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https://www.readbyqxmd.com/read/28213260/the-fabrication-of-carbon-nanotubes-array-based-electrochemical-chiral-sensor-by-electrosynthesis
#1
Hong Zhu, Fengxia Chang, Zhiwei Zhu
How to align the single-walled carbon nanotubes (SWCNTs) onto the electrode vertically and to control their density and orientation are still a major challenge. Theoretically, properly selected chiral SWCNTs can discriminate enantiomers through their different dielectric response to the adsorption of chiral species, few reports can confirm this theoretic model. Herein, we presented a new strategy to fabricate SWCNTs array-based electrochemical chiral sensor. Carboxylated chiral SWCNTs were vertically attached to the oxidized glass carbon electrode with ethylenediamine as a linker by electrosynthesis...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213255/amperometric-flow-injection-analysis-of-glucose-using-immobilized-glucose-oxidase-on-nano-composite-carbon-nanotubes-platinum-nanoparticles-carbon-paste-electrode
#2
Maliwan Amatatongchai, Wongduan Sroysee, Sanoe Chairam, Duangjai Nacapricha
We report a novel amperometric glucose biosensor based on glucose oxidase (GOx) immobilized on a carbon nanotube (CNTs)-poly(diallyldimethyl-ammonium chloride) (PDDA)-platinum nanoparticle (PtNPs) modified carbon-paste electrode (CNTs-PDDA-PtNPs/CPE). The CNTs-PDDA-PtNPs composite materials were characterized by TEM and electrochemical techniques. Cyclic voltammetric results reveal direct electron transfer of the immobilized GOx, indicated by two quasi-reversible redox peaks at a potential of 0.37V (vs. Ag/AgCl) in phosphate buffered solution (PBS) (0...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213234/dna-wrapped-multi-walled-carbon-nanotube-modified-electrochemical-biosensor-for-the-detection-of-escherichia-coli-from-real-samples
#3
Dilsat Ozkan-Ariksoysal, Yasin Ugur Kayran, Fethiye Ferda Yilmaz, Anton Alexandru Ciucu, Iulia Gabriela David, Vasile David, Mine Hosgor-Limoncu, Mehmet Ozsoz
This paper introduces DNA-wrapped multi-walled carbon nanotube (MWCNT)-modified genosensor for the detection of Escherichia coli (E. coli) from polymerase chain reaction (PCR)-amplified real samples while Staphylococcus aureus (S. aureus) was used to investigate the selectivity of the biosensor. The capture probe specifically recognizing E. coli DNA and it was firstly interacted with MWCNTs for wrapping of single-stranded DNA (ssDNA) onto the nanomaterial. DNA-wrapped MWCNTs were then immobilised on the surface of disposable pencil graphite electrode (PGE) for the detection of DNA hybridization...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28213221/a-novel-fluorescent-aptasensor-for-ultrasensitive-detection-of-microcystin-lr-based-on-single-walled-carbon-nanotubes-and-dapoxyl
#4
Seyed Mohammad Taghdisi, Noor Mohammad Danesh, Mohammad Ramezani, Narjes Ghows, Seyed Ali Mousavi Shaegh, Khalil Abnous
To assure water safety and protect human health, precise and simple analytical approaches are highly desired to determine low concentrations of microcystin-leucine-arginine (MC-LR), a toxin, in both water and serum samples. Herein, a simple, rapid and accurate aptamer-based fluorescent sensor was used for selective recognition of MC-LR, based on single-walled carbon nanotubes (SWNTs) as immobilizers, dapoxyl as a fluorescent dye, DAP-10 as a specific aptamer for dapoxyl and unmodified MC-LR aptamer (Apt) as a sensing ligand...
May 1, 2017: Talanta
https://www.readbyqxmd.com/read/28212488/graphene-oxide-glue-electrode-for-fabrication-of-vertical-elastic-conductive-columns
#5
Liusi Yang, Mingchu Zou, Shiting Wu, Wenjing Xu, Huaisheng Wu, Anyuan Cao
Graphene has a planar atomic structure with high flexibility, and might be used as ultra-thin conductive glues or adhesion layers in electronics and other applications. Here, we show that graphene oxide (GO) sheets condensed from solution can act as a pure, thin-layer, non-penetrating glue for fabrication of vertical architectures anchored on rigid and flexible substrates. Carbon nanotube (CNT) sponges are used as a porous template to make polymer-reinforced composite columns, to achieve both high conductivity and elastic behavior...
