A simple model was proposed for the prediction of tortuosity factor of porous solids with mono or bidispersed pore size distributions. Model predictions were presented in graphical form for quick estimation of tortuosity. The experimental tortuosity factors reported in the literature for porous solids of different pore structures and the corresponding predicted values showed good agreement.


A novel synthesis of optically active alpha-amino acids
Demir, Ayhan Sıtkı (Walter de Gruyter GmbH, 1997-01-01)
A new enantioselective synthesis of alpha- amino acids are described in which the key step is the enantioselective reduction of E, and Z furyl ketone oxime ethers with chiral boron complexes. The chirality of amino acid is fully controlled by appropriate choice of geometrical isomer of the oxime ether.
The use of non-parametric tests between subsamples and particle population for the assessment of minimum number of particles in microscopic analysis
Camalan, Mahmut (Informa UK Limited, 2020-08-01)
The use of small and reliable samples in a microscopic analysis can decrease the time to estimate the particle size and mineral grade distributions in a population of particles. This paper attempts to assess the minimum reliable sample size for the above-mentioned distributions, by implementing non-parametric tests on the subsamples taken from a specific population of 2800 particles. The Kolmogorov-Smirnov tests show that the subsamples which contain more than 800 particles (29% of the population) cannot gi...
Orbey, H.; Orbey, N. (Informa UK Limited, 1989-3)
A data reduction technique is introduced for the evaluation of second virial coefficients of gases at subcritical temperatures. The method makes use of the vapor-liquid equilibrium data, i.e., temperature, saturation pressure, liquid and vapor molar volumes and can be used to obtain second virial coefficients of a wide variety of fluids including polar, associating and quantum gases. The calculated second virial coefficients are in good agreement with their counterparts from literature, which are obtained f...
Analysis of the electrofiltration mechanism based on multiphase filtration theory
Genc, A; Tosun, I (Informa UK Limited, 2004-01-01)
A mathematical model based on multiphase filtration theory is developed to describe the electrofiltration process. The model takes both electrophoretic and electroosmotic effects into account. The electrophoretic migration velocity of solid particles is predicted from the model using the filtrate volume time data obtained from electrofiltration experiments.
A Practical Guide to the Preparation of Liquid Crystal-Templated Microparticles
Wang, Xiaoguang; Büküşoğlu, Emre; Abbottt, Nicholas L. (American Chemical Society (ACS), 2017-01-10)
We provide a practical guide to methods and protocols that use polymer networks templated from droplets of liquid crystal (LC) to synthesize micrometer-sized polymeric particles that are chemically patchy, are anisometric in shape, possess anisotropic optical properties, and/or are mesoporous. We describe a range of methods that permit the preparation of LC droplets (containing reactive monomers) as templates for polymerization, including formation of LC-in-water emulsions by mechanical methods (e.g., vorte...
Citation Formats
T. Doğu, “A GRAIN MODEL FOR CATALYST TORTUOSITY,” CHEMICAL ENGINEERING COMMUNICATIONS, pp. 1–9, 1991, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/62537.