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Xuefeng Liu – One of the best experts on this subject based on the ideXlab platform.

  • a worm containing viscoelastic fluid based on single Amine Oxide surfactant with an unsaturated c22 tail
    RSC Advances, 2015
    Co-Authors: Yongmin Zhang, Xuefeng Liu

    Abstract:

    “Worm”-containing viscoelastic fluids formed by single C22-tailed surfactants have attracted special interests over the past decade due to their unique rheological response. Here, a viscoelastic wormlike micellar solution of erucyldimethyl amidopropyl Amine Oxide (EMAO) was first reported and investigated. Upon increasing concentration, EMAO can self-assembly into micelles at a very low concentration, and then these micelles grow into long threadlike worms, which further entangle with each other in the semi-dilute region (>0.55 mM), enhancing the viscosity by several orders of magnitude. EMAO worms exhibit a smaller sensitivity to pH at room temperature than those of short-chain counterparts, but show evident pH responsiveness at high temperature due to the presence of multiple hydrogen bonds and cloud point, which is barely observed for short-chain Amine Oxide surfactants. The hydrogen bonds and cloud point also result in an uncommon thermo-thickening behaviour in a certain temperature range. Compared with short-chain Amine Oxide worms, EMAO worm possesses stronger thickening ability, better biodegradable and lower toxicity, giving it a rich prospective for use in gel cleaners, clear fracturing fluids, etc.

  • A “worm”-containing viscoelastic fluid based on single Amine Oxide surfactant with an unsaturated C22-tail
    RSC Advances, 2015
    Co-Authors: Yongmin Zhang, Xuefeng Liu

    Abstract:

    “Worm”-containing viscoelastic fluids formed by single C22-tailed surfactants have attracted special interests over the past decade due to their unique rheological response. Here, a viscoelastic wormlike micellar solution of erucyldimethyl amidopropyl Amine Oxide (EMAO) was first reported and investigated. Upon increasing concentration, EMAO can self-assembly into micelles at a very low concentration, and then these micelles grow into long threadlike worms, which further entangle with each other in the semi-dilute region (>0.55 mM), enhancing the viscosity by several orders of magnitude. EMAO worms exhibit a smaller sensitivity to pH at room temperature than those of short-chain counterparts, but show evident pH responsiveness at high temperature due to the presence of multiple hydrogen bonds and cloud point, which is barely observed for short-chain Amine Oxide surfactants. The hydrogen bonds and cloud point also result in an uncommon thermo-thickening behaviour in a certain temperature range. Compared with short-chain Amine Oxide worms, EMAO worm possesses stronger thickening ability, better biodegradable and lower toxicity, giving it a rich prospective for use in gel cleaners, clear fracturing fluids, etc.

  • Synthesis and Surface Properties of N,N-Dimethyl-N-dodecyl Polyoxyethylene Amine-Based Surfactants: Amine Oxide, Betaine and Sulfobetaine
    Journal of Surfactants and Detergents, 2013
    Co-Authors: Liya Hou, Huinian Zhang, Hui Chen, Qibo Xia, Dongyang Huang, Li Meng, Xuefeng Liu

    Abstract:

    Nonionic–zwitterionic hybrid surfactants, namely N,N-dimethyl-N-dodecyl polyoxyethylene (3) Amine Oxide, and the corresponding betaine and/or sulfobetaine, have been synthesized. Their molecule structures were characterized by means of electrospray ionization mass spectrometry and 1H nuclear magnetic resonance. Compared to the structurally related conventional Amine Oxide, betaine and sulfobetaine, the critical micelle concentrations of the three hybrid surfactants are one order of magnitude smaller than those of traditional ones. The polyoxyethylene segment between the hydrophilic head group and the hydrophobic tail makes the surface activities of the hybrid surfactants superior to their structure-related counterparts.

Yongmin Zhang – One of the best experts on this subject based on the ideXlab platform.

