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https://www.readbyqxmd.com/read/28813013/recent-advances-in-electrospun-nanofiber-interfaces-for-biosensing-devices
#1
REVIEW
Eleni Sapountzi, Mohamed Braiek, Jean-François Chateaux, Nicole Jaffrezic-Renault, Florence Lagarde
Electrospinning has emerged as a very powerful method combining efficiency, versatility and low cost to elaborate scalable ordered and complex nanofibrous assemblies from a rich variety of polymers. Electrospun nanofibers have demonstrated high potential for a wide spectrum of applications, including drug delivery, tissue engineering, energy conversion and storage, or physical and chemical sensors. The number of works related to biosensing devices integrating electrospun nanofibers has also increased substantially over the last decade...
August 16, 2017: Sensors
https://www.readbyqxmd.com/read/28812987/a-microneedle-functionalized-with-polyethyleneimine-and-nanotubes-for-highly-sensitive-label-free-quantification-of-dna
#2
Darius Saadat-Moghaddam, Jong-Hoon Kim
The accurate measure of DNA concentration is necessary for many DNA-based biological applications. However, the current methods are limited in terms of sensitivity, reproducibility, human error, and contamination. Here, we present a microneedle functionalized with polyethyleneimine (PEI) and single-walled carbon nanotubes (SWCNTs) for the highly sensitive quantification of DNA. The microneedle was fabricated using ultraviolet (UV) lithography and anisotropic etching, and then functionalized with PEI and SWCNTs through a dip coating process...
August 16, 2017: Sensors
https://www.readbyqxmd.com/read/28812081/solvent-basicity-promotes-the-hydride-mediated-electron-transfer-doping-of-carbon-nanotubes
#3
Yoshiyuki Nonoguchi, Shunsuke Sudo, Atsushi Tani, Tomoko Murayama, Yuriko Nishiyama, Ryoko M Uda, Tsuyoshi Kawai
This study investigates the hydride-mediated electron transfer doping of single-walled carbon nanotubes using absorption spectroscopy and thermoelectric measurements. Specific solvent basicity is found to be important for the efficient n-type doping of carbon nanotubes. This progress is an essential requirement for the future development of electronic and energy devices.
August 16, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28810684/a-new-approach-combining-analytical-methods-for-workplace-exposure-assessment-of-inhalable-multi-walled-carbon-nanotubes
#4
Peter C Tromp, Eelco Kuijpers, Cindy Bekker, Lode Godderis, Qing Lan, Aleksandra D Jedynska, Roel Vermeulen, Anjoeka Pronk
To date there is no consensus about the most appropriate analytical method for measuring carbon nanotubes (CNTs), hampering the assessment and limiting the comparison of data. The goal of this study is to develop an approach for the assessment of the level and nature of inhalable multi-wall CNTs (MWCNTs) in an actual workplace setting by optimizing and evaluating existing analytical methods. In a company commercially producing MWCNTs, personal breathing zone samples were collected for the inhalable size fraction with IOM samplers; which were analyzed with carbon analysis, inductively coupled plasma mass spectrometry (ICP-MS) and scanning electron microscopy/energy dispersive X-ray spectroscopy (SEM/EDX)...
August 1, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/28809537/confined-water-structure-dynamics-and-thermodynamics
#5
Sudip Chakraborty, Hemant Kumar, Chandan Dasgupta, Prabal K Maiti
Understanding the properties of strongly confined water is important for a variety of applications such as fast flow and desalination devices, voltage generation, flow sensing, and nanofluidics. Confined water also plays an important role in many biological processes such as flow through ion channels. Water in the bulk exhibits many unusual properties that arise primarily from the presence of a network of hydrogen bonds. Strong confinement in structures such as carbon nanotubes (CNTs) substantially modifies the structural, thermodynamic, and dynamic (both translational and orientational) properties of water by changing the structure of the hydrogen bond network...
