Title: Suranaree Journal of Science and Technology

Title: Surface and Interface Analysis

ISO Abbreviated Title: Surf. Interface. Anal.

JCR Abbreviated Title: Surf Interface Anal

ISSN: 0142-2421

Issues/Year: 13

Language: English

Journal Country/Territory: England

Publisher: John Wiley & Sons Ltd

Publisher Address: The Atrium, Southern Gate, Chichester PO19 8SQ, W Sussex, England

Chemistry, Physical: Impact Factor 1.272, 79/113 (2008), Impact Factor 0.998, 90/121 (2009)

Walters, M.J., Pettit, C.M., Bock, F.X., Biss, D.P. and Roy, D. (1999), Capacitance of a metal/liquid interface during anion adsorption: Phase-selective measurement in the presence of D.C. voltage sweep and finite solution resistance. Surface and Interface Analysis, 27 (12), 1027-1036.

Full Text: S\Sur Int Ana27, 1027.pdf

Abstract: Anion adsorption plays a critical role in pitting corrosion of metals in aqueous media. Frequently, this adsorption occurs as a non-faradaic process, without any electron transfer across the interface. Such processes cannot be studied efficiently by using standard electrochemical methods such as linear sweep voltammetry (LSV), Phase-selective measurement of the interfacial differential capacitance is necessary in such cases. However, when accompanied by LSV, even these latter measurements can be affected severely by the uncompensated solution resistance. In this paper, we describe a relatively simple phase-selective impedance method where both the solution resistance and the differential capacitance can be measured in situ during the d.c. voltage scan of LSV, We apply this technique to study the adsorption properties of ClO₄^-, Cl^- and SCN^- on a polycrystalline Au electrode. The results indicate that this method can be standardized easily for the analysis of adsorption isotherms involving similar systems. Copyright (C) 1999 John Whey & Sons, Ltd.

Keywords: Anions, Differential Capacitance, Gold, Impedance, Isotherm, Adsorption, Single-Crystal Surfaces, Double-Layer, 2nd-Harmonic Generation, Electrode, Impedance, Behavior, Cadmium, Drop, Ions

? Payet, V., Dini, T., Brunner, S., Galtayries, A., Frateur, I. and Marcus, P. (2010), Pre-treatment of titanium surfaces by fibronectin: in situ adsorption and effect of concentration. Surface and Interface Analysis, 42 (6-7), 457-461.

Full Text: 2010\Sur Int Ana42, 457.pdf

Abstract: In this work, kinetics data on adsorption of fibronectin (Fn) on passivated Ti surfaces (Ti quartz crystals) in phosphate buffered saline (PBS) solution were obtained from in situ investigations with electrochemical quartz crystal microbalance (EQCM): from experiments performed at 15 and 60 mg l^-1 Fn solution concentrations, the maximum adsorption was reached within 30 min, and Fn adsorption seemed to be partially reversible, as about 15% of the initially adsorbed protein were removed upon PBS rinsing. The remaining amount of adsorbed Fn was around 1000 ng cm^-2 and was similar for both protein concentrations in solution. Moreover, differences in kinetics were observed between the two concentrations: the initial adsorption rate was much larger at 60 mg l^-1 than at 15 mg l^-1. Ex situ X-ray photoelectron spectroscopy (XPS) characterizations were used to examine the surface after adsorption under flow (EQCM measurements) or in static conditions: identification of the adsorbed protein and of the passivated TiO₂ layer on metallic Ti. With bulk Ti samples, an isotherm of adsorption of Fn in PBS was established on the basis of a selection of Fn solution concentrations and on the maximum time required to get a steady state, for a given concentration. The equivalent thicknesses of adsorbed Fn (d(Fn) (XPS), model of a continuous layer adsorbed on the passivated Ti samples) were estimated by XPS. At saturation, a plateau is reached corresponding to an equivalent thickness of 5.5 nm for Fn solution concentrations larger than 50 mg l^-1. Thed(Fn) (XPS) values of the experiments performed under flow are in satisfactory agreement with the values determined from static adsorption experiments. Copyright (C) 2010 John Wiley & Sons, Ltd.

Keywords: Titanium, Fibronectin, Dynamics, Isotherms, XPS, EQCM, Human Plasma Fibronectin, Flow-Cell EQCM, Protein, XPS, Dioxide, Binding, QCM, Ti

? Erdem, B., Özcan, A.S. and Özcan, A. (2010), Preparation of HDTMA-bentonite: Characterization studies and its adsorption behavior toward dibenzofuran. Surface and Interface Analysis, 42 (6-7), 1351-1356.

Full Text: 2010\Sur Int Ana42, 1351.pdf

Abstract: Bentonite is one of the most commonly used raw materials in the water treatment processes because of its low cost, easily availability and high mechanical and chemical stability. In this study, natural bentonite was modified with a large organic surfactant, which is hexadecyltrimethyl ammonium (HDTMA) bromide. The modified bentonite was called organobentonite. The surface characterization of natural bentonite and HDTMA-bentonite was examined by Fourier transform infrared (FTIR) spectroscopy, X-ray diffractometry(XRD), Brunauer-Emmett-Teller (BET) and thermogravimetric(TG) analysis. FTIRspectroscopy showed the existence of HDTMA functional groups on bentonite surface. XRD results revealed randomly lateral-monolayer arrangements of the intercalated alkylammonium cation. The BET surface area significantly decreased after the modification due to the coverage of the pores of natural bentonite. Differences in the differential thermogravimetric (DTG) peaks for natural-and HDTMA-bentonite were observed and interpreted. HDTMA-bentonite was then tested as an adsorbent for the removal of organic compounds such as dibenzofuran (DBF) from aqueous solutions. The amount of adsorption for HDTMA-bentonite was found to be around 20 times higher than that of natural bentonite in 10 mg dm^-3 DBF solution at 20ºC. The adsorption kinetics of DBF onto HDTMA-bentonite was also studied at 20, 30 and 40ºC and thermodynamic parameters were calculated. The overall adsorption process was exothermic and physical in nature. The results indicate that HDTMA-bentonite is an effective and a low-cost adsorbent for the removal of heterocyclic aromatic compounds such as DBF. Copyright (C) 2010 John Wiley & Sons, Ltd.

