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carbon nano article

Swati Sharma
When certain polymers are heat-treated beyond their degradation temperature in the absence of oxygen, they pass through a semi-solid phase, followed by the loss of heteroatoms and the formation of a solid carbon material composed of a three-dimensional graphenic network, known as glassy (or glass-like) carbon. The thermochemical decomposition of polymers, or generally of any organic material, is defined as pyrolysis. Glassy carbon is used in various large-scale industrial applications and has proven its versatility in miniaturized devices...
September 28, 2018: Materials
Vivek K Chaturvedi, Anshuman Singh, Vinay K Singh, M P Singh
Background- Nanotechnology is gaining significant attention worldwide for cancer treatment. Nano-biotechnology encourages the combination of diagnostics with therapeutics, which is a vital component of a customized way to deal with the malignancy. Nanoparticles are being used as Nanomedicine which participates in diagnosis and treatment of various diseases including cancer. The unique characteristic of Nanomedicine i.e. their high surface to volume ratio enables them to tie, absorb, and convey small biomolecule like DNA, RNA, drugs, proteins, and other molecules to the targeted site and thus enhances the efficacy of therapeutic agents...
September 18, 2018: Current Drug Metabolism
Dapeng Xu, Ping Sun, Yizhe Zhang, Ran Li, Bangqin Huang, Nianzhi Jiao, Alan Warren, Lei Wang
Phototrophic microbial eukaryotes dominate primary production over large oceanic regions. Due to their small sizes and slow sinking rates, it is assumed they contribute relatively little to the downward export of organic carbon via the biological pump. Therefore, the community structure of phototrophic cells in the deep ocean has long been overlooked and remains largely unknown. In this study, we used an integrative approach, including epifluorescence microscopy, sequencing of 18S rRNA and photosystem-II psbA gene transcripts, to investigate phototrophic microbial eukaryotes in samples collected from the tropical Western Pacific Ocean...
August 29, 2018: Environmental Microbiology
Aleksandr B Stefaniak, Lauren N Bowers, Alycia K Knepp, M Abbas Virji, Eileen M Birch, Jason E Ham, J R Wells, Chaolong Qi, Diane Schwegler-Berry, Sherri Friend, Alyson R Johnson, Stephen B Martin, Yong Qian, Ryan F LeBouf, Quinn Birch, Duane Hammond
Fused deposition modeling (FDM™) 3-dimensional printing uses polymer filament to build objects. Some polymer filaments are formulated with additives, though it is unknown if they are released during printing. Three commercially available filaments that contained carbon nanotubes (CNTs) were printed with a desktop FDM™ 3-D printer in a chamber while monitoring total particle number concentration and size distribution. Airborne particles were collected on filters and analyzed using electron microscopy. Carbonyl compounds were identified by mass spectrometry...
August 13, 2018: Indoor Air
Yaping Li, Xin Zhang, Yingfeng Wang, Yuqing Lin, Jing Zhou
An adsorbent of carbon dot@poly(glycidyl methacrylate)@Fe3 O4 nanoparticles has been developed for the microwave-assisted magnetic solid-phase extraction of polycyclic aromatic hydrocarbons in environmental aqueous samples prior to high-performance liquid chromatography with UV/visible spectroscopy detection. Poly(glycidyl methacrylate) was synthesized by atom transfer radical polymerization. The chain length and amount of carbon dots attached on them can be easily controlled through changing polymerization conditions, which contributes to tunable extraction performance...
September 2018: Journal of Separation Science
Yongjin Lee, Senja D Barthel, Paweł Dłotko, Seyed Mohamad Moosavi, Kathryn Hess, Berend Smit
The materials genome initiative has led to the creation of a large (over a million) database of different classes of nanoporous materials. As the number of hypothetical materials that can, in principle, be experimentally synthesized is infinite, a bottleneck in the use of these databases for the discovery of novel materials is the lack of efficient computational tools to analyze them. Current approaches use brute-force molecular simulations to generate thermodynamic data needed to predict the performance of these materials in different applications, but this approach is limited to the analysis of tens of thousands of structures due to computational intractability...
August 14, 2018: Journal of Chemical Theory and Computation
Stavros Alexandros Theofanidis, Vladimir V Galvita, Christos Konstantopoulos, Hilde Poelman, Guy B Marin
The role of iron in view of its further utilization in chemical processes is presented, based on current knowledge of its properties. The addition of iron to a catalyst provides redox functionality, enhancing its resistance to carbon deposition. FeOx species can be formed in the presence of an oxidizing agent, such as CO₂, H₂O or O₂, during reaction, which can further react via a redox mechanism with the carbon deposits. This can be exploited in the synthesis of active and stable catalysts for several processes, such as syngas and chemicals production, catalytic oxidation in exhaust converters, etc...
