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Ya Wang, Rongzhan Fu, Zhiguang Duan, Xijuan Jiang, Chenhui Zhu, Daidi Fan
An elastomer-like phase (ELP) of phosphate salts with ultra-high stability was successfully prepared at the air-solid interface. ELPs possess multilayered structures, and exhibit high elasticity, and strong self-healing abilities. These unique properties of ELPs greatly expand our understanding of inorganic salts and reveal their potential application in future material fields.
August 17, 2018: Chemical Communications: Chem Comm
Yun-Yun Song, Yan Liu, Hao-Bo Jiang, Shu-Yi Li, Cigdem Kaya, Thomas Stegmaier, Zhi-Wu Han, Lu-Quan Ren
Inspired by the fog harvesting ability of the spider net and the interphase wetting surface of Namib desert beetles, we designed a kind of special bioinspired hybrid wetting surface on a Cu mesh by combining polydimethylsiloxane (PDMS) and graphene (G). A surface containing hydrophobic and superhydrophobic areas is prepared by a combination of laser etching and ultrasonic vibration. Thus, this as-prepared hybrid wetting surface can quickly drive tiny water droplets toward more wettable regions, which makes a great contribution to the improvement of collection efficiency...
August 17, 2018: Nanoscale
Angelo Buscaglia, Nicole Travaglio, Giacomo Tini, Gianpaolo Bezante, Manrico Balbi, Claudio Brunelli
BACKGROUND Spontaneous coronary artery dissection is the most common etiology of pregnancy-associated myocardial infarction. It is characterized by high rates of maternal morbidity and mortality and may cause fetal complications and death as well. CASE REPORT A 44-year-old female (G2P1) suffered from pregnancy-related spontaneous coronary artery dissection with dissection of distal left anterior descending coronary artery. The patient was hemodynamically stable and did not required revascularization, but signs of fetal distress were detected and thus an urgent cesarean delivery was performed...
August 15, 2018: American Journal of Case Reports
H Esat Kondakci, Ayman F Abouraddy
Space-time (ST) wave packets are diffraction-free, dispersion-free pulsed beams whose propagation invariance stems from correlations introduced into their spatio-temporal spectra. We demonstrate here experimentally and computationally that ST light sheets exhibit self-healing properties upon traversing obstacles in the form of opaque obstructions. The unscattered fraction of the wave packet retains the spatio-temporal correlations and, thus, propagation invariance is maintained. The scattered component does not satisfy the requisite correlation and thus, undergoes diffractive spreading...
August 15, 2018: Optics Letters
Xiachao Chen, Wei-Pin Huang, Ke-Feng Ren, Jian Ji
Spatially controlling the evolution of surface structures may provide an effective strategy for patterning surface roughness and facilitating the construction of various functional surfaces. In this study, we report a photocrosslinkable polymeric film with dynamic surface micro/nanostructures. The surface structures of the uncrosslinked regions can be eliminated under saturated humidity, which can be utilized to create patterned roughness on the film. One potential application of this patternable platform is as a "smart" label material for graphical symbols...
August 14, 2018: ACS Nano
Maria Akram, Ali Raza
Mobile robots in uncertain and unstructured environments frequently encounter faults. Therefore, an effective fault detection and recovery mechanism is required. One can possibly investigate natural systems to seek inspiration to develop systems that can handle such faults. Authors, in this pursuit, have explored the possibility of designing an artificial immune system, called Robot Immune System (RIS), to maintain a robot's internal health-equilibrium. This contrasts with existing approaches in which specific robotic tasks are performed instead of developing a self-healing robot...
