Utilisation of Nanosize Powder (Montmorillonite) for Compounding Lightweight Polymer Products

2012 ◽  
Vol 28 (2) ◽  
pp. 741-748
Author(s):  
NUSOIBAH NAAHIDHAH RUKMAN ◽  
SITI ZALEHA SA’AD ◽  
ROZANA MOHD DAHAN
Keyword(s):  
Nanosize Powder

scholarly journals Jet-Impingement Effects of Alumina-Nanofluid on Aluminum and Copper

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Gustavo J. Molina ◽  
Fnu Aktaruzzaman ◽  
Whitney Stregles ◽  
Valentin Soloiu ◽  
Mosfequr Rahman
Keyword(s):  
Ethylene Glycol ◽  
Base Fluid ◽  
Cooling System ◽  
Jet Impingement ◽  
Surface Modifications ◽  
Optical Microscope ◽  
Cooling Fluid ◽  
Nanosize Powder ◽  
Alumina Nanofluid ◽  
Surface Changes

Nanofluids are nanosize-powder suspensions that are of interest for their enhanced thermal transport properties. They are studied as promising alternatives to ordinary cooling fluids, but the tribiological effects of nanofluids on cooling-system materials are largely unknown. The authors have developed methodology that uses jet impingement on typical cooling-system materials to test such effects. The work is presented of the authors’ research on the interactions of a typical nanofluid (2% volume of alumina nanopowders in a solution of ethylene glycol in water) which is impinged on aluminum and copper specimens for tests as long as 112 hours. The surface changes were assessed by roughness measurements and optical-microscope studies. Comparative roughness indicate that both the reference cooling fluid of ethylene glycol and water and its nanofluid with 2% alumina produce roughness changes in aluminum (even for the shortest 3-hour test), but no significant roughness differences were observed between them. No significant roughness changes were observed for copper. Microscopy observations, however, show different surface modifications in both aluminum and copper by both the nanofluid and its base fluid. The possible mechanisms of early erosion are discussed. These investigations demonstrate suitable methods for the testing of nanofluid effects on cooling system-materials.

Pulsed wire discharge for nanosize powder synthesis

1998 ◽  
Vol 26 (5) ◽  
pp. 1498-1501 ◽  
Author(s):  
Weihua Jiang ◽  
K. Yatsui
Keyword(s):  
Powder Synthesis ◽  
Pulsed Wire Discharge ◽  
Nanosize Powder

Purification of Aluminum Nitride Nanosize Powder Synthesized by Pulsed Wire Discharge

2013 ◽  
pp. 61-68
Author(s):  
C. Cho ◽  
Y. Kinemuchi ◽  
T. Suzuki ◽  
H. Suematsu ◽  
W. Jiang ◽  
...  
Keyword(s):  
Aluminum Nitride ◽  
Pulsed Wire Discharge ◽  
Nanosize Powder

scholarly journals Study on Crystallization and Magnetic Property Deviation of Ni-Zn-Cu Ferrite Depending on the State of the Starting Material in the Annealing Process

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Su-won Yang ◽  
Kwang-pil Jeong ◽  
Jeong-gon Kim
Keyword(s):  
Magnetic Properties ◽  
Magnetic Property ◽  
Coercive Force ◽  
Spinel Structure ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Annealing Process ◽  
Crystal Formation ◽  
Sol Gel Process ◽  
Nanosize Powder

The spinel structure of the nanosize powder (Ni0.3Zn0.3Cu0.4Fe2O4) substituted by Ni, Zn, and Cu was fabricated by the sol-gel process. Changes in weight, crystal formation, and magnetic properties were observed by XRD, TG-DTA, VSM in the annealing process of the sol and gel. The saturation magnetization of the sol showed 54.8–58.6 emu/g at 500–800°C, and the gel showed 52.3–56.8 emu/g at 600–800°C. The coercive force of the sol decreased in the range −136 Oe to −11.4 Oe at 500–800°C, and the gel decreased in the range −95 Oe to −44 Oe at 600–800°C. Therefore, the deviation of the annealing temperature of the nanopowder fabricated in the sol process and the gel process was about 100°C.

