Structural study of highly porous nanocomposite aerogels

2007 ◽  
Vol 353 (18-21) ◽  
pp. 1785-1788 ◽  
Author(s):  
Daniela Carta ◽  
Anna Corrias ◽  
Gavin Mountjoy ◽  
Gabriele Navarra
Keyword(s):  
Structural Study ◽  
Porous Nanocomposite ◽  
Highly Porous

Structural and thermal study of highly porous nanocomposite SiO2-based aerogels

2010 ◽  
Vol 356 (18-19) ◽  
pp. 879-883 ◽  
Author(s):  
Hexin Zhang ◽  
Yingjie Qiao ◽  
Xiaohong Zhang ◽  
Shuangquan Fang
Keyword(s):  
Thermal Study ◽  
Porous Nanocomposite ◽  
Highly Porous

Role of Urea in the Preparation of Highly Porous Nanocomposite Aerogels

Langmuir ◽  
2007 ◽  
Vol 23 (7) ◽  
pp. 3509-3512 ◽  
Author(s):  
Maria F. Casula ◽  
Danilo Loche ◽  
Sergio Marras ◽  
Giorgio Paschina ◽  
Anna Corrias
Keyword(s):  
Porous Nanocomposite ◽  
Highly Porous

A highly porous nanocomposite (Fe3O4@BFR) for the removal of toxic Cd(II) ions from aqueous environment: Adsorption modelling and regeneration study

2019 ◽  
Vol 172 ◽  
pp. 179-185 ◽  
Author(s):  
Mu. Naushad ◽  
Tansir Ahamad ◽  
Khalid A. Al-Ghanim ◽  
Ala'a H. Al-Muhtaseb ◽  
Gaber E. Eldesoky ◽  
...  
Keyword(s):  
Aqueous Environment ◽  
Porous Nanocomposite ◽  
Regeneration Study ◽  
Highly Porous ◽  
Adsorption Modelling

An Ultra-Structural Study of Human Melanoma in Vivo and Vitro

1976 ◽  
Vol 34 ◽  
pp. 258-259
Author(s):  
James R. Gaylor ◽  
Fredda Schafer ◽  
Robert E. Nordquist
Keyword(s):  
Endoplasmic Reticulum ◽  
Golgi Apparatus ◽  
Protein Aggregation ◽  
Structural Study ◽  
Human Melanoma ◽  
Protein Matrix ◽  
Early Form ◽  
Endoplasmic Reticulum Protein ◽  
Mitochondrial Origin

Several theories on the origin of the melanosome exist. These include the Golgi origin theory, in which a tyrosinase-rich protein is "packaged" by the Golgi apparatus, thus forming the early form of the melanosome. A second theory postulates a mitochondrial origin of melanosomes. Its author contends that the melanosome is a modified mitochondria which acquires melanin during its development. A third theory states that a pre-melanosome is formed in the smooth or rough endoplasmic reticulum. Protein aggregation is suggested by one author as a possible source of the melanosome. This fourth theory postulates that the melanosome originates when the protein products of several genetic loci aggregate in the cytoplasm of the melanocyte. It is this protein matrix on which the melanin is deposited. It was with these theories in mind that this project was undertaken.

Use of fractals to describe microstructures of porous thick-film platinum electrodes

1992 ◽  
Vol 50 (1) ◽  
pp. 314-315
Author(s):  
Steven D. Toteda
Keyword(s):  
Fractal Dimension ◽  
Power Plants ◽  
Electrical Response ◽  
Cubic Phase ◽  
Platinum Electrodes ◽  
Fine Grained ◽  
Impedance Response ◽  
Platinum Particles ◽  
Energy Surfaces ◽  
Highly Porous

Zirconia oxygen sensors, in such applications as power plants and automobiles, generally utilize platinum electrodes for the catalytic reaction of dissociating O2 at the surface. The microstructure of the platinum electrode defines the resulting electrical response. The electrode must be porous enough to allow the oxygen to reach the zirconia surface while still remaining electrically continuous. At low sintering temperatures, the platinum is highly porous and fine grained. The platinum particles sinter together as the firing temperatures are increased. As the sintering temperatures are raised even further, the surface of the platinum begins to facet with lower energy surfaces. These microstructural changes can be seen in Figures 1 and 2, but the goal of the work is to characterize the microstructure by its fractal dimension and then relate the fractal dimension to the electrical response. The sensors were fabricated from zirconia powder stabilized in the cubic phase with 8 mol% percent yttria. Each substrate was sintered for 14 hours at 1200°C. The resulting zirconia pellets, 13mm in diameter and 2mm in thickness, were roughly 97 to 98 percent of theoretical density. The Engelhard #6082 platinum paste was applied to the zirconia disks after they were mechanically polished ( diamond). The electrodes were then sintered at temperatures ranging from 600°C to 1000°C. Each sensor was tested to determine the impedance response from 1Hz to 5,000Hz. These frequencies correspond to the electrode at the test temperature of 600°C.

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