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表面憎水处理改善陶粒吸水性能的研究 被引量:13
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作者 钱觉时 卢浩 张智强 《建筑材料学报》 EI CAS CSCD 2002年第2期181-185,共5页
对陶粒表面进行憎水处理可以降低陶粒的吸水率 ,从而有利于改善轻集料混凝土的性能 .试验结果表明 ,ZH溶液相比于常用的憎水溶液和防水涂料 ,能非常明显地降低页岩陶粒的吸水率 ,并且使用简单、成本低廉 .进一步的试验结果显示 ,以ZH溶... 对陶粒表面进行憎水处理可以降低陶粒的吸水率 ,从而有利于改善轻集料混凝土的性能 .试验结果表明 ,ZH溶液相比于常用的憎水溶液和防水涂料 ,能非常明显地降低页岩陶粒的吸水率 ,并且使用简单、成本低廉 .进一步的试验结果显示 ,以ZH溶液和G溶液复合的方式 ,还能有效降低页岩陶粒 6h以上的吸水率 . 展开更多
关键词 表面憎水 陶粒 吸水率 混凝土
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憎水涂层对铝单丝表面覆冰性能的影响 被引量:10
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作者 汪佛池 李成榕 吕玉珍 《中国电机工程学报》 EI CSCD 北大核心 2011年第10期123-128,共6页
为研究憎水性涂层对铝单丝表面覆冰性能的影响,在低温过冷水条件下,利用实验室导线覆冰模拟系统试验研究了不同憎水性铝单丝表面覆冰的形成过程。研究发现:用普通憎水涂层涂覆铝单丝虽不能抑制表面覆冰的形成和增长,但可以延缓表面覆冰... 为研究憎水性涂层对铝单丝表面覆冰性能的影响,在低温过冷水条件下,利用实验室导线覆冰模拟系统试验研究了不同憎水性铝单丝表面覆冰的形成过程。研究发现:用普通憎水涂层涂覆铝单丝虽不能抑制表面覆冰的形成和增长,但可以延缓表面覆冰层的形成时间;硬脂酸涂覆制备的超憎水铝单丝表面可以有效抑制表面覆冰的形成和增长。分析表明:普通憎水性表面可以抑制表面附着水滴的湿润和扩散,但表面附着水滴与涂层间的作用力较大,水滴滑行角较大,水滴不易滑落表面;硬脂酸涂覆制备的超憎水铝单丝表面具有特殊的微纳米结构和较小的水滴滑行角,不利于水滴的粘附和冻结。 展开更多
关键词 电力系统 憎水涂层 铝单丝 覆冰 憎水表面
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通过憎水振动表面常压连续制备二氧化硅气凝胶球填料 被引量:2
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作者 黄健 张爱满 +4 位作者 房猛 江奇 王新 吕正航 马保国 《硅酸盐学报》 EI CAS CSCD 北大核心 2019年第8期1151-1159,共9页
以硅溶胶为低成本前驱体,采用滴落法,通过憎水振动表面常压干燥连续制备了SiO2气凝胶球填料,分析了溶胶液滴受力。结果表明:所制备的气凝胶球圆度值更接近1,气凝胶球更接近球形。体系凝胶时间可控制在30 min以内,气凝胶球粒径为1~6 mm,... 以硅溶胶为低成本前驱体,采用滴落法,通过憎水振动表面常压干燥连续制备了SiO2气凝胶球填料,分析了溶胶液滴受力。结果表明:所制备的气凝胶球圆度值更接近1,气凝胶球更接近球形。体系凝胶时间可控制在30 min以内,气凝胶球粒径为1~6 mm,圆度值≤1.3,样品的表观密度为0.152~0.186 g/cm^3,比表面积为387~481 m^2/g。随着硅水比的增大,气凝胶球密度总体增大。样品具有连续多孔网络结构和优异的疏水性。当硅水比(质量比)为0.03时,气凝胶骨架上可接枝最多的三甲基硅氧烷,疏水角达155°,并连续稳定成球。 展开更多
关键词 憎水振动表面 滴落法 常压 二氧化硅 气凝胶 球状填料
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Research on asphalt concrete pavement deicing technology 被引量:2
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作者 马辉 杨若冲 钱吮智 《Journal of Southeast University(English Edition)》 EI CAS 2014年第3期336-342,共7页
In order to reduce the cohesive force between pavement and ice, the approach of pavement surface coating with hydrophobic admixtures is investigated. The deicing effect of this approach is examined by the contact angl... In order to reduce the cohesive force between pavement and ice, the approach of pavement surface coating with hydrophobic admixtures is investigated. The deicing effect of this approach is examined by the contact angle test and the shear test. The durability of the approach is examined by the accelerated abrasion test, and the skid resistance of the pavement with surface coating is examined by the British pendulum test and the surface texture depth test. In the contact angle test, the contact angle between hydrophobic admixture and water is 100.2°. In the shear test, the maximum shear stress is 0.06 MPa for the specimen coated with hydrophobic admixture, which is much lower than that of the specimen without hydrophobic admixture coating, 3.5 MPa. Furth- ermore, the ice and asphalt surface are completely separated for the coated specimen while not for the uncoated specimen. Based on the accelerated abrasion test, the residual hydro- phobic admixture in the veins of the pavement after abrasion still has a deicing effect. From the skid resistance tests, the British pendulum number (BPN) and the texture depth (TD) of the specimen coated with hydrophobic admixtures are larger than those of the standard requirements. The overall experi-mental observation indicates that the approach can effectively reduce close contact between asphalt pavement and ice; therefore, it can be a promising solution to road icing problems in winter. 展开更多
关键词 DEICING hydrophobic admixture surfacecoating cohesive force DURABILITY
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复合绝缘子外绝缘特性 被引量:1
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作者 莱芜 周志敏 《广东输电与变电技术》 2003年第1期12-16,共5页
