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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 directly related to the modulus of elasticity (E). Young’s modulus is a key parameter in engineering design and materials development. Young’s modulus is considered in USDM and UDEDM models, but in all previous studies, researchers used the average values of Young’s modulus or they calculated Young’s modulus only for a sharp peak of an XRD pattern or they extracted Young’s modulus from the literature. Therefore, these values are not representative of all peaks derived from X-ray diffraction; as a result, these values are not estimated with high accuracy. Nevertheless, in the current study, the W-H method is used considering the all diffracted planes of the unit cell and super cells (2 × 2 × 2) of Hydroxyapatite (HA), and a new method with the high accuracy of the W-H method in the USDM model is presented to calculate stress (σ) and strain (ε). The accounting for the planar density of atoms is the novelty of this work. Furthermore, the ultrasonic pulse-echo test is performed for the validation of the novelty assumptions.
Marzieh Rabiei; Arvydas Palevicius; Amir Dashti; Sohrab Nasiri; Ahmad Monshi; Akram Doustmohammadi; Andrius Vilkauskas; Giedrius Janusas. X-ray Diffraction Analysis and Williamson-Hall Method in USDM Model for Estimating More Accurate Values of Stress-Strain of Unit Cell and Super Cells (2 × 2 × 2) of Hydroxyapatite, Confirmed by Ultrasonic Pulse-Echo Test. Materials 2021, 14, 2949 .
AMA StyleMarzieh Rabiei, Arvydas Palevicius, Amir Dashti, Sohrab Nasiri, Ahmad Monshi, Akram Doustmohammadi, Andrius Vilkauskas, Giedrius Janusas. X-ray Diffraction Analysis and Williamson-Hall Method in USDM Model for Estimating More Accurate Values of Stress-Strain of Unit Cell and Super Cells (2 × 2 × 2) of Hydroxyapatite, Confirmed by Ultrasonic Pulse-Echo Test. Materials. 2021; 14 (11):2949.
Chicago/Turabian StyleMarzieh Rabiei; Arvydas Palevicius; Amir Dashti; Sohrab Nasiri; Ahmad Monshi; Akram Doustmohammadi; Andrius Vilkauskas; Giedrius Janusas. 2021. "X-ray Diffraction Analysis and Williamson-Hall Method in USDM Model for Estimating More Accurate Values of Stress-Strain of Unit Cell and Super Cells (2 × 2 × 2) of Hydroxyapatite, Confirmed by Ultrasonic Pulse-Echo Test." Materials 14, no. 11: 2949.
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)-hydroxyapatite (HA) by the mechanochemical and spark plasma sintering (SPS) methods were investigated. The influence of dopant on phase formation, structural properties, mechanical properties and morphological characteristics was investigated. Furthermore, in this case, as a new approach to produce a porous scaffold with an average size of >100 µm, the hair band was used as a mold. According to the Monshi–Scherrer method, the crystal size of scaffold was calculated 38 ± 2 nm and this value was in the good agreement with average value from transmission electron microscopy (TEM) analysis. In addition, the stress–strain compression test of scaffold was considered, and the maximum value of compressive strength was recorded ~15.71 MPa. Taking into account the XRD, TEM, Fourier-transform infrared (FTIR), scanning electron microscope (SEM) and energy dispersive X-Ray analysis (EDAX) analysis, the prepared scaffold was bioactive and the effects of doped Ag-HA and the use of polyvinyltrimethoxysilane (PVTMS) as an additive were desirable. The results showed that the effect of thermal treatment on composed of Ag and HA were impressive while no change in transformation was observed at 850 °C. In addition, PVTMS plays an important role as an additive for preventing the decomposition and creating open-microporous in the scaffold that these porosities can be helpful for increasing bioactivity.
Marzieh Rabiei; Arvydas Palevicius; Reza Ebrahimi-Kahrizsangi; Sohrab Nasiri; Andrius Vilkauskas; Giedrius Janusas. New Approach for Preparing In Vitro Bioactive Scaffold Consisted of Ag-Doped Hydroxyapatite + Polyvinyltrimethoxysilane. Polymers 2021, 13, 1695 .
AMA StyleMarzieh Rabiei, Arvydas Palevicius, Reza Ebrahimi-Kahrizsangi, Sohrab Nasiri, Andrius Vilkauskas, Giedrius Janusas. New Approach for Preparing In Vitro Bioactive Scaffold Consisted of Ag-Doped Hydroxyapatite + Polyvinyltrimethoxysilane. Polymers. 2021; 13 (11):1695.
