Interfacial and wetting behavior of natural–synthetic mixed surfactant systems

Abstract

Interfacial and wetting behavior of a double chain cationic synthetic surfactant di-dodecyldimethyl ammonium bromide (DDAB), a natural surfactant (Shikakai), and their mixtures of five different ratios have been studied by surface tension and dynamic contact angle measurements. Pure Shikakai has higher surface tension and contact angle values at critical micelle concentration (CMC) than DDAB, indicating that it is inferior to DDAB and also commonly used synthetic surfactants. Addition of DDAB to Shikakai gives a gradual lowering of the CMC, surface tension and contact angle values at the CMC. When the concentration of DDAB is $50 mol% the final surface tension and contact angle values are very close to those of pure DDAB. The mixed surfactant solutions show strong non-ideal solution behaviour because of the interaction between the two surfactants. As the wetting properties of a natural surfactant are enhanced in the presence of a synthetic surfactant, the use of plant-synthetic mixed surfactant systems may be useful in wetting and in several other applications. At the same time the consumption of synthetic surfactant can also be reduced.

Aegle marmelosLeaf Extract and Plant Surfactants Mediated Green Synthesis of Au and Ag Nanoparticles by Optimizing Process Parameters Using Taguchi Method

“…The method of preparation and purification was detailed in our previous studies as that of Reetha 13,14 and detailed in brief in SI-I. The structures of three plant saponins are given in Figure 1.…”

“…the size and morphologies of the experimental trials with nos 10,13,11,9. for Ag NPs and trials with nos.…”

“…The particle sizes from these experiments are comparatively higher and are not nearly uniform when compared with the Ag and Au NPs formed from parameters of optimized conditions (Figure 5). While analyzed the morphologies of the Ag NPs particles of different trials (trial nos 10,13,11,9). and compared with their individual extinction spectra, one can notice two major changes.…”

Synergism between non-ionic and cationic surfactants in a concentration range of mixed monolayers at an air–water interface

“…The interfacial and micellar properties of surfactant mixtures have been extensively studied because of their wide applications, such as hydrate promoters (or inhibitors), biologicals, detergents (foaming), in fabric soening, pharmaceuticals, enhanced oil recovery process etc. [1][2][3][4] In most cases, the mixture of surfactants oen has a better ability to modify the interfacial properties and to generate a high foam volume than the individual surfactants and also the mixtures are advantageous because the purication of a single compound may be too costly and difficult. [4][5][6][7][8] When two or more surfactants are present in a solution, a mixed monolayer in the interface and mixed micelles in bulk solution are formed as a result of a complex balance of intermolecular forces.…”

Investigations on Natural Surfactant obtained from Soap-Nuts through Spectrophotometric Interactions with Congo Red and Comparison with Commercial Surfactants

“…Therefore, use of synthetic surfactants in various applications leads to secondary pollution. To overcome these sensitive environmental problems, a surfactant should be biodegradable and less toxic in addition to being surface active [15]. Natural surfactants were suggested as viable alternative to synthetic surfactants because these were bio-degradable, biocompatible, renewable, low cost, higher foaming capacity, highly selective and specifically active at extreme temperatures, pH and salinity [16] and less toxic and hence pose less threat to the environment.…”