Rupture of granular rafts: effects of particle mobility and polydispersity

Carole Planchette, Elise Lorenceau, Anne-Laure Biance

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Reversible encapsulation of liquid materials is a technical challenge in many applications such as for the transport and controlled delivery of active ingredients. In contrast to most state-of-the-art processes, capillary adsorbed solid particles can achieve chemical-reaction-free encapsulation by forming dense rafts which isolate the liquid from its surroundings. While the production conditions of such capsules have been characterized, the control of the armor robustness remains poorly described and understood. In this paper, we probe the armor robustness via impacts of droplets on encapsulated materials. Thereby, we establish the mechanisms and conditions of armor rupture and derive models that predict the rupturing thresholds or probabilities. Using monodisperse sized particles and gradually increasing the impacting drop velocity, a sharp transition from sustained to coalescing drops is observed. On mobile rafts made of particles at the water/air interface, the velocity threshold increases with increasing particle diameter while an opposite trend is observed on immobile rafts made of particles trapped at a gelified interface. Two models based on particle pair and triplet interactions, respectively, quantitatively match the experiments. Assembling rafts with particles of two different sizes significantly smoothens the coalescence transition, regardless of particle mobility. Beyond apparent similarities, rationalizing the rupturing probability of mobile and immobile armor evidences very different sensitivity to heterogeneities. On immobile armor, drop coalescence remains random and thus well described by the statistical particle distribution while on mobile armor the ruptures are preferably localized at the non-percolated parts of the granular network.
Original languageEnglish
Pages (from-to)6419-6430
JournalSoft matter
Volume14
DOIs
Publication statusPublished - Aug 2018

Fingerprint

rafts
Armor
Polydispersity
armor
coalescing
rupturing
Coalescence
Encapsulation
Particles (particulate matter)
Liquids
Capsules
thresholds
trapped particles
Chemical reactions
capsules
liquids
assembling
ingredients
chemical reactions
delivery

Keywords

  • drop
  • membrane
  • particles
  • coalescence
  • rupture
  • impacts

Cite this

Rupture of granular rafts: effects of particle mobility and polydispersity. / Planchette, Carole; Lorenceau, Elise; Biance, Anne-Laure.

In: Soft matter, Vol. 14, 08.2018, p. 6419-6430 .

Research output: Contribution to journalArticleResearchpeer-review

Planchette, Carole ; Lorenceau, Elise ; Biance, Anne-Laure. / Rupture of granular rafts: effects of particle mobility and polydispersity. In: Soft matter. 2018 ; Vol. 14. pp. 6419-6430 .
@article{ad16265349f34fa0961df9f08376086a,
title = "Rupture of granular rafts: effects of particle mobility and polydispersity",
abstract = "Reversible encapsulation of liquid materials is a technical challenge in many applications such as for the transport and controlled delivery of active ingredients. In contrast to most state-of-the-art processes, capillary adsorbed solid particles can achieve chemical-reaction-free encapsulation by forming dense rafts which isolate the liquid from its surroundings. While the production conditions of such capsules have been characterized, the control of the armor robustness remains poorly described and understood. In this paper, we probe the armor robustness via impacts of droplets on encapsulated materials. Thereby, we establish the mechanisms and conditions of armor rupture and derive models that predict the rupturing thresholds or probabilities. Using monodisperse sized particles and gradually increasing the impacting drop velocity, a sharp transition from sustained to coalescing drops is observed. On mobile rafts made of particles at the water/air interface, the velocity threshold increases with increasing particle diameter while an opposite trend is observed on immobile rafts made of particles trapped at a gelified interface. Two models based on particle pair and triplet interactions, respectively, quantitatively match the experiments. Assembling rafts with particles of two different sizes significantly smoothens the coalescence transition, regardless of particle mobility. Beyond apparent similarities, rationalizing the rupturing probability of mobile and immobile armor evidences very different sensitivity to heterogeneities. On immobile armor, drop coalescence remains random and thus well described by the statistical particle distribution while on mobile armor the ruptures are preferably localized at the non-percolated parts of the granular network.",
keywords = "drop, membrane, particles, coalescence, rupture, impacts",
author = "Carole Planchette and Elise Lorenceau and Anne-Laure Biance",
year = "2018",
month = "8",
doi = "10.1039/C8SM00653A",
language = "English",
volume = "14",
pages = "6419--6430",
journal = "Soft matter",
issn = "1744-683X",
publisher = "Royal Society of Chemistry",

