Computational investigation of longitudinal diffusion, eddy dispersion, and trans-particle mass transfer in bulk, random packings of core–shell particles with varied shell thickness and shell diffusion coefficient

2015 ◽  
Vol 1407 ◽  
pp. 139-156 ◽  
Author(s):  
Anton Daneyko ◽  
Dzmitry Hlushkou ◽  
Vasili Baranau ◽  
Siarhei Khirevich ◽  
Andreas Seidel-Morgenstern ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Diffusion Coefficient ◽  
Shell Thickness ◽  
Particle Mass ◽  
Core Shell ◽  
Computational Investigation ◽  
Longitudinal Diffusion ◽  
Shell Particles ◽  
Random Packings

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.

Preparation of Core–Shell Silica Microspheres with Controllable Shell Thickness for Fast High Performance Liquid Chromatography Separation of Alkyl Benzenes and Intact Proteins

2021 ◽  
Vol 17 (3) ◽  
pp. 439-446
Author(s):  
Hongjun Xia ◽  
Huaiming Wang ◽  
Jianshan Wang ◽  
Lin Wang ◽  
Lin Jin ◽  
...  
Keyword(s):  
High Performance ◽  
Shell Thickness ◽  
Separation Efficiency ◽  
Molar Ratio ◽  
Etching Time ◽  
Core Shell ◽  
Silica Microspheres ◽  
Liquid Chromatography Separation ◽  
Shell Particles ◽  
Alkyl Benzenes

As it is difficult to prevent secondary nucleation and agglomeration during the preparation of core–shell silica microspheres, these issues have been successfully resolved in this study using template-dissolution-induced redeposition. The non-porous particles are transformed into core–shell silica microspheres (CSSMs) in the presence of cetyltrimethylammonium bromide and octyltrimethylammonium bromide under basic conditions. The shell thickness and pore sizes of the CSSMs are controlled by adjusting the etching time and molar ratio of the template, respectively. The CSSMs are modified using octadecyltrimethylammonium chloride to separate the mixture of alkyl benzenes, and a high column separation efficiency is achieved within two minutes. The CSSMs are used for the separation and analysis of proteins and the digests of bovine serum albumin. The chromatographic column packed with core–shell particles affords a significantly higher separation efficiency than the commercial column. Therefore, as a chromatographic stationary phase, these core–shell particles can potentially be used for the fast separation of proteins, small solutes, and complex samples.

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.

Bio-Inspired Hydrogel-Calcium Carbonate Core-Shell Particles

2006 ◽  
Vol 988 ◽  
Author(s):  
Yi-Yeoun Kim ◽  
John W Catino ◽  
Gary P Tomaino ◽  
Sherman D Cox
Keyword(s):  
Calcium Carbonate ◽  
Shell Thickness ◽  
Room Temperature ◽  
Core Shell ◽  
Time Resolved ◽  
Liquid Precursor ◽  
Mineral Phases ◽  
Encapsulation Process ◽  
Shell Particles

AbstractIn this report, we present a bio-inspired encapsulation process to create nanocluster-assembled core-shell particles under aqueous, room temperature and non-toxic conditions. The approach to synthesize calcium carbonate core-shell particles is accomplished by employing a Polymer-Induced Liquid-Precursor (PILP) process. We demonstrate the amorphous mineral precursor is coated around a core of hydrogel nanoparticles, and subsequently solidified and crystallized. The synthesized core-shell particles are 300∼500nm diameter and ∼100 nm shell-thickness. We investigate the role of the hydrogel core of the particle using time-resolved XRD, thermal-XRD and thermal analysis. The organic hydrogel appears to influence the transformation of mineral phases, stabilizing the amorphous phase of calcium carbonate.

Exchange coupled SrFe12O19/Fe-Co core/shell particles with different shell thickness

2015 ◽  
Vol 11 (6) ◽  
pp. 1021-1027 ◽  
Author(s):  
Xia Xu ◽  
Yang-Ki Hong ◽  
Jihoon Park ◽  
Woncheol Lee ◽  
Alan M. Lane
Keyword(s):  
Shell Thickness ◽  
Core Shell ◽  
Shell Particles

An analytical scattering function for polydisperse spherical core–shell particles with Schulz–Flory size distributions of both core size and shell thickness

2012 ◽  
Vol 45 (3) ◽  
pp. 513-516 ◽  
Author(s):  
Joachim Wagner
Keyword(s):  
Numerical Integration ◽  
Shell Thickness ◽  
Core Shell ◽  
Size Distributions ◽  
Scattering Function ◽  
Theoretical Function ◽  
Nonlinear Curve Fitting ◽  
Spherical Core ◽  
Shell Particles ◽  
Time Required

The scattering function for polydisperse core–shell particles with Schulz–Flory size distributions of both the core radius and the shell thickness is analytically calculated. The results of the analytical solution are compared with the results of a numerical integration over both size distributions, as well as with available analytical solutions for homogeneous spheres. The CPU time required for the calculation of the scattering function can be reduced by several orders of magnitude compared with numerical integration. This is of tremendous importance in nonlinear curve fitting requiring repeated calculation of the theoretical function in an iterative process.

Facile and Affordable Process to Control Shell Thickness of Polydopamine-Assisted Polystyrene/Silver Core-Shell Particles

2019 ◽  
Vol 27 (11) ◽  
pp. 1104-1109 ◽  
Author(s):  
Jun Young Kim ◽  
Sung Ho Choi ◽  
Ji Hun An ◽  
Seong Jae Lee
Keyword(s):  
Shell Thickness ◽  
Core Shell ◽  
Shell Particles ◽  
Silver Core

Preparation and characterization of SiO2/TiO2 core-shell particles with controlled shell thickness

2007 ◽  
Vol 106 (1) ◽  
pp. 39-44 ◽  
Author(s):  
Jae-Won Lee ◽  
Sungmin Kong ◽  
Woo-Sik Kim ◽  
Jinsoo Kim
Keyword(s):  
Shell Thickness ◽  
Core Shell ◽  
Shell Particles

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.

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