STUDIES ON GENERATION AND CHARACTERIZATION OF NANOALUMINA POWDER USING WIRE EXPLOSION TECHNIQUE

2004 ◽  
Vol 03 (06) ◽  
pp. 819-827 ◽  
Author(s):  
R. SARATHI ◽  
S. R. CHAKRAVARTHY ◽  
C. VENKATASESHAIAH
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
Digital Camera ◽  
Thermal Characteristics ◽  
Wire Explosion ◽  
X Ray ◽  
Explosion Process ◽  
Transmission Electron ◽  
Nanosize Powder ◽  
The Fourier Transform

The nanoalumina particles were produced by the wire explosion process. The size and the shape of the particles were measured using Transmission Electron Microscope (TEM) studies. The Scanning Electron Microscope (SEM) studies were carried out to confirm that the particles are of sub-micron size. The compositions of the material were characterized through the Energy Dispersive Angle X-ray Analysis (EDAX) results. The Wide Angle X-ray Diffraction (WAXD) and the Fourier Transform Infra-Red (FTIR) results confirmed the nanosize powder formed by the process as crystalline γ- Al 2 O 3 powder. The thermal characteristics were analyzed using Thermo-gravimetric Differential thermal analysis (TG-DTA). It is identified that the local temperature of the medium at the time of formation of nanopowder decides the phase characteristics of the powder material. The formation mechanism of nanopowder by wire explosion technique was explained in detail. The mechanism of nanopowder formation and the characteristic changes that occur during the explosion process were recorded using a high-speed digital camera.

Preparation of Y3 Fe5 O12 Microsphere Using Bead-Milled Nanosize Powder for Embolization Therapy Application

2013 ◽  
Vol 96 (11) ◽  
pp. 3483-3488 ◽  
Author(s):  
Hiromichi Aono ◽  
Ryota Senba ◽  
Tadahiko Nishimori ◽  
Takashi Naohara
Keyword(s):  
Embolization Therapy ◽  
Nanosize Powder

Mechanochemical Synthesis of Nanosized Hydroxyapatite Powder and its Conversion to Dense Bodies

2011 ◽  
Vol 694 ◽  
pp. 118-122 ◽  
Author(s):  
Sharifah Adzila ◽  
Iis Sopyan ◽  
Mohd Hamdi Bin Abd Shukor ◽  
Ramesh Singh
Keyword(s):  
High Speed ◽  
Rotation Speed ◽  
High Strength ◽  
X Ray Diffraction ◽  
Nanosize Powder ◽  
Ammonium Hydrogen ◽  
Tcp Phase ◽  
Nanosized Hydroxyapatite ◽  
The Stability

In this work, nanosized hydroxyapatite (HA) powder was synthesized via mechanochemical method by a dry mixture of calcium hydroxide Ca(OH)2 and di-ammonium hydrogen phosphate (NH4)2HPO4 powders. The effect of mechanochemical process on powder properties was investigated. Three rotation speeds of 170 rpm, 270 rpm and 370 rpm were chose with 15 hours milling time respectively. Characterization of nanopowders was accomplished by Fourier transform infra red (FTIR), X-ray diffraction (XRD) and nanosizer analysis. The green compacted powders with 200 MPa isostatically pressed were prepared and sintered in atmosphere condition at various temperatures ranging from 1150oC - 1350oC. The results showed that the rotation speed affected the obtained powders where the crystallite size was found increased with rotation speed (9 – 21 nm). In contrast, the particle size distribution decreased with rotation speed (322-192 nm). The sintering process has influenced the stability of powder by yielding TCP phase at a lower sintering temperature, 1150oC. However, powder synthesized at 370 rpm has showed a significant hardness, 5.3 GPa after compacted and sintered at 1250oC with the relative density of 95%. This phenomenon is believed to be related with the nanosize powder synthesized at high speed which has contributes the high strength of the sintered bodies.

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