Graphene oxide-doped photothermal heater in microchannel for thermophoretically shifting micro- and nano-particles

2021 ◽  
Vol 130 (24) ◽  
pp. 244901
Author(s):  
Ting Lu ◽  
Senyu Yang ◽  
Bingqi Zhang ◽  
Xinlei Li ◽  
Tongsheng Chen
Keyword(s):  
Graphene Oxide ◽  
Nano Particles

Experimental study on tubular solar still using Graphene Oxide Nano particles in Phase Change Material (NPCM's) for fresh water production

2020 ◽  
Vol 28 ◽  
pp. 101204 ◽  
Author(s):  
A.E. Kabeel ◽  
Ravishankar Sathyamurthy ◽  
A. Muthu Manokar ◽  
Swellam W. Sharshir ◽  
F.A. Essa ◽  
...  
Keyword(s):  
Experimental Study ◽  
Graphene Oxide ◽  
Phase Change ◽  
Phase Change Material ◽  
Fresh Water ◽  
Nano Particles ◽  
Water Production ◽  
Solar Still ◽  
Change Material

Promoting polysulfide conversion by catalytic separator with LiNiPO4 and rGO hybrids for high performance Li–S batteries

2020 ◽  
Vol 8 (38) ◽  
pp. 20111-20121
Author(s):  
Yinze Zuo ◽  
Yuejin Zhu ◽  
Qi Wang ◽  
Kezhong Lv ◽  
Weiming Su ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reaction Kinetics ◽  
Reduced Graphene Oxide ◽  
High Performance ◽  
Coating Layer ◽  
Nano Particles ◽  
Functional Coating ◽  
Shuttle Effect ◽  
Reduced Graphene ◽  
Novel Strategy

A novel strategy for suppressing the “shuttle effect” of LiPSs and facilitating reaction kinetics is achieved using the reduced graphene oxide (rGO) with incorporated polar LiNiPO4 (LNPO) nano-particles as functional coating layer for separator.

scholarly journals Synthesis, Characterization, Photo-Luminescence and Antibacterial Activities of Silica-Graphene Oxide Composites

2021 ◽  
Author(s):  
Imad H. Khaleel ◽  
Abdulkareem A. Alkhafaji ◽  
Hussein A. Miran ◽  
Zainab N. Jaf
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Dye Adsorption ◽  
Photo Luminescence ◽  
Antibacterial Activities ◽  
Nano Particles ◽  
Glass Substrates ◽  
Nano Powder

In this research, a novel thin film Si-GO10 and nano-powders Si-GO30 of silica-graphene oxide composite were prepared via sol-gel method and deposited on glass substrates using spray pyrolysis. XRD results showed a relatively strong peak in graphite layer that corresponds to the plane of (002). TEM images displayed that SiO<sub>2</sub> nano-particles were randomly distributed on the surface of Si-GO30 sample, and the particle size in these nano-powders was below 50 nm. Moreover, silica nano-particles on the surface of GO plates exhibited almost a spherical and rod-like nanoparticles shapes, which in turn confirmed the formation of SiO<sub>2</sub>-GO nano-hybrids. FESEM analysis reveals a different morphology, the Si-GO10 sample is so rough and crumble, while the Si-GO30 sample is relatively smooth on the surface. Photocatalytic investigations revealed the composite materials exhibit high activity for dye adsorption and decomposition. Si-GO10 thin film did not undergo degradation after 120 minutes, however, for Si-GO30 nano-powder, the adsorption peak intensity was reduced to 665 nm, indicating a decrease in the dye concentration in the solution. FTIR analysis demonstrated that carboxylic functional groups are decreased by increasing silica particles. Photo-Luminescence (PL) spectrum in Si-GO10 thin film disclosed a severe emission peak at about 675 nm. This spectrum was completely disappeared in Si-GO30 nano-powders. Results of the antibacterial properties emphasized that Si-GO30 nano-particle would prevent Escherichia. coli growth after 20 hours. The presented methodology allows for the synthesis of graphene oxide supported silicon dioxide nano-particles for promising applications in photocatalytic and antibacterial fields.

