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self-healing coating

Bei Qian, Zhaoliang Zheng, Marios Michailidis, Nicole Fleck, Matthew Bilton, Yan Song, Guoliang Li, Dmitry G Shchukin
Mussel-inspired properties of dopamine have attracted immense scientific interest for surface modification of nanoparticles due to the high potential of dopamine functional groups to increase adhesion of nanoparticles to flat surfaces. Here, we report for the first time a novel type of inhibitor-loaded nanocontainers using polydopamine (PDA) as a pH-sensitive gatekeeper for mesoporous silica nanoparticles (MSNs). The encapsulated inhibitor (benzotriazole) was loaded into MSNs at neutral pH, demonstrating fast release in acidic environment...
February 20, 2019: ACS Applied Materials & Interfaces
Sudip Kumar Lahiri, Pengcheng Zhang, Cheng Zhang, Lin Liu
Limited robustness is a serious drawback for superhydrophobic coatings, and degrades the performance of superhydrophobic surfaces in practical applications. Although fluoro-reagents have excellent durability for superhydrophobicity, their use has been restricted due to various health and environmental concerns. In this work, we describe a facile and efficient fabrication strategy for creating robust fluorine-free superhydrophobic composite coatings that are prepared by a simple dip-dry method, in which the H3BO3-incorporated SiO2-alkyl-silane coatings are deposited on woven cotton fabric surfaces followed by polydimethylsiloxane (PDMS) modification...
February 14, 2019: ACS Applied Materials & Interfaces
Jiang Lu, Weihua Zhuang, Linhua Li, Bo Zhang, Li Yang, Dongping Liu, Hongchi Yu, Rifang Luo, Yunbing Wang
Tunable/sustained drug loading/releasing are of significance in addressing low cytotoxicity, long-term performance and localized mild healing response in biomedical applications. With an ingenious design, a self-healing sandwiched layer-by-layer (LBL) coating was constructed by using chitosan/heparin as the adopted polyelectrolytes with embedding of micelles, in which chitosan backbone was grafted with catechol and the micelle was modified with exposed phenylboronic acid, endowing the coating with enhanced stability by abundant interactions among each coating component (e...
February 12, 2019: ACS Applied Materials & Interfaces
Chuanjiang He, Tingting Ye, Wenqi Teng, Zhi Fang, Wei-Shuyi Ruan, Guowu Liu, Hui Chen, Jizeng Sun, Lanlan Hui, Feng Sheng, Dingyi Pan, Chunming Yang, Yi Steve Zheng, Meng-Bo Luo, Ke Yao, Ben Wang
Layer-by-layer (LbL) assembly is widely applied as a coating technique for nanoscale control of architecture and related properties. However, its translational applications are limited by the time-consuming and laborious nature of the process. Inspired by the blood clotting process, herein, we develop a shear flow-driven LbL (SF-LbL) self-assembly approach that accelerates the adsorption rate of macromolecules by mechanically configuring the polymer chain via a coil-stretch transition, which effectively simplifies and speeds the diffusion-controlled assembly process...
February 12, 2019: ACS Nano
Xue Wang, Linlin Chen, Guanqing Sun, Ren Liu
HYPOTHESIS: Hollow particles have been used in a variety of applications and many methods have been developed. Hollow particles templated from Pickering emulsions due to nanoparticle adsorption at the oil-water interface usually suffer from the collapsed morphologies and low thermal and solvent stability and enhancement of the shell can significantly improve the hollow particle performance. EXPERIMENTS: This paper reports hollow particles templated from Pickering emulsion droplets in combination with UV photopolymerization...
January 22, 2019: Journal of Colloid and Interface Science
Tuan Liu, Shuai Zhang, Cheng Hao, Christina Verdi, Wangcheng Liu, Hang Liu, Jinwen Zhang
Epoxy vitrimers prepared from anhydride-cured epoxies exhibit, repairable and reprocessable properties; however, they generally rely on a large amount of catalyst for accelerating the dynamic transesterification (DTER). If the catalyst loading is not enough, the vitrimer properties will be limited. In this work, a preparation method of catalyst-free epoxy vitrimer is demonstrated by adding glycerol to an epoxy-anhydride curing system. The hydroxyls of glycerol first react with the anhydride to induce the ring-opening of anhydride and form a carboxylic acid, and the latter attacks the epoxy and form a β-hydroxyester linkage, so the curing can be performed in the absence of catalyst...
February 5, 2019: Macromolecular Rapid Communications
Changyou Shao, Lei Meng, Meng Wang, Chen Cui, Bo Wang, Chun-Rui Han, Feng Xu, Jun Yang
Despite self-healing gels with structural resemblance to biological tissues attract great attention in biomedical field, it remains a dilemma for combination between fast self-healing properties and high mechanical toughness. Based on the design of dynamic reversible cross-links, we incorporate rigid tannic acid-coated cellulose nanocrystal (TA@CNC) motifs into the poly(vinyl alcohol) (PVA)-borax dynamic networks for the fabrication of a high toughness and rapidly self-healing nanocomposite (NC) hydrogel, together with dynamically adhesive and strain stiffening properties that are particularly indispensable for practical application in soft tissues substitutes...
