Arvydas Palevicius

• Professor
• Professor (Full) at Kaunas University of Technology

This text investigates the bending/buckling behavior of multi-layer asymmetric/symmetric annular and circular graphene plates through the application of the nonlocal strain gradient model. Additionally, the static analysis of multi-sector nanoplates is addressed. By considering the van der Waals interactions among the layers, the higher-order shear...

This article presents research into the feasibility of applying a nonlinear damper of a new conceptual structure. The key component of the damper is a circular membrane with slits that can move in a cylinder filled with viscous fluid. When an external load is applied to the damper, the membrane deforms, opening the slits. The flow of viscous fluid...

Given the multitude of global health concerns, it is crucial to promptly and precisely identify biomarkers like alpha-fetoprotein (AFP) in order to facilitate the early identification and treatment of diverse illnesses, with a special emphasis on cancer. Conventional detection techniques often exhibit limitations in terms of intricacy, temporal req...

Typically, polymer composites and ceramics are used to create biosensors. Materials with properties that are ideal for biosensors and chemical sensors include AgNO3 (silver nitrate), PVDF (polyvinylidene fluoride), and HA (hydroxyapatite). Polyvinylidene fluoride (PVDF) polymer has been widely used in several applications because of its well-known...

Today, microfluidics has become a revolutionary interdisciplinary topic with considerable attention in a wide range of biotechnology applications. In this research work, a numerical investigation of a microfluidic micromixer is carried out using a hybrid actuation approach with different micropillar shapes and gaps. For this purpose, COMSOL Multiph...

Today, microfluidics has become a revolutionary interdisciplinary topic with considerable attention in a wide range of biotechnology applications. In this research work, a numerical investigation of a microfluidic micromixer is carried out using a hybrid actuation approach with different micropillar shapes and gaps. For this purpose, COMSOL Multiph...

Recently, tissue engineering has been revolutionised by the development of 3D-printed scaffolds, which allow one to construct a precise architecture with tailored properties. In this study, three different composite materials were synthesised using a combination of polylactic acid (PLA), polyhydroxyalkanoates (PHA), poly(3-hydroxybutyrate) (PHB) an...

In this context, the nonlinear bending investigation of a sector nanoplate on the elastic foundation is carried out with the aid of the nonlocal strain gradient theory. The governing relations of the graphene plate are derived based on the higher-order shear deformation theory (HSDT) and considering von Karman nonlinear strains. Contrary to the fir...

Photovoltaic systems, such as dye-sensitized solar cells (DSSCs), are one of the useful tools for generating renewable and green energy. To develop this technology, obstacles such as cost and the use of expensive compounds must be overcome. Here, we employed a new MoS2/graphene hybrid or composite instead of platinum in the DSSCs. Furthermore, the...

Corrosion is a harmful processes which by definition is a chemical or ectrochemical reaction between a substance (usually a metal) and the environment which leads to a change in the properties of the substance and has destructive effects. In this study, new composites consisting of Al/WS2/ZnTerp-2TH with 5 and 10 wt.% ZnTerp-2TH were prepared and t...

This article presents the nonlinear investigation of the thermal and mechanical buckling of orthotropic annular/circular single-layer/bilayer nanoplate with the Pasternak and Winkler elastic foundations based on the nonlocal strain gradient theory. The stability equations of the graphene plate are derived using higher-order shear deformation theory...

Much attention has been paid to the surface modification of artificial skin barriers for the treatment of skin tissue damage. Chitosan is one of the natural materials that could be characterized by its biocompatibility. A number of methods for the preparation of chitosan membranes have been described in scientific articles, including solvent castin...

A nonlinear static analysis of a circular/annular nanoplate on the Winkler–Pasternak elastic foundation based on the nonlocal strain gradient theory is presented in the paper. The governing equations of the graphene plate are derived using first-order shear deformation theory (FSDT) and higher-order shear deformation theory (HSDT) with nonlinear vo...

