scholarly journals Incorporation of Ag Nanoparticles Into Micelles. Stability Studies of Self-Organized Nanoparticlesmicelles Structures

2016 ◽  
Vol 39 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Przemysław Siejak ◽  
Krzysztof Polewski
Keyword(s):  
Ag Nanoparticles ◽  
Biological Membrane ◽  
Sodium Dodecyl ◽  
Ammonium Bromide ◽  
Physical Parameters ◽  
Aqueous Environment ◽  
Self Organized ◽  
Sds Micelles ◽  
Triton X ◽  
Kinetics Of

Abstract In this paper we present the results of measured physical parameters of self-organized structures consisting of hydrophobic functionalized silver nanoparticles and amphiphilic molecules capable of micelles formation. Those systems may be considered as simple models for transfer of nanoparticles through the biological membrane. Three different surfactants were used: negatively charged sodium dodecyl sulphite, SDS, neutral Triton X-100 and positively charged tetredodecyltrimethyl ammonium bromide, TTABr. We have found that hydrophobic functionalized Ag nanoparticles are encapsulated in neutral Triton X-100 micelles with a diameter of 10 nm without significant change in the size of the micelles. The efficiency of encapsulation of Ag by SDS micelles is lower compared to Triron X-100 and no incorporation of Ag nanoparticles into TTABr occurs. Obtained results indicate that in aqueous environment ionic properties of molecules creating micelles and concentration ratios between components determine the efficiency and kinetics of two competitive processes association or aggregation of nanoparticles and encapsulation of Ag nanoparticles within micelles.

Mobility of DR1 Molecules Embedded in Nanostructured PMMA Films

2009 ◽  
Vol 5 ◽  
pp. 135-142
Author(s):  
Jorge A. García-Macedo ◽  
A. Franco ◽  
Guadalupe Valverde-Aguilar ◽  
M.A. Ríos-Enríquez
Keyword(s):  
Second Harmonic ◽  
Sodium Dodecyl ◽  
Orientation Distribution ◽  
Decay Rates ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Poling Field ◽  
Different Temperatures ◽  
Cetyl Trimethyl Ammonium ◽  
Kinetics Of

The kinetics of the orientation of Disperse Red 1 (DR1) molecules embedded in nanostructured Polymethylmetacrylate (PMMA) films was studied under the effect of an intense constant electric poling field. The changes in the orientation distribution of the DR1 molecules were followed by Second Harmonic Generation (SHG) measurements. The SHG signal was recorded as function of time at three different temperatures. We focused on both, the signal increases under the presence of the poling field and the signal decays without the poling field. The studied PMMA films were nanostructured by the incorporation of ionic surfactants as the Sodium Dodecyl Sulfate (SDS) and the Cetyl Trimethyl Ammonium Bromide (CTAB) during their preparation. The kinds of nanostructures obtained in the films were determined by means of X-ray diffraction (XRD) measurements. Substantial differences in signal intensity and in growth and decay rates between amorphous and nanostructured films were found.

Kinetics of metribuzin degradation by colloidal manganese dioxide in absence and presence of surfactants

2014 ◽  
Vol 68 (1) ◽  
Author(s):  
Qamruzzaman ◽  
Abu Nasar
Keyword(s):  
Sodium Dodecyl ◽  
Oxidative Degradation ◽  
Activation Parameters ◽  
Water Soluble ◽  
Ionic Surfactant ◽  
Ammonium Bromide ◽  
Pseudo First Order Reaction ◽  
First Order ◽  
Colloidal Mno2 ◽  
Kinetics Of

AbstractThe kinetics of the degradation of metribuzin by water-soluble colloidal MnO2 in acidic medium (HClO4) were studied spectrophotometrically in the absence and presence of surfactants. The experiments were performed under pseudo-first-order reaction conditions in respect of MnO2. The degradation was observed to be of the first order in respect of MnO2 while of fractional order for both metribuzin and HClO4. The rate constant for the degradation of metribuzin was observed to decrease as the concentration of MnO2 increased. The anionic surfactant, sodium dodecyl sulphate (SDS), was observed to be ineffective whereas the non-ionic surfactant, Triton X-100 (TX-100), accelerated the reaction rate. However, the cationic surfactant, cetyltrimethyl ammonium bromide (CTAB), caused flocculation with oppositely-charged colloidal MnO2; hence further study was not possible. The catalytic effect of TX-100 was discussed in the light of the available mathematical model. The kinetic data were exploited to generate the various activation parameters for the oxidative degradation of metribuzin by colloidal MnO2 in the absence as well as the presence of the non-ionic surfactant, TX-100.

