37 results match your criteria penetrated graphene


Gas molecules sandwiched in hydration layers at graphite/water interfaces.

Phys Chem Chem Phys 2020 Jun;22(24):13629-13636

Department of Aeronautics and Astronautics, Kyushu University, Nishi-Ku, Motooka 744, Fukuoka 819-0395, Japan. and International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Nishi-Ku, Motooka 744, Fukuoka 819-0395, Japan.

Hydration structures are ubiquitous at solid/liquid interfaces and play a key role in various physicochemical and biological phenomena. Recently, it has been reported that dissolved gas molecules attracted to hydrophobic surfaces form adsorbed gas layers. Although a hydration structure and adsorbed gas layers coexist on the surface, the relationships between them remain unknown. Read More

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Synergistic Antibacterial Activity of Silver-Loaded Graphene Oxide towards and .

Nanomaterials (Basel) 2020 Feb 20;10(2). Epub 2020 Feb 20.

Department of Chemical and Materials Engineering, Chang Gung University, Taoyuan City 33302, Taiwan.

In this study, the physicochemical and surface properties of the GO-Ag composite promote a synergistic antibacterial effect towards both Gram-negative () and Gram-positive () bacteria. GO-Ag NPs have a better bactericidal effect on (73%) and (98.5%) than pristine samples (pure Ag or GO). Read More

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February 2020

Rabies virus glycoprotein-amplified hierarchical targeted hybrids capable of magneto-electric penetration delivery to orthotopic brain tumor.

J Control Release 2020 05 8;321:159-173. Epub 2020 Feb 8.

Department of Biomedical Engineering and Environmental Science, National Tsing Hua University, Hsinchu, Taiwan. Electronic address:

Compact nanohybrids can potentially unite various therapeutic features and reduce side effects for precise cancer therapy. However, the poor accumulation and limited tumor penetration of drugs at the tumor impede the manifestation of nanomedicine. We developed a rabies virus glycoprotein (RVG)-amplified hierarchical targeted hybrid that acts as a stealthy and magnetolytic carrier that transports dual tumor-penetrating agents incorporating two drugs (boron-doped graphene quantum dots (B-GQDs)/doxorubicin and pH-responsive dendrimers (pH-Den)/palbociclib). Read More

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Multiple Analysis and Characterization of Novel and Environmentally Friendly Feather Protein-Based Wood Preservatives.

Polymers (Basel) 2020 Jan 19;12(1). Epub 2020 Jan 19.

Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China.

In this study, feather was used as the source of protein and combined with copper and boron salts to prepare wood preservatives with nano-hydroxyapatite or nano-graphene oxide as nano-carriers. The treatability of preservative formulations, the changes of chemical structure, micromorphology, crystallinity, thermal properties and chemical composition of wood cell walls during the impregnation and decay experiment were investigated by retention rate of the preservative, Fourier transform infrared spectroscopy (FT-IR), scanning electronic microscopy-energy dispersive spectrometer (SEM-EDS), X-ray diffraction (XRD), thermoanalysis (TG), and confocal Raman microscopy (CRM) techniques. Results revealed that the preservatives (particularly with nano-carrier) successfully penetrated wood blocks, verifying the enhanced effectiveness of protein-based preservative with nano-carrier formulations. Read More

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January 2020

Revealing the role of different nitrogen functionalities in the drug delivery performance of graphene quantum dots: a combined density functional theory and molecular dynamics approach.

J Mater Chem B 2019 10;7(40):6156-6171

Department of Chemistry, Amirkabir University of Technology (Tehran Polytechnic), P.O. Box: 15875-4413, Tehran, Iran.

The amount and type of nitrogen (N) functionalities in graphene quantum dots can be controlled by tuning the synthesis conditions, which gives rise to their diverse applications. Nitrogen-doped graphene quantum dots (N-GQDs) are highly biocompatible and their properties can be easily tuned. In this work, the role of different N-functionalities in the drug delivery performance of N-GQDs was investigated via molecular dynamics (MD) simulations and density functional theory (DFT) calculations. Read More

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October 2019

In Vitro and in Vivo Antimicrobial Evaluation of Graphene-Polyindole (Gr@PIn) Nanocomposite against Methicillin-Resistant Pathogen.

