1. Thermal and mechanical properties of in-house-manufactured PLA and PA filaments at high temperatureNabilah Afiqah Mohd Radzuan, Izzat Mat Samudin, M. S. H. Al-Furjan, Abu Bakar Sulong, Farhana Mohd Foudzi, Muhammad Amin Azman, 2025, original scientific article Keywords: polymer composites, additive manufacturing, mechanical properties, finite element analysis
Published in DiRROS: 01.09.2025; Views: 314; Downloads: 149
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2. Dielectric properties of ▫$FeGaInS_4/PVA$▫ composites: influence of filler concentrationsMahammad Baghir Baghirov, Mustafa Muradov, Zeynab Addayeva, Namiq Niftiyev, Faik Mammadov, Goncha Eyvazova, Marjetka Conradi, 2025, original scientific article Keywords: FeInGaS4/PVA composites, dielectric properties, electrical conductivity, semiconductor filler
Published in DiRROS: 20.08.2025; Views: 306; Downloads: 152
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3. Influence of Matrix, Filler, and structural design on the dielectric and energy storage properties of cellulose compositesMohammed Arif Poothanari, Hanuma Reddy Tiyyagura, Yasir Beeran Potta Thara, 2025, review article Abstract: Cellulose is a renewable, biodegradable, cost-effective, and easy-to-process natural biopolymer. Because of its dielectric, piezoelectric, and mechanical performance, cellulose and its composites are often used as a matrix, filler, substrate, gel electrolyte, and dielectric layer for flexible energy storage devices. They offer easy fabrication strategies and excellent mechanical properties. In this mini-review, we summarized the principles of dielectric and energy storage features of cellulose composites and factors affecting their dielectric properties, mainly exploring the incorporation of various filler materials in the cellulose matrices and cellulose materials acting as different types of fillers. Moreover, the fabrication strategies, structural design, and matrix-filler interactions of cellulose composites enhance their dielectric properties as systematically reviewed. This review summarizes the current state-of-the-art progress of cellulose dielectric composites, challenges, and future outlook for green dielectric and energy storage devices. The review suggests that optimizing the filler type, cellulose fiber content, fabrication techniques, and structural design can significantly enhance the dielectric properties and energy storage capacity of cellulose composites.
Keywords: cellulose composites, dielectric properties, energy storage, natural biopolymers, filler–matrix interaction, flexible electronic devices, sustainable materials, piezoelectric properties, gel electrolyte, composite structural design
Published in DiRROS: 24.06.2025; Views: 298; Downloads: 106
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4. Enhanced glass-jute epoxy hybrid composites reinforced with eggshell nanoparticles for sustainable high-performance engineering applicationsA. Ganesh Kumar, S. K. Pazhanivel, M. Arul, S. Dinesh, 2025, original scientific article Keywords: hybrid composites, glass-jute fiber, eggshell nanoparticles, sustainable reinforcement, bio-inspired nanocomposites, waste valorization
Published in DiRROS: 23.06.2025; Views: 410; Downloads: 228
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6. Liquid-copper infiltration and characterization of additively manufactured W-lattice structuresAljaž Iveković, Gokula Krishna Muralidharan, Andrei Galatanu, Guichuan Li, Kim Vanmeensel, Jef Vleugels, 2025, original scientific article Abstract: Tungsten-copper (W-Cu) composites have a wide range of engineering applications, from arc-resistant electrodes and high-voltage electrical contacts to heat sinks for integrated circuits and plasma-facing components for fusion reactors. They combine high corrosion and erosion resistance, very good thermal and electrical conductivity, low thermal expansion, with good mechanical properties. However, the fabrication of such materials is limited in terms of shape complexity and the internal distribution of the individual phases. Furthermore, the dissimilar thermo-mechanical properties (melting temperature, thermal conductivity, coefficient of thermal expansion) of the constituent phases impose severe constraints on the fabrication and use of W-Cu composites. To overcome the challenges of component design and enable greater freedom in terms of composition, W-Cu composites were produced by a combination of additive manufacturing and liquid-melt infiltration (LMI). Porous W-lattice structures were manufactured by laser powder-bed fusion (LPBF) followed by infiltration with molten Cu. A series of composites was produced with Cu contents from 3 to 75 vol% and evaluated in terms of thermal, electrical, and mechanical properties. The LPBF-LMI W-Cu composites exhibited comparable thermo-mechanical properties to W-Cu materials manufactured using powder-metallurgical processing, but with an expanded composition range and shape complexity. Lower thermal expansion coefficients (4.5–5.8 × 10−6 K−1) and an improved thermal stability of the Young’s modulus, only a 27–33 GPa decline in the range 27–827 °C, were observed for all the compositions, which was ascribed to the W-phase connectivity in all the W-Cu composites, independent of the volume fraction of Cu.
