Modulation of metallic oxide particle behaviour in a formulation: physicochemical and/or sensory properties of emulsions as a tool to identify particles interactions within the matrix

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Modulation of metallic oxide particle behaviour in a formulation: physicochemical and/or sensory properties

of emulsions as a tool to identify particles interactions within the matrix

Daria Terescenco, Géraldine Savary, Nicolas Hucher, Celine Picard

To cite this version:

Daria Terescenco, Géraldine Savary, Nicolas Hucher, Celine Picard. Modulation of metallic oxide particle behaviour in a formulation: physicochemical and/or sensory properties of emulsions as a tool to identify particles interactions within the matrix. 32nd Conference of The European Colloid and Interface Society (ECIS2018), Sep 2018, Ljubljana, Slovenia. �hal-02468429�

Modulation of metal oxide particle behavior in a formulation: Modulation of metal oxide particle behavior in a formulation:

Modulation of metal oxide particle behavior in a formulation:

physicochemical and sensory properties of emulsion as a tool to identify particles interaction within the matrix physicochemical and sensory properties of emulsion as a tool to identify particles interaction within the matrix physicochemical and sensory properties of emulsion as a tool to identify particles interaction within the matrix

Terescenco Daria^a, Savary Géraldine^a, Hucher Nicolas^a, Picard Céline^a

[a] Normandie Univ, UNILEHAVRE, FR 3038 CNRS, URCOM, 76600 Le Havre, France

The aim of this study lays on the fundamental approach in the understanding of the behavior of the systems containing solid particles

Conclusion

This study showed that emulsions stabilized with solid particles :

 Can be of oil on water or water in oil type, depending on the particle properties (hydrophilic or lipophilic);

 Possess specific thermal behavior, due to the particle strong adhesion on the droplet surface;

 Show individual macroscopic response and sensory perception, governed not only by the emulsion type, but also by the particles individual properties.

1 Binks, B. P. Particles as surfactants—similarities and differences. Current Opinion in Colloid & Interface Science 7, 21–41 (2002).

Emulsification

10%

particles Water

Carpylic capric triglycerides

SiO2 TiOTiO 22

C16H35O4P

C₂₀H₄₂O

ZnOZnO ^C22H46O

C₂₀H₄₀O₂

C₂₂H₄₄O₂

Zinc Oxide, Jojoba Esters Titanium Dioxide, Silica, Cetyl Phosphate

EM_TiO

O/W

Microscopic scaleMicroscopic scale Microscopic scale

 Particles promoted the emulsion formation through the stabilization of the oil/water droplets inside the matrix

 Droplets visual aspect is influenced by the particle type Volume distribution

Median = 15 µm

100 µm

O/W spherical droplets Particles agglomeration

100 µm

W/O spherical droplets and distorted droplets

Particles covering the water droplets

Macroscopic scale Macroscopic scale Macroscopic scale

Oscillatory rheology Resistance to the

deformation

Rapid emulsions destruction

Plateau

G’=G’’

EM_TiO2

Plateau

G’=G’’

EM_ZnO

Flexible structure Short G’ plateau - immediate response of the product to the

increasing deformation

EM_TiOEM_TiOEM_TiO₂₂₂

No residue Glossy appearance

White cream High integrity

High compression force

Medium

whitening effect Crispy touch

Long spreading

EM_ZnOEM_ZnO EM_ZnO

Medium integrity Low resistance

Oily touch

Low whitening effect

Easy spreading

Sensory perception Sensory perception Sensory perception

EM_ZnO W/O

Volume distribution Median = 30 µm

Two metallic oxides were selected depending on their different physicochemical properties and introduced in a formulation. Then, stable, homogeneous and totally emulsified systems, never discussed in the literature before, were described through a fundamental, multiscale characterization. Rheological, thermal and sensory behavior, as well as emulsion colloid size and size distribution, were used as a tool to identify the role of the particles on the matrix organization.

The chosen particle type clearly impacted the properties of the system at microscopic and macroscopic level. This impact should be taken into account when discussing classical emulsions containing particles in their composition. The next step of this work will be to complete the studied range of particles with other metal oxides to achieve the fundamental understanding of the particles role in the matrix.

Oil Water

θ > 90°

Hydrophobic particle¹

O W

Water

Oil

θ < 90°

Hydrophilic particle¹ O

W

Thermal response Thermal response Thermal response

Thermogravimetric analysis

W/O ZnO emulsion

water retained as internal phase O/W TiO² emulsion

water free evaporation

(continuous phase)

Droplet destruction =

water evaporation

W/O ZnO emulsion oil free release

Droplet destruction =

oil instant release

Water freezing -15°C

Oil freezing -21°C

Oil + water freezing

-23°C

Differential scanning calorimetry

W/O ZnO emulsion:

Internal water phase inaccessible = common water/oil freezing peak

Water fusion Oil fusion