August 10, 2018: Bio Systems
Jiuming Wan, Yue Xiao, Wei Song, Cheng Chen, Pan Pan, Dong Zhang
Ultra-thin wearing course (UTWC) has been developed in pavement preventive maintenance for many years. However, how to prolong the service life of UTWC still requires further research. This study introduced AC-5 and SMA-5 asphalt mixtures, which can be induction heated. Steel fiber and steel slag were used in the mixtures as additives. Marshall Stability and induction heating property of mixtures were characterized. In addition, self-healing property of UTWC materials had been emphatically conducted. Adding steel fiber in mixtures led to higher Marshall Stability and lower flow value, while steel slag generally showed a negative effect...
August 9, 2018: Materials
Ranjith Kumar Kankala, Feng-Jun Lu, Chen-Guang Liu, Shan-Shan Zhang, Ai-Zheng Chen, Shi-Bin Wang
In recent times, cartilage defects have been the most common athletic injuries, often leading to dreadful consequences such as osteoarthritis, pain, joint deformities, and other symptoms. It is also evident that damage to articular cartilage is often difficult to recover or self-heal because of poor vascular, nervous, and lymphatic supplies. Moreover, cartilage cells have poor regeneration ability and high maturity. Inspired by these facts and the rapid advances in the field of tissue engineering (TE), we fabricated highly porous three-dimensional (3D) scaffold architectures based on cell-responsive polymeric inks, i...
August 9, 2018: Materials
Panayiotis Bilalis, Dimitrios Skoulas, Anastasios Karatzas, John Marakis, Athanasios Stamogiannos, Chrisida Tsimblouli, Evangelia Sereti, Efstratios Stratikos, Konstantinos Dimas, Dimitris Vlassopoulos, Hermis Iatrou
A novel, multifunctional hydrogel that exhibits a unique set of properties for the effective treatment of pancreatic cancer (PC) is presented. The material is comprised of a pentablock terpolypeptide of the type PLys-b-(PHIS-co-PBLG)-PLys-b-(PHIS-co-PBLG)-b-PLys which is a non-cytotoxic polymer. It can be implanted via the least invasive route and selectively delivers gemcitabine to efficiently treat PC. Simply mixing the novel terpolypeptide with an aqueous solution of gemcitabine within a syringe results in the facile formation of a hydrogel that has the ability to become liquid under the shear rate of the plunger...
August 10, 2018: Biomacromolecules
Daham Jeong, Sang-Woo Joo, Vijay Vilas Shinde, Seunho Jung
A novel self-healing hydrogel was prepared from a cationic β-cyclodextrin oligomer allyl ether [C(βCD-OM)AE] using a triple cross-linking strategy combining electrostatic interaction, host-guest complexation, and CC bonds as the macrocrosslinker. Here, the C(βCD-OM)AE@Ad gel was successfully prepared by polymerization of synthesized C(βCD-OM)AE, 1-adamantyl acrylate, and acrylic acid. The triple cross-linked hydrogel shows multi-functionality of high mechanical strength, enhanced stability, cytocompatibility, pH responsiveness as well as self-healing ability...
October 15, 2018: Carbohydrate Polymers
Keval K Sonigara, Hiren K Machhi, Jayraj V Vaghasiya, Alain Gibaud, Swee Ching Tan, Saurabh S Soni
Quasi-solid-state dye-sensitized solar cells (DSSCs) fabricated with lightweight flexible substrates have a great potential in wearable electronic devices for in situ powering. However, the poor lifespan of these DSSCs limits their practical application. Strong mechanical stresses involved in practical applications cause breakage of the electrode/electrolyte interface in the DSSCs greatly affecting their performance and lifetime. Here, a mechanically robust, low-cost, long-lasting, and environment-friendly quasi-solid-state DSSC using a smart thermoreversible water-based polymer gel electrolyte with self-healing characteristics at a low temperature (below 0 °C) is demonstrated...