August 15, 2017: Accounts of Chemical Research
https://www.readbyqxmd.com/read/28809531/highly-efficient-method-for-the-synthesis-of-activated-mesoporous-biocarbons-with-extremely-high-surface-area-for-high-pressure-co2-adsorption
#6
Gurwinder Singh, Kripal Singh Lakhi, In Young Kim, Sungho Kim, Prashant Srivastava, Ravi Naidu, Ajayan Vinu
A simple and efficient way to synthesize activated mesoporous biocarbons (AMBs) with extremely high BET surface area and large pore volume has been achieved for the first time through a simple solid state activation of freely available biomass, Arundo donax, with zinc chloride. The textural parameters of the AMB can easily be controlled by varying the activation temperature. It is demonstrated that the mesoporosity of AMB can be finely tuned with a simple adjustment of the amount of activating agent. AMB with almost 100% mesoporosity can be achieved using the activating agent and the biomass ratio of 5 and carbonization at 500 °C...
August 15, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28809428/a-critical-role-of-catalyst-morphology-in-low-temperature-synthesis-of-carbon-nanotube-transition-metal-oxide-nanocomposite
#7
Xiaoyan Jin, Joohyun Lim, Yoonhoo Ha, Nam Hee Kwon, Hyeyoung Shin, In Young Kim, Nam-Suk Lee, Myung Hwa Kim, Hyungjun Kim, Seong-Ju Hwang
The effect of the catalyst morphology on the growth of carbon nanotubes (CNT) on nanostructured transition metal oxides was investigated to study a novel low-temperature synthetic route to functional CNT-transition metal oxide nanocomposites. Among several nanostructured manganese oxides with various morphologies and structures, only exfoliated 2D nanosheets of layered MnO2 acted as an effective catalyst for the chemical vapor deposition of CNT at low temperatures of 400-500 °C, which emphasizes the critical role of the catalyst morphology in CNT growth...
August 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/28809414/carrier-photogeneration-drift-and-recombination-in-a-semiconducting-carbon-nanotube-network
#8
A Eckstein, V Bertašius, V Jašinskas, I Namal, T Hertel, V Gulbinas
Charge carrier photogeneration, drift and recombination in thin film networks of polymer-wrapped (6,5)-single-wall carbon nanotubes (SWNTs) blended with phenyl-C61-butyric acid methyl ester (PCBM) have been investigated by using transient photocurrent and time-delayed collection field (TDCF) techniques. Three distinct transient photocurrent components on the nano- and microsecond timescales have been identified. We attribute the dominant (>50% of total extracted charge) ultrashort photocurrent component with a decay time below our experimental time-resolution of 2 ns to the intratube hole motion...
August 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/28808941/review-of-electronics-based-on-single-walled-carbon-nanotubes
#9
REVIEW
Yu Cao, Sen Cong, Xuan Cao, Fanqi Wu, Qingzhou Liu, Moh R Amer, Chongwu Zhou
Single-walled carbon nanotubes (SWNTs) are extremely promising materials for building next-generation electronics due to their unique physical and electronic properties. In this article, we will review the research efforts and achievements of SWNTs in three electronic fields, namely analog radio-frequency electronics, digital electronics, and macroelectronics. In each SWNT-based electronic field, we will present the major challenges, the evolutions of the methods to overcome these challenges, and the state-of-the-art of the achievements...
August 14, 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/28808710/interface-nanoparticle-control-of-a-nanometer-water-pump
#10
Jiaye Su, Yunzhen Zhao, Chang Fang, Syed Bilal Ahmed, Yue Shi
Nanoparticles are highly versatile and exhibit broad applications in tuning material properties. Herein, we show through molecular dynamics simulations the possibility of a nanometer water pump, driven by the motion of nanoparticles (NPs) on a membrane surface. Surprisingly, considerable net water flux can be induced through a carbon nanotube (CNT) that is perpendicular to the NP motion. The water transport can occur in a highly controllable fashion, not only by using a single NP with different forces, but also by varying the CNT length or the NP number...
