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https://www.readbyqxmd.com/read/28806655/magnetic-reduced-graphene-oxide-loaded-hydrogels-highly-versatile-and-efficient-adsorbents-for-dyes-and-selective-cr-vi-ions-removal
#1
Fatima Halouane, Yavuz Oz, Dalila Meziane, Alexandre Barras, Jean Juraszek, Santosh K Singh, Sreekumar Kurungot, Pankaj K Shaw, Rana Sanyal, Rabah Boukherroub, Amitav Sanyal, Sabine Szunerits
The formation of composites of reduced graphene oxide (rGO) and magnetic nanoparticles (MP) has flourished in recent years as they combine the advantages of both nanomaterials. Most of these composite materials are prepared by in situ formation of MP onto rGO or by the post-adsorption onto rGO. We report here on a simple and highly controlled method for the fabrication of different magnetic 3D rGO-loaded hydrogels. Cellulose bound magnetic nanoparticles (MP@cellulose) were synthesized by chemical co-precipitation and loaded together with rGO into poly(ethylene glycol) dimethacrylate based hydrogels during their fabrication using photo-polymerization...
July 28, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28806526/highly-selective-self-powered-sensing-platform-for-p-nitrophenol-detection-constructed-with-a-photocathode-based-photocatalytic-fuel-cell
#2
Kai Yan, Yaohua Yang, Yuhan Zhu, Jingdong Zhang
A photocathode-based photocatalytic fuel cell (PFC) was fabricated and proposed as a self-powered sensor for p-nitrophenol (p-NP) detection. The PFC was comprised of a photocathode and an anode in separated chambers, which could generate suitable power output under photoirradiation to drive the sensing process. In this device, p-type PbS quantum dots-modified glass carbon electrode (GCE) served as the photocathode for the reduction of p-NP under photoirradiation while graphene-modified GCE was employed as the anode for the oxidation of ascorbic acid...
August 14, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28806511/understanding-and-reducing-photo-thermal-forces-for-the-fabrication-of-au-nanoparticle-dimers-by-optical-printing
#3
Julian Gargiulo, Thomas Brick, Ianina L Violi, Facundo C Herrera, Toshihiko Shibanuma, Pablo Albella, Emiliano Cortes, Felix G Requejo, Stefan A Maier, Fernando D Stefani
Optical printing holds great potential to enable the use of the vast variety of colloidal nanoparticles (NPs) in nano- and micro- devices and circuits. By means of optical forces, it enables the direct assembly of NPs, one by one, onto specific positions of solid surfaces with great flexibility of pattern design and no need of previous surface patterning. However, for unclear causes it was not possible to print NPs closer to each other than 300 nm. Here, we show that the repulsion restricting the optical printing of close by NPs arises from light absorption by the printed NPs and consequent local heating...
August 14, 2017: Nano Letters
https://www.readbyqxmd.com/read/28805655/transfer-of-cvd-grown-graphene-for-room-temperature-gas-sensors
#4
Federica Rigoni, Rishi Maiti, Camilla Baratto, Maurizio Donarelli, Jennifer MacLeod, Bahrati Gupta, Mei Lyu, Andrea Ponzoni, Giorgio Sberveglieri, Nunzio Motta, Guido Faglia
An easy transfer procedure to obtain graphene-based gas sensing devices operating at room temperature is presented. Starting from chemical vapor deposition (CVD)-grown graphene on copper foil, we obtained single layer graphene which could be transferred onto arbitrary substrates. In particular, we placed single layer graphene on top of a SiO<sub>2</sub>/Si substrate with pre-patterned Pt electrodes to realize a chemiresistor gas sensor able to operate at room temperature. The responses to ammonia (10, 20, 30 ppm) and nitrogen dioxide (1, 2, 3 ppm) are shown at different values of relative humidity, in dark and under 254 nm UV light...
August 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28805649/aging-resistant-nanofluids-containing-covalent-functionalized-boron-nitride-nanosheets
#5
Dongju Lee, Jin-Ju Park, Min-Ku Lee, Gyoung-Ja Lee
Developing a thermally stable nanofluid that can maintain good thermo-conductive and flow performance at moderate or elevated temperatures for prolonged periods of time is a great challenge in heat transfer applications. Here, the thermal conductivity and rheological properties as well as their thermal stability characteristics of a nanofluid containing two-dimensional (2D) hexagonal boron nitride nanosheets (h-BNNSs) in ethylene glycol (EG) are presented, in comparison with those for a graphene oxide (GO) nanofluid as a counterpart...
