scholarly journals Three-dimensional ultrasonic trapping of micro-particles in water with a simple and compact two-element transducer

2017 ◽  
Vol 111 (9) ◽  
pp. 094101 ◽  
Author(s):  
A. Franklin ◽  
A. Marzo ◽  
R. Malkin ◽  
B. W. Drinkwater
Keyword(s):  
Three Dimensional ◽  
Micro Particles

scholarly journals 3D monitoring of the surface slippage effect on micro-particle sedimentation by digital holographic microscopy

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Majid Panahi ◽  
Ramin Jamali ◽  
Vahideh Farzam Rad ◽  
Mojtaba Khorasani ◽  
Ahamd Darudi ◽  
...  
Keyword(s):  
Slip Length ◽  
Particle Interaction ◽  
Three Dimensional ◽  
Digital Holographic Microscopy ◽  
Particle Sedimentation ◽  
Micro Particles ◽  
Slippage Effect ◽  
Holographic Microscopy ◽  
3D Information ◽  
Experimental Findings

AbstractIn several phenomena in biology and industry, it is required to understand the comprehensive behavior of sedimenting micro-particles in fluids. Here, we use the numerical refocusing feature of digital holographic microscopy (DHM) to investigate the slippage effect on micro-particle sedimentation near a flat wall. DHM provides quantitative phase contrast and three-dimensional (3D) imaging in arbitrary time scales, which suggests it as an elegant approach to investigate various phenomena, including dynamic behavior of colloids. 3D information is obtained by post-processing of the recorded digital holograms. Through analysis of 3D trajectories and velocities of multiple sedimenting micro-particles, we show that proximity to flat walls of higher slip lengths causes faster sedimentation. The effect depends on the ratio of the particle size to (1) the slip length and (2) its distance to the wall. We corroborate our experimental findings by a theoretical model which considers both the proximity and the particle interaction to a wall of different hydrophobicity in the hydrodynamic forces.

Accurate three-dimensional detection of micro-particles by means of digital holographic microscopy

2008 ◽  
Author(s):  
Maciej Antkowiak ◽  
Natacha Callens ◽  
Cédric Schockaert ◽  
Catherine Yourassowsky ◽  
Frank Dubois
Keyword(s):  
Three Dimensional ◽  
Digital Holographic Microscopy ◽  
Micro Particles ◽  
Holographic Microscopy

Microstructural characterization and effective viscoelastic behavior of magnetorheological elastomers with varying acetone contents

2016 ◽  
Vol 26 (1) ◽  
pp. 104-118 ◽  
Author(s):  
Robbie Damiani ◽  
LZ Sun
Keyword(s):  
Mechanical Properties ◽  
Smart Materials ◽  
Three Dimensional ◽  
Viscoelastic Behavior ◽  
Microstructural Characterization ◽  
Iron Particle ◽  
Magnetorheological Elastomers ◽  
Micro Particles ◽  
Particle Alignment ◽  
Magnetorheological Effect

Magnetorheological elastomers (MREs), a class of polymer-based composites with dispersed ferromagnetic micro-particles, fall in the class of smart materials, because their macroscopic or effective rheological properties can be continuously, rapidly, and reversibly changed with the application of a magnetic field. Conventional magnetorheological elastomers exhibit poor mechanical properties and magnetorheological effect as a result of their matrix materials and the particle-matrix interfaces. Here, we investigate the effect of acetone contents on the magnetorheological elastomer microstructure at the interfacial regions using the scanning electron microscope and the three-dimensional nano-CT imaging, as well as determining the overall or effective mechanical properties of magnetorheological elastomers. It is shown that acetone increases both the overall storage modulus and loss factor along with the magnetorheological effect due to acetone’s reaction on the interface as well as its effect on iron particle alignment.

Synthesis of Layered Titanate Micro/nano-materials for Efficient Pollutant Treatment in Aqueous Media

2011 ◽  
Vol 1309 ◽  
Author(s):  
Y. X. Tang ◽  
Y. K. Lai ◽  
D. G. Gong ◽  
Zhili Dong ◽  
Z. Chen
Keyword(s):  
Aqueous Media ◽  
Three Dimensional ◽  
High Specific Surface Area ◽  
Nano Materials ◽  
Raman Scattering Spectroscopy ◽  
Micro Particles ◽  
Transmission Electron ◽  
Composition And Structure ◽  
Layered Titanate ◽  
The One

ABSTRACTIn this work, the one dimensional (1D) titanate nanotubes (TNT)/nanowires (TNW), bulk titanate micro-particles (TMP), and three dimensional (3D) titanate microsphere particles (TMS) with high specific surface area were synthesized via different approaches. The chemical composition and structure of these products have been characterized by field emission scanning electron microscopy (FESEM), transmission electron microscope (TEM) study and Raman scattering spectroscopy. The as-prepared TMS shows excellent adsorption performance compared with TMP, TNW and TNT when methylene blue (MB) and PbII ions are used as representative organic and inorganic pollutants.

