scholarly journals Breadth versus depth: Interactions that stabilize particle assemblies to changes in density or temperature

2016 ◽  
Vol 144 (8) ◽  
pp. 084502 ◽  
Author(s):  
William D. Piñeros ◽  
Michael Baldea ◽  
Thomas M. Truskett
Keyword(s):  
Particle Assemblies

A matrix analysis of processes involving particle assemblies

1956 ◽  
Vol 249 (960) ◽  
pp. 99-123 ◽  
Keyword(s):  
Particle Size ◽  
Matrix Analysis ◽  
Mathematical Form ◽  
Size Distributions ◽  
Ball Mills ◽  
Particle Assembly ◽  
Coal Particles ◽  
Breakage Function ◽  
Grinding Machine ◽  
Particle Assemblies

The processes analyzed in this paper are the size reduction and size classification of particle assemblies. Particle size distributions are described by vectors, and alterations to size distributions during breakage processes are described by matrices multiplying the vectors. The matrix approximation gives an adequate representation of the processes studied, and the manipulation of the matrices is easy and flexible. The breakage of a particle assembly is thought of as two processes. In the first, the machine breaking the particles is said to select for breakage a proportion of the particles, and the remaining particles are unbroken. To discover a function or matrix which describes the process of selection is to understand how the machine operates. In the second process, the particles selected are broken in a regular way; the proportions of particles of each size formed by the breakage are described by a breakage function or a breakage matrix. The analysis of breakage is in this way given convenient mathematical form. These matrices depend on the characteristics of the machine and on the nature of the particle assembly. After breaking the particles, crushing and grinding machines frequently pass the product assemblies to a classifier from which the larger particles are returned, mixed with fresh material, to the grinding zone. The analysis is extended to the description of such circuits. The experimental work reported concerns the breaking of coal particles in a new grinding machine, ball mills, shatter tests and a beater mill. The selection functions derived throw light on the operation of these machines. Coal breakage has been studied since it is an important field of application, and because coal is typical in breakage of homogeneous rocks. For each of the machines examined and for each particle size, a single breakage function has sufficed to describe the product of breakage: [1 —exp ( —z)]/[ 1 —exp ( — 1)] is the proportion of the product smaller than a fraction z of the original particle size.

scholarly journals Glassy dynamics of dense particle assemblies on a spherical substrate

2018 ◽  
Vol 148 (16) ◽  
pp. 164501 ◽  
Author(s):  
Julien-Piera Vest ◽  
Gilles Tarjus ◽  
Pascal Viot
Keyword(s):  
Glassy Dynamics ◽  
Dense Particle ◽  
Particle Assemblies

Thermal-Conductivity Enhancement of Microfluids With Ni3(μ3-ppza)4Cl2 Metal String Complex Particles

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Baghir A. Suleimanov ◽  
Hakim F. Abbasov ◽  
Fuad F. Valiyev ◽  
Rayyat H. Ismayilov ◽  
Shie-Ming Peng
Keyword(s):  
Thermal Conductivity ◽  
Thermal Conductivity Enhancement ◽  
Water Molecules ◽  
Glycerol Solution ◽  
Transient Hot Wire ◽  
Colloidal Structure ◽  
Conductivity Enhancement ◽  
Water Glycerol ◽  
Wire Method ◽  
Particle Assemblies

The thermal conductivity of microfluids comprising Ni3(μ3-ppza)4Cl2 metal string complex (MSC) microparticles in an aqueous glycerol solution was investigated using the transient hot-wire method. A comparative analysis of the thermal-conductivity enhancements of microfluids and nanofluids revealed that the best results were achieved using microparticles of monocrystalline MSCs Ni3(μ3-ppza)4Cl2 as well as Ni5(μ5-pppmda)4Cl2 micro- and copper nanoparticles. Compared to the base fluid, the thermal-conductivity enhancements were 72% for Ni3–water–glycerol, 53% for Cu–water–glycerol, and 47% for Ni5–water–glycerol. It is shown that the high thermal-conductivity enhancement achieved with Ni3 microfluids is a result of higher stability in compare with nanofluid due to the lower density of the microparticles and the formation of particle assemblies. Therefore, the formation of hydrogen bonds between the MSC particles (through their organic fragments) and water molecules, takes place. Colloidal structure of Ni3-microfluids has a significant impact on their thermophysical properties.

Quantifying patterns in optical micrographs of one- and two-dimensional ellipsoidal particle assemblies

Soft Matter ◽  
2020 ◽  
Vol 16 (48) ◽  
pp. 10900-10909
Author(s):  
Veronica Grebe ◽  
Mingzhu Liu ◽  
Marcus Weck
Keyword(s):  
Two Dimensional ◽  
Ellipsoidal Particle ◽  
Colloidal Science ◽  
Particle Assemblies ◽  
Optical Micrographs

Current developments in colloidal science include the assembly of anisotropic colloids with broad geometric diversity.

scholarly journals Programmed assembly of oppositely charged homogeneously decorated and Janus particles

2016 ◽  
Vol 191 ◽  
pp. 89-104 ◽  
Author(s):  
Alina Kirillova ◽  
Georgi Stoychev ◽  
Alla Synytska
Keyword(s):  
Optical Properties ◽  
Electrostatic Interactions ◽  
Building Blocks ◽  
Janus Particles ◽  
Complex Structures ◽  
Janus Particle ◽  
Micro Structures ◽  
Oppositely Charged ◽  
Particle Assemblies ◽  
Programmed Assembly

The exploitation of colloidal building blocks with morphological and functional anisotropy facilitates the generation of complex structures with unique properties, which are not exhibited by isotropic particle assemblies. Herein, we demonstrate an easy and scalable bottom-up approach for the programmed assembly of hairy oppositely charged homogeneously decorated and Janus particles based on electrostatic interactions mediated by polyelectrolytes grafted onto their surface. Two different assembly routes are proposed depending on the target structures: raspberry-like/half-raspberry-like or dumbbell-like micro-clusters. Ultimately, stable symmetric and asymmetric micro-structures could be obtained in a well-controlled manner for the homogeneous–homogeneous and homogeneous–Janus particle assemblies, respectively. The spatially separated functionalities of the asymmetric Janus particle-based micro-clusters allow their further assembly into complex hierarchical constructs, which may potentially lead to the design of materials with tailored plasmonics and optical properties.

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