Strength and feasibility aspects of concrete mixes induced with low-cost surfactant functionalized graphene powder

2022 ◽  
Author(s):  
Sejal P. Dalal ◽  
Kandarp Desai ◽  
Dhairya Shah ◽  
Sanjay Prajapati ◽  
Purvang Dalal ◽  
...  
Keyword(s):  
Low Cost ◽  
Functionalized Graphene

scholarly journals Hydrogenated Graphene Based Organic Thin Film Transistor Sensor for Detection of Chloride Ions as Corrosion Precursors

2022 ◽  
Vol 12 (2) ◽  
pp. 863
Author(s):  
Mounia Chakik ◽  
Siziwe Bebe ◽  
Ravi Prakash
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Environmental Factors ◽  
Low Cost ◽  
Chloride Ions ◽  
Functionalized Graphene ◽  
Organic Thin Film ◽  
Surface Wetness ◽  
Hydrogenated Graphene ◽  
Monitoring Protocols

Corrosion monitoring and management has been at the center of structural health monitoring protocols due to its damaging effects on metallic structures. Current corrosion prevention and management programs often fail to include environmental factors such as Cl− ions and surface wetness. Early detection of these environmental factors can prevent the onset of corrosion and reduce repair and maintenance-related expenses. There is growing interest in creating solution-processed thin film environmental sensors with high sensitivity to corrosion precursors, low-cost fabrication, and small footprint, rendering them viable candidates for investigation as potential corrosion sensors that could be easily integrated into existing structures and screen printed or patterned directly into surface coatings. In this work, we have implemented C60-based n-type organic thin film transistors (OTFTs) with functionalized graphene oxide for humidity sensing and functionalized graphene nanoparticles for Cl− ion detection, using low-cost solution processing techniques. The reduced graphene oxide (rGO)-coated OTFT humidity sensor is designed for the qualitative estimation of surface moisture levels and high levels of humidity, and it exhibits a relative responsivity for dry to surface wetness transition of 122.6% to surface wetness, within a response time of 20 ms. We furthermore implemented an in-house synthesized hydrogenated graphene coating in conjunction with a second OTFT architecture for Cl− ions sensing which yielded a sensitivity of 4%/ppm to ultrafine ionic concentrations, over an order of magnitude lower than the range identified to cause corrosion in aircraft structures.

scholarly journals Improved Mechanical and Electrochemical Properties of XNBR Dielectric Elastomer Actuator by Poly(dopamine) Functionalized Graphene Nano-Sheets

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 218 ◽  
Author(s):  
Dan Yang ◽  
Xinxin Kong ◽  
Yufeng Ni ◽  
Mengnan Ruan ◽  
Shuo Huang ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
High Performance ◽  
Low Cost ◽  
Dielectric Strength ◽  
Dielectric Elastomer ◽  
Hydroxyl Groups ◽  
Butadiene Rubber ◽  
Functionalized Graphene ◽  
Filler Dispersion ◽  
Phenolic Hydroxyl Groups

In this work, graphene nano-sheets (GNS) functionalized with poly(dopamine) (PDA) (denoted as GNS-PDA) were dispersed in a carboxylated nitrile butadiene rubber (XNBR) matrix to obtain excellent dielectric composites via latex mixing. Because hydrogen bonds were formed between –COOH groups of XNBR and phenolic hydroxyl groups of PDA, the encapsulation of GNS-PDA around XNBR latex particles was achieved, and led to a segregated network structure of filler formed in the GNS-PDA/XNBR composite. Thus, the XNBR composite filled with GNS-PDA showed improved filler dispersion, enhanced dielectric constant and dielectric strength, and decreased conductivity compared with the XNBR composite filled with pristine GNS. Finally, the GNS-PDA/XNBR composite displayed an actuated strain of 2.4% at 18 kV/mm, and this actuated strain was much larger than that of pure XNBR (1.3%) at the same electric field. This simple, environmentally friendly, low-cost, and effective method provides a promising route for obtaining a high-performance dielectric elastomer with improved mechanical and electrochemical properties.

scholarly journals Hydrophilic PAN based carbon nanofibres with improved graphitic structure and enhanced mechanical performance using ethylenediamine functionalized graphene

