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https://www.readbyqxmd.com/read/28527531/titanium-dioxide-nanotubes-addition-to-self-adhesive-resin-cement-effect-on-physical-and-biological-properties
#1
Carla M Ramos-Tonello, Paulo N Lisboa-Filho, Larisa B Arruda, Cintia K Tokuhara, Rodrigo C Oliveira, Adilson Y Furuse, José H Rubo, Ana Flávia S Borges
OBJECTIVES: This study has investigated the influence of Titanium dioxide nanotubes (TiO2-nt) addition to self-adhesive resin cement on the degree of conversion, water sorption, and water solubility, mechanical and biological properties. METHODS: A commercially available auto-adhesive resin cement (RelyX U200™, 3M ESPE) was reinforced with varying amounts of nanotubes (0.3, 0.6, 0.9wt%) and evaluated at different curing modes (self- and dual cure). The DC in different times (3, 6, 9, 12 and 15min), water sorption (Ws) and solubility (Sl), 3-point flexural strength (σf), elastic modulus (E), Knoop microhardness (H) and viability of NIH/3T3 fibroblasts were performed to characterize the resin cement...
May 17, 2017: Dental Materials: Official Publication of the Academy of Dental Materials
https://www.readbyqxmd.com/read/28527356/exceptional-release-kinetics-and-cytotoxic-selectivity-of-oxidised-mwcnts-double-functionalised-with-doxorubicin-and-prostate-homing-peptide
#2
Vedran Milosavljevic, Ludmila Krejcova, Roman Guran, Hana Buchtelova, Dorota Wawrzak, Lukas Richtera, Zbynek Heger, Pavel Kopel, Vojtech Adam
Multiwall carbon nanotubes (MWCNTs) are among the frequently studied carbon materials, particularly because of their physical and chemical properties and high potential for application in materials chemistry, industry, and medicine. MWCNTs are very promising as transporters of bioactive molecules because of their π electrons and large surface area, which can be easily modified, mostly by the application of inorganic acids for the introduction of carboxylic moieties on the surface. In the present study, we designed an oxidised MWCNTs (oMWCNTs) transporter for the targeted delivery of doxorubicin (Dox)...
May 3, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28525853/photoelectrochemical-sensitive-detection-of-insulin-based-on-cds-polydopamine-co-sensitized-wo3-nanorod-and-signal-amplification-of-carbon-nanotubes-polydopamine
#3
Rongyu Wang, Hongmin Ma, Yong Zhang, Qi Wang, Zhongping Yang, Bin Du, Dan Wu, Qin Wei
An ultrasensitive photoelectrochemical sandwich immunosensor was designed for detection of insulin based on WO3/CdS/polydopamine (WO3/CdS/PDA) co-sensitized and PDA@carbon nanotubes (PDA@CNT) conjugates for signal amplification. The CdS nanoparticles were first deposited on the WO3 nanorods via sequential chemical bath deposition to form the WO3/CdS structure to enhance photocurrent. Then equipped with PDA to form the WO3/CdS/PDA photosensitive structure. The PDA was used not only to reduce the toxicity of CdS but also adsorb insulin primary antibodies (Ab1)...
May 13, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28525676/dynamic-mechanical-analysis-of-carbon-nanotube-reinforced-nanocomposites
#4
Shiuh-Chuan Her, Kuan-Yu Lin
BACKGROUND: To predict the mechanical properties of multiwalled carbon nanotube (MWCNT)-reinforced polymers, it is necessary to understand the role of the nanotube-polymer interface with regard to load transfer and the formation of the interphase region. The main objective of this study was to explore and attempt to clarify the reinforcement mechanisms of MWCNTs in epoxy matrix. METHODS: Nanocomposites were fabricated by adding different amounts of MWCNTs to epoxy resin...
