scholarly journals Graphene-Ionic Liquid Thin Film Nanolubricant

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 535 ◽  
Author(s):  
María-Dolores Avilés ◽  
Ramón Pamies ◽  
José Sanes ◽  
María-Dolores Bermúdez
Keyword(s):  
Ionic Liquid ◽  
Film Thickness ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Surface Damage ◽  
Thin Layers ◽  
Energy Dispersive Analysis ◽  
Lubricant Film Thickness ◽  
X Ray ◽  
Transmission Electron

Graphene (0.5 wt.%) was dispersed in the hydrophobic room-temperature ionic liquid 1-octyl-3-methylimidazolium bis(trifluoromethanesulfonyl) imide (IL) to obtain a new non-Newtonian (IL + G) nanolubricant. Thin layers of IL and (IL + G) lubricants were deposited on stainless steel disks by spin coating. The tribological performance of the new thin layers was compared with those of full fluid lubricants. Friction coefficients for neat IL were independent of lubricant film thickness. In contrast, for (IL + G) the reduction of film thickness not only afforded 40% reduction of the friction coefficient, but also prevented wear and surface damage. Results of surface profilometry, scanning and transmission electron microscopy (SEM and TEM), energy dispersive analysis (EDX), X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy were discussed.

Photon-Induced Adhesion and Chemical Changes in Aluminium Films on Silicon.

1986 ◽  
Vol 75 ◽  
Author(s):  
Andrew J. Kellock ◽  
J. Liesegang ◽  
G. L. Nyberg ◽  
J. S. Williams
Keyword(s):  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Interface Reaction ◽  
Thin Layers ◽  
Chemical Changes ◽  
X Ray ◽  
Photon Irradiation ◽  
Film Adhesion ◽  
Transmission Electron ◽  
Before And After

AbstractIn the present study, thin layers of Al (<500 Å), deposited on Si under varying vacuum and substrate-cleaning conditions, have been irradiated with various wavelength photons. The films and interfacial oxide layers have been analysed with Rutherford backscattering and channeling (RBS-C), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM) techniques both before and after irradiation. Results indicate that substantial oxygen uptake, indiffusion and interface reaction can take place in some thin Al films during photon irradiation at room temperature. Such photon-induced chemical changes correlate with an increase in film adhesion.

Magnetic Nanoparticle Supported Ionic Liquid Phase Catalyst for Oxidation of Alcohols

2020 ◽  
Vol 73 (11) ◽  
pp. 1088
Author(s):  
Altafhusen Naikwade ◽  
Megha Jagadale ◽  
Dolly Kale ◽  
Gajanan Rashinkar
Keyword(s):  
Ionic Liquid ◽  
Liquid Phase ◽  
Photoelectron Spectroscopy ◽  
Magnetic Nanoparticle ◽  
Analytical Techniques ◽  
X Ray ◽  
Supported Ionic Liquid ◽  
Transmission Electron ◽  
Oxidation Of Alcohols ◽  
Ft Ir

A new magnetic nanoparticle supported ionic liquid phase (SILP) catalyst containing perruthenate anions was prepared by a multistep procedure. The various analytical techniques such as FT-IR spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, thermogravimetric analysis, energy dispersive X-ray analysis, and vibrating sample magnetometer analysis ascertained the successful formation of catalyst. The performance of a magnetically retrievable SILP catalyst was evaluated in the selective oxidation of alcohols. The split test and leaching studies of the SILP catalyst confirmed its heterogeneous nature. In addition, the reusability potential of SILP catalyst was also investigated which revealed its robust activity up to six consecutive cycles.

Synthesis of Graphene Oxide Grafted with Epoxidized Natural Rubber via Aminosilane Linkage

2018 ◽  
Vol 940 ◽  
pp. 28-34
Author(s):  
Pollawat Charoeythornkhajhornchai ◽  
Anongnat Somwangthanaroj
Keyword(s):  
Graphene Oxide ◽  
Natural Rubber ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Interfacial Interaction ◽  
Epoxidized Natural Rubber ◽  
Rubber Matrix ◽  
Mixing Process ◽  
X Ray ◽  
Transmission Electron

Graphene oxide was synthesized from graphite by Hummer method and connected with (3-aminopropyl) triethoxysilane to form graphene oxide-aminosilane (GO-Si) linkage. The solution was centrifuged and washed with acetone to remove unreacted aminosilane before grafting with epoxidized natural rubber (ENR). ENR dissolved in toluene solution was mixed with GO-Si particle and dried at room temperature. Then, it was grafted to form graphene oxide grated with ENR via aminosilane linkage (GO-Si-ENR) by heat treatment. GO-Si-ENR was washed in toluene to remove unconnected ENR molecule. The synthesized GO particle in each step was characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The possible reaction mechanism was proposed in this research. The aim of this synthesis is to improve natural rubber - graphene interfacial interaction thus the dispersion of GO and GO-Si-ENR particle in natural rubber matrix by solvent mixing process was observed by transmission electron microscopy (TEM).

