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Marzieh Kajbafvala, Mansoor Farbod
Although liquid phase exfoliation is a powerful method to produce MoS2 nanosheets in large scale, but its effectiveness is limited by the diversity of produced nanosheets sizes. Here a novel approach for separation of MoS2 flakes having various lateral sizes and thicknesses based on the cascaded centrifugation has been introduced. This method involves a pre-separation step which is performed through low-speed centrifugation to avoid the deposition of large area single and few-layers by the heavier particles...
May 14, 2018: Journal of Colloid and Interface Science
Behzad Rezaei, Hamid Reza Jamei, Ali Asghar Ensafi
An aptamer-based method is described for the electrochemical determination of lysozyme. A glassy carbon electrode was modified with a nanocomposite composed of reduced graphene oxide (rGO), multi-walled carbon nanotubes (MWCNTs), chitosan (CS), and a synthesized carbon quantum dot (CQD) from CS. The composition of the nanocomposite (rGO-MWCNT/CS/CQD) warrants a high surface-to-volume ratio, high conductivity, high stability, and great electrocatalytic activity. This nanocomposite provides a suitable site for better immobilization of aptamers due to the existence of many amino and carboxyl functional groups, and remaining oxygen-related defects properties in rGO...
May 9, 2018: Biosensors & Bioelectronics
Yun Zheng, Lihua Zhao, Zhanfang Ma
Sensitivity amplification strategy by implementing click chemistry in the construction of biosensing interface can efficiently improve the performance of immunosensor. Herein, we developed a sandwich-type amperometric immunosensor for ultrasensitive detection of carbohydrate antigen 24-2 (CA 242) based on pH responsive label-assisted click chemistry triggered sensitivity amplification strategy. The sensitivity of amperometric immunosensor relies on the current response differences (ΔI) caused by per unit concentration target analyte...
May 15, 2018: Biosensors & Bioelectronics
Minsik Jo, Kyungtaek Min, Biswajit Roy, Sookyoung Kim, Sangmin Lee, Ji-Yong Park, Sunghwan Kim
Human skin provides an interface that transduces external stimuli into electrical signals for communication with the brain. There has been considerable effort to produce soft, flexible, and stretchable electronic skin (E-skin) devices. However, common polymers cannot imitate human skin perfectly due to their poor biocompatibility, biofunctionality, and permeability to many chemicals and biomolecules. Herein, we report on highly flexible, stretchable, conformal, molecule-permeable, and skin-adhering E-skins that combine a metallic nanowire (NW) network and silk protein hydrogel...
May 24, 2018: ACS Nano
Rose E Ruther, Kevin A Hays, Seong Jin An, Jianlin Li, David L Wood, Jagjit Nanda
Silicon-graphite composites are under development for the next generation of high-capacity lithium-ion anodes, and vibrational spectroscopy is a powerful tool to identify the different mechanisms that contribute to performance loss. With alloy anodes, the underlying causes of cell failure are significantly different in half-cells with lithium metal counter electrodes compared to full cells with standard cathodes. However, most studies which take advantage of vibrational spectroscopy have only examined half-cells...
May 24, 2018: ACS Applied Materials & Interfaces
Paulo Roberto Bueno
The merging of nanoscale electronics and electrochemistry can potentially modernize the way electronic devices are currently engineered or constructed. It is well known that the greatest challenges will involve not only miniaturizing and improving the performance of mobile devices, but also manufacturing reliable electrical vehicles, and engineering more efficient solar panels and energy storage systems. These are just a few examples of how technological innovation is dependent on both electrochemical and electronic elements...
May 24, 2018: Analytical Chemistry
Tao Cheng, Lu Wang, Boris V Merinov, William A Goddard
Hydrogen oxidation reaction (HOR) and hydrogen evolution reac-tion (HER) are both two orders slower in alkaline electrolyte than in acidic electrolyte, but no explanation has been provided. The first step towards understanding this dramatic pH-dependent HOR/HER performance is to explain the pH-dependent hydrogen binding to the electrode, a perplexing behavior observed experimentally. In this work, we carried out Quantum Mechanics Molecular Dynam-ics (QMMD) with explicit considerations of solvent and applied voltage (U) to in situ simulate water/Pt (100) interface in the condi-tion of under-potential adsorption of hydrogen (HUPD)...