May 18, 2017: Journal of Applied Biomaterials & Functional Materials
https://www.readbyqxmd.com/read/28524653/benzoate-acid-dependent-lattice-dimension-of-co-mofs-and-mof-derived-cos2-cnts-with-tunable-pore-diameters-for-supercapacitors
#5
Kang-Yu Zou, Yi-Chen Liu, Yi-Fan Jiang, Cheng-Yan Yu, Man-Li Yue, Zuo-Xi Li
Herein three novel cobalt metal-organic frameworks (Co-MOFs) with similar ingredients, [Co(bib)(o-bdc)]∞ (1), [Co2(bib)2(m-bdc)2]∞ (2), and {[Co(bib)(p-bdc)(H2O)](H2O)0.5}∞ (3), have been synthesized from the reaction of cobalt nitrate with 1,4-bis(imidazol-1-yl)benzene (bib) and structure-related aromatic acids (1,2-benzenedicarboxylic acid = o-bdc, 1,3-benzenedicarboxylic acid = m-bdc, and 1,4-benzenedicarboxylic acid = p-bdc) by the solvothermal method. It is aimed to perform systematic research on the relationship among the conformation of benzoate acid, lattice dimension of Co-MOF, and pore diameter of MOF-derived carbon composite...
May 19, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28524195/enhanced-reactivity-and-selectivity-of-asymmetric-oxa-michael-addition-of-2-hydroxychalcones-in-carbon-confined-spaces
#6
Melad Shaikh, Kiran Kumar Atyam, Mahendra Sahu, Kalluri V S Ranganath
Carbon nanotubes (CNTs) are employed as nanoscale reaction vessels for the asymmetric oxa-Michael addition of 2'-hydroxychalcones. A systematic comparison of the catalytic activities of chiral phosphoric acid treated ferrite nanoparticles (chiral ferrites) has been studied for the synthesis of flavanones. Higher reactivity and selectivity with switching of enantiomers were observed when these chiral ferrites are inside the CNT channel.
May 19, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28524087/in-vitro-assessment-of-early-bacterial-activity-on-micro-nanostructured-ti6al4v-surfaces
#7
Benjamin Valdez-Salas, Ernesto Beltrán-Partida, Sandra Castillo-Uribe, Mario Curiel-Álvarez, Roumen Zlatev, Margarita Stoytcheva, Gisela Montero-Alpírez, Lidia Vargas-Osuna
It is imperative to understand and systematically compare the initial interactions between bacteria genre and surface properties. Thus, we fabricated a flat, anodized with 80 nm TiO₂ nanotubes (NTs), and a rough Ti6Al4V surface. The materials were characterized using field-emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX) and atomic force microscopy (AFM). We cultured in vitro Staphylococcus epidermidis (S. epidermidis) and Pseudomonas aeruginosa (P. aeruginosa) to evaluate the bacterial-surface behavior by FE-SEM and viability calculation...
May 18, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28524071/flexible-low-cost-sensor-based-on-electrolyte-gated-carbon-nanotube-field-effect-transistor-for-organo-phosphate-detection
#8
Vijay Deep Bhatt, Saumya Joshi, Markus Becherer, Paolo Lugli
A flexible enzymatic acetylcholinesterase biosensor based on an electrolyte-gated carbon nanotube field effect transistor is demonstrated. The enzyme immobilization is done on a planar gold gate electrode using 3-mercapto propionic acid as the linker molecule. The sensor showed good sensing capability as a sensor for the neurotransmitter acetylcholine, with a sensitivity of 5.7 μA/decade, and demonstrated excellent specificity when tested against interfering analytes present in the body. As the flexible sensor is supposed to suffer mechanical deformations, the endurance of the sensor was measured by putting it under extensive mechanical stress...
May 18, 2017: Sensors
https://www.readbyqxmd.com/read/28523796/silica-polypyrrole-hybrids-as-high-performance-metal-free-electrocatalysts-for-hydrogen-evolution-reaction-in-neutral-media
#9
Jin-Xian Feng, Han Xu, Sheng-Hua Ye, Gangfeng Ouyang, Ye-Xiang Tong, Gao-Ren Li
Constructing inorganic-organic hybrids with high abilities of water adsorption and activation will lead to significant enhancement of electrocatalytic activity for hydrogen evolution reaction (HER) in neutral media that is environmentally benign. Here we report SiO2-polypyrrole (PPy) hybrid nanotubes supported on carbon fibers (CFs) (SiO2/PPy NTs-CFs) as low-cost and high-performance electrocatalysts for HER in neutral media. Because of the strong electronic interactions between SiO2 and PPy, SiO2 uniquely serves as the centers of water adsorption and activation, and accordingly it will obviously promote HER...