RSC Advances ◽  
2017 ◽  
Vol 7 (5) ◽  
pp. 2621-2628 ◽  
Author(s):  
Zhenyu Li ◽  
Omid Zabihi ◽  
Jinfeng Wang ◽  
Quanxiang Li ◽  
Jiemin Wang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Performance ◽  
Carbon Materials ◽  
Mechanical Performance ◽  
Low Cost ◽  
Functionalized Graphene ◽  
Carbon Nanofibres ◽  
Great Opportunity ◽  
Graphitic Structure

Polyacrylonitrile (PAN) reinforced with nano-carbons such as graphene (Gr) and carbon nanotubes (CNTs) provides great opportunity for the development of low-cost and high-performance carbon materials.

scholarly journals Sequence-Independent DNA Adsorption on Few-Layered Oxygen-Functionalized Graphene Electrodes: An Electrochemical Study for Biosensing Application

Biosensors ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 273
Author(s):  
Narges Asefifeyzabadi ◽  
Torrey E. Holland ◽  
Poopalasingam Sivakumar ◽  
Saikat Talapatra ◽  
Ishani M. Senanayake ◽  
...  
Keyword(s):  
Divalent Cations ◽  
Low Cost ◽  
Differential Pulse ◽  
Current Response ◽  
Functionalized Graphene ◽  
Label Free ◽  
Dna Adsorption ◽  
Redox Probe ◽  
Highly Sensitive ◽  
Electrochemical Charge Transfer

DNA is strongly adsorbed on oxidized graphene surfaces in the presence of divalent cations. Here, we studied the effect of DNA adsorption on electrochemical charge transfer at few-layered, oxygen-functionalized graphene (GOx) electrodes. DNA adsorption on the inkjet-printed GOx electrodes caused amplified current response from ferro/ferricyanide redox probe at concentration range 1 aM–10 nM in differential pulse voltammetry. We studied a number of variables that may affect the current response of the interface: sequence type, conformation, concentration, length, and ionic strength. Later, we showed a proof-of-concept DNA biosensing application, which is free from chemical immobilization of the probe and sensitive at attomolar concentration regime. We propose that GOx electrodes promise a low-cost solution to fabricate a highly sensitive platform for label-free and chemisorption-free DNA biosensing.

Oxocarbon-functionalized graphene as a lithium-ion battery cathode: a first-principles investigation

2018 ◽  
Vol 20 (11) ◽  
pp. 7447-7456 ◽  
Author(s):  
Zicheng Wang ◽  
Shuzhou Li ◽  
Yaping Zhang ◽  
Huaizhe Xu
Keyword(s):  
Lithium Ion Battery ◽  
First Principles ◽  
Electrode Materials ◽  
Low Cost ◽  
Lithium Ion ◽  
Environmentally Friendly ◽  
Functionalized Graphene ◽  
Li Ion Battery ◽  
Battery Electrode ◽  
Li Ion

In recent years, organic-based, especially carbonyl-based, Li-ion battery electrode materials have attracted great attention due to their low-cost, environmentally friendly nature and strong Li-ion bonding abilities.

Detection of Escherichia coli O157:H7 with Antibody Conjugated Amino-Functionalized Graphene Quantum Dots as Immunofluorescence Probes

2019 ◽  
Vol 807 ◽  
pp. 151-158
Author(s):  
Xiao Zhan Yang ◽  
Wen Lin Feng ◽  
Gao Chen ◽  
Hong Feng Guo ◽  
Dao Yuan Wang
Keyword(s):  
Escherichia Coli ◽  
Quantum Dots ◽  
Pathogen Detection ◽  
Low Cost ◽  
Graphene Quantum Dots ◽  
Spectroscopic Properties ◽  
Spectroscopic Techniques ◽  
Functionalized Graphene ◽  
Raman Spectroscopic ◽  
E Coli

Escherichia coli O157: H7 (E. coli O157: H7) is a foodborne pathogenic bacterium which can cause fever, diarrhoea and vomiting in humans. Thus, a rapid, simple, and specific bioprobe for pathogen detection in contaminated foods has been attracted more and more attention. In this work, the strong fluorescent amino-functionalized graphene quantum dots (af-GQDs) were prepared by hydrothermal method. The microtopographic height, surface morphology and spectroscopic properties of af-GQDs are characterized by the high resolution transmission electron microscope (HRTEM), atomic force microscope (AFM), UV-vis, fluorescence, Raman spectroscopic techniques. All the results showed that the af-GQDs can be effectively applied in the preparation of biocompatible immunofluorescence probe and in the detection of E. coli O157: H7. The minimum detection limit is 100 cfu/mL. It is a simple, rapid, sensitive, low-cost and easy to be popularized method, which provides a feasible way to monitor E. coli O157: H7 in food safety.