August 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28808341/tuning-the-fermi-velocity-in-dirac-materials-with-an-electric-field
#11
A Díaz-Fernández, Leonor Chico, J W González, F Domínguez-Adame
Dirac materials are characterized by energy-momentum relations that resemble those of relativistic massless particles. Commonly denominated Dirac cones, these dispersion relations are considered to be their essential feature. These materials comprise quite diverse examples, such as graphene and topological insulators. Band-engineering techniques should aim to a full control of the parameter that characterizes the Dirac cones: the Fermi velocity. We propose a general mechanism that enables the fine-tuning of the Fermi velocity in Dirac materials in a readily accessible way for experiments...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28807745/acute-toxicity-of-functionalized-single-wall-carbon-nanotubes-a-biochemical-histopathologic-and-proteomics-approach
#12
Homa Ahmadi, Mohammad Ramezani, Rezvan Yazdian Robati, Behzad Behnam, Kamal Razavi Azarkhiavi, Azadeh Hashem Nia, Ahad Mokhtarzadeh, Maryam Matbou Riahi, Bibi Marjan Razavi, Khalil Abnous
Recently carbon nanotubes (CNTs) showed promising potentials in different biomedical applications but their safe use in humans and probable toxicities are still challenging. The aim of this study was to determine the acute toxicity of functionalized single walled carbon nanotubes (SWCNTs). In this project, PEGylated and Tween functionalized SWCNTs were prepared. BALB/c mice were randomly divided into nine groups, including PEGylated SWCNTs (75,150μg/mouse) and PEG, Tween80 suspended SWCNTs, Tween 80 and a control group (intact mice)...
August 11, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28806668/combination-of-electrochemical-biosensor-and-textile-threads-a-microfluidic-device-for-phenol-determination-in-tap-water
#13
F R Caetano, E A Carneiro, D Agustini, L C S Figueiredo-Filho, C E Banks, M F Bergamini, L H Marcolino-Junior
Microfluidic devices constructed using low cost materials presents as alternative for conventional flow analysis systems because they provide advantages as low consumption of reagents and samples, high speed of analysis, possibility of portability and the easiness of construction and maintenance. Herein, is described for the first time the use of an electrochemical biosensor for phenol detection combined with a very simple and efficient microfluidic device based on commercial textile threads. Taking advantages of capillary phenomena and gravity forces, the solution transportation is promoted without any external forces or injection pump...
July 29, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28806524/assessment-of-effects-of-the-long-term-exposure-of-agricultural-crops-to-carbon-nanotubes
#14
Mohamed Hassen Lahiani, Zeid A Nima, Hector Villagarcia, Alexandru S Biris, Mariya Khodakovskaya
Carbon-based nanomaterials (CBNs) were described as nanomaterials possessing abilities of plant growth regulators. Here, we investigated the effects of long-term exposure of multi-walled carbon nanotubes (MWCNTs) on the growth of three important crops (barley, soybean, corn). The cultivation of all tested species was carried in hydroponics supplemented with 50µg/ml of MWCNTs. After 20 weeks of continuous exposure to the nanomaterials, no significant toxic signs on plant development were observed. Several positive phenotypical changes were recorded in addition to the enhancement of photosynthesis in MWCNTs-exposed crops...
August 14, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28806069/oxidation-kinetics-of-bromophenols-by-nonradical-activation-of-peroxydisulfate-in-the-presence-of-carbon-nanotube-and-formation-of-brominated-polymeric-products
#15
Chao-Ting Guan, Jin Jiang, Cong-Wei Luo, Jun Ma, Su-Yan Pang, Yang Zhou, Yi Yang
This work demonstrated that bromophenols (BrPs) could be readily oxidized by peroxydisulfate (PDS) activated by a commercial carbon nanotube (CNT), while furfuryl alcohol (a chemical probe for singlet oxygen (1O2)) was quite refractory. Results obtained by radical quenching experiments, electron paramagnetic resonance spectroscopy, and Fourier transform infrared spectroscopy further confirmed the involvement of nonradical PDS-CNT complexes rather than 1O2. Bicarbonate and chloride ion exhibited negligible impacts on BrPs degradation by the PDS/CNT system, while a significant inhibitory effect was observed for natural organic matter...