May 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28522809/nickel-cobalt-sulfide-core-shell-structure-on-3d-graphene-for-supercapacitor-application
#10
Lemu Girma Beka, Xin Li, Weihua Liu
Three-dimensional (3D) core/shell structure of nickel cobalt sulfide is nano-engineered by using series of hydrothermal steps on a CVD grown graphene for supercapacitor application. This core/shell is composited of NiCo2S4 nanotube (NCS) as core and CoxNi(3-x)S2 (CNS) nanosheets as a shell. The as-synthesized composite exhibits excellent electrochemical properties by using the advantage of NCS nanontube core as superhighway for electron and ion transport, and CNS nanosheets shell as high active area pseudocapacitive material...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28522411/halloysite-and-chitosan-oligosaccharide-nanocomposite-for-wound-healing
#11
Giuseppina Sandri, Carola Aguzzi, Silvia Rossi, Maria Cristina Bonferoni, Giovanna Bruni, Cinzia Boselli, Antonia Icaro Cornaglia, Federica Riva, Cesar Viseras, Carla Caramella, Franca Ferrari
Halloysite is a natural nanotubular clay mineral (HNTs, Halloysite Nano Tubes) chemically identical to kaolinite and, due to its good biocompatibility, is an attractive nanomaterial for a vast range of biological applications. Chitosan oligosaccharides are homo- or heterooligomers of N-acetylglucosamine and D-glucosamine, that accelerate wound healing by enhancing the functions of inflammatory and repairing cells. The aim of the work was the development of a nanocomposite based on HNTs and chitosan oligosaccharides, to be used as pour powder to enhance healing in the treatment of chronic wounds...
May 15, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28520555/relaxation-lifetimes-of-plasmonically-enhanced-hybrid-gold-carbon-nanotubes-systems
#12
Mareen Gläske, Manoj Kumar, Timo Bißwanger, Saulius Vaitiekenas, Cesare Soci, Rohit Narula, Annalisa Bruno, Antonio Setaro
Recently, we introduced a novel hybridization route for carbon nanotubes using gold nanoparticles, whose close proximity neatly enhances their radiative emission. Here we investigate the mechanisms behind the enhancement by monitoring the de-excitation dynamics of our π-hybrids through two-color pump-probe time-resolved spectroscopy. The de-excitation process reveals a fast component and a slow component. We find that the presence of gold prominently affects the fast processes, indicating a stronger influence of the gold nanoparticle on the intra-band non-radiative relaxation than on the inter-band recombination of the SWNT...
May 18, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28520409/feco-anchored-reduced-graphene-oxide-framework-based-soft-composites-containing-carbon-nanotubes-as-highly-efficient-microwave-absorbers-with-excellent-heat-dissipation-ability
#13
Injamamul Arief, Sourav Biswas, Suryasarathi Bose
Conducting polymer composites containing ferromagnetic grafted-graphene derivatives are already appreciated for their lightweight, flexibility and cost effectiveness in terms of microwave absorption. To further leverage the said properties of this wonder material, we propose a highly efficient replacement by blending conducting multi-wall carbon nanotube (MWCNT) and FeCo anchored covalent cross-linked reduced graphene oxide (rGO) with polyvinylidene fluoride (PVDF). Interconnected conducting network of MWCNTs introduces higher electrical conductivity in the blend which is essential for microwave absorption...
May 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28520181/encapsulation-and-polymerization-of-white-phosphorus-inside-single-wall-carbon-nanotubes
#14
Martin Hart, Edward R White, Ji Chen, Catriona M McGilvery, Chris J Pickard, Angelos Michaelides, Andrea Sella, Milo Shaffer, Christoph Günter Salzmann
Elemental phosphorus displays an impressive number of allotropes with highly diverse chemical and physical properties. Here, we report that white phosphorus can be filled into single-wall carbon nanotubes (SWCNTs) from the liquid and thereby stabilized against the highly exothermic reaction with atmospheric oxygen. The encapsulated tetraphosphorus molecules were visualized with transmission electron microscopy, but found to convert readily to chain structures inside the SWCNT 'nanoreactors'. The energies of the possible chain structures were determined computationally highlighting a delicate balance between the extent of polymerization and the SWCNT diameter...
May 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28517106/tunable-supramolecular-assembly-and-photoswitchable-conversion-of-cyclodextrin-diphenylalanine-based-1d-and-2d-nanostructures
#15
He-Lue Sun, Yong Chen, Xu Han, Yu Liu
A photocontrolled, interconvertible supramolecular 2D-nanosheet/1D-nanotube system was constructed through the supramolecular assembly of adamantanyl-modified diphenylalanine with azobenzene-bridged bis(β-cyclodextrin). The nanosheet exhibited a greater fluorescence enhancement effect than the nanotube. Significantly, these nanosheets and nanotubes could interconvert via the photocontrolled trans/cis isomerization of azobenzene linkers in bis(β-cyclodextrin), and this photo-switchable one-dimensional/two-dimensional morphological interconversion was reversible and recyclable...
