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51.
Assessment of UV-permeability in nano-ZnO filled coatings via high throughput experimentation 总被引:1,自引:0,他引:1
Michael S. Lowry David R. Hubble Amy L. Wressell Menas S. Vratsanos Frank R. Pepe Charles R. Hegedus 《Journal of Coatings Technology and Research》2008,5(2):233-239
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.
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Charles R. HegedusEmail: |
52.
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。 相似文献
53.
On the zinc sorption by the Serbian natural clinoptilolite and the disinfecting ability and phosphate affinity of the exhausted sorbent 总被引:1,自引:0,他引:1
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. 相似文献