keyword
MENU ▼
Read by QxMD icon Read
search

graphene oxide

keyword
https://www.readbyqxmd.com/read/28918582/removal-of-endrin-and-dieldrin-isomeric-pesticides-through-stereoselective-adsorption-behavior-on-the-graphene-oxide-magnetic-nanoparticles
#1
Kamlesh Shrivas, Archana Ghosale, Nidhi Nirmalkar, Arti Srivastava, Sunil Kumar Singh, Sandip S Shinde
A novel stereoselective removal behavior of isomeric endrin and dieldrin pesticides from sample solution is demonstrated using nanocomposite of graphene oxide (GO) and iron oxide (Fe3O4) magnetic nanoparticles (MNPs). The removal efficiency of endrin and dieldrin was found higher when GO-MNPs was used as a separating probe than the individual use of GO and MNPs. The removal efficiency of both the pesticides was found to be more favorable when the dosage amount of GO-MNPs was 30 mg for 30-min contact time with pH 4...
September 16, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28917904/metal-organic-framework-preparation-using-magnetic-graphene-oxide-%C3%AE-cyclodextrin-for-neonicotinoid-pesticide-adsorption-and-removal
#2
Guangyang Liu, Lingyun Li, Donghui Xu, Xiaodong Huang, Xiaomin Xu, Shuning Zheng, Yanguo Zhang, Huan Lin
A novel magnetic copper-based metal-organic framework (M-MOF) was prepared using a Fe4O3-graphene oxide (GO)-β-cyclodextrin (β-CD) nanocomposite as the magnetic core and support, and used for adsorption and removal of neonicotinoid insecticide pollutants from aqueous solution. M-MOF characterization suggested that (1)Fe4O3-GO-β-CD consisted of a thin single layer with anchored Fe3O4. The M-MOF was coated on the Fe4O3-GO-β-CD surface. The M-MOF had a large Brunauer-Emmett-Teller surface area (250.33m(2)g(-1)) and high super-paramagnetism with saturation magnetization of 10...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917895/ultrasound-assisted-adsorptive-removal-of-hazardous-dye-safranin-o-from-aqueous-solution-using-crosslinked-graphene-oxide-chitosan-goch-composite-and-optimization-by-response-surface-methodology-rsm-approach
#3
Sushanta Debnath, Kamya Parashar, Kriveshini Pillay
Chitosan (CH) was crosslinked with graphene oxide (GO) by combining solutions of CH and GO. Characterisations by ATR-FTIR, FE-SEM and XRD confirmed the formation of the GOCH composite. Removal of the dye Safranin Orange (SO) by ultrasonic adsorption from aqueous solution was tested by the composite. The removal of the cationic dye was more favourable at pH values greater than 5.2 and the optimum pH was found to be 6.5. The adsorption kinetics followed a pseudo-first order model and the rate-limiting step was identified as boundary layer diffusion from the Intraparticle diffusion model...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917859/superhydrophilic-graphene-oxide-electrospun-cellulose-nanofiber-hybrid-membrane-for-high-efficiency-oil-water-separation
#4
Chenghong Ao, Wei Yuan, Jiangqi Zhao, Xu He, Xiaofang Zhang, Qingye Li, Tian Xia, Wei Zhang, Canhui Lu
Inspired from fishscales, membranes with special surface wettability have been applied widely for the treatment of oily waste water. Herein, a novel superhydrophilic graphene oxide (GO)@electrospun cellulose nanofiber (CNF) membrane was successfully fabricated. This membrane exhibited a high separation efficiency, excellent antifouling properties, as well as a high flux for the gravity-driven oil/water separation. Moreover, the GO@CNF membrane was capable to effectively separate oil/water mixtures in a broad pH range or with a high concentration of salt, suggesting that this membrane was quite promising for future real-world practice in oil spill cleanup and oily wastewater treatment...
November 1, 2017: Carbohydrate Polymers
https://www.readbyqxmd.com/read/28917803/atp-mediated-rolling-circle-amplification-and-opening-dna-gate-for-drug-delivery-to-cell
#5
Yujie Wang, Xinxin Shang, Jia Liu, Yingshu Guo
Here, we have developed a facile fluorometric system for the detection of adenosine triphosphate (ATP) by a rolling circle amplification (RCA) based on proximity ligation mediated amplification, and simultaneously achieved the release of the anticancer drug doxorubicin (DOX) through the mesoporous silicon system. Once the ATP molecule is present, the linker DNA will be released from the graphene oxide (GO) surface and hybridized to the template DNA of the GO surface joining with ligation enzyme. RCA reaction is followed by the addition of the phi29 DNA polymerase...
