Miks Bleija / Materials & process engineer

PublicationsJournal articlesProblem / SolutionFull list: RTU Research

2026

Fused granulate fabrication of electroactive PBAT/PLA/MWCNT shape memory nanocomposites for 4D printing

Materials Advances 7 (2026) 9659 / 10.1039/d6ma00144k

ProblemHighly filled conductive shape memory blends are too viscous for filament-based 3D printing.

SolutionPellet-based fused granulate fabrication prints PBAT/PLA with 5 to 15 wt% MWCNT, with strong interlayer adhesion and shape recovery triggered electrically by Joule heating.

2026

Tuning electromagnetic absorption for EMI shielding in PBSA composites with Fe₃O₄-decorated carbon nanotubes

Synthetic Metals 321 (2026) 118263 / 10.1016/j.synthmet.2026.118263

ProblemCarbon nanotube composites shield largely by reflection, which returns the radiation to the surroundings.

SolutionFe₃O₄ deposited in one step on SWCNT and MWCNT without prior functionalization, at 0.10 to 2.0 vol% in PBSA. Absorption is up to 78% of the total shielding effectiveness, while unmodified SWCNT at 2.0 vol% becomes reflection-dominated at 8.4 to 12.6 GHz.

2026

Thermoelectric and electromagnetic performance of engineered covalent functionality microfibrillated cellulose/single-wall carbon nanotube buckypapers

Advanced Composites and Hybrid Materials (2026) / 10.1007/s42114-026-01965-7

ProblemCellulose in SWCNT buckypapers replaces part of the conductive network and lowers the thermoelectric power factor.

SolutionMDI-functionalized cellulose keeps the power factor at 101 to 111 µW m^-1 K^-2 at 70 to 90 wt% SWCNT (106 for neat SWCNT) and the Seebeck coefficient at 46 to 52 µV K^-1. PEG-modified cellulose gives n-type films, and an eight-couple module gives 10 mV at about 30 K. Shielding reaches 30 dB at 8 to 37 GHz.

2025

Improvement of mechanical properties of Nb on Cu structure for RF cavity by laser radiation: formation of soft Cu buffer layer

Results in Surfaces and Interfaces 22 (2026) 100693 / 10.1016/j.rsurfi.2025.100693

ProblemNb thin films on Cu RF resonators can detach from the substrate under thermal shock.

SolutionNanosecond Nd:YAG laser pulses increase the grain size of Nb and Cu, which hardens the Nb and softens the Cu in line with the Hall-Petch relation, and form a soft Cu layer 0.7 µm thick at the interface that buffers thermal shock. No Nb detachment was observed after thermal shock. Pulses of 1 ms or longer soften the whole 1 mm Cu substrate.

2025

Analysis of long-term stability and microwave electromagnetic interference shielding effectiveness of epoxy MWCNT/Cu@C nanocomposites after hydrothermal ageing in saline water

Applied Composite Materials 32 (2025) 2051 / 10.1007/s10443-025-10371-z

ProblemShielding composites for marine and aircraft use must keep their performance in humid, saline conditions.

SolutionEpoxy with MWCNT and 5 vol% Cu@C after 1000 h in 0.1 wt% NaCl at 80 °C: water uptake of at most 1 wt%, conductivity increased about tenfold to 0.21 S/m, and Ka-band shielding unchanged at 4 to 9 dB, dominated by absorption.

2025

Dielectric, low-frequency noise and mechanical properties of hybrid carbon nanotubes/graphene nanoplatelets epoxy composites

Polymer Composites 46 (2025) 3153 / 10.1002/pc.29160

ProblemIn MWCNT/GNP hybrid epoxies it was unclear which filler controls the electromagnetic response and which controls the mechanical response.

SolutionPercolation at about 0.25 vol.% MWCNT, with electromagnetic properties nearly independent of GNP content. Shielding from 26 to 37 GHz, 1/f noise from resistance fluctuations, and a 40% increase in tensile modulus at 0.25/0.25 vol.%.

2024

Evaluation of thermal conductivity models and dielectric properties in metal oxide-filled poly(butylene succinate-co-adipate) composites

Scientific Reports 14 (2024) 13629 / 10.1038/s41598-024-64426-5

ProblemHeat dissipation in electronics needs polymers that conduct heat but not electricity, and metal oxide fillers in biodegradable matrices had little data.