Synergistic Effect of Thiourea and Surfactants on Corrosion Inhibition of Stainless Steel-410 in Presence of Sulfuric Acid

2014 ◽  
Vol 699 ◽  
pp. 186-191 ◽  
Author(s):  
Sami Ullah ◽  
Mohd Shariff Azmi ◽  
Muhammad Nadeem ◽  
Mohammad Azmi Bustam ◽  
Shaukat Ali Shahid ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Sulfuric Acid ◽  
Corrosion Rate ◽  
Corrosion Inhibition ◽  
Sodium Dodecyl ◽  
Ammonium Bromide ◽  
Inhibitor Concentration ◽  
Corrosion Rates ◽  
Inhibition Performance ◽  
Triton X

The inhibition of corrosion of stainless steel (SS)-410 in sulfuric acid using thiourea and three different surfactants, cetyle trimethyl ammonium bromide (CTAB), sodium dodecyl sulfate (SDS) and X-Triton was studied. Corrosion rates were determined by using corrosion coupons. The corrosion rate was found to be decreased with increase in inhibitor concentration. It was observed that the maximum corrosion inhibition occurred in the post micellar concentration of the surfactants. By optimizing the corrosion inhibition performance of different blends of surfactants and thiourea in 3 M H2SO4,the corrosion inhibition order was found as: Triton X-100 + thiourea > CTAB + thiourea > SDS + thiourea. The best results obtained by the addition of 200 ppm thiourea in 500 ppm of Triton X-100 in 3 M H2SO4acid solution. This blend decreased the corrosion rate of SS-410 to 657.66 mpy.

scholarly journals Partitioning of reactive yellow 86 between aqueous and micellar media studied by differential absorption spectroscopy

2017 ◽  
Vol 95 (6) ◽  
pp. 697-703 ◽  
Author(s):  
Naveed ul Haq ◽  
Muhammad Usman ◽  
Ajaz Hussain ◽  
Zahoor Hussain Farooqi ◽  
Muhammad Saeed ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Sodium Dodecyl ◽  
Reactive Dye ◽  
Systematic Investigation ◽  
Ammonium Bromide ◽  
Micellar Media ◽  
Differential Absorption ◽  
Absorption Data ◽  
Sds Micelles ◽  
Cetyltrimethyl Ammonium

The present study describes the partitioning of a reactive dye, reactive yellow 86, between aqueous and micellar media of a cationic surfactant (cetyltrimethyl ammonium bromide, CTAB), as well as an anionic surfactant (sodium dodecyl sulphate, SDS). In a systematic investigation, we have recorded the UV–vis absorption spectra of the dye as a function of surfactant’s concentration above and below the critical micelle concentration (CMC). Absorption spectra display a red shift in the case of CTAB and a hypochromic shift upon using SDS. The partition coefficient (Kx) was calculated using differential absorption data, and the value of free energy of partition (ΔGp) was calculated using this Kx value. The results revealed that the dye is solubilized in CTAB micelles to a greater extent than in SDS micelles.

Influence of ZnO Powders on the Stability of the Foams Stabilized by Surfactants

2013 ◽  
Vol 785-786 ◽  
pp. 359-364 ◽  
Author(s):  
Chen Chen ◽  
Zhi Rong Ren ◽  
Juan He ◽  
Yong Jun He
Keyword(s):  
Polyethylene Glycol ◽  
Synergistic Effect ◽  
Sodium Dodecyl ◽  
Phenyl Ether ◽  
Ammonium Bromide ◽  
Unstable System ◽  
Stabilizing Effect ◽  
Zno Powders ◽  
The Stability ◽  
Triton X

Foam is a thermodynamically unstable system, and the stability is the most important factor for the preparation and application of foams. In this paper, the effect of ZnO powders on the stability of the foams stabilized by sodium dodecyl benzene sulphonate (SDBS), hexadecyl trimethyl ammonium bromide (CTAB) and Polyethylene glycol tertoctyl phenyl ether (TritonX-100) was investigated. The results showed that ZnO powders have a synergistic effect with SDBS and CTAB. There is no synergy between ZnO powders and Triton X-100. The mechanism for the stabilizing effect of ZnO powders on the foams was discussed.

The autoxidation of unsaturated lipids in micelles. Synergism of inhibitors vitamins C and E

1983 ◽  
Vol 61 (6) ◽  
pp. 1288-1290 ◽  
Author(s):  
Lawrence Ross Coates Barclay ◽  
Steven Jeffrey Locke ◽  
Joseph Mark MacNeil
Keyword(s):  
Linoleic Acid ◽  
Methyl Linoleate ◽  
Sodium Dodecyl ◽  
Square Root ◽  
Micellar Phase ◽  
Chain Initiation ◽  
Unsaturated Lipids ◽  
Sds Micelles ◽  
Initiator Efficiency ◽  
Kinetics Of