January 1, 2018: Talanta
https://www.readbyqxmd.com/read/28916996/successive-release-of-tissue-inhibitors-of-metalloproteinase-1-through-graphene-oxide-based-delivery-system-can-promote-skin-regeneration
#6
Cheng Zhong, Dike Shi, Yixiong Zheng, Peter J Nelson, Qi Bao
The purpose of this study was to testify the hypothesis that graphene oxide (GO) could act as an appropriate vehicle for the release of tissue inhibitors of metalloproteinase-1 (TIMP-1) protein in the context of skin repair. GO characteristics were observed by scanning electron microscopy, atomic force microscopy, and thermal gravimetric analysis. After TIMP-1 absorbing GO, the release profiles of various concentrations of TIMP-1 from GO were compared. GO biocompatibility with fibroblast viability was assessed by measuring cell cycle and apoptosis...
September 15, 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28916741/enhancement-of-water-diffusion-and-compression-performance-of-crosslinked-alginate-films-with-a-minuscule-amount-of-graphene-oxide
#7
Ángel Serrano-Aroca, Juan-Francisco Ruiz-Pividal, Mar Llorens-Gámez
A series of calcium alginate composite hydrogels with several calcium chloride contents ranging from 3 to 18 wt.% with and without 0.1 wt.% of graphene oxide (GO) was prepared in order to study the effect of crosslinking and nanofilling on water diffusion and compression performance. Thus, for high crosslinker contents, these composite hydrogels exhibited ultrafast diffusion of liquid water and excellent compression properties as compared with control (0 wt.% GO and the same crosslinking). These remarkable results are produced due to calcium cations are able to crosslink alginate and also graphene oxide nanosheets to form large crosslinked GO networks inside the calcium alginate hydrogels...
September 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28915946/a-hydrogen-peroxide-sensor-based-on-tnm-functionalized-reduced-graphene-oxide-grafted-with-highly-monodisperse-pd-nanoparticles
#8
Sait Bozkurt, Berna Tosun, Betül Sen, Süleyman Akocak, Aysun Savk, Mehmet Faruk Ebeoğlugil, Fatih Sen
Addressed herein, we report the synthesis and characterization of a tert-nonyl mercaptan (TNM) functionalized reduced graphene oxide (rGO) supported palladium (Pd) nanoparticles (NPs) (Pd/TNM@rGO) as electrochemical sensor. The highly monodisperse Pd/TNM@rGO nanocomposite was applied for electrochemical determination of hydrogen peroxide (H2O2) at a potential range of -0.6 to +0.8 V. The Pd/TNM@rGO sensor demonstrated very high activity, sensitivity, reusability and durability toward H2O2 sensing. The well dispersed Pd/TNM@rGO nanocomposite has been characterized by using several analytical techniques such as, X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), electron energy loss spectroscopy (EELS) and electrochemical impedance spectroscopy (EIS)...
October 9, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28915759/an-ab-initio-study-of-hydroxylated-graphane
#9
Francesco Buonocore, Andrea Capasso, Nicola Lisi
Graphene-based derivatives with covalent functionalization and well-defined stoichiometry are highly desirable in view of their application as functional surfaces. Here, we have evaluated by ab initio calculations the energy of formation and the phase diagram of hydroxylated graphane structures, i.e., fully functionalized graphene derivatives coordinated with -H and -OH groups. We compared these structures to different hydrogenated and non-hydrogenated graphene oxide derivatives, with high level of epoxide and hydroxyl groups functionalization...
September 14, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28914768/tilted-fiber-bragg-grating-sensor-with-graphene-oxide-coating-for-humidity-sensing
#10
Yung-Da Chiu, Chao-Wei Wu, Chia-Chin Chiang
In this study, we propose a tilted fiber Bragg grating (TFBG) humidity sensor fabricated using the phase mask method to produce a TFBG that was then etched with five different diameters of 20, 35, 50, 55 and 60 μm, after which piezoelectric inkjet technology was used to coat the grating with graphene oxide. According to the experimental results, the diameter of 20 μm yielded the best sensitivity. In addition, the experimental results showed that the wavelength sensitivity was -0.01 nm/%RH and the linearity was 0...
