A5074813688- Advanced Sensor and Energy Harvesting Materials
- Conducting polymers and applications
- Tactile and Sensory Interactions
- Dielectric materials and actuators
- Innovative Energy Harvesting Technologies
- Green IT and Sustainability
- solar cell performance optimization
- High-Temperature Coating Behaviors
- TiO2 Photocatalysis and Solar Cells
- Surface Roughness and Optical Measurements
- Transition Metal Oxide Nanomaterials
- Pigment Synthesis and Properties
- Advanced MEMS and NEMS Technologies
- Aerogels and thermal insulation
- Corrosion Behavior and Inhibition
- Modular Robots and Swarm Intelligence
- Material Properties and Applications
- Intermetallics and Advanced Alloy Properties
- Computer Graphics and Visualization Techniques
- Fluid Dynamics Simulations and Interactions
- Electrowetting and Microfluidic Technologies
- Copper Interconnects and Reliability
- Silicone and Siloxane Chemistry
- Textile materials and evaluations
- Photovoltaic System Optimization Techniques
Riga Technical University
2015-2025
Materials Science & Engineering
2018-2021
The present study reports the origin of surface charge on polymer upon triboelectrification and is a step forward towards development next generation mechanical energy harvesting systems.
Millions of tonnes polystyrene (PS) are produced annually, with only an estimated 12% being recycled. Herein, the upcycling expanded or foamed PS waste into electromechanically responsive triboelectric laminates (TLs) is described. These TLs possess internal dipoles offering alternative to ferroelectric fluoropolymers, and, when manufactured nanogenerators (TENGs), able generate over 200 V and 12 μA from motion. This energy harvesting enabled by electrospinning alternating layers small large...
Contact electrification and the triboelectric effect are complex processes for mechanical-to-electrical energy conversion, particularly highly deformable polymers. While generating relatively low power density, contact can occur at contact–separation interface between nearly any two polymer surfaces. This ubiquitousness of surfaces enables to be an important phenomenon understand conversion harvesting applications. The mechanism charge generation polymeric materials remains ambiguous, with...
This research investigates the principle of insulating polymeric triboelectrification based on mass transfer mechanism by using nanocomposites experimentally and computationally for efficient development triboelectric energy devices.
Herein, a new paradigm of triboelectric polymers-the laminate-a volumetric material with electromechanical response comparable to the benchmark soft piezoelectric polyvinylidene difluoride is reported. The in laminate arises from aligned dipoles, generated orientation contact electrification laminates bulk volume. dipoles form between sequential bilayers consisting two different electrospun polymer fibers diameter. loose interface fiber ensures friction and charging polymers. electric output...
Triboelectric nanogenerators (TENGs) have been recognized as a key potential solution for powering microdevices by converting mechanical energy and interfacial friction to electricity. The TENG device performance can be enhanced the incorporation of ferroelectric materials, either polymers or ceramic particles, at contact interface. Contact between components interface leads an increased electrostatic induction from piezoelectric dipoles. If polarization adjacent surfaces is inversely...
Triboelectric nanogenerators based on ferroelectric materials exhibit boosted performance due to magnified induction by piezoelectric charges.
It was recently reported that more efficient triboelectric nanogenerator (TENG)-like devices can be prepared using inversely polarized ferroelectric films made of same material as the contacting layers. In present work, a clear correlation between piezoelectric response PVDF/BaTiO3 nanocomposite and performance TENG-like device based on these is demonstrated. This observation explained by magnified electrostatic induction driven charges properties films. A double capacitor model proposed...
Abstract In the present work, contact electrification of polymers that differ in adhesion strength is studied. Electrical current measured along with macroscale contacting‐separation experiments. Additionally, local and roughness are studied atomic force microscopy to get deeper insight into relations between surface properties electrification. Measurements reveal higher charge formed on more adhesive surfaces, thus confirming covalent bond cleavage as a mechanism for polymers. Investigated...
Polymer contact electrification offers the possibility to harvest mechanical energy using lightweight, flexible and low-cost materials, but mechanism itself is still unresolved. Several recent studies confirm heterolytic covalent bond breaking as for surface charge formation. Here it shown that reason formation of by contacting two identical polymers results from fluctuation in irregularities, contacted materials with a greater porosity or roughness differential result generation charge....
Embedding additional ferroelectric dipoles in contacting polymer layers is known to enhance the performance of triboelectricnanogenerator (TENG) devices. However, influence formed between triboelectric surface charges on two films has been ignored all relevant studies. We demonstrate that proper attention alignment distinct present surfaces and composite polymer/BaTiO3 can lead up four times higher energy power density output compared with cases when dipole arrangement mismatched. For...
Tribovoltaic devices are attracting increasing attention as motion-based energy harvesters due to the high local current densities that can be generated. However, while these tribovoltaic being developed, debate remains surrounding their fundamental mechanism. Here, we fabricate thin films from one of world's most common oxides, TiO2, and compare performance under contact with metals varying work functions, areas, applied pressure. The resultant density shows little correlation function...
Over the last decade, triboelectric nanogenerators (TENGs) are proposed as a viable alternative to address impetus for affordable and clean energy. Here, novel, cost-effective granular-based TENG comprising two electrodes covered with HCP monolayers of monodisperse polymer (PMMA, PS, MF-resin) beads diameters ranging between 0.5 10 µm is proposed. These attained in <20 s by employing solvent-free particle rubbing assembly technique on fluorocarbon-coated substrates. The performance...
Glassy polymers show an impressive surge in triboelectric surface charge when crossing their respective<italic>T</italic><sub>g</sub>. In a rubbery state they become softer and more adhesive, therefore heterolysis of polymer bonds material transfer becomes probable.
The tribovoltaic devices have demonstrated an enormous current density output from friction. This has attracted attention, and thus, the device research is expected to grow rapidly, providing mechanical energy harvesting human motion or vibrations power microdevices. Herein, we are demonstrating novel based on W/WO3 Schottky junction enabled by high-energy electrons as in hot-carrier photovoltaic devices. hot carrier injection metal semiconductor been well before light-driven but not for...
TiO 2 three-layer sol-gel films have been deposited on soda-lime silicate glass slides and dried in two different ways to study the effect of drying thin film structure. The structural properties, surface topography photocatalytic activity were studied by X-ray diffraction, atomic force microscopy, analysing degradation methyl orange, respectively. titanium oxide layers at 20 °C before deposition next after final calcination 500 resulted a nanorod array with good activity.
Abstract The main requirement for triboelectric nanogenerator devices is the necessity to have separable or movable parts harvest mechanical energy, thus complicating their integration into energy harvesting systems. Herein, laminates that show a volumetric electromechanical response are introduced, similar intrinsic ferroelectric polymers. composed of stacked bilayer polymer films with different surface properties separated by mesh. This sophisticated design provides dipole alignment across...