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flexible electronics

Philip Serwer, Elena T Wright, Borries Demeler, Wen Jiang
Mature double-stranded DNA bacteriophages have capsids with symmetrical shells that typically resist disruption, as they must to survive in the wild. However, flexibility and associated dynamism assist function. We describe biochemistry-oriented procedures used to find previously obscure flexibility for capsids of the related phages, T3 and T7. The primary procedures are hydration-based buoyant density ultracentrifugation and purified particle-based cryo-electron microscopy (cryo-EM). We review the buoyant density centrifugation in detail...
December 14, 2017: Biophysical Reviews
Swatantra Pratap Singh, Yilun Li, Jibo Zhang, James M Tour, Christopher J Arnusch
Graphene based materials have profoundly impacted research in nanotechnology and this has significantly advanced biomedical, electronics, energy, and environmental applications. Laser-induced graphene (LIG) is made photothermally and has enabled a rapid route for graphene layers on polyimide surfaces. However, polysulfone (PSU), polyethersulfone (PES), and polyphenylsulfone (PPSU) are highly used in numerous applications including medical, energy and water treatment and they are critical components of polymer membranes...
December 14, 2017: ACS Nano
Lei Yao, Wei Pan, Jian Luo, Xiaohui Zhao, Jing Cheng, Hiroki Nishijima
Nanocrystalline materials often exhibit extraordinary mechanical and physical properties, but their applications at elevated temperatures are impaired by the rapid grain growth. Moreover, the grain growth in nanocrystalline oxide nanofibers at high temperatures can occur at hundreds of degrees lower than that would occur in corresponding bulk nanocrystalline materials, which would eventually break the fibers. Herein, by characterizing a model system of scandia-stabilized zirconia (ScSZ) using hot-stage in-situ scanning transmission electron microscopy (STEM), we discover that the enhanced grain growth in nanofibers is initiated at the surface...
December 14, 2017: Nano Letters
Qiuhong Cui, Guillermo C Bazan
Two essential structural elements define a class of materials called conjugated polyelectrolytes (CPEs). The first is a polymer framework with an electronically delocalized, π-conjugated structure. This component allows one to adjust desirable optical and electronic properties, for example the range of wavelengths absorbed, emission quantum yields, electron affinity, and ionization potential. The second defining feature is the presence of ionic functionalities, which are usually linked via tethers that can modulate the distance of the charged groups relative to the backbone...
December 14, 2017: Accounts of Chemical Research
Wenhui Wu, Wei Jiang, Jiang Yang, Shaoxiang Gong, Yungui Ma
Analogy optical devices (AODs) able to do mathematical computations have recently gained strong research interest for their potential applications as accelerating hardware in traditional electronic computers. The performance of these wavefront-processing devices is primarily decided by the accuracy of the angular spectral engineering. In this Letter, we show that the multilayer technique could be a promising method to flexibly design AODs according to the input wavefront conditions. As examples, various Si-SiO2-based multilayer films are designed that can precisely perform the second-order differentiation for the input wavefronts of different Fourier spectrum widths...
December 15, 2017: Optics Letters
M Fumanal, E Gindensperger, C Daniel
The effects of ligand substitution and conformational flexibility on the ultrafast luminescent decay of [Re(CO)3(phen)(L)]+ (L = imidazole, pyridine) complexes are investigated by means of density functional theory (DFT/time-dependent DFT (TD-DFT)) electronic structure calculations and non-adiabatic quantum dynamics based on the linear vibronic coupling (LVC) approach including spin-orbit coupling (SOC) applied to the Cs conformers. The optical, luminescent and structural properties are not drastically affected either by the ligand substitution, or by the ligand rotation...
December 14, 2017: Physical Chemistry Chemical Physics: PCCP
Clara Minto, Giulia Beltrame Vriz, Matteo Martinato, Dario Gregori
Background: Nursing and health care research are increasingly using e-questionnaires and e-forms for data collection and survey conduction. The main reason lies in costs, time and data-entry errors containment, increased flexibility, functionality and usability. In spite of this growing usage, no specifc and comprehensive guidelines for designing and submitting e-questionnaires have been produced so far. Objective: The aim of this review is to collect information on the current best practices, taking them from various fields of application...
2017: Open Nursing Journal
Tingting Liu, Jianwen Zhao, Weiwei Xu, Junyan Dou, Xinluo Zhao, Wei Deng, Changting Wei, Wenya Xu, Wenrui Guo, Wenming Su, Jiansheng Jie, Zheng Cui
Fabrication and application of hybrid functional circuits have become a hot research topic in the field of printed electronics. In this study, a novel flexible diode-transistor logic (DTL) driving circuit is proposed, which was fabricated based on a light emitting diode (LED) integrated with printed high-performance single-walled carbon nanotube (SWCNT) thin-film transistors (TFTs). The LED, which is made of AlGaInP on GaAs, is commercial off-the-shelf, which could generate free electrical charges upon white light illumination...