Chicago/Turabian StyleMarzieh Rabiei; Arvydas Palevicius; Reza Ebrahimi-Kahrizsangi; Sohrab Nasiri; Andrius Vilkauskas; Giedrius Janusas. 2021. "New Approach for Preparing In Vitro Bioactive Scaffold Consisted of Ag-Doped Hydroxyapatite + Polyvinyltrimethoxysilane." Polymers 13, no. 11: 1695.
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 bio-degradable properties. Many researchers have found interest in using epoxy resin for composite fabrication over other thermosetting and thermoplastic polymers due to its dimensional stability and mechanical properties. In this research work, the mechanical and moisture properties of Caryota and sisal fiber-reinforced epoxy resin hybrid composites were investigated. The main objective of these studies is to develop hybrid composites and exploit their importance over single fiber composites. The Caryota and sisal fiber reinforced epoxy resin composites were fabricated by using the hand lay-up technique. A total of five different samples (40C/0S, 25C/15S, 20C/20S, 15C/25S, 0C/40S) were developed based on the rule of hybridization. The samples were allowed for testing to evaluate their mechanical, moisture properties and the morphology was studied by using the scanning electron microscope analysis. It was observed that hybrid composites have shown improved mechanical properties over the single fiber (Individual fiber) composites. The moisture studies stated that all the composites were responded to the water absorption but single fiber composites absorbed more moisture than hybrid composites.
Ayyappa Atmakuri; Arvydas Palevicius; Lalitnarayan Kolli; Andrius Vilkauskas; Giedrius Janusas. Development and Analysis of Mechanical Properties of Caryota and Sisal Natural Fibers Reinforced Epoxy Hybrid Composites. Polymers 2021, 13, 864 .
AMA StyleAyyappa Atmakuri, Arvydas Palevicius, Lalitnarayan Kolli, Andrius Vilkauskas, Giedrius Janusas. Development and Analysis of Mechanical Properties of Caryota and Sisal Natural Fibers Reinforced Epoxy Hybrid Composites. Polymers. 2021; 13 (6):864.
Chicago/Turabian StyleAyyappa Atmakuri; Arvydas Palevicius; Lalitnarayan Kolli; Andrius Vilkauskas; Giedrius Janusas. 2021. "Development and Analysis of Mechanical Properties of Caryota and Sisal Natural Fibers Reinforced Epoxy Hybrid Composites." Polymers 13, no. 6: 864.
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 understanding the perovskite structure and diffracted planes, dopant/doping mechanisms cannot be understood. In this study, the areas and locations of atoms and diffracted planes were designed and investigated. In this research, the relationship between Young’s modulus and planar density of unit cell, super cells (2 × 2 × 2) and symmetry cells of nano CaTiO3 is investigated. Elastic constant, elastic compliance and Young’s modulus value were recorded with the ultrasonic pulse-echo technique. The results were C11 = 330.89 GPa, C12 = 93.03 GPa, C44 = 94.91 GPa and E = 153.87 GPa respectively. Young’s modulus values of CaTiO3 extracted by planar density were calculated 162.62 GPa, 151.71 GPa and 152.21 GPa for unit cell, super cells (2 × 2 × 2) and symmetry cells, respectively. Young’s modulus value extracted by planar density of symmetry cells was in good agreement with Young’s modulus value measured via ultrasonic pulse-echo.
Marzieh Rabiei; Arvydas Palevicius; Sohrab Nasiri; Amir Dashti; Andrius Vilkauskas; Giedrius Janusas. Relationship between Young’s Modulus and Planar Density of Unit Cell, Super Cells (2 × 2 × 2), Symmetry Cells of Perovskite (CaTiO3) Lattice. Materials 2021, 14, 1258 .
AMA StyleMarzieh Rabiei, Arvydas Palevicius, Sohrab Nasiri, Amir Dashti, Andrius Vilkauskas, Giedrius Janusas. Relationship between Young’s Modulus and Planar Density of Unit Cell, Super Cells (2 × 2 × 2), Symmetry Cells of Perovskite (CaTiO3) Lattice. Materials. 2021; 14 (5):1258.
Chicago/Turabian StyleMarzieh Rabiei; Arvydas Palevicius; Sohrab Nasiri; Amir Dashti; Andrius Vilkauskas; Giedrius Janusas. 2021. "Relationship between Young’s Modulus and Planar Density of Unit Cell, Super Cells (2 × 2 × 2), Symmetry Cells of Perovskite (CaTiO3) Lattice." Materials 14, no. 5: 1258.
