Nucleation studies and crystal growth of (NH 4)H 2PO 4 doped with thiourea in supersaturated aqueous solutions
ABSTRACT The metastable zone width studies were carried out for various temperatures for supersaturated aqueous solutions of ammonium dihydrogen orthophosphate added with 1mol% of thiourea. The metastable zone width is increased with the addition of thiourea. The induction period was studied and various critical nucleation parameters were calculated based on the classical theory for homogeneous crystal nucleation. The induction period is increased with the increase of thiourea addition. The critical nucleation parameters vary with increase in doping concentration. The results are reported and discussed. The crystals were grown for various doping concentrations of thiourea and the morphological changes are discussed.
- [Show abstract] [Hide abstract]
ABSTRACT: A systematic investigation was carried out to determine the metastable zone width (MSZW) and induction period values of cytidine 5′-monophosphate disodium salt (5′-CMPNa2) in an ethanol + water mixture solution. Experimental determination of the MSZW was performed using a laser method. The two factors solution temperature and agitation were evaluated in this study to measure the MSZW. It was observed that the MSZWs decreased when the agitation levels increased and were little affected by solution temperature. The induction period was combined with the classical theory of nucleation. The various critical nucleation parameters, such as the interfacial tension (γ), the radius of critical nucleus (r*), the critical free energy of nucleus (ΔG*) and the molecular number of critical nucleus (i*) were evaluated in the controlled nucleation condition. The critical nucleation parameters varied with increased temperature, and the nucleation rate increased with increased supersaturation.Journal of Chemical & Engineering Data 04/2013; 58(5):1244–1248. · 2.05 Impact Factor
- Materials Chemistry and Physics 04/2014; 144(3):293–300. · 2.13 Impact Factor
- Optik - International Journal for Light and Electron Optics 06/2014; 125(11):2531-2537. · 0.77 Impact Factor