scholarly journals Synthesis, Characterization, and Tribological Behavior of Oleic Acid Capped Graphene Oxide

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Tiedan Chen ◽  
Yanqiu Xia ◽  
Zhengfeng Jia ◽  
Zhilu Liu ◽  
Haobo Zhang
Keyword(s):  
Graphene Oxide ◽  
Oleic Acid ◽  
Friction And Wear ◽  
Graphite Powder ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Transmission Electron ◽  
Alpha Olefin ◽  
Ir Transmission ◽  
Ft Ir

Graphene oxide (GO) nanosheets were prepared by modified Hummers and Offeman methods. Furthermore, oleic acid (OA) capped graphene oxide (OACGO) nanosheets were prepared and characterized by means of Fourier transform-infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), and X-ray diffraction (XRD). At the same time, the friction and wear properties of OA capped graphite powder (OACG), OACGO, and oleic acid capped precipitate of graphite (OACPG) as additives in poly-alpha-olefin (PAO) were compared using four-ball tester and SRV-1 reciprocating ball-on-disc friction and wear tester. By the addition of OACGO to PAO, the antiwear ability was improved and the friction coefficient was decreased. Also, the tribological mechanism of the GO was investigated.

Carbon Nanotube Templated Growth of the Nano-Crystalline NaY Zeolite

2011 ◽  
Vol 194-196 ◽  
pp. 594-597
Author(s):  
Ke Tang ◽  
Xin Hong ◽  
Jin Gang Qi
Keyword(s):  
Structural Characteristics ◽  
Internal Diameter ◽  
X Ray Diffraction ◽  
Nay Zeolite ◽  
Nano Crystalline ◽  
Transmission Electron ◽  
Ir Transmission ◽  
Ft Ir ◽  
Nay Zeolites ◽  
Nanosized Zeolites

FAU-type(NaY) zeolites nanocrystals have been synthesized through crystallization of gel in mesoporous system of carbon nanotubes(CNTS) with a internal diameter of 20~30 nm. Investigation by using X-ray diffraction (XRD), Fourier transform infrared (FT-IR), transmission electron microscope (TEM) shows that the nanocrystals possess the typical nanosized zeolites structural characteristics which is different from those of microsized zeolites.

scholarly journals Influence of different synthesis conditions on properties of oleic acid-coated-Fe3O4 nanoparticles

2015 ◽  
Vol 33 (1) ◽  
pp. 100-106 ◽  
Author(s):  
Atieh Aliakbari ◽  
Majid Seifi ◽  
Sharareh Mirzaee ◽  
Hoda Hekmatara
Keyword(s):  
Oleic Acid ◽  
Room Temperature ◽  
Magnetic Measurement ◽  
Precursor Solution ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Synthesis Conditions ◽  
Transmission Electron ◽  
Ft Ir

AbstractIn the present paper, iron oxide nanoparticles coated by oleic acid have been synthesized in different conditions by coprecipitation method. For investigating the effect of time spent on adding the oleic acid to the precursor solution, two different processes have been considered. The as synthesized samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and Fourier transform infrared spectroscopy (FT-IR). Magnetic measurement was carried out at room temperature using a vibrating sample magnetometer (VSM). The results show that the magnetic nanoparticles decorated with oleic acid decreased the saturation of magnetization. From the data, it can also be concluded that the magnetization of Fe3O4/oleic acid nanoparticles depends on synthesis conditions.

Poly(L-Lactide) Composite Nanofibers Incorporating POSS-MWNTs

2011 ◽  
Vol 175-176 ◽  
pp. 341-344 ◽  
Author(s):  
Byoung Suhk Kim ◽  
Kyu Oh Kim ◽  
Ick Soo Kim
Keyword(s):  
Composite Nanofibers ◽  
X Ray Diffraction ◽  
Multiwalled Carbon ◽  
Raman Analysis ◽  
X Ray ◽  
Polyhedral Oligosilsesquioxane ◽  
Hybrid Nanofibers ◽  
Transmission Electron ◽  
Ir Transmission ◽  
Ft Ir

We report the electrospun poly(L-lactide) (PLA) nanofibers incorporating polyhedral oligosilsesquioxane (POSS)-modified multiwalled carbon nanotubes (MWNTs). FT-IR, transmission electron microscopy (TEM) and Raman analysis confirmed the existence of POSS macromers bonded to the MWNTs as an extra phase. The thermal and microstructure properties of the PLA hybrid nanofibers with POSS-modified MWNTs were investigated by thermogravimetric analysis (TGA) and Wide-angle X-ray diffraction (WAXD).

