scholarly journals Fabrication and characterization of porous alumina with a surface layer composed of alumina platelet by direct-foaming method

2017 ◽  
Vol 125 (4) ◽  
pp. 375-377 ◽  
Author(s):  
Akihiro SHIMAMURA ◽  
Manabu FUKUSHIMA ◽  
Mikinori HOTTA ◽  
Tatsuki OHJI ◽  
Yu-ichi YOSHIZAWA ◽  
...  
Keyword(s):  
Surface Layer ◽  
Porous Alumina ◽  
Direct Foaming ◽  
Fabrication And Characterization ◽  
Direct Foaming Method

scholarly journals Fabrication and characterization of porous alumina with denser surface layer by direct foaming

2017 ◽  
Vol 125 (1) ◽  
pp. 7-11 ◽  
Author(s):  
Akihiro SHIMAMURA ◽  
Manabu FUKUSHIMA ◽  
Mikinori HOTTA ◽  
Tatsuki OHJI ◽  
Naoki KONDO
Keyword(s):  
Surface Layer ◽  
Porous Alumina ◽  
Direct Foaming ◽  
Fabrication And Characterization

Synthesis and Characterization of MgPSZ-PMMA Composite by Sol-Gel Modification and Direct Foaming Technique Using Egg Whites

2016 ◽  
Vol 720 ◽  
pp. 290-295
Author(s):  
Veni Takarini ◽  
Alfend Rudyawan ◽  
Andri Hardiansyah ◽  
Rifki Septawendar ◽  
Niki Prastomo ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Crystal Size ◽  
Sol Gel ◽  
Porous Structures ◽  
X Ray Diffraction ◽  
X Ray ◽  
Direct Foaming ◽  
Transmission Electron ◽  
Direct Foaming Method

This study prepared Magnesium-Partially Stabilized Zirconia (Mg-PSZ) filler synthesis and direct foaming technique using egg whites, and impregnated by PMMA. The results were evaluated systematically by X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and Transmission Electron Microscope (TEM). XRD results denote that the powder sample of MgPSZ was successfully formed with various crystal size of tetragonal and monoclinic phase. SEM and TEM observations revealed that nanoparticles MgPSZ were in spherical and long rounded shapes. Furthermore, SEM observation revealed that the direct foaming method were also successful in the formation of porous structures which favourable for impregnation process by PMMA. The use of egg whites as a polymer precursor in both methods demonstrates that porous specimens contained nanosized, predominantly tetragonal, Mg-PSZ powders were successfully synthesized. This shall yield an interesting prospect towards cheap, reliable, and biocompatible product to resemble the modulus elasticity of dentin.

Fabrication and Characterization of Porous Alumina Tube with Pore Gradient

2005 ◽  
pp. 755-760 ◽  
Author(s):  
Chun Hong Chen ◽  
K. Takita ◽  
Satoshi Ishiguro ◽  
Sawao Honda ◽  
Hideo Awaji
Keyword(s):  
Porous Alumina ◽  
Alumina Tube ◽  
Fabrication And Characterization ◽  
Pore Gradient

Fabrication and Characterization of Porous Alumina-Based Ceramics Using Silicone Resin as Binder

2016 ◽  
Vol 75 (1) ◽  
pp. 40-46 ◽  
Author(s):  
Zhigang Yang ◽  
Jianbo Yu ◽  
Zhongming Ren ◽  
Chuanjun Li ◽  
Kang Deng
Keyword(s):  
Porous Alumina ◽  
Silicone Resin ◽  
Fabrication And Characterization

scholarly journals Design, fabrication and characterization of indefinite metamaterials of nanowires

2011 ◽  
Vol 369 (1950) ◽  
pp. 3434-3446 ◽  
Author(s):  
Jie Yao ◽  
Yuan Wang ◽  
Kun-Tong Tsai ◽  
Zhaowei Liu ◽  
Xiaobo Yin ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electromagnetic Waves ◽  
Large Scale ◽  
Negative Refraction ◽  
Defect Density ◽  
Porous Alumina ◽  
Broad Band ◽  
Porous Alumina Template ◽  
Fabrication And Characterization

Indefinite optical properties, which are typically characterized by hyperbolic dispersion relations, have not been observed in naturally occurring materials, but can be realized through a metamaterial approach. We present here the design, fabrication and characterization of nanowire metamaterials with indefinite permittivity, in which all-angle negative refraction of light is observed. The bottom-up fabrication technique, which applies electrochemical plating of nanowires in porous alumina template, is developed and demonstrated in achieving uniform hyperbolic optical properties at a large scale. We developed techniques to improve the uniformity and to reduce the defect density in the sample. The non-magnetic design and the off-resonance operation of the nanowire metamaterials significantly reduce the energy loss of electromagnetic waves and make the broad-band negative refraction of light possible.

