Polyelectrolyte Adsorption on an Oppositely Charged Spherical Particle. Chain Rigidity Effects

2002 ◽  
Vol 35 (25) ◽  
pp. 9556-9562 ◽  
Author(s):  
Serge Stoll ◽  
Pierre Chodanowski
Keyword(s):  
Spherical Particle ◽  
Polyelectrolyte Adsorption ◽  
Chain Rigidity ◽  
Particle Chain ◽  
Oppositely Charged

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

Sensors ◽  
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.

Polymer Layer Ordering of Polyaniline Derivatives in Pled Devices: Surface Adsorption and Characterization

1997 ◽  
Vol 488 ◽  
Author(s):  
R. C. Advincula ◽  
W. Knoll ◽  
C. W. Frank ◽  
D. Roitman ◽  
R. Moon ◽  
...  
Keyword(s):  
Light Emitting Diode ◽  
Deposition Process ◽  
Film Structure ◽  
Hole Injection ◽  
Polyelectrolyte Adsorption ◽  
Light Emitting ◽  
Linear Behavior ◽  
Structure Morphology ◽  
Vis Spectroscopy ◽  
Oppositely Charged

AbstractThe fabrication and characterization of polyaniline (PANI) derivatives deposited on ITO coated glass is investigated as possible hole injection layers for MEH-PPV based polymer light emitting diode (PLED) devices. This involved multilayer ordering by the alternate polyelectrolyte adsorption of polyaniline and sulfonated poyaniline with an oppositely charged polyelectrolyte from solution. A combination of spectroscopic and microscopic techniques was utilized to determine the layer ordering, film structure, morphology, and homogeneity. The deposition process generally showed a linear behavior for all pairs as shown by ellipsometry and UV-vis spectroscopy. However, surface plasmon spectroscopy (SPS) and AFM revealed that thicker films are accompanied by increased surface roughness regardless of concentration. Comparison in performance was made between bare ITO and PANI or SPANI coated devices. Initial investigations of PLED performance showed significant improvements in lifetime and efficiency compared to bare ITO.

scholarly journals Shape anisotropy-governed locomotion of surface microrollers on vessel-like microtopographies against physiological flows

2021 ◽  
Vol 118 (13) ◽  
pp. e2022090118
Author(s):  
Ugur Bozuyuk ◽  
Yunus Alapan ◽  
Amirreza Aghakhani ◽  
Muhammad Yunusa ◽  
Metin Sitti
Keyword(s):  
Spherical Particle ◽  
Three Dimensional ◽  
Circulatory System ◽  
Shape Anisotropy ◽  
Flat Surfaces ◽  
Surface Microtopography ◽  
Particle Chain ◽  
3D Surface ◽  
Vessel Walls ◽  
Resistive Forces

Surface microrollers are promising microrobotic systems for controlled navigation in the circulatory system thanks to their fast speeds and decreased flow velocities at the vessel walls. While surface propulsion on the vessel walls helps minimize the effect of strong fluidic forces, three-dimensional (3D) surface microtopography, comparable to the size scale of a microrobot, due to cellular morphology and organization emerges as a major challenge. Here, we show that microroller shape anisotropy determines the surface locomotion capability of microrollers on vessel-like 3D surface microtopographies against physiological flow conditions. The isotropic (single, 8.5 µm diameter spherical particle) and anisotropic (doublet, two 4 µm diameter spherical particle chain) magnetic microrollers generated similar translational velocities on flat surfaces, whereas the isotropic microrollers failed to translate on most of the 3D-printed vessel-like microtopographies. The computational fluid dynamics analyses revealed larger flow fields generated around isotropic microrollers causing larger resistive forces near the microtopographies, in comparison to anisotropic microrollers, and impairing their translation. The superior surface-rolling capability of the anisotropic doublet microrollers on microtopographical surfaces against the fluid flow was further validated in a vessel-on-a-chip system mimicking microvasculature. The findings reported here establish the design principles of surface microrollers for robust locomotion on vessel walls against physiological flows.

Thermal Buoyancy-Aided Flow around a Heated/Cooled Spherical Particle

2011 ◽  
Vol 42 (8) ◽  
pp. 689-710 ◽  
Author(s):  
P. P. Gopmandal ◽  
Somnath Bhattacharyya
Keyword(s):  
Spherical Particle ◽  
Thermal Buoyancy
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