The Experts below are selected from a list of 41157 Experts worldwide ranked by ideXlab platform
Hiroyuki Ohshima - One of the best experts on this subject based on the ideXlab platform.
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Electrical Phenomena in a suspension of soft particles
Soft Matter, 2012Co-Authors: Hiroyuki OhshimaAbstract:The stability of a suspension of colloidal particles is determined by the interparticle electrostatic interaction, which in turn depends on the particle surface potential. The surface potential or charge of a charged colloidal particle can be evaluated by measuring its electrophoretic mobility. In the present article we focus on soft particles, that is, hard particles covered with an ion-penetrable surface layer of polyelectrolytes and provide various approximate analytic expressions for the electrostatic interaction energy between soft particles and for the electrophoretic mobility of soft particles. These expressions, which depend on the Donnan potential in the surface layer, are quite different from those for hard particles without surface structures.
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Electrical Phenomena of soft particles a soft step function model
Journal of Physical Chemistry A, 2012Co-Authors: Hiroyuki OhshimaAbstract:Simple analytic expressions are derived for the electrophoretic mobility of a soft particle consisting of the hard particle core covered with an ion-penetrable surface layer of polyelectrolyte for the case where the electric potential is low. The effect of the distribution of the polymer segments is taken into account by modeling the surface layer as a soft step function with the inhomogeneous distribution width δ. It is shown that the electrophoretic mobility becomes lower than that for the hard step function model and that the maximum deviation of the soft step function model from the hard step function model, which is a function of λδ (where 1/λ is the softness parameter) and κ/λ (where κ is the Debye-Huckel parameter), is 2.7% at λδ = 0.1, 5.1% at λδ = 0.2, and 11% at λδ = 0.5. In the limit of very high electrolyte concentrations, the obtained mobility expression tends to the result derived from the conventional hard step function model. In addition, an analytic expression for the interaction energy between two similar soft plates is derived on the basis of the present soft step function model. The magnitude of the interaction energy is shown to decrease by a factor 1/(1 + κδ)(2). Approximate analytic expressions for the interaction energies between two similar soft spheres and between two similar soft cylinders are also derived with the help of Derjaguin's approximation.
Md Shofiqul Islam - One of the best experts on this subject based on the ideXlab platform.
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analytical modeling of organic solar cells including monomolecular recombination and carrier generation calculated by optical transfer matrix method
Organic Electronics, 2017Co-Authors: Md Shofiqul IslamAbstract:Abstract An analytical model of organic solar cell has been developed including the effect of monomolecular recombination and charge carrier generation rate, simultaneously. The charge carrier generation rate, depending on position and wavelength, obtained from optical transfer matrix method, has been incorporated into Electrical transport equation of carriers; this has led to combining optical and Electrical Phenomena into this model. Charge carrier generation rate profile has been investigated and included to develop the model. The proposed model addresses the propagation of light and the effects of optical Phenomena like reflection and interference inside the device. Compared to previous models, this model is an improved version because of considering recombination mechanism and position and wavelength dependent generation rate simultaneously. This analytical model is useful for finding the performance of the organic solar cell device such as current-voltage relation, power-voltage relation, efficiency, etc. avoiding the complexities of numerical calculations. The proposed model has been validated by comparing the results obtained from the model with that of published experimental works. This model may help to analyse organic solar cells and optimize their parameters for improving the performance.
M. K. Alam - One of the best experts on this subject based on the ideXlab platform.
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An optoelectronic analytical model for bulk heterojunction organic solar cells incorporating position and wavelength dependent carrier generation
Solar Energy Materials and Solar Cells, 2015Co-Authors: M. M. Chowdhury, M. K. AlamAbstract:We present an optoelectronic analytical model for bulk heterojunction organic solar cells. Incorporating optical transfer matrix theory in the Electrical transport equations, we combine optical and Electrical Phenomena. This leads us to a single unified expression of current-voltage characteristic which considers the position and wavelength dependent carrier generation rate. Spatial distribution of the carrier generation rate is considered rigorously unlike previous analytical models. The model is capable of considering the optical propagation through the device structure as well as the optical Phenomena such as reflections and interference effects. We verify the model with numerical results and published experimental data.
Leon O. Chua - One of the best experts on this subject based on the ideXlab platform.
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cyclic voltammetry of volatile memristors in the venus flytrap short term memory
Functional Plant Biology, 2021Co-Authors: Alexander G Volkov, Leon O. ChuaAbstract:Plants have sensory, short-term and long-term memory. Possible candidates for memory in plants are memristors; resistors with memory. Memristors have been found in seeds, plants, flowers and fruits. The electrostimulation of plants by bipolar periodic waves can induce Electrical responses with fingerprints of volatile or non-volatile memristors. Here, we show that the electrostimulation of the Venus flytrap (Dionaea muscipula Ellis) by unipolar sinusoidal or triangular periodic Electrical trains induces Electrical responses in plants with fingerprints of volatile memristors. The discovery of volatile generic memristors in plants opens new directions in the modelling and understanding of Electrical Phenomena in the plant kingdom.
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Memory elements in the Electrical network of Mimosa pudica L.
Plant Signaling & Behavior, 2014Co-Authors: Alexander G Volkov, Jada Reedus, Colee M. Mitchell, Clayton Tuckett, Maya I Volkova, Vladislav S Markin, Leon O. ChuaAbstract:The fourth basic circuit element, a memristor, is a resistor with memory that was postulated by Chua in 1971. Here we found that memristors exist in vivo. The electrostimulation of the Mimosa pudica by bipolar sinusoidal or triangle periodic waves induce Electrical responses with fingerprints of memristors. Uncouplers carbonylcyanide-3-chlorophenylhydrazone and carbonylcyanide-4-trifluoromethoxy-phenyl hydrazone decrease the amplitude of Electrical responses at low and high frequencies of bipolar sinusoidal or triangle periodic electrostimulating waves. Memristive behavior of an Electrical network in the Mimosa pudica is linked to the properties of voltage gated ion channels: the channel blocker TEACl reduces the electric response to a conventional resistor. Our results demonstrate that a voltage gated K+ channel in the excitable tissue of plants has properties of a memristor. The discovery of memristors in plants creates a new direction in the modeling and understanding of Electrical Phenomena in plants.
Colin Price - One of the best experts on this subject based on the ideXlab platform.
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Challenges in coupling atmospheric electricity with biological systems
International Journal of Biometeorology, 2021Co-Authors: Ellard R. Hunting, James Matthews, Pablo Fernández Arróyabe Hernáez, Sam J. England, Konstantinos Kourtidis, Kuang Koh, Keri Nicoll, R. Giles Harrison, Konstantine Manser, Colin PriceAbstract:The atmosphere is host to a complex electric environment, ranging from a global electric circuit generating fluctuating atmospheric electric fields to local lightning strikes and ions. While research on interactions of organisms with their Electrical environment is deeply rooted in the aquatic environment, it has hitherto been confined to interactions with local Electrical Phenomena and organismal perception of electric fields. However, there is emerging evidence of coupling between large- and small-scale atmospheric Electrical Phenomena and various biological processes in terrestrial environments that even appear to be tied to continental waters. Here, we synthesize our current understanding of this connectivity, discussing how atmospheric electricity can affect various levels of biological organization across multiple ecosystems. We identify opportunities for research, highlighting its complexity and interdisciplinary nature and draw attention to both conceptual and technical challenges lying ahead of our future understanding of the relationship between atmospheric electricity and the organization and functioning of biological systems.