Papers by Keyword: SDS

Abstract: Nanotechnology has been the prime approach over the last several decades including in scaling prevention. There has been a flurry of activity in incorporating nanoparticles (NPs) with scale inhibitors (SI) to help mitigate the scales’ growth at the early stage before it worsens. However, despite the increasing use of nanoparticles in industry, reservoir complexity such as salinity and heterogeneity have significantly impacted the nanoparticles' performance in the medium. The nanoparticles' repulsive forces are reduced when brine salinity is present, resulting in flocculation and coagulation of nanoparticles in suspension and phase separation. However, the stability and dispersion of nanoparticles may be improved by altering their characteristics by coating them with a surfactant for a particular application. This can be done by introducing a surfactant in the nanoparticle suspension. Herein, this paper aims to study the dispersion and stability of different types of NPs and their performance in Sodium Dodecyl Sulfate (SDS) surfactant solution. Results obtained proved that carbon-based NPs (graphene oxide (GO) and multi-walled carbon nanotube (MWCNT)) showed an excellent zeta potential measurement up to -116 mV when these NPs were dispersed in SDS solution. This surfactant has significantly improved the NPs stability by increasing electrostatic repulsion between the NPs while reducing the average size of agglomeration.

Abstract: The electrocoagulation/flotation (ECF) technique has been regarded as a safe, efficient and environmentally friendly technique for contaminants removal in aqueous solution. In this research, an electrocoagulation cell was constructed using aluminum metal as electrodes. The constructed electrocoagulation cells were then utilized for the removals of organic dye from model solutions. To enhance flotation, sodium dodecyl sulfate (SDS) was added as a surface active agent. Some operational parameters namely electrolysis time, applied voltage, and SDS concentration were investigated. It was found that the optimum conditions were electrolysis time of 30 minute, applied voltage of 5 V, and SDS concentration of 200 ppm. Under these optimum conditions, the removal of organic dye was 84%. It was concluded that addition of SDS to ECF system may facilitate better and efficient removals of organic dye from aqueous solutions.

Abstract: Gold nanoparticles (AuNPs) have been synthesised from adsorbed Au on hydrotalcite (Mg/Al HT-AA-Au) using SDS (sodium dodecyl sulfate) and sodium citrate as capping agent. Then, the nanoparticles were recovered into pure gold by centrifugation. It is shown that sodium citrate has better activity compared to SDS as the capping agent. The electronic spectra of the resulted AuNPs showed that the optimum pH, sodium citrate concentration and time of sonication were 5, 70 mM, and 2 h, respectively. The results showed that the average size of AuNPs was 32 nm at SPR 531 nm. By centrifugation at 13000 rpm for 8 min, gold dust of Au(0) can be obtained from the gold nanoparticles capped sodium citrate. Based on infrared spectra and XRD, it is proven that the gold dust still contains citric and Mg/Al HT.

Abstract: Besides other application of clathrate hydrates, hydrate-based CO₂ capture and storage are potentially important where additives are commonly used to speed up the hydrate formation processes in order to gain on scientific, technological and economic interest. In this work combination of additives such as tetrahydrofuran and sodium dodecyl sulphate (THF/SDS) on mixed gas hydrate formation and dissociation condition have been investigated using a graphical method. The measurements were carried out at temperature and pressure range of (265 to 300) K and (1 to 5) MPa. The presence of additive 3 mol % THF has drastically increased in the hydrate stability region while with the combination of SDS + THF lower the hydrate equilibrium temperature marginally.

Abstract: The present paper describes the results of the physicochemical and rheological characterisation of the selected self-made solutions of synthetic saliva. The substitutes of the used saliva were prepared on the basis of gums (xanthan, guar, arabic and carob bean) dissolved in saline buffer. Additionally, one of preparations were composed of xanthan gum and sodium dodecyl sulphate (SDS). The analysis of the viscosity, pH, surface tension and conductivity of the tested solutions was performed. The tests were carried out following one, three and seven days. The obtained results of the conducted studies showed differences between the tested preparations in the scope of the above evaluated quantities. The preparations based on the tested gums have similar properties in terms of pH, surface tension and conductivity. Only the substitute with the addition of xanthan gum and SDS exhibited different characteristics: the highest value of pH and the lowest values of conductivity and surface tension. In the case of viscosity, some preparations exhibited Newtonian rheological characteristics while others exhibited non-Newtonian characteristics.

Abstract: Hexadecyl trimethyl ammonium bromide (CTAB) was used as simulated substance of organic amine wastewater, the adsorption of sodium dodecyl sulfate (SDS) intercalated ZnAl-LDH and MgFe-LDH [ZnAl (SDS)-LDH and MgFe (SDS)-LDH] on it are studied. These two kinds of LDHs all have good adsorption ability on CTAB, the COD removal degree of ZnAl (SDS)-LDH and MgFe (SDS)-LDH on CTAB can be high up to 94% and 96% due to the static electric attraction and the hydrophobic interaction between the SDS and CTAB.

Abstract: Ag/PPy composites were prepared in β-naphthalene sulfonic acid (β-NSA) or sodium dodecyl sulfate (SDS) aqueous solutions with AgNO3 as oxidant. β-NSA or SDS acted as dopant and soft template in the process of preparing polypyrrole (PPy) by in situ oxidizing polymerization method. SEM, TEM, FTIR, XRD and Four-Point Probes Resistivity Measurement System were tested respectively and results indicated that the obtained Ag/PPy composites displayed different morphology,structure and conducting characteristic.

Abstract: Nano-hydroxyapatite colloid was prepared by the method of precipitation. when the colloid was dried and sintered,it always agglomerated.The CTAB and SDS were added to disperse it . The effects of surfactants on the size and phase of HA crystals were studied by TEM and XRD .The results showed that Nanometer columnar HA powders of 40nm long and 20nm wide with narrow distribution of particle size and dispersion performance can be prepared when we added CTAB aqueous solution into HA colloid,CTAB concentration is 0.3%, mol ratio between CTAB and HA is 3:10. As SDS aqueous solution was added into HA colloid, the best process is that SDS concentration is 0.6%, mol ratio between SDS and HA is 1:1. The prepared powder with wide distribution of particle size is 30-60nm long and 10-30nm wide.

Abstract: Polypyrrole (PPy) nanowires and bundles were successfully synthesized by changing the concentration of the monomer in sodium dodecyl sulfate (SDS) solution. The obtained PPy was characterized by SEM, FT-IR and XRD. The results showed that the PPy was amorphous although their morphology was different and some surfactant molecules were doped into the polymer chains as counterions.

Abstract: Surfactant-templated synthesis of ordered nanostructured materials attracts more and more attention. In this paper, ordered nanostructured Fe₃O₄ powder was synthesized via a facile reflux method in ethanol-water media using sodium dodecyl sulphonate (SDS, C₁₂H₂₅SO₃Na) as template. XRD and VSM were used to characterize the ordered nanostructure, inorganic phase and magnetic properties. Results show that Fe₃O₄ powder is of an ordered nanostructure of 7.6 nm which was detected by SAXRD and the inorganic phase is composed of cubic Fe₃O₄ nanocrystals. VSM analysis shows that the ordered nanostructured Fe₃O₄ exhibits a two-phase structure and a soft magnetic property with a saturation magnetization of 40emu/g.