ABSTRACT Additive manufacturing (AM), otherwise known as three‐dimensional (3D) printing, is driving major innovations in many areas, such engineering, manufacturing, art, education, and medicine. Although a considerable amount of progress has been made this field, additional research work required to overcome various remaining challenges. Recently, one the actively researched areas lies AM smart materials structures. Electroactive incorporated 3D printing have given birth 4D where printed...

This work aims to enhance the dielectric and piezoelectric properties of polydimethylsiloxane (PDMS) polymer filled with zinc oxide (ZnO) powders. Both ZnO nanoparticles microparticles are used prepare composites a comparison their responses is carried out. The experimental results reveal that higher particle concentration gives rise increased permittivity composites, especially when particles aligned in poling-direction-based dielectrophoretic process. Hence, chosen instead nano ones...

Healthcare systems have a significant environmental impact and, thus, indirectly affect public health. In order to improve current practices, better understanding of the actual generated by surgical procedures is necessary.An eco-audit methodology was carried out assess greenhouse gas emissions arising from conventional isolated cardiac surgery procedures. This inquiry took into account 3 workstations (the surgical, anaesthesia and cardiopulmonary bypass workstations). All wastes were...

The aim of this paper was to provide insight into the impact matrix and surfactants on rheology, morphology, dielectric piezoelectric properties screen-printed BaTiO3/PVDF composites. Two matrices were compared (PVDF–HFP PVDF–TrFE), lead-free BaTiO3 microparticles added in volume fractions 30% 60%. Here, we demonstrated that presence surfactants, helping prevent phase separation, crucial for achieving a decent screen-printing process. Fourier-transform infrared (FTIR) spectroscopy together...

To treat cardiovascular diseases (i.e., a major cause of mortality after cancers), endovascular-technique-based guidewire has been employed for intra-arterial navigation. date, most commercially available guidewires (e.g., Terumo, Abbott, Cordis, etc.) are non-steerable, which is poorly suited to the human arterial system with numerous bifurcations and angulations. reach target artery, surgeons frequently opt several tools (guidewires different size integrated into angulated catheters) that...

Electrocaloric properties of poly(vinylidene fluoride-trifluoroethylene-chlorofluoroethylene) [P(VDF-TrFE-CFE)] terpolymer were determined by two methods. A modified differential scanning calorimeter measures the entropy variation when applying an electric field under isothermal conditions. Alternative technique consists infrared imaging camera that gives direct information on temperature in pseudo-adiabatic condition. Both techniques give similar results with a heat capacity 1500 J/(kg K)....

Abstract The development of steerable guide wire or catheter designs has been strongly limited by the lack enabling actuator technologies. This paper presents properties an electrostrive technology for actuation. By carefully tailoring material and design, which can be integrated in devices, this should realistically make it possible to obtain a design with considerable latitude. Electromechanical characteristics are described their impact on is discussed.

This paper proposed a new approach to achieve full characteristic of highly non-linear current density–electric field (J-E) curve, which depends on various key factors in terms filler concentration, temperature, input voltage level, and structuration ZnO particles (i.e. aligned or randomly dispersed). The homogeneity particle distribution within the polymer matrix, together with chain-like structure composites elaborated volume fraction was verified via microscopic investigations. Numerical...

This work focuses on the development of piezoelectric sensors for fractional flow reserve (FFR) technique, a procedure based measurement blood pressure within vessel to evaluate severity coronary stenosis. Considering medical application, biocompatibility is mandatory requirement that justifies selection fillers and matrix. Two composites made lead‐free barium titanate nanoparticles (BaTiO 3 ) incorporated in polydimethylsiloxane (PDMS) elastomer are developed: first composite with particles...

This paper reports on a novel technique of bearing load monitoring based the use smart sensor coating. For easier process and integration, screen printing is carried out to achieve multilayered thin film deposited an outer or simple flat steel substrate. The formulation piezoelectric ink relied development UV curable barium titanate/polyurethane acrylate (BaTiO3/PUA) composite. A new design proposed enhance sensitivity coating, which consists three stacked layers: piezocomposite layer,...

An artificial graft inserted in the vascular system can cause thrombosis, which may lead to catastrophic consequences. New intelligent prosthetics that recognize presence of clots are urgently needed. For this purpose, a novel biocompatible piezocomposite is designed for self-monitoring smart grafts. The new insight work involves fabrication composite with low filler content (5 %v) and high piezoelectric sensitivity (g33 ∼ 130 mV m N−1) suitable biosensors. produced by structuring fibers...

Abstract Electrostrictive polymers, as an important category of electroactive are known to have non-linear response in terms actuation that strongly affects their dynamic performance and limits applications. Very few models exist the literature, even fewer capable making reliable predictions under electric field. In this paper, electrostrictive strain dipolar polymeric systems is discussed through constitutive equations derived from Boltzmann statistics Debye/Langevin formalism. Macroscopic...

The purpose of this work aims at enhancing the electrostrictive strain response and mechanical energy density under moderate electric field, which is essential for actuator applications. For achieving this, plasticized effects as well influence chlorofluoroethylene chlorotrifluoroethylene defects on electromechanical behavior copolymer matrix poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) are investigated. Experimental results showed that terpolymer-based CFE presented better...

The elastocaloric properties of poly (vinylidene fluoride-trifluoroethylene-chlorotrifluoroethylene) [P(VDF-TrFE-CTFE)] terpolymer were directly characterized using an infrared imaging camera. At a strain 12%, reversible adiabatic temperature variation 2.15 °C was measured, corresponding to isothermal entropy 21.5 kJ m−3 K−1 or 11 J kg−1 K−1. In comparison with other materials, P(VDF-TrFE-CTFE) appears represent trade-off between the large required stresses in shape memory alloys and strains...

This study focusses on a low-frequency induction heating (LFIH) effect in thermoplastic polymer (acrylonitrile butadiene styrene, ABS) filled with iron oxide magnetic particles. The LFIH such ferromagnetic composites appears as soon the sample is exposed to an alternating excitation field and mainly due so-called "microscopic" eddy currents linked motions of domain wall. To generate AC significant amplitude under range few thousand Hz, specific test bench has been designed using rotating...

The overall performance of an electrostrictive polymer is rated by characteristic numbers, such as its transverse strain, blocking force, and energy density, which are clearly limited several parameters. Besides the geometrical impact, intrinsic material parameters, permittivity coefficient well Young's modulus breakdown electric field, have strong influences on actuation properties electroactive thus device's behavior. As a result, analysis figures merit (FOMs) involving all relevant...

Piezoelectric soft material based on inorganic/organic composites suitable for aerospace and aeronautical monitoring sensors is fabricated. The designed a piezoelectric composite made of lead zirconate titanate (PZT) filler embedded in poly(dimethyl siloxane) (PDMS) matrix. To improve the properties film, connectivity ceramic increased via electric field‐assisted structuration, which leads to columnar arrangement across thickness. This structure (1–3) shows higher piezoelectricity than one...

This paper reports a novel monitoring technique of bearings’ bidirectional load (axial and radial) based on smart sensor coating, which is screen printed onto the surface cross-shaped steel substrate. To ensure accuracy stability measurement as well durability developed prototype built according to design rules commonly used in electronic circuits. The finite element model (FEM) predict mechanical property tested substrate under either unidirectional or loads. Regarding output voltage...