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self-healing coating

Woo-Sik Jang, Hyun Ji Kim, Chen Gao, Daeyeon Lee, Daniel A Hammer
Cell motility is central to processes such as wound healing, immune cell surveillance, and embryonic development. Motility requires the conversion of chemical to mechanical energy. An active area of research is to create motile particles, such as microswimmers, using catalytic and enzymatic reactions. Here, autonomous motion is demonstrated in adhesive polymer-based protocells by incorporating and harnessing the energy production of an enzymatic reaction. Biotinylated polymer vesicles that encapsulate catalase, an enzyme which converts hydrogen peroxide to water and oxygen, are prepared and these vesicles are adhered weakly to avidin-coated surfaces...
August 9, 2018: Small
Donglin Zhao, Xiaomeng Fan, Xiaowei Yin, Xiaoyu Cao, Jing Zhang
In this work, the self-healing Si-B-C matrix-modified ZMI-SiC fiber/SiC (SiC/SiC-SiBC) composite was prepared by a combined process of chemical vapor infiltration, slurry infiltration, and liquid silicon infiltration. The weight changes of the as-fabricate composite after oxidation at 800, 1000, and 1200 °C for 100 h were -0.41%, -0.06%, +0.05%, respectively. The corresponding strength retention ratios were 75%, 99%, 100%, respectively. With the increase of oxidation temperature, coating cracks would be closed...
August 7, 2018: Materials
Sovan Lal Banerjee, Koushik Bhattacharya, Sarthik Samanta, Nikhil K Singha
A self-healable antifouling hydrogel based on zwitterionic block copolymer was prepared via reversible addition-fragmentation chain transfer polymerization and Diels-Alder "click" chemistry. The hydrogel consists of a core-cross-linked zwitterionic block copolymer having poly(furfuryl methacrylate) as core and poly(dimethyl-[3-(2-methyl-acryloylamino)-propyl]-(3-sulfopropyl)ammonium) (poly(sulfobetaine)) as shell. The core was cross-linked with dithiobismaleimidoethane. The block copolymers were characterized by dynamic light scattering, field emission scanning electron microscopy, high-resolution transmission electron microscopy, atomic force microscopy (AFM), differential scanning calorimetry, water contact angle, and small-angle X-ray scattering analyses...
August 7, 2018: ACS Applied Materials & Interfaces
Matthew J Harrington, Franziska Jehle, Tobias Priemel
Biotechnology offers an exciting avenue towards the sustainable production of high performance proteinaceous polymeric materials. In particular, the mussel byssus - a high performance adhesive bio-fiber used by mussels to cling on hard surfaces - has become a veritable archetype for bio-inspired self-healing fibers, tough coatings and versatile wet adhesives. However, successful translation of mussel-inspired design principles into man-made materials hinges upon elucidating structure-function relationships and biological fabrication processes...
August 4, 2018: Biotechnology Journal
Bitao Lu, Fei Lu, Luoxiao Ran, Kun Yu, Yang Xiao, Zhiquan Li, Fangying Dai, Dayang Wu, Guangqian Lan
Developing highly active and green antibacterial agents for pathogens, especially multidrug-resistant superbugs, is vital for solving the problem of serious antibiotic resistance. Herein, we report a unique system of gold nanoparticles coated with chicken egg white (CEW) and 2-mercapto-1-methylimidazole (MMT) as a novel antibacterial agent. The CEW was used to prepare the gold nanoparticles as a commercially available reducing and stabilizing agent, and then the MMT self-assembled on the surface of nanoparticles...
July 27, 2018: International Journal of Biological Macromolecules
Xiaohan Wang, Yixuan Li, Yuhai Qian, Hong Qi, Jian Li, Junqi Sun
Polymeric materials used in spacecraft require to be protected with an atomic oxygen (AO)-resistant layer because AO can degrade these polymers when spacecraft serves in low earth orbit (LEO) environment. However, mechanical damage on AO-resistant coatings can expose the underlying polymers to AO erosion, shortening their service life. In this study, the fabrication of durable AO-resistant coatings that are capable of autonomously healing mechanical damage under LEO environment is presented. The self-healing AO-resistant coatings are comprised of 2-ureido-4[1H]-pyrimidinone (UPy)-functionalized polyhedral oligomeric silsesquioxane (POSS) (denoted as UPy-POSS) that forms hydrogen-bonded three-dimensional supramolecular polymers...
