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Apparent molar volumes and apparent molar heat capacities of aqueous solutions ofα- andβ-cyclodextrins at temperatures from 278.15 K to 393.15 K and at the pressure 0.35 MPa

✍ Scribed by M.L Origlia-Luster; T.G Call; E.M Woolley

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
609 KB
Volume
33
Category
Article
ISSN
0021-9614

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✦ Synopsis

Apparent molar heat capacities C p,φ and apparent molar volumes V φ were determined for aqueous solutions of αand β-cyclodextrins at temperatures from 278.15 K to 393.15 K and at the pressure 0.35 MPa. The molalities investigated ranged from 0.008 mol • kg -1 to 0.12 mol • kg -1 for α-cyclodextrin and from 0.004 mol • kg -1 to 0.014 mol • kg -1 for β-cyclodextrin. We used a vibrating-tube densimeter (DMA 512P, Anton PAAR, Austria) to determine the densities and volumetric properties. Heat capacities were obtained using a twin fixed-cell, power-compensation, differential-output, temperature-scanning calorimeter (NanoDSC 6100, Calorimetry Sciences Corporation, Spanish Fork, UT, USA). Equations were fit by regression to our experimental (V φ , T , m) and (C p,φ , T , m) results. Infinite dilution partial molar volumes V o 2 and heat capacities C o p,2 were obtained over the range of temperatures by extrapolation of these surfaces to m = 0.

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