Industrial and Materials Science

"Enhanced Self-Pumping Magnetic Cooling with Fe3O4–hBN and Fe3O4–Graphene Ferrofluids"
Abstract: Efficient thermal management is essential in modern technologies, requiring advanced materials and passive cooling mechanisms. This study investigates the thermal performance of magnetic ferrofluids based on Fe3O4 and its nanocomposites with two dimensional (2D) hexagonal boron nitride (hBN) and graphene, developed for self-pumping magnetic cooling systems. The heat transport is governed by thermomagnetic convection, where temperature-dependent magnetization induces fluid motion under an applied magnetic field. Experimental results show that the incorporation of hBN and graphene significantly enhances heat dissipation compared to pristine Fe3O4 ferrofluid. Across heat loads from 3.2 to 9.1 W, the Fe3O4–hBN ferrofluid consistently exhibited the highest cooling performance, with temperature differences increasing from 6.4 °C at 3.2 W to 21.1 °C at 9.1 W, substantially higher than Fe3O4 alone. A strong linear correlation between heat load and temperature difference confirms stable thermomagnetic convection behavior. These findings demonstrate that the Fe3O4–hBN nanocomposite ferrofluid offers superior thermal transport, highlighting its potential for energy-efficient magnetic cooling and advanced thermal management applications.
Program: MPNAT Nanotechnology Examiner: Varun Chaudhary, IMS Supervisors: Nishant Tiwari &amp; Varun Chaudhary, IMS 
Opponent: Gokul Babu  
Date and time: 14 October 2025, 13.30-14.30 Location: <a rel="noopener" href="https://maps.chalmers.se/#eae7628e-06cb-4f2a-96da-2b919faaa5d0" target="_blank" data-anchor="#eae7628e-06cb-4f2a-96da-2b919faaa5d0">M Alpha</a>

"Development of Lightweight, Sustainable, Functional Battery Pack Materials for Electric Vehicles"
Abstract: The increased demand for battery electric vehicles (BEVs) necessitates innovative battery packaging materials that are lightweight, mechanically robust, and environmentally friendly, surpassing metal-dominant solutions. This thesis evaluates graphene-derivative (GO/rGO) polymer coatings as multifunctional layers for two packaging domains: carbon-fiber (CF) skins for enclosures and PA/PE films for pouch laminates. A focused literature benchmark is coupled with experiments on coated CF and PA/PE coupons at 1, 3, and 5 wt% graphene loadings. Performance was assessed by peel load–displacement (interfacial adhesion and failure mode), tensile testing (mechanical integrity of coated substrates), and a 48 h deionized-water soak (moisture stability).
Results show that low–to–moderate loadings (1–3 wt%) consistently produce robust adhesion and retain mechanical performance on both CF and PA/PE, with coatings remaining stable after soaking. In contrast, 5 wt% exhibited early debonding, particulate release, and degraded mechanical response, evidencing interfacial instability.
The results provide practical design guidance for metal-lean/metal-free battery packaging, recommending a limit to graphene loading within the 1–3 wt% window and deploying graded coatings—lower loading at adhesion-critical interfaces and moderate loading where added reinforcement or barrier tortuosity is required. This pathway supports lightweight CF enclosures and metal-free pouch laminates while aligning with sustainability objectives. Priority next steps include quantitative WVTR/OTR, electrolyte ageing, and thermal/abuse propagation studies, alongside life-cycle and scalability assessments. 
Program: MPMOB Mobility Engineering Examiner: Jinhua Sun, IMS Supervisor: Jinhua Sun, IMS
Opponent: Sharmith Patel Nagaraj&nbsp;
Date and time: 14 October 2025, 15.00-16.00 Location: <a rel="noopener" href="https://maps.chalmers.se/#0879aeaf-b53a-4f7a-98b5-ed90e372059d" target="_blank" title="Link to Campus Maps" data-anchor="#0879aeaf-b53a-4f7a-98b5-ed90e372059d">M Beta</a>

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Presentation of master thesis

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Presentation of master thesis

Master thesis presentations at Industrial and Materials Science

14 October 2025

13.30-14.30: Pathompron Jaikwang, MPNAT

15.00-16.00: Jayanth Soragaon, MPMOB