February 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28212271/carbon-nanotubes-as-an-effective-opportunity-for-cancer-diagnosis-and-treatment
#6
REVIEW
Alessandro Sanginario, Beatrice Miccoli, Danilo Demarchi
Despite the current progresses of modern medicine, the resistance of malignant tumors to present medical treatments points to the necessity of developing new therapeutic approaches. In recent years, numerous studies have focused their attention on the promising use of nanomaterials, like iron oxide nanowires, zinc oxide or mesoporous silica nanoparticles, for cancer and metastasis treatment with the advantage of operating directly at the bio-molecular scale. Among them, carbon nanotubes emerged as valid candidates not only for drug delivery, but also as a valuable tool in cancer imaging and physical ablation...
February 15, 2017: Biosensors
https://www.readbyqxmd.com/read/28212000/radiation-hard-complementary-integrated-circuits-based-on-semiconducting-single-walled-carbon-nanotubes
#7
Julian J McMorrow, Cory D Cress, William A Gaviria Rojas, Michael L Geier, Tobin J Marks, Mark C Hersam
Increasingly complex demonstrations of integrated circuit elements based on semiconducting single-walled carbon nanotubes (SWCNTs) mark the maturation of this technology for use in next-generation electronics. In particular, organic materials have recently been leveraged as dopant and encapsulation layers to enable stable SWCNT-based rail-to-rail, low-power complementary metal-oxide-semiconductor (CMOS) logic circuits. To explore the limits of this technology in extreme environments, here we study total ionizing dose (TID) effects in enhancement-mode SWCNT-CMOS inverters that employ organic doping and encapsulation layers...
February 17, 2017: ACS Nano
https://www.readbyqxmd.com/read/28211793/a-novel-field-emission-microscopy-method-to-study-field-emission-characteristics-of-freestanding-carbon-nanotube-array
#8
Yunhan Li, Yonghai Sun, David Jaffray, John T W Yeow
Field emission (FE) uniformity and mechanism of emitter failure of freestanding carbon nanotube (CNT) arrays have not been well studied due to the difficulty of observing and quantifying FE performance of each emitter in CNT arrays. Herein a field emission microscopy (FEM) method based on Poly(methyl methacrylate) (PMMA) thin film is proposed to study the FE uniformity and CNT emitter failure of freestanding CNT arrays. FE uniformity of freestanding CNT arrays and different levels of FE current contributions from each emitter in the arrays are recorded and visualized...
February 17, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28211526/stable-optical-trapping-and-sensitive-characterization-of-nanostructures-using-standing-wave-raman-tweezers
#9
Mu-Ying Wu, Dong-Xiong Ling, Lin Ling, William Li, Yong-Qing Li
Optical manipulation and label-free characterization of nanoscale structures open up new possibilities for assembly and control of nanodevices and biomolecules. Optical tweezers integrated with Raman spectroscopy allows analyzing a single trapped particle, but is generally less effective for individual nanoparticles. The main challenge is the weak gradient force on nanoparticles that is insufficient to overcome the destabilizing effect of scattering force and Brownian motion. Here, we present standing-wave Raman tweezers for stable trapping and sensitive characterization of single isolated nanostructures with a low laser power by combining a standing-wave optical trap with confocal Raman spectroscopy...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211468/long-lasting-solid-lubrication-by-cnt-coated-patterned-surfaces
#10
L Reinert, F Lasserre, C Gachot, P Grützmacher, T MacLucas, N Souza, F Mücklich, S Suarez
The use of lubricants (solid or liquid) is a well-known and suitable approach to reduce friction and wear of moving machine components. Another possibility to influence the tribological behaviour is the formation of well-defined surface topographies such as dimples, bumps or lattice-like pattern geometries by laser surface texturing. However, both methods are limited in their effect: surface textures may be gradually destroyed by plastic deformation and lubricants may be removed from the contact area, therefore no longer properly protecting the contacting surfaces...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28211337/enhanced-electrochemical-degradation-of-ibuprofen-in-aqueous-solution-by-ptru-alloy-catalyst
#11
Chiung-Fen Chang, Tsan-Yao Chen, Ching-Ju Monica Chin, Yu-Tsun Kuo
Electrochemical advanced oxidation processes (EAOPs) regarded as a green technology for aqueous ibuprofen treatment was investigated in this study. Multi-walled carbon nanotubes (MWCNTs), Pt nanoparticles (Pt NPs), and PtRu alloy, of which physicochemical properties were characterized by XRD and X-ray absorption spectroscopy, were used to synthesize three types of cheap and effective anodes based on commercial conductive glass. Furthermore, the operating parameters, such as the current densities, initial concentrations, and solution pH were also investigated...