ACS Omega 2018 Aug 20;3(8):9431-9440. Epub 2018 Aug 20.

Department of Applied Chemistry, Z. H. College of Engg. & Tech., and Interdisciplinary Nanotechnology Centre (INC), Z. H. College of Engg. & Tech., Aligarh Muslim University, Aligarh 202002 Uttar Pradesh, India.

Nowadays, the infection caused by the methicillin-resistant (MRSA) and countless different types of bacterial infection cause the death of millions of people worldwide. Thereby, several strategies have explored for the advancement of better and active antimicrobial agents; one of these lies in the form of two-dimensional carbon-based nanocomposites. Herein, we demonstrate the synthesis of the graphene-polyindole (Gr@PIn) nanocomposite and polyindole (PIn) and significantly enhance the proficiency against MRSA strains which are immune to most antibiotics. Read More

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Ecoflex-Passivated Graphene-Yarn Composite for a Highly Conductive and Stretchable Strain Sensor.

J Nanosci Nanotechnol 2019 Oct;19(10):6690-6695

Department of Electronics and Computer Engineering, Hanyang University, Seoul 04763, Korea.

We present a flexible strain sensor based on a graphene-yarn composite obtained by spray coating of graphene nanoplates. To improve the stretchability, graphene nanoplates were spray-coated instead of dip-coated on pre-stretched yarn. The spray-coating method yielded not only 3. Read More

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October 2019

NanoFeO as Solid Electron Shuttles to Accelerate Acetotrophic Methanogenesis by .

Front Microbiol 2019 5;10:388. Epub 2019 Mar 5.

Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, China.

Magnetite nanoparticles (nanoFeO) have been reported to facilitate direct interspecies electron transfer (DIET) between syntrophic bacteria and methanogens thereby improving syntrophic methanogenesis. However, whether or how nanoFeO affects acetotrophic methanogenesis remain unknown. Herein, we demonstrate the unique role of nanoFeO in accelerating methane production from direct acetotrophic methanogenesis in -enriched cultures, which was further confirmed by pure cultures of Compared with other nanomaterials of higher electrical conductivity such as carbon nanotubes and graphite, nanoFeO with mixed valence Fe(II) and Fe(III) had the most significant stimulatory effect on methane production, suggesting its redox activity rather than electrical conductivity led to enhanced methanogenesis by . Read More

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Carbon-Nanomaterial-Based Flexible Batteries for Wearable Electronics.

Adv Mater 2019 Mar 25;31(9):e1800716. Epub 2019 Jan 25.

Center for Nanochemistry, Beijing Science and Engineering Center for Nanocarbons, Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.

Wearable electronics have received considerable attention in recent years. These devices have penetrated every aspect of our daily lives and stimulated interest in futuristic electronics. Thus, flexible batteries that can be bent or folded are desperately needed, and their electrochemical functions should be maintained stably under the deformation states, given the increasing demands for wearable electronics. Read More

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Force Spectroscopy Revealed a High-Gas-Density State near the Graphite Substrate inside Surface Nanobubbles.

Langmuir 2019 Feb 8;35(7):2498-2505. Epub 2019 Feb 8.

Key Laboratory of Interfacial Physics and Technology , Shanghai Institute of Applied Physics, Chinese Academy of Sciences , Shanghai 201800 , China.

The absorption of gas molecules at hydrophobic surfaces may have a special state and play an important role in many processes in interfacial physics, which has been rarely considered in previous theory. In this paper, force spectroscopic experiments were performed by a nanosized AFM probe penetrated into individual surface nanobubbles and contacted with a highly ordered pyrolytic graphite (HOPG) substrate. The results showed that the adhesion force at the gas/solid interface was much smaller than that in air measured with the same AFM probe. Read More

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February 2019

Multiplexed determination of intracellular messenger RNA by using a graphene oxide nanoprobe modified with target-recognizing fluorescent oligonucleotides.

