In-Situ Atomic Force Microscope Imaging of Calcite Etch Pit Morphology Changes in Undersaturated and 1-Hydroxyethylidene-1,1-diphosphonic Acid Poisoned Solutions

Abstract

Morphology changes in etch pits formed on the (1014) cleavage plane of calcite were induced by varying the ratio of [Ca 2+ ] to [CO 3 2− ] in the bulk solution as well as through the addition of the crystal poison 1-hydroxyethylidene-1,1-diphosphonic acid (HEDP). Three distinct morphologies were noted: symmetric rhombic, asymmetric rhombic, and triangular with a rough curved hypotenuse. The latter represents a transient morphology which is only observed during the actual dissolution process, while the former morphologies persist after dissolution is halted.

Microscopic and spectroscopic investigation of the calcite surface interacted with Hg(II) in aqueous solutions

“…Hillner et al, 1992;Stipp et al, 1994;Liang et al, 1996;Liang and Baer, 1997;Lea et al, 2001;De Giudici 2002) and in the presence of various organic molecules (e.g. Britt and Hlady, 1997;Hong et al, 1997;Teng and Dove, 1997;Teng et al, 1998;Orme et al, 2001 (Davis et al, 2000;Astilleros et al, 2000;Shiraki et al, 2000;Lea et al, 2001;Astilleros et al, 2002;Kamiya et al, 2002;Astilleros et al, 2003;Stipp et al, 2003;Lea et al, 2003;Hay et al, 2003;Godelitsas et al, 2003). While in situ AFM mainly shows the topographic effects of dissolution and growth processes, quantitative information on the subsequent sorption processes can be obtained using surface spectroscopic techniques such as X-ray Photoelectron Spectroscopy (XPS) and Rutherford Backscattering Spectroscopy (RBS) in combination (e.g.…”

Dissolution and growth of calcite in flowing water: estimation of back reaction rates via kinetic Monte Carlo simulations

“…Refs. [4,6]. In these studies, the crystal is primarily in a dissolution mode, but the adsorption of impurities at steps and kink sites alters or perturbs the overall dissolution.…”

“…The crystallography of calcite has been described in several recent publications [1][2][3][4][5][6]. The hexagonal shape of the unit cell is responsible for the rhombic shape of the shallow surface pits that are of interest in the present paper.…”

“…Because of its role in determining the global CO 2 balance, calcite is also environmentally important [1]. Its dissolution kinetics in water occur on a convenient time scale for laboratory study, which has encouraged a number of recent experimental investigations [2][3][4][5][6][7]. These references contain brief reviews of experimental methods and results.…”

Growth Rate and Morphology of a Single Calcium Carbonate Crystal on Polysulfone Film Measured with Time Lapse Raman Micro Spectroscopy

“…These studies have revealed a dependence of growth kinetics upon parameters such as pH, supersaturation ratio, ionic strength or temperature [2][3][4]. Atomic Force Microscopy (AFM) has been extensively used to study mechanisms and growth rates of single crystals from solution [5][6][7], including calcite crystals [1,[8][9][10][11][12][13][14]. The high resolution of AFM can visualize monomolecular steps on atomically flat crystal surfaces.…”