Title : Tuning particle–particle interactions to control Pickering emulsions constituents separation. Suppléments

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Titre:

Title : Tuning particle–particle interactions to control Pickering emulsions constituents separation. Suppléments

Auteurs:

Authors : Faezeh Sabri, Kevin Berthomier, Chang-Sheng Wang, Louis Fradette, Jason Robert Tavares et Nick Virgilio

Date: 2019

Type: Article de revue / Journal article

Référence:

Citation :

Sabri, F., Berthomier, K., Wang, C.-S., Fradette, L., Tavares, J. R. & Virgilio, N.

(2019). Tuning particle–particle interactions to control Pickering emulsions constituents separation. Suppléments. Green Chemistry, 21(5), p. 1065-1074.

doi:10.1039/c8gc03007c

Document en libre accès dans PolyPublie

Open Access document in PolyPublie

URL de PolyPublie:

PolyPublie URL:

https://publications.polymtl.ca/5335/

Version: Matériel supplémentaire / Supplementary material Révisé par les pairs / Refereed

Conditions d’utilisation:

Terms of Use

: Tous droits réservés / All rights reserved

Document publié chez l’éditeur officiel Document issued by the official publisher

Titre de la revue:

Journal Title:

Green Chemistry (vol. 21, no 5) Maison d’édition:

Publisher:

Royal Society of Chemistry URL officiel:

Official URL:

https://doi.org/10.1039/c8gc03007c Mention légale:

Legal notice:

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1

Supporting Information

Tuning Particle-Particle Interactions to Control Pickering Emulsions Constituents Separation

Faezeh Sabri, Kevin Berthomier, Chang-Sheng Wang, Louis Fradette, Jason R. Tavares and Nick Virgilio*

a

Research Center for High Performance Polymer and Composite Systems (CREPEC), Department of Chemical Engineering, Polytechnique Montréal, Montréal, Québec, H3C 3A7,

Canada Electronic Supplementary Material (ESI) for Green Chemistry.

This journal is © The Royal Society of Chemistry 2019

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2 Before homogenizer processing After homogenizer processing

SP particles

SP-SA particles

Figure S1. SEM micrographs of SP and SP-SA particles before and after homogenizer processing.

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3 Figure S2. Pictures of concentrated oil-in-water Pickering emulsions comprising 4% SP-SA particles (ϕ

o

= 0.8) when contained into the plastic molds (a), removed from plastic molds (b, c), and under compressive stress (d, e).

a)

d) pH = 3.0

b) pH = 3.0 c) pH = 7.0

e) pH = 7.0

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4 ϕ

o

(pH = 3.0) ϕ

o

(pH = 7.0)

0.1 0.3 0.5 0.7 0.9 0.1 0.3 0.5 0.7 0.9

Figure S3. Effect of oil volume fraction ϕ

o

on emulsion aspect, with 4% (w/v) particles: a) and b), emulsions prepared with unmodified silica particles (SP) at pHs 3.0 and 7.0, respectively; c) and d), emulsions prepared with sodium alginate-modified particles (SP-SA), at pHs 3.0 and 7.0; e) emulsion composed of SP particles (4% w/v) at ϕ

o

= 0.8, compared to f) emulsion composed of SP-SA particles (4% w/v) at ϕ

o

= 0.8.

a) b)

c) d)

e) f)

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5 ϕ

o

SP (pH=3.0) 0.1 0.3 0.5

ϕ

o

SP-SA (pH=3.0) 0.1 0.3 0.5

Fresh samples

1 week

2 weeks

3 weeks

4 weeks

Figure S4. Emulsion stability in time at 3 different oil volume fractions ϕ

o

, and constant 4% (w/v)

particles.

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6 10 20 30 40 50 60 70

0 10 20 30 40 50 60

 O (%)

SP, pH = 3.0 SP, pH = 7.0 SP-SA, pH = 3.0 SP-SA, pH = 7.0

d ( μ m ) 

Figure S5. Number average diameter d of oil droplets as a function of oil volume fraction ϕ

o

, for

both SP and SP-SA particles, at pH 3.0 and 7.0, as obtained by laser diffraction (Mastersizer).

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7 0 50 100 150 200 250

0.00 0.02 0.04 0.86 0.88 0.90 0.92 0.94 0.96 0.98 1.00

pH = 3.0, stress = 193 Pa pH = 3.0, stress = 290 Pa pH = 3.0, stress = 387 Pa pH = 7.0, stress = 193 Pa

h (t ) /h 0

t (min)

Figure S6. Normalized height (h(t)/h

0

) with the error bars as a function of time t and applied

stress on molded concentrated emulsions (ϕ

o

= 0.8) comprising 4% SP or SP-SA particles,

at pH 3.0 and 7.0.

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8 pH=3.0

t(min)

pH=7.0 t(min) 0 3 6 9 12 15 60

0 3 6 9 12 15 60

Unmodified SP particles

Sodium alginate modified particles SP-SA

Figure S7. Pictures of the particle’s behavior during sedimentation in water (height of test tube = 15.3 cm) for SP (a, b) and SP-SA (c, d), over 60 min at pHs 3.0 and 7.0.

a)

c) d)

b)

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