共查询到20条相似文献，搜索用时 15 毫秒
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Yilun Li Duy Xuan Luong Jibo Zhang Yash R. Tarkunde Carter Kittrell Franklin Sargunaraj Yongsung Ji Christopher J. Arnusch James M. Tour 《Advanced materials (Deerfield Beach, Fla.)》2017,29(27)
The modification of graphene‐based materials is an important topic in the field of materials research. This study aims to expand the range of properties for laser‐induced graphene (LIG), specifically to tune the hydrophobicity and hydrophilicity of the LIG surfaces. While LIG is normally prepared in the air, here, using selected gas atmospheres, a large change in the water contact angle on the as‐prepared LIG surfaces has been observed, from 0° (superhydrophilic) when using O2 or air, to >150° (superhydrophobic) when using Ar or H2. Characterization of the newly derived surfaces shows that the different wetting properties are due to the surface morphology and chemical composition of the LIG. Applications of the superhydrophobic LIG are shown in oil/water separation as well as anti‐icing surfaces, while the versatility of the controlled atmosphere chamber fabrication method is demonstrated through the improved microsupercapacitor performance generated from LIG films prepared in an O2 atmosphere. 相似文献
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《Advanced Materials Technologies》2018,3(2)
The fabrication of long‐lived, durable, superhydrophobic surfaces using a manufacturable process is an important challenge for material science. Significant advances have been reported; however, many surfaces suffer from fragility, nonmanufacturable fabrication techniques, and temporal instability. Such challenges have limited commercial scale application of superhydrophobic films, including their application to water desalination where long lifetimes and durability are essential. The fabrication of controllably wettable surfaces formed from laser‐induced graphene is demonstrated in atmospheric conditions with contact angle control from 59° to 176°; representing some of the most superhydrophobic carbon surfaces ever reported. This superhydrophobicity is used to engineer a membrane with the largest pores ever reported for the energy efficient water desalination technique of air‐gapped membrane distillation. State‐of‐the‐art production of distilled water is observed, and no membrane failure or loss of superhydrophobicity is observed on a time‐scale of months—suggesting total water production capabilities well beyond anything yet demonstrated. 相似文献
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冰射流清洗设备料仓表面的覆冰常造成设备停机维修,但如何降低料仓表面的覆冰粘附力是目前研究的难点。本文采用CO2激光刻蚀聚四氟乙烯(PTFE)获得超疏水表面,并设计了一种菱形支撑肋阵列结构提高超疏水PTFE表面的耐磨性。CO2激光刻蚀能在PTFE表面形成多层次交错堆叠纤维结构,且激光刻蚀后的表面化学成分无明显变化。在50 μm激光扫描线间距、300 mm/s扫描速度和9 W激光功率下,可获得164°接触角、4°滚动角的超疏水PTFE表面。设计的30°顶角角度、3 mm菱形边长和0.05 mm肋边宽度的菱形支撑肋阵列结构可有效提高超疏水PTFE表面的耐磨性。即使被砂纸摩擦6 m后,具有菱形支撑肋阵列结构的超疏水PTFE表面仍能保持良好的超疏水性,且覆冰粘附力仅为普通PTFE表面的50%。本耐磨防覆冰PTFE表面有望应用于冰射流清洗设备。 相似文献
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由于超疏水表面在防腐、油水分离、流体减阻和液体转移方面的应用潜力,如何制作性能优异的超疏水表面成为研究热点。材料表面的形貌特征是决定其润湿性能的一个重要因素,因此,通常采用表面结构化来获得超疏水性能。在材料表面构织微纳结构方面,基于脉冲激光的微纳加工技术具有得天独厚的优势,尤其是在制作特定图案的复杂结构方面。本文根据激光器的脉冲宽度分类,通过刻蚀后材料表面形貌和润湿性特征对激光制作超疏水表面的基本理论和典型工艺方法进行介绍和总结,并对超疏水表面的发展前景作出展望。
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Guijun Li Xiaoyong Mo Yilin Wang Ching‐Yuen Chan Kang Cheung Chan 《Advanced Materials Interfaces》2019,6(18)