May 17, 2018: Materials
Syamantak Khan, Akshita Sharma, Sourav Ghoshal, Sanjhal Jain, Montu K Hazra, Chayan K Nandi
The most commonly observed phenomena in carbon nanodots (CNDs) are the strong excitation wavelength dependent multicolor fluorescence emission and the particle size distribution between 3-5 nm observed using a transmission electron microscope (TEM). However, it is not evident yet whether the emission originates from the particles observed using a TEM. In this article, we show that hydrothermal treatment of citric acid produces methylenesuccinic acid, which gives rise to hydrogen-bonded nano-assemblies with CND-like properties...
January 7, 2018: Chemical Science
Hong Zhang, Ximeng Liu, Yue Wu, Cao Guan, Anthony K Cheetham, John Wang
More than 20 000 MOFs have been reported to date, with different combinations of metal ions/centers and organic linkers, and they can be grown into various 3D, 2D, 1D and 0D morphologies. The flexibility in control over varying length scales from atomic scale up to bulk structure allows access to an almost endless variety of MOF-based and MOF-derived materials. Indeed, MOFs themselves have been studied as a class of useful functional materials. More remarkably, extensive research conducted in recent years has shown that MOFs are exceptionally good precursors for a large variety of nanohybrids as active materials in both electrocatalysis and energy storage...
May 22, 2018: Chemical Communications: Chem Comm
Ashley N Parks, Mark G Cantwell, David R Katz, Michaela A Cashman, Todd P Luxton, Kay T Ho, Robert M Burgess
Little is known about the release of metal engineered nanomaterials (ENMs) from consumer goods, including lumber treated with micronized copper. Micronized copper is a recent form of antifouling wood preservative containing nanosized copper particles for use in pressure-treated lumber. The present study investigated the concentrations released and the release rate of total copper over the course of 133 d under freshwater, estuarine, and marine salinity conditions (0, 1, 10, and 30‰) for several commercially available pressure-treated lumbers: micronized copper azole (MCA) at 0...
July 2018: Environmental Toxicology and Chemistry
Zahra Mofidi, Parviz Norouzi, Masumeh Sajadian, Mohammad Reza Ganjali
A novel, simple, and inexpensive analytical technique based on flat sheet supported liquid membrane microextraction coupled with fast Fourier transform stripping cyclic voltammetry on a reduced graphene oxide carbon paste electrode was used for the extraction and online determination of diclofenac in whole blood. First, diclofenac was extracted from blood samples using a polytetrafluoroethylene membrane impregnated with 1-octanol and then into an acceptor solution, subsequently it was oxidized on a carbon paste electrode modified with reduced graphene oxide nanosheets...
April 2018: Journal of Separation Science
Vyacheslav Kuzmin, Kajum Safiullin, Gleb Dolgorukov, Andrey Stanislavovas, Egor Alakshin, Timur Safin, Boris Yavkin, Sergei Orlinskii, Airat Kiiamov, Mikhail Presnyakov, Alexander Klochkov, Murat Tagirov
In this article a method to assess the location of paramagnetic centers in nanodiamonds was proposed. The nuclear magnetic relaxation of adsorbed3 He used as a probe in this method was studied at temperatures of 1.5-4.2 K and magnetic fields of 100-600 mT. A strong influence of the paramagnetic centers of the sample on the3 He nuclear spin relaxation time T1 was found. Preplating the nanodiamond surface with adsorbed nitrogen layers allowed us to vary the distance from3 He nuclei to paramagnetic centers in a controlled way and to determine their location using a simple model...
January 17, 2018: Physical Chemistry Chemical Physics: PCCP
Andrew Williams, Sabina Halappanavar
This article contains data related to the research article ' Application of bi-clustering of gene expression data and gene set enrichment analysis methods to identify potentially disease causing nanomaterials ' (Williams and Halappanavar, 2015) [1]. The presence of diverse types of nanomaterials (NMs) in commerce has grown significantly in the past decade and as a result, human exposure to these materials in the environment is inevitable. The traditional toxicity testing approaches that are reliant on animals are both time- and cost- intensive; employing which, it is not possible to complete the challenging task of safety assessment of NMs currently on the market in a timely manner...
