A5030155749- Natural Fiber Reinforced Composites
- Additive Manufacturing and 3D Printing Technologies
- Polymer Nanocomposites and Properties
- Polymer crystallization and properties
- Additive Manufacturing Materials and Processes
- Acoustic Wave Phenomena Research
- Recycling and Waste Management Techniques
- Innovations in Concrete and Construction Materials
- Wood Treatment and Properties
- Cellular and Composite Structures
- biodegradable polymer synthesis and properties
- Advanced Photocatalysis Techniques
- Injection Molding Process and Properties
- Pigment Synthesis and Properties
- Photovoltaic Systems and Sustainability
- High Entropy Alloys Studies
- TiO2 Photocatalysis and Solar Cells
- Material Properties and Processing
- Graphite, nuclear technology, radiation studies
- Innovative concrete reinforcement materials
- Mechanics and Biomechanics Studies
- Recycled Aggregate Concrete Performance
- Nanocomposite Films for Food Packaging
- Aluminum Alloys Composites Properties
- Manufacturing Process and Optimization
Transylvania University of Brașov
2015-2024
Gheorghe Asachi Technical University of Iași
2013
ABSTRACT Three‐dimensional (3D) printing processes are nowadays leading the charge in transforming traditional art, engineering, and manufacturing processes. In this study, structural thermal behavior of commercially available filaments composed synthetic poly(acrylonitrile‐ co ‐butadiene‐ ‐styrene) thermoplastic as well poly(lactic acid) acid)/polyhydroxyalcanoate reinforced with bamboo ( Bambusa sp .) wood flour composite biothermoplastics were assessed by differential scanning calorimetry...
This paper discusses the structure morphology and thermal swelling behavior of physically crosslinked hydrogels, obtained from applying four successive freezing-thawing cycles to poly (vinyl alcohol) blended with various amounts κ-carrageenan. The addition carrageenan in a weight ratio 0.5 determines twofold increase degree early diffusion coefficients hydrogels when immersed distilled water, due decrease crystallinity polymer matrix. water into matrix could be considered as...
The paper studies the UV exposure influence on mechanical properties, crystalline, interface and morphology of optimised (previously water immersed) composites with wastes rubber, PET, HDPE, wood inorganic filler (CaO fly ash). strength, photo-degradation, crystalline structure surface morphologies changes are evaluated after their under simulated light compared to unexposed ones. Experimental results showed lead increase Young moduli, compressive strength tensile for high content PET...
The 3D printing process allows complex structures to be obtained with low environmental impact using biodegradable materials. This work aims develop and acoustically characterize 3D-printed panels three types of materials, each manufactured at five infill densities (20%, 40%, 60%, 80% 100%) internal configurations based on circular, triangular, corrugated profiles. highest absorption coefficient values (α = 0.93) were from the acoustic tests for polylactic acid material ground birch wood...
The functionalization of polyethylene terephthalate (PET) from tire rubber–PET–high density (HDPE) composites represents a key strategy for improving the composite properties. This is practical and effective method to improve interface between matrix (waste rubber) fillers PET HDPE). By functionalization, adherence surface properties materials can be controlled. was performed with glycol (PEG 400, 1%) sodium dodecyl sulphate (SDS 1%). characterization components are discussed in terms energy...
The paper presents new value-added composite materials prepared by recycling tire rubber, polyethene terephthalate (PET), high-density (HDPE), wood sawdust, and fly ash. composites were manufactured through the compression molding technique for three temperatures (150 °C, 160 190 °C) previously optimized. addition of ash as reinforcement in polymer blends is a viable route to improve composite” properties. aims assess effect on mechanical properties water stability all waste considering...
The acoustic features of old resonance wood in violins exhibit a superior quality when compared to those from new wood. This study focuses on an assessment the sound two types for musical instruments, spruce and maple (class A D), before after aging via thermal UV exposure. samples were characterized terms color change (using Chroma meter), surface morphology MarSurf XT20 instrument), chemical changes (monitored by FTIR spectroscopy), propagation speed ultrasound device). After treatment,...
Abstract The study investigates the effect of type varnish and number layers on some acoustic properties resonance spruce in combination with changes produced physical, morphological, chemical wood. In addition to color surface chemistry, roughness morphology are modified by thickness film, 10 being optimal from this point view, as well oil‐based finish. sound absorption coefficient increases varies frequency range, type, wood quality, all contributing tunability. For example, for a 1.5 kHz,...
