Preparation and Tribological Properties of Modified Field’s Alloy Nanoparticles as Additives in Liquid Poly-alfa-olefin Solution

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Chaoming Wang ◽  
Xinran Zhang ◽  
Wenbing Jia ◽  
Qiaoyuan Deng ◽  
Yongxiang Leng
Keyword(s):  
Zeta Potential ◽  
Tribological Properties ◽  
Alloy Nanoparticles ◽  
Wear Scar Diameter ◽  
Transmission Electron ◽  
Wear And Friction ◽  
One Step ◽  
Size And Morphology ◽  
Surface Modified ◽  
Surface Modified Nanoparticles

This study described the synthesis and the tribological properties of surface-modified Field’s alloy nanoparticles, which were prepared by a facile one-step nanoemulsion method and using ethyl carbamate as a surfactant, as additives in liquid poly-alfa-olefin (PAO) oil. The size and morphology of nanoparticles were investigated by transmission electron microscopy (TEM). The zeta potential, viscosity, and stability properties of the surface-modified nanoparticles suspended in PAO oil (called nanofluid) with different mass concentrations were measured by a viscometer and Zeta potential analyzer, respectively. The tribological properties of the nanofluid were tested by a ball to disk wear and friction machine. Compared with pure PAO oil, the results showed that the nanofluids had better lubricating behaviors. When the mass concentration of modified nanoparticles was 0.08 wt. %, both the friction coefficient and the wear scar diameter were the lowest.

scholarly journals Characterization and Nanofluid Stability of CoFe2O4-APTES and CoFe2O4-PVA Nanoparticles

2020 ◽  
Vol 78 (1) ◽  
pp. 79-87
Author(s):  
Anis Arisa Roslan ◽  
Hasnah Mohd Zaid ◽  
Siti Nur Azella Zaine ◽  
Mursyidah Umar ◽  
Beh Hoe Guan
Keyword(s):  
Surface Modification ◽  
Zeta Potential ◽  
Performance Studies ◽  
Colloidal Stability ◽  
Amino Silane ◽  
Cobalt Iron Oxide ◽  
One Step ◽  
The Stability ◽  
Surface Modified ◽  
Surface Modified Nanoparticles

Nanofluid contains nanoparticles that enhanced the property of the base fluid. However, the separating layer between the nanoparticles and base fluids may interfere the nanofluids performance. Studies have been made that surface modification of nanoparticles may improve the dispersion of nanoparticles in base fluids. This paper reports the study of the colloidal stability of surface modified nanoparticles using a polymer and an amino-silane. The nanoparticles were prepared by one-step and two-step methods using cobalt iron oxide nanoparticles with brine solution and deionized water as the base fluids. Functionalization by surface modification of the nanoparticles to enhance the nanofluids stability was carried out using (3-aminopropyl) triethoxysilane (APTES) and polyvinyl alcohol (PVA). Characterization using Fourier Transform Infrared (FTIR), Field Emission Scanning Electron Microscope (FESEM) and X-ray Powder Diffraction (XRD) were performed to study the functionality and morphology of the synthesized nanoparticles. The extra IR peaks such as Si-O-Si at 1063 cm-1 for CoFe2O4-APTES and C=O at 1742 cm-1 for CoFe2O4-PVA showed that there are additional elements in the cobalt ferrite due to functionalization. The size of synthesized CoFe2O4-APTES ranged between 15.99 nm to 26.89 nm while CoFe2O4-PVA is from 25.70 nm to 54.16 nm. The stability of the nanofluid were determined via zeta potential measurements. CoFe2O4-APTES nanofluid has zeta potential of -35.7 mV compared to CoFe2O4-PVA at -15.5 mV.

scholarly journals Tribological properties of novel palygorskite nanoplatelets used as oil-based lubricant additives

Friction ◽  
2020 ◽  
Vol 9 (2) ◽  
pp. 332-343 ◽  
Author(s):  
Kunpeng Wang ◽  
Huaichao Wu ◽  
Hongdong Wang ◽  
Yuhong Liu ◽  
Lv Yang ◽  
...  
Keyword(s):  
Tribological Properties ◽  
Magnesium Silicate ◽  
Treatment Method ◽  
Lubricant Additives ◽  
Wear Volume ◽  
Wear Scar Diameter ◽  
Tribochemical Reaction ◽  
Base Oil ◽  
Transmission Electron ◽  
Ball Surface

