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https://www.readbyqxmd.com/read/28926252/absolute-enantiomeric-excess-determination-of-carbon-nanotubes-ensemble-by-symmetry-breaking-using-optical-titration-method
#1
Jinsook Sim, Somin Kim, Myungsu Jang, Minsuk Park, Hyunkyu Oh, Sang-Yong Ju
Symmetry breaking of single-walled carbon nanotubes (SWNTs) has profound effects on their optoelectronic properties which are essential for fundamental study and applications. Here, we show that isomeric SWNT which exhibit identical photoluminescence (PL) undergo symmetry breaking by flavin mononucleotide (FMN) and exhibits dual PLs and different binding affinity (Ka). Increasing FMN concentration leads to systematic PL shifts of SWNT according to structural modality and handedness due to symmetry breaking...
September 19, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28926229/in-situ-derived-nixfe1-xooh-nife-nixfe1-xooh-nanotube-arrays-from-nife-alloys-as-efficient-electrocatalysts-for-oxygen-evolution
#2
An-Liang Wang, Yu-Tao Dong, Mei Li, Chaolun Liang, Gao-Ren Li
Herein, NixFe1-xOOH/NiFe/NixFe1-xOOH sandwich-structured nanotube arrays (SNTAs) supported on carbon fiber cloth (CFC) (NixFe1-xOOH/NiFe/NixFe1-xOOH SNTAs-CFC) have been developed as flexible high-performance OER catalysts by a facile in-situ electrochemical oxidation of NiFe metallic alloy nanotube arrays (ANTAs) during oxygen evolution process. Benefiting from the advantages of high conductivity, hollow nanotube array and porous strucuture, NixFe1-xOOH/NiFe/NixFe1-xOOH SNTAs-CFC exhibited a low overpotential of ~220 mV at the current density of 10 mA cm-2 and a small Tafel slope of 52 mV dec-1 in alkaline solution, which both are smaller than those of most OER electrocatalysts...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28925924/in-situ-preparation-of-fe-sub-3-sub-o-sub-4-sub-in-a-carbon-hybrid-of-graphene-nanoscrolls-and-carbon-nanotubes-as-high-performance-anode-material-for-lithium-ion-batteries
#3
Yuewen Liu, Ahmad Hassan Siddique, Heran Huang, Qile Fang, Wei Deng, Xufeng Zhou, Huanming Lu, Z P Liu
A new conductive carbon hybrid combining both graphene nanoscrolls and carbon nanotubes (rGNSs-CNTs) is prepared, and used to host Fe3O4 nanoparticles through an in situ synthesis method. As an anode material for LIBs, the obtained Fe3O4@rGNSs-CNTs shows good electrochemical performance. At a current density of 0.1 A g-1, the anode material shows a high reversible capacity of 1232.9 mAh g-1 after 100 cycles. Even at a current density of 1 A g-1, it still achieves a high reversible capacity of 812.3 mAh g-1 after 200 cycles...
September 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28925684/carbon-nanotube-based-ion-selective-sensors-for-wearable-applications
#4
Soumyendu Roy, Moshe David-Pur, Yael Hanein
Wearable electronics offer new opportunities in a wide range of applications, especially sweat analysis using skin sensors. A fundamental challenge in these applications is the formation of sensitive and stable electrodes. In this article we report the development of a wearable sensor based on carbon nanotube (CNT) electrode arrays for sweat sensing. Solid-state ion selective electrodes (ISEs), sensitive to Na+ ions, were prepared by drop coating plasticized poly-vinyl chloride (PVC) doped with ionophore and ion exchanger on CNT electrodes...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28925265/janus-electrochemistry-asymmetric-functionalization-in-one-step
#5
David Ibañez, Elisa Vallés, Elvira Gómez, Alvaro Colina, Aranzazu Heras
Janus structures represent an overwhelming member of materials with adaptable chemical and physical properties. The development of new synthesis routes has allowed the fabrication of Janus architectures with specific characteristics depending on the final applications. In the case of the membranes, the improvement of wet routes has been limited to the capillary effect, in which the solution can gradually penetrate through the membrane avoiding a double modification, different at each face of the membrane. In this work, we propose a new electrochemical methodology to circumvent the capillary limitation and to obtain a double electrochemical functionalization in only one step in a controlled way...