August 14, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28804961/gaseous-nanocarving-mediated-carbon-framework-with-spontaneous-metal-assembly-for-structure-tunable-metal-carbon-nanofibers
#6
Dae-Hyun Nam, Sungwoo Lee, Young-Joo Lee, Jun-Hyun Jo, Euijoon Yoon, Kyung-Woo Yi, Gun-Do Lee, Young-Chang Joo
Vapor phase carbon (C)-reduction-based syntheses of C nanotubes and graphene, which are highly functional solid C nanomaterials, have received extensive attention in the field of materials science. This study suggests a revolutionary method for precisely controlling the C structures by oxidizing solid C nanomaterials into gaseous products in the opposite manner of the conventional approach. This gaseous nanocarving enables the modulation of inherent metal assembly in metal/C hybrid nanomaterials because of the promoted C oxidation at the metal/C interface, which produces inner pores inside C nanomaterials...
August 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28804931/amorphous-bimetallic-oxide-graphene-hybrids-as-bifunctional-oxygen-electrocatalysts-for-rechargeable-zn-air-batteries
#7
Li Wei, H Enis Karahan, Shengli Zhai, Hongwei Liu, Xuncai Chen, Zheng Zhou, Yaojie Lei, Zongwen Liu, Yuan Chen
Metal oxides of earth-abundant elements are promising electrocatalysts to overcome the sluggish oxygen evolution and oxygen reduction reaction (OER/ORR) in many electrochemical energy-conversion devices. However, it is difficult to control their catalytic activity precisely. Here, a general three-stage synthesis strategy is described to produce a family of hybrid materials comprising amorphous bimetallic oxide nanoparticles anchored on N-doped reduced graphene oxide with simultaneous control of nanoparticle elemental composition, size, and crystallinity...
August 14, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28804530/evolution-of-reduced-graphene-oxide-sns2-hybrid-nanoparticle-electrodes-in-li-ion-batteries
#8
Mohammad H Modarres, Jonathan Hua-Wei Lim, Chandramohan George, Michael De Volder
Hybrid nanomaterials where active battery nanoparticles are synthesized directly onto conductive additives such as graphene hold the promise of improving the cyclability and energy density of conversion and alloying type Li-ion battery electrodes. Here we investigate the evolution of hybrid reduced graphene oxide-tin sulfide (rGO-SnS2) electrodes during battery cycling. These hybrid nanoparticles are synthesized by a one-step solvothermal microwave reaction which allows for simultaneous synthesis of the SnS2 nanocrystals and reduction of GO...
June 22, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28803107/conversion-of-lipids-from-wet-microalgae-into-biodiesel-using-sulfonated-graphene-oxide-catalysts
#9
Jun Cheng, Yi Qiu, Jie Zhang, Rui Huang, Weijuan Yang, Zhentao Fan
Four solid acid catalysts including graphene oxide (GO), sulfonated graphene oxide (SGO), sulfonated graphene (SG), and sulfonated active carbon (SAC) were used to convert lipids in wet microalgae into biodiesel. The physiochemical properties of the catalysts were characterized with scanning electron microscope, X-ray diffraction, and thermogravimetric analysis. SGO provided the highest conversion efficiency (84.6% of sulfuric acid) of lipids to fatty acid methyl esters (FAME). Whereas SAC converted few lipids into FAME...
July 27, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28803028/novel-poly-l-lactide-graphene-oxide-films-with-improved-mechanical-flexibility-and-antibacterial-activity
#10
Zhijun Yang, Chen Sun, Liang Wang, Huixin Chen, Ji He, Yuan Chen
Poly(l-lactic acid) (PLLA) is a biocompatible polyester derived from renewable sources. It is desirable to reduce its brittleness and introduce antibacterial activity for biomedical applications by using graphene oxide (GO) as a structural and antibacterial agent. However, commonly used polymer/GO composite synthesis methods, such as physical mixing and covalent functionalization, either cause phase segregation or compromise the intrinsic properties of GO. Here, a novel approach is demonstrated to synthesize PLLA/GO films...
