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self-healing coating

Seon-Yeong Kwak, Juan Pablo Giraldo, Tedrick Thomas Salim Lew, Min Hao Wong, Pingwei Liu, Yun Jung Yang, Volodymyr B Koman, Melissa K McGee, Bradley D Olsen, Michael S Strano
Plants accumulate solid carbon mass and self-repair using atmospheric CO2 fixation from photosynthesis. Synthetic materials capable of mimicking this property can significantly reduce the energy needed to transport and repair construction materials. Here, a gel matrix containing aminopropyl methacrylamide (APMA), glucose oxidase (GOx), and nanoceria-stabilized extracted chloroplasts that is able to grow, strengthen, and self-repair using carbon fixation is demonstrated. Glucose produced from the embedded chloroplasts is converted to gluconolactone (GL) via GOx, polymerizing with APMA to form a continuously expanding and strengthening polymethacrylamide...
November 2018: Advanced Materials
Yabin Li, Bucheng Li, Xia Zhao, Ning Tian, Junping Zhang
Bioinspired superhydrophobic coatings are of great interest in academic and industrial areas. However, their real-world applications are hindered by some main bottlenecks, especially the pollutive preparation methods (e.g., organic solvents and fluorinated compounds) and poor mechanical stability. Here, we report for the first time the totally waterborne, nonfluorinated, mechanically robust, and self-healing superhydrophobic coatings. The coatings were fabricated by spray-coating polyurethane (PU) aqueous solution and a hexadecyl polysiloxane-modified SiO2 (SiO2 @HD-POS) aqueous suspension onto substrates using PU as the adhesive...
November 14, 2018: ACS Applied Materials & Interfaces
Ali H Tayeb, Ezatollah Amini, Shokoofeh Ghasemi, Mehdi Tajvidi
Cellulose nanomaterials (CNs) are of increasing interest due to their appealing inherent properties such as bio-degradability, high surface area, light weight, chirality and the ability to form effective hydrogen bonds across the cellulose chains or within other polymeric matrices. Extending CN self-assembly into multiphase polymer structures has led to useful end-results in a wide spectrum of products and countless innovative applications, for example, as reinforcing agent, emulsion stabilizer, barrier membrane and binder...
October 18, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Xiankun Lin, Xiaodi Huang, Chenggen Zeng, Wei Wang, Chaogang Ding, Jie Xu, Qiang He, Bin Guo
Highly hydrophilic hydrogels are able to potentially act as fouling-resistant coatings to prevent the settlement of marine organisms, due to the inherent surface properties. It is highly desired to improve mechanical and antifouling (AF) performance of hydrogels for durable and effective usage. Herein, a kind of composite hydrogels with enhanced mechanical properties and synergetic AF activity is prepared in a simple and low-cost way. The cooperation of biocidal copper release and non-fouling interfaces is realized, resulting in improved AF performance...
October 9, 2018: Journal of Colloid and Interface Science
Wolong Liu, Jiupeng Zhang, Qi Liu, Jianzhong Pei, Cunzhen Zhu, Peng Liu
Micro-damages always occur and accumulate in asphalt pavement materials under the effects of temperature, vehicle loads and other factors during service. Accordingly, self-healing microcapsules could be added into asphalt binder and repair micro-damages to prevent damage extension in time. In this study, the emulsified rejuvenator and melamine-urea-formaldehyde resin (MUF) were selected as the core and cyst wall materials, respectively, and in-situ polymerization method was applied to synthesize the novel microcapsules...
January 1, 2019: Journal of Nanoscience and Nanotechnology
Youngsang Ko, Jeonghun Kim, Ho Young Jeong, Goomin Kwon, Dabum Kim, Minhee Ku, Jaemoon Yang, Yusuke Yamauchi, Hae-Yeong Kim, Chanhui Lee, Jungmok You
Recently, Near-infrared (NIR)-induced photothermal killing of pathogenic bacteria has received considerable attention due to the increase in antibiotic resistant bacteria. In this paper, we report a simple aqueous solution-based strategy to construct an effective photothermal nanocomposite composed of poly(3,4-ethylenedioxythiophene):poly(styrene-sulfonate) (PEDOT:PSS) and agarose with thermo-processability, light triggered self-healing, and excellent antibacterial activity. Our experiments revealed that PEDOT:PSS/agarose was easily coated on both a 2D glass substrate and 3D cotton structure...