  • a worm containing viscoelastic fluid based on single Amine Oxide surfactant with an unsaturated c22 tail
    RSC Advances, 2015
    Co-Authors: Yongmin Zhang, Xuefeng Liu

    Abstract:

    “Worm”-containing viscoelastic fluids formed by single C22-tailed surfactants have attracted special interests over the past decade due to their unique rheological response. Here, a viscoelastic wormlike micellar solution of erucyldimethyl amidopropyl Amine Oxide (EMAO) was first reported and investigated. Upon increasing concentration, EMAO can self-assembly into micelles at a very low concentration, and then these micelles grow into long threadlike worms, which further entangle with each other in the semi-dilute region (>0.55 mM), enhancing the viscosity by several orders of magnitude. EMAO worms exhibit a smaller sensitivity to pH at room temperature than those of short-chain counterparts, but show evident pH responsiveness at high temperature due to the presence of multiple hydrogen bonds and cloud point, which is barely observed for short-chain Amine Oxide surfactants. The hydrogen bonds and cloud point also result in an uncommon thermo-thickening behaviour in a certain temperature range. Compared with short-chain Amine Oxide worms, EMAO worm possesses stronger thickening ability, better biodegradable and lower toxicity, giving it a rich prospective for use in gel cleaners, clear fracturing fluids, etc.

  • A “worm”-containing viscoelastic fluid based on single Amine Oxide surfactant with an unsaturated C22-tail
    RSC Advances, 2015
    Co-Authors: Yongmin Zhang, Xuefeng Liu

    Abstract:

    “Worm”-containing viscoelastic fluids formed by single C22-tailed surfactants have attracted special interests over the past decade due to their unique rheological response. Here, a viscoelastic wormlike micellar solution of erucyldimethyl amidopropyl Amine Oxide (EMAO) was first reported and investigated. Upon increasing concentration, EMAO can self-assembly into micelles at a very low concentration, and then these micelles grow into long threadlike worms, which further entangle with each other in the semi-dilute region (>0.55 mM), enhancing the viscosity by several orders of magnitude. EMAO worms exhibit a smaller sensitivity to pH at room temperature than those of short-chain counterparts, but show evident pH responsiveness at high temperature due to the presence of multiple hydrogen bonds and cloud point, which is barely observed for short-chain Amine Oxide surfactants. The hydrogen bonds and cloud point also result in an uncommon thermo-thickening behaviour in a certain temperature range. Compared with short-chain Amine Oxide worms, EMAO worm possesses stronger thickening ability, better biodegradable and lower toxicity, giving it a rich prospective for use in gel cleaners, clear fracturing fluids, etc.

Debora Berti – One of the best experts on this subject based on the ideXlab platform.

  • an Amine Oxide surfactant based microemulsion for the cleaning of works of art
    Journal of Colloid and Interface Science, 2015
    Co-Authors: Michele Baglioni, Yareli Jaidar Benavides, Debora Berti, Rodorico Giorgi, Uwe Keiderling, Piero Baglioni

    Abstract:

    Surfactant-based aqueous fluids, such as micellar solutions and microemulsions, are effective, safe and selective media for cleaning operations in conservation of cultural heritage. The search for better-performing systems and eco-friendly cleaning systems is currently a major goal in conservation science. We report here on a ternary o/w microemulsion, composed of diethyl carbonate (DC) as the oil phase and N,N-Dimethyldodecan-1-Amine Oxide (DDAO) as the surfactant. DDAO is a well known and widely used detergent and solubilizing agent, selected here for its degradability and eco-compatibility. Due to its nonionic/cationic nature, it can be used also when nonionic-based formulations become ineffective because of clouding and phase separation. Moreover, DDAO is insensitive to the presence of divalent metal ions, usually abundant in wall paintings substrates. Small-Angle Neutron Scattering (SANS) provided detailed information about the nanostructure of the surfactant aggregates. Finally, the cleaning effectiveness of the nanofluid was assessed both on fresco mock-ups and on real wall paintings conserved in the archeological site of Tulum, Mexico. Here, conservators successfully used the microemulsion to remove naturally aged films of complex polymer mixtures from the works of art surface.

  • Viscoelastic solutions formed by worm-like micelles of Amine Oxide surfactant.
    Journal of Colloid and Interface Science, 2010
    Co-Authors: Lucia Brinchi, Raimondo Germani, Gianfranco Savelli, P. Di Profio, Luisa Marte, Debora Berti

    Abstract:

    Abstract Formation and properties of viscoelastic wormlike aqueous micellar solutions of the zwitterionic surfactant p-dodecyloxybenzyldimethylAmine Oxide (pDoAO) were studied. Semi-dilute aqueous solutions of pDoAO show a sharp increase in viscosity, which exceeds 160 cST for concentrations >50 mM, leading to viscoelastic solutions. Viscoelasticity relates to the surfactant charge type. In fact this viscoelastic system reverses to fluid when acid is added (pH