Sound-absorbing panels are widely used in the acoustic design of aircraft parts, buildings and vehicles as well sound insulation absorption areas with heavy traffic. This paper studied properties sound-absorbing manufactured three nozzle diameters (0.4 mm, 0.6 mm 0.8 mm) by 3D printing from types polylactic acid filaments (Grey Tough PLA; Black PLA Pro; Natural PLA) six internal configurations labyrinthine zigzag channels (Z1 Z2). The coefficient sample Z2 pattern, a 5.33 height, diameter...
Sustainable building materials with excellent thermal stability and sound insulation are crucial for eco-friendly construction. This study investigates biocomposites made from cellulose pulp reinforced beeswax, fir resin, natural fillers like horsetail, rice flour, needles. Eight formulations were obtained, their resistance, oxidation temperature, acoustic properties evaluated. Biocomposites exhibited significant improvements compared to conventional materials. Oxidation temperature onset...
This study aimed to investigate the properties of composites based on polymeric waste with organic and inorganic fillers before after accelerated aging for indoor or outdoor applications. The were obtained by compression molding from waste: tire rubber as a matrix, polyethene terephthalate (PET), high-density polyethylene (HDPE) TiO2 nanoparticles fillers. critical issue in ensuring good mechanical is interface between components composites. effects moisture, temperature, UV radiation, salt...
In the acoustics of musical instruments with a resonator body, aging wood leads to improvement acoustic properties due increasing crystallinity wood. This phenomenon could be explained by fact that is complex product based on three-dimensional polymer chains carbohydrates, its being closely related covalent cross-linking and scission chains. The aim this study was evaluate at multiscale changes produced artificial tone measuring acoustic, mechanical chemical parameters. spruce maple samples...
Rubber-thermoplastic-based composites represent widely used materials due to their good mechanical properties that can be controlled according the composition and interfaces. Considering as output, recycled polyethylene terephthalate-rubber-based with optimized curing temperature were obtained, where rubber acts a matrix, terephthalate filler high-density compatibility agent. By adding another material wood (sawdust), novel composite tailored was obtained via compression molding. The...
The paper presents the microstructure and corrosion behavior of an AlTiNiCuAgSn new equiatomic multicomponent alloy. alloy was obtained using vacuum arc remelting (VAR) technique in MRF-ABJ900 equipment. microstructural analysis performed by optical scanning electron microscopy (SEM microscope, SEM-EDS) phase transformations were highlighted dilatometric differential thermal (DTA). results show that as-cast is three-phase, with average microhardness 487 HV0.1/15. could be included group...
The continuous development of modern industries rises the necessity for functionally graded materials. This research starts from consideration that incorporation SiC particles in molten aluminum alloy can be difficult due to very low wettability particles. In order increase their wettability, were covered with a layer metallic copper. into mass was performed by centrifugal casting. secondary hypoeutectic Al-Si used this study elaborated within crucible resistors heated furnace. coating...
The first part of this paper is dedicated to obtaining 3D-printed molds using poly lactic acid (PLA) incorporating specific patterns, which have the potential serve as foundation for sound-absorbing panels various industries and aviation. molding production process was utilized create all-natural environmentally friendly composites. These composites mainly comprise paper, beeswax, fir resin, including automotive function matrices binders. In addition, fillers, such needles, rice flour,...
The paper investigates new composites fully based on wastes of polyethylene terephthalate, rubber, high-density polyethylene, and wood, aiming at multifunctional, environmental-friendly materials, for indoor outdoor applications. rubber: terephthalate: polyethylene: wood ratio compression molding temperatures are optimized considering the output mechanical properties, focusing increasing waste terephthalate content. To investigate durability in working conditions, water-stable composites,...
New materials are obtained by transforming fly ash wastes into a valuable composite, with tandem adsorption and photodegradation properties. Mild hydrothermal synthesis, from titanium dioxide, platinum nanoparticles zeolite waste, ash, as support, was involved in the composite preparation. The extended photocatalytic activity of visible range (Eg = 2.1 eV). efficiency new were determined to be 25% for Bemacid Blau 43.89% Rot after 360 min, irradiation time. addition H2O2 improves process up...