Fabrication and Characterization of Gold−Polymer Nanocomposite Plasmonic Nanoarrays in a Porous Alumina Template

ACS Nano ◽  
2010 ◽  
Vol 4 (4) ◽  
pp. 2249-2255 ◽  
Author(s):  
Shobha Shukla ◽  
Kyoung-Tae Kim ◽  
A. Baev ◽  
Y. K. Yoon ◽  
N. M. Litchinitser ◽  
...  
Keyword(s):  
Porous Alumina ◽  
Polymer Nanocomposite ◽  
Alumina Template ◽  
Porous Alumina Template ◽  
Fabrication And Characterization

Porous Alumina Processing Using the Direct Foaming Technique Based on Slurry Boiling

2018 ◽  
Vol 766 ◽  
pp. 1-6
Author(s):  
Kritkaew Somton ◽  
Mana Rodchom ◽  
Pitak Laoratanakul ◽  
Ryan C. McCuiston
Keyword(s):  
Pore Size ◽  
Theoretical Calculations ◽  
Heated Surface ◽  
Porous Alumina ◽  
Bubble Diameter ◽  
Scanning Calorimetry ◽  
Direct Foaming ◽  
Solids Content ◽  
Direct Foaming Method ◽  
Size And Structure

The effect of slurry solids content was studied for a novel direct foaming method based on slurry boiling to produce porous alumina ceramics. Slurries with solids contents of 30 to 45 wt. % were produced by conventional processing methods. The physical properties of slurry density and surface tension were measured, as well as thermal properties such as specific heat and latent heat, which were obtained using differential scanning calorimetry (DSC). Samples were fabricated by boiling the slurries on a hot plate until the liquid was completely evaporated. The resultant porous samples were presintered at 1000 °C and were examined to determine the pore size and structure. The measured pore diameter of samples obtained from this experiment were compared with theoretical calculations of departing bubble diameter from a heated surface proposed by Fritz, and Cole & Rohsenow. It was found that the pore size had a relationship with slurry solids content depending on the thermal gradient. The pore size, at a position away from the heated surface, increased as the solids content increased. However, the pore size at the heated surface did not vary significantly with solids content. The results showed that a direct foaming method based on slurry boiling is capable of producing porous alumina and that solids content of the slurry may be utilized to somewhat control pore size and structure.

scholarly journals High-strength porous alumina ceramics prepared from stable wet foams

2021 ◽  
Author(s):  
Linying Wang ◽  
Liqiong An ◽  
Jin Zhao ◽  
Shunzo Shimai ◽  
Xiaojian Mao ◽  
...  
Keyword(s):  
Heat Insulation ◽  
Porous Alumina ◽  
High Strength ◽  
Porous Ceramics ◽  
High Porosity ◽  
Alumina Ceramics ◽  
Direct Foaming ◽  
Catalyst Carrier ◽  
Average Grain Size ◽  
Direct Foaming Method

AbstractPorous ceramics have been widely used in heat insulation, filtration, and as a catalyst carrier. Ceramics with high porosity and high strength are desired; however, this high porosity commonly results in low strength materials. In this study, porous alumina with high porosity and high strength was prepared by a popular direct foaming method based on particle-stabilized wet foam that used ammonium polyacrylate (PAA) and dodecyl trimethyl ammonium chloride (DTAC) as the dispersant and hydrophobic modifier, respectively. The effects of the dispersant and surfactant contents on the rheological properties of alumina slurries, stability of wet foams, and microstructure and mechanical properties of sintered ceramics were investigated. The microstructure of porous ceramics was regulated using wet foams to achieve high strength. For a given PAA content, the wet foams exhibited increasing stability with increasing DTAC content. The most stable wet foam was successfully obtained with 0.40 wt% PAA and 0.02 wt% DTAC. The corresponding porous alumina ceramics had a porosity of 82%, an average grain size of 0.7 µm, and a compressive strength of 39 MPa. However, for a given DTAC content, the wet foams had decreasing stability with increasing PAA content. A possible mechanism to explain these results is analyzed.

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