title: Hyperbranched exopolysaccharide-enhanced foam properties of sodium fatty alcohol polyoxyethylene ether sulfate.
abstract: The foam properties, such as the foamability, foam stability, drainage, coalescence and bulk rheology, of aqueous solutions containing an eco-friendly exopolysaccharide (EPS) secreted by a deep-sea mesophilic bacterium, Wangia profunda SM-A87, and an anionic surfactant, sodium fatty alcohol polyoxyethylene ether sulfate (AES), were studied. Both the foamability and foam stability of the EPS/AES solutions are considerably higher than those of single AES solutions, even at very low AES concentrations, although pure EPS solutions cannot foam. The improved foamability and foam stability arise from the formation of the EPS/AES complex via hydrogen bonds at the interfaces. The synergism between the EPS and AES decreases the surface tension, increases the interfacial elasticity and water-carrying capacity, and suppresses the coalescence and collapse of the foams. The EPS/AES foams are more salt-resistant than the AES foams. This work provides not only a new eco-friendly foam with great potential for use in enhanced oil recovery and health-care products but also useful guidance for designing other environmentally friendly foam systems that exhibit high performance.
authors: Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100, PR China.
authors: Quanhua
authors: Q
authors: Deng
authors: National Engineering Research Center for Colloidal Materials, Shandong University, Jinan 250100, PR China.
authors: Haiping
authors: H
authors: Li
authors: Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100, PR China.
authors: Haoyang
authors: H
authors: Sun
authors: Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100, PR China.
authors: Yange
authors: Y
authors: Sun
authors: Key Laboratory for Colloid and Interface Chemistry of Education Ministry, Shandong University, Jinan 250100, PR China. Electronic address: yingli@sdu.edu.cn.
authors: Ying
authors: Y
authors: Li
mesh_terms: D004987:Ethers / Q000737:chemistry*; D005233:Fatty Alcohols / Q000737:chemistry*; D006860:Hydrogen Bonding; D008958:Models, Molecular; D015394:Molecular Structure; D011092:Polyethylene Glycols / Q000737:chemistry*; D011135:Polysaccharides, Bacterial / Q000737:chemistry*; D012212:Rheology; D012996:Solutions / Q000737:chemistry; D013500:Surface Tension; D013501:Surface-Active Agents / Q000737:chemistry*; D014783:Viscosity; D014867:Water / Q000737:chemistry
chemical_list: D004987:Ethers; D005233:Fatty Alcohols; D011135:Polysaccharides, Bacterial; D012996:Solutions; D013501:Surface-Active Agents; C527382:sodium nonylphenol polyoxyethylene ether sulfate; D014867:Water; D011092:Polyethylene Glycols
keywords: AES; Exopolysaccharide; Foam stability; Foamability; Hydrogen bond