Effect of Immiscible Secondary Fluid on Particle Dynamics and Coffee Ring Characteristics during Suspension Drying
Particle motion and coffee ring patterns in water-borne suspensions of polystyrene (PS) particle added with small amounts of secondary hydrophobic decalin are investigated during the drying of the suspension droplets, mainly employing light scattering methods. Very tiny secondary fluid insertions vi...
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doaj-2dbb0c4b93a64772ba5ff5c07d0774412020-11-25T01:55:58ZengMDPI AGMaterials1996-19442020-08-01133438343810.3390/ma13153438Effect of Immiscible Secondary Fluid on Particle Dynamics and Coffee Ring Characteristics during Suspension DryingKevin Injoe Jung0Baek Sung Park1Seong Jae Lee2Seung Man Noh3Hyun Wook Jung4Department of Chemical and Biological Engineering, Korea University, Seoul 02841, KoreaDepartment of Chemical and Biological Engineering, Korea University, Seoul 02841, KoreaDepartment of Polymer Engineering, The University of Suwon, Hwaseong, Gyeonggi 18323, KoreaResearch Center for Green Fine Chemicals, Korea Research Institute of Chemical Technology, Ulsan 44412, KoreaDepartment of Chemical and Biological Engineering, Korea University, Seoul 02841, KoreaParticle motion and coffee ring patterns in water-borne suspensions of polystyrene (PS) particle added with small amounts of secondary hydrophobic decalin are investigated during the drying of the suspension droplets, mainly employing light scattering methods. Very tiny secondary fluid insertions via high-speed agitation effectively link the particles through hydrophobic dissolution leading to the formation of multimodal particulate clusters, with resistance to the outward capillary flow and suppression of coffee ring formation after drying. The impact of decalin on particles is corroborated by actual images acquired from an optical profiler and a scanning electron microscope (SEM). The average particle motion inside the suspension changed by decalin was expressed in terms of mean square displacement (MSD) based on diffusing wave spectroscopy (DWS). Employing multispeckle diffusing wave spectroscopy (MSDWS), the rapid motion or β-relaxation of particles in various suspensions with and without decalin is quantified in early lag time during the drying of droplets. The change in particle dynamics during suspension drop drying, when adding a small secondary fluid, plays a key role in tuning coffee ring patterns.https://www.mdpi.com/1996-1944/13/15/3438autocorrelation functioncoffee ringdecalinlight scattering techniquespolystyrene particlessuspension drying |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Kevin Injoe Jung Baek Sung Park Seong Jae Lee Seung Man Noh Hyun Wook Jung |
spellingShingle |
Kevin Injoe Jung Baek Sung Park Seong Jae Lee Seung Man Noh Hyun Wook Jung Effect of Immiscible Secondary Fluid on Particle Dynamics and Coffee Ring Characteristics during Suspension Drying Materials autocorrelation function coffee ring decalin light scattering techniques polystyrene particles suspension drying |
author_facet |
Kevin Injoe Jung Baek Sung Park Seong Jae Lee Seung Man Noh Hyun Wook Jung |
author_sort |
Kevin Injoe Jung |
title |
Effect of Immiscible Secondary Fluid on Particle Dynamics and Coffee Ring Characteristics during Suspension Drying |
title_short |
Effect of Immiscible Secondary Fluid on Particle Dynamics and Coffee Ring Characteristics during Suspension Drying |
title_full |
Effect of Immiscible Secondary Fluid on Particle Dynamics and Coffee Ring Characteristics during Suspension Drying |
title_fullStr |
Effect of Immiscible Secondary Fluid on Particle Dynamics and Coffee Ring Characteristics during Suspension Drying |
title_full_unstemmed |
Effect of Immiscible Secondary Fluid on Particle Dynamics and Coffee Ring Characteristics during Suspension Drying |
title_sort |
effect of immiscible secondary fluid on particle dynamics and coffee ring characteristics during suspension drying |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2020-08-01 |
description |
Particle motion and coffee ring patterns in water-borne suspensions of polystyrene (PS) particle added with small amounts of secondary hydrophobic decalin are investigated during the drying of the suspension droplets, mainly employing light scattering methods. Very tiny secondary fluid insertions via high-speed agitation effectively link the particles through hydrophobic dissolution leading to the formation of multimodal particulate clusters, with resistance to the outward capillary flow and suppression of coffee ring formation after drying. The impact of decalin on particles is corroborated by actual images acquired from an optical profiler and a scanning electron microscope (SEM). The average particle motion inside the suspension changed by decalin was expressed in terms of mean square displacement (MSD) based on diffusing wave spectroscopy (DWS). Employing multispeckle diffusing wave spectroscopy (MSDWS), the rapid motion or β-relaxation of particles in various suspensions with and without decalin is quantified in early lag time during the drying of droplets. The change in particle dynamics during suspension drop drying, when adding a small secondary fluid, plays a key role in tuning coffee ring patterns. |
topic |
autocorrelation function coffee ring decalin light scattering techniques polystyrene particles suspension drying |
url |
https://www.mdpi.com/1996-1944/13/15/3438 |
work_keys_str_mv |
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