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期刊论文 9

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Stavax钢 1

可切换移相器 1

可重构超表面 1

弦切面 1

扫描阵列 1

接触角 1

毛竹 1

毫米波天线 1

润湿性 1

疏水性 1

皮秒激光 1

立杆高度 1

表面纹理处理 1

高分子聚合物 1

龙伯透镜 1

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Functional flax fiber with UV-induced switchable wettability for multipurpose oil-water separation

《环境科学与工程前沿(英文)》 2022年 第16卷 第12期 doi: 10.1007/s11783-022-1588-6

摘要:

● A PAA-ZnO-HDTMS flax fiber with UV-induced switchable wettability was developed.

关键词: Flax fiber     Switchable wettability     ZnO-HDTMS coating     Oil-water separation    

Electroconductive RGO-MXene membranes with wettability-regulated channels: improved water permeability

《环境科学与工程前沿(英文)》 2023年 第17卷 第1期 doi: 10.1007/s11783-023-1601-8

摘要:

● Electroconductive RGO-MXene membranes were fabricated.

关键词: Reduced graphene oxide     MXene     Membrane     Water permeance     Dye rejection     Electro-assistance    

Seasonal variations in leaf capturing of particulate matter, surface wettability and micromorphology

Huixia WANG, Hui SHI, Yangyang LI, Ya YU, Jun ZHANG

《环境科学与工程前沿(英文)》 2013年 第7卷 第4期   页码 579-588 doi: 10.1007/s11783-013-0524-1

摘要: The seasonal changes in leaf particulate matter (PM) accumulation, surface wettability and micromorphology in urban tree species, including ( . ), ( . ) and ( . ), were studied during a single growing season. The three species showed distinct seasonal trends in PM accumulation, increasing from spring to autumn (or winter) even during the rainy season, but at different rates. During the study, the leaf PM retention amount of , a species with ridged leaf surfaces, was significantly higher than that of and , species with waxy leaf surfaces. The contact angles of water droplets on leaves decreased with leaf age except on the abaxial surface of , which remained non-wettable or highly non-wettable throughout the growing season; the decrease in the contact angle on adaxial surface of was greater when compared with and . A significant and negative relationship existed between leaf PM retention amounts and contact angles on adaxial surface of leaves of all three species. The increase in wettability, probably caused when epicuticular wax was destroyed by mechanical and chemical abrasion, seemed to be the main factor leading to seasonal variations in leaf PM accumulation.

关键词: contact angle     particulate matter     retention amount    

不同立杆高度毛竹材弦切面的润湿性能研究

张巧玲,周洪伟,梁廷斌,仝雪艳,曾钦志

《中国工程科学》 2014年 第16卷 第4期   页码 56-59

摘要:

本文研究了H2O、酚醛树脂胶黏剂(PF)、脲醛树脂胶黏剂(UF)和改性大豆蛋白胶(MSA)在毛竹材不同立杆高度弦切面的润湿性能,通过测定这些润湿液体在竹材弦切面上的接触角,建立润湿液体在毛竹材弦切面的动态润湿模型,分析毛竹材的不同高度对润湿液体动态润湿性能的影响,并对比分析各种润湿液体在毛竹材弦切面的润湿性能差异。

关键词: 毛竹     立杆高度     弦切面     接触角     润湿性    

Numerical studies of dynamic behavior of liquid film on single-layer wire mesh with different wettabilities

《化学科学与工程前沿(英文)》   页码 1672-1680 doi: 10.1007/s11705-022-2205-8

摘要: Droplet impacting on the stainless steel wire mesh is very common in chemical devices, like a rotating packed bed. Surface wettability of wire mesh significantly affects the liquid flow pattern and liquid dispersion performance. However, the effect of surface wettability on the impaction phenomena at microscale such as liquid film is still unknown. In this work, the dynamic behavior of liquid film on the surface of wire mesh was analyzed by computational fluid dynamics simulation. The dynamic behavior of liquid film on the surface of wire mesh can be divided into the following three steps: (1) spreading step; (2) shrinkage process; (3) stabilizing or disappearing step. Effects of surface wettability, as well as operating conditions, on wetting area and liquid film thickness were studied. Compared to the hydrophilic wire mesh, the final wetting area of hydrophobic wire mesh is zero in most cases. The average liquid film thickness on the surface of hydrophilic wire mesh is 30.02–77.29 μm, and that of hydrophobic wire mesh is 41.76–237.37 μm. This work provided a basic understanding of liquid film flow at microscale on the surface with various surface wettabilities, which can be guiding the packing optimization and design.