December 13, 2017: Nanoscale
A Hosseinian, E Vessally, M Babazadeh, L Edjlali, M Es'haghi
The stable local minima due to the addition of the Li atom to the double-ring and the quasiplanar configurations of the B24 molecule have been searched on the doublet potential energy surface to reveal the structural and electronic features of the Li@B24 system. We report two and seven stable local minima without imaginary vibrational frequency for the Li@B24(double-ring) and the Li@B24(quasiplanar) systems, respectively. The criteria of the adsorption energy, the vertical ionization (VI) energy, the deformation energy, the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) energy gap, the atomic charges, the spin density distribution, the electron transfer (ET), atoms in molecules (AIM) analysis and the nonlinear optical (NLO) properties have been investigated for all the reported molecules of the Li@B24 system in the present paper...
December 7, 2017: Journal of Molecular Graphics & Modelling
Sanghoon Park, Yura Kim, Hyosub Jung, Jun-Young Park, Naesung Lee, Yongho Seo
In this study, we investigated an energy harvesting effect of tensile stress using piezoelectric polymers and flexible electrodes. A chemical-vapor-deposition grown graphene film was transferred onto both sides of the PVDF and P(VDF-TrFE) films simultaneously by means of a conventional wet chemical method. Output voltage induced by sound waves was measured and analyzed when a mechanical tension was applied to the device. Another energy harvester was made with a metallic electrode, where Al and Ag were deposited by using an electron-beam evaporator...
December 11, 2017: Scientific Reports
Hang Zhang, Zhongheng Fu, Ruifeng Zhang, Qianfan Zhang, Hongzhen Tian, Dominik Legut, Timothy C Germann, Yuanqi Guo, Shiyu Du, Joseph S Francisco
Efficient flexible energy storage systems have received tremendous attention due to their enormous potential applications in self-powering portable electronic devices, including roll-up displays, electronic paper, and "smart" garments outfitted with piezoelectric patches to harvest energy from body movement. Unfortunately, the further development of these technologies faces great challenges due to a lack of ideal electrode materials with the right electrochemical behavior and mechanical properties. MXenes, which exhibit outstanding mechanical properties, hydrophilic surfaces, and high conductivities, have been identified as promising electrode material candidates...
December 11, 2017: Proceedings of the National Academy of Sciences of the United States of America
Narahari Akkaladevi, Filiz Bunyak, David Stalla, Tommi A White, Gerald L Hazelbauer
Transmembrane bacterial chemoreceptors are extended, rod-shaped homodimers with ligand-binding sites at one end and interaction sites for formation of signaling complexes and histidine kinase control at the other. There are atomic-resolution structures of chemoreceptor fragments but not of intact, membrane-inserted receptors. Electron tomography of in vivo signaling complex arrays lack distinct densities for chemoreceptor rods away from the well-ordered base plate region, implying structural heterogeneity. We investigated using negative staining, transmission electron microscopy and image analysis to characterize molecular shapes of intact homodimers of Escherichia coli aspartate receptor Tar rendered functional by insertion into Nanodisc-provided E...
December 11, 2017: Journal of Bacteriology
Carmen C Mayorga-Martínez, Zdenek Sofer, Jan Luxa, Stepan Huber, David Sedmidubsky, Petr Brázda, Lukas Palatinus, Martin Mikulics, Petr Lazar, Rostislav Medlín, Martin Pumera
The layered materials like transition metal dichalcogenides exhibit broad spectra of outstanding properties with huge application potential, while another group of related materials, layered transition metal trichalcogenides remains unexplored. Here we show a broad application potential of this interesting structural type of layered tantalum trisulfide prepared in a form of nanofibers. This material shows tailorable attractive electronic properties dependent on the tensile strain applied to it. Structure of this so-called orthorhombic phase of TaS3 grown in a form of long nanofibers has been solved and refined...
December 11, 2017: ACS Nano
Tae Gon Kim, Hye Jin Park, Kyoohee Woo, Sunho Jeong, Youngmin Choi, Su Yeon Lee
Conductive metallic nanomaterials applicable to low-cost and scalable methods have attracted great attention. Among these, Cu-based electrodes appear promising for flexible and stretchable electronic devices. However, Cu nanoparticle (NP)-based electrodes are inherently sensitive to oxygen and moisture, which hinder their practical applications. In this work, fabrication and application of highly conductive, robust, flexible, and oxidation-resistant Cu-Ni core-shell NP-based electrodes have been reported. Cu@Ni core-shell NPs with a tunable Ni shell thickness were synthesized by varying the Cu/Ni molar ratios in the precursor solution...