Synthesis and Enhanced Electro-Magnetic Wave Absorbing Properties of Reduced Graphene Oxide-Fe3O4-Polyaniline Ternary Nano-Composites

2021 ◽  
Vol 13 (3) ◽  
pp. 473-480
Author(s):  
Yihan Jin ◽  
Xi Luo ◽  
Jinglin Zhang ◽  
Dongliang Zhao ◽  
Kewei Gao
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Nano Particles ◽  
Magnetic Data ◽  
Nano Composites ◽  
Frequency Bandwidth ◽  
Magnetic Wave ◽  
Three Samples ◽  
Reduced Graphene ◽  
Electro Magnetic

Micro-emulsion method is adopted to synthesis rGO-Fe3O4-PANI (reduced graphene oxide-Fe3O4-polyaniline) ternary nano-composites. With the different contents of aniline (0.1 g, 0.2 g, 0.3 g) added in production, the corresponding final products are named as sample 1, sample 2, sample 3, respectively. The results of TEM indicate that the mean size of Fe3O4 nano-particles is 14 nm and they are anchored onto rGO slice. There are some PANI polymer wrinkles distributed on the rGO surface uniformly. The electro-magnetic data demonstrate that sample 1 possess a great enhancement of the electro-magnetic wave absorption abilities and frequency bandwidth among the three samples. The RLmin (minimum reflection loss) value of sample 1 is -44.16 dB at 4.29 GHz with 5 mm coating thickness and 1.77 GHz (3.72-4.94 GHz, 13.33-13.88 GHz) frequency bandwidth (RL <italic/> -10 dB). We can believe that this kind of nano-composites will have a promising application in the future.

Electro-Magnetic Wave Absorbing Properties Study of Nano-Composites Based on Fe3O4

2021 ◽  
Vol 13 (3) ◽  
pp. 447-454
Author(s):  
Yihan Jin ◽  
Xi Luo ◽  
Jinglin Zhang ◽  
Yipeng Yu ◽  
Jing An ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Nano Particles ◽  
Magnetic Wave ◽  
Transmission Electron ◽  
Reduced Graphene ◽  
Micro Emulsion ◽  
Mean Size ◽  
Electro Magnetic ◽  
Magnetic Nano Particles

Chemical coprecipitation method, hydrothermal method and micro-emulsion method were adopted to prepare pure Fe3O4 (X1) magnetic nano-particles, reduced graphene oxide-Fe3O4 (X2) binary composites and reduced graphene oxide-Fe3O4-polyaniline (X3) ternary composites. The morphology, structure and magnetic performance were characterized by X-ray diffraction (XRD), Raman spectroscopy, transmission electron microscopy (TEM) and vibration sample magnetism (VSM). The result of TEM showed that Fe3O4 nano-particles distributed uniformly on the surface of graphene and PANI matrix and the mean size was bout 13~14 nm. The electromagnetic data was tested by vector network analyzer demonstrating that the minnimum reflection loss (RLmin) value of X3 was -53.94 dB at 16.1 GHz with 1.5 mm thickness and 3.82 GHz (14.18~18 GHz) absorbing bandwidth (RL<italic/>-10 dB). Compared with pure magnetic Fe3O4 powders and rGO-Fe3O4 binary composites, the rGO-Fe3O4-PANI ternary composites were conduced to a great reinforce of the electro-magnetic wave absorbing properties and absorbing bandwidth.

scholarly journals Evaluation of Addition of Carbon Nano Materials Over Properties of an Elastomeric Matrix