}

TY - JOUR

T1 - Rupture of granular rafts: effects of particle mobility and polydispersity

AU - Planchette, Carole

AU - Lorenceau, Elise

AU - Biance, Anne-Laure

PY - 2018/8

Y1 - 2018/8

N2 - Reversible encapsulation of liquid materials is a technical challenge in many applications such as for the transport and controlled delivery of active ingredients. In contrast to most state-of-the-art processes, capillary adsorbed solid particles can achieve chemical-reaction-free encapsulation by forming dense rafts which isolate the liquid from its surroundings. While the production conditions of such capsules have been characterized, the control of the armor robustness remains poorly described and understood. In this paper, we probe the armor robustness via impacts of droplets on encapsulated materials. Thereby, we establish the mechanisms and conditions of armor rupture and derive models that predict the rupturing thresholds or probabilities. Using monodisperse sized particles and gradually increasing the impacting drop velocity, a sharp transition from sustained to coalescing drops is observed. On mobile rafts made of particles at the water/air interface, the velocity threshold increases with increasing particle diameter while an opposite trend is observed on immobile rafts made of particles trapped at a gelified interface. Two models based on particle pair and triplet interactions, respectively, quantitatively match the experiments. Assembling rafts with particles of two different sizes significantly smoothens the coalescence transition, regardless of particle mobility. Beyond apparent similarities, rationalizing the rupturing probability of mobile and immobile armor evidences very different sensitivity to heterogeneities. On immobile armor, drop coalescence remains random and thus well described by the statistical particle distribution while on mobile armor the ruptures are preferably localized at the non-percolated parts of the granular network.

AB - Reversible encapsulation of liquid materials is a technical challenge in many applications such as for the transport and controlled delivery of active ingredients. In contrast to most state-of-the-art processes, capillary adsorbed solid particles can achieve chemical-reaction-free encapsulation by forming dense rafts which isolate the liquid from its surroundings. While the production conditions of such capsules have been characterized, the control of the armor robustness remains poorly described and understood. In this paper, we probe the armor robustness via impacts of droplets on encapsulated materials. Thereby, we establish the mechanisms and conditions of armor rupture and derive models that predict the rupturing thresholds or probabilities. Using monodisperse sized particles and gradually increasing the impacting drop velocity, a sharp transition from sustained to coalescing drops is observed. On mobile rafts made of particles at the water/air interface, the velocity threshold increases with increasing particle diameter while an opposite trend is observed on immobile rafts made of particles trapped at a gelified interface. Two models based on particle pair and triplet interactions, respectively, quantitatively match the experiments. Assembling rafts with particles of two different sizes significantly smoothens the coalescence transition, regardless of particle mobility. Beyond apparent similarities, rationalizing the rupturing probability of mobile and immobile armor evidences very different sensitivity to heterogeneities. On immobile armor, drop coalescence remains random and thus well described by the statistical particle distribution while on mobile armor the ruptures are preferably localized at the non-percolated parts of the granular network.

KW - drop

KW - membrane

KW - particles

KW - coalescence

KW - rupture

KW - impacts

UR - https://pubs.rsc.org/en/journals/journalissues/sm#!issueid=sm014031&type=current&issnprint=1744-683x

U2 - 10.1039/C8SM00653A

DO - 10.1039/C8SM00653A

M3 - Article

VL - 14

SP - 6419

EP - 6430

JO - Soft matter

JF - Soft matter

SN - 1744-683X

ER -