May 24, 2018: Journal of the American Chemical Society
K S Shalini Devi, Sharu Jacob, Annamalai Senthil Kumar
Owing to the versatility and biocompatibility, a self-polymerized DA (in presence of air at pH 8.5 tris buffer solution) as a polydopamine (pDA) film has been used for a variety of applications. Indeed, instability under electrified condition (serious surface-fouling) and structural ambiguity of the pDA have been found to be unresolved problems. Previously, pDA films (has hygroscopic and insoluble property) prepared by various controlled chemical oxidation methods have been examined for the structural analysis using ex-situ solid-state NMR and Mass Spectroscopic techniques...
May 24, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
Zhe Zhao, Siliang Liu, Jixin Zhu, Jingsan Xu, Le Li, Zhaoqi Huang, Chao Zhang, Tianxi Liu
Interconnected close-packed nitrogen-doped porous carbon polyhedrons (NCPs) confined in a two-dimensional carbon nanosheets (CNSs) have been prepared through a sustainable one-pot pyrolysis of a simple solid mixture of zeolitic imidazolate framework-8 (ZIF-8) crystals and organic potassium as the precursors. The hierarchically organized framework of the NCP-CNS composites enables NCPs and CNSs acting as well-defined electrolyte reservoirs and mechanical buffers accommodating large volume expansions of NCPs, respectively...
May 24, 2018: ACS Applied Materials & Interfaces
Michael Bressan, Trevor Henley, Jonathan D Louie, Gary Liu, Danos Christodoulou, Xue Bai, Joan Taylor, Christine E Seidman, J G Seidman, Takashi Mikawa
Impulses generated by a multicellular, bioelectric signaling center termed the sinoatrial node (SAN) stimulate the rhythmic contraction of the heart. The SAN consists of a network of electrochemically oscillating pacemaker cells encased in a heterogeneous connective tissue microenvironment. Although the cellular composition of the SAN has been a point of interest for more than a century, the biological processes that drive the tissue-level assembly of the cells within the SAN are unknown. Here, we demonstrate that the SAN's structural features result from a developmental process during which mesenchymal cells derived from a multipotent progenitor structure, the proepicardium, integrate with and surround pacemaker myocardium...
May 22, 2018: Cell Reports
A T Ezhil Vilian, Rajamanickam Sivakumar, Yun Suk Huh, Ji Ho Youk, Young-Kyu Han
Metal nanoparticle-containing porous organic polymers have gained great interest in chemical and pharmaceutical applications owing to their high reactivity and good recyclability. In the present work, a palladium nanoparticle-decorated triazine-urea-based porous organic polymer (Pd@TU-POP) was designed and synthesized using 1, 3-bis (4-aminiphenyl) urea with cyanuric chloride and palladium acetate. The porous structure and physicochemical properties of this electrode material Pd@TU-POP were observed using a range of standard techniques...
May 23, 2018: ACS Applied Materials & Interfaces
Jiale Fu, Daobin Mu, Borong Wu, Jiaying Bi, Hui Cui, Hao Yang, Hanfeng Wu, Feng Wu
An amount (5wt.%) of lithium tungstate (Li2WO4) as an additive significantly improves the cycle and rate performances of LiNi0.6Co0.2Mn0.2O2 electrode at the cut-off voltage of 4.6V. The 5wt.% Li2WO4-mixed LiNi0.6Co0.2Mn0.2O2 electrode delivers a reversible capacity of 199.2 mAhg-1 and keeps 73.1% capacity for 200 cycles at 1C. It retains 67.4% capacity after 200 cycles at 2C and delivers a discharge capacity of 167.3mAh g-1 at 10C, while those of the pristine electrode are only 44.7% and 87.5mAh g-1, respectively...
May 23, 2018: ACS Applied Materials & Interfaces
Shiyuan Gao, Bin Wang, Xinyu Liu, Zhanhu Guo, Zhongqing Liu, Yichao Wang
Amorphous molybdenum sulfides (a-MoSx) have been demonstrated as economic and efficient hydrogen evolution catalysts for water splitting. Further improvements of their hydrogen evolution reaction (HER) activities could be achieved by coupling them with appropriate electron transfer intermediates via interfacial engineering. In this study, a novel ternary composite electrode comprising PbTe quantum dots (QDs), a-MoSx and TiO2 nanotube arrays (TNAs) was successfully fabricated by a facile combination of successive ionic layer adsorption and reaction (SILAR) and electrodeposition routes...
May 23, 2018: Nanoscale
Matteo Di Giosia, Paul H H Bomans, Andrea Bottoni, Andrea Cantelli, Giuseppe Falini, Paola Franchi, Giuseppe Guarracino, Heiner Friedrich, Marco Lucarini, Francesco Paolucci, Stefania Rapino, Nico A J M Sommerdijk, Alice Soldà, Francesco Valle, Francesco Zerbetto, Matteo Calvaresi
Hybrid systems have great potential for a wide range of applications in chemistry, physics and materials science. Conjugation of a biosystem to a molecular material can tune the properties of the components or give rise to new properties. As a workhorse, here we take a C60@lysozyme hybrid. We show that lysozyme recognizes and disperses fullerene in water. AFM, cryo-TEM and high resolution X-ray powder diffraction show that the C60 dispersion is monomolecular. The adduct is biocompatible, stable in physiological and technologically-relevant environments, and easy to store...