本文从理论与实践上分析了复合绝缘子的结构、特性,论述了复合绝缘了外绝缘中硅橡胶本身特有几种憎水迁移性能。
关键词 复合绝缘了硅橡胶表面外绝缘憎水迁移性
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Hydrophobic aggregation of ultrafine kaolinite
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作者 张晓萍 胡岳华 刘润清 《Journal of Central South University of Technology》 EI 2008年第3期368-372,共5页
The hydrophobic aggregation of ultrafine kaolinite in cationic surfactant suspension was investigated by sedimentation test,zeta potential measurement and SEM observation. SEM images reveal that kaolinite particles sh... The hydrophobic aggregation of ultrafine kaolinite in cationic surfactant suspension was investigated by sedimentation test,zeta potential measurement and SEM observation. SEM images reveal that kaolinite particles show the self-aggregation of edge-face in acidic media,the aggregation of edge-face and edge-edge in neutral media,and the dispersion in alkaline media due to electrostatic repulsion. In the presence of the dodecylammonium acetate cationic surfactant and in neutral and alkaline suspension,the hydrophobic aggregation of face-face is demonstrated. The zeta potential of kaolinite increases with increasing the concentration of cationic surfactant. The small and loose aggregation at a low concentration but big and tight aggregation at a high concentration is presented. At pH=7 alkyl quarterly amine salt CTAB has the best hydrophobic aggregation among three cationic surfactants,namely,dodecylammonium acetate,alkyl quarterly amine salts 1227 and CTAB. 展开更多
关键词 ultrafine kaolinite cationic surfactant SEM observation hydrophobic aggregation
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n-Octadecanethiol Self-Assembled Monolayer Coating with Microscopic Roughness for Dropwise Condensation of Steam 被引量:2
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作者 Liang CHEN Shiqiang LIANG +3 位作者 Runsheng YAN Yanjun CHENG Xiulan HUA Shuling CHEN 《Journal of Thermal Science》 SCIE EI CAS CSCD 2009年第2期160-165,共6页
Here we presented a novel technology to achieve a Super-hydrophobic coating with microscopic roughness on copper surface. First, make a layer of verdigris grow on the fresh pure copper surface. Gain it by exposing the... Here we presented a novel technology to achieve a Super-hydrophobic coating with microscopic roughness on copper surface. First, make a layer of verdigris grow on the fresh pure copper surface. Gain it by exposing the copper to air and the mist of acetic acid solution. The green coating is a mixture of basic copper(II) carbonate and copper(II) acetate. Second heat the coating and make it decompose to CuO. Lastly, form an n-octadecanethiol self-assembled monolayers coating on the outermost surface. Contact angle test, scanning electron microscope analysis and electrochemical testing were carded out to characterize the surface, and a heat transfer experiment for dropwise condensation of steam was performed also. Results show that the modified surface bears a few Super-hydrophobic features, the static contact angle is higher than that in literatures, reaching 153.1±1.7°. The microscopic roughness can be seen in SEM images, differing much from H2O2 etched surface and bare copper surface. The condensation of steam on the surface is a typical form of dropwise condensation, in the measured range of temperature difference, under 0.1 MPa, the average convection heat transfer coefficients of the vertical surface are 1.7-2.1 times for those of film condensation. At the same time, the inhibition efficiency of surface is improved to some extent comparing with the same kind of SAMs, which suggests that the lifetime of maintenance dropwise condensation would have the possibility to surpass the existing record. 展开更多
关键词 Dropwise condensation Self-assembled monolayers Microscopic roughness Super-hydrophobic surface Heat transfer coefficient
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