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Fabricating a strain sensor that can detect large deformation over a curved object with a high sensitivity is crucial in wearable electronics, human/machine interfaces, and soft robotics. Herein, an ionogel nanocomposite is presented for this purpose. Tuning the composition of the ionogel nanocomposites allows the attainment of the best features, such as excellent self‐healing (>95% healing efficiency),...
The unstable mechanical properties of flexible transparent conductive films (TCFs) make it difficult for them to meet the requirements for displays or wearable devices. Here, the relationship between the mechanism behind the bending behavior and the electrical properties, which is important for improving the mechanical stability of flexible TCFs, is explored. Flexible TCFs are reported based on silver...
Surface tension gradients induce Marangoni flow, which may be exploited for fluid transport. At the micrometer scale, these surface‐driven flows can be quite significant. By introducing fluid–fluid interfaces along the walls of microfluidic channels, bulk fluid flows driven by temperature gradients are observed. The temperature dependence of the fluid–fluid interfacial tension appears responsible...
Transition metal dichalcogenides exhibit several different phases (e.g., semiconducting 2H, metallic 1T, 1T′) arising from the collective and sluggish atomic displacements rooted in the charge‐lattice interaction. The coexistence of multiphase in a single sheet enables ubiquitous heterophase and inhomogeneous charge distribution. Herein, by combining the first‐principles calculations and experimental...
All‐inorganic cesium lead triiodide (CsPbI3) perovskite is considered a promising solution‐processable semiconductor for highly stable optoelectronic and photovoltaic applications. However, despite its excellent optoelectronic properties, the phase instability of CsPbI3 poses a critical hurdle for practical application. In this study, a novel stain‐mediated phase stabilization strategy is demonstrated...
Experimental setups to produce and to monitor model membranes have been successfully used for decades and brought invaluable insights into many areas of biology. However, they all have limitations that prevent the full in vitro mimicking and monitoring of most biological processes. Here, a suspended physiological bilayer‐forming chip is designed from 3D‐printing techniques. This chip can be simultaneously...
Microcapsules with molecule‐selective permeation are appealing as microreactors, capsule‐type sensors, drug and cell carriers, and artificial cells. To accomplish molecular size‐ and charge‐selective permeation, regular size of pores and surface charges have been formed in the membranes. However, it remains an important challenge to provide advanced regulation of transmembrane transport. Here, smart...
Endothelial and epithelial cells usually grow on a curved environment, at the surface of organs, which many techniques have tried to reproduce. Here a simple method is proposed to control curvature of the substrate. Prestrained thin elastomer films are treated by infrared laser irradiation in order to rigidify the surface of the film. Wrinkled morphologies are produced upon stress relaxation for irradiation...
The quest for sustainable energy sources has led to accelerated growth in research of organic solar cells (OSCs). A solution‐processed bulk‐heterojunction (BHJ) OSC generally contains a donor and expensive fullerene acceptors (FAs). The last 20 years have been devoted by the OSC community to developing donor materials, specifically low bandgap polymers, to complement FAs in BHJs. The current improvement...
Dip‐pen nanolithography (DPN) is a unique nanofabrication tool that can directly write a variety of molecular patterns on a surface with high resolution and excellent registration. Over the past 20 years, DPN has experienced a tremendous evolution in terms of applicable inks, a remarkable improvement in fabrication throughput, and the development of various derivative technologies. Among these developments,...
Aligned halloysite nanotubes on solid substrates are fabricated by a shearing method with brush assistance. These clay nanotubes are aligned by shear force in strip‐like patterns accomplished with drying ordering at elevated temperatures. The nanotubes' orientation is governed by “coffee‐ring” formation mechanisms depending on the dispersion concentration, nanotube charge, and speed of thermos‐evaporation...
Various antioxidants are being used to neutralize the harmful effects of reactive oxygen species (ROS) overproduced in diseased tissues and contaminated environments. Polymer‐directed crystallization of antioxidants has attracted attention as a way to control drug efficacy through molecular dissolution. However, most recrystallized antioxidants undertake continuous dissolution independent of the ROS...
In article number 1900357, Yuri Lvov, Mingxian Liu, and co‐workers report a simple method for preparing oriented clay nanotube architectures. The clay nanotubes are aligned by brush induced shear force into strip‐like patterns on different substrates at elevated temperature. This clay pattern can induce stem cell orientation growth and is promising for surface modification in tissue engineering materials...
Microcarriers with oxygen‐delivering capacity have attracted increasing interest in the field of tissue regeneration. Here, a kind of molybdenum disulfide quantum dots (MoS2 QDs) integrated responsive porous microcarriers with controllable oxygen‐delivering ability for wound healing is presented. The specific gelatin methacryloyl (GelMa) porous microcarriers are derived from inverse opal microparticles...
In article number 1900918, Deborah F. Kelly and co‐workers develop a new cryo‐electron microscopy (EM)‐on‐a‐chip approach. This strategy enables researchers to directly visualize the “fault in our stars” regarding cancer proteins. The structural assemblies of p53 from brain cancer cells are determined for the first time using the microchip‐based technique. Artistic rendition by Daryl N. Branford....
In article number 1900765, Jonghwi Lee, Young Jun Kim, Hyunjoon Kong, and co‐workers assemble a new drug‐delivery system prepared with stimulus‐responsive crystallized catechin–an antioxidant found in green tea and fruit–that can dissolve when the hydrogen peroxide level increases abnormally and restore the heart rate of water fleas.
MoS2 nanosheets as a promising 2D nanomaterial have extensive applications in energy storage and conversion, but their electrochemical performance is still unsatisfactory as an anode for efficient Li+/Na+ storage. In this work, the design and synthesis of vertically grown MoS2 nanosheet arrays, decorated with graphite carbon and Fe2O3 nanoparticles, on flexible carbon fiber cloth (denoted as Fe2O3...
In article number 1900162, Caterina Tomba, Valeriy Luchnikov, and co‐workers present a versatile approach to produce curved surfaces with dynamic and variable topographic parameters. Mid‐infrared laser exposure allows for surface stiffening of an elastomer that is suitable as wavy substrate to grow cells on smooth and more realistic micro‐environments. The wrinkled geometry is tuned by controlling...
In article number 1900219, Donghwa Lee, Jooho Moon, and co‐workers develop an approach to stabilize α‐CsPbI3 perovskite through strain engineering, whereby CsPbI3 perovskite is confined by a vertically aligned nanoporous template. By imposing a strain on the perovskite lattice, the ultra‐stable black α‐CsPbI3 with its desirable optoelectrical properties is obtained. This universally applicable template‐based...
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