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
Yonglin He, Xiao-Qi Xu, Shanzhi Lv, Hongguang Liao, Yapei Wang
Owing to wide visual angle, low aberrations and great depth of focus, flexible optoelectronics have become one subject of intense investigations for rescue equipments and endoscopy tools. Ionic liquids are rising as a kind of fluidic "semiconductor" with advantages of high flexibility and self-healing ability. However, challenges in molecular design of photo-responsive ionic liquids impede the exploration of ionic liquids as intrinsic flexible liquid optoelectronics. This work demonstrated an imidazole-based ionic liquid covalently linked with polypyrrole oligomer by alkyl chains...
August 7, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Viktorija Glembockyte, Ralph Wieneke, Karl Gatterdam, Yasser Gidi, Robert Tampé, Gonzalo Cosa
The photostability of fluorescent labels comprises one of the main limitations in single-molecule fluorescence (SMF) and super-resolution imaging. An attractive strategy to increase the photostability of organic fluorophores relies on their coupling to photostabilizers, e.g. triplet excited state quenchers, render-ing self-healing dyes. Herein we report the self-healing proper-ties of trisNTA-Alexa647 fluorophores. Primarily designed to specifically label biomolecules containing an oligohistidine tag, we hypothesized that the increased effective concentration of Ni(II) triplet state quenchers would lead to their improved photostability...
August 7, 2018: Journal of the American Chemical Society
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
Benjamin B Rich, Boaz Pokroy
Plants are protected from the elements by a complex hierarchical epicuticular wax layer which has inspired the creation of super-hydrophobic and self-cleaning surfaces. Although many studies have been conducted on different plant wax systems to determine the mechanisms of water repulsion hardly any have studied the recovery of the epicuticular wax layer. In the current study the wetting properties and crystallographic nature of the wax surface of Brassica oleracea var. italica (broccoli) has been studied, as well as the time-dependent recovery of the surface after mechanical damage...
August 6, 2018: Soft Matter
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
Pankaj Rajak, Rajiv K Kalia, Aiichiro Nakano, Priya Vashishta
Reactive molecular dynamics simulations are performed to study self-healing of cracks in Al2 O3 containing core/shell SiC/SiO2 nanoparticles. These simulations are carried out in a pre-cracked Al2 O3 under mode 1 strain at 1,426°C. The nanoparticles are embedded ahead of the pre-crack in the Al2 O3 matrix. When the crack begins to propagate at a strain of 2%, the nanoparticles closest to the advancing crack distort to create nanochannels through which silica flows towards the crack and stops its growth. At this strain, the Al2 O3 matrix at the interface of SiC/SiO2 nanoparticles forms facets along the prismatic (A) <2 ̅110> and prismatic (M) <1 ̅010> planes...
August 3, 2018: ACS Nano
Zijian Zheng, Xiuyang Xia, Xianxiang Zeng, Xiu Li, Youping Wu, Jun Liu, Liqun Zhang
The matrix-free polymer nanocomposites (PNCs) formed by polymer-grafted nanoparticles(NPs) gain enormous attention due to their controllable morphology and robust properties. Herein, through molecular dynamics simulation, such PNCs are successfully constructed, and the dispersion state of the NPs can be tailored by varying the grafting density. By manipulating the interaction strength between the end groups of the grafted polymer chains, the tensile fracture behavior and the chain orientation are examined. It is revealed that both of them fall down at large strain because of the propagation of the cavities...
August 3, 2018: Macromolecular Rapid Communications
Yue Lai, Xiao Kuang, Ping Zhu, Miaoming Huang, Xia Dong, Dujin Wang
Robust self-healing thermoplastic elastomers are expected to have repeated healing capability, remarkable mechanical properties, transparency, and superior toughness. The phase-locked design in this work provides excellent tensile mechanical properties and efficient healability at a moderate temperature due to the dynamic disulfide bonds embedded in the hard segments and mainly being locked in the viscoelastic hard microphase region. The self-healing elastomers exhibit a maximum tensile stress of 25 MPa and a fracture strain of over 1600%, which are quite prominent compared to previous reports...
August 2, 2018: Advanced Materials
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