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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
Tao Liu, Zhangwei Guo, Zhenshun Zeng, Na Guo, Yanhua Lei, Tong Liu, Shibin Sun, Xueting Chang, Yansheng Yin, Xiaoxue Wang
Steel corrosion is a global problem in marine engineering. Numerous inhibitory treatments have been applied to mitigate the degradation of metallic materials; however, they typically have a high cost and are not environmental-friendly. Here we present a novel and "green" approach for the protection of steel by a marine bacterium Pseudoalteromonas lipolytica. This approach protects steel from corrosion in seawater via the formation of a biofilm followed by the formation of an organic-inorganic hybrid film...
October 18, 2018: ACS Applied Materials & Interfaces
Yi Liu, Shan-Hui Hsu
Hydrogels, which are crosslinked polymer networks with high water contents and rheological solid-like properties, are attractive materials for biomedical applications. Self-healing hydrogels are particularly interesting because of their abilities to repair the structural damages and recover the original functions, similar to the healing of organism tissues. In addition, self-healing hydrogels with shear-thinning properties can be potentially used as the vehicles for drug/cell delivery or the bioinks for 3D printing by reversible sol-gel transitions...
2018: Frontiers in Chemistry
Ziguang Zhao, Shuyun Zhuo, Ruochen Fang, Longhao Zhang, Xintao Zhou, Yichao Xu, Jianqi Zhang, Zhichao Dong, Lei Jiang, Mingjie Liu
Programmable materials that can change their inherent shapes or properties are highly desirable due to their promising applications. However, among various programmable shape-morphing materials, the single control route allows temporary states to recover the unchangeable former state, thus lacking the sophisticated programmability for their shape-encoding behaviors and mechanics. Herein, dual-programmable shape-morphing organohydrogels featuring supramolecular heteronetworks are developed. In the system, the metallo-supramolecular hydrogel framework and micro-organogels featuring semicrystalline comb-type networks independently respond to different stimuli, thereby providing orthogonal dual-switching mechanics and ultrahigh mechanical strength...
October 17, 2018: Advanced Materials
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
Tawfik Al-Hadhrami, Faisal Saeed, Funminiyi Olajide
Wireless Mesh Networks (WMNs) integrate the advantages of WLANs and mobile Ad Hoc networks, which have become the key techniques of next-generation wireless networks in the context of emergency recovery. Wireless Mesh Networks (WMNs) are multi-hop wireless networks with instant deployment, self-healing, self-organization and self-configuration features. These capabilities make WMNs a promising technology for incident and emergency communication. An incident area network (IAN) needs a reliable and lively routing path during disaster recovery and emergency response operations when infrastructure-based communications and power resources have been destroyed and no routes are available...
2018: PloS One
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
Hongmei Chen, Yonghua Bi, Siyeong Ju, Linxia Gu, Xiaoyan Zhu, Xinwei Han
Hemodynamics may play an essential role in the initiation and progression of abdominal aortic aneurysm (AAA). We aimed to study the mechanism of self-healing process by the changes of hemodynamics and pathology in an enlarging AAA in rabbits. Seventy-two rabbits were randomly divided into three groups. Rabbits underwent extrinsic coarctation and received a 10-minute elastase incubation in Group A and Group B. Absorbable suture used in Group A was terminated by balloon dilation at week 4. Diameter was measured after 1, 3, 5, and 15 weeks, computational fluid dynamics analysis was performed at week 3 and week 15...
2018: PloS One
Chen Wang, Michael Fadeev, Junji Zhang, Margarita Vázquez-González, Gilad Davidson-Rozenfeld, He Tian, Itamar Willner
Photoresponsive nucleic acid-based carboxymethyl cellulose (CMC) hydrogels are synthesized, and their application as shape-memory and self-healing functional matrices are discussed. One system involves the preparation of a carboxymethyl cellulose hydrogel crosslinked by self-complementary nucleic acid duplexes and by photoresponsive trans -azobenzene/β-cyclodextrin (β-CD) supramolecular complexes. Photoisomerization of the trans -azobenzene to the cis -azobenzene results in a hydrogel exhibiting lower stiffness due to the separation of the azobenzene/β-CD bridging units...
September 21, 2018: Chemical Science
Marek W Urban, Dmitriy Davydovich, Ying Yang, Tugba Demir, Yunzhi Zhang, Leah Casabianca
Self-healing materials are notable for their ability to recover from physical or chemical damage. We report that commodity copolymers, such as poly(methyl methacrylate)/n-butyl acrylate [p(MMA/nBA)] and their derivatives, can self-heal upon mechanical damage. This behavior occurs in a narrow compositional range for copolymer topologies that are preferentially alternating with a random component (alternating/random) and is attributed to favorable interchain van der Waals forces forming key-and-lock interchain junctions...