September 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28924348/single-walled-carbon-nanotubes-ciprofloxacin-nanoantibiotic-strategy-to-improve-ciprofloxacin-antibacterial-activity
#6
Mohyeddin Assali, Abdel Naser Zaid, Farah Abdallah, Motasem Almasri, Rasha Khayyat
As infectious diseases continue to be one of the greatest health challenges worldwide, the demand toward alternative agents is continuously increasing. Recent advancement in nanotechnology has expanded our ability to design and construct nanomaterials to treat bacterial infections. Carbon nanotubes are one among these nanomaterials. Herein, we describe the covalent functionalization of the single-walled carbon nanotubes (SWCNTs) with multiple molecules of ciprofloxacin. The prepared nanoantibiotics were characterized using different techniques, including transmission electron microscopy, Raman spectroscopy, and thermogravimetric analysis...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28921945/multiwalled-carbon-nanotubes-dramatically-affect-the-fruit-metabolome-of-exposed-tomato-plants
#7
Diamond L McGehee, Mohamed H Lahiani, Fahmida Irin, Micah J Green, Mariya V Khodakovskaya
Here, we reported that multiwalled carbon nanotubes (MWCNT) added to hydroponics system can enhance fruit production of exposed tomato plants. We quantified the exact amount of MWCNT accumulated inside of fruits collected by MWCNT-exposed plants using an advanced microwave induced heating technique (MIH). We found that absorption of MWCNT by tomato fruits significantly affected total fruit metabolome as was confirmed by LC-MS. Our data highlight the importance of comprehensive toxicological risk assessment of plants contaminated with carbon nanomaterials...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28920434/ultralow-temperature-solution-processed-aluminum-oxide-dielectrics-via-local-structure-control-of-nanoclusters
#8
Jeong-Wan Jo, Yong-Hoon Kim, Joohyung Park, Jae Sang Heo, Seongpil Hwang, Won-June Lee, Myung-Han Yoon, Myung-Gil Kim, Sung Kyu Park
Oxide dielectric materials play a key role in a wide range of high-performance solid-state electronics from semiconductor devices to emerging wearable and soft bio-electronic devices. Although lots of previous advances are noteworthy, their typical processing temperature still far exceeds the thermal limitations of soft materials, impeding their wide utilization in these emerging fields. Here, we report an innovative route to form highly reliable aluminum-oxide dielectric films using an ultralow temperature (< 60 ˚C) solution process with a class of oxide nanocluster precursors...
September 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28919736/carbon-nanotubes-gathered-onto-silica-particles-lose-their-biomimetic-properties-with-the-cytoskeleton-becoming-biocompatible
#9
Elena González-Domínguez, Nerea Iturrioz-Rodríguez, Esperanza Padín-González, Juan Villegas, Lorena García-Hevia, Moisés Pérez-Lorenzo, Wolfgang J Parak, Miguel A Correa-Duarte, Mónica L Fanarraga
Carbon nanotubes (CNTs) are likely to transform the therapeutic and diagnostic fields in biomedicine during the coming years. However, the fragmented vision of their side effects and toxicity in humans has proscribed their use as nanomedicines. Most studies agree that biocompatibility depends on the state of aggregation/dispersion of CNTs under physiological conditions, but conclusions are confusing so far. This study designs an experimental setup to investigate the cytotoxic effect of individualized multiwalled CNTs compared to that of identical nanotubes assembled on submicrometric structures...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28918627/in-situ-neutron-depth-profiling-of-lithium-metal-garnet-interfaces-for-solid-state-batteries
#10
Chengwei Wang, Yunhui Gong, Jiaqi Dai, Lei Zhang, Hua Xie, Glenn Pastel, Boyang Liu, Eric Wachsman, Howard Wang, Liangbing Hu
The garnet-based solid state electrolyte (SSE) is considered a promising candidate to realize all solid state lithium (Li) metal batteries. However, critical issues require additional investigation before practical applications become possible, among which high interfacial impedance and low interfacial stability remain the most challenging. In this work, neutron depth profiling (NDP), a nondestructive and uniquely Li-sensitive technique, has been used to reveal the interfacial behavior of garnet SSE in contact with metallic Li through in situ monitoring of Li plating-stripping processes...