Synthesis and Characterization of Structure of Fe3O4@Graphene Oxide Nanocomposites

2016 ◽  
Vol 25 (6) ◽  
pp. 096369351602500 ◽  
Author(s):  
Ruimin Fu ◽  
Mingfu Zhu
Keyword(s):  
Graphene Oxide ◽  
Drug Carrier ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Ft Ir ◽  
Co Precipitation ◽  
Ft Ir Spectroscopy

Nowadays, the hummers method for preparation of graphene oxide (GO) was improved. The grapheme oxide @ Fe3O4 magnetic nanocomposites were synthesized by co-precipitation method. After analysing the morphology and structure of obtained nanocomposites by X-ray diffraction (XRD), transmission electron microscope (TEM) and Fourier transform infrared (FT-IR) spectroscopy, the result was shown as follows. The particle size of Fe3O4 in nanocomposites is 30 nm. Many functional groups are found in grapheme oxide, and such groups could be used to bind with the drug. In the test for magnetic properties, the nanocomposites gathered rapidly in the vicinity of the permanent magnet. The nanocomposites, with high superparamagnetism, can be used in the following applications: drug targeting transports, drug carrier, and diagnosis assistant system.

scholarly journals Polyethylenimine-Modified Magnetic Chitosan for the Uptake of Arsenic from Water

2021 ◽  
Vol 11 (12) ◽  
pp. 5630
Author(s):  
Norah Salem Alsaiari ◽  
Fatimah Mohammed Alzahrani ◽  
Khadijah Mohammedsaleh Katubi ◽  
Abdelfattah Amari ◽  
Faouzi Ben Rebah ◽  
...  
Keyword(s):  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
Arsenic Uptake ◽  
Magnetic Chitosan ◽  
Adsorbent Dosage ◽  
Transmission Electron ◽  
Global Environmental ◽  
Removal Of Heavy Metals ◽  
Ir Transmission ◽  
Ft Ir

The removal of heavy metals from water has become a global environmental problem. Various materials have been applied as adsorbent to remove metals from water. In this field, nanomaterials have been gaining increasing interest due to their exceptional properties. In this work, we discuss the synthesis of a core-shell structure nanocomposite by the modification of magnetic chitosan (CS) (Fe3O4/CS) with polyethylenimine (PEI) to produce Fe3O4/CS/PEI composite for the adsorption of arsenic ions (As(V) and As(III)) from aqueous solution. The synthesized materials were characterized using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), transmission electron microscope (TEM), and vibrating sample magnetometer (VSM). The results indicated the successful combination of three components of the nanocomposite. The adsorption conditions were optimized by studying the effect of different parameters included pH, contact time, initial concentration, and adsorbent dosage. The optimum adsorption pH was found to be 6.7 while the optimum adsorbent dosage was found to be 2.0 and 1.5 g/L for As(III) and As(V), respectively. The removal efficiency for the uptake of As(III) and As(V) ions over Fe3O4/CS/PEI nanocomposite at optimum conditions was found to be 99.5 and 99.7%, respectively. The experimental results were fitted using Freundlich’s and Langmuir’s isotherms. The data were more fitted to Langmuir isotherm providing a suggestion of monolayer adsorption with maximum adsorption capacity equal to 77.61 and 86.50 mg/g for the removal of As(III) and As(V), respectively. Moreover, linear regression coefficient (R2) indicated that the adsorption of arsenic ions over the synthesized magnetic nanocomposite obeyed pseudo 2nd order suggesting the chemisorption process. The reusability of the nanosorbent for arsenic uptake using sodium hydroxide as eluent was also assessed up to five cycles. Interestingly, Fe3O4/CS/PEI nanocomposite can be considered as a promising adsorbent for As ions’ removal from water and should be tested for the removal of other pollutants.

Carbon Nanotube Templated Growth of Nano-Crystallinity ZSM-5

2011 ◽  
Vol 299-300 ◽  
pp. 1020-1023 ◽  
Author(s):  
Ke Tang ◽  
Xin Hong
Keyword(s):  
Carbon Nanotubes ◽  
Electron Microscope ◽  
Structural Characteristics ◽  
Carbon Matrix ◽  
Internal Diameter ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Ir Transmission ◽  
Ft Ir ◽  
Nanosized Zeolites

MFI-type(ZSM-5) zeolite nanocrystals with SiO2/Al2O3ratios of 100 has been synthesized through crystallization of gel in mesoporous system of carbon nanotubes(CNTS) with internal diameter of 20~30nm. Investigation by using X-ray diffraction (XRD), Fourier transform infrared (FT-IR), transmission electron microscope (TEM) and scanning electron microscope (SEM) shows that the nanocrystals possess the typical nanosized zeolites structural characteristics which is different from those of microsized zeolites. Compared with those of the corresponding sample synthesized in hydrothermal system, the bands of the nanosized sample are shifted slightly to lower or higher wavenumbers. The TEM images of the purified carbon nanotubes and nanosized ZSM-5 crystals after the removal of the carbon matrix suggest that clean and homogeneous carbon nanotubes have internal diameters of approximately 20~30 nm and the most crystal sizes are in the range 30~60nm. The SEM photograph verifies the existing of nanosized ZSM-5.