SolutionTiO₂, NiFe₂O₄, Fe₂O₃ and Fe₃O₄ in PBSA at 4 to 50 vol.%. Light flash data at high loading fit the Bruggeman and Agari models, giving electrically insulating heat-dissipation composites.

2023

Poly(butylene succinate) hybrid multi-walled carbon nanotube/iron oxide nanocomposites: electromagnetic shielding and thermal properties

Polymers 15 (2023) 515 / 10.3390/polym15030515

ProblemAbsorption-dominated EMI shielding usually needs high carbon nanofiller loadings, which raise cost.

SolutionMWCNT capped at 0.6 vol.% with 8 to 12 vol.% Fe₃O₄ in PBS. Shielding effectiveness of 20 to 52 dB at 30 GHz, dominated by absorption, and terahertz transmittance reduced by up to six orders of magnitude.

2022

Comparison of carbon-nanoparticle-filled poly(butylene succinate-co-adipate) nanocomposites for electromagnetic applications

Nanomaterials 12 (2022) 3671 / 10.3390/nano12203671

ProblemAntistatic, electrostatic dissipative and EMI shielding plastics are made from fossil-based, non-degradable polymers.

SolutionFour carbon fillers in compostable PBSA at 1.1 to 30 vol.%. All exceed 10^-10 S/m volume conductivity, 30 vol.% MWCNT reaches 0.756 W/(m·K), and MWCNT, GNP and nanostructured carbon black above percolation suit microwave and THz shielding.

Fused granulate fabrication of electroactive PBAT/PLA/MWCNT shape memory nanocomposites for 4D printing

Tuning electromagnetic absorption for EMI shielding in PBSA composites with Fe₃O₄-decorated carbon nanotubes

Thermoelectric and electromagnetic performance of engineered covalent functionality microfibrillated cellulose/single-wall carbon nanotube buckypapers

Improvement of mechanical properties of Nb on Cu structure for RF cavity by laser radiation: formation of soft Cu buffer layer

Analysis of long-term stability and microwave electromagnetic interference shielding effectiveness of epoxy MWCNT/Cu@C nanocomposites after hydrothermal ageing in saline water

Dielectric, low-frequency noise and mechanical properties of hybrid carbon nanotubes/graphene nanoplatelets epoxy composites

Evaluation of thermal conductivity models and dielectric properties in metal oxide-filled poly(butylene succinate-co-adipate) composites

Poly(butylene succinate) hybrid multi-walled carbon nanotube/iron oxide nanocomposites: electromagnetic shielding and thermal properties

Comparison of carbon-nanoparticle-filled poly(butylene succinate-co-adipate) nanocomposites for electromagnetic applications

Miks Bleija

Positions

Contact

Fused granulate fabrication of electroactive PBAT/PLA/MWCNT shape memory nanocomposites for 4D printing

Tuning electromagnetic absorption for EMI shielding in PBSA composites with Fe3O4-decorated carbon nanotubes

Thermoelectric and electromagnetic performance of engineered covalent functionality microfibrillated cellulose/single-wall carbon nanotube buckypapers

Improvement of mechanical properties of Nb on Cu structure for RF cavity by laser radiation: formation of soft Cu buffer layer

Analysis of long-term stability and microwave electromagnetic interference shielding effectiveness of epoxy MWCNT/Cu@C nanocomposites after hydrothermal ageing in saline water

Dielectric, low-frequency noise and mechanical properties of hybrid carbon nanotubes/graphene nanoplatelets epoxy composites

Evaluation of thermal conductivity models and dielectric properties in metal oxide-filled poly(butylene succinate-co-adipate) composites

Poly(butylene succinate) hybrid multi-walled carbon nanotube/iron oxide nanocomposites: electromagnetic shielding and thermal properties

Comparison of carbon-nanoparticle-filled poly(butylene succinate-co-adipate) nanocomposites for electromagnetic applications

Miks Bleija

Positions

Contact

Tuning electromagnetic absorption for EMI shielding in PBSA composites with Fe₃O₄-decorated carbon nanotubes