Molding in thermoplastic polymers using ultrasonic hot embossing technology is promising due to its high precision reproducibility. To understand, analyze and apply the formation of polymer microstructures by the ultrasonic hot embossing method, it is necessary to understand dynamic loading conditions. The Standard Linear Solid model (SLS) is a met...

In this study, new composites based on polyvinylidene fluoride (PVDF) were ornamented and prepared with hydroxyapatite (HA) and silver nitride (AgNO3). Taking into account the polarity of the solvent dimethyl sulfoxide, this solvent was used to disperse the particles. The aim of using DMSO was to create amorphous phases and the strong dipoles of th...

In this paper, a novel nanocrystalline composite material of hydroxyapatite (HA)/polyvinyltrimethoxysilane (PVTMS)/iron(II)chloride tetrahydrate (Cl2FeH8-O4) with hexagonal structure is proposed for the fabrication of a gas/temperature sensor. Taking into account the sensitivity of HA to high temperatures, to prevent the collapse and breakdown of b...

In recent years, many research achievements in the field of anodic aluminum oxide (AAO) membranes can be observed. Nevertheless, it is still an interesting research topic due to its high versatility and applications in various fields, such as template-assisted methods, filtration, sensors, etc. Nowadays, miniaturization is an integral part of diffe...

Nanoporous anodic aluminum oxide (AAO) is needed for a variety of purposes due to its unique properties, including high hardness, thermal stability, large surface area, and light weight. Nevertheless, the use of AAO in different applications is limited because of its brittleness. A new design of an electrochemical reactor with a vibrating element f...

This paper presents the development of novel hybrid composites in the presence of filler particles and manufactured using a proposed new fabrication technique. The hybrid composites were fabricated using a basalt and E-glass woven fabric–reinforced epoxy resin matrix combined with graphite powder nanoparticles. Six sets of samples were fabricated u...

Modern day industries are highly focused on the development of bio-inspired hybrid natural fiber composites for lightweight biosensor chips, automobile, and microfluidic applications. In the present research, the mechanical properties and morphological characteristics of alkaline (NaOH)-treated hemp, flax, noil hemp, and noil flax fiber-reinforced...

Polymeric microstructures and microchannels are widely used in biomedical devices, optics, microfluidics and fiber optics. The quality, the shape, the spacing and the curvature of microstructure gratings are influenced by different mechanisms and fabrication techniques used. This paper demonstrates a cost-effective way for patterning high-aspect-ra...

Mg-based alloys have several suitable properties for biomaterials, but they have major problems of being less antibacterial and have a low mechanical strength. To solve these problems, a new combination of Ag/Zn/Mg was prepared in this study, where the presence of Zn and Ag can help to increase the bioactivity. The use of 5 wt% polymers consisting...

The impact of matrix material on the mechanical properties of natural-fiber-reinforced hybrid composites was studied by comparing their experimental, and numerical analysis results. In the present work hemp and flax fibers were used as reinforcement and epoxy resin and ecopoxy resin along with hardener were used as matrix materials. To study the in...

In this study, we have designed and investigated four new low-emitting fluorescent dyes consisting of sulfonamide derivatives with substitution groups in the LUMO moiety. In these dyes, sulfonamide linked with pyrazole group played an important role in complementing the acceptor moieties. The optical properties of dyes were evaluated by the UV–VIS...

In this study, nanocomposites consisting of TiO2-Ag-Ce with stoichiometric ratio of 1, 3 and 5 wt.% Ag and 10 wt.% Ce (constant) as photocatalyst were prepared and investigated. Based on the crystallite phase, the thermal calcination temperature was set at 500 °C. X-ray diffraction, FE-SEM, EDS analysis, TEM and FTIR were used to characterize the s...