The kinetics of thermally (30 °C) initiated autoxidations of unsaturated lipids, linoleic acid, and methyl linoleate are studied in 0.50 M sodium dodecyl sulfate (SDS) micelles. The rate of chain initiation, R1, was controlled by using known amounts of the thermal initiator, di-tert-butylhyponitrite (DBHN). The initiator efficiency, e, determined by the induction period method with x-tocopherol, was 0.30 for linoleic acid and varied (0.30 to 0.36) for methyl linoleate autoxiation as the concentration of the ester increased. The rate of autoxidation of linoleic acid follows the classical rate law since it is proportional to the substrate concentration and to the square root of chain initiation. The oxidizability of linoleic acid measured in micelles is 4.09 × 10−2 M−1/2 s−1/2. The oxidizability of methyl linoleate varied from 2.37 × 10−2 to 6.92 × 10−2 M−1/2 s−1/2 as the amount of solubilized ester increased. The latter results are indicative of pooling of the ester in the micellar phase. Additions of aqueous solutions of ascorbic acid to α-tocopherol-inhibited micellar autoxidations result in very significant extensions of the efficient inhibition period compared to that obtained with α-tocopherol alone. The mechanism of this synergism is briefly discussed.

scholarly journals A Study on Solubilization of Poorly Soluble Drugs by Cyclodextrins and Micelles: Complexation and Binding Characteristics of Sulfamethoxazole and Trimethoprim

2012 ◽  
Vol 2012 ◽  
pp. 1-12 ◽  
Author(s):  
Sinem Göktürk ◽  
Elif Çalışkan ◽  
R. Yeşim Talman ◽  
Umran Var
Keyword(s):  
Surface Tension ◽  
Complex Formation ◽  
Sodium Dodecyl ◽  
Binding Constants ◽  
Phase Solubility ◽  
Poorly Soluble Drugs ◽  
Binding Characteristics ◽  
Sds Micelles ◽  
Poorly Soluble ◽  
Triton X

The present study is focused on the characterization of solubilization of poorly soluble drugs, that is, sulfamethoxazole (SMX) and trimethoprim (TMP) by cyclodextrins (α-, β-, and γ-CDs) and anionic surfactant sodium dodecyl sulfate (SDS). The phase solubility diagrams drawn from UV spectral measurements are of theALtype and indicate an enhancement of SMX and TMP solubility in the presence of CDs. Complex formation tendency of TMP with CDs followed the order: γ-CD > β-CD > α-C. However, the complex formation constant values, for SMX-CD system yielded the different affinity and follow the order: β-CD > γ-CD > α-CD. With taking into consideration of solubilization capacity of SDS micelles, it has been found that the solubility enhancement of TMP is much higher than that of SMX in the presence of SDS micelles. The binding constants of SMX and TMP obtained from the Benesi-Hildebrand equation are also confirmed by the estimated surface properties of SDS, employing the surface tension measurements. In order to elucidate the solubilization characteristics the surface tension measurements were also performed for nonionic surfactant Triton X-100. Polarity of the microenvironment and probable location of SMX and TMP were also discussed in the presence of various organic solvents.

Fluorescence Probe Studies of Anthracene and 9-Methylanthracene in Detergent Micelles

1987 ◽  
Vol 40 (5) ◽  
pp. 851 ◽  
Author(s):  
E Blatt
Keyword(s):  
Steady State ◽  
Fluorescence Probe ◽  
Photophysical Properties ◽  
Equilibrium Constants ◽  
Sodium Dodecyl ◽  
Site Occupancy ◽  
Time Resolved ◽  
Aromatic Molecules ◽  
Sds Micelles ◽  
Triton X

The photophysical properties of anthracene and 9-methylanthracene have been investigated in a variety of solvents and the resulting information used to interpret data after incorporation of the two fluorophores into aqueous solutions comprising Triton X-100, cetyltrimethylammonium bromide (ctab) or sodium dodecyl sulfate (sds) micelles. The fluorescence probe methods used to elucidate micellar properties such as microviscosity , micropolarity, and the permeability of the micelle/water interface to aromatic molecules and ions, included steady-state polarization, time-resolved anisotropy and steady-state and lifetime quenching techniques. NN- Dimethylaniline (dma) and I-ions were shown to partition into Triton X-100 micelles with partition coefficients, Kp, of about 70 and 51, respectively. Excimer formation between dma and the two probes was not observed in Triton X-100 micelles, these results indicating high micropolarities (E ≈30) and microviscosities ; from polarization and anisotropy measurements the microviscosity was in the range 60-156 cP . In contrast, excited-state complexation was observed in ctab and sds. For anthracene in ctab, triplex formation occurred with an equilibrium constant, Kc, of 137 dm3 mol-l. Weak ground-state complexation between I- and the two probes was also observed in Triton X-100 and ctab micelles with equilibrium constants, Kc, in the range 0.36-9.6 dm3 mol-l. The importance of probe characterization is highlighted by the results in sds where multiple-site occupancy occurred.

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