January 17, 2019: ACS Applied Materials & Interfaces
Shumin Liu, Zhilu Rao, Ruiyue Wu, Zhixiang Sun, Zhiru Yuan, Liangjiu Bai, Wenxiang Wang, Huawei Yang, Hou Chen
Artificial development of smart materials from agricultural waste or food residues are particularly desirable for green chemistry. In this paper, dual network self-healing hydrogels were successfully fabricated by using functional microcapsule. This microcapsule was established by biomass porous carbon after recycling of apple residues. And glutaraldehyde (GA) as the healing agent was embedded in the porous carbon and the outer was coated with polydopamine (PDA). After adding the microcapsules, modifying guar gum-type hydrogels were successfully obtained with dual self-healing performance by combination of healing agent and metal-ligand coordination...
January 7, 2019: Journal of Agricultural and Food Chemistry
Ting Wang, Juan Du, Sheng Ye, LingHua Tan, JiaJun Fu
Novel Acid/Alkali/corrosion potential triple stimuli-responsive smart nanocontainers (TSR-SNs) were successfully assembled to regulate the release of encapsulated corrosion inhibitor, benzotriazole (BTA) by installing specially-structured bistable pseudorotaxanes as supramolecular nanovalves onto orifices of mesoporous silica nanoparticles. In normal condition, BTA molecules were sealed in the mesopores. Upon any stimulus of acid, alkali or corrosion potential, BTA molecules were quickly released due to the open states of supramolecular nanovalves...
January 4, 2019: ACS Applied Materials & Interfaces
Bo Li, Lei Kan, Shuai Zhang, Zhengdao Liu, Chao Li, Wei Li, Xinyue Zhang, Hao Wei, Ning Ma
Supramolecular polymers show unique and excellent properties due to the reversible and designable nature of the non-covalent interactions. Herein, ureido-pyrimidinone (UPy)-based supramolecular polymers were employed to fabricate the thermo-responsive composite materials with multi-walled carbon nanotubes (MWCNTs) by planting the MWCNTs onto the supramolecular polymer matrices via a simple surface spraying procedure. The MWCNTs coating on the surface of the supramolecular polymer matrices gave the composite film superhydrophobic and conductive properties, and it had a non-contact healable ability underwater under 808 nm near-infrared light (NIR) irradiation...
December 19, 2018: Nanoscale
Donghui Wang, Hongyu Liu, Jin-Long Yang, Shuxue Zhou
Creating an artificial surface, mimicking a live fish scale that repels oil underwater and with self-healing properties, would be significant for the development of nontoxic marine antifouling coatings. Here, we report a seawater-induced strategy to create in situ an underwater superoleophobic surface, starting from the coatings of a self-polishing polymer and seawater-responsive polymer-grafted SiO2 nanoparticles. The coatings' surfaces were able to renew in artificial seawater through the hydrolysis of the superficial self-polishing polymer and its subsequent dissolution...
December 18, 2018: ACS Applied Materials & Interfaces
Haiying Tan, Quanqian Lyu, Zhanjun Xie, Miaomiao Li, Kui Wang, Ke Wang, Bijin Xiong, Lianbin Zhang, Jintao Zhu
Photonic elastomers that can change colors like a chameleon have shown great promise in various applications. However, it still remains a challenge to produce artificial photonic elastomers with desired optical and mechanical properties. Here, the generation of metallosupramolecular polymer-based photonic elastomers with tunable mechanical strength, angle-independent structural color, and self-healing capability is reported. The photonic elastomers are prepared by incorporating isotropically arranged monodispersed SiO2 nanoparticles within a supramolecular elastomeric matrix based on metal coordination interaction between amino-terminated poly(dimethylsiloxane) and cerium trichloride...
December 13, 2018: Advanced Materials
Victoria Bustos-Terrones, Iris N Serratos, Rubicelia Vargas, Bruno C Landeros-Rivera, Yaneth A Bustos-Terrones, Ana M Soto Estrada, Jonathan O Vicente Escobar, Mario A Romero Romo, Jorge Uruchurtu, Carmina Menchaca, Juan M Esparza Schulz, Armando Domínguez
A SBA15-Fluconazole composite (SBA15-Flu) was prepared to formulate a self-healing coating for mild steel. The composite was obtained by dispersing SBA15 in a methanolic solution containing Fluconazole (Flu). The materials were characterized by using different techniques. Electrochemical impedance spectroscopy (EIS) was used for protective behavior evaluation of the coatings on mild steel substrates in an electrolytic solution prepared from sodium chloride and ammonium sulfate. The EIS results indicate that the inhibitor trapped in the SiO2 matrix is released when it comes into contact the aggressive solution, thus protecting the metal...
December 2018: ChemistryOpen
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
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