Coatings
·
2021
·Vol. 11
·期 5
·494
·
IF 2.881
Chenchen Jiang,Xue Han,Juanjuan Wang,Lele Li,Enping Liu,Conghua Lu
In this paper, we present a simple and versatile method to dynamically and reversibly tailor surface wrinkles on a floating polymer film by combining a magnetic droplet and neodymium magnet. The magnetic force from the attraction of the neodymium magnet to the magnetic droplet is the main reason for surface instabilities of floating polymer films, which can induce radial stress in the radial direction, and further, compressive stress in the circumferential direction. This compressive stress can trigger not only floating film wrinkling but also a wrinkle-fold transition. Surface morphologies on the floating polymer film have been systematically studied, by varying the distance between the magnetic droplet and neodymium magnet, polymer film thickness, and magnetic droplet volume. With the decrease in the distance between a magnetic droplet and a neodymium magnet, the decrease in polymer film thickness, and the increase in the magnetic droplet volume, the wrinkle numbers increase and even a wrinkle-fold transition happens. Additionally, the coupling effect of multiple magnetic droplets on the floating film has also been used to achieve novel surface wrinkle patterns, which greatly widens the applications of surface wrinkling.Keywords:surface wrinkling;floating polymer films;dynamical reversible wrinkles;magnetic field
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Extreme Mechanics Letters
·
2021
·
IF 4.567
Qi Li,Ping Zhang,Canhui Yang,Huiling Duan,Wei Hong
On-demand adhere to and detach from soft and wet surfaces are crucial for hydrogels for applications in tissue engineering , soft machines, and soft robotics. Whereas strong adhesion has been achieved between hydrogels, on-demand switching from strong adhesion to weak adhesion for benign detachment is still under explorations. Herein, we report an approach for switchable adhesion between hydrogels by invoking a mechanical process, wrinkling. The approach is demonstrated by bonding two hydrogel adherends with a wrinkled hydrogel adhesive , with the formation and characterizations of wrinkles tailored by regulating the prestretch of adherend and optimizing the ingredients of adhesive synergistically. On one hand, the formation of wrinkles enhances adhesion by creating a tortuous path for crack propagation and an extended energy dissipation zone. The resulting adhesion is robust to elicit bulk dissipation within the adherend and transform the once adhesive failure to cohesive failure . On the other hand, the suppression of wrinkles deactivates the adhesion enhancement mechanism to facilitate effortless debonding. As a proof-of-concept, a hydrogel patch that can strongly adhere to a damaged hydrogel device for repair and gently detach after repairing, based on the switchable hydrogel adhesion, is demonstrated. The proposed method expands the design space for hydrogel adhesion.
研究领域:
生物医学工程
·
材料科学
·
组织工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Renjie Ding,Haowen Zheng,Xu Zhao,Fuhua Xue,Pengyang Li,Jinhua Xiong,Zhong Chen,Zonglin Liu,Qingyu Peng,Xiaodong He
The excellent chemical, mechanical or physical functionalities of two-dimensional nanomaterials can be better performed by assembling two-dimensional nanosheets into crumpled structures. Herein, inspired by the wrinkles on human skin, we demonstrated a simple method to create out-of-plane crumpled surface morphology based on the expanding-shrinking process of tissue. The unique crumpled structure largely raises the fracture strain of Ti 3 C 2 T x MXene/Tissue composite film , which reaches 30.48%, while the tensile strength also shows an increasement to 28.63 MPa. The EMI shielding performance improved by the internal scattering achieves 77.0 dB. With vertically aligned Ti 3 C 2 T x nanosheets formed by the crumples, the through-plane thermal conductivity reached 1.12 W m −1 K −1 is obtained. Moreover, the enhanced photothermal conversion performance caused by the large specific surface area improves the solar-driven water evaporation rate to 1.85 kg m -2 h −1 . This work exhibits a novel method for fabricating multifunctional crumpled Ti 3 C 2 T x MXene composite film.
