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graphene oxide

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https://www.readbyqxmd.com/read/28545193/synthesis-characterization-and-cytotoxic-evaluation-of-graphene-oxide-nanosheets-in-vitro-liver-cancer-model
#1
Samah A Loutfy, Taher A Salaheldin, Marwa A Ramadan, Khaled Yehia Farroh, Zeinab F Abdallah, Tareq Youssef Abd Eloahed
Background: Graphene nanosheets have a broad spectrum of biomedical applications. Hepatocellular cancer (HCC) is a major health problem in the Egyptian population. Currently, treatment strategies are invasive and have several adverse side effects. Thus, other approaches are required for managing this aggressive type of cancer. Our objective here was to prepare and characterize graphene oxide nanosheets and evaluate cytotoxic effect at the molecular level in an in vitro human liver cancer cell model (HepG2)...
April 1, 2017: Asian Pacific Journal of Cancer Prevention: APJCP
https://www.readbyqxmd.com/read/28544800/reinforced-microextraction-of-polycyclic-aromatic-hydrocarbons-from-polluted-soil-samples-using-an-in-needle-coated-fiber-with-polypyrrole-graphene-oxide-nanocomposite
#2
Mina Behfar, Ali Reza Ghiasvand, Fatemeh Yazdankhah
The surface of a stainless-steel wire was platinized using electrophoretic deposition method to create a high-surface-area, porous and cohesive substrate. The platinized fiber was coated by the polypyrrole/graphene oxide nanocomposite by electropolymerization and accommodated into a stainless-steel needle to fabricate an in-needle coated fiber. The developed setup was coupled to gas chromatography with flame ionization detection and applied to extract and determine polycyclic aromatic hydrocarbons (naphthalene, fluorene, phenanthrene, fluoranthene and pyrene) in complicated solid matrices, along with reinforcement of the extraction by cooling the sorbent, using liquid carbon dioxide...
May 25, 2017: Journal of Separation Science
https://www.readbyqxmd.com/read/28544680/multiscale-modulation-of-nanocrystalline-cellulose-hydrogel-via-nanocarbon-hybridization-for-3d-neuronal-bilayer-formation
#3
Dongyoon Kim, Subeom Park, Insu Jo, Seong-Min Kim, Dong Hee Kang, Sung-Pyo Cho, Jong Bo Park, Byung Hee Hong, Myung-Han Yoon
Bacterial biopolymers have drawn much attention owing to their unconventional three-dimensional structures and interesting functions, which are closely integrated with bacterial physiology. The nongenetic modulation of bacterial (Acetobacter xylinum) cellulose synthesis via nanocarbon hybridization, and its application to the emulation of layered neuronal tissue, is reported. The controlled dispersion of graphene oxide (GO) nanoflakes into bacterial cellulose (BC) culture media not only induces structural changes within a crystalline cellulose nanofibril, but also modulates their 3D collective association, leading to substantial reduction in Young's modulus (≈50%) and clear definition of water-hydrogel interfaces...
May 22, 2017: Small
https://www.readbyqxmd.com/read/28544611/detection-of-nitric-oxide-from-living-cells-using-polymeric-zinc-organic-framework-derived-zinc-oxide-composite-with-conducting-polymer
#4
Min-Yeong Kim, Malenahalli Halappa Naveen, Nanjanagudu Ganesh Gurudatt, Yoon-Bo Shim
Sensitive and selective detection of nitric oxide (NO) in the human body is crucial since it has the vital roles in the physiological and pathological processes. This study reports a new type of electrochemical NO biosensor based on zinc-dithiooxamide framework derived porous ZnO nanoparticles and polyterthiophene-rGO composite. By taking advantage of the synergetic effect between ZnO and poly(TTBA-rGO) (TTBA = 3'-(p-benzoic acid)-2,2':5',2″-terthiophene, rGO = reduced graphene oxide) nanocomposite layer, the poly(TTBA-rGO)/ZnO sensor probe displays excellent electrocatalytic activity and explores to detect NO released from normal and cancer cell lines...
May 22, 2017: Small
https://www.readbyqxmd.com/read/28543831/selective-bromination-of-graphene-oxide-by-hunsdiecker-reaction
#5
Ondrej Jankovsky, Michal Lojka, Jan Luxa, David Sedmidubsky, Ondrej Tomanec, Radek Zboril, Martin Pumera, Zdenek Sofer
Halogenated graphenes have been attracting great attention in the recent years. The currently used methods are usually non-specific and halogen groups are randomly distributed over the graphene surface. The selective functionalization based on well known reaction mechanism allowed selective functionalization of graphene sheets. We show the application of Hunsdicker based reaction on the graphene oxide for selective bromination of graphene oxide. The chemical analysis using various spectroscopic methods proved a highly effective functionalization...
