Synthesis of Liquid Core–Shell Particles and Solid Patchy Multicomponent Particles by Shearing Liquids Into Complex Particles (SLICE)

Langmuir ◽  
2014 ◽  
Vol 30 (47) ◽  
pp. 14308-14313 ◽  
Author(s):  
Ian D. Tevis ◽  
Lucas B. Newcomb ◽  
Martin Thuo
Keyword(s):  
Liquid Core ◽  
Core Shell ◽  
Shell Particles

scholarly journals Thermal and Mechanical Stabilities of Core-shell Microparticles Containing a Liquid Core

2021 ◽  
Author(s):  
Nam-Trung Nguyen ◽  
Nam-Trung Nguyen ◽  
Nam-Trung Nguyen ◽  
Nam-Trung Nguyen
Keyword(s):  
Shell Thickness ◽  
Liquid Core ◽  
Maximum Temperature ◽  
Heating Process ◽  
Core Shell ◽  
Rupture Force ◽  
Compression Force ◽  
Operation Conditions ◽  
Mechanical Models ◽  
Shell Particles

Abstract Thorough understanding of the behaviour of core-shell microparticles with a liquid core is essential for determining their performance in applications under different operation conditions. This paper reports the behaviour of core-shell particles with a liquid core under thermal and mechanical loads. First, we formulated an analytical model for the heating process of a core-shell microparticle with a liquid core. Next, we utilised an axisymmetric model of an elastic spherical shell upon compression to describe the deformation of a core-shell microparticle. Finally, we conducted experiments to validate these models. Both thermal and mechanical models agree well with the experimental data. The maximum temperature a core-shell microparticle can withstand depends on the liquid, the geometry, and the material of the shell. The critical compression force before rupture of a core-shell microparticle depends on the Poisson’s ratio of the shell material and the shell thickness relative to the outer shell radius. The rupture force and rupture temperature increase with increasing shell thickness.

scholarly journals Formation of core-shell droplets for the encapsulation of liquid contents

2021 ◽  
Author(s):  
Fariba Malekpour Galogahi ◽  
Yong Zhu ◽  
Hongjie An ◽  
Nam-Trung Nguyen
Keyword(s):  
Microfluidic Device ◽  
Liquid Core ◽  
Core Shell ◽  
Flow Focusing ◽  
The Core ◽  
Liquid Phases ◽  
Optical Electron ◽  
Computed Microtomography ◽  
Shell Particles ◽  
High Degree

Abstract Accurate control of monodisperse core-shell droplets generated in a microfluidic device has a broad range of applications in research and industry. This paper reports the experimental investigation of flow-focusing microfluidic devices capable of producing size-tuneable and monodisperse core-shell droplets. The dimension of the core-shell droplets was controlled passively by the channel geometry and the flow rate of the liquid phases. The results indicate that microchannel geometry is more significant than flow rates. The highly controllable core-shell droplets could be subsequently employed as a template for generating core-shell micropaticles with liquid core. Optical, electron microscopy and X-ray computed microtomography showed that the geometry of the core-shell droplets remains unchanged after solidification, drying and collection. The present study also looks at the thermal stability of core-shell particles depending on the particle size. The larger core-shell partcles with a thicker shell provide a higher resistance to heating at elevated temperature. The high degree of control with a flow-focusing microfluidic device makes this a promising approach for the encapsulation, storage, and delivery of lipophilic contents.

scholarly journals Mechanical Fracturing of Core-Shell Undercooled Metal Particles for Heat-Free Soldering

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Simge Çınar ◽  
Ian D. Tevis ◽  
Jiahao Chen ◽  
Martin Thuo
Keyword(s):  
Phase Change Materials ◽  
Low Cost ◽  
Liquid Core ◽  
Oxide Shell ◽  
Core Shell ◽  
Ambient Conditions ◽  
Complex Shapes ◽  
Droplet Emulsion ◽  
Shell Particles ◽  
Poor Stability

Abstract Phase-change materials, such as meta-stable undercooled (supercooled) liquids, have been widely recognized as a suitable route for complex fabrication and engineering. Despite comprehensive studies on the undercooling phenomenon, little progress has been made in the use of undercooled metals, primarily due to low yields and poor stability. This paper reports the use of an extension of droplet emulsion technique (SLICE) to produce undercooled core-shell particles of structure; metal/oxide shell-acetate (‘/’ = physisorbed, ‘-’ = chemisorbed), from molten Field’s metal (Bi-In-Sn) and Bi-Sn alloys. These particles exhibit stability against solidification at ambient conditions. Besides synthesis, we report the use of these undercooled metal, liquid core-shell, particles for heat free joining and manufacturing at ambient conditions. Our approach incorporates gentle etching and/or fracturing of outer oxide-acetate layers through mechanical stressing or shearing, thus initiating a cascade entailing fluid flow with concomitant deformation, combination/alloying, shaping, and solidification. This simple and low cost technique for soldering and fabrication enables formation of complex shapes and joining at the meso- and micro-scale at ambient conditions without heat or electricity.

