Assessment of micro-polarity anisotropy as a function of surfactant packing in sodium dodecyl sulphonate–hexane reverse micelles

Soft Matter ◽  
2016 ◽  
Vol 12 (1) ◽  
pp. 22-25 ◽  
Author(s):  
Xin Peng ◽  
Xing-Zhong Yuan ◽  
P. Somasundaran ◽  
Partha Patra
Keyword(s):  
Aqueous Phase ◽  
Reverse Micelle ◽  
Reverse Micelles ◽  
Sodium Dodecyl ◽  
Oil Water ◽  
Self Assembled

The micro-polarity anisotropy behaviour across the aqueous phase of a SDS (sodium dodecyl sulphonate)–hexane reverse micelle (RM) relies on the SDS packing in the oil–water interfacial self-assembled surfactant structure of the RM.

scholarly journals Improved mass spectrometric detection of acidic peptides by variations in the functional group pKa values of reverse micelle extraction agents

The Analyst ◽  
2018 ◽  
Vol 143 (6) ◽  
pp. 1434-1443 ◽  
Author(s):  
Bo Zhao ◽  
Mahalia A. C. Serrano ◽  
Meizhe Wang ◽  
Tianying Liu ◽  
Mallory R. Gordon ◽  
...  
Keyword(s):  
Functional Groups ◽  
Aqueous Phase ◽  
Isoelectric Point ◽  
Reverse Micelle ◽  
Reverse Micelles ◽  
Functional Group ◽  
Selective Extraction ◽  
Mass Spectrometric ◽  
Acidic Peptides ◽  
Reverse Micelle Extraction

Functional groups in reverse micelles maintain their aqueous phase pKa and allow selective extraction of peptides according to isoelectric point.

Biokinetic modeling for aerobic treatment of aqueous phase of oil-water emulsion

2016 ◽  
Vol 9 (4) ◽  
pp. 625-632
Author(s):  
Alireza Nazari Alavi ◽  
Mohammad Mirzai ◽  
Ali Akbar Sajadi ◽  
Hamed Hasanian
Keyword(s):  
Aqueous Phase ◽  
Aerobic Treatment ◽  
Water Emulsion ◽  
Oil Water ◽  
Biokinetic Modeling

scholarly journals Aggregation behavior of self-assembled nanoparticles made from carboxymethyl-hexanoyl chitosan and sodium dodecyl sulphate surfactant in water

2019 ◽  
Vol 278 ◽  
pp. 253-261 ◽  
Author(s):  
Andrés F.C. Rengifo ◽  
Sandra C. Santos ◽  
Vania R. de Lima ◽  
Alvaro J.P. Agudelo ◽  
Luis H.M. da Silva ◽  
...  
Keyword(s):  
Sodium Dodecyl Sulphate ◽  
Sodium Dodecyl ◽  
Aggregation Behavior ◽  
Hexanoyl Chitosan ◽  
Self Assembled

scholarly journals Reverse Micelle Liquid-Liquid Extraction of a Pharmaceutical Product

2012 ◽  
Vol 545 ◽  
pp. 240-244 ◽  
Author(s):  
Siti Hamidah Mohd-Setapar ◽  
Siti Norazimah Mohamad-Aziz ◽  
N.H. Harun ◽  
S.H. Hussin
Keyword(s):  
Aqueous Solution ◽  
Aqueous Phase ◽  
Reverse Micelle ◽  
Surfactant Concentration ◽  
Protein Extraction ◽  
Biological Activities ◽  
Extraction Process ◽  
Pharmaceutical Product ◽  
Penicillin G ◽  
Reverse Micelle Extraction

Reverse micelle extraction has received considerable attention in recent years due to its ability to selectively solubilise solutes from an aqueous phase, and in the case of biomolecules to maintain their biological activities. The apparent success of research on protein extraction from the aqueous phase using reverse micelle provides motivation to study the solubilisation of antibiotic. The objective of this study is to investigate the extraction of antibiotic (penicillin G is chosen as model antibiotic) from aqueous solution (forward extraction) and from the reverse micelle to a new aqueous solution (backward extraction). Sodium di(2-ethylhexyl)sulfosuccinate (AOT) is chosen as the surfactant and isooctane as the organic solvent. The UV-Vis spectrophotometer is used to determine the mass of penicillin G in solution after the extraction process. The extraction is expected to be influenced by the initial penicillin G concentration, the salt type and concentration in the aqueous phase, pH, and surfactant concentration. It is expected that as penicillin is an interfacially active compound that will interacts with AOT surfactant, the interfacial association will be dependent on both pH and surfactant concentration.

Improvement of monodispersity and shape symmetry of silica shell for PbS quantum dots by introducing surface silanization and adjusting reverse micelle size

2021 ◽  
Author(s):  
Kohki MUKAI ◽  
Kosuke Ikeda ◽  
Reo Hatta
Keyword(s):  
Reverse Micelle ◽  
Reverse Micelles ◽  
Silica Coating ◽  
Silica Shell ◽  
Raw Material ◽  
Shell Formation ◽  
Shell Size ◽  
Surface Control ◽  
Micelle Size ◽  
Pbs Quantum Dots

Abstract Increasing the thickness of the quantum dot silica coating layer reduces monodispersity and shape symmetry. This paper reports three effective ways to solve this problem and achieve a large silica-coated QDs, i.e., proper silanization on the QD surface, control of reverse micelle size by adjusting the amount of QD solvent, and two-step formation of silica shell. Proper substitution of ligands on the QD surface in the early stages of silica shell formation was important for uniform coating reaction. An amount of toluene as QD solvent determined the size of reverse micelles during the silica shell formation. There was an optimum combination of inverse micelle size and silica shell size to obtain silica-coated QDs with good monodispersity and high shape symmetry. We succeeded in growing the thick silica shell with expanding reverse micelle size by additionally supplying toluene with the raw material using the optimum silica-coated QDs as growth nucleus

