Effects of dioctadecyl dimethyl ammonium chloride on the rheological behavior of behenyl trimethyl ammonium chloride/1-hexadecanol/water ternary system

Akatsuka, Hidetaka; Ohara, Yasuhiro; Otsubo, Yasufumi

doi:10.1016/j.jcis.2006.06.020

Cited by 16 publications

(11 citation statements)

References 31 publications

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“…We previously found that the viscosity of the α-gel samples decreased as the shear rate increased (shear thinning) . This is a typical behavior in α-gel systems. ,,,,− We hypothesize that the shear thinning results from either the structural change (collapse) of the α-gel domains or the increased amount of excess water caused by shear flow. Therefore, we studied the α-gel bilayer structures under various shear rates (0, 0.001, 0.01, 0.1, 1, and 10 s –1 ) by the Rheo-SANS measurements.…”

Section: Resultsmentioning

confidence: 83%

Structural Change of an α-Gel (α-Form Hydrated Crystal) Induced by Temperature and Shear Flow in an Oleic Acid Based Gemini Surfactant System

et al. 2020

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We studied the effects of temperature and shear flow on the structures of α-gel bilayers and domains. The α-gel samples were prepared by a carboxylate-type gemini surfactant synthesized from oleic acid and a long-chain alcohol (1-tetradecanol) with water. The structural change as a function of temperature was investigated using small-and wide-angle X-ray scattering (SWAXS) measurements, spin−spin relaxation time (T 2 ) measurements, and optical microscopy observations. SWAXS measurements suggested that the decreased temperature yielded the α-gel phase from a lamellar liquid-crystal phase. We also found that the lamellar d-spacing drastically decreased at the phase transition temperature. The T 2 measurements suggested that two kinds of protons with different mobilities coexisted in amphiphiles consisting of lamellar bilayers. The abundance of the protons with low mobility increased with decreasing temperature. Optical microscopy results indicated that the size of the α-gel domains increased with decreasing temperature. We assumed that the increased abundance of the low-mobility protons, indicating low flexibility of lamellar bilayers, led to a decreased lamellar d-spacing and increased size of the α-gel domains. Shear-induced structural changes in the α-gel were also studied using simultaneous small-angle neutron scattering and rheological measurements. The α-gel can maintain bilayer structures even at high shear rates. We also found that the lamellar d-spacing was independent of the shear rate.

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Section: Resultsmentioning

confidence: 83%

Structural Change of an α-Gel (α-Form Hydrated Crystal) Induced by Temperature and Shear Flow in an Oleic Acid Based Gemini Surfactant System

et al. 2020

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“…It should also be noted that these effects were obtained at pH's ∼6, a condition that can lead to the formulation of an surfactant‐based preparation for skin protection. DODAC is a well known and utilized component of hair conditioners,52 and pralidoxime is utilized for the treatment of intoxications from phosphate‐derived pesticides and nerve gases 2, 53, 54…”

Section: Discussionmentioning

confidence: 99%

Outcomes after the use of gastrostomy tubes in patients whose head and neck cancer was managed with radiation therapy

et al. 2010

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“…5 With the addition of alcohol to the ionic surfactant solutions, the mixtures are sometimes strongly turbid throughout the sample without macroscopic phase separation, and they are highly viscous, a property that is applied to the cosmetic industry. 6 In the pseudo binary systems, the lamellar domains in ∼μm scale are dispersed in solutions with network formations. 7 Therefore, it is important for applications in the industrial fields to investigate the structural formations of lamellar domains below the Krafft temperature.…”

Section: ■ Introductionmentioning

confidence: 99%

Microscopic Investigation on Morphologies of Bilayer Gel Structure in the Mixed Polyoxyethylene-Type Nonionic Surfactant Systems

2012

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We investigated morphologies of lamellar domains below the Krafft temperature in the mixed polyoxyethylene-type nonionic surfactant, a C(16)E(6)/C(16)E(7)/water system, by using optical microscopy, confocal microscopy, small/wide-angle X-ray scattering, and small-angle neutron scattering. We have found that the morphology discontinuously changes from network structures of lamellar domains to spherical vesicles with increasing mole fraction of C(16)E(7), via the coexistence region of vesicles and network structures of lamellar domains.

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Effects of dioctadecyl dimethyl ammonium chloride on the rheological behavior of behenyl trimethyl ammonium chloride/1-hexadecanol/water ternary system

Cited by 16 publications

References 31 publications

Structural Change of an α-Gel (α-Form Hydrated Crystal) Induced by Temperature and Shear Flow in an Oleic Acid Based Gemini Surfactant System

Structural Change of an α-Gel (α-Form Hydrated Crystal) Induced by Temperature and Shear Flow in an Oleic Acid Based Gemini Surfactant System

Outcomes after the use of gastrostomy tubes in patients whose head and neck cancer was managed with radiation therapy

Microscopic Investigation on Morphologies of Bilayer Gel Structure in the Mixed Polyoxyethylene-Type Nonionic Surfactant Systems

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