Advanced materials with high oil recycling capability plays a crucial role in rescuing marine lives from oil spill catastrophe. The existing absorption and filtration method can partially solve the challenge; however, a highly recyclable, low energy cost, and environmentally friendly method for collecting oil on open water is still missing. Herein, a novel concept, using newly developed membrane for collecting oil, with surface tension confinement and gravity is proposed. Using a 3D‐printed superhydrophobic and oleophilic membrane, this self‐floating device can selectively collect oil on water surfaces. The device can be automatically driven by a robot and achieves outstanding reusability toward oil recycling. This novel chemical concept will enable future research development of oil–water separation and oil recycling. 相似文献
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超疏水表面由于具有减阻、抗污、防水等独特性能,广泛应用于日常生活、军事、工业等场景,材料表面的微纳结构及化学成分对其超疏水性能有着重要影响。激光纹理化技术由于具有加工分辨率高、加工方式灵活、可加工材料多等优势,可用于制备疏水性能精确可控的表面微纳结构,在制造超疏水表面方面有着广阔的应用前景。首先,介绍了激光纹理化的作用机理,综述了常用的激光纹理化方式,如激光直接写入法、激光干涉图案化法及激光诱导周期性结构法等,并介绍了激光参数对微纳结构的影响。根据表面微纳结构的形貌、周期及尺寸特点对激光纹理化制备的表面分层微纳结构进行了总结归纳,包括覆盖随机纳米结构或激光诱导周期性结构的微沟槽、微网格、微柱及微峰,重点介绍了分层微纳结构的制备方式及微纳结构对疏水性的影响。总结了提高分层微纳结构表面疏水性的后处理方式,包括环境老化、表面化学改性及热处理等,并介绍了后处理方式调控疏水性的作用机理。最后,对采用激光纹理化技术制备超疏水表面的应用前景进行了展望。 相似文献
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电刷镀-激光加工法制备耦合结构及复合特性研究 总被引：1，自引：0，他引：1
通过电刷镀-激光加工法在铝合金表面制备出特殊的复合结构,获得具有低黏附、耐腐蚀特性的超疏水表面,其对水的静态接触角达到155.1°,滚动角小于5.6°。利用扫描电子显微镜(SEM)、光学显微镜、接触角测量仪(OCA15Pro)和X射线衍射仪(XRD)表征表面的形貌结构、润湿特性和物相组成,并通过腐蚀性实验对表面的耐腐蚀性能进行研究。结果表明:制备表面是一种带有孔洞的沟槽与菜花状的凸包簇形成的复合结构,并且各凹槽与凸包结构均为定尺寸分布。电刷镀处理使表面物相组成相对于基体表面发生明显变化,进一步的激光加工使峰值强度增强,材料组织发生细化现象;耦合方法所制备表面的耐腐蚀性也得到改善。 相似文献
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Dew collection is a promising strategy to address the water scarcity problem in arid regions. Inspired by the natural species, engineering superhydrophilic/superhydrophobic hybrid (SSH) surfaces has received much attention for water harvesting in recent years. However, it is still challenging to design a surface that is capable of fast condensate droplet capture and directional droplet transport, both of which are essential for efficient dew harvesting at low subcooling conditions. Herein, a convenient, straightforward method to fabricate SSH surfaces with superhydrophilic (SHPi) triangular patterns on the superhydrophobic (SHPo) substrates by using a laser ablation approach is presented. The triangle spacing is optimized to delicately control condensate droplet nucleation and directional water transport. It is found that water collection performance on the SSH surfaces exhibits remarkable dependence on the triangle spacing. The SSH surface with a triangle spacing of 1.5 mm enables fast condensate droplet nucleation, directional transport, and efficient departure, yielding an ≈54% or ≈21% enhancement of water collection rate compared to the uniform SHPo or SHPi surfaces. This study of exploiting multiple coupling effects of the surface features to enhance dew collection efficiency can provide important insights for developing high‐performance water‐harvesting systems via dew. 相似文献
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Yan Huangping Mohamed Raiz B Abdul Rashid Si Ying Khew Li Fengping Hong Minghui 《光电工程》2017,44(6):587-592
