Photophysics of Water Soluble Perylene Diimides in Surfactant Solutions

2007 ◽  
Vol 111 (42) ◽  
pp. 10609-10614 ◽  
Author(s):  
Tingji Tang ◽  
Kalina Peneva ◽  
Klaus Müllen ◽  
Stephen E. Webber
Keyword(s):  
Water Soluble ◽  
Perylene Diimides ◽  
Surfactant Solutions

scholarly journals Improvement of Foaming Ability of Surfactant Solutions by Water-Soluble Polymers: Experiment and Molecular Dynamics Simulation

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 571 ◽  
Author(s):  
Chaohang Xu ◽  
Hetang Wang ◽  
Deming Wang ◽  
Xiaolong Zhu ◽  
Yunfei Zhu ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Water Soluble ◽  
Dynamics Simulation ◽  
Foaming Agents ◽  
Water Soluble Polymers ◽  
Foaming Ability ◽  
Soluble Polymers ◽  
Aqueous Foam ◽  
Surfactant Solutions ◽  
The Stability

Aqueous foam is widely used in fire extinguishing and dust suppression technologies. Improving the foaming ability is the key to reducing the added concentration of foaming agents as well as the economic cost. In this work, the effect of a water-soluble polymer (polyvinyl alcohol, PVA) on the foaming ability of anionic surfactant (sodium dodecyl ether sulfate, SDES) was studied by an experiment and molecular dynamics simulation. The experimental results showed that PVA greatly improves the foaming ability of SDES solutions when the surfactant concentration is less than 0.1%, which is attributed to the fact that the polymer can enhance the stability of bubble films and reduce the bubble rupture rate during the foam generation process. The simulation results indicate that PVA can enhance the hydration of surfactant head groups and contribute to the formation of a three-dimensional hydrogen bond network between surfactants, polymers, and water molecules, thus greatly improving the stability of bubble liquid films. The above results suggest that water-soluble polymers can be used to improve the foaming ability of surfactant solutions by enhancing the bubble film stability, which is beneficial as it reduces the added concentration of foaming agents in aqueous foam applications.

Surfactant Solutions as Media for Dissolution Testing of A Poorly Water-Soluble Drug

1985 ◽  
Vol 11 (9-10) ◽  
pp. 1797-1818 ◽  
Author(s):  
N. K. Pandit ◽  
J. M. Strykowski ◽  
E. J. McNally ◽  
A. M. Waldbillig
Keyword(s):  
Water Soluble ◽  
Dissolution Testing ◽  
Surfactant Solutions ◽  
Water Soluble Drug ◽  
Poorly Water Soluble ◽  
Poorly Water Soluble Drug

scholarly journals Energy Transfer in Molecular Layer-by-Layer Films of Water-Soluble Perylene Diimides

Langmuir ◽  
2007 ◽  
Vol 23 (8) ◽  
pp. 4623-4628 ◽  
Author(s):  
Tingji Tang ◽  
Andreas Herrmann ◽  
Kalina Peneva ◽  
Klaus Müllen ◽  
Stephen E. Webber
Keyword(s):  
Energy Transfer ◽  
Molecular Layer ◽  
Water Soluble ◽  
Layer By Layer ◽  
Perylene Diimides

scholarly journals New Insight into the Influence of Rhamnolipid Bio-Surfactant on the Carbonate Rock/Water/Oil Interaction at Elevated Temperature

Resources ◽  
2018 ◽  
Vol 7 (4) ◽  
pp. 75
Author(s):  
Sina Rezaei Gomari ◽  
Kamal Elyasi Gomari ◽  
Meez Islam ◽  
David Hughes
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Carbonate Rock ◽  
Contact Angles ◽  
Water Soluble ◽  
Water Flooding ◽  
Wettability Alteration ◽  
Surfactant Solutions ◽  
Washing Process ◽  
The Impact

Tertiary recovery is directly dependent on the alteration in wettability and interfacial tension (IFT), hence releasing the trapped oil from rock pore spaces. Bio-surfactant water flooding to mobilise residual oil in reservoirs is a new and developing prospect that can be used more often in future due to its environmentally friendly nature and economic advantages. In this work, the impact of rhamnolipids as water soluble bio-surfactant solutions on the interfacial activities of saline water and the wettability of carbonate rock are studied at elevated temperature. The effectiveness of the bio-surfactant as a rock wettability modifier is analysed in the presence of different salinities, in particular SO42− ions. The reason for the focus on SO42− is its high affinity towards calcite surfaces, and hence its ability to intervene strongly on bio-surfactant performance. To achieve the objectives of this study, the oil-wet calcite samples at elevated temperature were put through a washing process that included bio-surfactant solutions in seawater at various concentrations of sodium sulphate ions, where the measurement of the contact angles of each sample after treatment and the IFT between the oil model and the washing solutions were taken. The obtained results illustrated that bio-surfactants (rhamnolipids) with incremental concentrations of SO42− ions in sea water (up to three times higher than the original ion concentration) can lower the IFT, and assessed changing the rocks towards greater water-wettability. This study reveals that the alteration of SO42− ions had a greater impact on the wettability alteration, whereas rhamnolipids were better at reducing the IFT between the oil phase and the aqueous phase. This study also looked at temperatures of 50 °C and 70 °C, which demonstrated undesired influences on the wettability and IFT. Bio-surfactants at high temperature showed less interfacial activity, thus indicating that rhamnolipids are not active at high temperatures, while the addition of SO42− shows a continuous decrease in the contact angle and IFT measurements at high temperature.