Mikrochim Acta 2018 11 15;185(12):552. Epub 2018 Nov 15.

Department of Pharmacy, Shantou University Medical College, No. 22 Xinling Road, Shantou, 515041, China.

A multiplexed graphene oxide (GO) fluorescent nanoprobe is described for quantification and imaging of messenger RNAs (mRNAs) in living cells. The recognizing oligonucleotides (with sequences complementary to those of target mRNAs) were labeled with different fluorescent dyes. If adsorbed on GO, the fluorescence of the recognizing oligonucleotides is quenched. Read More

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November 2018

Reduced graphene oxide triggered epithelial-mesenchymal transition in A549 cells.

Sci Rep 2018 10 12;8(1):15188. Epub 2018 Oct 12.

Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, 361021, China.

Graphene and its derivatives have exhibited wide potential applications in electronics, structural engineering and medicine. However, over utilization and untreated discharge may cause its distribution into environmental as well as biological chain, which raised the concerns of potential health risk as a potential hazard. Accumulating evidence has demonstrated that graphene derivatives induce lung fibrosis in vivo, so overall goal of this study was to explore the molecular mechanisms underlying the pulmonary fibrotic responses of reduced graphene oxide (rGO), using in vitro assays. Read More

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October 2018

Quad-Model Imaging-Guided High-Efficiency Phototherapy Based on Upconversion Nanoparticles and ZnFeO Integrated Graphene Oxide.

Inorg Chem 2018 Aug 2;57(16):9988-9998. Epub 2018 Aug 2.

Key Laboratory of the Ministry of Education for Advanced Catalysis Materials , Zhejiang Normal University , Jinhua , Zhejiang 321004 , P. R. China.

The strategy of diagnosis-to-therapy to realize the integration of imaging and high antitumor efficiency has become the most promising method. Light-induced therapeutic technologies have drawn considerable interest. However, the limited penetration depth of UV/vis excitation and relatively low efficiency are the main obstacles for its further clinic application. Read More

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Ferroelectric switching of a two-dimensional metal.

Nature 2018 08 23;560(7718):336-339. Epub 2018 Jul 23.

Department of Physics, University of Washington, Seattle, WA, USA.

A ferroelectric is a material with a polar structure whose polarity can be reversed (switched) by applying an electric field. In metals, itinerant electrons screen electrostatic forces between ions, which explains in part why polar metals are very rare. Screening also excludes external electric fields, apparently ruling out the possibility of ferroelectric switching. Read More

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Visible-light-driven dynamic cancer therapy and imaging using graphitic carbon nitride nanoparticles.

Mater Sci Eng C Mater Biol Appl 2018 Sep 16;90:531-538. Epub 2018 Apr 16.

Department of Biological Engineering, Biohybrid Systems Research Center (BSRC), Inha University, 100, Inha-ro, Incheon 22212, Republic of Korea. Electronic address:

Organic graphitic carbon nitride nanoparticles (NP-g-CN), less than 30 nm in size, were synthesized and evaluated for photodynamic therapy (PDT) and cell imaging applications. NP-g-CN particles were prepared through an intercalation process using a rod-like melamine-cyanuric acid adduct (MCA) as the molecular precursor and a eutectic mixture of LiCl-KCl (45:55 wt%) as the reaction medium for polycondensation. The nano-dimensional NP-g-CN penetrated the malignant tumor cells with minimal hindrance and effectively generated reactive oxygen species (ROS) under visible light irradiation, which could ablate cancer cells. Read More

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September 2018

Highly Tough Bioinspired Ternary Hydrogels Synergistically Reinforced by Graphene/Xonotlite Network.

Small 2018 05 30;14(22):e1800673. Epub 2018 Apr 30.

Division of Nanomaterials and Chemistry, Hefei National Research Center for Physical Sciences at the Microscale, CAS Center for Excellence in Nanoscience, Hefei Science Center of CAS, Collaborative Innovation Center of Suzhou Nano Science and Technology, Department of Chemistry, University of Science and Technology of China, Hefei, 230026, China.

