DiMould

Division of Moulds and Computational Fluids

> Injection and microinjection moulding tool design and optmization
> Injection and microinjection moulding process numerical simulation
> Polymer testing and characterization
> Heat transfer fluids development and characterization

Detailed description

> Towards the understanding of nanofluids multi-physics – Nanofluids, produced by dispersing nanoparticles homogeneously in traditional heat transfer fluids, have potential application in many heat transfer areas because of their intriguing properties such as considerable increase in thermal conductivity, long-term stability, and prevention of clogging in micro-channels. Hence, extensive efforts are being sought to develop long-term stable nanofluids to improve its thermal properties and to further elucidate on the thermal transport mechanism in nanofluids both experimental and numerically.

> Challenges in microinjection moulding of thermoplastics – Microinjection moulding (?IM) has been proven to be one of the most efficient technologies for manufacturing of thermoplastic microparts. Research dedicated to numerical prediction of the complex fluid dynamics and heat transfer phenomena inherent to the ?IM process revealed significant discrepancies between the numerically predicted and experimentally recorded polymer behavior requiring further insight towards attaining process quality.

> Shape memory polymers reinforced with nanoparticles – The development of new materials for applications as various as for active control actuators (such as artificial muscles), have attracted special interest in scientific community. There are different materials that possess shape-memory characteristic, including shape memory alloys (SMA), piezoelectric materials (PZTs) and currently polymers with shape memory (SMP). The latter one has got an advantage when compared to SMA and PZTs, it possess a higher recovery rate, lower cost and ease of processing. However, the reaction time of the SMP are longer (orders of seconds) when compared with SMA and PZTs time of reaction, which can as small as milliseconds. Thus, it is of utmost importance the development of new SMP with improved mechanical properties and lower reaction time to enhance the performance of different devices, such as actuator. Polyurethanes detain higher shape-memory effect when compared with other polymers, and the addition of nanoparticles as reinforcement has shown an enormous potential for several applications under study.

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