Zobrazeno 1 - 10
of 329
pro vyhledávání: '"R.K. Gilpin"'
Autor:
R.K. Gilpin, W. Zhou
Publikováno v:
Vibrational Spectroscopy. 37:53-59
An infrared method has been developed and used to study the thermal conversion of mefenamic acid from its polymorphic I form to the polymorphic II form. Rates of conversion for the crystal to crystal transition have been measured at temperatures of 1
Autor:
W. Zhou, R.K. Gilpin
Publikováno v:
Journal of Pharmaceutical Sciences. 93:1545-1556
A Finnigan MAT TSQ 700 triple quadrupole mass spectrometer equipped with a Harvard 22 syringe pump has been used to investigate the thermal decomposition of three common pharmaceuticals, acetaminophen, indomethacin, and mefenamic acid. In addition, c
Publikováno v:
Journal of Chromatography A. 797:103-110
The basic chromatographic properties of silica-based amide-bonded phases possessing unsubstituted or substituted aromatic rings were evaluated using retention measurements carried out for simple probe molecules such as alkylbenzenes and aromatic hydr
Publikováno v:
Thermochimica Acta. 287:225-233
Physicochemical properties of water films formed on the surfaces of porous silicas were studied by high-resolution thermogravimetry (TGA) and differential scanning calorimetry (DSC) over a temperature range from −70°C to 250°C. Silica samples wer
Publikováno v:
Thermochimica Acta. 272:65-73
Microporous active carbons of differing structural and surface properties were studied by thermogravimetry (TGA) under controlled conditions. Weight loss curves were measured for various carbon samples wetted and saturated with water, n-butanol, benz
Publikováno v:
Analytica Chimica Acta. 315:77-81
The influence of surface effects on the thermotropic and microscopic properties of the liquid crystal, 4′-cyano-4-biphenyl[4-(4-pentenyloxy)]benzoate (CBPB), have been studied by differential scanning calorimetry (DSC) and Fourier transform infrare
Publikováno v:
Journal of Chromatographic Science. 31:285-290
Publikováno v:
Carbon. 31:325-331
The fractal nature of heterogeneous microporous active carbons is studied. The microporous structures of these materials are characterized in terms of micropore-size distributions that are evaluated from benzene adsorption isotherm data. The log-log
Publikováno v:
Journal of Chromatography A. 628:59-67
A new numerical method for calculating the adsorption energy distribution function from retention volume data obtained by gas-solid adsorption chromatography is introduced. The method, which considers the ill-posed character of the problem, is applic
Publikováno v:
Analytica Chimica Acta. 269:157-165
The thermal desorption of water from five aluminum oxide samples with different porosities and specific surface areas was studied under dynamic and quasi-isothermal conditions. The thermogravimetric (TG) curves obtained show multi-step weight losses