Phase Behavior in the System Pine Needle Oil Monoglycerides-Poloxamer 407-Water at 20.degree.

Landh, Tomas

doi:10.1021/j100085a028

Cited by 219 publications

(205 citation statements)

References 22 publications

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“…The solubilization of oil in the I 1 cubic phase is, in general, not large, although the cubic-phase microemulsion was reported (12)(13)(14)(15)(16), and this would limit the technological applications of cubic phases containing oil in the areas such as drug delivery and cosmetic techniques (17). To increase oil solubilization, the surfactant layer curvature in the I 1 phase should be less positive and a large micelle should be formed.…”

Section: Introductionmentioning

confidence: 99%

Formation of Cubic-Phase Microemulsions with Anionic and Cationic Surfactants at Equal Amounts of Oil and Water

Kunieda

2000

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 99%

Formation of Cubic-Phase Microemulsions with Anionic and Cationic Surfactants at Equal Amounts of Oil and Water

Kunieda

2000

Journal of Colloid and Interface Science

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“…aggregates in binary surfactant/water mixtures (Fontell, 1990). Recently, IPMS of more intricate topology, residing outside the 'regular' class, have been proposed as a description of phases exhibited in particular systems (Landh, 1992). In tandem with this development, a large number of new 'irregular' IPMS have been isolated, principally by the crystallographic methods of Fischer & Koch (1987 and Koch & Fischer (1988, 1990.…”

Section: Introductionmentioning

confidence: 99%

Parametrization of triply periodic minimal surfaces. III. General algorithm and specific examples for the irregular class

Fogden¹

1993

Acta Cryst Sect A

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JORDI RIUS 409 result is obtained for N~arge = 220 and Nsmal I = 200 with 32.5% of the refined sets possessing mean phase errors less than 35°: 7.5, 10.0 and 15.0% in the ranges 0-25, 25-30 and 30-35 ° , respectively.The TVAL structure was selected to show the capability of the tangent formula (12) to refine random phases in the case of a relatively large structure (156 nonhydrogen atoms in the unit cell). The best result was obtained for Nlarg e = 300 and Nsmal ! = 300 (EH)= 1.24). From a total of 200 sets, 12 (6%) show a mean phase error between 30 and 35 ° . Concluding remarksThe viability of solving crystal structures from the direct interpretation of the nonorigin Patterson peaks as a function of the phases has been demonstrated. This result, however, should not be surprising since these peaks contain all the information regarding the atomic arrangement in the structure and, in addition, the atomicity information contained in the removed Patterson origin peak has already been considered in the derivation of the Fourier coefficients GH(q0). AbstractThe construction algorithm of the first two papers of this series [Fogden & Hyde (1992). Acta Cryst. A48, 442-451,575-591] is extended to a general treatment of triply periodic minimal surfaces (containing as a special case the 'regular' class analysed previously). A detailed outline of the parametrization procedure for an arbitrary 'irregular' class surface is provided and verified via a systematic rederivation of the C(P) surface described by Neovius [Bestimmung Zweier Speciellen Periodische Minimalfliichen (1883), Helsinki: Frenckel]. The method is further employed in parametrizing various empirically generated surfaces.

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“…In this respect, largely hydrophilic surfactant stabilizers, similar to F127, are anticipated to expand the hydrophilic headgroup area of the lipid molecules at the lipid-water interface thereby straightening their molecular shapes (from inverse cone towards cylindrical shape). Thus, they change the magnitude of the interfacial spontaneous curvature and induce significant structural alterations in the inverse non-lamellar liquid crystalline phases 59,[69][70] .…”

Section: Discussionmentioning

confidence: 99%

Effects of High Pressure on Internally Self-Assembled Lipid Nanoparticles: A Synchrotron Small-Angle X-ray Scattering (SAXS) Study

et al. 2016

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We present the first report on the effect of hydrostatic pressure on colloidally stabilized lipid nanoparticles enveloping inverse non-lamellar self-assemblies in their interiors. These internal self-assemblies were systematically tuned into bicontinuous cubic (Pn3m and Im3m), micellar cubic (Fd3m), hexagonal (H2), and inverse micellar (L2) phases by regulating the lipid-oil ratio while the hydrostatic pressure was varied from atmospheric pressure to 1200 bar, and back to the atmospheric pressure. The pressure effect on these lipid nanoparticles was compared with their equilibrium bulk, non-dispersed counterparts, i.e. inverse nonlamellar liquid crystalline phases and micellar solutions under excess water conditions using synchrotron small angle X-ray scattering (SAXS) technique. In the applied pressure-range, induced phase transitions were solely observed in fully hydrated bulk samples; whereas the internal self-assemblies of the corresponding lipid nanoparticles displayed only pressuremodulated single phases. Interestingly both, the lattice parameters and linear pressure expansion coefficients were larger for the self-assemblies enveloped inside the lipid nanoparticles as compared to the bulk states. This can in part be attributed to enhanced lipid layer undulations in the lipid particles in addition to induced swelling effects in presence of the tri-block copolymer F127. The bicontinuous cubic phases in both bulk state and inside lipid cubosome nanoparticles swell on compression, even so both keep swelling further on decompression at relatively high pressures before shrinking again at ambient pressures.Pressure dependence of the phases is also modulated by the concentration of the solubilized oil (tetradecane). These studies demonstrate the tolerance of lipid nanoparticles (cubosomes, hexosomes, micellar cubosomes, and emulsified microemulsions (EMEs)) for high pressures proving their robustness for various technological applications.3

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Phase Behavior in the System Pine Needle Oil Monoglycerides-Poloxamer 407-Water at 20.degree.

Cited by 219 publications

References 22 publications

Formation of Cubic-Phase Microemulsions with Anionic and Cationic Surfactants at Equal Amounts of Oil and Water

Formation of Cubic-Phase Microemulsions with Anionic and Cationic Surfactants at Equal Amounts of Oil and Water

Parametrization of triply periodic minimal surfaces. III. General algorithm and specific examples for the irregular class

Effects of High Pressure on Internally Self-Assembled Lipid Nanoparticles: A Synchrotron Small-Angle X-ray Scattering (SAXS) Study

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