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, its crystalline structure and size, surface morphology, chemical, and piezoelectric properties were analyzed, together with the investigations done in variation of composite thin film thickness and its effect on the element properties. Four elements with different thicknesses of BCZT layers were fabricated and investigated in order to design a functional acoustophoresis micromechanical fluidic element, based on bulk acoustic generation for particle control technologies. Main methods used in this research were as follows: FTIR and XRD for evaluation of chemical and phase composition; SEM—for surface morphology; wettability measurements were used for surface free energy evaluation; a laser triangular sensing system—for evaluation of piezoelectric properties. XRD results allowed calculating the average crystallite size, which was 65.68 Å3 confirming the formation of BCZT nanoparticles. SEM micrographs results showed that BCZT thin films have some porosities on the surface with grain size ranging from 0.2 to 7.2 µm. Measurements of wettability showed that thin film surfaces are partially wetting and hydrophilic, with high degree of wettability and strong solid/liquid interactions for liquids. The critical surface tension was calculated in the range from 20.05 to 27.20 mN/m. Finally, investigations of piezoelectric properties showed significant results of lead-free piezoelectric composite, i.e., under 5 N force impulse thin films generated from 76 mV up to 782 mV voltages. Moreover, an experimental analysis showed that a designed lead-free BCZT element creates bulk acoustic waves and allows manipulating bio particles in this fluidic system.
Tomas Janusas; Sigita Urbaite; Arvydas Palevicius; Sohrab Nasiri; Giedrius Janusas. Biologically Compatible Lead-Free Piezoelectric Composite for Acoustophoresis Based Particle Manipulation Techniques. Sensors 2021, 21, 483 .
AMA StyleTomas Janusas, Sigita Urbaite, Arvydas Palevicius, Sohrab Nasiri, Giedrius Janusas. Biologically Compatible Lead-Free Piezoelectric Composite for Acoustophoresis Based Particle Manipulation Techniques. Sensors. 2021; 21 (2):483.
Chicago/Turabian StyleTomas Janusas; Sigita Urbaite; Arvydas Palevicius; Sohrab Nasiri; Giedrius Janusas. 2021. "Biologically Compatible Lead-Free Piezoelectric Composite for Acoustophoresis Based Particle Manipulation Techniques." Sensors 21, no. 2: 483.
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 reinforced natural fiber epoxy resin hybrid composites were investigated. The main aim of this research work is the fabrication of hybrid composites and exploit its importance over individual fiber composites. The composites were fabricated based on the rule of hybridization mixture (0.4 wf) of two fibers using sets of either hemp and flax or banana and pineapple, each set with 40 wt%, as well as four single fiber composites, 40 wt% each, as reinforcement and epoxy resin as matrix material. A total of two sets (hemp/flax and banana/pineapple) of hybrid composites were fabricated by using a hand layup technique. One set as 40H/0F, 25H/15F, 20H/20F, 15H/25F, 0H/40F, and the second one as 40B/0P, 25B/15P, 20B/20P, 15B/25P, 0B/40P weight fraction ratios. The fabricated composites were allowed for testing to examine its mechanical, wettability, and moisture properties. It has been observed that, in both cases, hybrid composites showed improved mechanical properties when compared to the individual fiber composites. The wettability test was carried out by using the contact angle measurement technique. All composites in both cases, hybrid or single showed contact angle less than 90°, which is associated with the composite hydrophilic surface properties. The moisture analysis stated that all the composites responded for moisture absorption up to 96 h and then remained constant in both cases. Hybrid composites absorbed less moisture than individual fiber composites.
Ayyappa Atmakuri; Arvydas Palevicius; Madhusudan Siddabathula; Andrius Vilkauskas; Giedrius Janusas. Analysis of Mechanical and Wettability Properties of Natural Fiber-Reinforced Epoxy Hybrid Composites. Polymers 2020, 12, 2827 .
AMA StyleAyyappa Atmakuri, Arvydas Palevicius, Madhusudan Siddabathula, Andrius Vilkauskas, Giedrius Janusas. Analysis of Mechanical and Wettability Properties of Natural Fiber-Reinforced Epoxy Hybrid Composites. Polymers. 2020; 12 (12):2827.
Chicago/Turabian StyleAyyappa Atmakuri; Arvydas Palevicius; Madhusudan Siddabathula; Andrius Vilkauskas; Giedrius Janusas. 2020. "Analysis of Mechanical and Wettability Properties of Natural Fiber-Reinforced Epoxy Hybrid Composites." Polymers 12, no. 12: 2827.