August 5, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28802737/multi-biofunctional-polymer-graphene-composite-for-bone-tissue-regeneration-that-elutes-copper-ions-to-impart-angiogenic-osteogenic-and-bactericidal-properties
#11
L R Jaidev, Sachin Kumar, Kaushik Chatterjee
Despite several recent advances, poor vascularization in implanted scaffolds impedes complete regeneration for clinical success of bone tissue engineering. The present study aims to develop a multi-biofunctional nanocomposite for bone tissue regeneration using copper nanoparticle decorated reduced graphene oxide (RGO_Cu) hybrid particles in polycaprolactone (PCL) matrix (PCL/RGO_Cu). X-ray photoelectron spectroscopy and X-ray diffraction confirmed the presence of copper oxides (CuO and Cu2O) on RGO. Thermogravimetric analysis showed that 11...
August 4, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28802197/enhanced-electrochemical-performance-of-nickel-cobalt-oxide-reduced-graphene-oxide-activated-carbon-asymmetric-supercapacitors-by-the-addition-of-a-redox-active-electrolyte
#12
Charmaine Lamiel, Yong Rok Lee, Moo Hwan Cho, Dirk Tuma, Jae-Jin Shim
Supercapacitors are an emerging energy-storage system with a wide range of potential applications. In this study, highly porous nickel-cobalt-oxide@reduced graphene oxide (Ni-Co-O@RGO-s) nanosheets were synthesized as an active material for supercapacitors using a surfactant-assisted microwave irradiation technique. The RGO-modified nanocomposite showed a larger specific area, better conductivity, and lower resistivity than the unmodified nanocomposite because the RGO facilitated faster ion diffusion/transport for improved redox activity...
August 2, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28802177/dna-biosensors-based-on-gold-nanoparticles-modified-graphene-oxide-for-the-detection-of-breast-cancer-biomarkers-for-early-diagnosis
#13
Ayman Ali Saeed, Josep Lluís Acero Sánchez, Ciara K O'Sullivan, Mohammed Nooredeen Abbas
Two different DNA (ERBB2c and CD24c) modified gold nanoparticles and graphene oxide loaded on glassy carbon electrodes were prepared for early detection of breast cancer markers by electrochemical detection of HER2. Comparative study of ERBB2c and CD24c for the detection was carried out. A "sandwich-type" detection strategy was employed in this electrochemical DNA biosensor and its response was measured by amperometric detection. The electrochemical signal enhancement achieved via gold nanoparticles and grapheme oxide system allowed for sensitive detection of the breast cancer biomarker ERBB2 and the control marker CD24...
July 14, 2017: Bioelectrochemistry
https://www.readbyqxmd.com/read/28802133/sorptive-removal-of-ionizable-antibiotic-sulfamethazine-from-aqueous-solution-by-graphene-oxide-coated-biochar-nanocomposites-influencing-factors-and-mechanism
#14
Danlian Huang, Xi Wang, Chen Zhang, Guangming Zeng, Zhiwei Peng, Jin Zhou, Min Cheng, Rongzhong Wang, Zhengxun Hu, Xiang Qin
Significant concerns have been raised over antibiotics pollution in aquatic environments in recent years. In this study, sorption of sulfamethazine (SMT) by novel graphene oxide-coated biochar nanocomposites (GO-BC) based on graphene oxide (GO) with bamboo sawdust biochar (BC) was investigated. In comparison with the original BC, the sorption capacity of GO-BC for SMT increased by 1.14 times. Sorption of SMT onto GO-BC was proved to be dominantly by chemisorption, and Freundlich isotherm described the sorption adequately...
July 31, 2017: Chemosphere
https://www.readbyqxmd.com/read/28801872/new-hybrid-nanocomposite-of-copper-terephthalate-mof-graphene-oxide-synthesis-characterization-and-application-as-adsorbents-for-toxic-metal-ion-removal-from-sungun-acid-mine-drainage
#15
Esmaeil Rahimi, Neda Mohaghegh
The application of a hybrid Cu(tpa).GO (Cu(tpa) copper terephthalate metal organic framework, GO graphene oxide) composite as a new adsorbent for the removal of toxic metal ions was reported. New hybrid nanocomposite with excellent dispersibility and stability was successfully fabricated by the simple and effective ultrasonication method. The synthesized composite was characterized by scanning electron microscopy (SEM), UV-Vis and Fourier-transform infrared (FT-IR) techniques. The characterization results concluded that the binding mechanism of the Cu(tpa) and GO was related to both π-π packing and hydrogen bonding...