May 22, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28543094/mechanism-of-graphene-induced-cytotoxicity-role-of-endonucleases
#6
Tariq Fahmi, La Donna Branch, Zeid A Nima, Dae Song Jang, Alena V Savenka, Alexandru S Biris, Alexei G Basnakian
Graphene, a crystalline allotrope or carbon, presents numerous useful properties; however, its toxicity is yet to be determined. One of the most dramatic and irreversible toxic abilities of carbon nanomaterials is the induction of DNA fragmentation produced by endogenous cellular endonucleases. This study demonstrated that pristine graphene exposed to cultured kidney tubular epithelial cells is capable of inducing DNA fragmentation measured by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay, which is usually associated with cell death...
May 24, 2017: Journal of Applied Toxicology: JAT
https://www.readbyqxmd.com/read/28541948/attached-%C3%AE-cyclodextrin-%C3%AE-2-3-epoxypropoxy-propyl-trimethoxysilane-to-graphene-oxide-and-its-application-in-copper-removal
#7
Zongxue Yu, Qi Chen, Liang Lv, Yang Pan, Guangyong Zeng, Yi He
The environmental applications of graphene oxide and β-cyclodextrin (β-CD) have attracted great attention since their first discovery. Novel nanocomposites were successfully prepared by using an esterification reaction between β-cyclodextrin/γ-(2,3-epoxypropoxy) propyl trimethoxysilane grafted graphene oxide (β-CD/GPTMS/GO). The β-CD/GPTMS/GO nanocomposites were used to remove the Cu(2+) from aqueous solutions. The characteristics of β-CD/GPTMS/GO were detected by scanning electron microscopy (SEM), Fourier transform infrared, X-ray diffraction (XRD), thermogravimetric analysis (TG) and energy dispersive X-ray (EDX)...
May 2017: Water Science and Technology: a Journal of the International Association on Water Pollution Research
https://www.readbyqxmd.com/read/28540865/directed-growth-of-graphene-nanomesh-in-purified-argon-via-chemical-vapor-deposition
#8
Haibin Sun, Can Fu, Xia Shen, Wenchao Yang, Pengfei Guo, Yang Lu, Yongsong Luo, Benhai Yu, Xiaoge Wang, Chunlei Wang, Junqi Xu, Jiangfeng Liu, Fengqi Song, Guanghou Wang, Jianguo Wan
Graphene nanomeshes (GNMs), new graphene nanostructures with tunable bandgaps, are potential building blocks for future electronic or photonic devices, and energy storage and conversion materials. In previous works, GNMs have been successfully prepared on Cu foils by the H2 etching effect. In this paper, we investigated the effect of Ar on the preparation of GNMs, and how the mean density and shape of them vary with growth time. In addition, scanning electron microscopy (SEM) and high resolution transmission electron microscopy (TEM) revealed the typical hexagonal structure of GNM...
June 16, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28540792/a-computational-study-on-the-usability-of-amino-acid-functionalised-nitrogen-doped-graphene-oxides-as-temperature-responsive-drug-delivery-systems
#9
Rahim Ghadari, Ashkan Kashefi
The usability of amino acid-functionalised nitrogen-doped graphene oxide (GO) structures (AA-NGO) in drug delivery (DD) systems was studied using the computational approaches. Docking, molecular dynamic (MD) and molecular mechanics generalised born surface area studies were carried out. The calculations were done at 37 and 42 °C to study the usability of the mentioned structures in thermally induced DD systems. In this method, the drug is released by increasing the temperature. For the representative cases, studies at 32, 37, 42 and 47 °C were carried out, as well...
April 3, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28537732/rapid-flame-synthesis-of-atomically-thin-moo3-down-to-monolayer-thickness-for-effective-hole-doping-of-wse2
#10
Lili Cai, Connor J McClellan, Ai Leen Koh, Hong Li, Eilam Yalon, Eric Pop, Xiaolin Zheng
Two-dimensional (2D) molybdenum trioxide (MoO3) with mono- or few-layer thickness can potentially advance many applications, ranging from optoelectronics, catalysis, sensors, and batteries to electrochromic devices. Such ultrathin MoO3 sheets can also be integrated with other 2D materials (e.g., as dopants) to realize new or improved electronic devices. However, there is lack of a rapid and scalable method to controllably grow mono- or few-layer MoO3. Here, we report the first demonstration of using a rapid (<2 minutes) flame synthesis method to deposit mono- and few-layer MoO3 sheets (several microns in lateral dimension) on a wide variety of layered materials, including mica, MoS2, graphene and WSe2, based on van der Waals epitaxy...