scholarly journals Enhanced performance of ZnO nanorod array/CuSCN ultraviolet photodetectors with functionalized graphene layers

RSC Advances ◽  
2021 ◽  
Vol 11 (13) ◽  
pp. 7682-7692
Author(s):  
Guangcan Luo ◽  
Ziling Zhang ◽  
Jing Jiang ◽  
Yang Liu ◽  
Wei Li ◽  
...  
Keyword(s):  
Low Cost ◽  
Nanorod Array ◽  
Hole Transport ◽  
Device Performance ◽  
Zno Nanorod ◽  
Functionalized Graphene ◽  
Graphene Layers ◽  
Zno Nanorod Array ◽  
Self Powered ◽  
Ultraviolet Photodetectors

Facile, convenient and low-cost processes were used to fabricate self-powered ZnO nanorod array ultraviolet photodetectors with CuSCN/rGO hole-transport bilayers. The device performance with a functionalized graphene layer was greatly improved.

scholarly journals Effect of Functionalized Graphene on the Mechanical Properties of Okra Cellulose Nanofibers/Epoxy Nanocomposites

2020 ◽  
Vol 9 (4) ◽  
pp. 1963-1969
Keyword(s):  
Mechanical Properties ◽  
Biomedical Applications ◽  
Low Cost ◽  
Cellulose Nanofibers ◽  
Reinforced Composites ◽  
Functionalized Graphene ◽  
Epoxy Nanocomposites ◽  
Green Route ◽  
Alternative Materials

Towards the use of renewable, biodegradability, low cost, and ecofriendly materials, the recent trend has inclined to the cellulose nanofibers based material in different applications.. The purpose of the present research is to develop a new nanocomposite material. In the present study, the authors have investigated the effect of dispersion of Functionalized Graphene (GP) of epoxy nanocomposites laminates fabricated from Okra Cellulose Nanofibers (CNFs). Nanocomposite materials have been identified as alternative materials for automotive, aerospace, structural, and biomedical applications. The weight of functionalized GP in CNFs was varied from 0.25 wt% to 1 wt%. Mechanical properties measured are for tensile, flexural, impact, and microhardness was used for characterization of functional group and structural analysis in functionalized GP. The distribution and confirmation of functionalized GP in CNFs were analyzed using a Scanning Electron Microscope (SEM). The nanocomposites were characterized using tensile, flexural, impact, and microhardness tests based on ASTM standards. Mechanical characterization using nanoindentation techniques also showed significant improvement in mechanical properties of nanocomposites in comparison to CNFs. The 0.75 wt% nanocomposites showed an increase in elastic modulus and hardness, respectively, in comparison to CNFs. The surface morphology of fractured specimens were examined using SEM which revealed good interaction between the GP/CNFs and the epoxy matrix. Overall, this study suggests a prosperous and green route for the fabrication of functionalized GP in CNFs reinforced composites with improved properties such as stiffness, strength, and hardness.

Facile synthesis of cysteine–functionalized graphene quantum dots for a fluorescence probe for mercury ions

RSC Advances ◽  
2015 ◽  
Vol 5 (118) ◽  
pp. 97598-97603 ◽  
Author(s):  
Tran Van Tam ◽  
Soon Ho Hong ◽  
Won Mook Choi
Keyword(s):  
Quantum Dots ◽  
Fluorescence Probe ◽  
Low Cost ◽  
Graphene Quantum Dots ◽  
Fluorescence Probes ◽  
Functionalized Graphene ◽  
Mercury Ions ◽  
Facile Synthesis ◽  
Highly Sensitive ◽  
Environmentally Friendly Method

We synthesized cystenine–functionalized graphene quantum dots (cys–GQDs) by a simple, low cost and environmentally friendly method and demonstrated them as highly sensitive and selective fluorescence probes for Hg2+ detection.

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