Structural Properties of PbS Nanoparticles Prepared by Photo Chemical Synthesis

2013 ◽  
Vol 678 ◽  
pp. 136-139
Author(s):  
S. Kanimozhi ◽  
Dhandapani Vishnushankar ◽  
V. Veeravazhuthi
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Energy Dispersive Analysis ◽  
X Ray Diffraction ◽  
Pbs Nanoparticles ◽  
X Ray ◽  
Transmission Electron ◽  
Standard Values ◽  
Crystalline Nature ◽  
Xrd Studies

Lead sulfide (PbS) nanoparticles have been synthesized by photo chemical method and also in the dark ambient at room temperature. The pH of the solution is maintained by adding NaOH. The as-prepared PbS nanoparticles have been characterized by X-Ray Diffraction (XRD), Scanning electron microscopy (SEM), Energy-dispersive Analysis of X-ray (EDAX) and Transmission Electron Microscopy (TEM). XRD studies reveal the crystalline nature of the particles. Grain size values are calculated using Scherrer’s formula and compared with the standard values. SEM picture shows a flower like structure in the sample synthesized at dark ambient, whereas the samples synthesized in light reveals the presence of varied nanostructures like nanorods, nanowires and nanoparticles. Size of the photo chemically synthesized PbS particles observed from TEM lies between 30nm to 60nm. From EDAX we conclude that the composition is nearly stoichiometric.

PREPARATION OF Au-LOADED TiO2 BY PHOTOCHEMICAL DEPOSITION AND OZONE PHOTOCATALYTIC DECOMPOSITION

2006 ◽  
Vol 13 (01) ◽  
pp. 51-55 ◽  
Author(s):  
PANKE HE ◽  
MIN ZHANG ◽  
DONGMEI YANG ◽  
JIANJUN YANG
Keyword(s):  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Au Nanoparticles ◽  
Diffuse Reflectance Spectroscopy ◽  
Removal Rate ◽  
Photocatalytic Decomposition ◽  
X Ray ◽  
Transmission Electron ◽  
Photocatalytic Removal ◽  
Photochemical Deposition

In this paper, Au -loaded TiO 2( Au/TiO 2) photocatalysts were prepared by photochemical deposition method and characterized by transmission electron microscopy, diffuse reflectance spectroscopy and X-ray photoelectron spectroscopy. The results indicated the metallic Au nanoparticles were deposited on the surface of TiO 2 after the high-pressure mercury irradiation and regarded as an electronegative center. The photocatalytic decomposition of gaseous ozone was investigated on TiO 2 and Au -loaded TiO 2 at room temperature. Results indicated that the photocatalytic conversion of ozone can be improved by Au/TiO 2 and photocatalytic activity increased with the increase of the photodeposition time. The photocatalytic removal rate of ozone remained above 96% on the surface of 1% Au/TiO 2 with photodeposition for 120 min under black lamp irradiation for 20 h. Au cluster deposited on the surface of TiO 2 functioned not only as the electron trap center but also as the adsorption site of O 3 in photocatalytic reaction.

Large Scale Synthesis of Shuttle like CuO Nanocrystals by Microwave Irradiation

2010 ◽  
Vol 92 ◽  
pp. 117-123 ◽  
Author(s):  
Pei Jun Cai ◽  
Mei Shi
Keyword(s):  
Microwave Irradiation ◽  
Photoelectron Spectroscopy ◽  
Large Scale ◽  
Room Temperature ◽  
Monoclinic Phase ◽  
Aqueous System ◽  
X Ray ◽  
Selected Area Electron Diffraction ◽  
Transmission Electron ◽  
Cuo Nanocrystals

Nanocrystalline CuO with shuttle-morphology has been prepared conventionally by a microwave irradiation heating technique from an aqueous system in the presence of Cu(CH3COO)2• H2O and NaOH at room temperature. The X-ray powder diffraction pattern indicates that the product is indicated that the product was pure monoclinic phase of CuO. Further characterized by transmission electron microscopy, selected area electron diffraction, X-ray photoelectron spectroscopy and Raman spectra, the component of the products were confirmed.

scholarly journals Magnetic Au-Ag-γ-Fe2O3/rGO Nanocomposites as an Efficient Catalyst for the Reduction of 4-Nitrophenol

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 877 ◽  
Author(s):  
Guangyu Lei ◽  
Jingwen Ma ◽  
Zhen Li ◽  
Xiaobin Fan ◽  
Wenchao Peng ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Catalytic Performance ◽  
Reduction Reaction ◽  
X Ray Diffraction ◽  
Efficient Catalyst ◽  
Reaction Systems ◽  
X Ray ◽  
Transmission Electron ◽  
The Impact

