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- W2172014692 abstract "Inverse gas chromatography (IGC) has been successfully used to characterise the nature of the surface of samples of dl-propranolol hydrochloride which have been produced under conditions of increasing milling intensity. It has been shown that the surface becomes increasingly more energetic as indicated by an increase in the dispersive component of the surface free energy and more electron donating as indicated by the adsorption of tetrahydrofuran and dichloromethane. Both effects increase until at a critical particle size a plateau is reached with no further change with a reduction in particle size. The critical particle size coincides with the brittle ductile transition determined previously by mechanical measurement. Molecular modelling was used to predict which surfaces would predominate by making use of calculations of attachment energies. The face which had the lowest attachment was postulated to be the plane which predominately fractures during high intensity milling. Visualisation showed that the π-electron rich naphthalene moiety of dl-propranolol hydrochloride dominated this surface supporting the data from IGC." @default.
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- W2172014692 date "1998-11-01" @default.
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- W2172014692 title "Characterisation of the surface energetics of milled dl-propranolol hydrochloride using inverse gas chromatography and molecular modelling" @default.
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- W2172014692 doi "https://doi.org/10.1016/s0378-5173(98)00247-6" @default.
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