Influence of Electrolytes on Foaming of Sodium Lauryl Sulfate

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A novel anionic gemini surfactant containing an ester bond in the spacer group was synthesized using cardanol as the raw material and characterized by IR, 1H NMR and 13C NMR. The surface properties of the gemini surfactant were investigated and compared with its corresponding single chain surfactant counterpart. It was found that this novel gemini surfactant exhibited a low critical micelle concentration value (1.9 mM) and good efficiency in reducing surface tension of water (33.6 mN/m). The gemini surfactant was found to have antimicrobial activity against Gram‐negative (Escherichia coli and Pseudomonas aeruginosa), Gram‐positive (Bacillus subtilis and Staphylococcus aureus) bacteria and fungi (Aspergillus niger, Aspergillus flavus, Candida albicans and Rhizopus stolonifer). The gemini as well as the corresponding single chain surfactant showed good antimicrobial activity against all pathogenic microorganisms studied and can be employed as an antimicrobial agent. The synthesized novel anionic gemini surfactant possesses an excellent wettability and low foamability.

Section: Foamability Studymentioning

confidence: 99%

Novel Ester‐linked Anionic Gemini Surfactant: Synthesis, Surface‐Active Properties and Antimicrobial Study

Ahire

Bhagwat

2017

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“…The rate of fine foam generation determined at each surfactant concentration is taken as a measure of foamability. All the experiments were carried out at a temperature at 303 ± 2 K. The details of this method are given in our earlier publication [14].…”

Section: Dynamic Surface Tensionmentioning

confidence: 99%

Mixed Micellization of Polyoxyethylene (20) Oleyl Ether with Cetylpyridinium Chloride at the Air–Water Interface

Desai

Bhagwat

2016

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Adsorption and micellization behaviour of binary surfactant mixtures containing a nonionic surfactant, polyoxyethylene (20) oleyl ether (C18‐1E20), and a cationic surfactant, cetylpyridinium chloride (CPC), was studied at the air–water interface using the Wilhelmy plate method. A pseudo‐phase separation model was used to analyse mixed micellization. A Margules equation with one constant (interaction parameter, β) was fitted to the nonideal behaviour of the mixed surfactant system. This system shows synergism (β = −6.0) for micellization. The dynamic behaviour and foamability of binary mixtures at the same bulk concentration and at different mole fractions were also studied using drop volume and horizontal impinging jet methods, respectively. It was found that with an increase in the mole fraction of C18‐1E20, the foamability of a mixture increases and t* value decreases.

“…The generation of foam requires the introduction of a gas into a liquid in the presence of a surfactant. Increased temperature supports foam generation but negatively affects the foam stability (Powale & Bhagwat, 2006;Sharma, Shah, & Brigham, 1985;Wang, Guo, Zheng, Wang, & Zhan, 2017). Foam stability depends on various parameters such as surface tension, temperature, rheological properties (surface viscosity and elasticity), liquid composition, pH, etc.…”

Section: Introductionmentioning

confidence: 99%

Comparative Investigation of Dynamic Foam Behavior of Air–Water and CO₂–Water Systems

Bathe

Bhagat

Chaudhari

2018

The purpose of this study was to understand and compare the dynamic foam behavior of the surfactant Tween‐20 in air–water and CO2–water systems. The foam height in the CO2–water system was less than that in the air–water system, but the foam stability was better in the CO2–water system. The effect of temperature on axial dye displacement and foam bubble size was studied, where the foam generation ability of the surfactant was directly proportional to the temperature, while the foaminess was inversely proportional. The observed highest foam volume for the air–water system was 3922 ± 181 cm3 and for the CO2–water system 3195 ± 181 cm3 at 5.0 g L–1 of surfactant at air flow rate of 1 liter per minute (LPM) at 52 °C. The half‐life for the air–water and the CO2–water system was 110 and 40 s, respectively, at 5.0 g L–1 of surfactant at the air flow rate of 1 LPM and 28 °C. In wet foam, the liquid holdup range for the air–water system was 0.38–0.52% and for the CO2–water system 0.51–0.72% in the concentration range 1.0–5.0 g L–1 at 1 LPM gas flow rate.