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carbon nanomaterial

Xiangqian Li, Yuhui Zheng, Yiping Tang, Qi Chen, Jinwei Gao, Qi Luo, Qianming Wang
An efficient strategy for the synthesis of excitation-independent carbon nanodots has been provided. This functional nano-scale particle has been assembled by using citric acid and urea as raw materials through a microwave irradiation process in the absence of further surface modifications. The achieved nanomaterial demonstrates intensive green emissions and can be dispersible in aqueous environment. In particular, cerium (III) ion is able to quench its fluorescence emission intensity selectively and an "on-off" change has been observed...
August 13, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Jaewook Lee, Oluwasesan Adegoke, Enoch Y Park
Recently, highly sensitive and selective biosensors have become necessary for improving public health and well-being. To fulfill this need, high-performance biosensing systems based on various nanomaterials, such as nanoparticles, carbon nanomaterials, and hybrid nanomaterials, have been developed. Numerous nanomaterials have shown excellent physical properties, including plasmonic, magnetic, catalytic, mechanical and fluorescence properties and high electrical conductivities, and these unique and beneficial properties have contributed to the fabrication of high-performance biosensors with various applications, including in optical, electrical, and electrochemical detection platforms...
August 17, 2018: Biotechnology Journal
Mattia Scardamaglia, Carla Bittencourt
In this review, we discuss the use of doped carbon nanomaterials in catalysis, a subject that is currently intensively studied. The availability of carbon nanotubes since the 1990's and of graphene ten years later prompted the development of novel nanotechnologies. We review this topic linking fundamental surface science to the field of catalysis giving a timely picture of the state of the art. The main scientific questions that material scientists have addressed in the last decades are described, in particular the enduring debate on the role of the different nitrogen functionalities in the catalytic activity of nitrogen-doped carbon nanotubes and graphene...
2018: Beilstein Journal of Nanotechnology
Hongguang Li, Shengju Zhou, Linwen Zhang, Mengjun Chen, Wei Pan, Jingcheng Hao, Yongqiang Feng
Fullerenols have been known for decades. However, their photoluminescent (PL) properties and applications in supramolecular chemistry have not been well addressed. In this paper, we developed a strategy to purify the as-prepared fullerenols and systematically studied their photoluminescence and capabilities to form supramolecular self-assemblies. It was found that fullerenols show wavelength-dependent emission with an absolute fluorescent quantum yield of ∼3.5%. The PL characteristics are reminiscent of carbon dots, especially those obtained from top-down method...
August 16, 2018: Chemistry: a European Journal
Menggang Li, Wenjuan Lei, Yongsheng Yu, Weiwei Yang, Ji Li, Dafa Chen, Shichong Xu, Ming Feng, Haibo Li
Monodisperse spherical MnO nanocrystals (NCs) with a size of 22.5 nm were synthesized by the thermal decomposition of manganese oleate in the presence of oleic acid and 1-octadecene. The as-synthesized MnO NCs show superior electrochemical performances with a specific capacitance of 736.4 F g-1 at a current density of 1 A g-1 and retain 93.3% of initial specific capacitance after 5000 cycles. The MnO NC electrode was successfully assembled in an asymmetric supercapacitor as the cathode with an activated carbon (AC) electrode as the anode...
August 16, 2018: Nanoscale
Wei Zhang, Jianchao Zhang, Yahai Lu
It remains elusive if direct interspecies electron transfer (DIET) occurs in canonical syntrophy involving short-chain fatty acids oxidation. In the present study, we determined the effects of carbon nanomaterials on syntrophic oxidation of butyrate in two lake sediment enrichments and a defined coculture comprising Syntrophomonas wolfei and Methanococcus Maripaludis. After four continuous transfers of enrichment cultivation, Syntrophomonas dominated the bacterial populations in enrichments, and the dominated methanogens comprised Methanosarcina and Methanospirillum in one enrichment (from Weiming Lake) and Methanoregula and Methanospirillum in another (from Erhai Lake)...
August 15, 2018: Scientific Reports
Liang Liu, Maryam Borghei, Zhiguo Wang, Junhua Xu, Yimin Fan, Orlando J Rojas
This study is aimed at facilitating the use of ocean biomass for the isolation and use of derived nanostructures. Specifically, cationic and anionic nanochitins were produced from never-dried crab shells followed by partial deacetylatation (PD-NCh) or TEMPO-oxidization (TO-NCh). The effect of different electrolyte types (NaCl, CH3COONa, Na2CO3, CaCl2, AlCl3, NH4Cl) is investigated with regards to fractionation (via colloidal destabilization and precipitation), drying and ultimate redispersion of the nanochitins...
