Lamellar Liquid Crystals of Brij 97 Aqueous Solutions Containing Different Additives

Wang, Zhongni; Wu, Zhou

doi:10.1007/s10953-009-9399-y

Cited by 27 publications

(18 citation statements)

References 17 publications

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“…In the nonlinear viscoelastic region, the large deformation destroys the intermediate structure leading to the flow alignment of the material, and G 00 becomes higher than G 0 . Such spectra have also been observed in our previously reported Brij 97 lamellar liquid crystals, [15] the lamellar phase formed in PGNE10=toluene=water system, [20] and in DDAB=lecithin=water system. [29] Frequency sweep measurements were performed on S B , S C and S D at a constant stress of 1.0 Pa, which was found to be in the linear viscoelastic domain in all the cases.…”

Section: Linear Viscoelasticitysupporting

confidence: 84%

“…[14] They considered the lamellar mesophase as a weak gel, but quantitative descriptions were not used for the explanation of the experimental results. In our previous works, it was found that different solvents clearly influence the rheological properties of lamellar liquid crystals formed by a traditional alkyl polyoxyethylene ether surfactant, [15] and phase transitions between different liquid crystals even occur depending on compositions. [16] In this work, three aqueous media and three relatively a polar solvents were chosen that are all pharmaceutically accepted and commercially available.…”

Section: Please Scroll Down For Articlementioning

confidence: 98%

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Lamellar Liquid Crystals Formed in Ternary DEP/Oil/Water Systems

Wang

Zhao

et al. 2013

Journal of Dispersion Science and Technology

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Lamellar liquid crystals of the nonionic surfactant dodecyl polyoxyethylene (4) polyoxypropylene (5) ether (DEP) were investigated by means of phase diagram and rheological technique at 25 C in the presence of different solvents. The aqueous medium includes pure water, physiological saline and 20% sucrose solution, and the oil phase includes isopropyl myristate (IPM), oleic acid, and geraniol, which are all pharmaceutically accepted chemicals. The steady and dynamic rheological property analyses of the lamellar liquid crystals formed in DEP/H 2 O/IPM system indicate that the lamellar samples constructed by this special surfactant behave as pseudo-plastic fluid with relatively high elasticity and possess defects in their assembled structure. Also in this system, the elastic character gets decreased with increase in the water content. Furthermore, the comparison investigations show that the relatively high polar oil component increases the network strength of the lamellar phase, while increase in the polarity of water phase enhances the structure defects.

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Section: Linear Viscoelasticitysupporting

confidence: 84%

Section: Please Scroll Down For Articlementioning

confidence: 98%

Lamellar Liquid Crystals Formed in Ternary DEP/Oil/Water Systems

Wang

Zhao

et al. 2013

Journal of Dispersion Science and Technology

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“…The composition of 40 wt% surfactant and 60 wt% mixed solvent with the H 2 O/IL mass ratio of 4/1 was the same for both systems. The samples were prepared and stored in the same manner as in our previous work [27]. After complete equilibration, sample P looks slightly gray-turbid in appearance, while sample B is fully transparent and a little stiffer than sample P.…”

Section: Materials and Sample Preparationmentioning

confidence: 99%

Phase Transitions of Nonionic Surfactant C_18:1E₁₀ in Mixed Media of Water with Ionic Liquids

Wang

Guan

2015

J Surfact & Detergents

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Complicated temperature-induced phase transitions were shown in two hexagonal liquid crystal mesophases constructed by nonionic surfactant C 18:1 E 10 in the media of water with ionic liquids, 1-butyl-3-methylimidazolium tetrofluoroborate (bmim-BF 4 ) and 1-butyl-3-methylimidazolium hexafluorophosphate (bmim-PF 6 ), respectively. Detailed phase transition information was extracted from rheological, polarized optical microscopy, deuterium magnetic resonance spectroscopy and smallangle X-ray scattering measurements, with good agreement among these techniques. It is shown that the order-to-disorder phase transition occurred in a narrow range of temperatures for both the two hexagonal mesophases. In particular, the mesophases experienced a biphasic hexagonal-lamellar coexisting before completely melting, which was not found in the corresponding aqueous hexagonal system of the same surfactant concentration. Of most importance, the two target mesophases exhibited some clearly different behaviors. The phase transition temperature is much higher (ca. 10°C) in a (water ? bmim-BF 4 ) system than in a (water ? bmim-PF 6 ) system. After melting, a fast transition from elastic micelle to Newtonian fluid was observed in the (water ? bmim-BF 4 ) system, while the micelle related to the (water ? bmim-PF 6 ) system remained elastic over a relatively wide temperature region. The results obtained give a better insight of how the mixed solvents support mesophase formation and modulate the phase transition.

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“…17 The mesophase of liquid crystalline structures can be determined according to relationships among the distances of the Bragg peaks on the scattering vector (q). 50 Moreover, it is possible to calculate structural parameters (eg, crystal lattice size) related to the peak positions. 17 The equation d =2π/q max , where q max is the q value at peak intensity I(q), can be used to calculate the correlation distance between the scattering objects.…”

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confidence: 99%

Physicochemical characterization of drug nanocarriers

Manaia

Abuçafy

Chiari-Andréo

et al. 2017

IJN

137

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Pharmaceutical design has enabled important advances in the prevention, treatment, and diagnosis of diseases. The use of nanotechnology to optimize the delivery of drugs and diagnostic molecules is increasingly receiving attention due to the enhanced efficiency provided by these systems. Understanding the structures of nanocarriers is crucial in elucidating their physical and chemical properties, which greatly influence their behavior in the body at both the molecular and systemic levels. This review was conducted to describe the principles and characteristics of techniques commonly used to elucidate the structures of nanocarriers, with consideration of their size, morphology, surface charge, porosity, crystalline arrangement, and phase. These techniques include X-ray diffraction, small-angle X-ray scattering, dynamic light scattering, zeta potential, polarized light microscopy, transmission electron microscopy, scanning electron microcopy, and porosimetry. Moreover, we describe some of the commonly used nanocarriers (liquid crystals, metal–organic frameworks, silica nanospheres, liposomes, solid lipid nanoparticles, and micelles) and the main aspects of their structures.

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Lamellar Liquid Crystals of Brij 97 Aqueous Solutions Containing Different Additives

Cited by 27 publications

References 17 publications

Lamellar Liquid Crystals Formed in Ternary DEP/Oil/Water Systems

Lamellar Liquid Crystals Formed in Ternary DEP/Oil/Water Systems

Phase Transitions of Nonionic Surfactant C_18:1E₁₀ in Mixed Media of Water with Ionic Liquids

Physicochemical characterization of drug nanocarriers

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Lamellar Liquid Crystals of Brij 97 Aqueous Solutions Containing Different Additives

Cited by 27 publications

References 17 publications

Lamellar Liquid Crystals Formed in Ternary DEP/Oil/Water Systems

Lamellar Liquid Crystals Formed in Ternary DEP/Oil/Water Systems

Phase Transitions of Nonionic Surfactant C18:1E10 in Mixed Media of Water with Ionic Liquids

Physicochemical characterization of drug nanocarriers

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Product

Resources

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Phase Transitions of Nonionic Surfactant C_18:1E₁₀ in Mixed Media of Water with Ionic Liquids