Adsorption of Yukawa fluids on a hard wall

We construct a closure theory for the bridge functional based on the third-order Ornstein–Zernike (OZ3) equation. The new closure is tested on the adsorption of the hard-core Yukawa fluid on a planar hard wall and its results are compared with Monte Carlo computer simulation. We show that in the particularly challenging cases of depletive adsorption, the density profiles near the wall obtained from the OZ3 theory improve considerably over conventional liquid-state theories, such as the hypernetted-chain and the Percus–Yevick equations. Some technical details of the implementation of the procedure of re-normalisation of the non-uniform indirect correlation function are also provided.

Brief Background Adsorption was not a major research field in Taiwan in the 80 th or early 90 th. Only a handful of research groups were interested in it. Professors J. R. Ma and T. C. Huang of National Cheng-Kung University were among the few that actively involved in the field, in addition to Prof. S. Y. Huang in National Taiwan University, whose main concern was on bio-related separation. We in National Central University started works on adsorption in the late 80 th and particularly on pressure swing adsorption processes. However, as the above-mentioned respectful leaders retired, and the recent domain shift of Chemical Engineering, which is indicated by the change of our department name to Chemical & Material Engineering, the research directions in Taiwan have change drastically. Another event that has a profound effect to the academic environment in Taiwan is the quick exploration of the number of institutes that occurred in the late 90 th. Effectively, we have expanded from about 20 national and private research universities to over a hundred universities and institutes. Many technical institute, whose main function was teaching and training of technical stuffs, have been "promoted" to research institute. With a quantum jump of the number of faculties who are pushed to do research, and the shrink and dilution of available resources, we see an appreciable increases in the number of research publications, with much less advances in the technology.

2019

K~ S<lt<tlYlcT T.nwy Auocrop< MOF•S QoB1C ln Ihls plp<\'. ... pm<nl "'" Idsorptloo daca of IWO l<mOty mile ...... (l1r NrCo, Ind H,.Q4•co,) on MOF•5 and CuBTC, obuolntd vi • • r<circuilling voIumdri< method. The me.uu .... enlS ..... p<tfotmed aJona constant composition and constant pressun doD\Ains. The constant pressure data out1ines the: exiJtenoe of one-componem ouotrope.lik. crosso .. n in Ihe.dsorbecI phase diagnms. Such _ropk behavloun ... r<Ia.ed ' 0 "' " deviation bt.-n selectivill<s ln "'" ttmary and "'" tqulvaknt bùwy mllltu .... Fur1IIt""""'. "'" c.pabUiIl<s of th~ modtls. Exttncled Langmuir, Elc •• nd<d TOIh .nd Ideal Adsorption Solution 11Ieory (1AS11. • 0 predkt "'" temary mixture adsorption from pu~ponenl data Ire dik'US:.Sed.

Journal of chemical …, 2005

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2021

Adsorption is a phenomenon that describes the interaction between two different phases that forms an interface layer by transfer of a molecule from a fluid bulk (liquid or gas) to a solid surface so, it is classified as a surface process. This layer is expressed by two kinds of interaction physical or chemical interactions. This process usually is reversible, and the reverse process is called desorption. In this review, the definition and types of the adsorption process will be defined. In addition to a brief explanation about the major adsorption isotherm models, adsorption kinetics, and adsorption thermodynamic

1994

This report was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof.

The adsorption ability of Iraqi initiated calcined granulated montmorillonite to adsorb Symmetrical Schiff Base Ligand 4,4'-[hydrazine-1, 2-diylidenebis (methan-1-yl-1-ylidene)) bis (2methoxyphenol)] derived from condensation reaction of hydrazine hydrate and 4-hydroxy-3methoxybenzaldehyde, from aqueous solutions has been investigated through columnar method.The ligand (H 2 L) adsorption found to be dependent on adsorbent dosage, initial concentration and contact time.All columnar experiments were carried out at three different pH values (5.5, 7and 8) using buffer solutions at flow rate of (3 drops/ min.),at room temperature (25±2)°C. The experimental isotherm data were analyzed using Langmuir, Freundlich and Temkin equations. The monolayer adsorption capacity is 5.7347 mg ligand (L) per 1g calcined Montmorillonite. The experiments showed that highest removal rate 75.70 % for ligand (L) at pH 7.The kinetic data for the adsorption process obeyed pseudo-second-order rate equations.

Data Suzukl. Motoyukl. 1941-Adsorptton englneerlng / Motoyukl Suzukl. p. cn. --(Chemical englneerlng monographs : vol. 25) Includes bibllographical references ISBN 0-444-98802-5 (U.S.) 1. Adsorptlon. I. Tttle. 11. Series Chemical englneerlng nonographs : v . 25. TP156.A35S89 1989 660'.28423--dc20 89-23532 CIP ISBN 0-444-98802-5 (Vol. 25) ISBN 0-444-41 295-6 (Series) ISBN 4-06-201 485-8 (Japan)

The analytical study determined that the productiontechnology of dry fats for food having foam and emulsion structure is to develop towards new approach allowing their absorption by spraying a fat mixture and transforming it into powdered filler. To justify the technology of obtaining dry fats for foamed desserts manufactures with the use of surfactants, we need to determine the rational contents of the main ingredients. The purpose of these studies is to examine the influence of sodium caseinate and surfactants on the process of the interfacial adsorption layers formation. We found how surfactants impact interfacial adsorption layers and marginal interfacial shear strength on the edge of the oil and air. It allows the study of processes occurring during recovery of dry fats and foam and emulsion system. We studies the impact of the sodium caseinate and surfactants on the marginal interfacial shear strength being on the edge of the oil and air at the temperature t = 20 ± 1 and 60 ± 1ºC. It has been found that the use of surfactants E471 provides systems with high interfacial shear strength on the edge of the oil and air at all analyzed The application of surfactants E322 provides a system with high interfacial shear strength onthe edge of the oil at both high and low temperatures, which allows us to obtain a stable emulsion in the first stage of the restoration of dry fat. Note that in case of properly selected surfactant mixture, while weakening interfacial adsorption layers at the water/oil interface, interfacial shear strengthof adsorption layers at the water/air interface increases. Keywords:dry fat, foam structure, emulsion structure, absorption, powdered filler, ingredient, food.

Journal of Pollution Effects &amp; Control, 2015

At first, the KASRA model and KASRA equation are discussed [1-3]. KASRA is an abbreviation for "Kinetics of Adsorption Study in the Regions with Constant Adsorption Acceleration". The KASRA model was presented by Samiey [1] in 2013 and is based on the following assumptions: (1) each time range with constant adsorption acceleration, is named a "region", (2) there are two regions before attaining plateau region, (3) the boundaries between the first and second regions and the second and third (plateau) regions are named "starting second region" (abbreviated as ssr) and "kinetics of adsorption termination" (abbreviated as kat) points, respectively and are determined by the KASRA equation, (Figures 1-4). Due to different features of the first and second regions, parameters obtained from a kinetic equation (such as the pore-diffusion, Avrami and Elovich equations, etc.) for these two regions are different from each other and the related equations for these regions come different pathways to the point q t =0 at t=0 (or q 01 according to the KASRA model). It is good to say that KASRA is a Persian word meaning king.