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Effects of Multi‐Scale Patterning on the Run‐In Behavior of Steel–Alumina Pairings under Lubricated Conditions 
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下载免费PDF全文 Philipp G. Grützmacher Andreas Rosenkranz Adam Szurdak Carsten Gachot Gerhard Hirt Frank Mücklich 《Advanced Engineering Materials》2018,20(1)
In nature, many examples of multi‐scale surfaces with outstanding tribological properties such as reduced friction and wear under dry friction and lubricated conditions can be found. To determine whether multi‐scale surfaces positively affect the frictional and wear performance, tests are performed on a ball‐on‐disk tribometer under lubricated conditions using an additive‐free poly‐alpha‐olefine oil under a contact pressure of around 1.29 GPa. For this purpose, stainless steel specimens (AISI 304) are modified by micro‐coining (hemispherical structures with a structural depth of either 50 or 95 μm) and subsequently by direct laser interference patterning (cross‐like pattern with 9 μm periodicity) to create a multi‐scale pattern. The comparison of different sample states (polished reference, laser‐patterned, micro‐coined, and multi‐scale) shows a clear influence of the fabrication technique. In terms of the multi‐scale structures, the structural depth of the coarser micro‐coining plays an important role. In case of lower coining depths (50 μm), the multi‐scale specimens show an increased coefficient of friction compared to the purely micro‐coined surfaces, whereas larger coining depths (95 μm) result in stable and lower friction values for the multi‐scale patterns. 相似文献
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This work presents an approach to create mechanical undulations at a solid organic coating surface under the influence of an electric field. The coating is fabricated through polymerization of chiral reactive mesogens aligned in their fingerprint mode on top of interdigitated electrodes. The fingerprint mode gives a corrugation of the surface perpendicular to the helix axes. When a lateral alternating electric field is applied, the order parameter of the helicoidally packed mesogens is reduced. This simultaneously leads to an inversion of the fingerprint heights, an overall thickness increase, and a chaotic and fast surface oscillation. These three effects work in concert stimulating wavy deformation figures at the coating surface. The process is fast and reversible; the dynamics of the topographic textures stop immediately when the electric field is switched off. The continuous generation of surface undulations sustains transport of species at the coating surface. It removes dust and debris providing an active dust control. 相似文献
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Kateryna Lyakhova A. Catarina C. Esteves Marcel W. P. van de Put Leo G. J. van der Ven Rolf A. T. M. van Benthem Gijsbertus de With 《Advanced Materials Interfaces》2014,1(3)
To investigate self‐replenishing on surface‐structured composite coatings a dual simulation‐experimental approach is employed to study the decisive role of polymer‐air and polymer‐particle interfaces. Experimentally, the composite system consists of a cross‐linked polymer network with fluorinated‐dangling chains, embedding colloidal SiO2 nanoparticles which are incorporated in the network via covalent bonding. These particles provide the desired surface structure at the air‐interface before and after damage. Any damage replicates the rough surface, while the polymer layer on top of the particles serves as source of low surface energy groups which are able to reorient towards the new air‐interfaces. Using coarse‐grained simulations details of these self‐replenishing composite systems are revealed such as the minimum thickness of the polymer layer necessary for providing optimal self‐replenishing ability and the distribution profile of the dangling chains at the various interfaces. The principles and dual approach reported here may be applied to other self‐healing composite systems with applications in self‐cleaning, anti‐fouling or low adhesion materials. 相似文献
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In the past few decades, the self‐healing surface materials with durable mechanical, functional, and structural properties have attracted enormous research interests, which exhibit great potential in energy conversion devices, sensors, electronic skins, superhydrophobic fabrics, medical/biological hydrogel, and a protective coating. Despite the remarkable progresses achieved in the self‐healing surface, the systematic and overall reviews that focus on self‐healing surface materials are still lacking and in urgent need. Herein, the recent advances in the development of self‐healing surface materials are summarized. The surface damage forms that composed of cracks, scratches, punctures, and surface wear, are systematically reviewed. The self‐healing mechanism and methods at interface are then introduced to briefly explain the basic design principle. The recent developments of functional surfaces including superhydrophobic, oleophobic, antifogging, anti‐icing, antibiofouling, and anticorrosion surfaces with self‐healing functions are further discussed. Finally, the contemporary challenges, and the future perspectives that motivate are proposed to create more innovative self‐healing materials for diverse fields. 相似文献
