Kinematics and Kinetics of Alternating Electric Field Induced Liquid Mass Transport on Chromium Thin Films

2021 ◽  
Author(s):  
Swapnendu Narayan Ghosh ◽  
Vijayendra Shastri ◽  
Debjit Sarkar ◽  
Ebinesh Abraham ◽  
Santanu Talukder
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
Mass Transport ◽  
Liquid Mass ◽  
Alternating Electric Field ◽  
Kinetics Of ◽  
Kinematics And Kinetics

scholarly journals Interplay of electro-thermo-solutal advection and internal electrohydrodynamics governed enhanced evaporation of droplets

2019 ◽  
Vol 475 (2225) ◽  
pp. 20190046 ◽  
Author(s):  
Vivek Jaiswal ◽  
Purbarun Dhar
Keyword(s):  
Electric Field ◽  
Thermal Effects ◽  
Schmidt Number ◽  
Proposed Model ◽  
Alternating Electric Field ◽  
Image Velocimetry ◽  
Stability Maps ◽  
Kinetics Of ◽  
Evaporation Kinetics

The article experimentally examines and theoretically establishes the influence of electric field on the evaporation kinetics of pendant droplets. It is observed that the evaporation of saline-pendant droplets can be augmented by the application of an external alternating electric field. The evaporation behaviour is modulated by an increase in the field strength and frequency. The classical diffusion driven evaporation model is found insufficient in predicting the improved evaporation rates. The change in surface tension due to field constraint is also unable to explain the observed physics. Consequently, the internal hydrodynamics of the droplet is investigated through particle image velocimetry. The electric field is found to induce enhanced internal advection, which improves the evaporation rates. A scaled analytical model is proposed to quantify the role of internal electrohydrodynamics, electro-thermal and electro-solutal effects. Stability maps reveal that the advection is caused nearly equally by the electro-solutal and electro-thermal effects within the droplet. The model is able to illustrate the influence played by the governing thermal and solutal Marangoni number, the electro-Prandtl and electro-Schmidt number, and the associated electrohydrodynamic number. The magnitude of the internal circulation can be predicted by the proposed model, which validates the proposed mechanism.

scholarly journals Obtaining, structure, microstructure and dielectric characteristics of ceramics and thin films of ferro-piezoelectric materials based on the PZT system

2020 ◽  
Vol 10 (01n02) ◽  
pp. 2060003
Author(s):  
Inna Andryushina ◽  
Anatoliy Pavlenko ◽  
Sergey Zinchenko ◽  
Konstantin Andryushin ◽  
Lidiya Shilkina ◽  
...  
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
Piezoelectric Properties ◽  
Bulk Material ◽  
Piezoelectric Materials ◽  
Hysteresis Loops ◽  
Dielectric Characteristics ◽  
Hard Materials ◽  
Alternating Electric Field ◽  
Capacitance Voltage

This paper presents the results of studies of the structure, microstructure, dependences of the piezoelectric properties on the electric field (dielectric hysteresis loops, reversible nonlinearity, deformation characteristics) and dielectric properties of the ceramic material PCR-13 (based on the PZT system) in the temperature range 300–900[Formula: see text]K and frequencies of an alternating electric field ([Formula: see text]) Hz. The character of the obtained dependences made it possible to attribute PCR-13 to ferro-hard materials. Using the HF cathodic sputtering method, PCR-13 thin films were fabricated on Si (001) substrates. It is shown that they are polycrystalline textured, while in comparison with bulk material, the film contains tensile stresses of the unit cell in the plane of the substrate and compresses in the perpendicular direction with the value [Formula: see text]. The capacitance-voltage characteristics of the Al/PCR-13/Si/Al heterostructure were studied. The reasons for the revealed patterns are discussed.

Formation of Regular Domain Structures in Quenched Ferroelectrics Under the Influence of an External High-frequency Electric Field

2019 ◽  
Vol 9 (3) ◽  
pp. 344-352 ◽  
Author(s):  
L.I. Stefanovich ◽  
O.Y. Mazur ◽  
V.V. Sobolev
Keyword(s):  
Lithium Niobate ◽  
Electric Field ◽  
Domain Structure ◽  
High Frequency ◽  
Evolution Equations ◽  
Regular Domain ◽  
Field Frequency ◽  
Domain Structures ◽  
Alternating Electric Field ◽  
Lithium Niobate Crystals

Introduction: Within the framework of the phenomenological theory of phase transitions of the second kind of Ginzburg-Landau, the kinetics of ordering of a rapidly quenched highly nonequilibrium domain structure is considered using the lithium tantalate and lithium niobate crystals as an example. Experimental: Using the statistical approach, evolution equations describing the formation of the domain structure under the influence of a high-frequency alternating electric field in the form of a standing wave were obtained. Numerical analysis has shown the possibility of forming thermodynamically stable mono- and polydomain structures. It turned out that the process of relaxation of the system to the state of thermodynamic equilibrium can proceed directly or with the formation of intermediate quasi-stationary polydomain asymmetric phases. Results: It is shown that the formation of Regular Domain Structures (RDS) is of a threshold character and occurs under the influence of an alternating electric field with an amplitude less than the critical value, whose value depends on the field frequency. The conditions for the formation of RDSs with a micrometer spatial scale were determined. Conclusion: As shown by numerical studies, the RDSs obtained retain their stability, i.e. do not disappear even after turning off the external electric field. Qualitative analysis using lithium niobate crystals as an example has shown the possibility of RDSs formation in high-frequency fields with small amplitude under resonance conditions

Inhomogeneous Broadening of Photoluminescence Spectra and Kinetics of Nanometer-Thick (Phenethylammonium)2PbI4 Perovskite Thin Films: Implications for Optoelectronics

2021 ◽  
Author(s):  
Vladimir S. Chirvony ◽  
Isaac Suárez ◽  
Jesús Rodríguez-Romero ◽  
Rubén Vázquez-Cárdenas ◽  
Jesus Sanchez-Diaz ◽  
...  
Keyword(s):  
Thin Films ◽  
Inhomogeneous Broadening ◽  
Photoluminescence Spectra ◽  
Kinetics Of
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