Silica Alumina Phases
Silica Alumina Phases - Related Videos
09:11
Porosimetry of a Silica Alumina Powder
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2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Surface area and pore size distribution are attributes used by adsorbent and catalyst manufacturers and users to ensure quality control and to determine when products are at the end of their useful lives. The surface area of a porous solid is directly related to its adsorption capacity or catalytic activity. The pore size distribution of an adsorbent or catalyst is...
11:06
Encapsulating Cytochrome c in Silica Aerogel Nanoarchitectures without Metal Nanoparticles while Retaining Gas-phase Bioactivity
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Cited by 1 •
2016
This procedure describes how to encapsulate cytochrome c (cyt. c) in silica (SiO2) sol-gels, process these gels to form bioaerogels, and use these bioaerogels to rapidly recognize nitric oxide (NO) through a gas-phase reaction. This type of protocol may aid in the future development of biosensors or other bioanalytical devices.
08:32
Directional Solidification and Phase Stabilization
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2023
Source: Sina Shahbazmohamadi and Peiman Shahbeigi-Roodposhti-Roodposhti, School of Engineering, University of Connecticut, Storrs, CT Directional solidification zone melting is a metallurgical process in which a narrow region of a crystal (usually in the form of bar) is melted. The furnace moves along the rod shape sample, meaning that the molten zone is moved along the crystal and the molten zone is moved from one end of the bar to the other. This mechanism is widely used in alloys, however...
07:51
Fabrication of Silica Ultra High Quality Factor Microresonators
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Cited by 22 •
2012
We describe the use of a carbon dioxide laser reflow technique to fabricate silica resonant cavities, including free-standing microspheres and on-chip microtoroids. The reflow method removes surface imperfections, allowing long photon lifetimes within both devices. The resulting devices have ultra high quality factors, enabling applications ranging from telecommunications to biodetection.
11:02
Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica
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2015
Here, we present a protocol with a sol-gel process to synthesize gold intercalated in the walls of mesoporous materials (GMS), which is confirmed to possess a mesoporous matrix with gold intercalated in the walls imparting great stability and recyclability.
FAQs
The phase assemblage is governed by composition, temperature, pressure, and thermal history. Composition sets the available silicon dioxide and aluminum oxide proportions, while temperature and pressure influence which structural forms can develop. Thermal history also matters because prior heating conditions affect subsequent transformations, making processing history essential when comparing materials produced under different conditions.
Heating can drive transformations from amorphous components toward crystalline phases, including mullite. This change reflects the development of more ordered structures within the silica–alumina system. The resulting phase formation can alter bonding, porosity, and stability, so tracking crystallization during heating helps explain how processing conditions influence the final material.
Phase transformations affect performance because they change the material’s structural arrangement and composition. In the silica–alumina system, these changes can influence bonding, porosity, and stability. Those characteristics are important when materials must provide controlled mechanical, thermal, or chemical behavior, particularly after heating or other processing conditions that promote phase development.
Researchers combine phase diagrams, diffraction methods, and thermal analysis to identify phases and follow their development. Phase diagrams relate composition and processing conditions to expected structural forms, diffraction methods examine the resulting phases, and thermal analysis tracks changes during heating. Together, these approaches connect observed transformations with the conditions that produced them.
A useful workflow begins by relating the material composition to a phase diagram, then examining how heating conditions and thermal history may alter the phase assemblage. Diffraction methods can identify developed crystalline phases, while thermal analysis monitors changes during heating. Comparing these results helps determine how processing produced the observed structure, porosity, and stability.
Control of these phases supports the design of refractories, catalysts, adsorbents, glass ceramics, and related materials. The relevant phase structure is selected or developed according to the desired mechanical, thermal, or chemical performance. In chemistry, phase analysis therefore connects composition and processing conditions with the functional behavior required for a particular material application.