关键词: stainless steel wire mesh     computational fluid dynamics     surface wettability     liquid film     impacting    

A concept of capillary active, dynamic insulation integrated with heating, cooling and ventilation, air conditioning system

Mark BOMBERG

《结构与土木工程前沿(英文)》 2010年 第4卷 第4期   页码 431-437 doi: 10.1007/s11709-010-0071-9

摘要: When a historic fa?ade needs to be preserved or when the seismic considerations favor use of a concrete wall system and fire considerations limit exterior thermal insulation, one needs to use interior thermal insulation systems. Interior thermal insulation systems are less effective than the exterior systems and will not reduce the effect of thermal bridges. Yet they may be successfully used and, in many instances, are recommended as a complement to the exterior insulation. This paper presents one of these cases. It is focused on the most successful applications of capillary active, dynamic interior thermal insulation. This happens when such insulation is integrated with heating, cooling and ventilation, air conditioning (HVAC) system. Starting with a pioneering work of the Technical University in Dresden in development of capillary active interior insulations, we propose a next generation, namely, a bio-fiber thermal insulation. When completing the review, this paper proposes a concept of a joint research project to be undertaken by partners from the US (where improvement of indoor climate in exposed coastal areas is needed), China (indoor climate in non-air conditioned concrete buildings is an issue), and Germany (where the bio-fiber technology has been developed).

关键词: capillary active insulation     integrated heating     cooling and ventilation     air conditioning (HVAC) and building enclosure     dynamic insulation     switchable thermal resistance     variable U-value walls    

用于5G的毫米波宽角扫描天线 Article

Raj Mittra, Abdelkhalek Nasri, Ravi Kumar Arya

《工程(英文)》 2022年 第11卷 第4期   页码 60-73 doi: 10.1016/j.eng.2021.10.017

摘要:

第五代(5G)网络通信系统主要工作在毫米波波段,预计可以提供数千兆的数据速率,这是目前使用无线服务(包括低于6 GHz的频段)所无法实现的。本文简要综述了几种现有的用于5G应用的毫米波相控阵设计。首先,介绍了低剖面天线阵列设计,包括固定波束和仅在一个平面上扫描波束的两种设计类型。随后,介绍了具有二维(2D)扫描能力的阵列系统,该系统对于大多数5G应用而言具有重要意义。接下来,在本文的主体部分,讨论了两种不同的扫描阵列设计策略,这两种策略都规避了用传统移相器来实现波束扫描。值得注意的是,因为在毫米波波段传统的移相器损耗高且价格昂贵,所以找到一个能替代传统移相器的器件是非常必要的;此外,诸如包括射频放大器在内的有源移相器等替代品也是既昂贵又耗电的。在此背景下,本文提出了两种不同的天线系统,这两种天线系统在毫米波范围内具有理想的2D扫描性能。第一种天线系统是龙伯透镜,该透镜由2D波导阵列或微带贴片天线阵列激励,以实现2D扫描能力。第二种天线系统是相控阵设计,该设计采用可切换的PIN二极管或变容二极管取代传统移相器,并将二极管插入波导中的辐射槽之间,从而为扫描提供所需的相移。最后,讨论了几种通过修改传统阵列配置来提高阵列增益的方法。本文还介绍了通过使用可重构的超表面类型的面板来实现一维(1D)和2D扫描的新技术。