Anodic nanoporous alumina is becoming increasingly used as a material for the fabrication of nano and micro devices in a biomedical equipment, drug delivery system, corrosion resistive coatings, and range of industries. Because of its ease of production and low manufacturing cost, nanoporous alumina is becoming a more essential nanomaterial templet...

Nanocomposite consisting of 5 mol% crystalline CuI-doped hydroxyapatite (HA) was prepared for the first time by facile chemical method and calcined at different temperatures such as 300 °C, 500 °C, 700 °C and 900 °C. In this study, HA played a role as the matrix and CuI was the reinforcement. The effect of calcination temperature on XRD pattern, TE...

Composites with natural fibers as reinforcements are playing a vital role in recent developments. The present work deals with the fabrication of okra and empty fruit bunch banana fiber polyester matrix composites with varying reinforcement content (5%, 10%, and 15%). Composites were fabricated by using the hand layup technique. After the fabricatio...

Nanomembrane is an independent structure with a thickness of 1–100 nm and with much large lateral dimensions. Due to the unique properties of nanomembranes, research on the category of structures is valuable. Furthermore, nanomembranes have received a lot of attention from scientists because those types of structures can be used in various bioengin...

In this study, we designed, engineered and investigated two new thermally activated delayed fluorescence (TADF) dyes obtained from D–A–D′ type, consisted of 2-(9H-carbazol-9-yl)-3-(3-methoxy-9H-carbazol-9-yl)-9H-xanthen and 2-(3,6-di-tert-butyl-9H-carbazol-9-yl)-3-(3-methoxy -9H-carbazol-9-yl)-9H-xanthen. In these dyes, xanthen derivative and carba...

Taking into account X-ray diffraction, one of the well-known methods for calculating the stress-strain of crystals is Williamson-Hall (W–H). The W-H method has three models, namely (1) Uniform deformation model (UDM); (2) Uniform stress deformation model (USDM); and (3) Uniform deformation energy density model (UDEDM). The USDM and UDEDM models are...

Recently, researchers have focused on the biocompatibility and mechanical properties of highly porous structures of biomaterials products. Porous composites are a new category of bioengineering that possess excellent functional and structural properties. In this study, the physical and mechanical properties of prepared doped silver (Ag)-hydroxyapat...

Calcium titanate-CaTiO3 (perovskite) has been used in various industrial applications due to its dopant/doping mechanisms. Manipulation of defective grain boundaries in the structure of perovskite is essential to maximize mechanical properties and stability; therefore, the structure of perovskite has attracted attention, because without fully under...

In recent years, natural fiber reinforced polymer composites have gained much attention over synthetic fiber composites because of their many advantages such as low-cost, light in weight, non-toxic, non-abrasive, and biodegradable properties. Many researchers have found interest in using epoxy resin for composite fabrication over other thermosettin...

The current trend in nano/micro structured array fabrication for a variety of applications in microsystems development nanoporous anodic alumina (Al2O3) gained tremendous attention. In this research paper, Freestanding (FS) nanoporous anodic alumina were fabricated using a two-step anodization technique. Nanoporous honeycomb structure having an ave...

This research paper is concentrated on the design of biologically compatible lead-free piezoelectric composites which may eventually replace traditional lead zirconium titanate (PZT) in micromechanical fluidics, the predominantly used ferroelectric material today. Thus, a lead-free barium–calcium zirconate titanate (BCZT) composite was synthesized,...

Calcium titanate-CaTiO3(perovskite) has been used in various industrial applications due to its dopant/doping mechanisms. Manipulation of defective grain boundaries in the structure of perovskite is essential to maximize mechanical properties and stability; therefore, the structure of perovskite has attracted attention, because without fully unders...

Natural fibers have many advantages over synthetic fibers due to their lightness, low cost, biodegradability, and abundance in nature. The demand for natural fiber hybrid composites in various applications has increased recently, because of its promising mechanical properties. In this research work, the mechanical and wettability properties of rein...