研究领域:
材料科学
·
纳米技术
·
能源与环境
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 12
·2897-2908
·
IF 4.696
Jun Peng,Yuxiu Xing,Kai Xu,Weihong Lin,Jiancheng Wu,Zhiwei Yu,Youxiong Zhang,Mingcai Chen
In this work, a facile strategy to fabricate double-layer nano-wrinkled structures by coupling the polymeric surface onto silsesquioxane rigid templates has been proposed. Aza-Michael addition was applied to construct the bulk layer by using octakis(aminophenyl) silsesquioxane (OAPS) and decakis(methacryloxypropyl) silsesquioxane (CMSQ-T10). Subsequently, a top layer was fabricated through free-radical polymerization of octakis(methacryloxypropyl) silsesquioxane (CMSQ-T8) and hexafluorobutyl acrylate (HFBA). For the first time, well defined nanoisland structures were achieved via reaction-induced assembly of two kinds of silsesquioxane cages in the rigid layer, which could further serve as an in situ template or a scaffold for top polymerization. As a result, the template role of the bulk layer and compressive stress caused by mismatch of different volumetric shrinkages of reactions between top and bulk layers led to the double-layer nano-wrinkled structures, which could be observed using a Field Emission Scanning Electron Microscope (FE-SEM) and an Atomic Force Microscope (AFM). Moreover, by tuning bilayer formulations, controllable nano-wrinkled structures can be obtained. The minimum reflectance of resulting nano-wrinkled surface is decreased to 3.51 ± 0.03% (maximum transmittance 98.51 ± 0.02%). Furthermore, the resulting surface shows obvious hydrophobicity and superior thermal stability, thus suggesting its potential use as antireflective surfaces in optical devices, solar cells and various optoelectronic devices.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2011
·
IF 4.269
Tao Zhao,Dong Qiu
A facile method of preparing highly folded cross-linked polymeric microparticles has been developed via one-pot suspension polymerization under high-speed homogenization. The wrinkles result from the evaporation of solvent in the cross-linked microparticles. The effects of microparticle cross-linking density and solvent on the polymer have been studied in detail. It was found that a medium cross-linking density (DVB/St = 0.5 by weight) is optimal for producing the most folded surface and the higher the solvent content, the deeper the surface wrinkles. This method is very simple and in principle can be applied to produce wrinkled microparticles with other chemical compositions.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2020
·
IF 3.83
Jinfeng Yan,Yanan Ma,Xingxing Li,Chuankun Zhang,Minglei Cao,Wei Chen,Shijun Luo,Meng Zhu,Yihua Gao
Due to the portability, good flexibility and excellent sensing performance, flexible piezoresistive sensors have received great attention in the field of transient electronic skin, intelligent robots and human-machine interaction. However, achieving both high sensitivity and wide sensing range by low-cost and large-scale method still remains a key challenge for developing high performance piezoresistive sensors. Here, a flexible and highly sensitive piezoresistive sensor was designed and realized by combining the 2D MXene material with wrinkle structure. The MXene composite based sensor with wrinkle structure was fabricated by spraying the active material onto the surface of a pre-stretched polyacrylate tape, which is facile, efficient and low-cost. The MXene composite based sensor demonstrates high sensitivity (148.26 kPa −1 ), wide pressure range (up to 16 kPa), short response time (120 ms) and excellent durability (>13000 cycles). Moreover, benefiting from the extraordinary sensing performance and flexibility, the sensor can detect human physiological signals, monitor intelligent robot postures and map spatial pressure distributions, thus exhibiting great potential in physiological analysis systems, humanoid robotics and biomedical prostheses.
研究领域:
材料科学
·
生物医学工程
·
机器人技术
✓ 已验证
DOI
高影响因子
Nano-Micro Letters
·
2023
·Vol. 16
·期 1
·1-13
·
IF 26.6
Xiao Guang,Li Hao,Yu Zhizhou,Niu Haoting,Yao Yagang
Highly thermally conductive composite films with elimination of graphene nanosheet wrinkles prepared by a constrained drying strategy of in-plane stretching.
Reveals the mechanism of graphene nanosheet wrinkle elimination to improve the thermal conductivity of composite films and demonstrates its use as a heat sink film for cooling flexible LED chips and smartphones.
研究领域:
材料科学
·
热管理技术
·
纳米科技
✓ 已验证
DOI
高影响因子
Research
·
2019
·
IF 0
Ting He,Bingzhang Lu,Yang Chen,Yong Wang,Yaqiang Zhang,John L. Davenport,Alan P. Chen,Chih-Wen Pao,Min Liu,Zhifang Sun,Alexander Stram,Alexander Mordaunt,Jairo Velasco,Yuan Ping,Yi Zhang,Shaowei Chen
Rational design of single-metal atom sites in carbon substrates by a flexible strategy is highly desired for the preparation of high-performance catalysts for metal-air batteries. In this study, biomass hydrogel reactors are utilized as structural templates to prepare carbon aerogels embedded with single iron atoms by controlled pyrolysis. The tortuous and interlaced hydrogel chains lead to the formation of abundant nanowrinkles in the porous carbon aerogels, and single iron atoms are dispersed and stabilized within the defective carbon skeletons. X-ray absorption spectroscopy measurements indicate that the iron centers are mostly involved in the coordination structure of FeN4, with a minor fraction (ca. 1/5) in the form of FeN3C. First-principles calculations show that the FeNx sites in the Stone-Wales configurations induced by the nanowrinkles of the hierarchically porous carbon aerogels show a much lower free energy than the normal counterparts. The resulting iron and nitrogen-codoped carbon aerogels exhibit excellent and reversible oxygen electrocatalytic activity, and can be used as bifunctional cathode catalysts in rechargeable Zn-air batteries, with a performance even better than that based on commercial Pt/C and RuO2 catalysts. Results from this study highlight the significance of structural distortions of the metal sites in carbon matrices in the design and engineering of highly active single-atom catalysts.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
Chemistry-An Asian Journal
·
2021
·Vol. 16
·期 22
·3743-3747
·
IF 4.568
Min-Jie Chen,Gang-Gang Chang,Li-Yan Chen,Ke-Xin Huang,Chun Pu,Dan Li,Yao Yao,Jia-Xin Li,Xiao-Yu Yang,Banglin Chen
Graphical The core-shell catalyst with surface wrinkles greatly improves the selectivity of tandem catalysis. Process intensification, targeting the maximization of spatial-temporal productivity utilizing minimum energy and resources has always been the constant trends especially in chemical industry. In this regard, tandem reactions that are able to perform a multi-step reaction in a single pot by eliminating costly separation steps have been viewed as a typical paradigm. However, a spatial isolation of varied active sites with a controlled manner in a single catalyst to avoid deactivation and work synergistically is a challenging problem yet sometimes being overlooked. In this work, a spatial base-metal core-shell structured catalyst with wrinkled surface was successfully fabricated by a direct homoepitaxial growth method in an acid/water system, which exhibited increased hydrophobicity, exposure of active sites and significantly improved product selectivity towards one-pot Knoevenagel condensation-hydrogenation tandem reaction compared with the uncoated catalyst. Meanwhile, the catalytic performance was largely retained and the structural stability was maintained even after successive 8 cycles, which shows great promise for industrial applications.