Synthesis of MIL-125/Graphene Oxide Composites and Hydrogen Storage Properties

2017 ◽  
Vol 727 ◽  
pp. 683-687 ◽  
Author(s):  
Tian Bao Yang ◽  
Li Xian Sun ◽  
Fen Xu ◽  
Zi Qiang Wang ◽  
Yong Jin Zou ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Graphene Oxide ◽  
Hydrogen Storage ◽  
Parent Material ◽  
X Ray Diffraction ◽  
Hydrogen Storage Properties ◽  
Transmission Electron ◽  
Metal Organic ◽  
Ft Ir ◽  
Storage Properties

Metal-organic frameworks (MOFs: MIL-125)-graphene oxide (GO) composite (MO) was synthesized by solvothermal method. All the materials were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), high resolution transmission electron microscopy (HRTEM), Fourier transform infrared spectroscopy (FT-IR) and Raman spectroscopy. Then their hydrogen storage properties were systematically tested under 1 bar and 77K. The composite material MO-1 possesses higher surface area than the parent material MIL-125 and shows a remarkable H2 capacity up to 2.5 wt% (38% increases vs. MIL-125).

One-Pot Shear Synthesis of Gallium, Indium, and Indium–Bismuth Nanofluids: An Experimental and Computational Study

2013 ◽  
Vol 4 (4) ◽  
Author(s):  
Anne K. Starace ◽  
Joongoo Kang ◽  
Junyi Zhu ◽  
Judith C. Gomez ◽  
Greg C. Glatzmaier
Keyword(s):  
Oleic Acid ◽  
Density Functional ◽  
Computational Study ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
One Pot ◽  
Heat Transfer Fluids ◽  
Transmission Electron ◽  
Alpha Olefin ◽  
One Step

Nanofluids are often proposed as advanced heat transfer fluids. In this work, using a one-step nanoemulsification method, we synthesize gallium, indium, and indium–bismuth nanofluids in poly-alpha-olefin (PAO). The size distributions of the resulting nanoparticles are analyzed using transmission electron microscopy (TEM). X-ray diffraction (XRD) analysis of the alloy nanoparticles indicates that their composition is the same as that of the bulk alloy. It was found that oleylamine stabilizes both gallium and indium particles in PAO, while oleic acid is effective for gallium particles only. The microscopic adsorption mechanism of surfactants on gallium and indium surfaces is investigated using density functional theory (DFT) to understand why oleylamine is effective for both metals while oleic acid is effective for gallium only.

Facile biosynthesis of reduced graphene oxide nanostructures via reduction by tagetes erecta (marigold flower) plant extract

2018 ◽  
Vol 32 (19) ◽  
pp. 1840068 ◽  
Author(s):  
Shivanjali Shahane ◽  
Deepti Sidhaye
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Graphite Powder ◽  
Tagetes Erecta ◽  
X Ray Diffraction ◽  
Oxide Nanostructures ◽  
Transmission Electron ◽  
Flower Plant ◽  
Reduced Graphene ◽  
Typical Experiment

In this paper, we report the development of a new green, eco-friendly pathway for the synthesis of reduced graphene oxide (RGO). In a typical experiment, graphene oxide (GO) was prepared by the oxidation of graphite powder using Hummer’s method. Prepared GO was then subjected to reduction by using extract of Tagetes erecta (Marigold flower). The samples were characterized by various techniques such as X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Fourier Transform Infrared (FTIR) spectroscopy and Raman spectroscopy. RGO synthesized in this work is being probed for diverse applications including biomedical applications.

Synthesis and Characterization of GO-Chit-Ni Nanocomposite as a Recoverable Nanocatalyst for Reducing Nitroarenes in Water

2020 ◽  
Vol 17 (7) ◽  
pp. 523-531
Author(s):  
Mosayeb Sarvestani ◽  
Roya Azadi
Keyword(s):  
Fourier Transforms ◽  
Considerable Change ◽  
Environmentally Benign ◽  
X Ray Diffraction ◽  
Simple Method ◽  
Transmission Electron ◽  
Ir Transmission ◽  
Aryl Amines ◽  
Ft Ir

In the present study, nickel nanoparticles (Ni-NPs) immobilized on graphene oxide-chitosan (GO-Chit-Ni) have been synthesized and characterized as a catalyst for reduction of nitroarenes in water. For this purpose, GO has been functionalized with chitosan (GO-Chit). Then, Ni-NPs were immobilized on the surface of GO-Chit using a simple method. The GO-Chi-Ni nanocomposites were characterized using Fourier Transforms Infrared Spectroscopy (FT-IR), Transmission Electron Microscopy (TEM), X-Ray Diffraction Measurements (XRD), and Atomic Adsorption Spectrometry (AAS). The GO-Chi-Ni nanoparticles demonstrated appropriate catalytic activity in reducing nitroarenes to aryl amines in the existence of sodium borohydride (NaBH4) aqueous solution as a hydrogen source at 80oC. This catalytic system applies environmentally benign water as a solvent that is cheap, easily accessible, non-toxic, non-volatile, non-flammable and thermally stable. This type of catalyst can be applied several times with no considerable change in its performance.

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