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-acoustic resonance, ultrasonic pulse echo and density functional theory (DFT) in different basis sets. Apparently, preparing specimens for measuring Young’s modulus through the experimental methods is not convenient and it is time-consuming. In addition, for calculating Young’s modulus values by software, presumptions of data and structures are needed. Therefore, this new method for gaining the Young’s modulus values of crystalline materials is presented. Herein, the new method for calculating Young’s modulus of crystalline materials is extracted by X-ray diffraction. In this study, Young’s modulus values were gained through the arbitrary planes such as random (hkl) in the research. In this study, calculation of Young’s modulus through the relationship between elastic compliances, geometry of the crystal lattice and the planar density of each plane is obtained by X-ray diffraction. Sodium chloride (NaCl) with crystal lattices of FCC was selected as the example. The X-ray diffraction, elastic stiffness constant and elastic compliances values have been chosen by the X’Pert software, literature and experimental measurements, respectively. The elastic stiffness constant and Young’s modulus of NaCl were measured by the ultrasonic technique and, finally, the results were in good agreement with the new method of this study. The aim of the modified Williamson–Hall (W–H) method in the uniform stress deformation model (USDM) utilized in this paper is to provide a new approach of using the W–H equation, so that a least squares technique can be applied to minimize the sources of errors.
Marzieh Rabiei; Arvydas Palevicius; Amir Dashti; Sohrab Nasiri; Ahmad Monshi; Andrius Vilkauskas; Giedrius Janusas. Measurement Modulus of Elasticity Related to the Atomic Density of Planes in Unit Cell of Crystal Lattices. Materials 2020, 13, 4380 .
AMA StyleMarzieh Rabiei, Arvydas Palevicius, Amir Dashti, Sohrab Nasiri, Ahmad Monshi, Andrius Vilkauskas, Giedrius Janusas. Measurement Modulus of Elasticity Related to the Atomic Density of Planes in Unit Cell of Crystal Lattices. Materials. 2020; 13 (19):4380.
Chicago/Turabian StyleMarzieh Rabiei; Arvydas Palevicius; Amir Dashti; Sohrab Nasiri; Ahmad Monshi; Andrius Vilkauskas; Giedrius Janusas. 2020. "Measurement Modulus of Elasticity Related to the Atomic Density of Planes in Unit Cell of Crystal Lattices." Materials 13, no. 19: 4380.
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 treatment and the influence of nanoparticles on the composite materials. Natural fibers are becoming more popular and attractive to researchers, with satisfactory results, due to their availability, ease of fabrication, cost-effectiveness, biodegradable nature and being environmentally friendly. Hybrid composites made up of two different natural fibers under the same matrix material are more popular than a combination of natural and synthetic fibers. Recent studies relevant to natural fiber hybrid composites have stated that, due to their biodegradability and the strength of individual fibers causing an impact on mechanical properties, flame retardancy and moisture absorption, natural fibers need an additional treatment like chemical treatment for the fibers to overcome those drawbacks and to enhance their better properties. The result of chemical treatment on composite material properties such as thermal, mechanical and moisture properties was studied. Researchers found that the positive influence on overall strength by placing the filler materials (nanoparticles) in the composite materials. Hybrid composites are one of the fields in polymer science that are attracting consideration for various lightweight applications in a wide range of industries such as automobile, construction, shipping, aviation, sports equipment, electronics, hardware and biomedical sectors.
Ayyappa Atmakuri; Arvydas Palevicius; Andrius Vilkauskas; Giedrius Janusas. Review of Hybrid Fiber Based Composites with Nano Particles—Material Properties and Applications. Polymers 2020, 12, 2088 .
AMA StyleAyyappa Atmakuri, Arvydas Palevicius, Andrius Vilkauskas, Giedrius Janusas. Review of Hybrid Fiber Based Composites with Nano Particles—Material Properties and Applications. Polymers. 2020; 12 (9):2088.
Chicago/Turabian StyleAyyappa Atmakuri; Arvydas Palevicius; Andrius Vilkauskas; Giedrius Janusas. 2020. "Review of Hybrid Fiber Based Composites with Nano Particles—Material Properties and Applications." Polymers 12, no. 9: 2088.
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 by using thermal replication process in the form of micro channels. Nanoporous aluminum oxide membrane fabricated with two step anodization by using custom experimental setup and hexagonal pores with 80 nm diameter and 110 nm interpore distance.
Y. Patel; C. Justas; V. Naginevičius; A. Palevicius. Replicated Computer Generated Microstructure onto Piezoelectric Nanocomposite and Nanoporous Aluminum Oxide Membranes Usage in Microfluidics. Nanomaterials for Security 2020, 235 -246.
AMA StyleY. Patel, C. Justas, V. Naginevičius, A. Palevicius. Replicated Computer Generated Microstructure onto Piezoelectric Nanocomposite and Nanoporous Aluminum Oxide Membranes Usage in Microfluidics. Nanomaterials for Security. 2020; ():235-246.
