Journal of Surfactants and Detergents最新文献

In response to technical challenges for the production of APG, a synthetic approach for phenyl-linked alkyl glycosides was developed. The key feature of the concept is the separation of the glycosylation from the coupling of surfactant antipodes. This enables the reactions to run in homogenous solution. A series of surfactants was prepared, and their interfacial behavior was studied. The compounds varied in the connections between the aromatic ring and the hydrocarbon chain, on the one hand, and the spacer between the sugar head group and the phenyl linker on the other. High Krafft points, mismatching structurally related phenyl ethoxylate surfactants, suggest π-stacking interaction as a possible source of limited water solubility. The coupling of the complementary surfactant domains via phenyl ether formation required temperatures exceeding the boiling point of low molecular weight alcohols, thereby requesting the use of ethylene-oxide based solvents. Ethylene-glycol linked surfactants suffered from intramolecular cyclization, leading to a low coupling yield.

With the rapid advancement of digital inkjet printing technology, considerable attention has been directed toward the formulation design of inks. In this research, a comprehensive investigation was conducted into the physicochemical properties of reactive dye inks formulated with C.I. Reactive Blue 194. An orthogonal experimental design approach was utilized to optimize the proportions of the various solvents, resulting in the preparation of a reactive dye ink exhibiting exceptional performance. The ink possessed outstanding thermal stability, freeze–thaw stability, and robust centrifugal stability. Additionally, the ink's drying performance was verified; after 185 h of drying, the weight retention rate was 48%, while maintaining good wetting ability. Fabrics printed with this ink demonstrated high-quality results following steaming at 100°C and 100% relative humidity for 10 min. The rubbing and soaping fastness ratings of the printed fabrics were both in the range of grade 4–5, demonstrating excellent color fastness. Moreover, the variation rates of printed line width in the warp and weft directions were 12.05% and 18.79%, respectively, indicating clear pattern definition on cotton fabrics. This study offers strong support for the technological progression and industrial deployment of digital inkjet printing for high-quality textile printing.

It is urgently necessary to develop a highly stable fluorine-free foam system. Optimizing the mixture of surfactants is the key to improving the stability and oil resistance of the foam. This paper systematically studied the application of a binary mixed system composed of non-ionic hydrocarbon surfactants (alkyl glucoside, APG-0810) and two non-ionic organic silicon surfactants (CoatOsil-77 and UF-5811) in the oil resistance of fluorine-free foams. Under both oil-free and oil-containing conditions, the surface tension, conductivity, viscosity, foaming ability and oil resistance were evaluated. Adding n-heptane through micro emulsification increased the surface tension; the conductivity increased in AC# and AU#, while it decreased in CU#. The foaming ability of AC#, AU#, and CU# decreased by 50%, 36.1%, and 75% respectively, and the foam half-life decreased by 40.5%, 50%, and 82.6% respectively. Among them, the AC# system exhibited the best oil resistance, and the liquid film stability persisted for 150 s under oil-containing conditions. The mixture of APG-0810/CoatOsil-77 showed excellent performance, providing a theoretical basis for the design of stable fluorine-free oil-resistant foams.

Green and stimuli-responsive surfactants have become a major research focus in recent years. Herein, a bio-based pH-responsive gemini surfactant (DA-CYS) containing a rigid skeleton was synthesized from dehydroabietic acid and L-cystine. The structure of DA-CYS was characterized by Fourier-transform infrared (FT-IR) and nuclear magnetic resonance (NMR) spectroscopy. The critical micelle concentration (CMC), surface tension, and foam properties of DA-CYS were evaluated. The results showed that DA-CYS demonstrated superior foam stability performance compared to sodium dodecyl sulfate (SDS) at the same concentration. The foam stability of DA-CYS could be precisely controlled via pH modulation. At pH 11.56, DA-CYS formed an ultra-stable foam with a half-life of 2704 min. Whereas acidification to pH 6.33, the foam stability was drastically reduced, yielding a half-life of only 90 min. Remarkably, reversible switching between stable and unstable states was demonstrated over at least five pH cycles (pH 11–6), confirming excellent pH-responsive recoverability. This rosin-based gemini surfactant exhibits pH-responsive recoverability from solution with high recovery rates. This strategy simplifies synthesis processes, aligns with green chemistry principles, and provides new opportunities for developing sustainable surfactant recovery technologies.

