Growth Morphology and Segregation of Sucrose Crystals Grown from Aqueous Solutions in the Presence of Raffinose.

Sucrose crystals grown from aqueous solutions in the presence of Raffinose are elongated in the [010] direction, together with more and more simpler Morphologies, as higher is the additive concentration in the solution [Craff(sol)]. The Raffinose concentration inside the host crystal [Craff(cryst)] changes both with Craff(sol) and with the different growth sectors. The plot (Craff( cryst) vs Craff(sol)] at T = 40 °C and supersaturation 0,080 is not monoatomic , but can be approximated by two straigh lines with opposite slopes, below and above Craff(sol)= 4%, respectively, according with the strongest habit modifications. The differences between the Raffinose segregated in the complementary sectors (110) and (-1-10) reaches one order of magnitude, according with the strog different ability of surface adsorption on the corresponding faces

(100) and (111) Forms of NaCl-like Crystals Coexisting in Growth from Pure Aqueous Solution.

The Authors prove, by means of SEM, the co-existence of (100) and (111) forms in pure aqueous solution in well defined supersaturation range. The consequences of the "octopole hypothesis" is discussed. Finally, according to the calculation of the reconstructed (111) surfaces, the equilibrium shape of the crystals was determined

Face-by-face growth of sucrose crystals from aqueous solutions in the presence of raffinose;I.Experiments and Kinetics-adsorption model.

Experimental growth kinetics of the four most important flat forms of sucrose crystals has been investigated under varying raffinose concentrations within a range of low supersaturations at 313 K. Both Cabrera-Vermilyea and Kubota models, associated with Langmuir-type equilibrium isotherms are tested to find the more suitable description of the kinetics behaviour in the presence of raffinose

Morphology of Calcite (CaCO3)Crystals Growing from Aqueous Solutions in the Presence of Li+ Ions. Surface Behavior of the (0001)Form.

Single micro-crystals of zabuyelite were observed on 0001 calcite surfaces, epitaxilly grown and oriented along the direction of calcite, the (001) faces of zabuyelite being by far the the best candidate to form the epitaxial interface