Chicago/Turabian StyleY. Patel; C. Justas; V. Naginevičius; A. Palevicius. 2020. "Replicated Computer Generated Microstructure onto Piezoelectric Nanocomposite and Nanoporous Aluminum Oxide Membranes Usage in Microfluidics." Nanomaterials for Security , no. : 235-246.
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 method and for calculating the size of the crystals. Methods consisted of Scherrer (three models), Monshi–Scherrer, three models of Williamson–Hall (namely the Uniform Deformation Model (UDM), the Uniform Stress Deformation Model (USDM), and the Uniform Deformation Energy Density Model (UDEDM)), Halder–Wanger (H-W), and the Size Strain Plot Method (SSP). These methods have been used and compared together. The sizes of crystallites obtained by the XRD patterns in each method for hydroxyapatite from cow, pig, and chicken were 1371, 457, and 196 nm in the Scherrer method when considering all of the available peaks together (straight line model). A new model (straight line passing the origin) gave 60, 60, and 53 nm, which shows much improvement. The average model gave 56, 58, and 52 nm, for each of the three approaches, respectively, for cow, pig, and chicken. The Monshi–Scherrer method gave 60, 60, and 57 nm. Values of 56, 62, and 65 nm were given by the UDM method. The values calculated by the USDM method were 60, 62, and 62 nm. The values of 62, 62, and 65 nm were given by the UDEDM method for cow, pig, and chicken, respectively. Furthermore, the crystal size value was 4 nm for all samples in the H-W method. Values were also calculated as 43, 62, and 57 nm in the SSP method for cow, pig, and chicken tandemly. According to the comparison of values in each method, the Scherrer method (straight line model) for considering all peaks led to unreasonable values. Nevertheless, other values were in the acceptable range, similar to the reported values in the literature. Experimental analyses, such as specific surface area by gas adsorption (Brunauer–Emmett–Teller (BET)) and Transmission Electron Microscopy (TEM), were utilized. In the final comparison, parameters of accuracy, ease of calculations, having a check point for the researcher, and difference between the obtained values and experimental analysis by BET and TEM were considered. The Monshi–Scherrer method provided ease of calculation and a decrease in errors by applying least squares to the linear plot. There is a check point for this line that the slope must not be far from one. Then, the intercept gives the most accurate crystal size. In this study, the setup of values for BET (56, 52, and 49 nm) was also similar to the Monshi–Scherrer method and the use of it in research studies of nanotechnology is advised.
Marzieh Rabiei; Arvydas Palevicius; Ahmad Monshi; Sohrab Nasiri; Andrius Vilkauskas; Giedrius Janusas. Comparing Methods for Calculating Nano Crystal Size of Natural Hydroxyapatite Using X-Ray Diffraction. Nanomaterials 2020, 10, 1627 .
AMA StyleMarzieh Rabiei, Arvydas Palevicius, Ahmad Monshi, Sohrab Nasiri, Andrius Vilkauskas, Giedrius Janusas. Comparing Methods for Calculating Nano Crystal Size of Natural Hydroxyapatite Using X-Ray Diffraction. Nanomaterials. 2020; 10 (9):1627.
Chicago/Turabian StyleMarzieh Rabiei; Arvydas Palevicius; Ahmad Monshi; Sohrab Nasiri; Andrius Vilkauskas; Giedrius Janusas. 2020. "Comparing Methods for Calculating Nano Crystal Size of Natural Hydroxyapatite Using X-Ray Diffraction." Nanomaterials 10, no. 9: 1627.
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. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) were used to analyze the surface morphology of nanoporous AAO. A nanoporous structure with a pore diameter in the range of 50–90 nm, an interpore distance of 110 nm, and an oxide layer thickness of 0.12 mm with 60.72% porosity was obtained. Fourier-transform infrared spectroscopy (FTIR) and energy-dispersive X-ray spectroscopy (EDS) were employed to evaluate AAO chemical properties. The obtained results showed that the AAO structure is of hexagonal symmetry and showed where Al2O3 is dominant. The hydrophobic properties of the nanoporous surface were characterized by water contact angle measurement. It was observed that the surface of the nanoporous AAO membrane is hydrophilic. Furthermore, to determine whether a nanomembrane could function as a vibro-active nano filter, a numerical simulation was performed using COMSOL Multiphysics 5.4 (COMSOL Inc, Stockholm, Sweden). Here, a membrane was excited at a frequency range of 0–100 kHz for surface acoustics wave (SAW) distribution on the surface of the nanoporous AAO using a PZT 5H cylinder (Piezo Hannas, Wuhan, China). The SAW, standing acoustic waves, and travelling acoustic waves of different wavelengths were excited to the fabricated AAO membrane and the results were compared with experimental ones, obtained from non-destructive testing method 3D scanning vibrometer (PSV-500-3D-HV, Polytec GmbH, Waldbronn, Germany) and holographic interferometry system (PRISM, Hy-Tech Forming Systems (USA), Phoenix, AZ, USA). Finally, a simulation of a single nanotube was performed to analyze the acoustic pressure distribution and time, needed to center nanoparticles in the nanotube.
