USP – U.S. Pharmacopeial Convention

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USP – U.S. Pharmacopeial Convention for Micromeritics Clicking the links below will open a new browser window to the standard on USP.org.  USP <267> Porosimetry for Mercury Intrusion USP <429> Laser Diffraction Method of Particle Size USP <699> Density of Solids – Gas Pycnometry USP <788> Particulate Matter in Injections USP <789> Particulate Matter in Ophthalmic Solutions USP <846> Specific Surface Area…

Micromeritics Role in the Development of DFT

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In April 1993, Micromeritics introduced a software package called DFT V1.00. This program was the first commercial offering of a practical method to routinely analyze experimental adsorption isotherms using methods based on modern theoretical physical chemistry. It was the culmination of an investigation by James P. Olivier and William B. Conklin into a method by…

NLDFT / DFT Bibliography

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DFT / NLDFT Bibliography Title Author Publication A model of the physical adsorption isotherm. Paul A. Webb, J. P. Olivier and W. B. Conklin American Laboratory 26, 38 (1994). A New Analysis Method for the Determination of the Pore Size Distribution of Porous Carbons from Nitrogen Adsorption Measurements Seaton, Walton and Quirke Carbon, Vol. 27, No.…

NLDFT Time Line

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1980’s 1990’s 2000’s Fundamental research into fluid behavior in non-homogeneous systems Development of DFT as a practical method for reducing isotherm data Development of DFT models that apply to a variety of adsorbent-adsorbate systems and pore shapes Theory of Condensation in Narrow Capillaries / R. Evans and P. Tarazona – Phys. Rev. Lett. 52, 557…

A Brief History of Density Functional Theory

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A Brief History of Density Functional Theory Applied to Extracting Information from the Physical Adsorption Isotherm   During the 1980s, considerable progress was made toward a theoretical understanding of fluid behavior in non-homogeneous systems. Particular interest was focused on phase changes in fluids constrained by the presence of walls, capillaries, and slits. A paper that…