January 1, 2019: Carbohydrate Polymers
Liyuan Zhang, Xinhui Xia, Yu Zhong, Dong Xie, Sufu Liu, Xiuli Wang, Jiangping Tu
The development of high-performance dendrite-free liquid-metal anodes at room temperature is of great importance for the advancement of alkali metal batteries. Herein an intriguing self-healing liquid dendrite-free Na-K alloy, fabricated by a facile room-temperature alloying process, aiming for application in potassium-ion batteries is reported. Through extensive investigation, its self-healing characteristics are rooted upon a thin solid K2 O layer (KOL) coated on the liquid Na-K alloy. The KOL not only acts as a protective layer to prevent the Na-K alloy from making contact with the electrolyte, but also greatly improves the wetting capability and adhesion between the liquid alloy and the carbon matrix (e...
November 2018: Advanced Materials
Sang Hyub Lee, Se-Ra Shin, Dai-Soo Lee
A self-healable polyhydroxyurethane (S-PU) was synthesized from sorbitol, a biomass of polyhydric alcohol, by a simple process that is suitable for practical applications. In the synthesis, only two primary hydroxyl groups of sorbitol were considered for the chain extension of the polyurethane (PU) prepolymers to introduce free hydroxyl groups in PU. As a control, conventional PU was synthesized by hexane diol mediated chain extension. Relative to the control, S-PU showed excellent intrinsic self-healing property via exchange reaction, which was facilitated by the nucleophilic addition of the secondary hydroxyl groups without any catalytic assistance and improved tensile strength due to the enhanced hydrogen bonding...
September 30, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
Chengbao Liu, Haichao Zhao, Peimin Hou, Bei Qian, Xiao Wang, Chunyan Guo, Liping Wang
Cyclodextrin, with a hydrophobic inner cavity and a hydrophilic exterior, is often used to encapsulate a widest range of guest molecules based on host-guest inclusion interactions. Graphene, an emerging nanobuilding material, exhibits great potential for numerous applications because of its superior characteristics. Herein, we synthesized a novel graphene/β-cyclodextrin-based supramolecular nanocontainer with excellent inhibitor encapsulating capacity and high impermeable properties. The benzotriazole (BTA)-loaded nanocontainers were then used to endow coating system with excellent passive and active anticorrosion performance...
October 24, 2018: ACS Applied Materials & Interfaces
Yusuf Çağatay Erşan, Kim Van Tittelboom, Nico Boon, Nele De Belie
Chemicals and synthetic coatings are widely used to protect steel against corrosion. Bio-based corrosion inhibition strategies can be an alternative in the arising bioeconomy era. To maintain the good state of steel reinforcement in cracked concrete, microbe-based self-healing cementitious composites (MSCC) have been developed. Yet, proposed strategies involve reasonably slow crack filling by biomineralization and thus risk the possible rebar corrosion during crack healing. Here we upgrade the rebar protection to a higher level by combining MSCC with microbial induced corrosion inhibition...
September 20, 2018: Scientific Reports
Ling-Yu Li, Lan-Yue Cui, Rong-Chang Zeng, Shuo-Qi Li, Xiao-Bo Chen, Yufeng Zheng, M Bobby Kannan
Magnesium (Mg) and its alloys have become a research frontier in biodegradable materials owing to their superior biocompatibility and excellent biomechanical compatibility. However, their high degradation rate in the physiological environment should be well tackled prior to clinical applications. This review summarizes the latest progress in the development of polymeric coatings on biodegradable Mg alloys over the last decade, regarding preparation strategies for polylactic acid (PLA), poly (latic-co-glycolic) acid (PLGA), polycaprolactone (PCL), polydopamine (PDA), chitosan (CS), collagen (Col) and their composite, and their performance in terms of corrosion resistance and biocompatibility...
August 25, 2018: Acta Biomaterialia
Bin Shang, Min Chen, Limin Wu
The biomimetic fabrication of Nepenthes as a new class of liquid-repellent surface materials has attracted much attention recently, but there still remains big challenges, for example, short-serving life, instability, and so forth. Herein, we develop a novel strategy to fabricate robust slippery liquid-repellent coating by the synthesis and use of silicon oil-contained ultraviolet-responsive microcapsules. Owing to the physical and chemical inertness of silicon oil and the substantial randomly dispersed microcapsules in the coating, this nepenthes-like liquid-repellent coating can not only endure different harsh environments but also have excellent long-term self-healing functions...
September 19, 2018: ACS Applied Materials & Interfaces
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...
September 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 15, 2018: ACS Applied Materials & Interfaces
Matthew J Harrington, Franziska Jehle, Tobias Priemel
Biotechnology offers an exciting avenue toward 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...
November 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...
August 27, 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
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