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Gaolai Du, Anran Mao, Jinhong Yu, Jingjing Hou, Nifang Zhao, Jingkai Han, Qian Zhao, Weiwei Gao, Tao Xie, Hao Bai
Replicating nacre's multiscale architecture represents a promising approach to design artificial materials with outstanding rigidity and toughness. It is highly desirable yet challenging to incorporate self-healing and shape-programming capabilities into nacre-mimetic composites due to their rigidity and high filler content. Here, we report such a composite obtained by infiltrating a thermally switchable Diels-Alder network polymer into a lamellar scaffold of alumina. The chemical bond switchability and the physical confinement by the filler endows the composite with sufficient molecular mobility without compromising its thermal dimension stability...
February 18, 2019: Nature Communications
Zhilu Rao, Shumin Liu, Ruiyue Wu, Guanglin Wang, Zhixiang Sun, Liangjiu Bai, Wenxiang Wang, Hou Chen, Huawei Yang, Donglei Wei, Yuzhong Niu
In this manuscript, dual network self-healing alginate/guar gum hydrogels with polydopamine-type microcapsules from mesoporous silica nanoparticles were facilely prepared through one-pot method. Glutaraldehyde (GA) was used as a crosslinking agent to crosslink guar gum and sodium alginate, respectively. Metal-ligand interactions as reversible non-covalent bond make the dual network hydrogels have a high degree of self-healing ability, which FeCl3 ·6H2 O was coordinated with sodium alginate and polydopamine on the surface of microcapsules, respectively...
February 15, 2019: International Journal of Biological Macromolecules
Xiyuan Mao, Ruoyu Cheng, Hongbo Zhang, Jinhong Bae, Liying Cheng, Lu Zhang, Lianfu Deng, Wenguo Cui, Yuguang Zhang, Hélder A Santos, Xiaoming Sun
The fabrication of highly biocompatible hydrogels with multiple unique healing abilities for the whole healing process, for example, multifunctional hydrogels with injectable, degradation, antibacterial, antihypoxic, and wound healing-promoting properties that match the dynamic healing process of skin flap regeneration, is currently a research challenge. Here, a multifunctional and dynamic coordinative polyethylene glycol (PEG) hydrogel with mangiferin liposomes (MF-Lip@PEG) is developed for clinical applications through Ag-S coordination of four-arm-PEG-SH and Ag+ ...
February 6, 2019: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Xiying Li, Jia Ming Zhang, Xin Yi, Zhongyi Huang, Pengyu Lv, Huiling Duan
3D printing with a high degree of spatial and compositional precision could open new avenues to the design and fabrication of functional composites. By combining the direct ink writing and microfluidics, a multimaterial 3D printing system for fabricating textured composites with liquid inclusions of programmable spatial distribution and compositions is reported here. Phase diagrams for the rational selection of desired printing parameters are determined through a combination of simple theoretical analysis and experimental studies...
February 6, 2019: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
Xia Liu, Junji Zhang, Michael Fadeev, Ziyuan Li, Verena Wulf, He Tian, Itamar Willner
A new class of stimuli-responsive DNA-based polyacrylamide hydrogels is described. They consist of glucosamine-boronate ester-crosslinked polyacrylamide chains being cooperatively bridged by stimuli-responsive nucleic acids. The triggered closure and dissociation of the stimuli-responsive units lead to switchable stiffness properties of the hydrogel. One hydrogel includes glucosamine-boronate esters and K+ -ion-stabilized G-quadruplex units as cooperative crosslinkers. The hydrogel bridged by the two motifs reveals high stiffness, whereas the separation of the G-quadruplex bridges by 18-crown-6-ether yields a low stiffness hydrogel...