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Xi Wang,Keshuai Hu,Juanjuan Wang,Xue Han,Xiaopeng Li,Fan Xu,Yanping Cao,Conghua Lu
Dynamic oriented wrinkling especially on arbitrary film materials is highly desirable yet remains a great challenge. Here, fabrication of programmable aligned wrinkling patterns on different film/substrate systems via a laser-direct-writing (LDW) method is reported, regardless of photofunctionality and transparence of the target films. The key is related to smart introduction of photothermal materials (PTMs) into compliant substrates and even as an independent attachable/detachable layer assembled underneath the film/substrate systems. Experiments and theoretical modeling reveal that with the help of the photothermal effect of PTMs, in situ LDW-induced localized dynamic anisotropic stress field is responsible for the intriguing LDW path-parallel aligned wrinkling. Furthermore, dimensional analysis is carried out and explicit solutions quantifying the connection of wrinkling morphology parameters with the LDW conditions are derived for the first time, which enables theoretical pattern designing. It is highlighted that the attachable/detachable assembly strategy for the independent PTMs layer endows arbitrary film/substrate systems with on-demand photosensitivity when needed, which has been inaccessible previously. As demonstrated, these dynamic oriented wrinkling systems have found broad applications especially in smart soft photonics, e.g., information storage, anticounterfeiting, and responsive optical devices.
研究领域:
材料科学
·
光学工程
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Xue Zhong,Weicheng Jiao,Wenbo Liu,Rongguo Wang,Xiaodong He
Flexible pressure sensors have attracted great interest as they play an important role in various fields such as health monitoring and human–machine interactions. The design of the pressure sensors still faces challenges in achieving a high sensitivity for a wide sensing range, and the interference of water restricts the applications of the sensors. Herein, we developed a graphene–polydimethylsiloxane film combining a hierarchical surface with nanowrinkles on it and a hollow structure. The microstructure design of the composite can be facilely controlled to improve the sensing and hydrophobic performance by tailoring the microsphere building units. Attributed to the irregular surface and hollow structure of the sensing layer, the optimized sensor exhibits a superior sensitivity of 1085 kPa–1 in a 50 kPa linear range. For practical applications, the nanowrinkles on the surface of the microspheres and the polymer coating endow the composite with waterproof properties. Inspired by the dual receptors of the skin, two designed microstructured films can simply integrate into one with double-sided microstructures. The sensing performance and the water-repellence property allow the sensor to detect physiological signals under both ambient and underwater conditions. Furthermore, underwater stimuli detection and communication are demonstrated. This method of fabricating a flexible sensor shows great potential in wearable and robotic fields.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hongen Chen,Jianzhuang Shi,Changbin Ji,Wenxin Fan,Kunyan Sui
The construction of surface microstructures (e.g., micropyramids and wrinkles) has been proven as the most effective means to boost the sensitivity of ionic skins (I-skins). However, the single-scale micronano patterns constructed by the common fabrication strategy generally lead to a limited pressure-response range. Here, a convenient repeated stretching/coordinating/releasing strategy is developed to controllably construct multiple graded wrinkles on the polyelectrolyte hydrogel-based I-skins for increasing their sensitivity over a broad pressure range. We find that the small wrinkles allow for high sensitivity yet small pressure detection range, while the large wrinkles can reduce structural stiffening to generate large pressure-response range but incur limited sensitivity. The multiple graded wrinkles can combine the merits of both the small and large wrinkles to simultaneously improve the sensitivity and broaden the pressure-response range. In particular, the sensing performance of multiple-wrinkle-based I-skins substantially outperforms the superposition of the sensing performance of different single-wrinkle-based I-skins. As a proof of concept, the triple-wrinkle-based I-skins can provide an extremely high sensitivity of 17,309 kPa–1 and an ultrawide pressure detection range of 0.38 Pa to 372 kPa. The approach and insight contribute to the future development of I-skins with a broader pressure-response range and higher sensitivity.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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