Current Nanoscience - Volume 10, Issue 1, 2014
Volume 10, Issue 1, 2014
-
-
Effect of Micro Ti and TiO2 P-25 Nano Powder Addition on Mechanical Properties of TiO2 Nanopowders
Authors: Hyo Young Park, Rumman Md Raihanuzzaman, Han-Jin Ko, Joon-Min Park, Young-Choon Kim and Soon-Jik HongSintered bodies of TiO2nanopowders were fabricated by magnetic pulsed compaction (MPC) and subsequent 2 step sintering in this study and then, the effect of micro Ti and P-25 nano TiO2 powder addition on density, shrinkage and hardness was investigated. The optimum processing conditions in order to find the maximum density, hardness and shrinkage were found to be 0.5~0.7 GPa MPC pressure and 1450°C sinte Read More
-
-
-
Preparation and Characterization of Copper Nanoparticles via the Liquid Phase Plasma Method
Authors: Heon Lee, Sung Hoon Park, Seong-Gyu Seo, Sun-Jae Kim, Sang-Chai Kim, Young-Kwon Park and Sang-Chul JungPolycrystalline copper nanoparticles were synthesized from copper chloride dihydrate solution using the liquid phase plasma reduction method. A bipolar pulsed power supply with tungsten electrodes was used to generate discharge in the aqueous solutions. While large size of dendrite-shaped copper nanoparticles were mostly observed in the initial stage and particle size decreased with discharge time. The particles were dispe Read More
-
-
-
Separation of Heavy Rare Earth Elements with Extraction Chromatography
More LessUsed mainly in industries manufacturing secondary battery, display, LED, semiconductor, and other state-of-the-art products, rare earth elements (REEs) remain in demand and such demand has increased drastically. However, due to the lack of alternative materials and recycling technologies for REEs, many countries encounter difficulty in acquiring REEs. As part of the efforts to secure REEs, some studies have developed wet Read More
-
-
-
Low Current Resistive Switching Behavior in Semiconductor/Ferroelectric Coupling
Authors: Hongsu Park, YoungWoong Moon and DuckKyun ChoiUsing an a–InGaZnO(amorphous-IGZO) n-type semiconducting material, a vertically operating two terminal metalsemiconductor- ferroelectric-metal (MSFM) non-volatile resistive switching structure has been investigated. PZT thin film of composition Zr/Ti=10/90 was prepared by spin-coating method on the Pt/Ti/SiO2/p-Si(100) substrate, and 50 nm thick a-IGZO semiconductor thin film was deposited as a resistive layer Read More
-
-
-
Cu based Sputtering Target Materials for Solar Cell Manufactured by Cold Spray Deposition
Authors: Kee-Ahn Lee, Myung-Ju Lee, Dong-Yong Park and Hyung-Jun KimThis study attempted to manufacture Cu-In and Cu-Ga coating materials via the cold spray deposition (as a new process for sputtering target material) and to investigate the material’s applicability as a sputtering target for solar cell. To examine the microstructural and property changes made to those coating layers, purity, density, hardness, and porosity were measured. The results showed that coating layers of Cu-In an Read More
-
-
-
Comparative Study between Impact Behaviors of Composites with Aluminum Foam and Honeycomb
More LessThe need for composites has been growing in various industries because it has high mechanical properties for weight as well as superior stiffness and strength. The composites addressed in this study are multi-pore aluminum foam and honeycomb whose have excellent impact energy-absorption capability. In this study, impact tests of aluminum foam and honey core sandwich composite with porous core are conducted Read More
-
-
-
Effect of Dysprosium-Compounds Treatment on Coercivity of Nd-Fe-B Sintered Magnets
Authors: Dhani Ram Dhakal, Seok Namkung, Min-Woo Lee and Tae-Suk JangIn order to find an effective method to increase the coercivity of Nd-Fe-B magnets using less Dy quantity, an ordinaryprocessed Nd-Fe-B sintered magnet was treated with dysprosium-compound suspension in this work. After the magnets were prepared by a normal sintering process, they were cut into the size of 10 x10 x5 mm3 pieces and then dipped in 20 % DyF3 suspension and 20 % DyHx suspension, for one minute, so Read More
-
-
-
Microwave Technique: A Powerful Tool for Sintering Ceramic Materials
Authors: A. Borrell, M. D. Salvador, M. Miranda, F. L. Penaranda-Foix and J. M. Catala-CiveraMicrowave sintering has emerged in recent years as a promising technology for faster, cheaper and eco-friendlier processing of a wide variety of materials, which are regarded as significant advantages against conventional sintering procedures. The present investigation describes a technique for sintering two different ceramic materials by microwave heating: alumina-15vol.% zirconia and hydroxyapatite nanopowders. The res Read More
-
-
-
Interface Reactions of Pure Ti Thermal Plasma Spray Coated Mo-Si-B Alloys During Oxidation
More LessThe oxidation behaviors of Ti powder thermal spray coated Mo-Si-B alloys have been investigated in order to identify the underlying mechanism for the effect of precursor Ti coatings on Mo-Si-B alloys. Pure Ti powder was thermally sprayed on the two phase alloy (Mo (solid solution)+T2(Mo5SiB2)) fabricated by arc melting elemental components. The oxidation tests performed at 1100 °C show that the Ti po Read More
-
-
-
