Structural and Thermal Properties of Unpurified and Purified 12-Hydroxystearic Acid Solutions

Takeno, H.; Maehara, Akiko; Kuchiishi, Masami; Yoshiba, Kazuto; Takeshita, Hiroki; Kondo, Shingo; Dobashi, Toshiaki; Takenaka, Mikihito; Hasegawa, Hirokazu

doi:10.2115/fiber.68.248

Cited by 8 publications

(9 citation statements)

References 17 publications

(24 reference statements)

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“…From the fittings, the average radius,

, and the size distributions of

values (graphs insets in Figure 5 and Figure 6 ) were obtained. For the 12HSA organogels,

was approximately 10 nm, in agreement with the value reported for 12HSA gel in toluene [ 45 ], whereas for the CW materials,

was approximately 4 nm. This difference in

might be directly associated to the differences observed in the polarized microscopy results.…”

Section: Resultssupporting

confidence: 88%

“…Regarding the size distributions, they were positively skewed, i.e., the distributions had more data on the right tail. A dispersion of

values around 30% was found in all cases, which was ~1.5 times higher than the value found for 12HSA gel in toluene [ 45 ], likely related to the presence of sunflower oil. To the best of our knowledge, there is no reference value for CW organogels, and this is the first time that this kind of SAXS analysis is applied to this material.…”

Section: Resultsmentioning

confidence: 64%

“…Under the hypothesis, the cylinders are sufficiently long (

), used in previous works [ 45 ]. Equation (2) can be approximated as a product of the longitudinal factor,

, parallel to the cylinder axis, and the scattering cross-section function,

[ 47 ]:

where

…”

Section: Resultsmentioning

confidence: 99%

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Influence of the Mixtures of Vegetable Oil and Vitamin E over the Microstructure and Rheology of Organogels

Martinez

Filho

Gerbelli

et al. 2022

Gels

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Candelilla wax (CW) and 12-hydroxystearic acid (12HSA) are classic solid-fiber-matrix organogelators. Despite the high number of studies using those ingredients in oily systems, there is scarce literature using a mixture of oil and antioxidants. Vitamin E (VE) is an important candidate for its lipophilicity and several applications on pharmaceutical, cosmetics, and food industries. In this work, we investigated the influences of mixtures between vegetable oil (VO) and VE on the microstructures and rheological properties of CW and 12HSA organogels. A weak gel (G′′/G′ > 0.1) with a shear-thinning behavior was observed for all samples. The presence of VE impacted the gel strength and the phase transition temperatures in a dose-dependent pattern. Larger and denser packed crystals were seen for 12HSA samples, while smaller and more dispersed structures were obtained for CW organogels. The results obtained in this work allowed the correlation of the structural and mechanical properties of the organogels, which plays an important role in the physical-chemical characteristics of these materials.

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“…From the fittings, the average radius,

, and the size distributions of

values (graphs insets in Figure 5 and Figure 6 ) were obtained. For the 12HSA organogels,

was approximately 10 nm, in agreement with the value reported for 12HSA gel in toluene [ 45 ], whereas for the CW materials,

was approximately 4 nm. This difference in

might be directly associated to the differences observed in the polarized microscopy results.…”

Section: Resultssupporting

confidence: 88%

“…Regarding the size distributions, they were positively skewed, i.e., the distributions had more data on the right tail. A dispersion of

Section: Resultsmentioning

confidence: 64%

See 1 more Smart Citation

Influence of the Mixtures of Vegetable Oil and Vitamin E over the Microstructure and Rheology of Organogels

Martinez

Filho

Gerbelli

et al. 2022

Gels

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“…The sol-gel transition temperatures for 12-HSA/F5 gel increased with the increase of the gelator concentrations as well as other organogels [5,18]. The sol-gel transition temperatures are near to the melting point of 12-HSA powder (80.9°C [18]), e.g., in the case of 3 wt% 12-HSA/F5 gel, it was 78.3°C.…”

Section: Resultsmentioning

confidence: 89%

“…The sol-gel transition temperatures are near to the melting point of 12-HSA powder (80.9°C [18]), e.g., in the case of 3 wt% 12-HSA/F5 gel, it was 78.3°C. Above the transition temperature, the mixture becomes a homogeneous solution [19].…”

Section: Resultsmentioning

confidence: 99%

Relationship between helical aggregates and polymorphs in a 12-hydroxystearic acid gel: their thermal stability and formation kinetics

et al. 2014

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Structures of 12-hydroxystearic acid (12-HSA)/ phenyl methyl silicone gel and the gelation process were investigated by means of synchrotron small-angle X-ray scattering (SAXS), wide-angle X-ray scattering (WAXS), and polarized optical microscopy (POM). Spherulite structures were formed at low temperatures, while helical aggregates without branching were observed at high temperatures. The morphological transformation from spherulites into helical aggregates occurred during a heating process but not vice versa. Combined synchrotron SAXS and POM studies reveal that the morphological transformation is associated with polymorphs of 12-HSA crystal. Thermal stability and formation kinetics of the aggregates and the polymorphs are discussed in the text.

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Synchrotron Small-Angle X-Ray Scattering and Small-Angle Neutron Scattering Studies of Nanomaterials

Takeno

2016

X-Ray and Neutron Techniques for Nanomaterials Characterization

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Structural and Thermal Properties of Unpurified and Purified 12-Hydroxystearic Acid Solutions

Cited by 8 publications

References 17 publications

Influence of the Mixtures of Vegetable Oil and Vitamin E over the Microstructure and Rheology of Organogels

Influence of the Mixtures of Vegetable Oil and Vitamin E over the Microstructure and Rheology of Organogels

Relationship between helical aggregates and polymorphs in a 12-hydroxystearic acid gel: their thermal stability and formation kinetics

Synchrotron Small-Angle X-Ray Scattering and Small-Angle Neutron Scattering Studies of Nanomaterials

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