Characterizing the rheology, slip, and velocity profiles of lamellar gel networks

Anukta, Datta,; Tanmay, Velidanda S.; Tan, Grace; Reynolds, Geoffrey W.; Jamadagni, Sumanth N.; Larson, Ronald G.

doi:10.1122/8.0000011

Cited by 21 publications

(16 citation statements)

References 49 publications

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“…So, an increase in mixing speed from 2000 rpm to 3500 rpm could lead to a breakdown of the gel network and hence lower deposition of conditioning molecules. Datta et al reported that a ternary lamellar gel system of behentrimonium methosulfate and fatty alcohol experience high shear thinning as a result of ramps in shear rate but was able to heal and recover its original viscosity after 12 h [72]. In this study, the conditioning tests were conducted between 24-72 h after processing, a period long enough to enable shear recovery.…”

Section: Effects Of Shear Mixing Speed On Formulation Performancementioning

confidence: 96%

“…This gel network forms when the mixed emulsifiers in excess of what is required to form a monomolecular film at the oil-water interface, interacts with the continuous aqueous phase [70,71]. Typically, this causes the system to be highly viscous with high yield stress values [72].…”

Section: Rheological Profilingmentioning

confidence: 99%

“…Further work has been done to characterize the rheological profiles of emulsions formulated using a mix of fatty alcohols and conventional surfactants [57,72,76,77]. However, research studying the effects of processing conditions on the rheology of amino acid amphiphile based emulsions are limited.…”

Section: Rheological Profilingmentioning

confidence: 99%

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Impact of Processing Conditions on Rheology, Tribology and Wet Lubrication Performance of a Novel Amino Lipid Hair Conditioner

2021

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The objective of this work was to carry out a comprehensive evaluation of the performance of a novel cationic amino lipid surfactant, Brassicyl Valinate Esylate (BVE), in contrast to conventional alkyl quaternary ammonium surfactants (quats), through a study of the effects of process mixing speed on its overall rheological, tribological and wet lubrication performance in comparison to BTAC and CTAC, two cationic surfactants widely used in cosmetics. The major cosmetic application of cationic surfactants is in the preparation of hair conditioners. Hence, this analysis was done firstly by conducting tensile combing tests to evaluate reduction in wet lubrication which translates to conditioning performance. The combing results serve as a testing metric that adequately corresponds to consumer perception of conditioned hair. To correlate this technically, yield stress measurements were conducted to establish rheologic profiles of the conditioner formulations, and in vitro tribological testing of the emulsion systems between two steel surfaces were done to technically simulate the spreading and rubbing of conditioner on the hair. The effect of processing conditions on the formulations was then evaluated. BVE was found to be an effective conditioning surfactant suitable as an eco-friendly replacement for BTAC and CTAC in hair conditioner formulations. The results showed that higher shear mixing rates during formulation lead to poorer performance effects evident through decreased yield stress values, lower percentage reduction in combing force and a higher coefficient of friction.

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Section: Effects Of Shear Mixing Speed On Formulation Performancementioning

confidence: 96%

Section: Rheological Profilingmentioning

confidence: 99%

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Impact of Processing Conditions on Rheology, Tribology and Wet Lubrication Performance of a Novel Amino Lipid Hair Conditioner

2021

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“…Other examples of rate sweeps to low values of shear rate have been reported. [26][27][28][29][30] Strain (stress) sweeps are very popular and provide important information concerning the extent of the linear range of viscoelastic response and the region of stress where large-angle response can be found. [31] As suggested already, most strain sweeps are run at a high frequency, typically 1 Hz (6.28 rad/s), and thus take very little time.…”

Section: Application To Other Sweepsmentioning

confidence: 99%

Polymer melt rheology: Advantages of frequency sweeps using randomly selected frequencies*

Shaw

2021

Polymer Engineering & Sci

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Measurement of the viscoelastic properties of polymer solids, melts, and solutions is broadly practiced. The so‐called “frequency sweep” appears in thousands of publications, with data covering up to five decades of frequency to reveal, for example, the relative molecular size of a polymer. To perform these experiments, the frequency range is typically “swept” from high to low frequency or vice versa. Unfortunately, this confounds frequency with run time. This is more than annoying; time effects can result in serious mistakes in the interpretation of the data. Fortunately, the confounding can be eliminated by simply running the frequencies in random order, which converts the time trend to random error. Described here is how this can be done and shows via modeling that the result can not only show that time effects are present but can be analyzed to show the time rate of change of the sample. This analysis is demonstrated using two real examples: loss of solvent from poly(dimethyl siloxane) gum and gelation of porcine gelatin. This method compares well with the multiwave technique, but does not require any special software or adjustments of amplitude with frequency or harmonic spacing of the frequencies.

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“…It is presently used as the dispersed phase for Vit C, allowing its dissolution and stabilization. A specific structure known as -gel is of particular interest in cosmetic skin care because of its soft touch [Okamoto et al, 2016;Datta et al, 2020]. Its basic ingredients are a fatty alcohol, namely cetyl and stearyl alcohols and their mixtures, and a surfactant that self-assembles as bilayers in association with the fatty alcohols.…”

Section: Introductionmentioning

confidence: 99%

Stabilization of vitamin C in emulsions of liquid crystalline structures

Caritá

Azevedo

Buri

et al. 2021

International Journal of Pharmaceutics

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Characterizing the rheology, slip, and velocity profiles of lamellar gel networks

Cited by 21 publications

References 49 publications

Impact of Processing Conditions on Rheology, Tribology and Wet Lubrication Performance of a Novel Amino Lipid Hair Conditioner

Impact of Processing Conditions on Rheology, Tribology and Wet Lubrication Performance of a Novel Amino Lipid Hair Conditioner

Polymer melt rheology: Advantages of frequency sweeps using randomly selected frequencies*

Stabilization of vitamin C in emulsions of liquid crystalline structures

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