September 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28918373/defect-free-surface-modification-methods-for-solubility-tunable-carbon-nanotubes
#11
Hee Dae Lee, Byung Min Yoo, Tae Hoon Lee, Ho Bum Park
Although carbon nanotubes (CNTs) have outstanding physical properties, there are still challenging issues such as poor dispersibility and miscibility between organic polymers and CNTs for polymer nanocomposites. Chemical modifications (e.g., strong acid based oxidation, carboxylation, etc.) can improve dispersion properties and compatibility, but such surface modification methods often lead to damage to the pristine CNT structure and also deteriorate the mechanical properties of CNTs. Here we demonstrate a simple, defect-free and scalable method for well-dispersed CNTs in common organic solvents, using dopamine and amine-terminated polyethylene glycol derivatives...
September 8, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28917887/a-visible-and-controllable-porphyrin-poly-ethylene-glycol-%C3%AE-cyclodextrin-hydrogel-nanocomposites-system-for-photo-response
#12
Jie Liang, Xia Dong, Chang Wei, Guilei Ma, Tianjun Liu, Deling Kong, Feng Lv
The real-time controlling and tracking of the evolution and status of the hydrogel are important challenges for accurate and precise assessments. In this article, a visible and controllable hydrogel nanocomposites system for photo response was designed and developed based on a thermosensitive porphyrin-poly(ethylene glycol)/α-cyclodextrin hydrogel loaded with multi-walled carbon nanotubes (PPEG-MWNTs/α-CD). The PPEG-MWNTs/α-CD hydrogel was simply self-assembled with a carbon nanotubes dispersed porphyrin-poly(ethylene glycol) solution and an aqueous solution of α-cyclodextrin by homogeneous stirring...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917811/electrochemical-characterization-of-in-situ-functionalized-gold-organosulfur-self-assembled-monolayer-with-conducting-polymer-and-carbon-nanotubes-for-determination-of-rutin
#13
Majid Arvand, Mona Farahpour, Masoomeh Sayyar Ardaki
In this study, attempts were made to present a sensitive strategy for determining rutin. To reach the goal of the study, a poly(sulfosalicylic acid) film was electropolymerized on a gold electrode, which was modified by 2-mercaptobenzothiazole self-assembled monolayer and multi-walled carbon nanotubes (PSSA/CNTs/MBT/Au). The proposed sensor was characterized by different techniques including field emission scanning electron microscopy, energy dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917800/%C3%AE-cyclodextrins-incorporated-multi-walled-carbon-nanotubes-modified-electrode-for-the-voltammetric-determination-of-the-pesticide-dichlorophen
#14
Karolina Sipa, Mariola Brycht, Andrzej Leniart, Paweł Urbaniak, Agnieszka Nosal-Wiercińska, Bartłomiej Pałecz, Sławomira Skrzypek
In this work, a glassy carbon electrode modified with β-cyclodextrins and multi-walled carbon nanotubes (β-CDs/MWCNTs/GCE) was constructed and applied for the square-wave adsorptive stripping voltammetric (SWAdSV) determination of the pesticide dichlorophen (Dcp). For the first time, this compound was electrochemically investigated. The voltammetric measurements were conducted in phosphate buffer (PBS) at pH 6.5 as a supporting electrolyte, and SWAdSV technique parameters were optimized. A linear calibration curve in the wide concentration range from 5...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28917783/intellectual-modifying-a-bare-glassy-carbon-electrode-to-fabricate-a-novel-and-ultrasensitive-electrochemical-biosensor-application-to-determination-of-acrylamide-in-food-samples
#15
Kambiz Varmira, Omid Abdi, Mohammad-Bagher Gholivand, Hector C Goicoechea, Ali R Jalalvand
Acrylamide (AA) is a neurotoxin and carcinogen which is mainly formed in foods containing large quantities of starch processed at high temperatures and its determination is very important to control the quality of foods. In this work, a novel electrochemical biosensor based on hemoglobin-dimethyldioctadecylammonium bromide (HG-DDAB)/platinum-gold-palladium three metallic alloy nanoparticles (PtAuPd NPs)/chitosan-1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (Ch-IL)/multiwalled carbon nanotubes-IL (MWCNTs-IL)/glassy carbon electrode (GCE) is proposed for ultrasensitive determination of AA in food samples...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28916761/chronic-interfacing-with-the-autonomic-nervous-system-using-carbon-nanotube-cnt-yarn-electrodes