December 11, 2017: ACS Applied Materials & Interfaces
S Mahdi Hamidinejad, Raymond K M Chu, Biao Zhao, Chul B Park, Tobin Filleter
As electronic devices become increasingly miniaturized, their thermal management becomes critical. Efficient heat dissipation guarantees their optimal performance and service life. Graphene nanoplatelets (GnPs) have excellent thermal properties that show promise for use in fabricating commercial polymer nanocomposites with high thermal conductivity. Herein an industrially-viable technique for manufacturing a new class of lightweight GnP-polymer nanocomposites with high thermal conductivity is presented. Using this method, high-density-polyethylene (HDPE)-GnP nanocomposites with a microcellular structure are fabricated by melt mixing, which is followed by supercritical fluid (SCF)-treatment and injection molding foaming which adds an extra layer of design flexibility...
December 11, 2017: ACS Applied Materials & Interfaces
Chong Cheng, Jianguang Zhang, Shuang Li, Yi Xia, Chuanxiong Nie, Zhenqiang Shi, Jose Luis Cuellar-Camacho, Nan Ma, Rainer Haag
The capabilities of conductive nanomaterials to be produced in liquid form with well-defined chemical, physical, and biological properties are highly important for the construction of next-generation flexible bioelectronic devices. Although functional graphene nanomaterials can serve as attractive liquid nanoink platforms for the fabrication of bioelectronics, scalable synthesis of graphene nanoink with an integration of high colloidal stability, water processability, electrochemical activity, and especially bioactivity remains a major challenge...
December 11, 2017: Advanced Materials
Yangyang Zhang, Bingwei Lu, Chaofeng Lü, Xue Feng
Self-powered implantable devices with flexible energy harvesters are of significant interest due to their potential to solve the problem of limited battery life and surgical replacement. The flexible electronic devices made of piezoelectric materials have been employed to harvest energy from the motion of biological organs. Experimental measurements show that the output voltage of the device mounted on porcine left ventricle in chest closed environment decreases significantly compared to the case of chest open...
November 2017: Proceedings. Mathematical, Physical, and Engineering Sciences
Murilo Priori Alcalde, Marco Antonio Hungaro Duarte, Clovis Monteiro Bramante, Bruno Carvalho de Vasconselos, Mario Tanomaru-Filho, Juliane Maria Guerreiro-Tanomaru, Jader Carvalho Pinto, Marcus Vinicius Reis Só, Rodrigo Ricci Vivan
OBJECTIVES: The aim of this study was to evaluate the cyclic and torsional fatigue resistance of the reciprocating single-file systems Reciproc Blue 25.08 (VDW GmbH, Munich, Germany), Prodesign R 25.06 (Easy Dental Equipment, Belo Horizonte, Brazil), and WaveOne Gold 25.07 (Dentsply/Tulsa Dental Specialties, Tulsa, OK, USA). MATERIALS AND METHODS: Sixty reciprocating instruments of the systems Reciproc Blue R25 (RB #25 .08 taper), Prodesign R (PDR #25 .06 taper), and WaveOne Gold (WOG #25 ...
December 9, 2017: Clinical Oral Investigations
Bai Sun, Shouhui Zhu, Shuangsuo Mao, Pingping Zheng, Yudong Xia, Feng Yang, Ming Lei, Yong Zhao
An environmental-friendly, sustainable, pollution-free, biodegradable, flexible and wearable electronic device hold advanced potential applications. Here, an organic resistive switching memory device with Ag/Leaves/Ti/PET structure on a flexible polyethylene terephthalate (PET) substrate was fabricated for the first time. We observed an obvious resistive switching memory characteristic with large switching resistance ratio and stable cycle performance at room temperature. This work demonstrates that leaves, a useless waste, can be properly treated to make useful devices...
December 5, 2017: Journal of Colloid and Interface Science
Eduarda Lopes Martins, Juliana Carvalho Ricardo, Eduardo de-Souza-Ferreira, Juliana Camacho-Pereira, Dionizio Ramos-Filho, Antonio Galina
Different exercise protocols lead to long-term adaptations that are related to increased mitochondrial content through the activation of mitochondrial biogenesis. However, immediate mitochondrial response to exercise and energetic substrate utilization is still unknown. We evaluate the mitochondrial physiology of two types rat skeletal muscle fibres immediately after a single session of high intensity interval exercise (HIIE) or aerobic exercise (AER). We found AER was able to reduce the ATP synthesis dependent oxygen flux in the tibialis (TA) when stimulated by complex I and II substrates...
December 5, 2017: Comparative Biochemistry and Physiology. Part B, Biochemistry & Molecular Biology
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