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https://www.readbyqxmd.com/read/29793133/an-ultrasensitive-and-selective-electrochemical-aptasensor-based-on-rgo-mwcnts-chitosan-carbon-quantum-dot-for-the-detection-of-lysozyme
#1
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
https://www.readbyqxmd.com/read/29792419/as-iii-removal-from-drinking-water-by-carbon-nanotube-membranes-with-magnetron-sputtered-copper-performance-and-mechanisms
#2
Hongyan Luan, Quan Zhang, Guo-An Cheng, Haiou Huang
Current approaches for functionalizing carbon nanotubes (CNT) often utilize harsh chemical conditions and the resulting harmful wastes can cause various environmental and health concerns. In this study, magnetron-sputtering technique is facilely employed to functionalize CNT membranes by depositing Cu onto pre-made CNT membranes without using any chemical treatment. A comparative evaluation of the substrate polymeric membrane (MCE), MCE sputtered with copper (Cu/MCE), the pristine CNT membrane (CNT), and CNT membrane sputtered with Cu (Cu/CNT) shows that Cu/CNT possesses mechanically stable structures and similar membrane permeability as MCE...
May 24, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29792028/in-situ-structural-elucidation-and-selective-pb2-ion-recognition-of-polydopamine-film-formed-by-controlled-electrochemical-oxidation-of-dopamine
#3
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
https://www.readbyqxmd.com/read/29791805/identifying-the-nonradical-mechanism-in-the-peroxymonosulfate-activation-process-singlet-oxygenation-versus-mediated-electron-transfer
#4
Eun-Tae Yun, Jeong Hoon Lee, Jaesung Kim, Hee-Deung Park, Jaesang Lee
Select persulfate activation processes were demonstrated to initiate oxidation not reliant on sulfate radicals, though the underlying mechanism has yet to be identified. This study explored singlet oxygenation and mediated electron transfer as plausible nonradical mechanisms for organic degradation by carbon nanotube (CNT)-activated peroxymonosulfate (PMS). The degradation of furfuryl alcohol (FFA) as a singlet oxygen (1O2) indicator and the kinetic retardation of FFA oxidation in the presence of L-histidine and azide as 1O2 quenchers apparently supported a role of 1O2 in the CNT/PMS system...
May 23, 2018: Environmental Science & Technology
https://www.readbyqxmd.com/read/29791138/a-three-dimensional-printed-poly-vinyl-alcohol-substrate-with-controlled-on-demand-degradation-for-transient-electronics
#5
Jinsu Yoon, Jungmin Han, Bongsik Choi, Yongwoo Lee, Yeamin Kim, Jinhee Park, Meehyun Lim, Min-Ho Kang, Dae Hwan Kim, Dong Myong Kim, Sungho Kim, Sung-Jin Choi
Electronics that degrade after stable operation for a desired operating time, called transient electrons, are of great interest in many fields, including biomedical implants, secure memory devices, and environmental sensors. Thus, the development of transient materials is critical for the advancement of transient electronics and their applications. However, previous reports have mostly relied on achieving transience in aqueous solutions where the transience time is largely pre-determined based on the materials initially selected at the beginning of fabrication...
May 23, 2018: ACS Nano
https://www.readbyqxmd.com/read/29790490/a-multi-walled-carbon-nanotube-based-magnetic-molecularly-imprinted-polymer-as-a-highly-selective-sorbent-for-ultrasonic-assisted-dispersive-solid-phase-microextraction-of-sotalol-in-biological-fluids
#6
Saeedeh Ansari, Saeed Masoum
A modified multiwalled carbon nanotube-based magnetic molecularly imprinted polymer (MWCNT-MMIP) was synthesized and applied for selective extraction and preconcentration of sotalol (SOT) in biological fluid samples by using ultrasonic-assisted dispersive solid-phase microextraction (UA-DSPME). The synthetic particles were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) analysis, vibrating sample magnetometry (VSM) and Fourier transform infrared spectroscopy (FTIR)...
