Effects of pre-adsorption on transient processes in cyclic adsorption and desorption.
نویسندگان
چکیده
منابع مشابه
Enhanced Saturation Coverages in Adsorption-Desorption Processes
Many experimental studies of protein deposition on solid surfaces involve alternating adsorption/desorption steps. In this paper, we investigate the effect of a desorption step (separating two adsorption steps) on the kinetics, the adsorbed-layer structure, and the saturation density. Our theoretical approach involves a density expansion of the pair distribution function and an application of a...
متن کاملCollective Properties of Adsorption-Desorption Processes
for the equilibrium properties is obtained. The coverage near saturation depends logarithmically on the ratio between the adsorption rate, k+, and the desorption rate, k−, ρeq ∼= 1− 1/ log(k+/k−), when k+/k− 1. A time dependent version of the reversible problem with immediate adsorption (k+ = ∞) is also considered. Both heuristic arguments and numerical simulations reveal a logarithmically slow...
متن کاملTransient Adsorption and Desorption in Micrometer Scale Features
We present a Boltzmann equation-based model for transport and reaction in micrometer-scale features such as those found in integrated circuit fabrication. We focus on the adsorption and desorption of one species to understand the transient responses to step changes at the reactor scale. The transport model has no adjustable parameters; the assumptions are detailed. Adsorption and desorption rea...
متن کاملOptimization of the monolayer growth in adsorption-desorption processes.
Kinetics of the deposition process of dimers in the presence of desorption is studied by Monte Carlo method on a one-dimensional lattice. The aim of this work is to investigate how do various temporal dependencies of the desorption rate hasten or slow down the deposition process. The growth of the coverage θ(t) above the jamming limit to its steady-state value θ(∞) is analyzed when the desorpti...
متن کاملAdsorption and Desorption of Paraquat
The adsorption and desorption of paraquat (1, l'-dimethyl-4,4'-dipyridylium dichloride) in two tropical soils was determined under laboratory conditions. The two soils were taken from rice fields located in the North West of Perak state. The adsorption equilibrium time was 2 hours for both soil types. This adsorption equilibrium time was used to determine the effect of concentration on adsorpti...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
سال: 1983
ISSN: 0021-9592,1881-1299
DOI: 10.1252/jcej.16.330