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Zhengjia Ji Guoxin Xie Wenhu Xu Shuai Wu Lin Zhang Jianbin Luo 《Advanced Materials Interfaces》2019,6(10)
Oil stain self‐cleaning and anti‐adhesion at the contacting interface between planar surfaces is a worldwide challenge and is rarely explored. Inspired by the low adhesion of Coccinella septempunctata to rough nanoporous substrates, it is attempted to reduce adhesion between the contacting interfaces of polymer composite due to the oil stain by constructing porous structures. A facile method is proposed to fabricate porous polymer composites by adding zeolite microparticles. Zeolite microparticles are used as oil cleaner to build the self‐cleaning system. The surface morphology, the mechanical properties, the anti‐adhesion and lubrication properties of the polymer composites are studied. It is suggested that the porous structure possesses self‐cleaning and high mechanical strength in ambient conditions. In addition, the excellent anti‐adhesion behavior can be realized due to the absorption of oil stain of the porous structure in the composite. The results show that the synergistic interaction of the roughness and the oleophilic properties decrease the adhesion between two planar surfaces under the oil stain condition. The present work provides a new route for the development of anti‐adhesion materials. 相似文献
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Thin-film Bragg stacks exhibiting structural color have been fabricated by a layer-by-layer (LbL) deposition process involving the sequential adsorption of nanoparticles and polymers. High- and low-refractive-index regions of quarter-wave stacks were generated by calcining LbL-assembled multilayers containing TiO(2) and SiO(2) nanoparticles, respectively. The physical attributes of each region were characterized by a recently developed ellipsometric method. The structural color characteristics of the resultant nanoporous Bragg stacks could be precisely tuned in the visible region by varying the number of stacks and the thickness of the high- and low-refractive-index stacks. These Bragg stacks also exhibited potentially useful superhydrophilicity and self-cleaning properties. 相似文献
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Takashi Kamegawa Yuki Shimizu Hiromi Yamashita 《Advanced materials (Deerfield Beach, Fla.)》2012,24(27):3697-3700
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Hongliang Liu Pengchao Zhang Mingjie Liu Shutao Wang Lei Jiang 《Advanced materials (Deerfield Beach, Fla.)》2013,25(32):4477-4481
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Liang Chen Xiaoying Sun Jianzhong Hang Lujiang Jin Dan Shang Liyi Shi 《Advanced Materials Interfaces》2016,3(6)
The practical applications of superhydrophobic self‐cleaning surfaces have been hampered by poor mechanical durability. Here, a composite coating that possesses excellent superhydrophobicity and robust mechanical durability is fabricated, consisting of a methyl silicone resin and a superhydrophobic silica sol. The coating can be sprayed, dipped, rolled, or flowed onto various substrates, such as glass, metal, paper, and cloth, for large‐scale applications. The coating exhibits remarkable superhydrophobicity even after undergoing a finger‐wipe test, a knife‐scratch test, or 50 abrasion cycles with sandpaper. Moreover, the coating on hard substrates exhibits high rigidity (pencil hardness of 9H), good flexibility (impact resistance of 1 m•kg) and great adhesion (5B). 相似文献
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《Advanced Materials Interfaces》2018,5(12)
One of the promising strategies to achieve high performance flexible electronics is to integrate high performance components (micro‐electro‐mechanical systems, integrated circuit, etc.) on a flexible substrate. The heterointegration of fragile high performance components, for example, thinned down 100 GHz silicon technology, necessitate however methodologies to place these components on the substrate while exerting as little force as possible to prevent any damage from occurring. In this work, a novel approach is presented for component positioning by capillary assembly on a smart flexible substrate composed of two layers of polymers. It is shown how the wettability of the surface can be engineered by combining stretching induced deformation of the top layer with plasma treatment. Using magnetically actuated ferrofluid droplets which carry the silicon chip shows how it can be aligned and deposited at predetermined sites on these substrates. It is demonstrated that unlike standard capillary alignment which relies on a hydrophobic/hydrophilic contrast, in this case deposition is controlled by surface adhesion contrast between the site and the rest of the substrate. Furthermore, it is explained how deposition sites can be selectively activated through localized stretching thus producing generic smart substrates on which precise depositions sites can be activated according to the needs of the end user. 相似文献