The application fields of hydrogels are often severely limited by their weak mechanical performance. It is therefore highly demanded to develop an effective strategy to fabricate mechanically strong hydrogels. Herein, a kind of bioinspired ternary hydrogel consisting of graphene oxide (GO) nanosheets, xonotlite nanowires, and polyacrylamide (PAM) is constructed under the synergy of hydrogen bonding-induced GO/xonotlite network and the penetrated PAM chain network. Read More

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Construction of polyacrylamide/graphene oxide/gelatin/sodium alginate composite hydrogel with bioactivity for promoting Schwann cells growth.

J Biomed Mater Res A 2018 07 10;106(7):1951-1964. Epub 2018 Apr 10.

Key Laboratory of Neuroregeneration, Ministry of Education, Nantong University, Nantong, 226001, People's Republic of China.

Various hydrogels made from natural or synthetic polymers have been widely used in biologic tissues, drug delivery, and artificial implants due to their good biocompatibility, indicating a promising perspective in regenerative medicine. In the present study, a composite hydrogel named polyacrylamide/graphene oxide/gelatin/sodium alginate (PAM/GO/Gel/SA) for accelerating peripheral nerve regeneration was fabricated through in situ free radical polymerization for the first time. A series of physicochemical properties including morphology, porosity, swelling behaviors, component, mechanical properties, and in vitro degradation behavior of the prepared composite hydrogel were characterized. Read More

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Li-Desolvation Dictating Lithium-Ion Battery's Low-Temperature Performances.

ACS Appl Mater Interfaces 2017 Dec 28;9(49):42761-42768. Epub 2017 Nov 28.

Energy and Environmental Directorate, Pacific Northwest National Laboratory , 902 Battelle Boulevard, Richland, Washington 99354, United States.

Lithium (Li) ion battery has penetrated almost every aspect of human life, from portable electronics, vehicles, to grids, and its operation stability in extreme environments is becoming increasingly important. Among these, subzero temperature presents a kinetic challenge to the electrochemical reactions required to deliver the stored energy. In this work, we attempted to identify the rate-determining process for Li migration under such low temperatures, so that an optimum electrolyte formulation could be designed to maximize the energy output. Read More

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December 2017

Carbon encapsulated nanoscale iron/iron-carbide/graphite particles for EMI shielding and microwave absorption.

Phys Chem Chem Phys 2017 Aug;19(34):23268-23279

Materials Research Centre, Indian Institute of Science, Bangalore, 560012, India.

Homogenously dispersed nanoparticles having a magnetic core and graphitic-carbon shells in amorphous carbon globules are prepared using a low-cost pyrolysis technique. Synergetic microwave absorption in carbon globules embedded with nanoscale iron/iron-carbide graphite (FeC) particles via dielectric, magnetic and Ohmic losses is emphasized in this work. The electromagnetic interference (EMI) shielding properties of the FeC nanoparticles dispersed in polyvinylidene fluoride (PVDF) are studied in the 8-18 GHz frequency range and compared with those of PVDF composites containing similar weight fractions of conducting/magnetic phase micro-particles such as carbonyl iron (CI) or electrolytic iron (EI) or a similar amount of amorphous carbon phase such as amorphous carbon (a-C) globules. Read More

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Novel impacts of functionalized multi-walled carbon nanotubes in plants: promotion of nodulation and nitrogenase activity in the rhizobium-legume system.

Nanoscale 2017 Jul;9(28):9921-9937

State Key Laboratory of Agricultural Microbiology, College of Life Science and Technology and College of Science, Huazhong Agricultural University, Wuhan, 430070, PR China.

The rhizobium-legume symbiosis system is critical for nitrogen-cycle balance in agriculture. However, the potential effects of carbon nanomaterials (CNMs) on this system remain largely unknown. Herein, we studied the effects of four carbon-based materials (activated carbon (AC), single-walled carbon nanotubes (SWCNTs), multi-walled carbon nanotubes (MWCNTs) and graphene oxide (GO)) on the rhizobium-legume symbiosis system consisting of Lotus japonicus and Mesorhizobium loti MAFF303099. Read More

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The collision of a hypervelocity massive projectile with free-standing graphene: Investigation of secondary ion emission and projectile fragmentation.

