Interplay between aggregation number, micelle charge and hydration of catanionic surfactants

2020 ◽  
Vol 22 (18) ◽  
pp. 9998-10009 ◽  
Author(s):  
Žiga Medoš ◽  
Sergej Friesen ◽  
Richard Buchner ◽  
Marija Bešter-Rogač
Keyword(s):  
Aqueous Solution ◽  
Zeta Potential ◽  
Aggregation Number ◽  
Alkyl Chains ◽  
Catanionic Surfactants ◽  
Micelle Charge

Alkyltrimethylammonium alkanecarboxylates, [CxMe3N]+[Cy]−, with medium to long alkyl chains on both cation and anion (x,y = 6–10), were investigated in aqueous solution by density and zeta potential measurements, ITC, and DRS.

scholarly journals 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 ◽  
2019 ◽  
Vol 24 (9) ◽  
pp. 1737 ◽  
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 %.

scholarly journals ADSORBATIVE SEPARATION OF DOXYCYCLINE FROM AQUEOUS SOLUTION WITH N,N-DIETHYL N-METHYL CHITOSAN, GUM AND POLYACRYLIC ACID BASED HYDROGELS

2021 ◽  
Vol 11 (07) ◽  
pp. 44-53
Author(s):  
Mirvari Hasanova Mirvari Hasanova
Keyword(s):  
Aqueous Solution ◽  
Ion Exchange ◽  
Zeta Potential ◽  
Polyacrylic Acid ◽  
Inorganic Materials ◽  
Biologically Active ◽  
Cross Linking ◽  
Separation And Purification ◽  
Inorganic Substances ◽  
The Cross

The separation and purification of antibiotics with sorption by ion-exchange materials, as well as their delivery in biological processes by immobilization, are now widely used in biotechnology. There are many scientific studies in the literature on the sorption of antibiotics by polymer-based sorbents and inorganic materials, as well as the study of thermodynamics and kinetics of the process. In the literature, the acquisition of biologically active systems from the sorption of antibiotics by ion-exchange fibers based on various polymers and inorganic substances was carried out. However, the synthesis of selective gels for the effective separation of doxycycline and its delivery in different pH mediums by sorption with biodegradable, biocompatible polysaccharide-containing composites is one of the topical issues. Gel was synthesized from the cross-linking of N,N-diethyl N-methyl derivative of a natural polyaminosaccharide of chitosan by glutaric aldehyde. Also, pH-sensitive hydrogels that can swollen in water were synthesized from the cross-linking of a graft copolymer of cherry source gummiarabic with N-vinylpyrrolidone, as well as synthetic polymer polyacrylic acid with N,N-methylene-bis-acrylamide. The structure of the gels were identified by FTIR and NMR spectroscopy, and the sorption of doxycycline antibiotic from an aqueous solution was investigated. According to the values of zeta potential, the protonation of functional groups in the main macromolecule in an acidic medium leads to a value of zeta potential of 40÷80 mV on the surface of chitosan-based gel and others. Although the chemical structure is different, the isoelectric point is set around pH=6÷8 for all three hydrogels. The dependences of the sorption process on the amount of gels, antibiotic concentration, temperature, and pH medium were studied. The experimental data were analyzed using two adsorption models, Langmuir and Freundlich, with the later system providing the best fit. Doxycycline is adsorbed on the surface of chitosan, gummiarabic and polyacrylic acid based hydrogel composite through by physical interactions. Also, the results of thermodynamic parameters ΔG40 kJ/mol show that the nature of the adsorption process is physical, and spontaneous, too. Keywords: Chitosan, Gummiarabic-arabinogalactane, polyacrylic acid, hydrogel, sorption isoterms, doxycycline, thermodynamica.

Photocatalytic Cr(VI) Reduction by Anodized TiO2

2008 ◽  
Vol 569 ◽  
pp. 221-224 ◽  
Author(s):  
Jae Kyung Yoon ◽  
Eun Jung Shim ◽  
Jin Wook Ha ◽  
Hyun Ku Joo
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Production ◽  
Zeta Potential ◽  
Environmental Remediation ◽  
Annealing Temperature ◽  
Experimental Conditions ◽  
Novel Technique ◽  
Reduction Efficiency ◽  
Lower Annealing Temperature ◽  
Acidic Conditions

In this study, immobilized nanotubular TiO2 is used to reduce toxic Cr(VI) to non toxic Cr(III) in aqueous solution under UV irradiation. To overcome the limitation of powder TiO2, a novel technique of immobilization based on anodization was applied and investigated under various experimental conditions. Among the samples tested under same anodizing condition, the nanotubular TiO2 annealed at 450 oC and 550 oC showed higher reduction efficiencies of Cr(VI). In addition, the surface characterizations (zeta potential, XRD and SEM) of these samples proved that the Cr(VI) reduction efficiency was higher under acidic conditions and at a lower annealing temperature. Through this study, it was concluded that anodized TiO2 has the potential to be useful technology for environmental remediation as well as hydrogen production in water.