Young's modulus (E) is one of the most important parameters in the mechanical properties of solid materials. Young's modulus is proportional to the stress and strain values. There are several experimental and theoretical methods for gaining Young's modulus values, such as stress-strain curves in compression and tensile tests, electromagnetic-acoust...

The present review article provides an overview of the properties of various natural and synthetic fibers for the fabrication of pure natural composites and the combination of both natural/synthetic fibers-based hybrid composites, bio-based resins, various fabrication techniques, chemical and mechanical properties of fibers, the effect of chemical...

The main aim of the paper is to present replication of computer-generated microstructure on the piezoelectric nano composites with PZT and PMMA (Polymethyl methacrylate) and fabrication of the nanoporous aluminum oxide membrane with nanopores. In this paper computer-generated hologram is produced and replicated on the piezoelectric nano composites...

We report on a comparison of methods based on XRD patterns for calculating crystal size. In this case, XRD peaks were extracted from hydroxyapatite obtained from cow, pig, and chicken bones. Hydroxyapatite was synthesized through the thermal treatment of natural bones at 950 °C. XRD patterns were selected by adjustment of X-Pert software for each m...

A concept of a nanoporous anodic aluminum oxide (AAO) membrane as a vibro-active micro/nano-filter in a micro hydro mechanical system for the filtration, separation, and manipulation of bioparticles is reported in this paper. For the fabrication of a nanoporous AAO, a two-step mild anodization (MA) and hard anodization (HA) technique was used. Atom...

The main aim of the paper is to prepare a nonporous aluminum oxide membrane which will be used as a micro/Nano filter in biomedical micro hydraulic device or system by using piezoelectric material actuator acting as a vibroactive member to excite the aluminum oxide membrane. In order to identify the aluminum oxide membrane could be used as active n...

The main purpose of the paper is to investigate the hydrophobic properties of piezoelectric composites that could be used in biomedical micro-hydraulic devices. Hydrophobicity plays an important role, and gives less obstruction to the water, which is the major reason behind the lower efficiency of electrical devices, particularly for piezoelectric...

The paper is dedicated to analysis, practical exploitation of sonotrode, whose fundament is multilayer actuator in experiments of mechanical hot imprint. The goal is to compare the quality of microstructures, created by using vibration based on multilayer actuator. Numerical modelling and experimental analysis is performed in order to find resonant...

In this article, thermal imprint process for replication of high-quality microstructures on the surface of polymer is investigated. Vibrations has been previously employed as an additional measure to enhance the replicability of microstructure into the pre-heated polymer. On the other hand, polymer behavior under the action of vibrations is not suf...

This paper reviews recent investigations and achievements in the design of controllable functional components for improving microfluidic systems, its effectiveness, and functionality. The main purpose was to design novel microstructures with piezoelectric properties (microresonators), which enable one to control the effectiveness of fluid flow in m...

The investigation of the high frequency vibrations of the fluid is an important problem in the design of microfluidic devices (periodic microstructures). Laser interferometric methods such as time average holography, high speed double expose holography or laser light diffraction allow to do analysis of high speed fluid flow and dosing or vibration...

The aim of this paper is to propose a novel structure glucose sensor which makes glucose level measurement system more convenient, increases measurement accuracy and gets the sensor that can be manufactured applying cheap manufacture processes. The main focus is made on the design of viscoelastic cantilever type sensors with the embedded piezo-acti...

Health care industry has a growing need for advanced tools that enables the discovery the existence or concentration of biological analytes. In this article a concept of novel cantilever-type microsystem platform in the field of biomechanics using optical technique of image encryption and communication scheme based on computer generated holography...

The main aim of this paper is to create nanoporouse aluminium oxide membrane which could be used as vibroactive nanofilter in biomedical micro hydraulic devices. This research paper covers the experimental setup of nanoporouse aluminium oxide membrane fabrication and the investigations of its chemical and surface properties. A custom-made anodizati...