J Chem Phys 2017 Feb;146(5):054305

Department of Chemistry, Texas A&M University, College Station, Texas 77843-3144, USA.

We present here the study of the individual hypervelocity massive projectiles (440-540 keV, 33-36 km/s Au cluster) impact on 1-layer free-standing graphene. The secondary ions were detected and recorded separately from each individual impact in the transmission direction using a time-of-flight mass spectrometer. We observed C ions emitted from graphene, the projectiles which penetrated the graphene, and the Au fragment ions in mass spectra. Read More

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February 2017

The Penetrated Delivery of Drug and Energy to Tumors by Lipo-Graphene Nanosponges for Photolytic Therapy.

ACS Nano 2016 Oct 3;10(10):9420-9433. Epub 2016 Oct 3.

Department of Biomedical Engineering and Environmental Sciences, National Tsing Hua University , Hsinchu 300, Taiwan.

Delivery of drug and energy within responsive carriers that effectively target and accumulate in cancer cells promises to mitigate side effects and to enhance the uniquely therapeutic efficacy demanded for personalized medicine. To achieve this goal, however, these carriers, which are usually piled up at the periphery of tumors near the blood vessel, must simultaneously overcome the challenges associated with low tumor penetration and the transport of sufficient cargos to deep tumors to eradicate whole cancer cells. Here, we report a sponge-like carbon material on graphene nanosheet (graphene nanosponge)-supported lipid bilayers (lipo-GNS) that doubles as a photothermal agent and a high cargo payload platform and releases a burst of drug/energy (docetaxel (DTX) and gasified perfluorohexane (PFH)) and intense heat upon near-infrared irradiation. Read More

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October 2016

A nano-sandwich construct built with graphene nanosheets and carbon nanotubes enhances mechanical properties of hydroxyapatite-polyetheretherketone scaffolds.

Int J Nanomedicine 2016 28;11:3487-500. Epub 2016 Jul 28.

State Key Laboratory of High Performance Complex Manufacturing.

A nano-sandwich construct was built by combining two-dimensional graphene nanosheets (GNSs) and one-dimensional carbon nanotubes (CNTs) to improve the mechanical properties of hydroxyapatite-polyetheretherketone (HAP-PEEK) scaffolds for bone tissue engineering. In this nano-sandwich construct, the long tubular CNTs penetrated the interlayers of graphene and prevented their aggregation, increasing the effective contact area between the construct and matrix. The combination of GNSs and CNTs in a weight ratio of 2:8 facilitated the dispersion of each other and provided a synergetic effect in enhancing the mechanical properties. Read More

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February 2017

Reduced Graphene-Wrapped MnO2 Nanowires Self-Inserted with Co3 O4 Nanocages: Remarkable Enhanced Performances for Lithium-Ion Anode Applications.

Chemistry 2016 05 13;22(20):6876-80. Epub 2016 Apr 13.

State Key Laboratory of Rare Earth Resource Utilization, Changchun Institute of Applied Chemistry, Chinese Academy of Science, Changchun, 130022, P. R. China.

A simple synthetic approach for graphene-templated nanostructured MnO2 nanowires self-inserted with Co3 O4 nanocages is proposed in this work. The Co3 O4 nanocages were penetrated in situ by MnO2 nanowires. As an anode, the as-obtained MnO2 -Co3 O4 -RGO composite exhibits remarkable enhanced performance compared with the MnO2 -RGO and Co3 O4 -RGO samples. Read More

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Specific nanotoxicity of graphene oxide during zebrafish embryogenesis.

Nanotoxicology 2016 23;10(1):42-52. Epub 2015 Feb 23.

a Key Laboratory of Pollution Processes and Environmental Criteria (Ministry of Education) , Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai University , Tianjin , China.