July 18, 2018: Advanced Materials
Meijin Liu, Peng Liu, Gang Lu, Zhengtao Xu, Xi Yao
Healable silicone materials have great technical impact in coatings, smart actuators, and flexible electronics, however, current healable silicone materials lack mechanical tunability. Herein, we designed and synthesized a new type of healable silicone through hydrogen-bond assisted multiphase assembly of siloxane oligomers. Besides the enhanced mechanical strength, unique water-enhanced healing was observed in the polymer network which is due to the reversible dissociation/association of multivalent hydrogen bonds in the presence of water...
July 11, 2018: Angewandte Chemie
Feiya Fu, Meiqi Huang, Weilan Zhang, Yang Zhao, Xiangdong Liu
A self-healing polybenzoxazine is synthesized solely based on dynamic ester bonds. For this purpose, an anhydride (succinic anhydride) was added into bisphenol F derived benzoxazine monomer before thermocuring. Owing to the transesterification of newly formed ester bonds, the thermoset network behaves as a thermoplastic at 140 °C in the presence of Zn (Ac)2 , and shows self-healing properties even after multiple damage-healing cycles. Furthermore, kinetics study indicates that the transesterification is a first-order reaction and the activation energy is about 135...
July 9, 2018: Scientific Reports
Dimple Chouhan, Naresh Thatikonda, Linnea Nilebäck, Mona Widhe, My Hedhammar, Biman B Mandal
Silk is considered to be a potential biomaterial for a wide number of biomedical applications. Silk fibroin (SF) can be retrieved in sufficient quantities from the cocoons produced by silkworms. While it is easy to formulate into scaffolds with favorable mechanical properties, the natural SF does not contain bioactive functions. Spider silk proteins, on the contrary, can be produced in fusion with bioactive protein domains, but the recombinant procedures are expensive, and large-scale production is challenging...
July 18, 2018: ACS Applied Materials & Interfaces
Yao Huang, Leping Deng, Pengfei Ju, Luyao Huang, Hongchang Qian, Dawei Zhang, Xiaogang Li, Herman A Terryn, Johannes M C Mol
In this study, a new self-healing shape memory polymer (SMP) coating was prepared to protect the aluminum alloy 2024-T3 from corrosion by the incorporation of dual-function microspheres containing polycaprolactone and the corrosion inhibitor 8-hydroxyquinoline (8HQ). The self-healing properties of the coatings were investigated via scanning electron microscopy, electrochemical impedance spectroscopy, and scanning electrochemical microscopy following the application of different healing conditions. The results demonstrated that the coating possessed a triple-action self-healing ability enabled by the cooperation of the 8HQ inhibitor, the SMP coating matrix, and the melted microspheres...
July 11, 2018: ACS Applied Materials & Interfaces
Chiaki Nakamura, Kengo Manabe, Mizuki Tenjimbayashi, Yuki Tokura, Kyu-Hong Kyung, Seimei Shiratori
Bioinspired photonic crystals that can be used to precisely control the optical reflection of light of a specific wavelength by varying their thickness and refractive index have attracted much attention. Among them, photonic crystals that can reflect near-infrared light have attracted attention owing to their potential applications including window coating with heat-shielding property. However, photonic crystals with an optical function in practical use sometimes lose their function because of contamination...
July 5, 2018: ACS Applied Materials & Interfaces
Wuli Pu, Daihua Fu, Zhanhua Wang, Xinpeng Gan, Xili Lu, Li Yang, Hesheng Xia
Combining self-healing functions with damage diagnosing, which can achieve timely healing autonomously, is expected to improve the reliability and reduce life cycle cost of materials. Here, a flexible conductive composite composed of a dynamically crosslinked polyurethane bearing Diels-Alder bonds (PUDA) and carbon nanotubes (CNTs), which possess both crack diagnosing and self-healing functions, is reported. The introduced dynamic Diels-Alder bonds endow the materials self-healing function and the powder-based preparation route based on the specially designed CNTs-coated PUDA micropowders leads to the formation of segregated CNTs network, which makes the composite possess excellent mechanical properties and high conductivity...
May 2018: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Xin Jing, Hao-Yang Mi, Yu-Jyun Lin, Eduardo Enriquez, Xiang-Fang Peng, Lih-Sheng Turng
Integrating multifunctionality such as adhesiveness, stretchability, and self-healing ability on a single hydrogel has been a challenge and is a highly desired development for various applications including electronic skin, wound dressings, and wearable devices. In this study, a novel hydrogel was synthesized by incorporating polydopamine-coated talc (PDA-talc) nanoflakes into a polyacrylamide (PAM) hydrogel inspired by the natural mussel adhesive mechanism. Dopamine molecules were intercalated into talc and oxidized, which enhanced the dispersion of talc and preserved catechol groups in the hydrogel...