October 12, 2018: Science
Brent S Sumerlin
No abstract text is available yet for this article.
October 12, 2018: Science
Shengping Dai, Xiaoshuang Zhou, Shuai Wang, Jianning Ding, Ningyi Yuan
Self-healing conductive elastomers have emerged as a class of novel materials that are important for fabricating human-motion sensors, soft robots and healthcare monitoring systems. Herein, we report on a hydrogel of modified poly(γ-glutamic) acid polymer chains crosslinked by coordination complexes, which exhibits good stretchability (1375%), long-term stability (more than 40 days), and self-healing ability (99.0 ± 1.5% in 3 h). Furthermore, a "sandwich" structure composite was fabricated, which is composed of self-healing hydrogels and Au nanograin-decorated aligned multiwall carbon nanotube sheets...
October 11, 2018: Nanoscale
Igor Levchenko, Kateryna Bazaka, Thierry Belmonte, Michael Keidar, Shuyan Xu
Spacecraft are expected to traverse enormous distances over long periods of time without an opportunity for maintenance, re-fueling, or repair, and, for interplanetary probes, no on-board crew to actively control the spacecraft configuration or flight path. Nevertheless, space technology has reached the stage when mining of space resources, space travel, and even colonization of other celestial bodies such as Mars and the Moon are being seriously considered. These ambitious aims call for spacecraft capable of self-controlled, self-adapting, and self-healing behavior...
October 9, 2018: Advanced Materials
Xueli Zhi, Chunxiong Zheng, Jie Xiong, Jianyao Li, Chenxi Zhao, Linqi Shi, Zhenkun Zhang
With expanding applications of hydrogels in diverse fields ranging from biomaterials to sensors, actuators and soft robotics, there are urgent needs to endow one single gel with multiple physicochemical properties such as stimuli-responsiveness, injectability, self-healing and tunable internal structures. However, it is challenging to simultaneously incorporate these highly sought-after properties into one single gel. Herein, a conceptual hydrogel system with all of these properties is presented via combining bioconjugate chemistry, filamentous viruses and dynamic covalent bonds...
October 9, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Yi Deng, Min Huang, Dan Sun, Yi Hou, Yubao Li, Taosheng Dong, Xiaohong Wang, Li Zhang, Weizhong Yang
Chemically linked double network (DN) hydrogels display extraordinary mechanical attributes but mostly suffer from poor self-healing property and unsatisfactory biocompatibility due to the irreversible breaks in their chemical-linked networks and the use of toxic chemical cross-linking agents. To address these limitations, we developed a novel κ-carrageenan/polyacrylamide (KC/PAM) DN hydrogel through a dual physical-cross-linking strategy, with the ductile, hydrophobically associated PAM being the first network, and the rigid potassium ion (K+ ) cross-linked KC being the second network...
October 18, 2018: ACS Applied Materials & Interfaces
Ji Hyun Ryu, Gyeong Jin Lee, Yu-Ru V Shih, Tae-Il Kim, Shyni Varghese
BACKGROUND: Phenylboronic acid-polymers (PBA-polymers) have attracted tremendous attention as potential stimuli-responsive materials with applications in drug-delivery depots, scaffolds for tissue engineering, HIV barriers, and biomolecule-detecting/sensing platforms. The unique aspect for PBA-polymers is their interactions with diols, which results in reversible, covalent bond formations. This very nature of reversible bonding between boronic acids and diols has been fundamental to their applications in the biomedical area...
October 8, 2018: Current Medicinal Chemistry
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...
October 8, 2018: Advanced Materials
Long Fei Fan, Min Zhi Rong, Ming Qiu Zhang, Xudong Chen
To enable repeated intrinsic self-healing of wider crack in polymers, a proof-of-concept approach is verified in the present work. It operates through two-way shape memory effect (SME) aided intrinsic self-healing. Accordingly, reversible C-ON bond is introduced to the main chain of crosslinked polyurethane (PU) containing elastomeric dispersed phase (styrene-butadiene-styrene block copolymer, SBS). The PU/SBS blend was developed by the authors recently, and proved to possess external stress-free two-way SME after programming...
October 4, 2018: ACS Applied Materials & Interfaces
Thomas Elschner, Franziska Obst, Thomas Heinze
In context with facile and efficient syntheses of functional polymeric materials, the combination of polysaccharides and functional moieties based on renewable resources is a sustainable and valuable approach. This review presents alternatives to prominent click reactions utilizing biopolymer derivatives with furfuryl and maleimide groups. On the one hand, the cross-linking by Diels-Alder reaction of these polymers enables the synthesis of novel materials in the fields of self-healing polymers, tissue engineering, and drug delivery...
October 1, 2018: Macromolecular Bioscience
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
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