In this paper, a facile route has been developed to prepare magnetic trimetallic Au-Ag-γ-Fe2O3/rGO nanocomposites. The impact of the preparation method (the intensity of reductant) on the catalytic performance was investigated. The nanocomposites were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The prepared nanocomposites show fine catalytic activity towards the reduction reaction of 4-nitrophenol (4-NP). The nanocomposites also have superparamagnetism at room temperature, which can be easily separated from the reaction systems by applying an external magnetic field.

scholarly journals The Influence of Annealing on the Optical Properties and Microstructure Recrystallization of the TiO2 Layers Produced by Means of the E-BEAM Technique

Materials ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 5863
Author(s):  
Katarzyna Jurek ◽  
Robert Szczesny ◽  
Marek Trzcinski ◽  
Arkadiusz Ciesielski ◽  
Jolanta Borysiuk ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Dielectric Films ◽  
X Ray ◽  
Force Microscopy ◽  
Titanium Dioxide Films ◽  
Transmission Electron ◽  
Two Phases ◽  
Beam Technique

Titanium dioxide films, about 200 nm in thickness, were deposited using the e-BEAM technique at room temperature and at 227 °C (500K) and then annealed in UHV conditions (as well as in the presence of oxygen (at 850 °C). The fabricated dielectric films were examined using X-ray powder diffraction, Raman spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy, scanning electron microscopy, transmission electron microscopy, and spectroscopic ellipsometry. The applied experimental techniques allowed us to characterize the phase composition and the phase transformation of the fabricated TiO2 coatings. The films produced at room temperature are amorphous but after annealing consist of anatase crystallites. The layers fabricated at 227 °C contain both anatase and rutile phases. In this case the anatase crystallites are accumulated near the substrate interface whilst the rutile crystallites were formed closer to the surface of the TiO2 film. It should be emphasized that these two phases of TiO2 are distinctly separated from each other.

Wet Synthesis and Characterization of MSe (M = Cd, Hg) Nanocrystallites at Room Temperature

2002 ◽  
Vol 17 (5) ◽  
pp. 1147-1152 ◽  
Author(s):  
Qing Yang ◽  
Kaibin Tang ◽  
Chunrui Wang ◽  
Chunjuan Zhang ◽  
Yitai Qian
Keyword(s):  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Blue Shift ◽  
Nanocrystalline Powders ◽  
Hydrothermal Conditions ◽  
Metal Chlorides ◽  
X Ray ◽  
Transmission Electron ◽  
Sodium Selenosulfate ◽  
Wet Synthesis

Semiconductor selenides of MSe (M = Cd, Hg) nanocrystalline powders were synthesized through the reactions between metal chlorides and sodium selenosulfate in the ammoniacal aqueous solution at room temperature for 6–10 h. The samples were characterized by x-ray powder diffraction, transmission electron microscopy, electron diffraction, x-ray photoelectron spectroscopy, and elemental analysis. The average diameters of CdSe and HgSe nanocrystallites are 4 and 8 nm, respectively. The storage and an interesting phase transition under hydrothermal conditions have been presented. The absorption spectrum of the as-prepared samples exhibits obvious blue shift due to the size confinement.

Desulfurization Performance with ZnO Nanocrystalline to Eliminate H2S at Room Temperature

2007 ◽  
Vol 121-123 ◽  
pp. 1325-1328
Author(s):  
Chun Hong Shao ◽  
A.X. Jiang ◽  
F. Li ◽  
B. Yan ◽  
X.K. Li ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Room Temperature ◽  
Precipitation Process ◽  
Homogeneous Precipitation ◽  
Activity Time ◽  
X Ray ◽  
Transmission Electron ◽  
Zno Powders

Nanocrystalline ZnO powders, whose crystalline sizes were 14.3, 21.2, 24.1, and 35.3 nm, respectively, were prepared by homogeneous precipitation process. Nanocrystalline ZnO powders were characterized with powder X-ray diffractometer (XRD), transmission electron microscopy (TEM) and X ray photoelectron spectroscopy (XPS). The performance of desulfurization of H2S at room temperature was investigated. Results demonstrated that the smaller the size of nanocrystalline ZnO, the darker the color of desulfurization products would be, which was more similar to the characteristics of multi-sulfide results, indicating that the mechanism of desulfurization of nanocrystalline ZnO was not the same as that of the analytical pure ZnO. Nanocrystalline ZnO improved the performance of desulfurization of H2S at room temperature, and the activity time of nanocrystalline ZnO (14.3 nm) for the desulfurization was 34 times that of analytical pure ZnO at absence of oxygen. When the oxygen was present in reaction, the accuracy of desulfurization was improved, in which H2S was prone to be oxidized into element S, and SO2 was not detected at outlet of the reactor.

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