September 15, 2017: Sensors
https://www.readbyqxmd.com/read/28914490/a-catalytic-microwave-process-for-superfast-preparation-of-high-quality-reduced-graphene-oxide
#11
Runze Liu, Yu Zhang, Zhenjian Ning, Yuxi Xu
Herein we report that a small amount of graphite can unexpectedly act as the catalyst to greatly promote the microwave exfoliation and reduction of graphite oxide in ambient air. The reaction can be finished in a few seconds in contrast to more than ten minutes without catalyst. Meanwhile, the catalytic microwave exfoliated graphite oxide (CMEGO) shows much better quality than the traditional microwave exfoliated graphite oxide, including a much higher exfoliation degree with thinner graphene sheets and higher specific surface area (886 m2/g vs 466 m2/g), a much larger C/O ratio (19...
September 15, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28913426/artificial-solid-electrolyte-interphase-for-aqueous-lithium-energy-storage-systems
#12
Jian Zhi, Alireza Zehtab Yazdi, Gayathri Valappil, Jessica Haime, Pu Chen
Aqueous lithium energy storage systems address environmental sustainability and safety issues. However, significant capacity fading after repeated cycles of charge-discharge and during float charge limit their practical application compared to their nonaqueous counterparts. We introduce an artificial solid electrolyte interphase (SEI) to the aqueous systems and report the use of graphene films as an artificial SEI (G-SEI) that substantially enhance the overall performance of an aqueous lithium battery and a supercapacitor...
September 2017: Science Advances
https://www.readbyqxmd.com/read/28910678/colorimetric-aptasensor-for-the-detection-of-salmonella-enterica-serovar-typhimurium-using-znfe2o4-reduced-graphene-oxide-nanostructures-as-an-effective-peroxidase-mimetics
#13
Shijia Wu, Nuo Duan, Yueting Qiu, Jinghong Li, Zhouping Wang
A new colorimetric aptasensor platform was fabricated to detect Salmonella enterica serovar typhimurium based on the peroxidase-like activity of ZnFe2O4-reduced graphene oxide (ZnFe2O4/rGO) nanostructures. The synthesized ZnFe2O4/rGO can catalytically oxidize 3,3',5,5'-tetramethylbenzidine (TMB) by H2O2 and generate a typical blue product, which was detected by micro-reader at 652nm. Therefore, ZnFe2O4/rGO was conjugated with aptamer to act as the signal probe. Biotin modified aptamer was immobilized onto the micro-plate to act as the capture probe...
September 6, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28906445/shape-memory-polyurethane-materials-containing-ferromagnetic-iron-oxide-and-graphene-nanoplatelets
#14
Magdalena Urban, Michał Strankowski
Intelligent materials, such as memory shape polymers, have attracted considerable attention due to wide range of possible applications. Currently, intensive research is underway, in matters of obtaining memory shape materials that can be actuated via inductive methods, for example with help of magnetic field. In this work, an attempt was made to develop a new polymer composite-polyurethane modified with graphene nanoplates and ferromagnetic iron oxides-with improved mechanical properties and introduced magnetic and memory shape properties...
September 14, 2017: Materials
https://www.readbyqxmd.com/read/28905618/functionalization-of-reduced-graphene-oxide-via-thiol-maleimide-click-chemistry-facile-fabrication-of-targeted-drug-delivery-vehicles
#15
Yavuz Oz, Alexandre Barras, Rana Sanyal, Rabah Boukherroub, Sabine Szunerits, Amitav Sanyal
Reduced graphene oxide (rGO) based materials have shown to be amenable to non-covalent functionalization through hydrophobic interactions. The scaffold however does not provide sufficient covalent linkage given the low number of reactive carboxyl and alcohol groups typically available on rGO. The integration of clickable groups, particularly ones which can undergo efficient conjugation without any metal catalyst, would allow facile functionalization of these materials. This study reports on the non-covalent association of a maleimide-containing catechol (dopa-MAL) surface anchor onto rGO...
