MORPHOLOGY SAND STRUCTURE OF CACO3 SCALE LAYERS FORMED UNDER ISOTHERMAL FLOW CONDITIONS

Citation
N. Andritsos et al., MORPHOLOGY SAND STRUCTURE OF CACO3 SCALE LAYERS FORMED UNDER ISOTHERMAL FLOW CONDITIONS, Langmuir, 13(10), 1997, pp. 2873-2879
Citations number
23
Categorie Soggetti
Chemistry Physical
Journal title
ISSN journal
07437463
Volume
13
Issue
10
Year of publication
1997
Pages
2873 - 2879
Database
ISI
SICI code
0743-7463(1997)13:10<2873:MSSOCS>2.0.ZU;2-M
Abstract
The morphology and the growth pattern of calcium carbonate deposits fo rmed on inner pipe surfaces, under turbulent flow, are studied. At tem peratures below 30 degrees C, and for relatively high supersaturations , quite compact calcite layers are obtained, consisting of crystals gr owing nearly perpendicularly to the substrate surface in a columnar pa ttern. For small supersaturations (i.e., below a critical value S-c si milar to 7), the deposition rate is drastically reduced and large isol ated crystals are formed. At temperatures above 30 degrees C, rather w eak dendritic aragonite patterns are dominant. The removal of magnesiu m from the tap water (used in the tests) results in the formation of a ll three polymorphs.