May 18, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28516911/electrostatic-melting-in-a-single-molecule-field-effect-transistor-with-applications-in-genomic-identification
#16
Sefi Vernick, Scott M Trocchia, Steven B Warren, Erik F Young, Delphine Bouilly, Ruben L Gonzalez, Colin Nuckolls, Kenneth L Shepard
The study of biomolecular interactions at the single-molecule level holds great potential for both basic science and biotechnology applications. Single-molecule studies often rely on fluorescence-based reporting, with signal levels limited by photon emission from single optical reporters. The point-functionalized carbon nanotube transistor, known as the single-molecule field-effect transistor, is a bioelectronics alternative based on intrinsic molecular charge that offers significantly higher signal levels for detection...
May 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/28516778/surfactant-assemblies-on-selected-nano-structured-surfaces-evidence-driving-forces-and-applications
#17
Alberto Striolo, Brian Patrick Grady
Surfactant adsorption at solid-liquid interfaces is critical for a number of applications of vast industrial interest, and can also be used to seed surface-modification processes. Many of the surfaces of interest are nano-structured, as they might present surface roughness at the molecular scale, chemical heterogeneity, as well as a combination of both surface roughness and chemical heterogeneity. These effects provide 'lateral' confinement on the surfactant aggregates. It is of interest to quantify how much surfactant adsorbs on such nano-structured surfaces, and how the surfactant aggregates vary as the degree of lateral confinement changes...
May 18, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28516460/taxane-grafted-metal-oxide-nanoparticles-as-a-new-theranostic-tool-against-cancer-the-promising-example-of-docetaxel-functionalized-titanate-nanotubes-on-prostate-tumors
#18
Alexis Loiseau, Julien Boudon, Céline Mirjolet, Gilles Créhange, Nadine Millot
The combination of anticancer drugs and metal oxide nanoparticles is of great interest in cancer nanomedicine. Here, the development of a new nanohybrid, titanate nanotube-docetaxel (TiONts-DTX) is reported, the two parts of which are conjugated by covalent linkages. Unlike most nanoparticles currently being developed for biomedical purposes, TiONts present a needle-shaped morphology. The surface of TiONts is linked with 3-aminopropyl triethoxysilane and with a hetero-bifunctional polymer (polyethylene glycol) to create well-dispersed and biocompatible nanovectors...
May 18, 2017: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/28516278/molecularly-imprinted-polymers-based-stir-bar-sorptive-extraction-for-determination-of-cefaclor-and-cefalexin-in-environmental-water
#19
Jun Peng, Donghao Liu, Tian Shi, Huairu Tian, Xuanhong Hui, Hua He
Although stir bar sportive extraction was thought to be a highly efficiency and simple pretreatment approach, its wide application was limited by low selectivity, short service life, and relatively high cost. In order to improve the performance of the stir bar, molecular imprinted polymers and magnetic carbon nanotubes were combined in the present study. In addition, two monomers were utilized to intensify the selectivity of molecularly imprinted polymers. Fourier transform infrared spectroscopy, scanning electron microscopy, and selectivity experiments showed that the molecularly imprinted polymeric stir bar was successfully prepared...
May 18, 2017: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/28516178/a-multi-walled-carbon-nanotube-zinc-oxide-nanofiber-based-flexible-chemiresistive-biosensor-for-malaria-biomarker-detection
#20
Brince Paul K, Asisa Kumar Panigrahi, Vikrant Singh, Shiv Govind Singh
We report the fabrication of a flexible, lightweight and disposable multi walled carbon nanotube (MWCNT)-zinc oxide (ZnO) nanofiber based chemiresistive biosensor for label free detection of the malaria biomarker, histidine rich protein II (HRP2). The sensing platform is formed by depositing nanofibers in between the source and drain electrodes patterned on a thin, flexible polyethylene terephthalate (PET) substrate. MWCNT-ZnO nanofibers are synthesized via the electrospinning technique followed by a calcination process...
May 18, 2017: Analyst
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