Zeta potential-assisted sorption of uranyl tricarbonate complex from aqueous solution by polyamidoxime-functionalized colloidal particles

2016 ◽  
Vol 18 (18) ◽  
pp. 13026-13032 ◽  
Author(s):  
Lixia Zhang ◽  
Li Huang ◽  
Zehua Zeng ◽  
Jun Qian ◽  
Daoben Hua
Keyword(s):  
Aqueous Solution ◽  
Zeta Potential ◽  
Colloidal Particles ◽  
New Method

A new method has been developed for effective uranium(vi) capture from an aqueous solution through zeta potential-assisted sorption.

Kinetics of Nitrites Adsorption on AB2 Type Hyperbranched Poly(Amine Ester) Modified by Trichloroctadecylsilan

2012 ◽  
Vol 446-449 ◽  
pp. 537-541
Author(s):  
Li Bin Bai ◽  
Ye Na An ◽  
Ai Qing Wang ◽  
Hai Song Zhang ◽  
Xin Xin Pan ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Freundlich Isotherm ◽  
Kinetic Mechanism ◽  
Hydroxyl Groups ◽  
Order Kinetic ◽  
Isotherm Equation ◽  
Alkyl Chains ◽  
Hyperbranched Poly ◽  
End Capping ◽  
Kinetics Of

The AB2 type hyperbranched poly(amine ester) (HBPAE) can be used as adsorbent to adsorb nitrite from aqueous solution due to a large number of terminal hydroxyl groups, where the hydrogen-bonds could formed between OH and NO2-. However, the hydrophilic properties of HBPAE limited their utility in the application because of the difficulties in removing adsorbent from nitrite solution after the adsorption was finished. The hydrophilic properties of the HBPAE were changed by means of end capping method, where the trichloroctadecylsilan (OTS) was adopted as the hydrophobic alkyl chains. The modified HBPAE by OTS can be separated from the aqueous solution. The adsorption kinetics of nitrite from aqueous solutions onto modified HBPAE was investigated to show the pseudo-first-order kinetic mechanism. The equilibrium adsorption data were found to be well fitted by Freundlich isotherm equation.

Fabrication and Stability of CoAl2O4 Ceramic Pigment for 3D Printing

2017 ◽  
Vol 898 ◽  
pp. 1935-1939 ◽  
Author(s):  
Yuan Song ◽  
Yuan Lin Zheng ◽  
Yu Fei Tang ◽  
Hai Bing Yang
Keyword(s):  
Solid Solution ◽  
Aqueous Solution ◽  
3D Printing ◽  
Zeta Potential ◽  
Spinel Structure ◽  
Sol Gel ◽  
Ceramic Pigment ◽  
Ceramic Pigments ◽  
Oxide Solid Solution ◽  
The Stability

Ceramic pigment is the key component of the ink color in the 3D printing process of ceramic products. The color performance and stability of ceramic pigments after calcination still need to be improved. In the present study the cobalt aluminate (CoAl2O4) ceramic pigment powders were fabricated by sol-gel method. The effects of fabrication processes on color properties of CoAl2O4 ceramic pigments were investigated. The compositions and morphologies of CoAl2O4 ceramic pigment powders were characterized. The stability of CoAl2O4 ceramic pigments was discussed. The results showed that the CoAl2O4 ceramic pigment with high chroma was obtained at calcination temperature of 1200°C and the Co/Al ratio is 1:3. The Zeta potential of the fabricated CoAl2O4 ceramic pigment powders in aqueous solution was-66.2 mV, which represented good dispersion stability. The chroma and saturation of the CoAl2O4 ceramic pigment increased owing to that the oxide solid solution in the spinel structure increased after being sintered at 1300 oC.

scholarly journals Enhancement of As(v) adsorption from aqueous solution by a magnetic chitosan/biochar composite

RSC Advances ◽  
2017 ◽  
Vol 7 (18) ◽  
pp. 10891-10900 ◽  
Author(s):  
Shaobo Liu ◽  
Binyan Huang ◽  
Liyuan Chai ◽  
Yunguo Liu ◽  
Guangming Zeng ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Zeta Potential ◽  
Chemical Properties ◽  
Physical And Chemical Properties ◽  
Magnetic Chitosan ◽  
Physical And Chemical ◽  
And Chemical Properties

In this study, a magnetic chitosan/biochar composite (MCB) was prepared successfully, and characterized by SEM, TEM, VSM, XRD, FTIR, XPS, and zeta-potential to obtain its physical and chemical properties.

scholarly journals Studying the concentration dependence of the aggregation number of a micellar model system by SANS

Soft Matter ◽  
2015 ◽  
Vol 11 (21) ◽  
pp. 4208-4217 ◽  
Author(s):  
Matthias Amann ◽  
Lutz Willner ◽  
Jörg Stellbrink ◽  
Aurel Radulescu ◽  
Dieter Richter
Keyword(s):  
Aqueous Solution ◽  
Concentration Dependence ◽  
Aggregation Number ◽  
Model System ◽  
Polymer Micelles ◽  
P Concentration

Concentration dependence of the aggregation number of n-octacosanyl-PEO polymer micelles in aqueous solution determined by SANS experiments.

Sign in / Sign up

Export Citation Format

Share Document