#16
Grant A McCallum, Xiaohong Sui, Chen Qiu, Joseph Marmerstein, Yang Zheng, Thomas E Eggers, Chuangang Hu, Liming Dai, Dominique M Durand
The ability to reliably and safely communicate chronically with small diameter (100-300 µm) autonomic nerves could have a significant impact in fundamental biomedical research and clinical applications. However, this ability has remained elusive with existing neural interface technologies. Here we show a new chronic nerve interface using highly flexible materials with axon-like dimensions. The interface was implemented with carbon nanotube (CNT) yarn electrodes to chronically record neural activity from two separate autonomic nerves: the glossopharyngeal and vagus nerves...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28915730/adsorption-and-diffusion-of-fluids-in-defective-carbon-nanotubes-insights-from-molecular-simulations
#17
Benjamin J Bucior, German V Kolmakov, JoAnna M Male, Jinchen Liu, De-Li Chen, Prashant Kumar, J Karl Johnson
Single-walled carbon nanotubes (SWNTs) have been shown from both simulations and experiments to have remarkably low resistance to gas and liquid transport. This has been attributed to the remarkably smooth interior surface of pristine SWNTs. However, real SWNTs are known to have various defects that depend on the synthesis method and procedure used to activate the SWNTs. In this paper we study adsorption and transport properties of atomic and molecular gases and fluids in SWNTs having vacancy point defects...
September 15, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28915486/ultrathin-beta-nickel-hydroxide-nanosheets-grown-along-multi-walled-carbon-nanotubes-a-novel-nanohybrid-for-enhancing-flame-retardancy-and-smoke-toxicity-suppression-of-unsaturated-polyester-resin
#18
Yun Hai, Saihua Jiang, Xiaodong Qian, Shuidong Zhang, Ping Sun, Bo Xie, Ningning Hong
Novel nanohybrid (β-Ni(OH)2-CNTs) obtained by ultrathin Beta-Nickel hydroxide (β-Ni(OH)2) nanosheets grown along multi-walled carbon nanotubes (CNTs) was successfully synthesized and then incorporated into UPR to prepare UPR/β-Ni(OH)2-CNTs nanocomposites. Structure of β-Ni(OH)2-CNTs nanohybrid was confirmed by X-ray diffraction, scanning electron microscopy measurements. Compared with single CNTs or β-Ni(OH)2, the dispersion of β-Ni(OH)2-CNTs in UPR was improved greatly. And the UPR/β-Ni(OH)2-CNTs nanocomposites exhibited significant improvements in flame retardancy, smoke suppression, and mechanical properties, including decreased peak heat release rate by 39...
September 7, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28915482/nickel-nanoparticles-encapsulated-in-porous-carbon-and-carbon-nanotube-hybrids-from-bimetallic-metal-organic-frameworks-for-highly-efficient-adsorption-of-dyes
#19
Lina Jin, Xiaoshuang Zhao, Xinye Qian, Mingdong Dong
Nickel nanoparticles encapsulated in porous carbon/carbon nanotube hybrids (Ni/PC-CNT) were successfully prepared by a facile carbonization process using Ni/Zn-MOF as the precursor. Distinct from previous studies, Ni/Zn-MOF precursors were prepared via a direct precipitation method at room temperature for only 5min. After the carbonization, magnetic Ni nanoparticles were well embedded in the porous carbon and carbon nanotube. The obtained Ni/PC-CNT composites had a high surface area (999m(2) g(-1)), large pore volume (0...
September 6, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28915042/mode-of-peg-coverage-on-carbon-nanotubes-affects-binding-of-innate-immune-protein-c1q
#20
Agathe Belime, Edmond Gravel, Sophie Brenet, Sarah Ancelet, Charlotte Caneiro, Yanxia Hou, Nicole Thielens, Eric Doris, Wai Li Ling
Surface modification of nanoparticles with poly(ethylene glycol) PEG is used in biomedicines to increase the circulation time of the particles after intravenous injection. Here, we study the interaction of PEG-covered carbon nanotubes (CNTs) with the serum complement protein C1q. Besides being the target-recognizing unit of the initiating complex for the classical pathway of complement in our innate immune system, C1q is involved in a range of important physiological processes. We modified the surface of multi-walled CNTs with covalently grafted PEG and physically adsorbed PEG...
September 15, 2017: Journal of Physical Chemistry. B
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