Automatic three-dimensional localization of micro-particles using digital holographic microscopy

2008 ◽  
Author(s):  
Maciej Antkowiak ◽  
Natacha Callens ◽  
Catherine Yourassowsky ◽  
Frank Dubois
Keyword(s):  
Three Dimensional ◽  
Digital Holographic Microscopy ◽  
Micro Particles ◽  
Holographic Microscopy

scholarly journals Particle localization using local gradients and its application to nanometer stabilization of a microscope

2021 ◽  
Author(s):  
Anatolii V. Kashchuk ◽  
Oleksandr Perederiy ◽  
Chiara Caldini ◽  
Lucia Gardini ◽  
Francesco Saverio Pavone ◽  
...  
Keyword(s):  
Single Molecule ◽  
Three Dimensional ◽  
Universal Method ◽  
Superresolution Microscopy ◽  
Accurate Localization ◽  
Micro Particles ◽  
Localization Algorithms ◽  
Gradient Calculation ◽  
Particle Localization ◽  
Local Gradient

Accurate localization of single particles plays an increasingly important role in a range of biological techniques, including single molecule tracking and localization-based superresolution microscopy. Such techniques require fast and accurate particle localization algorithms as well as nanometer-scale stability of the microscope. Here, we present a universal method for three-dimensional localization of single labeled and unlabeled particles based on local gradient calculation of microscopy images. The method outperforms current techniques in high noise conditions, and it is capable of nanometer accuracy localization of nano- and micro-particles with sub-ms calculation time. By localizing a fixed particle as fiducial mark and running a feedback loop, we demonstrate its applicability for active drift correction in sensitive nanomechanical measurements such as optical trapping and superresolution imaging. A multiplatform open software package comprising a set of tools for local gradient calculation in brightfield and fluorescence microscopy is shared to the scientific community.

scholarly journals Multi-Stage Particle Separation based on Microstructure Filtration and Dielectrophoresis

Micromachines ◽  
2019 ◽  
Vol 10 (2) ◽  
pp. 103 ◽  
Author(s):  
Danfen Yin ◽  
Xiaoling Zhang ◽  
Xianwei Han ◽  
Jun Yang ◽  
Ning Hu
Keyword(s):  
3D Model ◽  
Haematococcus Pluvialis ◽  
Three Dimensional ◽  
Particle Separation ◽  
Size Difference ◽  
Dielectrophoretic Force ◽  
Biomedical Analysis ◽  
Micro Particles ◽  
Multi Stage ◽  
Array Structure

Particle separation is important in chemical and biomedical analysis. Among all particle separation approaches, microstructure filtration which based particles size difference has turned into one of the most commonly methods. By controlling the movement of particles, dielectrophoresis has also been widely adopted in particle separation. This work presents a microfluidic device which combines the advantages of microfilters and dielectrophoresis to separate micro-particles and cells. A three-dimensional (3D) model was developed to calculate the distributions of the electric field gradient at the two filter stages. Polystyrene particles with three different sizes were separated by micropillar array structure by applying a 35-Vpp AC voltage at 10 KHz. The blocked particles were pushed off the filters under the negative dielectrophoretic force and drag force. A mixture of Haematococcus pluvialis cells and Bracteacoccus engadinensis cells with different sizes were also successfully separated by this device, which proved that the device can separate both biological samples and polystyrene particles.

