from UV degradation.

The Effect of the Nano-ZnO Concentration on the Mechanical,Antibacterial and Melt Rheological Properties of LLDPE/Modified Nano-ZnO Composite Films

LLDPE/modified nano-ZnO composite films were prepared using LLDPE and KH550-modified nano-ZnO by melt blending and blowing. The research results indicated that the introduction of the modified nano-ZnO improved the mechanical properties of the LLDPE films, the maximum tensile strength and elongation at break were obtained at modified nano-ZnO content of 0.3 wt%. The composite films exhibited favorable antibacterial activity against Escherichia coli and Staphylococcus aureus. The low doped content of modified nano-ZnO in LLDPE matrix made the melt viscosity of the composites increase slightly, it was coincident with variation of the balance torque with the nano-ZnO content.     

线型三元纳米复合阻燃材料

采用熔融共混方法制备线型低密度聚乙烯(LL-DPE)/二氧化钛(TiO2)/氧化锌(ZnO)三元纳米复合阻燃材料,通过场发射扫描电镜(FESEM)、红外(FTIR)及扫描电镜(SEM)对复合阻燃材料的微观形态及结构进行表征,证明共混形成的TiO2和ZnO纳米粒子在LLDPE基体复合阻燃材料中呈纳米级分散;对其力学性能的测试表明,三元纳米复合阻燃材料的拉伸断面趋于韧性化,当纳米粒子质量分数为3%时,与纯LLDPE相比,冲击强度提高约49%,拉伸强度提高约18%,断裂伸长率也有所增加。     

硅酮弹性体在真丝织物抗皱整理中的应用

将纳米ZnO作为氨基硅酮弹性体的催化剂,对真丝织物进行抗皱整理,整理后真丝织物的折皱回复角由200.12°提高到255.58°,且不影响织物手感,具有较好的耐洗性能.     

On the zinc sorption by the Serbian natural clinoptilolite and the disinfecting ability and phosphate affinity of the exhausted sorbent

The Serbian natural zeolite is moderately effective in removing the zinc(II) ions from aqueous solutions. At 298 K the sorption capacity varies from 13 to 26% for the initial Zn(II) solution concentration of 100 and 600 mg Zndm(-3), respectively. The sorption isotherm at 298-338 K is best represented by the Langmuir model and the sorption kinetics by the pseudo-second-order model. The sorption involves a combination of film diffusion, intra-particle diffusion, and a chemical cation-exchange between the Na(+) ions of clinoptilolite and Zn(2+) ions. The sorption was found to be endothermic and spontaneous in the 298-338 K range. The exhausted sorbent can remove phosphate ions and it exhibits an excellent antibacterial activity towards Acinetobacter junii. By dehydration at about 500 °C it transforms to a ZnO-containing product featuring nano-sized wurtzite ZnO particles widespread over the clinoptilolite surface.