Measuring, Modeling, and Predicting the Magnetic Assembly Rate of 2D-Staggered Janus Particle Chains

AbstractThe fabrication of a uniform array film through assembly of colloidal building blocks is of practical interest for the integrated individual and collective functions. Here, a magnetic assembly route was put forward to organize monodisperse noble metal microspheres into a uniform array film for surface-enhanced Raman scattering (SERS) application, which demonstrated the integrated signal sensitivity of single noble metal microspheres and reproducibility of their assembled uniform array film. For this purpose, monodisperse multifunctional Fe3O4@SiO2@TiO2@Ag (FOSTA) colloidal microspheres as building blocks were successfully synthesized through a homemade ultrasonic-assisted reaction system. When used in SERS test, these multifunctional microspheres could firstly bind the analyte (R6G) from solution and then assembled into a uniform film under an external magnetic field, which exhibited high SERS detection sensitivity with good reproducibility. In addition, due to the TiO2 interlayer in FOSTA colloidal microspheres, the building blocks could be recycled and self cleaned through photocatalytic degradation of the adsorbed analyte for recycling SERS application.

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Piezoelectric Impact Energy Harvester Based on the Composite Spherical Particle Chain for Self-Powered Sensors

Sensors ◽

10.3390/s21093151 ◽

2021 ◽

Vol 21 (9) ◽

pp. 3151

Author(s):

Shuo Yang ◽

Bin Wu ◽

Xiucheng Liu ◽

Mingzhi Li ◽

Heying Wang ◽

...

Keyword(s):

Energy Harvesting ◽

Spherical Particle ◽

Impact Energy ◽

Energy Harvester ◽

Composite Particle ◽

Piezoelectric Energy Harvesting ◽

Particle Chain ◽

Piezoelectric Energy ◽

Self Powered ◽

Particle Chains

In this study, a novel piezoelectric energy harvester (PEH) based on the array composite spherical particle chain was constructed and explored in detail through simulation and experimental verification. The power test of the PEH based on array composite particle chains in the self-powered system was realized. Firstly, the model of PEH based on the composite spherical particle chain was constructed to theoretically realize the collection, transformation, and storage of impact energy, and the advantages of a composite particle chain in the field of piezoelectric energy harvesting were verified. Secondly, an experimental system was established to test the performance of the PEH, including the stability of the system under a continuous impact load, the power adjustment under different resistances, and the influence of the number of particle chains on the energy harvesting efficiency. Finally, a self-powered supply system was established with the PEH composed of three composite particle chains to realize the power supply of the microelectronic components. This paper presents a method of collecting impact energy based on particle chain structure, and lays an experimental foundation for the application of a composite particle chain in the field of piezoelectric energy harvesting.

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Supercooled Water Drops Do Not Freeze During Impact on Hybrid Janus Particle-Based Surfaces

Chemistry of Materials ◽

10.1021/acs.chemmater.8b03183 ◽

2018 ◽

Vol 31 (1) ◽

pp. 112-123 ◽

Cited By ~ 9

Author(s):

Madeleine Schwarzer ◽

Thomas Otto ◽

Markus Schremb ◽

Claudia Marschelke ◽

Hisaschi T. Tee ◽

...

Keyword(s):

Supercooled Water ◽

Janus Particle ◽

Water Drops

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Wireless Electrografting of Molecular Layers for Janus Particle Synthesis

Chemistry - A European Journal ◽

10.1002/chem.201204198 ◽

2012 ◽

Vol 19 (5) ◽

pp. 1577-1580 ◽

Cited By ~ 27

Author(s):

Chawanwit Kumsapaya ◽

Marie-France Bakaï ◽

Gabriel Loget ◽

Bertrand Goudeau ◽

Chompunuch Warakulwit ◽

...

Keyword(s):

Janus Particle ◽

Particle Synthesis ◽

Molecular Layers

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Computer simulations of interactions between ultrafine alumina particles produced by an arc discharge

Journal of Materials Research ◽

10.1557/jmr.1997.0031 ◽

1997 ◽

Vol 12 (1) ◽

pp. 235-243 ◽

Cited By ~ 7

Author(s):

M. H. Teng ◽

L. D. Marks ◽

D. L. Johnson

Keyword(s):

Electron Microscope ◽

Surface Energy ◽

Transmission Electron Microscope ◽

Arc Discharge ◽

Total Surface Energy ◽

Transmission Electron ◽

Initial Stage ◽

Alumina Particles ◽

Rearrangement Process ◽

Particle Chains

We wrote two computer programs, 3D and BUMP, to interpret transmission electron microscope (TEM) micrographs made during a study of the initial stage sintering of ultrafine alumina particles (UFP's, 20–50 nm in diameter). The first simulated the 3D geometric relationships of particles, from which we concluded that surface diffusion was the predominant sintering mechanism because no shrinkage occurred. BUMP simulated random contact of two particles and showed that the particle chains that formed before sintering were not formed purely by chance. Instead the particles experienced a rearrangement process (rotation and sliding) which reduced the total surface energy.

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