AbstractLayered palygorskite (PAL), commonly called attapulgite, is a natural inorganic clay mineral composed of magnesium silicate. In this study, an aqueous miscible organic solvent treatment method is adopted to prepare molybdenum-dotted palygorskite (Amo-PMo) nanoplatelets, which greatly improved the specific surface area of PAL and the dispersion effect in an oil-based lubricant system. Their layered structure and size were confirmed using transmission electron microscopy (TEM) and atomic force microscopy. Following a tribological test lubricated with three additives (PAL, organic molybdenum (SN-Mo), and Amo-PMo), it was found that the sample of 0.5 wt% Amo-PMo exhibited the best tribological properties with a coefficient of friction of 0.09. Moreover, the resulting wear scar diameter and wear volume of the sliding ball surface were 63% and 49.6% of those lubricated with base oil, respectively. Its excellent lubricating performance and self-repairing ability were mainly attributed to the generated MoS2 adsorbed on the contact surfaces during the tribochemical reaction, thereby effectively preventing the direct collision between asperities on sliding solid surfaces. Thus, as-prepared Amo-PMo nanoplatelets show great potential as oil-based lubricant additives, and this study enriches the existing application of PAL in industry.

Control of ZnO Morhpology by Solution Route

2001 ◽  
Vol 692 ◽  
Author(s):  
Lingdong Sun ◽  
Jun Zhang ◽  
Chunsheng Liao
Keyword(s):  
Electron Microscope ◽  
Materials Science ◽  
Hexagonal Structure ◽  
Inorganic Materials ◽  
Rich Variety ◽  
Transmission Electron ◽  
One Step ◽  
Particle Size And Morphology ◽  
Solution Route ◽  
Size And Morphology

AbstractIn this paper, ZnO with a rich variety of well-defined morphologies have been achieved by solution route using different kind of precursors, which can prepare particles by only one step without calcination. The influences of solvent, and temperature on the particle size and morphology of ZnO were investigated. It was revealed by the scanning electron microscope (SEM) and transmission electron microscope (TEM) images that the morphological feature of ZnO can be controlled as rod-, polyhedron-, fluffy sphere-, snowflake- and flower-like, etc. XRD measurement showed that all of the ZnO samples with different morphologies has the same hexagonal structure, which is well consistent with electron diffraction (ED) characterization. This communication not only provides promising candidates for materials science due to the importance of shape in relationship with materials, but also presents an effective route to synthesize the well-defined inorganic materials.

scholarly journals One-Step Synthesis of Superparamagnetic Fe3O4@PANI Nanocomposites

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Sanjeev Kumar ◽  
Sapna Jain
Keyword(s):  
Gain Control ◽  
Average Diameter ◽  
Reverse Microemulsion ◽  
Synthetic Approach ◽  
X Ray Diffraction ◽  
X Ray ◽  
Iron Source ◽  
Transmission Electron ◽  
One Step ◽  
Size And Morphology

Monodisperse Fe3O4@PANI(Polyaniline) nanocomposites were successfully synthesized at ambient temperature via reverse microemulsion technique with the objective to gain control over the size and morphology of these nanocomposites. The present synthetic approach uses inexpansive FeCl3as a single iron source to prepare Fe3O4@PANI nanocomposites by the reverse microemulsion method. The obtained samples were characterized in detail by Fourier transform infrared spectroscopy, X-ray diffraction, transmission electron microscopy, and vibrating sample magnetometer. FTIR and X-ray diffractogram confirm the encapsulation of Fe3O4nanoparticles by PANI. Highly monodisperse spherical Fe3O4@PANI nanocomposites with an average diameter of 60 nm have been produced. The-synthesized nanocomposites exhibit superparamagnetic behavior at room temperature under applied field. Also a novel mechanism employing FeCl3as a single iron source polymerizing aniline and simultaneously forming Fe3O4is discussed.