May 23, 2018: Analyst
https://www.readbyqxmd.com/read/29790054/removal-of-cobalt-and-lead-ions-from-wastewater-samples-using-an-insoluble-nanosponge-biopolymer-composite-adsorption-isotherm-kinetic-thermodynamic-and-regeneration-studies
#7
Anny Leudjo Taka, Elvis Fosso-Kankeu, Kriveshini Pillay, Xavier Yangkou Mbianda
In this study, an insoluble nanosponge biopolymer composite was synthesized, using a combined process of amidation reaction, cross-linking polymerization, and sol-gel method to obtain a phosphorylated multiwalled carbon nanotube-cyclodextrin/silver-doped titania (pMWCNT-βCD/TiO2 -Ag). This work mainly emphasized on the removal of lead (Pb2+ ) and cobalt (Co2+ ) metal ions from synthetic and real wastewater samples using the synthesized pMWCNT-βCD/TiO2 -Ag as a biosorbent. The new material was characterized by Fourier transform infrared (FTIR) spectroscopy, zeta potential, Brunauer-Emmett-Teller (BET) method, and scanning electron microscopy (SEM)...
May 23, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29789826/structural-optoelectronic-and-charge-transport-properties-of-the-complexes-of-indigo-encapsulated-in-carbon-nanotubes
#8
Ankita Joshi, C N Ramachandran
Using the dispersion-corrected density functional B97D and 6-31g(d,p) basis set, the structural, stability, electronic, optical and charge transport properties of the complexes formed by encapsulating indigo inside carbon nanotubes (CNTs) of varying diameters are investigated. Based on the stabilization energy of the complexes indigo@(n,n)CNT (where n = 6, 7 and 8), indigo@(7,7)CNT is shown to be the most stable owing to the ideal diameter of (7,7)CNT for encapsulating indigo. The nature of the interaction between the guest and the host is investigated by means of energy decomposition analysis employing the symmetry adapted perturbation theory...
May 23, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29788721/vanishing-thermal-conductance-of-carbon-nanotube-upon-encapsulation-by-zig-zag-sulfur-chain
#9
Sayantanu Koley, Sabyasachi Sen, Swapan Chakrabarti
Herein we report an unprecedented enhancement of thermoelectric properties of a single walled carbon nanotube upon encapsulation of a zig-zag sulfur chain inside the nanocore. Our calculations on a 70 Å long [5; 5] carbon nanotube reveals that the encapsulation of zig-zag sulfur chain will lead to 107% increase in the thermoelectric gure of merit and concomitant quenching of thermal conductance by 90%. We have noticed that finite transmission gradient at the Fermi level combined with destructive quantum interference at the sulfur sites and structural conformation dependent scattering induced damping of phonon transmission are attributed to the dramatic improvement of thermoelectric behavior of this material...
May 23, 2018: Journal of Physical Chemistry Letters
https://www.readbyqxmd.com/read/29788500/microvascular-dysfunction-following-multi-walled-carbon-nanotube-exposure-is-mediated-by-thrombospondin-1-receptor-cd47
#10
W Kyle Mandler, Timothy R Nurkiewicz, Dale W Porter, Eric E Kelley, I Mark Olfert
Pulmonary exposure to multi-walled carbon nanotubes (MWCNT) disrupts peripheral microvascular function. Thrombospondin-1 (TSP-1) is highly expressed during lung injury and has been shown to alter microvascular reactivity. It is unclear exactly how TSP-1 exerts effects on vascular function, but we hypothesized that the TSP-1 receptor CD47 may mediate changes in vasodilation.Wildtype (WT) or CD47 knockout (CD47 KO) C57B6/J-background animals were exposed to 50 µg of MWCNT or saline control via pharyngeal aspiration...
May 21, 2018: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/29787970/functional-polyaniline-multiwalled-carbon-nanotube-composite-as-an-efficient-adsorbent-material-for-removing-pharmaceuticals-from-aqueous-media
#11
Flávia Viana Avelar Dutra, Bruna Carneiro Pires, Tienne Aparecida Nascimento, Keyller Bastos Borges
The composite polyaniline/multiwalled carbon nanotube (PAni/MWCNT, 1:0.1 w/w) was developed with the intention of binding the adsorbent properties of two materials and using it to adsorb pharmaceuticals from aqueous media. PAni/MWCNT was characterized by scanning electron microscopy, thermogravimetry, infrared spectroscopy, pH at the point of zero charge, and the effect on the surface wettability of the material. As proof of concept, adsorption studies were carried out using meloxicam (MLX) as the pharmaceutical and it was evaluated as a function of pH, temperature, ionic strength, contact time and variation in concentration...