Yatinkumar Patel; Giedrius Janusas; Arvydas Palevicius; Andrius Vilkauskas. Development of Nanoporous AAO Membrane for Nano Filtration Using the Acoustophoresis Method. Sensors 2020, 20, 3833 .
AMA StyleYatinkumar Patel, Giedrius Janusas, Arvydas Palevicius, Andrius Vilkauskas. Development of Nanoporous AAO Membrane for Nano Filtration Using the Acoustophoresis Method. Sensors. 2020; 20 (14):3833.
Chicago/Turabian StyleYatinkumar Patel; Giedrius Janusas; Arvydas Palevicius; Andrius Vilkauskas. 2020. "Development of Nanoporous AAO Membrane for Nano Filtration Using the Acoustophoresis Method." Sensors 20, no. 14: 3833.
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 frequency of the sonotrode. Having operating frequency, sonotrode applied in mechanical hot imprint process. Microstructures are created on the surface of polycarbonate; the only process variable is vibration. Two types of microstructure quality measurements are performed: measurement of diffraction efficiency, optical microscopy in order to examine quality of replica
Amer Sodah; Arvydas Palevicius; Giedrius Janusas; Paulius Palevicius; Yatinkumar Patel. Numerical and Experimental Investigation of Sonotrode for Formation of Piezocomposite Functional Elements. Mechanics 2019, 25, 463 -472.
AMA StyleAmer Sodah, Arvydas Palevicius, Giedrius Janusas, Paulius Palevicius, Yatinkumar Patel. Numerical and Experimental Investigation of Sonotrode for Formation of Piezocomposite Functional Elements. Mechanics. 2019; 25 (6):463-472.
Chicago/Turabian StyleAmer Sodah; Arvydas Palevicius; Giedrius Janusas; Paulius Palevicius; Yatinkumar Patel. 2019. "Numerical and Experimental Investigation of Sonotrode for Formation of Piezocomposite Functional Elements." Mechanics 25, no. 6: 463-472.
The concept of active microchannel for precise manipulation of particles in biomedicine is reported in this paper. A novel vibration-assisted thermal imprint method is proposed for effective formation of a microchannel network in the nanocomposite piezo polymer layer. In this method, bulk acoustic waves of different wavelengths excited in an imprinted microstructure enable it to function in trapping–patterning, valve, or free particle passing modes. Acoustic waves are excited using a special pattern of electrodes formed on its top surface and a single electric ground electrode formed on the bottom surface. To develop the microchannel, we first started with lead zirconate titanate (PZT) nanopowder [Pb (Zrx, Ti1–x) O3] synthesis. The PZT was further mixed with three different binding materials—polyvinyl butyral (PVB), poly(methyl methacrylate) (PMMA), and polystyrene (PS)—in benzyl alcohol to prepare a screen-printing paste. Then, using conventional screen printing techniques, three types of PZT coatings on copper foil substrates were obtained. To improve the voltage characteristics, the coatings were polarized. Their structural and chemical composition was analyzed using scanning electron microscope (SEM), while the mechanical and electrical characteristics were determined using the COMSOL Multiphysics model with experimentally obtained parameters of periodic response of the layered copper foil structure. The hydrophobic properties of the PZT composite were analyzed by measuring the contact angle between the distilled water drop and the three different polymer composites: PZT with PVB, PZT with PMMA, and PZT with PS. Finally, the behavior of the microchannel formed in the nanocomposite piezo polymer was simulated by applying electrical excitation signal on the pattern of electrodes and then analyzed experimentally using holographic interferometry. Wave-shaped vibration forms of the microchannel were obtained, thereby enabling particle manipulation.
Giedrius Janusas; Kestutis Pilkauskas; Arvydas Palevicius. Active PZT Composite Microfluidic Channel for Bioparticle Manipulation. Sensors 2019, 19, 2020 .
AMA StyleGiedrius Janusas, Kestutis Pilkauskas, Arvydas Palevicius. Active PZT Composite Microfluidic Channel for Bioparticle Manipulation. Sensors. 2019; 19 (9):2020.
Chicago/Turabian StyleGiedrius Janusas; Kestutis Pilkauskas; Arvydas Palevicius. 2019. "Active PZT Composite Microfluidic Channel for Bioparticle Manipulation." Sensors 19, no. 9: 2020.