IN VITRO EVALUATION OF LECTINIZED CISPLATIN BEARING LIPOSOMES SYSTEM

2020 ◽  
pp. 60-64
Author(s):  
RAHUL TIWARI ◽  
KALIYAPERUMAL VISWANATHAN ◽  
SURESH PRASAD VYAS ◽  
VANDANA SONI
Keyword(s):  
Particle Size ◽  
Zeta Potential ◽  
Wheat Germ Agglutinin ◽  
Wheat Germ ◽  
Entrapment Efficiency ◽  
Cancer Drug ◽  
Drug Molecules ◽  
Transmission Electron ◽  
Surface Modified

Objective: The purpose of this study was to evaluate the extent and mechanism anti-cancer drug-loaded liposomes using wheat germ agglutinin as a guiding molecule. Methods: For the drug-loaded liposome synthesis, the thin film hydration method was used and the drug cisplatin was loaded during the synthesis and followed by the surface modification using wheat germ agglutinin (WGA) lectin. The developed system was confirmed based on transmission electron microscopy (TEM), atomic force microscopy (AFM), particle size (PS) analyzer, polydispersity index and Zeta Potential analyzer. Results: The results showed the surface modified by liposomes had the particle size 200±5 nm. The wheat germ agglutinin coated on the surface to liposome led to a reduction in zeta potential and drug entrapment efficiency while particle size increased. Plain liposomes containing cisplatin had less effect than WGA modified liposome on MCF-7 cell lines. Conclusion: The MTT studies indicated that the drug molecules were initially get delivered to the inside the cell. This formulation offered new simple approach and effectively kill the cells via targeting the nucleus.

Preparation and Properties of BR/SBR Blends Using Surface-Modified Nano Zinc Oxide

2014 ◽  
Vol 910 ◽  
pp. 101-104 ◽  
Author(s):  
Jin Yu Qi ◽  
Li Xin Wu ◽  
Dong Xian Zhuo
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Sol Gel ◽  
Tensile Modulus ◽  
Nano Zinc Oxide ◽  
Transmission Electron ◽  
Cure Time ◽  
Size And Morphology ◽  
Nano Zinc ◽  
Surface Modified

nanozinc oxide (n-ZnO) was synthesized by sol-gel method. The surface of n-ZnO was modified by a silane coupling agent. The modified n-ZnO was then used as rubber vulcanizing activator and nanofiller for BR/SBR blends. The size and morphology of n-ZnO were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The effects of modified n-ZnO on cure characteristics, mechanical properties and thermal conductivity of BR/SBR blends were tested and analyzed. The use of modified n-ZnO resulted in less optimum cure time (t90), higher mechanical properties (anti-abrasion, tear strength, tensile strength, tensile modulus) and thermal conductivity at lower content compared to the conventional micro ZnO(c-ZnO).

Production of nearly monodisperse Fe3O4 and Fe@Fe3O4 nanoparticles in aqueous medium and their surface modification for biomedical applications

2017 ◽  
Vol 31 (04) ◽  
pp. 1750014 ◽  
Author(s):  
Tirusew Tegafaw ◽  
Wenlong Xu ◽  
Sang Hyup Lee ◽  
Kwon Seok Chae ◽  
Yongmin Chang ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Photoelectron Spectroscopy ◽  
Quantum Interference ◽  
Biomedical Applications ◽  
Ir Absorption ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Surface Modified ◽  
Surface Modified Nanoparticles

Iron (Fe)-based nanoparticles are extremely valuable in biomedical applications owing to their low toxicity and high magnetization values at room temperature. In this study, we synthesized nearly monodisperse iron oxide (Fe3O4) and Fe@Fe3O4 (core: Fe, shell: Fe3O[Formula: see text] nanoparticles in aqueous medium under argon flow and then, coated them with various biocompatible ligands and silica. In this study, eight types of surface-modified nanoparticles were investigated, namely, Fe3O4@PAA (PAA = polyacrylic acid; [Formula: see text] of PAA = 5100 amu and 15,000 amu), Fe3O4@PAA–FA (FA = folic acid; [Formula: see text] of PAA = 5100 amu and 15,000 amu), Fe3O4@PEI–fluorescein (PEI = polyethylenimine; [Formula: see text] of PEI = 1300 amu), Fe@Fe3O4@PEI ([Formula: see text] of PEI = 10,000 amu), Fe3O4@SiO2 and Fe@Fe3O4@SiO2 nanoparticles. We characterized the prepared surface-modified nanoparticles using high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) absorption spectroscopy, a superconducting quantum interference device (SQUID), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy and confocal microscopy. Finally, we measured the cytotoxicity of the samples. The results indicate that the surface-modified nanoparticles are biocompatible and are potential candidates for various biomedical applications.