May 19, 2018: Journal of Environmental Management
https://www.readbyqxmd.com/read/29787948/preparation-and-application-of-a-molecular-capture-for-safety-detection-of-cosmetics-based-on-surface-imprinting-and-multi-walled-carbon-nanotubes
#12
Fang Wang, Xiaoyan Li, Junjie Li, Chen Zhu, Min Liu, Zongyuan Wu, Li Liu, Xuecai Tan, Fuhou Lei
A novel composite material for prednisone molecular capture (PS-MC) was prepared by surface imprinting technique in combination with a polyethylene filter plate coated with multi-walled carbon nanotubes for the first time. PS-MC was achieved by using prednisone as the template molecule, 3-aminopropyltriethoxysilane as the monomer, and tetraethoxysilane as the cross-linker. The structure, morphology, and thermal stability of the prepared PS-MC were studied by fourier-transform infrared spectrometry, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and thermogravimetric analysis...
May 14, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29787678/three-dimensional-solid-state-mixed-electron-ion-conductive-framework-for-lithium-metal-anode
#13
Shaomao Xu, Dennis W McOwen, Chengwei Wang, Lei Zhang, Wei Luo, Chaoji Chen, Yiju Li, Yunhui Gong, Jiaqi Dai, Yudi Kuang, Chunpeng Yang, Tanner R Hamann, Eric D Wachsman, Liangbing Hu
Solid-state electrolytes (SSEs) have been widely considered as enabling materials for the practical application of lithium metal anodes. However, many problems inhibit the widespread application of solid state batteries, including the growth of lithium dendrites, high interfacial resistance, and the inability to operate at high current density. In this study, we report a 3D mixed electron/ion conducting framework (3D-MCF) based on a porous-dense-porous trilayer garnet electrolyte structure created via tape casting to facilitate the use of a 3D solid state lithium metal anode...
May 22, 2018: Nano Letters
https://www.readbyqxmd.com/read/29787673/freeze-dried-carbon-nanotube-aerogels-for-high-frequency-absorber-applications
#14
Ilya V Anoshkin, James Campion, Dmitry V Lyubchenko, Joachim Oberhammer
A novel technique for millimeter wave absorber material embedded in a metal waveguide is proposed. The absorber material is a highly-porous carbon nanotube (CNT) aerogel prepared by freeze-drying technique. CNT aerogel structures are shown to be a good absorber with a low reflection coefficient, less than -12 dB at 95 GHz. Reflection coefficient of the novel absorber is 3-4 times lower than that of commercial absorbers with identical geometry. Samples prepared by freeze-drying at -25 °C demonstrate resonance behavior while those prepared at liquid nitrogen temperature (-196 °C) exhibit a significant decrease in reflection coefficient, with no resonant behavior...
May 22, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29787672/oxidized-nanocarbons-tripeptide-supramolecular-hydrogels-shape-matters
#15
Daniel Iglesias, Manuel Melle-Franco, Marina Kurbasic, Michele Melchionna, Michela Abrami, Mario Grassi, Maurizio Prato, Silvia Marchesan
Short peptide hydrogels are attractive biomaterials but typically suffer from limited mechanical properties. Inclusion of other nanomaterials can serve the dual purpose of hydrogel reinforcement and of conferring additional physico-chemical properties ( e.g., self-healing, conductivity), as long as they do not hamper peptide self-assembly. In particular, nanocarbons are ideal candidates and their physico-chemical properties have demonstrated great potential in nanocarbon-polymer gel biomaterials for tissue engineering or drug delivery...