Microstructures and Mechanical Properties of CNT/AZ31 Composites Produced by Mechanical Alloying
Authors: Daehwan Kim, Bonghak Seong, Guenho Van, Inshup Ahn and Sugun LimIn this study, the mechanical properties and hot extrusion of carbon nanotubes (CNTs)-reinforced Mg (AZ31) based composite were investigated. To improve the mechanical properties of the Mg alloy AZ31, CNT /AZ31 composites were fabricated by mechanical alloying and hot extrusion process. Then, extrudates of these composites were formed using a hot-extrusion process. The conditions to prepare the extruded specimens, w Read More
-
-
-
Effects of Partial Phase Transformation on Characteristics of 9Cr Nanostructured Ferritic Alloy
Authors: Ji-Hyun Yoon, Yongbok Lee, Suk-Hoon Kang, Thak S. Byun and David T. HoelzerThe core structures of future nuclear systems require tolerance to extreme irradiation, and some critical components, for example, the fuel cladding in Sodium-cooled Fast Reactors (SFRs), have to maintain mechanical integrity to very high doses of 200 – 400 dpa at high temperatures up to 700 °C. The high Cr nanostructured ferritic alloys (NFAs) are under intense research worldwide as a candidate core material. Althoug Read More
-
-
-
Characteristic Analysis of Carburized Quenching Processes for Bevel Gear of Automobile Driving Part
By Key-Sun KimThe mechanical properties of automobile bevel gears manufactured by carburized guenching process are evaluated by using a finite elements method. The gear teeth of super, helical, and warm gears typically have constant cross sections and the same module, which results in the same frictional wear and stress. Bevel gears, however, are of a cone shape and thus the cross section of gear tooth change in the axial directi Read More
-
-
-
Characteristics of Machined Surface Layer of Cemented Carbide by Wire Electrical Discharge Machine
Authors: Woo-Gun Sim, Joon-Woo Song, Song-Jik Hong and Key-Sun KimWire cutting Electrical Discharge Machine (Wire EDM) uses the electrical discharge heat to cut the work piece with thin wire of brass or stainless steel by electrical discharge heat. The electrode and the work piece are melted and the cutting fluid between the electro and the piece is evaporated with burst. The melted material is spread in the shape of very tiny sphere chip. By the abrupt heating and cooling on the cut Read More
-
-
-
Mechanical Properties of WC-Co Alloys with Various Mixing and Milling Conditions using High Energy Ball Miller
Authors: Joon-Woo Song, Rumman Md. Raihanuzzaman and Soon-Jik HongThis study aims to understand the changes in mechanical properties when WC-7.5wt%Co and WC-12wt%Co compositions were experimented with various mixing, milling and consolidation conditions. Magnetic Pulsed Compaction (MPC) was used to consolidate WC-7.5wt% Co and WC-12wt% Co powders where high-energy ball milling with varying duration was employed for generating various powder types. Mechanically alloyed Read More
-
-
-
Characterization and Cell Performance of Al Paste with an Inorganic Binder of Bi2O3–B2O3–ZnO System in Si Solar Cells
Authors: Bit-Na Kim, Do-Hyung Kim, Hyeong-Jun Kim, Heon Lee, Hyo Sik Chang and Sung-Soo RyuIn this study, eco-friendly Pb-free Bi2O3–B2O3–ZnO glass frits were selected as an inorganic additive for the Al paste used in Si solar cells. The effect of glass chemistry on the electrical property of the Al electrode and on the cell performance was investigated. The results showed that as the molar ratio of ZnO to B2O3 increased, the glass transition temperature and softening temperature decreased because of the reduced g Read More
-
-
-
Effect of Carbon Addition on the Property of Mechanically Alloyed Ni-Y2O3
Authors: Jung-Ho Ahn, Jinsung Jang and Tae Kyu KimWe synthesized Y2O3-reinforced nickel-matrix nanocomposites by mechanical alloying of Ni-Y2O3, Ni-Y, Ni-NiO-Y and Ni- CuO-Y powders. Mechanical alloying of constituent powder mixtures resulted in a complete dissolution of yttrium or Y2O3 in nickel, forming a nickel-based solid solution. However, undesirable oxides such as NiO easily formed after a prolonged milling and subsequent sintering even in an inert gas atmosph Read More
-
-
-
In-situ Monitoring of Micro-scale PWSCC of Ni-based Alloys in a Simulated Primary Water Chemistry of a PWR using an EN-DCPD Technique
Authors: Sung-Woo Kim, Yeon-Ju Lee and Seong-Sik HwangThis work was conducted to establish an electrochemical noise (EN) measurement combined with a direct-current potential drop (DCPD) method, namely, an EN-DCPD technique, for in-situ monitoring of nano- or micro-scale crack initiation and the propagation of primary water stress corrosion cracking (PWSCC) of nickel based alloys, and to investigate its underlying mechanism. The EN signals of the potential and current were Read More
-
Volumes & issues
-
Volume 21 (2025)
-
Volume 20 (2024)
-
Volume 19 (2023)
-
Volume 18 (2022)
-
Volume 17 (2021)
-
Volume 16 (2020)
-
Volume 15 (2019)
-
Volume 14 (2018)
-
Volume 13 (2017)
-
Volume 12 (2016)
-
Volume 11 (2015)
-
Volume 10 (2014)
-
Volume 9 (2013)
-
Volume 8 (2012)
-
Volume 7 (2011)
-
Volume 6 (2010)
-
Volume 5 (2009)
-
Volume 4 (2008)
-
Volume 3 (2007)
-
Volume 2 (2006)
-
Volume 1 (2005)
Most Read This Month
Article
content/journals/cnano
Journal
10
5
false
en