August 15, 2018: Journal of Agricultural and Food Chemistry
Adam J Clancy, Mustafa K Bayazit, Stephen A Hodge, Neal T Skipper, Christopher A Howard, Milo S P Shaffer
Since the discovery of buckminsterfullerene over 30 years ago, sp2 -hybridised carbon nanomaterials (including fullerenes, carbon nanotubes, and graphene) have stimulated new science and technology across a huge range of fields. Despite the impressive intrinsic properties, challenges in processing and chemical modification continue to hinder applications. Charged carbon nanomaterials (CCNs), formed via the reduction or oxidation of these carbon nanomaterials, facilitate dissolution, purification, separation, chemical modification, and assembly...
August 15, 2018: Chemical Reviews
Sitong Liu, Jisheng Zhou, Huaihe Song
We develop a general strategy for the design of a series of 2D N-rich carbon-based nanomaterials through the thermal exfoliation of layered metal-hexamine framework microcrystals. By a facile pyrolysis, the sharply generated gases escape from the layered precursors, leading to the exfoliation of the layers and successful preparation of 2D carbon-based nanomaterials. This strategy can readily skip the complicated morphology engineering process of 2D metal-organic frameworks to produce 2D N-rich carbon-based nanomaterials on a large scale...
August 15, 2018: Chemical Communications: Chem Comm
Daniela Iannazzo, Alessandro Pistone, Stefania Ferro, Laura De Luca, Annamaria Monforte, Roberto Romeo, Maria Rosa Buemi, Christophe Pannecouque
Graphene quantum dots (GQD) are the next generation of nanomaterials with great potential in drug delivery and target-specific HIV inhibition. In this study we investigated the antiviral activity of graphene based nanomaterials by using water soluble GQD synthesized from multi-walled carbon nanotubes (MWCNT) through prolonged acidic oxidation and exfoliation and compared their anti-HIV activity with that exerted by reverse transcriptase inhibitors (RTI) conjugated with the same nanomaterial. The antiretroviral agents chosen in this study, CHI499 and CDF119, belong to the class of non-nucleoside reverse transcriptase inhibitors (NNRTI)...
August 14, 2018: Bioconjugate Chemistry
Siyang Song, Hongzhe Fu, Bing He, Dan Wang, Mengmeng Qin, Dan Yang, Dechun Liu, Ge Song, Yujie Shi, Hua Zhang, Xueqing Wang, Wenbing Dai, Qiang Zhang
Introduction: Endocytosis of nanomaterials is the first step of nano-bio interaction and current regulation is mostly by nanomaterials but seldom by intracellular signaling proteins. Materials and methods: Herein, we synthesized tubular nanocarbon (oxMWCNT) and lamellar-like nanocarbon (oxGRAPHENE) and formulated their aqueous dispersion. A549 and Caco-2 cells were selected as the models of tumor and intestinal epithelial cells, respectively. After knocking down three members of Rho GTPases (Cdc42, Rac1, RhoA) in these two cell lines, their silencing effects on the uptake pathways of nanomaterials with different morphologies were investigated...
2018: International Journal of Nanomedicine
Khwaja Salahuddin Siddiqi, Azamal Husen, Sayed Sartaj Sohrab, Mensur Osman Yassin
Nanomaterials (NMs) are receiving remarkable attention due to their unique properties and structure. They vary from atoms and molecules along with those of bulk materials. They can be engineered to act as drug delivery vehicles to cross blood-brain barriers (BBBs) and utilized with better efficacy and safety to deliver specific molecules into targeted cells as compared to conventional system for neurological disorders. Depending on their properties, various metal chelators, gold nanoparticles (NPs), micelles, quantum dots, polymeric NPs, liposomes, solid lipid NPs, microparticles, carbon nanotubes, and fullerenes have been utilized for various purposes including the improvement of drug delivery system, treatment response assessment, diagnosis at early stage, and management of neurological disorder by using neuro-engineering...
August 10, 2018: Nanoscale Research Letters
Sanjiv K Jha, Michael Roth, Guido Todde, J Paige Buchanan, Robert D Moser, Manoj K Shukla, Gopinath Subramanian
We investigate computationally the role of Stone-Wales (SW) defects on the interfacial interactions among graphene, carbon nanotubes (CNTs), and Nylon 6 using density functional theory (DFT) and the empirical force-field. Our first-principles DFT calculations were performed using the Quantum ESPRESSO electronic structure code with the highly accurate van der Waals functional (vdW-DF2). Both pristine and SW-defected carbon nanomaterials were investigated. The computed results show that the presence of SW defects on CNTs weakens the CNT-graphene interactions...