June 20, 2018: ACS Applied Materials & Interfaces
Ludmila B Boinovich, Kirill A Emelyanenko, Alexander G Domantovsky, Alexandre M Emelyanenko
A strategy, combining laser chemical modification with laser texturing, followed by chemisorption of the fluorinated hydrophobic agent was used to fabricate the series of superhydrophobic coatings on an aluminum alloy with varied chemical compositions and parameters of texture. It was shown that high content of aluminum oxynitride and aluminum oxide formed in the surface layer upon laser treatment allows solving the problem of enhancement of superhydrophobic coating resistance to abrasive loads. Besides, the multimodal structure of highly porous surface layer leads to self-healing ability of fabricated coatings...
June 19, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Zhiwei Huang, Robert S Gurney, Tao Wang, Dan Liu
Superhydrophobic (SH) surfaces with self-cleaning photocatalytic properties have become an important research focus in recent years. In this work, we fabricated multifunctional and environmentally durable SH surfaces via a facile one-step reaction of octadecyl isocyanate (ODI) with TiO2 particles. The resulting films possess SH properties, facilitated by a combination of hydrophobic long alkyl chains and the hierarchical crystalline structure. Films can be prepared via spray or blade coating on a variety of hard and soft substrates, and function well when exposed to either air or oil...
October 1, 2018: Journal of Colloid and Interface Science
Tingting Cai, Shuangjun Huo, Tao Wang, Weixiang Sun, Zhen Tong
A new supramolecular hydrogel with superior self-healing and shape memory properties was synthesized via in-situ copolymerization of the adamantane-containing monomer N-adamantylacrylamide (Ad-AAm) and monomer acrylic acid (AAc) in the polycyclodextrin (PCD) aqueous solution, where PCD served as the polyfunctional physical cross-linker. The PCD-Ad hydrogels showed strength of 40 kPa with breaking strain of 600%, but small tensile loading-unloading hysteresis and residual deformation benefited from the reversible crosslinking structure...
August 1, 2018: Carbohydrate Polymers
Yanbin Zhao, Liqian Shi, Xiaojing Ji, Jichen Li, Zhuangzhuang Han, Shuoqi Li, Rongchang Zeng, Fen Zhang, Zhenlin Wang
Magnesium (Mg) alloys have shown great potential in biomedical materials due to their biocompatibility and biodegradability. However, rapid corrosion rate, which is an inevitable obstacle, hinders their clinical applications. Besides, it is necessary to endow Mg alloys with antibacterial properties, which are crucial for temporary implants. In this study, silver nanoparticles (AgNPs) and polymethyltrimethoxysilane (PMTMS) were introduced into AZ31 Mg alloys via layer-by-layer (LbL) assembly and siloxane self-condensation reaction...
September 15, 2018: Journal of Colloid and Interface Science
Benan Shu, Shaopeng Wu, Lijie Dong, Qing Wang, Quantao Liu
This work aims to develop an original alginate micro-emulsion combining with droplets microfluidic method to produce multinuclear Ca-alginate microcapsules containing rejuvenator for the self-healing of bituminous binder. The sizes of the Ca-alginate microcapsules could be easily controlled by tuning flow rates of the continuous and dispersed phases. The addition of a surfactant Tween80 not only improved the stability of the emulsion, but it also effectively reduced the size of the microcapsules. Size predictive mathematical model of the microcapsules was proposed through the analysis of fluid force...
April 19, 2018: Materials
Joseph C Cremaldi, Bharat Bhushan
Healing is an intrinsic ability in the incredibly biodiverse populations of the plant and animal kingdoms created through evolution. Plants and animals approach healing in similar ways but with unique pathways, such as damage containment in plants or clotting in animals. After analyzing the examples of healing and defense mechanisms found in living nature, eight prevalent mechanisms were identified: reversible muscle control, clotting, cellular response, layering, protective surfaces, vascular networks or capsules, exposure, and replenishable functional coatings...
2018: Beilstein Journal of Nanotechnology
Sriharitha Rowthu, Patrik Hoffmann
Conventional omniphobic surfaces suffer from wear-sensitivity due to soft apolar coatings or substrates and protruding surface features that are eroded even for mild abrasion treatments, leading to the loss of dewetting properties after wear. Evidently, there was a trade-off between dewetting and tribological properties. Here, we show the establishment of self-healing slippery properties post severe abrasion by utilizing perfluoropolyether-impregnated mesoporous Al2 O3 (MPA) composites. The hard polar alumina matrix provides the optimal tribological properties, and the liquid lubricant in the porous network contributes to both tribological and self-healing dewetting properties...
March 28, 2018: ACS Applied Materials & Interfaces
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