Keywords: Adsorbent, Adsorption, Adsorption Behavior, Adsorption Kinetics, Ammonium, Analysis, Aqueous Solutions, Aqueous-Solutions, Availability, Behavior, Bentonite, BET, BET Surface Area, Blue, Bromide, Cation, Characterization, Chemical, Cost, Coverage, Dibenzofuran, Dye, Exothermic, Fly-Ash, FTIR, Functional Groups, Kinetics, Low Cost, Low Cost Adsorbent, Low-Cost Adsorbent, Models, Modification, Modified, Natural, Organic, Organic Compounds, Organobentonite, Organoclay, Physical, Preparation, Removal, Si, Solution, Solutions, Spectroscopy, Stability, Surface, Surface Area, Surface Characterization, Surfactant, Thermodynamic, Thermodynamic Parameters, Thermodynamics, Treatment, Water, Water Treatment, X-Ray, XRD

? Mao, Q.H., Zhang, L.P., Huang, D.H., Wang, D., Huang, Y., Xu, H., Cao, H.T. and Mao, Z.P. (2011), Preparation and characterization of flame-retardant lamellar Mg(OH)₂ thin films on citric acid-treated cotton fabrics. Surface and Interface Analysis, 43 (5), 903-912.

Full Text: 2011\Sur Int Ana43, 903.pdf

Abstract: Preparation and characterization of lamellar magnesium hydroxide (Mg(OH)₂) thin films on cotton fabrics are reported in this paper. Mercerized cotton fabrics were treated with citric acid, so carboxyl groups were introduced to the surface of the fabrics. Mg(OH)₂ seeds were first adsorbed on the citric acid-treated cotton fabrics and then Mg(OH)₂ thin films grew on the fabric through secondary growth method. Kinetics and isotherm studies found that the adsorption of Mg(OH)₂ seeds on citric acid-treated cotton fabrics followed pseudo second-order kinetic model and Langmuir isotherm. This indicated that Mg(OH)₂ seeds adsorption was monolayer chemical adsorption driven by electric attraction between positively charged Mg(OH)₂ seeds and -COO- ions on the cotton fiber surface. The X-ray diffraction (XRD) and SEM characterizations of the Mg(OH)₂ thin films covered cotton fabrics found that standing flaky Mg(OH)₂ crystals formed a shell of porous but continuous network on cotton fabric surface. Owing to the Mg(OH)₂ thin film covering, the fabric had fireproof property, lower thermal conductivity and higher optical absorbance in the UV, Vis and IR regions. Copyright (C) 2010 John Wiley & Sons, Ltd.

Keywords: Adsorption, Characterization, Cotton, Dioxide, Flame Retardancy, Growth, Isotherm, Kinetic, Kinetic Model, Kinetics, Lamellar Magnesium Hydroxide, Langmuir, Langmuir Isotherm, Nanoparticles, Nanorods, Pyrolysis, Secondary Growth, Textiles

? Salgin, S. (2011), Effects of ionic environment on the interfacial interactions between alpha-amylase and polyether sulphone membranes. Surface and Interface Analysis, 43 (10), 1318-1324.

Full Text: 2011\Sur Int Ana43, 1318.pdf

Abstract: This work reports a systematic study on the effects of ionic environment on the adsorption of alpha-amylase on 30 kDa polyether sulphone (PES) membranes on the basis of interfacial interaction of PES membrane and alpha-amylase enzyme in solution. Static adsorption of alpha-amylase was investigated at the solution pH values of pH = 4.5, 5.6 and 7.0; and for the ionic strengths of 0.001, 0.01 and 0.1 M KCl. The maximum adsorption occurred at the pH value below the isoelectric point (IEP) of the enzyme, whereas the minimum adsorption occurred at the IEP (pH = 5.6) of amylase. With increasing ionic strength, the adsorbed enzyme on the membrane decreased. The Freundlich and Langmuir adsorption models were used for the mathematical description of the adsorption equilibrium and isotherm constants were evaluated depending on ionic environment. To determine the steps affecting the adsorption mechanism, the experimental data were evaluated using pseudo-first-order and pseudo-second-order kinetic models. The experimental data fitted well the pseudo-first-order kinetics. To detect the structural changes which occurred, membrane surfaces were analyzed by FTIR-ATR spectroscopy. The effects of ionic environment on amylase activity were also investigated. Copyright (C) 2010 John Wiley & Sons, Ltd.

Keywords: Adsorption, Adsorption Isotherm, Amylase, Biosorption, Bovine Serum-Albumin, Coefficient, Cross-Flow Ultrafiltration, Electrostatic Interaction, Equilibrium, Freundlich, Ionic Environment, Ionic Strength, Isotherm, Kinetic, Kinetic Models, Kinetics, Langmuir, Mechanism, Membrane, PES, pH, Protein Adsorption, Pseudo Second Order, Separation, Thermodynamic Parameters