August 14, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28805728/nano-charged-polypropylene-application-realistic-perspectives-for-enhancing-durability
#16
Carlo Naddeo, Luigi Vertuccio, Giuseppina Barra, Liberata Guadagno
Isotactic polypropylene/multi-walled carbon nanotube (iPP/MWCNTs) films have been exposed to accelerated weathering in a UV device for increasing times. The effect of UV irradiation on the structural and chemical changes has been investigated. The resistance to accelerated photooxidation of (iPP/MWCNTs) films has been compared to the photooxidation behaviour of unfilled polypropylene films with the same structural organization. The chemical and structural modifications resulting from photooxidation have been followed using infrared spectroscopy, calorimetric and diffractometric analysis...
August 14, 2017: Materials
https://www.readbyqxmd.com/read/28805223/the-effect-of-defects-on-the-catalytic-activity-of-single-au-atom-supported-carbon-nanotubes-and-reaction-mechanism-for-co-oxidation
#17
Sajjad Ali, Tian Fu Liu, Zan Lian, Bo Li, Dang Sheng Su
The mechanism of CO oxidation by O2 on a single Au atom supported on pristine, mono atom vacancy (m), di atom vacancy (di) and the Stone Wales defect (SW) on single walled carbon nanotube (SWCNT) surface is systematically investigated theoretically using density functional theory. We determine that single Au atoms can be trapped effectively by the defects on SWCNTs. The defects on SWCNTs can enhance both the binding strength and catalytic activity of the supported single Au atom. Fundamental aspects such as adsorption energy and charge transfer are elucidated to analyze the adsorption properties of CO and O2 and co-adsorption of CO and O2 molecules...
August 14, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28805213/oxalate-assisted-formation-of-uniform-carbon-confined-sno2-nanotubes-with-enhanced-lithium-storage
#18
Chunhua Han, Baoxuan Zhang, Kangning Zhao, Jiashen Meng, Qiu He, Pan He, Wei Yang, Qi Li, Liqiang Mai
SnO2 nanotubes are synthesized via an oxalate-assisted "redox etching and precipitating" route between MnOOH nanowires and Sn(2+) ions. The addition of oxalate is found to be crucial to guide the formation of uniform SnO2 nanotubes. To further improve the conductivity and stability, the as-obtained SnO2 nanotubes are coated with a thin carbon layer. The resulting carbon-confined SnO2 nanotubes possess superior rate performance as an anode material for lithium-ion batteries.
August 14, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28804961/gaseous-nanocarving-mediated-carbon-framework-with-spontaneous-metal-assembly-for-structure-tunable-metal-carbon-nanofibers
#19
Dae-Hyun Nam, Sungwoo Lee, Young-Joo Lee, Jun-Hyun Jo, Euijoon Yoon, Kyung-Woo Yi, Gun-Do Lee, Young-Chang Joo
Vapor phase carbon (C)-reduction-based syntheses of C nanotubes and graphene, which are highly functional solid C nanomaterials, have received extensive attention in the field of materials science. This study suggests a revolutionary method for precisely controlling the C structures by oxidizing solid C nanomaterials into gaseous products in the opposite manner of the conventional approach. This gaseous nanocarving enables the modulation of inherent metal assembly in metal/C hybrid nanomaterials because of the promoted C oxidation at the metal/C interface, which produces inner pores inside C nanomaterials...
August 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28803544/overcoming-qrt-pcr-interference-by-select-carbon-nanotubes-in-assessments-of-gene-expression
#20
Sara T Humes, Shannon Hentschel, Candice M Lavelle, L Cody Smith, John A Lednicky, Navid B Saleh, Tara Sabo-Attwood
Nanomaterials (NMs) of various types, including carbon nanotubes (CNTs), can interfere with standard quantitative real-time PCR (qRT-PCR) assays, resulting in inaccurate gene expression measurements; however, the precise step in the qRT-PCR pipeline where this interference occurs has not been well described. Here, we investigated where in the process surface-oxidized multi-walled CNTs (oxMWNTs) inhibited qRT-PCR measurement of the expression of the housekeeping gene GAPDH and explored several strategies to minimize such inhibition...
August 1, 2017: BioTechniques
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