August 7, 2018: Journal of Chemical Physics
Sifei Zhuo, Yusuf Shi, Lingmei Liu, Renyuan Li, Le Shi, Dalaver H Anjum, Yu Han, Peng Wang
Hybrid nanostructures integrating electroactive materials with functional species, such as metal-organic frameworks, covalent organic frameworks, graphdiyne etc., are of significance for both fundamental research and energy conversion/storage applications. Here, hierarchical triple-layered nanotube arrays, which consist of hydrogen-substituted graphdiyne frameworks seamlessly sandwiched between an outer layer of nickel-cobalt co-doped molybdenum disulfide nanosheets and an inner layer of mixed cobalt sulfide and nickel sulfide (Co9 S8 /Ni3 S2 ), are directly fabricated on conductive carbon paper...
August 7, 2018: Nature Communications
Ammar Ebrahimi, Iraj Nikokar, Mehrdad Zokaei, Elahe Bozorgzadeh
The new sensitive diagnostic method, electrochemical nanobiosensor, is applied to cancer detection by using specific biomarkers such as miRNA. Studies have shown that for the diagnosis of Triple Negative Breast Cancer (TNBC) patients, in the early stages of the disease, miR-199a-5p as circulating miRNA can be a suitable candidate. In this study, a new electrochemical nanobiosensor for serum miR-199a-5p detection was designed by using modified glassy carbon electrode (GCE) with graphene oxide (GO) and gold nanoroad (GNR) on which a thiolated probe was immobilized...
November 1, 2018: Talanta
Núria Serrano, Xavier Cetó, Oscar Núñez, Miriam Aragó, Alejandro Gámez, Cristina Ariño, José Manuel Díaz-Cruz
Screen-printed electrodes based on graphite, carbon nanotubes, carbon nanofibers, and graphene were tested as amperometric detectors for the determination of phenolic compounds by high performance liquid chromatography (HPLC). The chromatographic performance as well as the obtained sensitivity, detection and quantification limits suggest that carbon nanofibers modified screen-printed electrode (SPCE-CNF) is the amperometric sensor that provides the best analytical performance. Upon this confirmation, chromatographic data obtained using SPCE-CNF were exploited by means of linear discriminant analysis (LDA) to successfully characterize and classify 96 Spanish paprika (Capsicum annuum L...
November 1, 2018: Talanta
Maria Rita Tomei, Fabiana Arduini, Daniela Neagu, Danila Moscone
Chlorine is the most common chemical compound used for treatment of water at ppm levels, although at higher concentration it can generate harmful disinfection by-products. To easily monitor the correct level of free chlorine, cost-effective and miniaturized devices for fast and on-site detection are required. Herein, we report the development of a novel miniaturized and cost-effective screen-printed electrode modified with carbon black nanomaterial for an effective amperometric detection of free chlorine in swimming pool water...
November 1, 2018: Talanta
Jieqiang Zhong, Alireza Banazadeh, Wenjing Peng, Yehia Mechref
In recent decades, matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS) has been extensively used for the analysis of glycans. However, native glycans usually have low ionization efficiency in MS, which hinders the direct analysis. Permethylation of glycans is a solution for this issue, but a significant amount of salt is introduced during this process, which can further suppress the MS signals. Thus, it is necessary to purify the glycans prior to MALDI-MS analysis. In this study, we developed a carbon nanoparticles-based solid-phase purification method to enable direct MALDI-MS analysis of permethylated glycans...
August 7, 2018: Electrophoresis
Sergii Kalytchuk, Yu Wang, Katerina Polakova, Radek Zbořil
Carbon dots (CDs) rank among the most promising luminescent nanomaterials for anti-counterfeiting application owing to their high fluorescence quantum yield and nontoxicity. Herein we report a novel, high-level security performance anti-counterfeiting strategy achieved by fluorescence lifetime-encoded carbon dot fluorescent inks. CD inks have identical steady-state emission properties, but they have distinctive and well-separated fluorescence lifetimes allowing authentication of security tags using exclusively fluorescence lifetime imaging (FLI)...
August 7, 2018: ACS Applied Materials & Interfaces
R Karthik, J Vinoth Kumar, Shen-Ming Chen, P Sundaresan, B Mutharani, Yu Chi Chen, V Muthuraj
Design and fabrication of novel inorganic nanomaterials for the low-level detection of food preservative chemicals significant is of interest to the researchers. In the present work, we have developed a novel grass-like vanadium disulfide (GL-VS2 ) through a simple sonochemical method without surfactants or templates. As-prepared VS2 was used as an electrocatalyst for reduction of hydrogen peroxide (H2 O2 ). The crystalline nature, surface morphology, elemental compositions and binding energy of the as-prepared VS2 were analyzed by X-ray diffraction, Raman spectroscopy, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy...
November 2018: Ultrasonics Sonochemistry
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