February 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/28209031/carbon-nanomaterial-formation-on-fresh-reduced-iron-by-converted-natural-gas
#12
A Nebesnyi, V Kotov, A Sviatenko, D Filonenko, A Khovavko, B Bondarenko
The mechanism of carbon nanomaterial formation at moderate temperatures while processing fresh-reduced iron by products of air conversion of natural gas is considered. It is shown that under given conditions, the size and the shape of the resulting carbon are dependent on the temperature and the size of microscopic iron grains formed during reduction. These iron grains are the catalyzer of the reaction of carbon monoxide disproportionation. It is concluded that the formation of a nucleus of the new carbon phase occurs at the contact boundaries of neighboring grains of newly reduced iron with the subsequent formation in these places of ring-shaped carbon cuffs...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28208276/single-drop-solution-electrode-discharge-induced-cold-vapor-generation-coupling-to-matrix-solid-phase-dispersion-a-robust-approach-for-sensitive-quantification-of-total-mercury-distribution-in-fish
#13
Qian Chen, Yao Lin, Yunfei Tian, Li Wu, Lu Yang, Xiandeng Hou, Chengbin Zheng
Sensitive quantification of mercury distribution in fish is challenging because of insufficient sensitivities of conventional analytical methods, the limited mass of organs (tens of micrograms to several milligrams), and dilution of analyte concentration from sample digestion. In this work, a simple and robust approach coupling multiwall carbon nanotubes assisted matrix solid-phase dispersion (MWCNTs-MSPD) to single-drop solution electrode glow discharge-induced cold vapor generation (SD-SEGD-CVG) was developed for the sensitive determination of mercury in limited amount of sample...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208253/engineering-carbon-nanotube-fiber-for-real-time-quantification-of-ascorbic-acid-levels-in-a-live-rat-model-of-alzheimer-s-disease
#14
Limin Zhang, Fangling Liu, Xuemei Sun, Guang-Feng Wei, Yang Tian, Zhi-Pan Liu, Rong Huang, Yanyan Yu, Huisheng Peng
Ascorbic acid (AA) levels are closely correlated with physiological and pathological events in brain diseases, but the mechanism remains unclear, mainly due to the difficulty of accurately analyzing AA levels in live brain. In this study, by engineering tunable defects and oxygen-containing species in carbon nanotubes, a novel aligned carbon nanotube fiber was developed as an accurate microsensor for the ratiometric detection of AA levels in live rat brains with Alzheimer's disease (AD). AA oxidation is greatly facilitated on the fiber surface at a low potential, leading to high sensitivity as well as high selectivity against potential sources of interference in the brain...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208243/direct-determination-of-ascorbic-acid-in-a-grapefruit-paving-the-way-for-in-vivo-spectroelectrochemistry
#15
Jesus Garoz-Ruiz, Aranzazu Heras, Alvaro Colina
The study of real samples is more complicated than the study of other systems. However, the inherent advantages of UV-vis absorption spectroelectrochemistry should overcome some difficulties related to direct measurements in complex matrices. For this reason, a singular spectroelectrochemistry device has been fabricated and validated. The novel cell is based on single-walled carbon nanotubes, which are filtered and subsequently press-transferred on a polyethylene terephthalate support using a stencil with a custom design...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28207255/supramolecular-complexation-of-carbon-nanostructures-by-crown-ethers
#16
Luis Moreira, Beatriz M Illescas, Nazario Martín
Since its discovery, crown ethers as well as the most recent carbon nanostructures, namely fullerenes, carbon nanotubes and graphene, have received a lot of attention from the chemical community. As a proof, these innovative chemical structures have gathered three Nobel Prizes in 1987, 1996 and 2010 corresponding to crown ethers, fullerenes and graphene, respectively. Merging these singular chemical structures has provided a wealth number of unprecedented supramolecular assemblies with new geometrical and electronic properties whose more representative examples have been presented in this synopsis organized according to the different nature of the carbon nanostructures...