May 24, 2017: Nano Letters
https://www.readbyqxmd.com/read/28537405/in-situ-grown-fe2o3-single-crystallites-on-reduced-graphene-oxide-nanosheets-as-high-performance-conversion-anode-for-sodium-ion-batteries
#11
Ting Li, Aiqiong Qin, Lanlan Yang, Jie Chen, Qiufan Wang, Daohong Zhang, Hanxi Yang
Electrochemical conversion reactions of metal oxides provide a new avenue to build high capacity anodes for sodium-ion batteries. However, the poor rate performance and cyclability of these conversion anodes remain a significant challenge for Na-ion battery applications because the most of conversion anodes suffer from sluggish kinetics and irreversible structural change during cycles. In this paper, we report a Fe2O3 single crystallites/reduced graphene oxide composite (Fe2O3/rGO), where the Fe2O3 single crystallites with a particle size of ~300 nm were uniformly anchored on the rGO nanosheets, which provide a highly conductive framework to facilitate electron transport and a flexible matrix to buffer the volume change of the material during cycling...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28537372/a-facile-co-electrodeposition-method-for-high-performance-supercapacitor-based-on-reduced-graphene-oxide-polypyrrole-composite-film
#12
Junchen Chen, Yaming Wang, Jianyun Cao, Yan Liu, Yu Zhou, Jia-Hu Ouyang, Dechang Jia
A facile co-electrodeposition method has been developed to fabricate reduced graphene oxide/polypyrrole (rGO/PPy) composite films with sodium dodecyl benzene sulfonate (SDBS) as both surfactant and supporting electrolyte in the precursor solution. The introduction of rGO into the PPy films forms porous structure and enhances the conductivity across the film, leading to superior electrochemical performance. By controlling the deposition time and the rGO concentration, the highest area capacitance can reach 411 mF/cm2 (0...
May 24, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28537307/microwave-absorbing-property-optimization-of-starlike-zno-reduced-graphene-oxide-doped-by-zno-nanocrystal-composites
#13
Wei Feng, Yaming Wang, Junchen Chen, Lixin Guo, Jiahu Ouyang, Dechang Jia, Yu Zhou
This study constructs a unique structure of reduced graphene oxide (RGO)/ZnO composite combining starlike ZnO with RGO doped by ZnO nanocrystals through an in situ crystallization method. After mixing graphene oxide (GO) dispersion with Zn(NO3)2 and KOH solution, zinc ions absorbed on graphene oxide sheets transform ZnO nanocrystals, and the free zinc ions form starlike ZnO. After thermal treatment, RGO sheets doped by uniformly dispersed ZnO nanocrystals wrap the starlike ZnO or insert in the gap between them...
May 24, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28535481/graphene-oxide-enzyme-hybrid-nanoflowers-for-efficient-water-soluble-dye-removal
#14
Hui Li, Jingwei Hou, Linlin Duan, Chao Ji, Yatao Zhang, Vicki Chen
High efficient enzyme immobilization on carbon based conductive supports could provide wide applications in energy and environmental science. Here, we synthesized a 3D flower-like structured self-assembly hybrid nanocomposite with copper phosphate, laccase, graphite oxide (GO) and carbon nanotubes (CNTs) via a facile one-pot strategy under mild conditions. The prepared nanocomposite exhibited very high enzyme loading and improved laccase activity. During the formation of the nanocomposite, the copper phosphate-laccase petals were interwined by CNTs, and GO nanosheets were further coated on the petal surface...
May 11, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28535479/adsorption-of-vocs-onto-engineered-carbon-materials-a-review
#15
REVIEW
Xueyang Zhang, Bin Gao, Anne Elise Creamer, Chengcheng Cao, Yuncong Li
Volatile organic compounds (VOCs) severely threaten human health and the ecological environment because most of them are toxic, mutagenic, and carcinogenic. The persistent increase of VOCs together with the stringent regulations make the reduction of VOC emissions more imperative. Up to now, numerous VOC treatment technologies have emerged, such as incineration, condensation, biological degradation, absorption, adsorption, and catalysis oxidation et al. Among them, the adsorption technology has been recognized as an efficient and economical control strategy because it has the potential to recover and reuse both adsorbent and adsorbate...