Graphene oxide (GO) has shown great potential for biological, medical, energy and electronic applications. As a consequence of these diverse applications, GO release into the ecosystem is inevitable; however, the corresponding risks are largely unknown, particularly with respect to the critical period of embryogenesis. This study revealed that GO adhered to and enveloped the chorion of zebrafish embryos mainly via hydroxyl group interactions, blocked the pore canals of the chorionic membrane, and caused marked hypoxia and hatching delay. Read More

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October 2016

The thinnest molecular separation sheet by graphene gates of single-walled carbon nanohorns.

Authors:
Tomonori Ohba

ACS Nano 2014 Nov 27;8(11):11313-9. Epub 2014 Oct 27.

Graduate School of Science, Chiba University , 1-33 Yayoi, Inage, Chiba, Chiba 263-8522, Japan.

Graphene is possibly the thinnest membrane that could be used as a molecular separation gate. Several techniques including absorption, cryogenic distillation, adsorption, and membrane separation have been adopted for constructing separation systems. Molecular separation using graphene as the membrane has been studied because large area synthesis of graphene is possible by chemical vapor deposition. Read More

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November 2014

Near-infrared light-responsive nanomaterials in cancer therapeutics.

Chem Soc Rev 2014 Sep;43(17):6254-87

Institute of Nano Science & Technology, Habitat Centre, Phase-X, Sector-64, Mohali, Punjab-160062, India.

Noninvasive techniques, such as breath tests (urea breath test), blood pressure measurements using a sphygmomanometer and electrocardiography, were employed by a physician to perform classical diagnosis. The use of state-of-the-art noninvasive therapies at the organ level in modern medicine has gradually become possible. However, cancer treatment demands spatially and temporally controlled noninvasive therapy at the cell level because nonspecific toxicity often causes complicated side effects. Read More

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September 2014

Graphene nanoplatelets spontaneously translocate into the cytosol and physically interact with cellular organelles in the fish cell line PLHC-1.

Aquat Toxicol 2014 May 2;150:55-65. Epub 2014 Mar 2.

Instituto Nacional de Investigación y Tecnología Agraria y Alimentaria (INIA), Departamento de Medio Ambiente, Carretera de la Coruña Km 7.5, Madrid 28040, Spain. Electronic address:

Graphene and graphene derivatives constitute a novel class of carbon-based nanomaterials being increasingly produced and used in technical and consumer applications. Release of graphene nanoplatelets during the life cycle of these applications may result in human and environmental exposure calling for assessment of their potential to cause harm to humans and wildlife. This study aimed to assess the toxicity of graphene oxide (GO) and carboxyl graphene (CXYG) nanoplatelets to non-mammalian species using the fish cell line PLHC-1 as in vitro model. Read More

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A late-onset seizure due to a retained intracranial foreign body--pencil lead: a case report and review.

Authors:
Qian Chunhua Wu Qun

J Craniofac Surg 2014 ;25(2):e109-10

From the Department of Neurosurgery, the Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, People's Republic of China.

A 40-year-old man presented with recent recurrent seizures. He was operated on to resect the right temporal mass with a foreign body, a pencil lead. The foreign body had entered the brain parenchyma for an accident in a child without apparent head injury, sustained for 30 years. Read More

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October 2015

1-Dimensional AgVO3 nanowires hybrid with 2-dimensional graphene nanosheets to create 3-dimensional composite aerogels and their improved electrochemical properties.

Nanoscale 2014 Apr;6(7):3536-9

State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100 029, PR China.

Three-dimensional (3D) porous composite aerogels have been synthesized via an innovative in situ hydrothermal method assisted by a freeze-drying process. In this hybrid structure, one-dimensional (1D) AgVO3 nanowires are uniformly dispersed on two-dimensional (2D) graphene nanosheet surfaces and/or are penetrated through the graphene sheets, forming 3D porous composite aerogels. As cathode materials for lithium-ion batteries, the composite aerogels exhibit high discharge capacity, excellent rate capability, and good cycling stability. Read More

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