May 22, 2018: ACS Nano
https://www.readbyqxmd.com/read/29787248/efficient-n-doping-and-hole-blocking-in-single-walled-carbon-nanotube-transistors-with-1-2-4-5-tetrakis-tetramethyl-guanidino-benzene
#16
Severin Schneider, Maximilian Brohmann, Roxana Lorenz, Yvonne J Hofstetter, Marcel Rother, Eric Sauter, Michael Zharnikov, Yana Vaynzof, Hans-Joerg Himmel, Jana Zaumseil
Efficient, stable and solution-based n-doping of semiconducting single-walled carbon nanotubes (SWCNTs) is highly desired for complementary circuits but remains a significant challenge. Here we present 1,2,4,5-tetrakis(tetramethyl-guanidino)benzene (ttmgb) as a strong two-electron donor that enables the fabrication of purely n-type SWCNT field-effect transistors (FETs). We apply ttmgb to networks of monochiral, semiconducting (6,5) SWCNTs that show intrinsic ambipolar behavior in bottom-contact/top-gate FETs and obtain unipolar n-type transport with 3 to 5 fold enhancement of electron mobilities (approx...
May 22, 2018: ACS Nano
https://www.readbyqxmd.com/read/29786972/a-lyophilized-and-thermal-two-step-synthesis-of-cofe-alloy-nanoparticles-embedded-in-n-doped-carbon-nanosheets-carbon-nanotubes-for-highly-efficient-oxygen-evolution-reaction
#17
Yang Liu, Feng Li, Haidong Yang, Jing Li, Ping Ma, Yan Zhu, Jiantai Ma
There is a vital need to explore highly-efficient and stable nonprecious-metal catalysts for oxygen evolution reaction (OER) to reduce the overpotential and further improve the energy conversion efficiency. Herein, we report a unique and cost-effective lyophilized and thermal two step procedure to synthesize high-performance CoFe alloy nanoparticles embedded in N-doped carbon nanosheets interspersed with carbon nanotubes (CoFe-N-CN/CNTs) hybrid. The lyophilization step during catalysts preparation is beneficial to uniform the dispersion of carbon-like precursors and avoid the agglomeration of metal particles...
May 22, 2018: ChemSusChem
https://www.readbyqxmd.com/read/29786661/suspended-carbon-nanotubes-for-humidity-sensing
#18
Shivaram Arunachalam, Anubha A Gupta, Ricardo Izquierdo, Frederic Nabki
A room temperature microfabrication technique using SU8, an epoxy-based highly functional photoresist as a sacrificial layer, is developed to obtain suspended aligned carbon nanotube beams. The humidity-sensing characteristics of aligned suspended single-walled carbon nanotube films are studied. A comparative study between suspended and non-suspended architectures is done by recording the resistance change in the nanotubes under humidity. For the tests, the humidity was varied from 15% to 98% RH. A comparative study between suspended and non-suspended devices shows that the response and recovery times of the suspended devices was found to be almost 3 times shorter than the non-suspended devices...
May 22, 2018: Sensors
https://www.readbyqxmd.com/read/29786444/exploring-the-confinement-effect-of-carbon-nanotubes-on-the-electrochemical-properties-of-prussian-blue-nanoparticles
#19
Ti-Wei Chen, Zhong-Qiu Li, Kang Wang, Feng-Bin Wang, Xing-Hua Xia
A novel and efficient photochemical method has been proposed for the encapsulation of Prussian blue nanoparticles (PBNPs) inside the channels of carbon nanotubes (PB-in-CNTs) in an acidic ferrocyanide solution under UV/Vis illumination and the confinement effect of CNTs on the electrochemical properties of PBNPs is systematically explored. PB-in-CNTs shows a faster electron transfer process, an enhanced electrocatalytic activity toward the reduction of H2O2 and an increased anti-base ability compared to PBNPs loaded outside of CNTs (PB-out-CNTs)...
May 22, 2018: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29785854/high-k-gate-dielectrics-for-emerging-flexible-and-stretchable-electronics
#20
Binghao Wang, Wei Huang, Lifeng Chi, Mohammed Al-Hashimi, Tobin J Marks, Antonio Facchetti
Recent advances in flexible and stretchable electronics (FSE), a technology diverging from the conventional rigid silicon technology, have stimulated fundamental scientific and technological research efforts. FSE aims at enabling disruptive applications such as flexible displays, wearable sensors, printed RFID tags on packaging, electronics on skin/organs, and Internet-of-things as well as possibly reducing the cost of electronic device fabrication. Thus, the key materials components of electronics, the semiconductor, the dielectric, and the conductor as well as the passive (substrate, planarization, passivation, and encapsulation layers) must exhibit electrical performance and mechanical properties compatible with FSE components and products...
May 22, 2018: Chemical Reviews
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