May 23, 2018: Nanoscale
JinCheng Du, YuHai Tang, Yu Wang, PengHui Shi, JinChen Fan, QunJie Xu, YuLin Min
In this work, we report a facile route to fabricate a ZnCo2O4 nanosheet derived from metal-organic frameworks. The as-prepared ZnCo2O4 nanosheet material for lithium-ion batteries shows an excellent electrochemical performance. The obtained ZnCo2O4 nanosheet delivers a high reversible capacity of 1640.8 mA h g-1 at a current density of 100 mA g-1 after 50 cycles. More importantly, even at a current density of 1500 mA g-1, the electrode material still exhibits a discharge capacity of 581.3 mA h g-1 after 190 cycles...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Sarah Keller, Alessandro Prescimone, Henk Bolink, Michele Sessolo, Giulia Longo, Laura Martínez-Sarti, José M Junquera-Hernández, Edwin C Constable, Enrique Ortí, Catherine E Housecroft
Heteroleptic [Cu(P^P)(N^N)][PF6] complexes, where N^N is a halo-substituted 2,2'-bipyridine (bpy) and P^P is either bis(2-(diphenylphosphino)phenyl)ether (POP) or 4,5-bis(diphenylphosphino)-9,9-dimethylxanthene (xantphos) have been synthesized and investigated. To stabilize the tetrahedral geometry of the copper(i) complexes, the steric demands of the bpy ligands have been increased by introducing 6- or 6,6'-halo-substituents in 6,6'-dichloro-2,2'-bipyridine (6,6'-Cl2bpy), 6-bromo-2,2'-bipyridine (6-Brbpy) and 6,6'-dibromo-2,2'-bipyridine (6,6'-Br2bpy)...
May 23, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Susheel K Mittal, Sonia Rana, Navneet Kaur, Craig E Banks
Herein, a potent electrochemical ionophore (SMS-2) based on a Schiff base has been used for the modification of a screen-printed electrode (SPE). The modified disposable electrode can selectively detect ferric ions in an aqueous medium. Redox behavior of the proposed strip was characterized using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Incorporation of the ligand in the ink of the SPE enhanced the analytical performance of the electrode, and its surface modification was confirmed by SEM and EDX analysis...
May 23, 2018: Analyst
Dharmendra Kumar Soni, Rafiq Ahmad, Suresh Kumar Dubey
The early detection of Listeria monocytogenes (L. monocytogenes) and understanding the disease burden is of paramount interest. The failure to detect pathogenic bacteria in the food industry may have terrible consequences, and poses deleterious effects on human health. Therefore, integration of methods to detect and trace the route of pathogens along the entire food supply network might facilitate elucidation of the main contamination sources. Recent research interest has been oriented towards the development of rapid and affordable pathogen detection tools/techniques...
May 23, 2018: Critical Reviews in Microbiology
Robert B Channon, Yuanyuan Yang, Kristen M Feibelman, Brian J Geiss, David S Dandy, Charles S Henry
Viral pathogens are a serious health threat around the world, particularly in resource limited settings, where current sensing approaches are often insufficient and slow, compounding the spread and burden of these pathogens. Here, we describe a la-bel-free, point-of-care approach towards detection of virus particles, based on a microfluidic paper-based analytical device with integrated microwire Au electrodes. The device is initially characterized through capturing of streptavidin modified na-noparticles by biotin-modified microwires...
May 23, 2018: Analytical Chemistry
Ying Jiang, Shi Chen, Daobin Mu, Zhikun Zhao, Chunli Li, Zepeng Ding, Chaoxiang Xie, Feng Wu
Flexible TiO2/SiO2/C films are prepared via an electrospinning approach and used as self-supporting electrodes for LIBs, which exhibits excellent high-rate capability with a capacity of 115.5 mA h g-1 at 8 A g-1 (9.8 C rate) and good storage performance. It also shows great long-term cycle of 700 cycles at 200 mA g-1 with a capacity of 380.1 mA h g-1 and a high capacity retention of 88.3%s. Thus, it has the potential as electrodes for flexible LIBs owing to its flexibility and excellent electrochemical performance...
May 22, 2018: ChemSusChem
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