Morphological and structural effects of NaOH added to silica
| ISSN: |
1573-4803
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| Source: |
Springer Online Journal Archives 1860-2000
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| Topics: |
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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| Notes: |
Abstract The effects of addition of NaOH (from 0.5 to 3%) upon the morphological and structural properties of a commercial silica support have been investigated in the range from 300 to 780° C: samples have been characterized by means of surface area, pore volume, pore and particle size distribution measurements, chemical and X-ray analysis, electron and optical microscopy observations. Results of various techniques were allied in showing the prevalency, at the lowest temperatures (〈600° C), of surface modifications involving chemical reaction and incipient sintering while at the highest temperatures (〉600° C) modifications entail the entire mass which undergoes a crystallization process. The singular presence of keatite, not hitherto reported for similar systems, allowed an interpretation of the crystallization process in terms of the sequence: amorphous → cristobalite → (keatite) → quartz.
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| Type of Medium: |
Electronic Resource
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| URL: |