February 16, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28206878/use-of-carbon-nanotubes-for-the-analysis-of-pesticide-residues-in-fruits-and-vegetables
#17
Lukman Bola Abdulrauf, Guan Huat Tan
This review presents the application of carbon nanotubes as sorbent materials in the analysis of pesticide residues in fruits and vegetables. The advantages, limitations, and challenges of carbon nanotubes, with respect to their use in analytical chemistry, are presented. The efficiency of their application as extraction sorbent materials (in terms of LOD, LOQ, linearity, relative recovery, and RSD) in SPE, solid-phase microextraction, multi-plug filtration clean-up, matrix solid-phase dispersion, and the quick, easy, cheap, effective, rugged and safe method is reported...
November 1, 2016: Journal of AOAC International
https://www.readbyqxmd.com/read/28204854/adsorption-of-dna-binding-proteins-to-functionalized-carbon-nanotube-surfaces-with-and-without-dna-wrapping
#18
Yu Ishibashi, Shusuke Oura, Kazuo Umemura
We examined the adsorption of DNA binding proteins on functionalized, single-walled carbon nanotubes (SWNTs). When SWNTs were functionalized with polyethylene glycol (PEG-SWNT), moderate adsorption of protein molecules was observed. In contrast, nanotubes functionalized with CONH2 groups (CONH2-SWNT) exhibited very strong interactions between the CONH2-SWNT and DNA binding proteins. Instead, when these SWNT surfaces were wrapped with DNA molecules (thymine 30-mers), protein binding was a little decreased. Our results revealed that DNA wrapped PEG-SWNT was one of the most promising candidates to realize DNA nanodevices involving protein reactions on DNA-SWNT surfaces...
February 15, 2017: European Biophysics Journal: EBJ
https://www.readbyqxmd.com/read/28203074/temperature-and-ph-sensitive-wearable-materials-for-monitoring-foot-ulcers
#19
Pietro Salvo, Nicola Calisi, Bernardo Melai, Valentina Dini, Clara Paoletti, Tommaso Lomonaco, Andrea Pucci, Fabio Di Francesco, Alberto Piaggesi, Marco Romanelli
Foot ulcers account for 15% of comorbidities associated with diabetes. Presently, no device allows the status of foot ulcers to be continuously monitored when patients are not hospitalized. In this study, we describe a temperature and a pH sensor capable of monitoring diabetic foot and venous leg ulcers developed in the frame of the seventh framework program European Union project SWAN-iCare (smart wearable and autonomous negative pressure device for wound monitoring and therapy). Temperature is measured by exploiting the variations in the electrical resistance of a nanocomposite consisting of multiwalled carbon nanotubes and poly(styrene-b-(ethylene-co-butylene)-b-styrene)...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/28202237/bound-and-unbound-humic-acids-perform-different-roles-in-the-aggregation-and-deposition-of-multi-walled-carbon-nanotubes
#20
Xuezhi Yang, Qi Wang, Xiaolei Qu, Wei Jiang
Natural organic matter influences the carbon nanotube transport in aqueous environments. The role of bound humic acid (HA) on carbon nanotubes and unbound HA in bulk solution in the aggregation and deposition of carboxylated multi-walled carbon nanotubes (C-MWNTs) was examined in NaCl and CaCl2 electrolyte solution. Time-resolved dynamic light scattering and quartz crystal microbalance with dissipation monitoring were employed to investigate the C-MWNT aggregation and deposition kinetics, respectively. The critical coagulation concentration (CCC) of C-MWNTs is 30mM in NaCl and 3mM in CaCl2...
February 12, 2017: Science of the Total Environment
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