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On the formation and stability of cellulose-based emulsions in alkaline systems : Effect of the solvent quality

Costa, Carolina ; Medronho, Bruno LU ; Filipe, Alexandra ; Romano, Anabela ; Lindman, Björn LU ; Edlund, Håkan and Norgren, Magnus LU (2022) In Carbohydrate Polymers 286.
Abstract

With amphiphilic properties, cellulose molecules are expected to adsorb at the O/W interface and be capable of stabilizing emulsions. The effect of solvent quality on the formation and stability of cellulose-based O/W emulsions was evaluated in different alkaline systems: NaOH, NaOH-urea and tetrabutylammonium hydroxide (TBAH). The optimal solvency conditions for cellulose adsorption at the O/W interface were found for the alkaline solvent with an intermediate polarity (NaOH-urea), which is in line with the favorable conditions for adsorption of an amphiphilic polymer. A very good solvency (in TBAH) and the interfacial activity of the cation lead to lack of stability because of low cellulose adsorption. However, to achieve long-term... (More)

With amphiphilic properties, cellulose molecules are expected to adsorb at the O/W interface and be capable of stabilizing emulsions. The effect of solvent quality on the formation and stability of cellulose-based O/W emulsions was evaluated in different alkaline systems: NaOH, NaOH-urea and tetrabutylammonium hydroxide (TBAH). The optimal solvency conditions for cellulose adsorption at the O/W interface were found for the alkaline solvent with an intermediate polarity (NaOH-urea), which is in line with the favorable conditions for adsorption of an amphiphilic polymer. A very good solvency (in TBAH) and the interfacial activity of the cation lead to lack of stability because of low cellulose adsorption. However, to achieve long-term stability and prevent oil separation in NaOH-urea systems, further reduction in cellulose's solvency was needed, which was achieved by a change in the pH of the emulsions, inducing the regeneration of cellulose at the surface of the oil droplets (in-situ regeneration).

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Amphiphilicity, Dissolution, NaOH, O/W emulsions, Regenerated cellulose, TBAH, Urea
in
Carbohydrate Polymers
volume
286
article number
119257
publisher
Elsevier
external identifiers
  • scopus:85125363749
  • pmid:35337494
ISSN
0144-8617
DOI
10.1016/j.carbpol.2022.119257
language
English
LU publication?
yes
id
1585744b-1554-432a-8dcb-df6e5dbc8668
date added to LUP
2022-06-02 11:06:58
date last changed
2025-03-21 20:34:52
@article{1585744b-1554-432a-8dcb-df6e5dbc8668,
  abstract     = {{<p>With amphiphilic properties, cellulose molecules are expected to adsorb at the O/W interface and be capable of stabilizing emulsions. The effect of solvent quality on the formation and stability of cellulose-based O/W emulsions was evaluated in different alkaline systems: NaOH, NaOH-urea and tetrabutylammonium hydroxide (TBAH). The optimal solvency conditions for cellulose adsorption at the O/W interface were found for the alkaline solvent with an intermediate polarity (NaOH-urea), which is in line with the favorable conditions for adsorption of an amphiphilic polymer. A very good solvency (in TBAH) and the interfacial activity of the cation lead to lack of stability because of low cellulose adsorption. However, to achieve long-term stability and prevent oil separation in NaOH-urea systems, further reduction in cellulose's solvency was needed, which was achieved by a change in the pH of the emulsions, inducing the regeneration of cellulose at the surface of the oil droplets (in-situ regeneration).</p>}},
  author       = {{Costa, Carolina and Medronho, Bruno and Filipe, Alexandra and Romano, Anabela and Lindman, Björn and Edlund, Håkan and Norgren, Magnus}},
  issn         = {{0144-8617}},
  keywords     = {{Amphiphilicity; Dissolution; NaOH; O/W emulsions; Regenerated cellulose; TBAH; Urea}},
  language     = {{eng}},
  month        = {{06}},
  publisher    = {{Elsevier}},
  series       = {{Carbohydrate Polymers}},
  title        = {{On the formation and stability of cellulose-based emulsions in alkaline systems : Effect of the solvent quality}},
  url          = {{http://dx.doi.org/10.1016/j.carbpol.2022.119257}},
  doi          = {{10.1016/j.carbpol.2022.119257}},
  volume       = {{286}},
  year         = {{2022}},
}