May 12, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/28535471/graphene-oxide-supported-carbon-nanofiber-like-network-derived-from-polyaniline-a-novel-composite-for-enhanced-glucose-oxidase-bioelectrode-performance
#16
Zepeng Kang, Kailong Jiao, Xinping Xu, Ruiyun Peng, Shuqiang Jiao, Zongqian Hu
A three-dimensional architecture of PANI@GO hybrid was synthesized via in-situ polymerization of aniline monomers on the surface of graphene oxide (GO) and carbonized at 1600°C. The SEM images showed that surfaces of planar GO were covered by a compact nanofiber-like polyaniline (PANI) layer which presented an interconnected network. Nanofiber-like PANI on the GO surface was mostly preserved and became the carbon nanofibers (CNFs) after carbonization. The TEM images showed that the carbonized PANI grew seamlessly on the GO surface and served as conductive "network" between interlayers of GO...
May 12, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28535338/a-flexible-lithium-ion-fiber-battery-by-regularly-stacking-two-dimensional-titanium-oxide-nanosheets-hybridized-with-reduced-graphene-oxide
#17
Tatsumasa Hoshide, Yuanchuan Zheng, Junyu Hou, Zhiqiang Wang, Qingwen Li, Zhigang Zhao, Renzhi Ma, Takayoshi Sasaki, Fengxia Geng
Increasing interest has recently been devoted to developing small, rapid, and portable electronic devices; thus, it is becoming critically important to provide matching light and flexible energy-storage systems to power them. To this end, compared with the inevitable drawbacks of being bulky, heavy, and rigid for traditional planar sandwiched structures, linear fiber-shaped lithium-ion batteries (LIB) have become increasingly important owing to their combined superiorities of miniaturization, adaptability, and weavability, the progress of which is heavily dependent on developing new fiber-shaped electrodes...
May 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28535068/conformal-lithium-fluoride-protection-layer-on-three-dimensional-lithium-by-nonhazardous-gaseous-reagent-freon
#18
Dingchang Lin, Yayuan Liu, Wei Chen, Guangmin Zhou, Kai Liu, Bruce Dunn, Yi Cui
Research on lithium (Li) metal chemistry has been rapidly gaining momentum nowadays not only because of the appealing high theoretical capacity, but also its indispensable role in the next-generation Li-S and Li-air batteries. However, two root problems of Li metal, namely high reactivity and infinite relative volume change during cycling, bring about numerous other challenges that impede its practical applications. In the past, extensive studies have targeted these two root causes by either improving interfacial stability or constructing a stable host...
May 25, 2017: Nano Letters
https://www.readbyqxmd.com/read/28535030/sulfonated-holey-graphene-oxide-shgo-filled-sulfonated-poly-ether-ether-ketone-membrane-the-role-of-holes-in-the-shgo-in-improving-its-performance-as-proton-exchange-membrane-for-direct-methanol-fuel-cells
#19
Zhong-Jie Jiang, Zhongqing Jiang, Xiaoning Na Tian, Lijuan Luo, Meilin Liu
Sulfonated holey graphene oxides (SHGOs) have synthesized by the etching of sulfonated graphene oxides with concentrated HNO3 under the assistance of ultrasonication. These SHGOs could be used as the fillers for the sulfonated aromatic poly(ether ether ketone) (SPEEK) membrane. The obtained SHGO incorporated SPEEK membrane has a uniform and dense structure, exhibiting the higher performance as proton exchange membranes (PEMs), for instance, higher proton conductivity, lower activation energy for proton conduction, and comparable methanol permeability, as compared to Nafion® 112...
May 23, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28534904/porous-copper-graphene-heterostructures-for-cooling-of-electronic-devices
#20
Hokyun Rho, Yea Sol Jang, Sungmin Kim, Sukang Bae, Tae-Wook Kim, Dong Su Lee, Jun-Seok Ha, Sang Hyun Lee
Recently, research on micro-electronic and optoelectronic devices has been rapidly increasing. Parts and products related to these devices are becoming smaller and more integrated within circuits. As a result, the heat generated in devices has increased greatly. When excess heat is generated, important properties are affected such as efficiency and lifetime and, in severe cases, this can result in the failure of devices. Therefore, efficient cooling is required and it becomes necessary to study the heat dissipation properties of device materials...
May 23, 2017: Nanoscale
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