Tribological properties of nanometer Al2O3 and nanometer ZnO as additives in lithium-based grease

2018 ◽  
Vol 70 (6) ◽  
pp. 953-960 ◽  
Author(s):  
Qiang He ◽  
Zhigang Wang ◽  
Anling Li ◽  
Yachen Guo ◽  
Songfeng Liu
Keyword(s):  
Tribological Properties ◽  
Wear Scar ◽  
Composite Nanoparticles ◽  
Wear Testing ◽  
Wear Scar Diameter ◽  
Lithium Grease ◽  
Content Type ◽  
Wear And Friction ◽  
Friction Reducing ◽  
Base Grease

Purpose Nanoparticles as the grease additives play an important role in anti-wear and friction-reducing property during the mechanical operation. To improve the lubrication action of grease, the tribological behavior of lithium-based greases with single (nanometer Al2O3 or nanometer ZnO) and composite additives (Al2O3–ZnO nanoparticles) were investigated in this paper. Design/methodology/approach The morphology and microstructure of nanoparticles were characterized by means of transmission electron microscope and X-ray diffraction. Tribological properties of different nanoparticles as additives in lithium-based greases were evaluated using a universal friction and wear testing machine. In addition, the friction coefficient (COF) and wear scar diameter were analyzed. The surface morphology and element overlay of the worn steel surface were analyzed by scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS), respectively. Findings The results show that the greases with nanometer Al2O3 or nanometer ZnO and the composite nanoparticles additives both exhibit lower COFs and wear scar diameters than those of base grease. And the grease with Al2O3–ZnO composite nanoparticles possesses much lower COF and shows much better wear resistance than greases with single additives. When the additives contents are 0.4 Wt.% Al2O3 and 0.6 Wt.% ZnO, the composite nanoparticles-based grease exhibits the lowest mean COF (0.04) and wear scar diameter (0.65 mm), which is about 160% and 28% lower than those of base grease, respectively. Originality/value The main innovative thought of this work lies in dealing with the grease using single or composite nanoparticles. And through a serial contrast experiments, the anti-wear and friction-reducing property with different nanoparticles additives in lithium grease are evaluated.

An Interactive Minicomputer Program for the Indexing and Simulation of Electron Diffraction Patterns

1976 ◽  
Vol 34 ◽  
pp. 542-543
Author(s):  
R.P. Goehner ◽  
W.T. Hatfield ◽  
Prakash Rao
Keyword(s):  
Electron Diffraction ◽  
Real Time ◽  
Pattern Analysis ◽  
Flow Diagram ◽  
Hard Copy ◽  
Time Analysis ◽  
Real Time Analysis ◽  
Transmission Electron ◽  
One Step ◽  
Diffraction Patterns

Computer programs are now available in various laboratories for the indexing and simulation of transmission electron diffraction patterns. Although these programs address themselves to the solution of various aspects of the indexing and simulation process, the ultimate goal is to perform real time diffraction pattern analysis directly off of the imaging screen of the transmission electron microscope. The program to be described in this paper represents one step prior to real time analysis. It involves the combination of two programs, described in an earlier paper(l), into a single program for use on an interactive basis with a minicomputer. In our case, the minicomputer is an INTERDATA 70 equipped with a Tektronix 4010-1 graphical display terminal and hard copy unit.A simplified flow diagram of the combined program, written in Fortran IV, is shown in Figure 1. It consists of two programs INDEX and TEDP which index and simulate electron diffraction patterns respectively. The user has the option of choosing either the indexing or simulating aspects of the combined program.

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