December 2017: Data in Brief
Yanzhuo Zhang, Wufu Zhu, Heran Zhang, Jin Han, Lihua Zhang, Qisi Lin, Fengwei Ai
In this article, a new type of carboxymethyl chitosan/phospholipid bilayer-capped mesoporous carbon nanomatrix (CCS/PL/MC) was fabricated as a potential nano-drug delivery system. In this drug delivery system, a mesoporous carbon nanomatrix (MC) acts as the support for loading drug molecules, a positively charged phospholipid (PL) layer works as the inner shell for prolonged drug release and a negatively charged carboxymethyl chitosan (CCS) layer serves as the outer shell for pH-responsive drug release. Docetaxel (DTX) was selected as a model drug...
October 30, 2017: International Journal of Pharmaceutics
Xu Wang, Guanhong Xu, Fangdi Wei, Yunsu Ma, Yujie Ma, Yueyue Song, Yao Cen, Qin Hu
In this article, a novel aptasensor was fabricated by modifying carbon dots (CDs) with adenosine aptamer (CDs-aptamer) for sensitive, selective and quantitative detection of adenosine (AD). When nano-graphite (NG) as an energy acceptor was added into the CDs-aptamer (energy donor) solution, the fluorescence of CDs-aptamer was quenched due to fluorescence resonance energy transfer (FRET). When AD was present in the solution of CDs-aptamer/NG, the process of FRET was inhibited because of the specific combination between AD and AD aptamer...
December 15, 2017: Journal of Colloid and Interface Science
Steven L Suib
This personal account concerns novel recent discoveries in the area of mesoporous materials. Most of the papers discussed have been published within the last two to three years. A major emphasis of most of these papers is the synthesis of unique mesoporous materials by a variety of synthetic methods. Many of these articles focus on the control of the pore sizes and shapes of mesoporous materials. Synthetic methods of various types have been used for such control of porosity including soft templating, hard templating, nano-casting, electrochemical methods, surface functionalization, and trapping of species in pores...
December 2017: Chemical Record: An Official Publication of the Chemical Society of Japan ... [et Al.]
Ki Dong Yang, Chan Woo Lee, Jun Ho Jang, Tak Rae Ha, Ki Tae Nam
The electrocatalytic conversion of CO2 into value-added fuels has received increasing attention as a promising way to mitigate the atmospheric CO2 concentration and close the broken carbon-cycle. Early studies, focused on polycrystalline metal electrodes, outlined in detail the overall trends in the catalytic activity and product selectivity of pure metals; however, several inherent limitations were found, such as low current density and high overpotential, which hindered electrocatalytic CO2 reduction from practical application...
September 1, 2017: Nanotechnology
Irina Guseva Canu, Delphine Jezewski-Serra, Laurène Delabre, Stéphane Ducamp, Yuriko Iwatsubo, Sabine Audignon-Durand, Cécile Ducros, Anca Radauceanu, Catherine Durand, Olivier Witschger, Emmanuel Flahaut
The relatively recent development of industries working with nanomaterials has created challenges for exposure assessment. In this article, we propose a relatively simple approach to assessing nanomaterial exposures for the purposes of epidemiological studies of workers in these industries. This method consists of an onsite industrial hygiene visit of facilities carried out individually and a description of workstations where nano-objects and their agglomerates and aggregates (NOAA) are present using a standardized tool, the Onsite technical logbook...
January 1, 2017: Annals of Work Exposures and Health
X S Lv, Y Qiu, Z Y Wang, G M Jiang, Y T Chen, X H Xu, R H Hurt
Iron-based nanoparticles form the basis for a host of sustainable alternative technologies based on this earth-abundant, low-toxicity element that can adopt a variety of oxidation states, crystal phases, and functions. Control of size, shape, and phase stability is a challenge for many nano-iron-based technologies, especially those involving Fe(0) that is susceptible to oxidation under ambient conditions. This article presents a continuous method for hybridizing Fe-based nanoparticles with carbon in the form of graphene-encapsulated Fe-based particles with core-shell symmetry that allows flexible control of iron particle size, shape, and phase stability...
October 1, 2016: Environmental Science. Nano
Pooria Namdari, Babak Negahdari, Ali Eatemadi
Carbon-based quantum dots (CQDs) are a newly developed class of carbon nano-materials that have attracted much interest and attention as promising competitors to already available semiconductor quantum dots owing to their un-comparable and unique properties. In addition, controllability of CQDs unique physiochemical properties is as a result of their surface passivation and functionalization. This is an update article (between 2013 and 2016) on the recent progress, characteristics and synthesis methods of CQDs and different advantages in varieties of applications...
March 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
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