Ultrafine emulsions and application to cosmetics.

Nakajima, Hideo; Tomomasa, Satoshi; Kouchi, Miyuki

doi:10.5107/sccj.23.288

Cited by 12 publications

(6 citation statements)

References 1 publication

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“…For the stepwise aggregation mechanism the nucleation and growth rates should depend strongly on the oil solubility in water and therefore on the oil chain length. Such a strong oil chain length dependence was indeed observed by Nakajima, , in similar quench experiments to ours. Taisne and Cabane, on the other hand, observed no significant difference between tetradecane and hexadecane systems, when following the evolution of the small angle neutron scattering after quenching from very high temperatures.…”

Section: Comparison With Experimentssupporting

confidence: 90%

Homogeneous Nucleation in an Emulsion/Droplet Microemulsion System

1997

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We present a theoretical analysis of a model nucleation process where an oil phase separates out from a droplet microemulsion phase. We consider a homogeneous nucleation where aggregate growth occurs through addition of monomers. The nucleus is formed by the growth of an already existing microemulsion droplet. On the basis of previous equilibrium studies of the microemulsions of the same system we can be confident about the accuracy of the description of free energy changes during nucleation. Using the constraints of constant hydrocarbon volume and aggregate area, the change in curvature free energy is determined as an oil drop is nucleated rather than the change in surface free energy, as in a conventional nucleation theory. We obtain a simple analytical expression for the barrier which has the feature that it only exists in a finite parameter range. In the particular system that we have studied experimentally a two-phase system of microemulsion plus excess oil is reached through a temperature quench and a nucleation barrier is found for moderately deep quenches only. Having established an expression for the nucleation barrier, we analyze the kinetics and derive a diffusion equation in aggregate space, which considerably facilitates the calculation of the steady state rate for the formation of nuclei. Experiments confirm the existence of a nucleation barrier in the predicted range. They also show the concentration independence of the barrier and that experiments with different initial radii can be put on a common scale, as predicted. It is concluded that the system is very promising for fundamental studies of the dynamics of nucleation processes in liquids.

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Section: Comparison With Experimentssupporting

confidence: 90%

Homogeneous Nucleation in an Emulsion/Droplet Microemulsion System

1997

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“…They are used in cosmetics as personal-care formulations [8][9][10], in agrochemicals for pesticide delivery [11,12], in the chemical industry for the preparation of latex particles [13][14][15], etc. Nano-emulsions are often referred to in the literature as miniemulsions [16,17], submicrometer-sized emulsions [18], ultrafine emulsions [19], etc.…”

Section: Introductionmentioning

confidence: 99%

Formation of water-in-oil (W/O) nano-emulsions in a water/mixed non-ionic surfactant/oil systems prepared by a low-energy emulsification method

Uson

García

Solans

2004

Colloids and Surfaces A: Physicochemical and Engineering Aspect

155

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“…Liquid Crystals -Recent Advancements in Fundamental and Device Technologies methods such as the phase inversion temperature (PIT) method [15], D-phase emulsification [16], quenching method [17], and liquid crystal (LC) emulsification [18], which are attributed to stability at the oil-water interface accumulated by surfactant molecules or self-assemblies.…”

Section: Liquid Crystal Emulsificationmentioning

confidence: 99%

Recent Dispersion Technology Using Liquid Crystal

Yamashita¹

2018

Liquid Crystals - Recent Advancements in Fundamental and Device Technologies

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Lyotropic liquid crystals have prospective potentials for several industrial applications and also being a key technology in terms of the quality assurance of a product, drug carrier, as well as interpretation of biological phenomena. This chapter will provide the recent topics on several applications of liquid crystals in the cosmetic and pharmaceutical fields and review how to generate the lyotropic liquid crystals in the amphiphilic material system on the basis of the phase behavior and why the liquid crystal structure can impact the respective application.

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Ultrafine emulsions and application to cosmetics.

Cited by 12 publications

References 1 publication

Homogeneous Nucleation in an Emulsion/Droplet Microemulsion System

Homogeneous Nucleation in an Emulsion/Droplet Microemulsion System

Formation of water-in-oil (W/O) nano-emulsions in a water/mixed non-ionic surfactant/oil systems prepared by a low-energy emulsification method

Recent Dispersion Technology Using Liquid Crystal

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