August 11, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28801660/bivo4-rgo-with-a-novel-structure-on-steel-fabric-used-as-high-performance-photocatalysts
#16
Dong Fang, Xiujuan Li, Hui Liu, Weilin Xu, Ming Jiang, Wenbin Li, Xin Fan
A high-performance and novel photocatalyst of BiVO4-reduced Graphene Oxide (BiVO4-rGO) nanocomposite was prepared by a facile hydrothermal method. The photocatalyst was characterized by X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, transmission electronic microscopy, UV-Vis diffusion reflectance spectroscopy, photoluminescence spectroscopy and UV-Vis adsorption spectroscopy, respectively. The visible-light photocatalytic activity was evaluated by oxidation of methyl orange (MO) under simulated sunlight irradiation...
August 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28801095/fabrication-of-chitosan-poly-lactic-acid-graphene-oxide-tio2-composite-nanofibrous-scaffolds-for-sustained-delivery-of-doxorubicin-and-treatment-of-lung-cancer
#17
Saman Samadi, Mahboubeh Moradkhani, Hoda Beheshti, Mohammad Irani, Majid Aliabadi
In this work, the synthesized graphene oxide/TiO2/doxorubicin (GO/TiO2/DOX) composites were loaded into the chitosan/poly(lactic acid) (PLA) solutions to fabricate the electrospun chitosan/PLA/GO/TiO2/DOX nanofibrous scaffolds via electrospinning process. The synthesized composites and nanofibers were characterized using X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analysis. Three-factor three-level central composite design was used to determine the influence of PLA to chitosan ratio, TiO2/DOX content and GO/TiO2/DOX content on the release of DOX from nanofibrous scaffolds...
August 8, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28800464/accelerated-biomineralization-of-graphene-oxide-incorporated-cellulose-acetate-nanofibrous-scaffolds-for-mesenchymal-stem-cell-osteogenesis
#18
Xiaoyun Liu, He Shen, Saijie Song, Wei Chen, Zhijun Zhang
For bone tissue engineering, it requires that the scaffolds have excellent biocompatibility, proper mechanical and osteoinductive properties. Electrospun nanofibers with extracellular matrices mimicking structure have proven to be good scaffolds for bone tissue repairing. Hybrid nanofibers in particular, endow the nanofibers with specific and multiple functionalities, and therefore have attracted increasing interests in the recent years. In this study, we fabricated graphene oxide (GO)-incorporated cellulose acetate (CA) nanofibrous scaffolds by electrospinning technique for enhancement of biomineralization and osteogenic differentiation of human mesenchymal stem cells (hMSCs)...
July 29, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28800449/enhanced-adsorption-removal-of-antibiotics-from-aqueous-solutions-by-modified-alginate-graphene-double-network-porous-hydrogel
#19
Yuan Zhuang, Fei Yu, Jie Ma, Junhong Chen
Alginate/graphene double network hydrogel has recently been demonstrated as a promising adsorbent for water pollutants. To improve the adsorption capacity of the double network hydrogel, physical and chemical modifications are made to obtain an excellent porous structure and more functional groups. As-modified alginate/graphene double network hydrogel has a higher hydroxyl group content under a higher polyvinyl alcohol content and a higher carboxyl group content with a higher oxidation degree. Moreover, the CO2 produced by CaCO3 is used as pore formation agent avoiding the use of toxic organic matters...
July 11, 2017: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/28800098/porous-graphene-oxide-prepared-on-nickel-foam-by-electrophoretic-deposition-and-thermal-reduction-as-high-performance-supercapacitor-electrodes
#20
Yunhe Xu, Jun Li, Wenxin Huang
A simple electrophoretic deposition method was developed to prepare graphene oxide (GO) films on the frameworks of nickel foam without any conductive agents and polymer binders. Then, GO was transformed into thermally-reduced graphene oxide (RGO) at an appropriate temperature. The effects of deposition voltage and thermal reduction temperature on the electrochemical properties of RGO were investigated by cyclic voltammetry (CV) and galvanostatic charge/discharge. The appropriate combination of deposition voltage and thermal reduction temperature was established...
August 11, 2017: Materials
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