Modifying interfacial interparticle forces to alter microstructure and viscoelasticity of densely packed particle laden interfaces

Syed Ehsanur Rahman, Nader Laal-Dehghani, Sourav Barman, Gordon F. Christopher

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Hypothesis: It is possible to control the absolute and relative magnitude of repulsive and attractive interactions and hence microstructure of interfacial particles at and air/water interface by adjusting subphase composition. It should be possible to modify interfacial viscoelasticity from elastic to viscous behavior through these changes to interfacial microstructure. Experiments: Particle laden interfaces are made from micron sized polystyrene at an air/water interface. The inter-particle interactions are controlled by the subphase salt concentration and addition of both non-ionic and ionic surfactants. These interfaces are then characterized using an interfacial rheometer with a custom visualization system. Findings: Three distinct microstructures are observed. Low repulsion and high attraction systems exhibit a soft glassy rheology with a disordered but dense microstructure. Creating high repulsion results in a dense hexagonal crystal. Finally, in systems with reduced repulsion and attraction, a hexatic phase can be observed. Each of these microstructures exhibit unique interfacial viscoelastic behavior. These results indicate that control over the properties of these interfaces, and hence Pickering emulsions, is possible through manipulation of interparticle forces.

Original languageEnglish (US)
Pages (from-to)30-41
Number of pages12
JournalJournal of Colloid And Interface Science
Volume536
DOIs
StatePublished - Feb 15 2019

Fingerprint

Viscoelasticity
Microstructure
Particle interactions
Water
Polystyrenes
Rheometers
Air
Emulsions
Rheology
Surface-Active Agents
Surface active agents
Visualization
Salts
Crystals
Chemical analysis
Experiments

Keywords

  • Colloids
  • Interfacial rheology
  • Particle laden interfaces
  • Particle surfactant systems
  • Pickering emulsion

PubMed: MeSH publication types

  • Journal Article

Cite this

Modifying interfacial interparticle forces to alter microstructure and viscoelasticity of densely packed particle laden interfaces. / Rahman, Syed Ehsanur; Laal-Dehghani, Nader; Barman, Sourav; Christopher, Gordon F.

In: Journal of Colloid And Interface Science, Vol. 536, 15.02.2019, p. 30-41.

Research output: Contribution to journalArticle

@article{81450d3e2c444c2cb204df2398b4050b,
title = "Modifying interfacial interparticle forces to alter microstructure and viscoelasticity of densely packed particle laden interfaces",
abstract = "Hypothesis: It is possible to control the absolute and relative magnitude of repulsive and attractive interactions and hence microstructure of interfacial particles at and air/water interface by adjusting subphase composition. It should be possible to modify interfacial viscoelasticity from elastic to viscous behavior through these changes to interfacial microstructure. Experiments: Particle laden interfaces are made from micron sized polystyrene at an air/water interface. The inter-particle interactions are controlled by the subphase salt concentration and addition of both non-ionic and ionic surfactants. These interfaces are then characterized using an interfacial rheometer with a custom visualization system. Findings: Three distinct microstructures are observed. Low repulsion and high attraction systems exhibit a soft glassy rheology with a disordered but dense microstructure. Creating high repulsion results in a dense hexagonal crystal. Finally, in systems with reduced repulsion and attraction, a hexatic phase can be observed. Each of these microstructures exhibit unique interfacial viscoelastic behavior. These results indicate that control over the properties of these interfaces, and hence Pickering emulsions, is possible through manipulation of interparticle forces.",
keywords = "Colloids, Interfacial rheology, Particle laden interfaces, Particle surfactant systems, Pickering emulsion",
author = "Rahman, {Syed Ehsanur} and Nader Laal-Dehghani and Sourav Barman and Christopher, {Gordon F.}",
year = "2019",
month = "2",
day = "15",
doi = "10.1016/j.jcis.2018.10.028",
language = "English (US)",
volume = "536",
pages = "30--41",
journal = "Journal of Colloid and Interface Science",
issn = "0021-9797",
publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - Modifying interfacial interparticle forces to alter microstructure and viscoelasticity of densely packed particle laden interfaces

AU - Rahman, Syed Ehsanur

AU - Laal-Dehghani, Nader

AU - Barman, Sourav

AU - Christopher, Gordon F.

PY - 2019/2/15

Y1 - 2019/2/15

N2 - Hypothesis: It is possible to control the absolute and relative magnitude of repulsive and attractive interactions and hence microstructure of interfacial particles at and air/water interface by adjusting subphase composition. It should be possible to modify interfacial viscoelasticity from elastic to viscous behavior through these changes to interfacial microstructure. Experiments: Particle laden interfaces are made from micron sized polystyrene at an air/water interface. The inter-particle interactions are controlled by the subphase salt concentration and addition of both non-ionic and ionic surfactants. These interfaces are then characterized using an interfacial rheometer with a custom visualization system. Findings: Three distinct microstructures are observed. Low repulsion and high attraction systems exhibit a soft glassy rheology with a disordered but dense microstructure. Creating high repulsion results in a dense hexagonal crystal. Finally, in systems with reduced repulsion and attraction, a hexatic phase can be observed. Each of these microstructures exhibit unique interfacial viscoelastic behavior. These results indicate that control over the properties of these interfaces, and hence Pickering emulsions, is possible through manipulation of interparticle forces.

AB - Hypothesis: It is possible to control the absolute and relative magnitude of repulsive and attractive interactions and hence microstructure of interfacial particles at and air/water interface by adjusting subphase composition. It should be possible to modify interfacial viscoelasticity from elastic to viscous behavior through these changes to interfacial microstructure. Experiments: Particle laden interfaces are made from micron sized polystyrene at an air/water interface. The inter-particle interactions are controlled by the subphase salt concentration and addition of both non-ionic and ionic surfactants. These interfaces are then characterized using an interfacial rheometer with a custom visualization system. Findings: Three distinct microstructures are observed. Low repulsion and high attraction systems exhibit a soft glassy rheology with a disordered but dense microstructure. Creating high repulsion results in a dense hexagonal crystal. Finally, in systems with reduced repulsion and attraction, a hexatic phase can be observed. Each of these microstructures exhibit unique interfacial viscoelastic behavior. These results indicate that control over the properties of these interfaces, and hence Pickering emulsions, is possible through manipulation of interparticle forces.

KW - Colloids

KW - Interfacial rheology

KW - Particle laden interfaces

KW - Particle surfactant systems

KW - Pickering emulsion

UR - http://www.scopus.com/inward/record.url?scp=85054824112&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85054824112&partnerID=8YFLogxK

U2 - 10.1016/j.jcis.2018.10.028

DO - 10.1016/j.jcis.2018.10.028

M3 - Article

C2 - 30342409

AN - SCOPUS:85054824112

VL - 536

SP - 30

EP - 41

JO - Journal of Colloid and Interface Science

JF - Journal of Colloid and Interface Science

SN - 0021-9797

ER -