January 28, 2019: Chemical Science
Abdallah Daddi-Moussa-Ider, Segun Goh, Benno Liebchen, Christian Hoell, Arnold J T M Mathijssen, Francisca Guzmán-Lastra, Christian Scholz, Andreas M Menzel, Hartmut Löwen
The interaction between nano- or micro-sized particles and cell membranes is of crucial importance in many biological and biomedical applications such as drug and gene delivery to cells and tissues. During their cellular uptake, the particles can pass through cell membranes via passive endocytosis or by active penetration to reach a target cellular compartment or organelle. In this manuscript, we develop a simple model to describe the interaction of a self-driven spherical particle (moving through an effective constant active force) with a minimal membrane system, allowing for both penetration and trapping...
February 14, 2019: Journal of Chemical Physics
Jingyu Tan, Ruowei Yu, Limin Xiao
We present a novel and efficient approach to generating Bessel-like beams through fabricating self-growing polymer microtips at the facet of single-mode fibers. To produce these beams, the length and shape of microtips were precisely optimized. Specifically, the convex droplet height and its photopolymerization parameters feature prominently in Bessel-like beams via microtips. A wide conversion bandwidth of the microtips and self-healing properties of the produced Bessel-like beam were also investigated in detail...
February 15, 2019: Optics Letters
Rakenth R Menon, Jing Luo, Xiaobo Chen, Hui Zhou, Zhiyong Liu, Guangwen Zhou, Ning Zhang, Congrui Jin
Concrete is susceptible to cracking owing to drying shrinkage, freeze-thaw cycles, delayed ettringite formation, reinforcement corrosion, creep and fatigue, etc. Continuous inspection and maintenance of concrete infrastructure require onerous labor and high costs. If the damaging cracks can heal by themselves without any human interference or intervention, that could be of great attraction. In this study, a novel self-healing approach is investigated, in which fungi are applied to heal cracks in concrete by promoting calcium carbonate precipitation...
February 14, 2019: Scientific Reports
Shengmei Zhao, Wenhao Zhang, Le Wang, Wei Li, Longyan Gong, Weiwen Cheng, Hanwu Chen, Jozef Gruska
In this paper, we report on experimental demonstration of the propagation and self-healing property of Bessel-Gaussian (BG) beam carrying orbital angular momentum (OAM) in an underwater environment. Especially, the effects of topological charge, temperature gradient, and salinity on the transmission and self-reconstruction of BG beam in underwater turbulence are analyzed. The results show that the detection probabilities both for propagation and self-healing greatly decrease with temperature gradient, and gradually decrease with salinity...
February 14, 2019: Scientific Reports
Huaxiu Xu, Yun Tan, Wenhui Rao, Di Wang, Shimei Xu, Wang Liao, Yu-Zhong Wang
Hydrogels are known as soft and wet materials. Development of metal-like hydrogels with super strong and malleable properties is highly desirable as it allows for broader application and reprocessability. Here we report a dual nanocomposite hydrogel with peculiar mechanical properties in water-poor region. The gel with water content of 35% exhibits excellent recovery and fatigue resistance with elongation at break exceeding 800%, while the gel with 15 wt% of water content shows an ultra-high compressive strength and modulus of more than 1 GPa...
February 6, 2019: Journal of Colloid and Interface Science
Jin Wu, Zixuan Wu, Xing Lu, Songjia Han, Bo-Ru Yang, Xuchun Gui, Kai Tao, Jianmin Miao, Chuan Liu
Ionic hydrogels, a class of intrinsically stretchable and conductive materials, are widely used in soft electronics. However, the easy freezing and drying of water-based hydrogels significantly limit their long-term stability. Here, a facile solvent-replacement strategy is developed to fabricate ethylene glycol (Eg)/glycerol (Gl)-water binary anti-freezing and anti-drying organohydrogels for ultrastretchable and sensitive strain sensing within a wide temperature range. Due to the ready formation of strong hydrogen bonds between Eg/Gl and water molecules, the organohydrogels gain exceptional freezing and drying tolerance with retained deformability, conductivity and self-healing ability even stay at extreme temperature for a long time...