Biosurfactants as demulsifying agents for oil recovery from oily sludge – performance evaluation

2013 ◽  
Vol 67 (12) ◽  
pp. 2875-2881 ◽  
Author(s):  
Evans M. N. Chirwa ◽  
Tshepo Mampholo ◽  
Oluwademilade Fayemiwo
Keyword(s):  
Oil Recovery ◽  
Sodium Dodecyl ◽  
Cost Effective ◽  
Solid Particles ◽  
Second Step ◽  
Oily Sludge ◽  
Waste Sludge ◽  
Complex Interactions ◽  
Oil Water ◽  
Living Organisms

The oil producing and petroleum refining industries dispose of a significant amount of oily sludge annually. The sludge typically contains a mixture of oil, water and solid particles in the form of complex slurry. The oil in the waste sludge is inextractible due to the complex composition and complex interactions in the sludge matrix. The sludge is disposed of on land or into surface water bodies thereby creating toxic conditions or depleting oxygen required by aquatic animals. In this study, a fumed silica mixture with hydrocarbons was used to facilitate stable emulsion (‘Pickering’ emulsion) of the oily sludge. The second step of controlled demulsification and separation of oil and sludge into layers was achieved using either a commercial surfactant (sodium dodecyl sulphate (SDS)) or a cost-effective biosurfactant from living organisms. The demulsification and separation of the oil layer using the commercial surfactant SDS was achieved within 4 hours after stopping mixing, which was much faster than the 10 days required to destabilise the emulsion using crude biosurfactants produced by a consortium of petrochemical tolerant bacteria. The recovery rate with bacteria could be improved by using a more purified biosurfactant without the cells.

scholarly journals One-Pot Synthesis of Photoluminescent Self-Assembled Carbon Dot Monolayer Films

2019 ◽  
Vol 2019 ◽  
pp. 1-8 ◽  
Author(s):  
Hongchong Guo ◽  
Wei Li ◽  
Gang Sun ◽  
Bo You
Keyword(s):  
Copper Acetate ◽  
Coating Films ◽  
Self Assembled Monolayer ◽  
Monolayer Films ◽  
One Pot ◽  
Carbon Dot ◽  
Phase Medium ◽  
Oil Water ◽  
Self Assembled ◽  
Oxidation System

We propose a facile and simple synthesis of photoluminescent (PL) carbon dot self-assembled monolayer films (CD-SAMFs) at oil-water interfaces. By using styrene both as the carbon source and the oil phase medium, we got our amazing CD-SAMFs under the copper acetate and hydrogen peroxide (Cu(Ac)2-H2O2) catalytic-oxidation system. Without any surface modification, the spontaneously formed CD-SAMFs exhibit ultrathin thickness (<10 nm), bright luminescence, high transparency, and hydrophobicity, which have the potential as a new alternative to be used on multifunctional coating films, anticounterfeiting, displays, sensors, and optical devices.

Use of Nano-TiO2 self-assembled flax fiber as a new initiative for immiscible oil/water separation

2020 ◽  
Vol 249 ◽  
pp. 119352 ◽  
Author(s):  
Yunqiu Liu ◽  
Gordon Huang ◽  
Chunjiang An ◽  
Xiujuan Chen ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Flax Fiber ◽  
Nano Tio2 ◽  
Water Separation ◽  
Oil Water Separation ◽  
Oil Water ◽  
Self Assembled

scholarly journals Supramolecular Electrochemical Sensor for Dopamine Detection Based on Self-Assembled Mixed Surfactants on Gold Nanoparticles Deposited Graphene Oxide

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2528 ◽  
Author(s):  
Pikaned Uppachai ◽  
Supalax Srijaranai ◽  
Suta Poosittisak ◽  
Illyas Md Isa ◽  
Siriboon Mukdasai
Keyword(s):  
Gold Nanoparticles ◽  
Graphene Oxide ◽  
Electrochemical Sensor ◽  
Electrochemical Impedance ◽  
Sodium Dodecyl ◽  
Mixed Surfactants ◽  
Serum Samples ◽  
Dopamine Detection ◽  
Self Assembled ◽  
Highly Sensitive Detection

A new supramolecular electrochemical sensor for highly sensitive detection of dopamine (DA) was fabricated based on supramolecular assemblies of mixed two surfactants, tetra-butylammonium bromide (TBABr) and sodium dodecyl sulphate (SDS), on the electrodeposition of gold nanoparticles on graphene oxide modified on glassy carbon electrode (AuNPs/GO/GCE). Self-assembled mixed surfactants (TBABr/SDS) were added into the solution to increase the sensitivity for the detection of DA. All electrodes were characterized by scanning electron microscopy (SEM), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS). The supramolecular electrochemical sensor (TBABr/SDS⋅⋅⋅AuNPs/GO/GCE) showed excellent electrocatalytic activity toward the oxidation of DA. Under the optimum conditions, the concentration of DA was obtained in the range from 0.02 µM to 1.00 µM, with a detection limit of 0.01 µM (3s/b). The results displayed that TBABr/SDS⋅⋅⋅AuNPs/GO/GCE exhibited excellent performance, good sensitivity, and reproducibility. In addition, the proposed supramolecular electrochemical sensor was successfully applied to determine DA in human serum samples with satisfactory recoveries (97.26% to 104.21%).

Sign in / Sign up

Export Citation Format

Share Document