Microresonators are fundamental components integrated in a hosts of MEMS applications: safety and stability systems, biometric sensors, switches, mechanical filters, micromirror devices, material characterization, gyroscopes, etc. A constituent part of the microresonator is a diffractive optical element (DOE). Different methods and materials are us...

Microresonators are fundamental components integrated in hosts of MEMS applications: covering the automotive sector, the telecommunication industry, electronic equipment for surface/material characterization and motion sensing, and etc. The aim of this paper is to investigate the mechanical and electrical properties of PZT film fabricated with thre...

Blood pressure is the first assessment of blood flow and still is the easiest parameter to measure. Examination of wrist radial pulse is non-invasive diagnostic method, which takes a very important place in traditional Chinese medicine. Hence, it lacks the consistency and reliability, which limits practical application in clinical medicine. Thus, t...

Accurate measurements of the dynamics of the human body begins with the measurement data by filtering the acceleration signal evaluation taking into account the different types of human daily physical activity. Considering acceleration measuring device attached several location areas are defined on the body. The methodology of the design of micro a...

Piezoelectric composite material whose basic element is PZT is developed. It allows controlling the optical parameters of the diffraction grating, which is imprinted in it. In addition, the sensitivity of the designed element is increased using silver nanoparticles, thus surface plasmon resonance effect appears. The developed technological route of...

The theoretical and experimental methods for the investigation of microsystems multi physic processes are presented. The FEM method for the analysis of MEMS in digital environment in combination with experimental data from holographic interferometry is developed. Numerical–experimental method for evaluation of geometrical parameters and their usage...

This book presents the most important aspects of analysis of dynamical processes taking place on the human body surface. It provides an overview of the major devices that act as a prevention measure to boost a person‘s motivation for physical activity. A short overview of the most popular MEMS sensors for biomedical applications is given. The devel...

With increasing technical requirements in the design of microresonators, the development of new techniques for lightweight, simple, and inexpensive components becomes relevant. Lead zirconate titanate (PZT) is a powerful tool in the formation of these components, allowing a self-actuation or self-sensing capability. Different fabrication methods le...

The focus of the paper is dynamic investigation and practical application of two different vibroactive pads: concentrator type vibroactive pad and vibroactive pad with spring, whose purpose is improve the quality of microstructure, created by the method of hot imprint. The goal is to find out operating frequencies of vibroactive pads, where the ent...

In the present research, surface relief diffraction gratings were fabricated and investigated. The purpose of this research was to determine the collection of parameters, which influence the diffraction efficiency most positively. For replication process ultrasonic thermal embossing was selected with different manufacturing regimes (time, pressure,...

The aim of this paper is to develop and investigate MOEMS displacement-pressure sensor for biological information monitoring. Developing computational periodical microstructure models using COMSOL Multiphysics modeling software for modal and shape analysis and implementation of these results for design MOEMS displacement-pressure sensor for biologi...

Micro-resonators are fundamental components integrated in a hosts of MEMS applications: safety and stability systems, biometric sensors, switches, mechanical filters, micro-mirror devices, material characterization, gyroscopes, etc. A constituent part of the micro-resonator is a diffractive optical element (DOE). Different methods and materials are...

The main focus of the paper is the development of technological route of the production of complex 3D microstructure, from designing it by the method of computer generated holography till its physical 3D patterning by exploiting the process of electron beam lithography and thermal replication which is used for biomedical application. A phase data o...

The main focus of the paper is the development of technological process for the production of complex 3D microstructure, from designing it by using computer generated holography to its physical 3D patterning by exploiting the process of electron beam lithography. The logo image was chosen for numerical generation, which was performed by using Gerch...

A novel cantilever type piezoelectric sensing element was developed. Cost-effective and simple fabrication design allows the use of this element for various applications in the areas of biomedicine, pharmacy, environmental analysis and biosensing. This paper proposes a novel piezoelectric composite material whose basic element is PZT and a sensing...