The utilization of bio-surfactants in heat transfer enhancement studies remains underexplored compared to synthetic surfactants. This study investigates the effects of Rhamnolipid, a bio-surfactant, on the thermal performance of distilled water (DW) and Al₂O₃ water-based nanofluids (NFs). Rhamnolipid concentrations ranging from 200 to 600 ppm and nanoparticle (NP) concentrations from 0.02 to 0.5 wt.% were studied. The addition of Rhamnolipid to distilled water resulted in the maximization of Thermal Conductivity (TC) at 300 ppm, which aligns with the critical micelle concentration (CMC), leading to a 19.46% improvement in the heat transfer coefficient (HTC). Al₂O₃ NPs alone showed a 32.07% HTC enhancement at 0.05 wt.% concentration, although the performance declined after a few hours due to particle sedimentation. When Rhamnolipid and NPs were combined, HTC increased with Rhamnolipid concentrations up to 550 ppm, after which the performance declined. The combined addition resulted in maximum enhancement of 92.88% HTC at 0.1 wt.% concentrated nanofluid with 550 ppm RHL. These findings demonstrate that eco-friendly bio-surfactants, such as Rhamnolipid, can serve as effective surfactants for enhancing heat conduction performance in NFs.

Wormlike micelles, which are flexible elongated aggregates formed by the self-assembly of surfactant molecules in aqueous solutions, have been widely applied in various fields because of their unique morphology and dynamic characteristics. However, the studies on the unsaturation of tails, particularly in solutions of double-tailed surfactants, remain limited. This study examines the influence of the chemical structure of hydrophobic tails on the formation and rheological properties of wormlike micelles. Two types of double-tailed surfactants with distinct tail structures, one containing double bonds and the other without, were designed and synthesized. The results show that introducing double bonds into the tail significantly affects the formation mechanism and physicochemical properties of wormlike micelles. Wormlike micelles formed from surfactants with double bonds exhibit enhanced rheological properties and viscoelastic behavior. This study enhances the understanding of the relationship between surfactant tail structure and micelle behavior. It provides theoretical and experimental support for the future design of efficient surfactants and offers new perspectives and technical guidance for their application in enhanced oil recovery, drug delivery, and environmental remediation. Future studies could explore the behavior of structurally diverse double-tailed surfactants in more complex solutions, thus expanding their potential applications across broader fields.

This study investigated the effect of non-ionic surfactants in developing the structure of an oxide during preparation by precipitation method using Polysorbate 20 as a surfactant. Effects of surfactant concentration and structure, pH, aging temperature, and zinc doping on oxide properties were investigated. Zinc-doped samples were evaluated for thiophene adsorption in a down-flow packed bed reactor at ~30°C. The use of surfactant modified the structure of aluminum oxide, increasing the fraction of mesopores as well as surface area and pore volume at all concentrations of surfactant. However, the variation of surface area with surfactant concentration was not significant. Bayerite was observed as the predominant phase in all samples. Alkaline pH improved surfactant–hydroxide interaction, increasing average pore size. The surface area of the samples did not differ significantly, but the pore volume increased from 0.6 to 1.1 cc/g as aging temperature increased. A more uniform and narrower mesopore distribution was observed for the oxide prepared in the presence of Polysorbate 20 compared to that prepared using Polysorbate 60 or Polysorbate 80, suggesting higher interaction with the former. Zinc (30 wt%) supported on Polysorbate 20-modified aluminum oxide showed greater thiophene removal than zinc on unmodified oxide, highlighting the effectiveness of surfactant-modified supports for adsorptive applications.

The quality and safety of dairy products is guaranteed mainly by the thorough cleaning of dairy production equipment. A new green and efficient composite cleaning agent is the direction of development. In this publication, response surface optimization design was used to optimize the detergent formulation comprising five surfactants. The cleaning performance of the optimum formula and the antimicrobial activity of nisin and oregano essential oil (OEO) incorporated in the formula were determined. The cleaning agent can dissolve milk residue quickly, be environmentally friendly, safe, non-toxic, and provide excellent cleaning results, which had initially met the actual production needs and is expected to achieve industrialization.