February 14, 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
Ruiwen Niu, Mingliang Jin, Jieping Cao, Zhibin Yan, Jinwei Gao, Hao Wu, Guofu Zhou, Lingling Shui
Self-healing flexible conductive films have been fabricated, evaluated, and applied. The film is composed of a fragile indium tin oxide (ITO) layer covered with sprayed liquid metal (LM) droplets. Self-healing of electrical conductivity is achieved via spontaneous capillary wicking of LM droplets into cracks/defects of the ITO film. The liquid metal adhering onto the ITO layer can also connect the ITO fragments during bending to keep the overall conductivity of the composite LM/ITO film stable. Stable and reversible electrowetting performance has been achieved with the composite LM/ITO as the conductive film, in either flat or curved states...
February 11, 2019: Micromachines
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
Denis Gebauer, Stephan E Wolf
"Non-classical" notions consider formation pathways of crystalline materials where larger species than monomeric chemical constituents, i.e., ions or single molecules, play crucial roles, which are not covered by the classical theories dating back to the 1870s and 1920s. Providing an outline of "non-classical" nucleation, we demonstrate that pre-nucleation clusters (PNCs) can lie on alternative pathways to phase separation, where the very event of demixing is not primarily based on the sizes of the species forming, as in the classical view, but their dynamics...
February 12, 2019: Journal of the American Chemical Society
Nicholas B Tito, Costantino Creton, Cornelis Storm, Wouter G Ellenbroek
Reversible crosslinking is a design paradigm for polymeric materials, wherein they are microscopically reinforced with chemical species that form transient crosslinks between the polymer chains. Besides the potential for self-healing, recent experimental work suggests that freely diffusing reversible crosslinks in polymer networks, such as gels, can enhance the toughness of the material without substantial change in elasticity. This presents the opportunity for making highly elastic materials that can be strained to a large extent before rupturing...
February 12, 2019: Soft Matter
Chunyang Bao, Zhiwei Guo, Haoxiang Sun, Junqi Sun
The fabrication of mechanically robust polymeric materials capable of self-healing and recycling remains challenging because the mobility of polymer chains in such polymers is very limited. In this work, mechanically robust supramolecular thermosets capable of healing physical damages and recycling under mild conditions are fabricated by trimerization of bi-(ortho-aminomethyl-phenylboronic acid)- and tri-(ortho-aminomethyl-phenylboronic acid)-terminated poly(propylene glycol) oligomers (denoted as Bi-PBA-PPG and Tri-PBA-PPG, respectively)...
February 11, 2019: ACS Applied Materials & Interfaces
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
Tianqi Li, Yang Li, Xiaohan Wang, Xiang Li, Junqi Sun
The fabrication of shape memory polymers that are mechanically robust, capable of being induced by near-infrared (NIR) light and healing mechanical damage and the fatigued shape memory function remains a challenge. In this study, thermally and NIR-light-induced shape memory polymers with self-healing ability and satisfactory mechanical robustness are fabricated by dispersing poly(acrylic acid) (PAA)-grafted graphene oxide (GO) (PAA-GO) into polyvinyl alcohol (PVA) matrix. The PVA/PAA-GO3% films with a PAA-GO content of 3...
February 8, 2019: ACS Applied Materials & Interfaces
Fan Nan, Zijie Yan
Metamolecules and crystals consisting of nanoscale building blocks offer rich models to study colloidal chemistry, materials science and soft matter. Here we demonstrate the self-assembly of colloidal Ag nanoparticles into quasi-one-dimensional metamolecules with intriguing self-healing ability in a linearly polarized optical field. By investigating the spatial stability of the metamolecules, we find that the origin of self-healing is the inhomogeneous interparticle electrodynamic interactions enhanced by the formation of unusual nanoparticle dimers, which minimize the free energy of the whole structures...
February 7, 2019: Angewandte Chemie
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