scholarly journals Adsorption ofN-Dodecyl-β-alanine at the Air-Solution Interface with the Spread Monolayer of Lecithin or Dilaurin. I. Adsorption Isotherms

1981 ◽  
Vol 54 (1) ◽  
pp. 114-117
Author(s):  
Takao Tsutsui ◽  
Kazuo Tajima
Keyword(s):  
Adsorption Isotherms ◽  
Solution Interface ◽  
Spread Monolayer

Adsorption of Grape Seed Procyanidins on Macroporous Adsorbent Resin: Isotherms and Thermodynamics

2011 ◽  
Vol 396-398 ◽  
pp. 571-574 ◽  
Author(s):  
Ying Hua Song ◽  
Gui Zhi Zhang
Keyword(s):  
Solid Solution ◽  
Adsorption Isotherms ◽  
Adsorption Process ◽  
Physical Adsorption ◽  
Grape Seed ◽  
Adsorption Properties ◽  
Macroporous Resin ◽  
Solution Interface ◽  
Isotherms And Thermodynamics ◽  
Langmuir And Freundlich Equations

The adsorption properties,including the adsorption isotherms,thermodynamics,of grape seed procyanidins onto macroporous resin HZ818 are investigated.Both the Langmuir and Freundlich equations can provide a good fit to the adsorption isotherms, which indicates an endothermic and a favorable process in our study.The capacities of the adsorption increase with temperature. The negative values of ΔG and values of ΔH lower than 40 kJ/mol indicate a spontaneous physical adsorption, and the positive values of ΔS show the increased randomness at the solid/solution interface during the adsorption process.

Adsorption isotherms for thiourea at the mercury-solution interface

1980 ◽  
Vol 25 (5) ◽  
pp. 679-681 ◽  
Author(s):  
A. Batana ◽  
R.C. Rocha F° ◽  
L.A. Avaca ◽  
E.R. González
Keyword(s):  
Adsorption Isotherms ◽  
Solution Interface

Surface behaviour of tetrapropylammonium cation at the mercury/solution interface measured by use of controlled convective adsorptive accumulation

1985 ◽  
Vol 50 (11) ◽  
pp. 2525-2534 ◽  
Author(s):  
Ladislav Novotný ◽  
Ivan Smoler
Keyword(s):  
Surface Tension ◽  
Adsorption Isotherms ◽  
Adsorption Energy ◽  
Surface Coverage ◽  
Adsorption Parameters ◽  
Surface Tension Data ◽  
Solution Interface ◽  
Constant Potential ◽  
Drop Time ◽  
Constant Charge

Using drop time technique with long drop times and a controlled convection of the solution the surface tension data of Hg with tetrapropylammonium perchlorate in 0.1 mol l-1 NaClO4 in the concentration range 4 . 10-6 - 3 . 10-3 mol l-1 have been obtained. The corresponding adsorption parameters have been evaluated from the Frumkin isotherm both at constant potential E and at constant charge q. Both E and q could be chosen as an independent electrical variable. The maximum free adsorption energy amounts to approx. -36.5 kJ mol-1. The congruence of adsorption isotherms with respect to E and with respect to q was very well fulfilled for the surface coverage Θ ⪬ 0.6-0.7.

Electrosorption of vinyltriphenyl and propargyltriphenylphosphonium cations from methanolic solutions at the dropping and hanging mercury drop electrodes

1986 ◽  
Vol 64 (12) ◽  
pp. 2279-2283
Author(s):  
Anastasia Christodoulou ◽  
Anastos Anastopoulos ◽  
Demetrios Jannakoudakis
Keyword(s):  
Adsorption Isotherms ◽  
Mercury Electrode ◽  
Adsorption Parameters ◽  
Methanolic Solution ◽  
Solution Interface ◽  
Ionic Adsorption ◽  
Interfacial Behaviour

The interfacial behaviour of vinyltriphenyl and propargyltriphenylphosphonium cations at the mercury electrode – methanolic solution interface is studied by phase selective ac polarography using dropping Hg electrodes of short (≤5 s) and long [Formula: see text] drop times and the hanging Hg drop electrode.The various adsorption parameters are determined on the basis of non-ionic adsorption isotherms involving capacitance data independent as well dependent on time.

Template mediated crystal engineering

1994 ◽  
Vol 52 ◽  
pp. 480-481
Author(s):  
Brigid R. Heywood ◽  
S. Champ
Keyword(s):  
Crystal Engineering ◽  
Electrostatic Interactions ◽  
Alkyl Chain ◽  
Crystallographic Axis ◽  
Two Dimensional ◽  
Engineering Process ◽  
Solution Interface ◽  
Extensive Program ◽  
Geometric Homology ◽  
Long Alkyl Chain

Recent work on the crystallisation of inorganic crystals under compressed monomolecular surfactant films has shown that two dimensional templates can be used to promote the oriented nucleation of solids. When a suitable long alkyl chain surfactant is cast on the crystallisation media a monodispersied population of crystals forms exclusively at the monolayer/solution interface. Each crystal is aligned with a specific crystallographic axis perpendicular to the plane of the monolayer suggesting that nucleation is facilitated by recognition events between the nascent inorganic solid and the organic template.For example, monolayers of the long alkyl chain surfactant, stearic acid will promote the oriented nucleation of the calcium carbonate polymorph, calcite, on the (100) face, whereas compressed monolayers of n-eicosyl sulphate will induce calcite nucleation on the (001) face, (Figure 1 & 2). An extensive program of research has confirmed the general principle that molecular recognition events at the interface (including electrostatic interactions, geometric homology, stereochemical complementarity) can be used to promote the crystal engineering process.

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