September 14, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28904623/ni-nanoparticles-on-rgo-as-reusable-heterogeneous-catalyst-effect-of-ni-particle-size-and-intermediate-composite-structures-in-c-s-cross-coupling-reaction
#16
Debasish Sengupta, Koushik Bhowmik, Goutam De, Basudeb Basu
The present work demonstrates the C-S cross-coupling reaction between aryl halides and thiols using nickel nanoparticles (Ni NPs) supported on reduced graphene oxide (Ni/RGO) as a heterogeneous catalyst. It is observed that the uniformly dispersed Ni NPs supported on RGO could exhibit excellent catalytic activity in C-S cross-coupling reactions and the catalytic application is generalized with diverse coupling partners. Although the electron-rich planar RGO surface helps in stabilizing the agglomeration-free Ni NPs, the catalytic process is found to occur involving Ni(II) species and the recovered catalyst containing both Ni(0)/Ni(II) species is equally efficient in recycle runs...
2017: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28902155/one-step-facile-synthesis-of-aptamer-modified-graphene-oxide-for-highly-specific-enrichment-of-human-a-thrombin-in-plasma
#17
Yuan Xu, Siyuan Tan, Qionglin Liang, Mingyu Ding
The enrichment of low-abundance proteins in complex biological samples plays an important role in clinical diagnostics and biomedical research. This work reports a novel one-step method for the synthesis of aptamer-modified graphene oxide (GO/Apt) nanocomposites, without introducing the use of gold, for the rapid and specific separation and enrichment of human α-thrombin from buffer solutions with highly concentrated interferences. The obtained GO/Apt nanocomposites had remarkable aptamer immobilization, up to 44...
September 13, 2017: Sensors
https://www.readbyqxmd.com/read/28901747/the-deep-eutectic-solvent-functionalized-graphene-composite-as-an-extremely-high-potent-flame-retardant
#18
Dattatray Appasha Pethsangave, Rahul Vijay Khose, Pravin Harishchandra Wadekar, Surajit Some
We report a simple and green approach to develop the deep eutectic solvent functionalized graphene derivative, as an effective flame retardant. The deep eutectic solvent functionalized graphene oxide (DESGO) was synthesized by intro-ducing nitrogen supported phosphorus functional groups on the surface of graphene derivative via a deep eutectic sol-vent, which is prepared by the treatment of monosodium dihydrogen orthophosphate and choline chloride. Subse-quently, the resultant DESGO material is characterized by X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, thermo gravimetric analysis (TGA) and scanning electron microscopy (SEM)...
September 13, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28901740/inhibiting-metastasis-and-preventing-tumor-relapse-by-triggering-host-immunity-with-tumor-targeted-photodynamic-therapy-using-photosensitizer-loaded-functional-nanographenes
#19
Xinhe Yu, Duo Gao, Liquan Gao, Jianhao Lai, Chenran Zhang, Yang Zhao, Lijun Zhong, Bing Jia, Fan Wang, Xiaoyuan Chen, Zhaofei Liu
Effective cancer therapy depends not only on destroying the primary tumor, but also on conditioning the host immune system to recognize and eliminate residual tumor cells and prevent metastasis. In this study, a tumor integrin αvβ6-targeting peptide (the HK peptide)-functionalized graphene oxide (GO) was coated with a photosensitizer (HPPH). The resulting GO conjugate, GO(HPPH)-PEG-HK, was investigated whether it could destroy primary tumors and boost host antitumor immunity. We found that GO(HPPH)-PEG-HK exhibited significantly higher tumor uptake than GO(HPPH)-PEG and HPPH...
September 13, 2017: ACS Nano
https://www.readbyqxmd.com/read/28901581/hybrid-copper-nanowire-reduced-graphene-oxide-coatings-a-green-solution-toward-highly-transparent-highly-conductive-and-flexible-electrodes-for-opto-electronics
#20
Alessandro Aliprandi, Tiago Moreira, Cosimo Anichini, Marc-Antoine Stoeckel, Matilde Eredia, Ugo Sassi, Matteo Bruna, Carlos Pinheiro, César A T Laia, Sara Bonacchi, Paolo Samorì
This study reports a novel green chemistry approach to assemble copper-nanowires/reduced-graphene-oxide hybrid coatings onto inorganic and organic supports. Such films are robust and combine sheet resistances (<30 Ω sq(-1) ) and transparencies in the visible region (transmittance > 70%) that are rivalling those of indium-tin oxide. These electrodes are suitable for flexible electronic applications as they show a sheet resistance change of <4% after 10 000 bending cycles at a bending radius of 1.0 cm, when supported on polyethylene terephthalate foils...
September 13, 2017: Advanced Materials
keyword
keyword
40177
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"