关键词: 龙伯透镜     扫描阵列     毫米波天线     可切换移相器     可重构超表面    

Surface hydrophobicity: effect of alkyl chain length and network homogeneity

Wenqian Chen, Vikram Karde, Thomas N. H. Cheng, Siti S. Ramli, Jerry Y. Y. Heng

《化学科学与工程前沿(英文)》 2021年 第15卷 第1期   页码 90-98 doi: 10.1007/s11705-020-2003-0

摘要: Understanding the nature of hydrophobicity has fundamental importance in environmental applications. Using spherical silica nanoparticles (diameter= 369€±€7 nm) as the model material, the current study investigates the relationship between the alkyl chain network and hydrophobicity. Two alkyl silanes with different chain length (triethoxymethylsilane (C1) vs. trimethoxy(octyl)silane (C8)) were utilised separately for the functionalisation of the nanoparticles. Water contact angle and inverse gas chromatography results show that the alkyl chain length is essential for controlling hydrophobicity, as the octyl-functionalised nanoparticles were highly hydrophobic (water contact angle= 150.6°€±€6.6°), whereas the methyl-functionalised nanoparticles were hydrophilic (i.e., water contact angle= 0°, similar to the pristine nanoparticles). The homogeneity of the octyl-chain network also has a significant effect on hydrophobicity, as the water contact angle was reduced significantly from 148.4°€±€3.5° to 30.5°€±€1.0° with a methyl-/octyl-silane mixture (ratio= 160:40 µL·g nanoparticles).

关键词: hydrophobicity     surface energy     wettability     alkyl chain network     silica nanoparticle    

用于润湿性控制的Stavax 钢基材的皮秒激光表面纹理处理 Article

Xincai Wang, 郑宏宇, Yinchi Wan, Wenhe Feng, Yee Cheong Lam

《工程(英文)》 2018年 第4卷 第6期   页码 816-821 doi: 10.1016/j.eng.2018.10.006

摘要:

在本文中,笔者采用皮秒激光来制造Stavax钢基板的表面纹理,此钢基板为制造各种高分子聚合物产品模具的关键材料。在Stavax 钢基板上主要有3种类型的表面纹理:周期性波纹、微凸块的双尺度分层二维阵列以及有纳米波纹的微坑阵列。经激光处理后的Stavax钢基板表面的润湿性从其原始的亲水性转变为疏水性,甚至在暴露于空气后具有超疏水性。研究结果清晰地表明,此超疏水性主要是由于表面纹理造成的。超快激光诱导的催化效果可能在改变表面化学性质方面起到次要作用,从而降低了表面能。随后,将金属磨具表面上的经激光处理的表面纹理通过高分子聚合物注射成型工艺复制到聚丙烯基底。由此,聚丙烯模具表面的润湿性从原始的亲水性变成疏水性。此开发工艺在改善塑料制品的湿润控制性和易清洗性方面具有一定潜能。

关键词: 皮秒激光     表面纹理处理     Stavax钢     高分子聚合物     疏水性    

标题 作者 时间 类型 操作

Functional flax fiber with UV-induced switchable wettability for multipurpose oil-water separation

期刊论文

Electroconductive RGO-MXene membranes with wettability-regulated channels: improved water permeability

期刊论文

Seasonal variations in leaf capturing of particulate matter, surface wettability and micromorphology

Huixia WANG, Hui SHI, Yangyang LI, Ya YU, Jun ZHANG

期刊论文

不同立杆高度毛竹材弦切面的润湿性能研究

张巧玲,周洪伟,梁廷斌,仝雪艳,曾钦志

期刊论文

Numerical studies of dynamic behavior of liquid film on single-layer wire mesh with different wettabilities

期刊论文

A concept of capillary active, dynamic insulation integrated with heating, cooling and ventilation, air conditioning system

Mark BOMBERG

期刊论文

用于5G的毫米波宽角扫描天线

Raj Mittra, Abdelkhalek Nasri, Ravi Kumar Arya

期刊论文

Surface hydrophobicity: effect of alkyl chain length and network homogeneity

Wenqian Chen, Vikram Karde, Thomas N. H. Cheng, Siti S. Ramli, Jerry Y. Y. Heng

期刊论文

用于润湿性控制的Stavax 钢基材的皮秒激光表面纹理处理

Xincai Wang, 郑宏宇, Yinchi Wan, Wenhe Feng, Yee Cheong Lam

期刊论文