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东方蝼蛄体表形态与润湿性 总被引:4,自引:3,他引:1
利用扫描电镜分析了东方蝼蛄(Cryllotalpa orientalis Burmeister)前胸背板、腹部、翅膀和足部的体表形态,测定了东方蝼蛄体表刚毛的覆盖密度和尺寸.在OCA20型接触角测量仪上测量了水与东方蝼蛄体表各部位的接触角,分析了东方蝼蛄体表几何微结构与润湿性的关系.研究表明,东方蝼蛄前胸背板、覆翅、腹部、足、膜翅的刚毛覆盖密度分别为40.32%、31.82%、23.89%、19.11%、14.17%,水与东方蝼蛄体表各部位的接触角平均值为110.8°~141.5°,表现出很高的疏水性能.东方蝼蛄体表刚毛形成的几何结构表面与刚毛的高疏水性能的综合作用是其体表不沾土壤和水的重要机理. 相似文献
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The main objective of this research is to evaluate the wettability of the processed bamboo surfaces. The important surface energy and acid-base properties for processed bamboo have been estimated by using contact angle techniques. According to the results, the change of ages has a positive relation with the contact angles of water on processed bamboo. The contact angles were increased after the bamboo surface treated in high temperature condition and preservation. The different treat methods have a strong influence on acid-base energy component insurface of bamboo. Compared with pinewood, the surface of bamboo seems to be stronger in the acid-base energycontribution. 相似文献
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The aim of this study was to investigate the effect of the thermal modification process by hot-press on the wettability and surface roughness characteristics of the eucalyptus wood boards. The roughness measurements, average roughness (Ra), and maximum roughness (Rmax) were taken both parallel and perpendicular to the grain using a fine stylus tracing technique. Contact angle measurements were obtained using a goniometer system connected to a digital camera and computer system. The results showed that surface roughness values of the modified wood boards using a hot-press significantly decreased with increasing press pressure and with decreasing temperature. The contact angle measurements indicated that the thermal modification had a significant influence on the surface wettability of the wood boards. Statistical analyses showed significant differences in the surface roughness and contact angle values of the wood boards following thermal modification. The results acquired in this work provide important information for future research and utilization of the thermally modified wood boards. 相似文献
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Young Ah Kwon 《Fibers and Polymers》2002,3(4):174-178
A plasma treatment using saturated CF4 gas was employed to improve the resistance of polypropylene fabrics to water wetting. The fabrics were significantly fluorinated
even within a short treatment time of 30 seconds. The result of contact angle measurement indicated that such highly hydrophobic
surface was considerably durable even after 150 days of aging. 相似文献
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微波等离子体处理对杉木表面性能的影响 总被引:18,自引:1,他引:18
为了解微波等离子体处理对杉木表面性能的影响,使用接触角测定评估表面润湿性,使用扫描电子显微镜观测表面处理前后的差异。结果表明,杉木表面轻微波等离子体处理后,接触角下降为零,即使处理条件十分微弱、处理效果仍然十分明显,这表明微波等离子体处理可显著提高木材表面的润湿性,微波等离子体处理使杉木表面形成粗化面,即表面明显有等离子体蚀刻过的痕迹并留下凹凸不平的坑洼,粗化面的形成可能是导致杉木表面接触角下降, 相似文献
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Yanni Sudiyani Sakae Horisawa Keli Chen Shuichi Doi Yuji Imamura 《Journal of Wood Science》2002,48(6):542-547
Changes in mold populations and genera on the exposed surfaces of tropical hardwoods — albizia (Paraserianthes falcata), kapur (Dryobalanop lanceolata), mahoni (Switenia macrophylla), nangka (Artocarpus heterophyllus), puspa (Schima wallchii) — were investigated. The wood specimens were exposed to the Indonesian climate for 32 weeks. Properties including mass loss, wettability, mold growth (colony-forming units), and mold genera were evaluated. The change in properties after exposure was significantly affected by the wood species, but there was no clear relation between mass loss and the initial chemical components or between wettability and wood density. The number of mold populations was different by exposure period and wood species, but there was no significant effect of climate conditions, such as rainfall and ultraviolet radiation. Of the genera identified,Aureobasidium, Cladosporium, andPenicillium were dominant molds on the exposed wood surfaces. 相似文献