Keywords: termomechanical properties, liquid-metal infiltration, laser powder-bed fusion, metal-matrix composites
Published in DiRROS: 07.02.2025; Views: 636; Downloads: 139
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7. Investigating the synergistic impact of freeze-thaw cycles and deicing salts on the properties of cementitious composites incorporating natural fibers and fly ashIldikó Merta, Vesna Zalar Serjun, Alenka Mauko Pranjić, Aljoša Šajna, Mateja Štefančič, Bojan Poletanovic, Farshad Ameri, Ana Mladenović, 2025, original scientific article Abstract: In cold climates, concrete structures confront durability challenges due to harsh conditions. This study evaluates the effects of incorporating natural fibers, such as hemp and flax fibers (at 1 vol%), and partially replacing cement with fly ash (at 25 and 50 wt%) on the properties of cementitious composites subjected to accelerated aging under freeze-thaw cycles and deicing salts. Findings reveal that natural fibers enhance the freeze-thaw resistance, reducing deterioration (scaling) to 5-8% after 56 cycles. When mortars were subjected to accelerated freeze-thaw cycles, the compressive strength of plain mortar significantly decreased (up to 57%). However, adding natural fibers to the matrix substantially reduced its compressive strength loss. In the case of flexural strength, plain mortars experienced 33% loss, while hemp, flax, and polypropylene fiber mortars showed only 13%, 23%, and 10% losses, respectively. Furthermore, mortars experience a notable enhancement in their energy absorption capacity when reinforced with natural fibers, particularly with hemp fibers (up to 348% higher than plain mortar). Under harsh conditions, hemp and flax-reinforced mortars, with 25wt% fly ash replacement, lose the compressive strength significantly however still demonstrate an alternative to synthetic fibers in terms of flexural strength. Even with 25wt% of fly ash, mortars with natural fiber reinforcement display significantly superior energy absorption capacities compared to plain mortars (up to 48%).
Keywords: cementitious composites, natural fibers, freeze-thaw cycles, mechanical properties, mass loss, fly ash
Published in DiRROS: 23.12.2024; Views: 944; Downloads: 395
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8. Recycled red mud as an useful geotechnical materialPrimož Pavšič, Marija Đurić, Mateja Košir, Alenka Mauko Pranjić, Ana Mladenovič, Primož Oprčkal, Sara Seršen, Vesna Zalar Serjun, 2024, published scientific conference contribution Abstract: Red mud (RM) is an extractive waste from Bayer process in alumina production. The most conventional methods of RM disposal are tailing dams, or dry storage,both of which raiseenvironmental concerns due to the high alkalinity of RMandthe presence and leaching of potentially hazardous elements (PTEs).Due to its fine-grained nature and poor mechanical properties, as well as leaching of potentially hazardous substances, RM cannot be used by itself. Properties of the RM can be improved, by mixing it with hydraulic or pozzolanic binders, such as calcareous ashes or steelmaking slag, to produce mechanically stable and durable composites for earthworks. On the other hand, RMcan also serve as an immobilization additive for remediation of contaminated soils.Two different approaches for useful utilization of RMare presented based on results of laboratory research and a real case study, opening of new possibilities for conserving natural resources and reducing environmental hazards of RM deposits.
Keywords: red mud, recycling, geotechnical composites, environment
Published in DiRROS: 30.10.2024; Views: 863; Downloads: 1130
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10. Degradation and Stabilization of Polymer MaterialsBranka Mušič, Andrijana Sever Škapin, 2023, other scientific articles Keywords: polymer-based materials, nano, micro, and macro composites, effects on (micro) organisms and toxicity, impact on the ecosystem, mechanisms and products of accelerated aging and degradation, physical, chemical, mechanical, thermal, and morphological, analysis, biodegradability, sustainability, life cycle, renewable and recycled resources and the circular economy
Published in DiRROS: 21.12.2023; Views: 1310; Downloads: 702
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