3D monitoring of the surface slippage effect on micro-particle sedimentation by digital holographic microscopy

2021 ◽  
Author(s):  
Majid Panahi ◽  
Ramin Jamali ◽  
Vahideh Farzam Rad ◽  
Mojtaba Khorasani ◽  
Ahamd Darudi ◽  
...  
Keyword(s):  
Slip Length ◽  
Particle Interaction ◽  
Three Dimensional ◽  
Digital Holographic Microscopy ◽  
Particle Sedimentation ◽  
Micro Particles ◽  
Slippage Effect ◽  
Holographic Microscopy ◽  
3D Information ◽  
Experimental Findings

Abstract In several phenomena in biology and industry, it is required to understand the comprehensive behavior of sedimenting micro-particles in fluids. Here, we use the numerical refocusing feature of digital holographic microscopy (DHM) to investigate the slippage effect on micro-particle sedimentation near a flat wall. DHM provides quantitative phase contrast and three-dimensional (3D) imaging in arbitrary time scales, which suggests it as an elegant approach to investigate various phenomena, including dynamic behavior of colloids. 3D information is obtained by post-processing of the recorded digital holograms. Through analysis of 3D trajectories and velocities of multiple sedimenting micro-particles, we show that proximity to flat walls of higher slip lengths causes faster sedimentation. The effect depends on the ratio of the particle size to (1) the slip length and (2) its distance to the wall. We corroborate our experimental findings by a theoretical model which considers both the proximity and the particle interaction to a wall of different hydrophobicity in the hydrodynamic forces.

Micro-Particle Fabrication for Tissue Engineering Applications Using Rapid Prototyping and Soft Lithography Principles

2005 ◽  
Author(s):  
M. Wettergreen ◽  
J. Scheffe ◽  
A. G. Mikos ◽  
M. A. K. Liebschner
Keyword(s):  
Tissue Engineering ◽  
Rapid Prototyping ◽  
Soft Lithography ◽  
Porous Scaffold ◽  
Three Dimensional ◽  
Volume Ratio ◽  
Engineering Applications ◽  
Three Dimensional Printing ◽  
Micro Particles ◽  
Multiple Materials

The goal of this study was to develop an efficient and repeatable process for fabrication of micro-particles from multiple materials using rapid prototyping and soft lithography. Phase change three-dimensional printing was used to create masters for PDMS molds. A photocrosslinkable polymer was then delivered into these molds to fabricate geometrically complex three-dimensional micro-particles. This repeatable process has demonstrated the ability to generate micro-particles with greater than 95% repeatability with complete pattern transfer. This process was illustrated for three shapes based on the extrusion of two-dimensional shapes. These particles will allow for tailoring of the pore shapes within a porous scaffold utilized in tissue engineering applications. In addition, the different shapes may allow control of drug release by varying the surface to volume ratio, which could modulate drug delivery. While soft lithography is currently used with photolithography, its high precision is offset by high cost of production. The employment of rapid prototyping to a specific resolution offers a much less expensive alternative with increased throughput due to the speed of current rapid prototyping systems.

scholarly journals The effects of nano- and micro-sized additives on 3D printable cementitious and alkali-activated composites: a review

2021 ◽  
Author(s):  
Pawel Sikora ◽  
Mehdi Chougan ◽  
Karla Cuevas ◽  
Marco Liebscher ◽  
Viktor Mechtcherine ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Construction Materials ◽  
Great Influence ◽  
Research Progress ◽  
Layer By Layer ◽  
Clay Nanoparticles ◽  
Three Dimensional Objects ◽  
Micro Particles ◽  
Recent Developments ◽  
Alkali Activated

AbstractAdditive manufacturing (AM), also referred as 3D printing, is a technology that enables building automated three-dimensional objects in a layer-by-layer manner. AM of cement-based and alkali-activated composites has gathered attention over the last decade and is one of the most rapidly developing civil engineering fields. Development of proper mixture compositions which are suitable in fresh and hardened state is one of the key challenges of AM technology in construction. As the behaviour of cement-based materials (CBM) and alkali-activated materials (AAM) is determined by chemical and physical processes at the nano-level, incorporation of nano- and micro-sized admixtures has great influence on the performance of printable composites. These modifications are attributed to the unique reactivity of nanoparticles associated with their small size and large surface area. This review paper summarizes recent developments in the application of nano- and micro-particles on 3D printable cementitious composites and how they influence the performance of 3D-printed construction materials. The research progress on nano-engineered CBM and AAM is reviewed from the view of fresh and hardened properties. Moreover, comparison between nano- and micro-sized admixtures including nanosilica, graphene-based materials, and clay nanoparticles as well as chemical admixtures such as viscosity-modifying admixtures and superplasticizers is presented. Finally, the existing problems in current research and future perspectives are summarized. This review provides useful recommendations toward the significant influence of nano- and micro-sized admixtures on the performance of 3D printable CBMs.

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