Superhydrophobic surfaces have attracted extensive interests and researches into their fundamentals and potential applications. Laser texturing provides the convenience to fabricate the hierarchical micro/nanostructures for superhydrophobicity. However, after laser texturing, long wettability transition time from superhydrophilicity to superhydrophobicity is a barrier to mass production and practical industrial applications. External stimuli have been applied to change the surface composition and/or the surface morphology to reduce wettability transition time. Herein, by temperature tuning, wettability transition of laser textured brass surfaces is investigated. Scanning electron microscopy and surface contact angle measurement are employed to characterize the surface morphology and wettability behavior of the textured brass surfaces. By low-temperature heating (100 ℃~150 ℃), partial deoxidation of the top CuO layer occurs to form hydrophobic Cu2O. Therefore, superhydrophobicity without any chemical coating and surface modification could be achieved in a short time. Furthermore, after low-temperature heating, the low adhesive force between the water droplet and the sample surface is demonstrated for the laser textured brass surface. This study provides a simple method to fabricate the micro/nanostructure surfaces with controllable wettability for the potential applications. 相似文献
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目的 采用飞秒激光刻蚀硅橡胶表面,获得表面结构较优、润湿性能与防冰性能优异的超疏水硅橡胶表面.方法 通过控制变量,设计单因素试验,研究飞秒激光参数(填充间距、能量密度、扫描速度)对硅橡胶表面结构的影响规律.基于正交试验设计和极差分析获得使表面结构规整且表面粗糙度最大的相对最优工艺参数,研究飞秒激光参数对表面粗糙度的影响主次顺序.结果 飞秒激光刻蚀硅橡胶的相对最佳工艺参数如下:能量密度为 5 J/cm2,扫描速度为200 mm/s,填充间距为 20 μm.最优参数组下激光刻蚀的超疏水硅橡胶表面粗糙度达到最大值 5.954 μm,具有规整的峰状凸起与微纳结构和优异的超疏水性能,水接触角高达165.3°,滚动角低至 2.6°.该超疏水硅橡胶表面具有优异的防冰性能,在低温高湿环境下,与未处理的硅橡胶表面相比,结冰时间由67 s延长至 312 s,冰黏附强度由39.6 kPa降低至 7.4 kPa.超疏水硅橡胶还具有良好的循环除冰性能,经 20次结冰/除冰循环后,冰黏附强度仍不超过20 kPa;此外,该表面还具有优异的耐腐蚀性能和良好的耐磨损性能.结论 飞秒激光增大能量密度和减小扫描速度会使激光刻蚀宽度增大,要避免纵向条纹,应控制填充间距不超过激光刻蚀宽度.激光参数优化后刻蚀出的超疏水硅橡胶表面具备优异的防冰性能,并且机械与化学稳定性较好,在恶劣环境中的防冰领域,具有广阔的应用前景. 相似文献
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Zhibing Zhan Zihao Li Xiaoyun Li Erik Garcell Subhash Singh Mohamed ElKabbash Chunlei Guo 《Advanced Materials Interfaces》2019,6(16)
In this work, a scalable thermal imprinting method that allows to directly fabricate superhydrophobic polymer surfaces with superstrong resistance to harsh cleaning and mechanical abrasion is reported. A titanium (Ti) mold is produced by femtosecond laser processing to possess a hierarchical micro‐ and nanoscale pattern. Through thermal imprinting, this hierarchical pattern onto poly(propylene) sheets is able to be accurately reproduced, rending the polymer surface superhydrophobic. The imprinting method employed uses an aqueous ethanol solution of stearic acid to assist demolding, and periodically uses xylene to limit mold contamination and restore the mold to excellent condition for further imprinting. These strategies allow to repeatedly use the mold over 50 times without degradation. A range of durability tests are further performed, and showed that the produced suprehydrophobility on the poly(propylene) sheets exhibit excellent durability, withstanding brush washing, ultrasound cleaning, and sandpaper abrasion. The reported method can also be used to fabricate superhydrophobic surfaces of various thermoplastics that are broadly utilized in daily life. 相似文献
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为了使Ti6Al4V合金具有超疏水特性,采用激光技术加工规则点阵状纹理,然后采用自组装技术在试样表面制备自组装分子膜,得到了超疏水Ti6Al4V表面.激光加工构造的微米级点阵结构规整,形成了具有一定高度的类似锥台或柱状的凸起.通过激光加工和沉积自组装分子膜,Ti6Al4V试样表面的水接触角显著增大,最大可达到151°.将测得的接触角与分别用Wenzel模型和Cassie模型计算的理论值进行比较,实测结果更接近Cassie模型的结果.通过改变激光加工表面微结构的参数,可以控制表面接触角的大小.随着表面粗糙度值的增大,接触角呈增大趋势.当表面粗糙度大于4μm时,接触角均大于150°,形成超疏水表面. 相似文献
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综述了在高分子材料表面固定生物分子以增强其生物医学应用性能的光化学方法,该方法适用的生物分子有蛋白质和白蛋白,多糖类如肝素,其它如酶,抗体,多肽类,DNA片段等。此方法不会影响高分子材料的本位性能,可基本保持所固定的生物分子的活性,还可以设计材料表面改性区域,经改性的高分子材料可获得良好的生物相容性和多种优良的生物医学应用性能。 相似文献
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