Rotator phases in hexadecane emulsion drops revealed by X-ray synchrotron techniques.

  title={Rotator phases in hexadecane emulsion drops revealed by X-ray synchrotron techniques.},
  author={Diana Cholakova and Desislava Glushkova and Zhulieta Valkova and Sonya Tsibranska-Gyoreva and Krastina Tsvetkova and Slavka S. Tcholakova and Nikolai Denkov},
  journal={Journal of colloid and interface science},



Observation of the transient rotator phase of n-hexadecane in emulsified droplets with time-resolved two-dimensional small- and wide-angle X-ray scattering.

It is suggested that the rotator phase at the interface of oil and water plays a precursor role for bulk crystallization, which is important for the study of crystallization of soft materials.

On the Mechanism of Drop Self-Shaping in Cooled Emulsions.

The temperature dependence of the interfacial tensions of several systems undergoing drop-shape transitions are measured to unambiguously show that drop self-shaping is not related to ultralow oil-water interfacial tension, as proposed by Guttmann et al.

Crystallization behaviors of n-octadecane in confined space: crossover of rotator phase from transient to metastable induced by surface freezing.

The main discovery is that the microencapsulated n-octadecane crystallizes into a stable triclinic phase via a mestastable rotator phase (R I), which emerges as a transient state for the bulk n- octadeCane and is difficult to be detected by the commonly used characterization methods.

"Self-Shaping" of Multicomponent Drops.

A systematic study of the ability of multicomponent emulsion drops to deform upon cooling and three recently reported mechanisms of self-emulsification are observed; a new mechanism is observed upon freezing for alkane mixtures with Δn > 4.

Temperature-Tuned Faceting and Shape Changes in Liquid Alkane Droplets.

Temperature-dependent γ(T), optical microscopy measurements, and interfacial entropy determinations for several alkane/surfactant combinations provide strong quantitative support validating the crystalline monolayer buckling mechanism.

Control of drop shape transformations in cooled emulsions.

Microbeam X-ray Diffraction Analysis of Interfacial Heterogeneous Nucleation of n-Hexadecane inside Oil-in-Water Emulsion Droplets

We have carried out X-ray microbeam analysis of the crystallization behavior of n-hexadecane (C16) in oil-in-water emulsion droplets that were formed using surfactants with different types of

Multilayer Formation in Self-Shaping Emulsion Droplets.

New results are presented, obtained by differential scanning calorimetry (DSC), which quantify the enthalpy effects accompanying the drop-shape transformations and provide the basis for a rational approach to the mechanistic explanation and to the fine control of this fascinating and industrially relevant phenomenon.

Self-shaping of oil droplets via the formation of intermediate rotator phases upon cooling

This work shows that by using appropriate cooling protocols, it can be harnessed to control the deformation of liquid hydrocarbon droplets and then freeze them into solid particles, permanently preserving their shape.