Zeta Potential of Stearic Acid Monolayer at the Air–Aqueous Solution Interface

The kinetics of the liquid-like → solid-like 2D phase transition of adenine adsorbed at the Hg/aqueous solution interface is studied. Attention is focused on the effect of temperature on the rate of phase change; an increase in temperature is found to cause a decrease of transition rate.

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Periodic protein adsorption at the gold/biotin aqueous solution interface: evidence of kinetics with time delay

Scientific Reports ◽

10.1038/srep36232 ◽

2016 ◽

Vol 6 (1) ◽

Cited By ~ 3

Author(s):

H. Neff ◽

H. M. Laborde ◽

A. M. N. Lima

Keyword(s):

Aqueous Solution ◽

Time Delay ◽

Protein Adsorption ◽

Solution Interface

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Evaluation of N-Alkyl-bis-o-aminobenzamide Receptors for the Determination and Separation of Metal Ions by Fluorescence, UV-Visible Spectrometry and Zeta Potential

Molecules ◽

10.3390/molecules24091737 ◽

2019 ◽

Vol 24 (9) ◽

pp. 1737 ◽

Cited By ~ 1

Author(s):

Marisela Martinez-Quiroz ◽

Xiomara E. Aguilar-Martinez ◽

Mercedes T. Oropeza-Guzman ◽

Ricardo Valdez ◽

Eduardo A. Lopez-Maldonado

Keyword(s):

Aqueous Solution ◽

Zeta Potential ◽

Metal Ions ◽

Environmental Concern ◽

Separation Of Metal Ions ◽

Complexing Capacity ◽

Alkyl Groups ◽

Molecular Fluorescence ◽

Uv Visible ◽

Phase Sensor

This paper presents the synthesis and evaluation of physicochemical behavior of a new series of N-alkyl-bis-o-aminobenzamides (BOABs) in aqueous solution. The study was targeted to the complexing capacity of five metal ions (Fe2+, Cu2+, Cd2+, Hg2+ and Pb2+) of environmental concern as the medullar principle of a liquid phase sensor for its application in the determination of these metal ions due to its versatility of use. Molecular fluorescence, UV-visible and Zeta potential were measured for five BOABs and the effect of alkyl groups with different central chain length (n = 3, 4, 6, 8 and 10) on physicochemical performance determined. The results have shown that these derivatives present higher sensibility and selectivity for Cu2+ even in the presence of the other metal ions. An additional application test was done adding a pectin (0.1 wt %) solution to the BOAB-Cu+2 complex to obtain a precipitate (flocs) as a potential selective separation process of Cu from aqueous solution. The solid was then lyophilized and analyzed by SEM-EDS, the images showed spheric forms containing Cu+2 with diameter of approximately of 8 μm and 30 wt %.

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Adsorption of malic acid at the hydroxyapatite/aqueous NaCl solution interface

Applied Nanoscience ◽

10.1007/s13204-021-01938-w ◽

2021 ◽

Author(s):

Władysław Janusz ◽

Ewa Skwarek

Keyword(s):

Zeta Potential ◽

Malic Acid ◽

Particle Sizes ◽

Nacl Solution ◽

X Ray Diffraction ◽

Radioisotope Method ◽

X Ray ◽

Solution Interface ◽

Adsorption Desorption ◽

Kinetics Of

AbstractThe aim of the study was the basic incidence on the phenomenon of adsorption that occurs at the hydroxyapatite/malic acid interface, leading to a change in the surface properties of hydroxyapatite, Analytical methods used in the research: X-ray diffraction (XRD) as well as by the, adsorption–desorption of nitrogen (ASAP), potentiometric titration. The specific adsorption of malic acid ions at the hydroxyapatite interface was investigated by means of the radioisotope method. The zeta potential of hydroxyapatite dispersions was determined by electrophoresis with Zetasizer Nano ZS90 by Malvern. The particle sizes of hydroxyapatite samples were analyzed using Masteriszer 2000 Malvern. Studies on the kinetics of malic acid on hydroxyapatite from a solution with an initial concentration of 1 mmol/dm3 have shown that the adsorption process is initially fast, followed by a slow adsorption step. An increase in the pH of the solution causes a decrease in the malic acid adsorption as a result of competition with hydroxyl ions. The presence of adsorbed malic acid was confirmed by the FTIR measurements. The effect of malic acid adsorption on the zeta potential and particle size distribution of hydroxyapatite in the NaCl solution was investigated.

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