2021 ◽  
Vol 57 (4) ◽  
pp. 45-54
Author(s):  
Beatriz Adriana Salazar-Cruz ◽  
Jose Luis Rivera-Armenta ◽  
Cynthia Graciela Flores-Hernandez ◽  
Juventino Lopez-Barroso ◽  
Jorge Estrada-Martinez ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Carbon Nanostructures ◽  
Carbon Nanomaterials ◽  
Viscoelastic Behavior ◽  
Expanded Graphite ◽  
Thermal Characterization ◽  
Mechanical Analysis ◽  
Nano Particles ◽  
Elastomeric Matrix ◽  
Surface Patterns

In the present work, the effect of the addition of different types of carbon nano structures on the mechanical, thermomechanical and thermal properties of a radial structure of styrene-butadiene-styrene (SBSR) copolymer matrix is reported. Different carbon nanostructures were used as nano-rein-forcements: expanded graphite (XG), graphene oxide (GO), reduced graphene oxide (RGO) and exfo-liated graphene (EG). These carbon structures present various functional groups, such as carbonyl, epoxy, and others, which are the responsible for the interaction between the polymer matrix and the nano particles. The compatibility induced between the nanomaterials and the elastomeric matrix fa-vors the stable dispersion of the nanocomposites during their obtention process. For instance, the ad-dition of GO increased in 10 and 16% the tensile strength and storage modulus of the nanocomposites. The fracture surface patterns in the nanocomposites after the tensile test was observed by scanning electron microscopy. Also, the dynamic mechanical analysis (DMA) and thermal characterization showed differences in the viscoelastic behavior of the reinforced nanocomposites with different carbon nanomaterials.

Impact of (nano)formulations on the distribution and wash-off of copper pesticides and fertilisers applied on citrus leaves

2019 ◽  
Vol 16 (6) ◽  
pp. 401 ◽  
Author(s):  
Melanie Kah ◽  
Divina Navarro ◽  
Rai S. Kookana ◽  
Jason K. Kirby ◽  
Swadeshmukul Santra ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Nano Particles ◽  
Systematic Research ◽  
Ionic Form ◽  
Essential Information ◽  
Ethanol Mixture ◽  
Pesticide Formulations ◽  
Citrus Leaves ◽  
Nano Formulation ◽  
Wide Usage

Environmental contextThere are great concerns around current wide usage of copper-based agrochemicals. We compare the fate of nano- and conventional forms of copper, in particular their resistance to wash-off by rain (rainfastness), following their application to citrus leaves. Results showing large differences between the formulations in the amount and forms of copper washed from the leaves provide essential information to optimise agrochemical efficacy while minimising the environmental impact. AbstractThis study compares the rainfastness of nine forms of Cu, including nano and conventional Cu-based fungicide formulations, as well as their salt or bulk equivalents. Rainfastness is the ability to resist wash-off; it is a key property for improving pesticide formulations and for assessing the potential transfer of pesticides to the soil. A new protocol was developed to characterise losses of Cu from treated leaves. It consisted of dipping the leaves in rainwater and then in an acid/ethanol mixture followed by size fractionation. The proportion of Cu lost by wash-off from citrus leaves ranged from &lt;2% (Tribasic, nCuO or Cu(OH)2) up to 93% (CuSO4) of the initial amount of Cu applied. Intermediate Cu losses were observed for formulations with silica (nano)particles (9–14% of applied Cu), Kocide (22%), ChampDP (31%), and a formulation with graphene oxide (47%). Smaller particles generally resulted in less wash-off, possibly due to stronger attachment to the leaf surface, but other factors such as the particle shape and solubility also played an essential role. The retention of nCuO to the leaves was particularly high, and the exact mechanisms involved (e.g. foliar uptake) deserve further work. Most of the Cu was washed off in its ionic form (&gt;74%). Two Cu formulations (one commercial formulation and the formulation with graphene oxide) also showed wash off in significant proportions of Cu (~17%) in the nano-sized fraction. This study provides essential information on the amounts and forms of Cu that may reach the soil after the application of Cu-based agrochemicals. The great diversity in behaviour across the range of formulations considered highlights the need for more systematic research to fully exploit the potential improvements of current agrochemicals through (nano)formulation technologies.

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