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 micro-hydro-mechanical devices for biomedical/biochemical purposes. Controllable properties were obtained by incorporating different types of binders in a piezoelectric ceramic matrix (lead zirconate titanate): polyvinyl butyral (PVB), poly methyl methacrylate (PMMA), and polystyrene (PS). The change in chemical composition of PZT helps to manipulate the piezoelectric characteristics, surface morphology, mechanical properties, etc., of the designed microfluidic element with the microstructure in it.
Elingas Cekas; Giedrius Janusas; Asta Guobiene; Arvydas Palevicius; Andrius Vilkauskas; Sigita Ponelyte Urbaite. Design of Controllable Novel Piezoelectric Components for Microfluidic Applications. Sensors 2018, 18, 4049 .
AMA StyleElingas Cekas, Giedrius Janusas, Asta Guobiene, Arvydas Palevicius, Andrius Vilkauskas, Sigita Ponelyte Urbaite. Design of Controllable Novel Piezoelectric Components for Microfluidic Applications. Sensors. 2018; 18 (11):4049.
Chicago/Turabian StyleElingas Cekas; Giedrius Janusas; Asta Guobiene; Arvydas Palevicius; Andrius Vilkauskas; Sigita Ponelyte Urbaite. 2018. "Design of Controllable Novel Piezoelectric Components for Microfluidic Applications." Sensors 18, no. 11: 4049.
‘Lab-on-a-chip’ is integrated micro-analytical system, which could perform sample pre-treatment, chemical reactions, analytical separation, detection and data handling. These platforms are able to convert biological, chemical or mechanical responses into electrical signals using the piezoelectric or piezoresistive materials. This paper discusses a piezoelectric composite material displaying its mechanical properties such as resonant frequencies, Young’s modulus and density. Nano composite polymer highlights the property of piezo effect and is suitable for formation of periodic micro scale patterns on it. These micro patterns are intended to be used as innovative functional elements in biomedical micro hydro mechanical systems such as micro channels. Thus by controlling surface configuration and the shape of active deformable polymer, pressure in microfluidic vessels can be changed and mobility of the transported bioparticles can be ensured.
Arvydas Palevicius; Giedrius Janusas; Elingas Cekas; YatinkumarRajeshbhai Patel. Composite Piezoelectric Material for Biomedical Micro Hydraulic System. Computer Vision 2018, 49 -58.
AMA StyleArvydas Palevicius, Giedrius Janusas, Elingas Cekas, YatinkumarRajeshbhai Patel. Composite Piezoelectric Material for Biomedical Micro Hydraulic System. Computer Vision. 2018; ():49-58.
Chicago/Turabian StyleArvydas Palevicius; Giedrius Janusas; Elingas Cekas; YatinkumarRajeshbhai Patel. 2018. "Composite Piezoelectric Material for Biomedical Micro Hydraulic System." Computer Vision , no. : 49-58.
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-active functional element to drive micro cantilever in order to detect concentration of glucose in the physiological liquid. Analytical, numerical and experimental methods for design and analysis of viscoelastic sensor are presented. DOI: http://dx.doi.org/10.5755/j01.mech.24.1.19230
Giedrius Janušas; Alfredas Brunius; Christopher Rayappan; Arvydas Palevicius; Kęstutis Pilkauskas; Tomas Janušas. Design and Analysis of Viscometric Sensor with Embedded Microstruc-ture for Biomedical Applications. Mechanics 2018, 24, 115 - 120 .
AMA StyleGiedrius Janušas, Alfredas Brunius, Christopher Rayappan, Arvydas Palevicius, Kęstutis Pilkauskas, Tomas Janušas. Design and Analysis of Viscometric Sensor with Embedded Microstruc-ture for Biomedical Applications. Mechanics. 2018; 24 (1):115 - 120.
Chicago/Turabian StyleGiedrius Janušas; Alfredas Brunius; Christopher Rayappan; Arvydas Palevicius; Kęstutis Pilkauskas; Tomas Janušas. 2018. "Design and Analysis of Viscometric Sensor with Embedded Microstruc-ture for Biomedical Applications." Mechanics 24, no. 1: 115 - 120.
Giedrius Janusas; Asta Guobiene; Arvydas Palevicius; Lukas Ramalis; Giedrius; Asta; Arvydas; Lukas. Nanoporous aluminum oxide membranes for biomedical micro hydraulic devices. Vibroengineering PROCEDIA 2017, 15, 110 -114.
AMA StyleGiedrius Janusas, Asta Guobiene, Arvydas Palevicius, Lukas Ramalis, Giedrius, Asta, Arvydas, Lukas. Nanoporous aluminum oxide membranes for biomedical micro hydraulic devices. Vibroengineering PROCEDIA. 2017; 15 ():110-114.
