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As calcium hydroxyl phosphate, it is the principal inorganic constituent of teeth and bones and occurs as the mineral apatite.
The result indicated that the transfer resistance for the carbon dioxide absorption was negligible during the reactive crystallization, the rate-controlling step would shift from the crystallization of calcite to the dissolution of calcium hydroxyl at a turning time θc.
According to the two-film theory and the two-steps crystal growth model, the kinetic characteristics in the system were investigated by the rate-comparison of the calcium hydroxyl dissolution, carbon dioxide absorption and calcium carbonate precipitation.
When reaction time was less than θc, the calcite crystallization could be the rate-controlling step; while reaction time was larger than θc, the calcium hydroxyl dissolution became the rate-controlling step.
HA formulations and calcium hydroxyl appetite products are newer alternatives.
One of long-lasting synthetic semi-permanent dermal fillers is calcium hydroxyl apatite based filler (CaHA) suspended in an aqueous carboxymethylcelluose gel carrier.
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Ar+ ion beam sputter deposition was used to produce thin calcium phosphate (hydroxyl poly calcium sodium phosphate, HPPA) coating on polished titanium substrate.
At present, the generally accepted mechanism for charge compensation at nonisovalent replacement CO3 2- → PO4 3- in HAP is the formation of vacancies of calcium and hydroxyl groups in neighboring lattice sites (see, e.g., [28]).
Such conditions were available in the Biodentine™ group, in which the hydrated cement was the source of calcium and hydroxyl ions, and the phosphate buffered saline was the source of the phosphate ions.
The surface adsorbed water molecules, sulfate and sodium ions, strongly associated with the calcium atoms and hydroxyl groups, form a ionic and hydrate layer, stabilizing the tri-calcium silicate surface and inhibiting the dissolution of ions in C3S.
At the beginning of the carbonation reaction, the slaked lime solution contains the calcium (Ca2+) and hydroxyl ion (OH−) (Eq. (3)) (Olajire 2013), which in turn increases the pH of the solution (12.4).
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