scholarly journals Thermal and Mechanical Stabilities of Core-shell Microparticles Containing a Liquid Core

2021 ◽  
Author(s):  
Fariba Malekpour Galogahi ◽  
Hongjie An ◽  
Yong Zhu ◽  
Nam-Trung Nguyen
Keyword(s):  
Shell Thickness ◽  
Liquid Core ◽  
Maximum Temperature ◽  
Heating Process ◽  
Core Shell ◽  
Rupture Force ◽  
Compression Force ◽  
Operation Conditions ◽  
Mechanical Models ◽  
Shell Particles

Abstract Thorough understanding of the behaviour of core-shell microparticles with a liquid core is essential for determining their performance in applications under different operation conditions. This paper reports the behaviour of core-shell particles with a liquid core under thermal and mechanical loads. First, we formulated an analytical model for the heating process of a core-shell microparticle with a liquid core. Next, we utilised an axisymmetric model of an elastic spherical shell upon compression to describe the deformation of a core-shell microparticle. Finally, we conducted experiments to validate these models. Both thermal and mechanical models agree well with the experimental data. The maximum temperature a core-shell microparticle can withstand depends on the liquid, the geometry, and the material of the shell. The critical compression force before rupture of a core-shell microparticle depends on the Poisson’s ratio of the shell material and the shell thickness relative to the outer shell radius. The rupture force and rupture temperature increase with increasing shell thickness.

Magnetic Properties of Fe3O4/CoFe2O4 Composite Nanoparticles with Core/Shell Architecture

2020 ◽  
Vol 65 (10) ◽  
pp. 904
Author(s):  
V. O. Zamorskyi ◽  
Ya. M. Lytvynenko ◽  
A. M. Pogorily ◽  
A. I. Tovstolytkin ◽  
S. O. Solopan ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Spinel Ferrite ◽  
Composite Nanoparticles ◽  
Core Shell ◽  
Cofe2o4 Nanoparticles ◽  
Core Diameter ◽  
The Core ◽  
Shell Particles ◽  
Interface Parameters ◽  
Shell Composite

Magnetic properties of the sets of Fe3O4(core)/CoFe2O4(shell) composite nanoparticles with a core diameter of about 6.3 nm and various shell thicknesses (0, 1.0, and 2.5 nm), as well as the mixtures of Fe3O4 and CoFe2O4 nanoparticles taken in the ratios corresponding to the core/shell material contents in the former case, have been studied. The results of magnetic research showed that the coating of magnetic nanoparticles with a shell gives rise to the appearance of two simultaneous effects: the modification of the core/shell interface parameters and the parameter change in both the nanoparticle’s core and shell themselves. As a result, the core/shell particles acquire new characteristics that are inherent neither to Fe3O4 nor to CoFe2O4. The obtained results open the way to the optimization and adaptation of the parameters of the core/shell spinel-ferrite-based nanoparticles for their application in various technological and biomedical domains.

Titanium Dioxide−Polymer Core–Shell Particles Dispersions as Electronic Inks for Electrophoretic Displays

2008 ◽  
Vol 20 (4) ◽  
pp. 1292-1298 ◽  
Author(s):  
M. P. L. Werts ◽  
M. Badila ◽  
C. Brochon ◽  
A. Hébraud ◽  
G. Hadziioannou
Keyword(s):  
Titanium Dioxide ◽  
Core Shell ◽  
Shell Particles

From Ab Initio Calculations to Multiscale Design of Si/C Core–Shell Particles for Li-Ion Anodes

Nano Letters ◽  
2014 ◽  
Vol 14 (4) ◽  
pp. 2140-2149 ◽  
Author(s):  
Maria E. Stournara ◽  
Yue Qi ◽  
Vivek B. Shenoy
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Core Shell ◽  
Li Ion ◽  
Shell Particles

Development of magnetic ytterbium oxide core–shell particles for selectively trapping phosphopeptides

2016 ◽  
Vol 8 (15) ◽  
pp. 3061-3068 ◽  
Author(s):  
Christina Meisenbichler ◽  
Julia S. Rauch ◽  
Yüksel Güzel ◽  
Eva-Maria Wernig ◽  
Dieter Schemeth ◽  
...  
Keyword(s):  
Core Shell ◽  
Ytterbium Oxide ◽  
Selective Enrichment ◽  
Phosphorylated Peptides ◽  
Shell Particles

Selective enrichment of phosphorylated peptides by magnetic ytterbium oxide core-shell particles.

One-pot synthesis of the macroporous polyaniline microspheres and Ag/polyaniline core-shell particles

2005 ◽  
Vol 84 (1-3) ◽  
pp. 254-260 ◽  
Author(s):  
Jimin Du ◽  
Zhimin Liu ◽  
Buxing Han ◽  
Zhonghao Li ◽  
Jianling Zhang ◽  
...  
Keyword(s):  
Core Shell ◽  
One Pot ◽  
One Pot Synthesis ◽  
Shell Particles
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