Influence of Triton X-100 and SDBS on the Sorption of Streptomycin Sulfate from Soil

2012 ◽  
Vol 610-613 ◽  
pp. 186-189
Author(s):  
Hong Mei Zhao ◽  
Yong Li Liang ◽  
Wen Yan Zhao
Keyword(s):  
Anionic Surfactant ◽  
Contaminated Soils ◽  
Soil Washing ◽  
Distribution Coefficients ◽  
Water Soluble ◽  
Streptomycin Sulfate ◽  
Surfactant Solutions ◽  
Remediation Efficiency ◽  
Triton X ◽  
The Impact

Although surfactants have been considered in surfactant-aided soil washing systems, there is little information on the adsorption of the impact of surfactant on the adsorption of antibiotic, and this may have significant implications for the soil. In this study, Triton X-100 and SDBS were selected to study its effect on the sorption of Streptomycin sulfate from soil under equilibrium sorption. The adsorption of Streptomycin sulfate on soils in surfactant free and surfactant solutions of different critical micelle concentrations (CMCs) has been studied .The applied surfactant concentrations (X) ranged from below the (nominal) CMC to 5 times the CMC. For relatively water-soluble Streptomycin sulfate, the distribution coefficients with anionic surfactant (Kd*) deceeded those without surfactant (Kd), while non-ionic (Kd*) all exceeded those without surfactant (Kd). The Kd*/Kd ratios were used to evaluate the efficiency of surfactants and it was found that anionic surfactant is a better choice for remediation of contaminated soils whereas non-ionic surfactants leads to poor remediation efficiency.

Stability and Antimicrobial Efficiency of Eugenol Encapsulated in Surfactant Micelles as Affected by Temperature and pH

2005 ◽  
Vol 68 (7) ◽  
pp. 1359-1366 ◽  
Author(s):  
SYLVIA GAYSINSKY ◽  
P. MICHAEL DAVIDSON ◽  
BARRY D. BRUCE ◽  
JOCHEN WEISS
Keyword(s):  
Optical Density ◽  
Inhibitory Concentration ◽  
Water Soluble ◽  
Escherichia Coli O157 ◽  
Surfactant Micelles ◽  
E Coli ◽  
Antimicrobial Efficiency ◽  
Surfactant Solutions ◽  
Dilution Assay ◽  
Microbroth Dilution

Growth inhibition of four strains of Escherichia coli O157:H7 (H1730, F4546, 932, and E0019) and Listeria monocytogenes (Scott A, 101, 108, and 310) by eugenol encapsulated in water soluble micellar nonionic surfactant solutions (Surfynol 485W) adjusted to pH 5, 6, and 7 and incubated at 10, 22, and 32°C was determined. Concentrations of eugenol ranged from 0.2 to 0.9% at a surfactant concentration of 5%. Antimicrobial activity was assessed using a microbroth dilution assay. Eugenol encapsulated in surfactant micelles inhibited both microorganisms at pH 5, 6, and 7. At pH 5, some inhibition occurred in the absence of eugenol, i.e., by the surfactant itself (optical density at 24 h for L. monocytogenes = 0.07 and optical density at 24 h for E. coli O157:H7 = 0.09), but addition of >0.2% eugenol led to complete inhibition of both microorganisms. Inhibition of L. monocytogenes and E. coli O157:H7 decreased with increasing pH, that is, the minimum inhibitory concentration was 0.2, 0.5, and 0.5% of micellar encapsulated eugenol solutions at pH 5, 6, and 7, respectively. The encapsulated essential oil component in surfactant micelles was effective at all three temperatures tested (10, 22, and 32°C), indicating that the activity of encapsulated eugenol was not affected by high or low (refrigeration) temperatures. Overall, strains of E. coli O157:H7 were more sensitive than strains of L. monocytogenes. Improved activity was attributed to increased solubility of eugenol in the aqueous phase due to the presence of surfactants and improved interactions of antimicrobials with microorganisms.

Synthesis and properties of amino acid functionalized water-soluble perylene diimides

2015 ◽  
Vol 32 (7) ◽  
pp. 1427-1433 ◽  
Author(s):  
Yongshan Ma ◽  
Xuemei Li ◽  
Xiaofeng Wei ◽  
Tianyi Jiang ◽  
Junsen Wu ◽  
...  
Keyword(s):  
Amino Acid ◽  
Water Soluble ◽  
Perylene Diimides

Molecular Layer-by-Layer Self-Assembly of Water-Soluble Perylene Diimides through π−π and Electrostatic Interactions

Langmuir ◽  
2006 ◽  
Vol 22 (1) ◽  
pp. 26-28 ◽  
Author(s):  
Tingji Tang ◽  
Jiangqiang Qu ◽  
Klaus Müllen ◽  
Stephen E. Webber
Keyword(s):  
Self Assembly ◽  
Electrostatic Interactions ◽  
Molecular Layer ◽  
Water Soluble ◽  
Layer By Layer ◽  
Perylene Diimides
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