Chicago/Turabian StyleGiedrius Janusas; Asta Guobiene; Arvydas Palevicius; Lukas Ramalis; Giedrius; Asta; Arvydas; Lukas. 2017. "Nanoporous aluminum oxide membranes for biomedical micro hydraulic devices." Vibroengineering PROCEDIA 15, no. : 110-114.
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 lead to the variation of the properties of the device itself. This research paper covers the fabrication of a novel PZT film and the investigations of its chemical, surface, and dynamic properties when film thickness is varied. A screen-printing technique was used for the formation of smooth films of 60 µm, 68 µm, and 25 µm thickness. A custom-made poling technique was applied to enhance the piezoelectric properties of the designed films. However, poling did not change any compositional or surface characteristics of the films; changes were only seen in the electrical ones. The results showed that a thinner poled PZT film having a chemical composition with the highest amount of copper and zirconium led to better electrical characteristics (generated voltage of 3.5 mV).
Giedrius Janusas; Sigita Ponelyte; Alfredas Brunius; Asta Guobiene; Andrius Vilkauskas; Arvydas Palevicius. Influence of PZT Coating Thickness and Electrical Pole Alignment on Microresonator Properties. Sensors 2016, 16, 1893 .
AMA StyleGiedrius Janusas, Sigita Ponelyte, Alfredas Brunius, Asta Guobiene, Andrius Vilkauskas, Arvydas Palevicius. Influence of PZT Coating Thickness and Electrical Pole Alignment on Microresonator Properties. Sensors. 2016; 16 (11):1893.
Chicago/Turabian StyleGiedrius Janusas; Sigita Ponelyte; Alfredas Brunius; Asta Guobiene; Andrius Vilkauskas; Arvydas Palevicius. 2016. "Influence of PZT Coating Thickness and Electrical Pole Alignment on Microresonator Properties." Sensors 16, no. 11: 1893.
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 platform where this material was integrated. Results showed that a designed novel cantilever-type element is able to generate a voltage of up to 80 µV at 50 Hz frequency. To use this element for sensing purposes, a four micron periodical microstructure was imprinted. Silver nanoparticles were precipitated on the grating to increase the sensitivity of the designed element, i.e., Surface Plasmon Resonance (SPR) effect appears in the element. To tackle some issues (a lack of sensitivity, signal delays) the element must have certain electronic and optical properties. One possible solution, proposed in this paper, is a combination of piezoelectricity and SPR in a single element.
Giedrius Janusas; Sigita Ponelyte; Alfredas Brunius; Asta Guobiene; Igoris Prosycevas; Andrius Vilkauskas; Arvydas Palevicius. Periodical Microstructures Based on Novel Piezoelectric Material for Biomedical Applications. Sensors 2015, 15, 31699 -31708.
AMA StyleGiedrius Janusas, Sigita Ponelyte, Alfredas Brunius, Asta Guobiene, Igoris Prosycevas, Andrius Vilkauskas, Arvydas Palevicius. Periodical Microstructures Based on Novel Piezoelectric Material for Biomedical Applications. Sensors. 2015; 15 (12):31699-31708.
Chicago/Turabian StyleGiedrius Janusas; Sigita Ponelyte; Alfredas Brunius; Asta Guobiene; Igoris Prosycevas; Andrius Vilkauskas; Arvydas Palevicius. 2015. "Periodical Microstructures Based on Novel Piezoelectric Material for Biomedical Applications." Sensors 15, no. 12: 31699-31708.
The quality of microstructure, created on polycarbonate (PC), by using hot imprint process and changing vibration parameters is investigated in this paper, in order to reveal the best option and further successfully apply this process in research and industry. Earlier it was revealed, that high frequency excitation, with usage of vibroactive pad, made from aluminum and piezoceramic (PZT-4) positively affects the quality of microstructure. Now, when working regimes are known it is necessary to find out which of them influences the quality of created microstructure best. Thus the experiment, when holding all parameters of the process constant, and only changing vibration modes, which are already known, is carried out. After the experiment qualitative analysis, using optical microscope is performed.
A. Palevičius; R. Šakalys; G. Janušas; P. Narmontas. Investigation of Dependency of Microstructure Quality on Vibration Mode. Green Defense Technology 2014, 49 -54.
AMA StyleA. Palevičius, R. Šakalys, G. Janušas, P. Narmontas. Investigation of Dependency of Microstructure Quality on Vibration Mode. Green Defense Technology. 2014; ():49-54.
Chicago/Turabian StyleA. Palevičius; R. Šakalys; G. Janušas; P. Narmontas. 2014. "Investigation of Dependency of Microstructure Quality on Vibration Mode." Green Defense Technology , no. : 49-54.