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Low- and high-frequency Raman investigations on caffeine: polymorphism, disorder and phase transformation.
Raman investigations are carried out both in crystalline forms of caffeine and during the isothermal transformation of the orientationally disordered form I into the stable form II at 363 K. The timeExpand
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Ab initio structure determination of the high-temperature phase of anhydrous caffeine by X-ray powder diffraction.
The high-temperature phase I of anhydrous caffeine was obtained by heating and annealing the purified commercial form II at 450 K. This phase I can be maintained at low temperature in a metastableExpand
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  • Open Access
Ab initio structure determination of the hygroscopic anhydrous form of alpha-lactose by powder X-ray diffraction.
Annealing of alpha-lactose monohydrate at 408 K yielded a mixture of this compound with hygroscopic anhydrous alpha-lactose. A powder X-ray diffraction pattern of this mixture was recorded at roomExpand
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  • Open Access
Ab initio structure determination of phase II of racemic ibuprofen by X-ray powder diffraction.
Annealing of the quenched ibuprofen at 258 K yielded a new crystalline form, called phase II. Powder X-ray diffraction patterns of this phase II were recorded with a laboratory diffractometerExpand
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  • Open Access
Structure determination of the crystalline phase of n-butanol by powder X-ray diffraction and study of intermolecular associations by Raman spectroscopy.
X-ray powder diffraction patterns of n-butanol at 110 K and the isothermal transformation above the glass transition temperature of the supercooled liquid into the glacial state were recorded with aExpand
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  • Open Access
Polymorphic transformation of anhydrous caffeine upon grinding and hydrostatic pressurizing analyzed by low-frequency raman spectroscopy.
Low-frequency Raman investigations were carried out upon pressurizing and grinding both crystalline forms of anhydrous caffeine at room temperature. These investigations have led to the detection ofExpand
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Crystallization and polymorphism of l-arabitol
Abstract The crystallization process of l -arabitol was investigated using differential scanning calorimetry (DSC) and X-ray diffraction. In order to estimate the temperature range where the rates ofExpand
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Solid state amorphization kinetic of alpha lactose upon mechanical milling.
It has been previously reported that α-lactose could be totally amorphized by ball milling. In this paper we report a detailed investigation of the structural and microstructural changes by whichExpand
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Plastic and glassy crystal states of caffeine.
The present paper focuses on the high temperature form I of caffeine and on its low temperature metastable form. Structural, dynamic, and kinetic information has been obtained by X-ray, dielectric,Expand
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Raman spectroscopy of racemic ibuprofen: evidence of molecular disorder in phase II.
Low- and high-frequency Raman experiments in the 5-200 cm(-1) and 600-1800 cm(-1) ranges were carried out in the crystalline and amorphous states of ibuprofen. Low-frequency investigationsExpand
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  • Open Access