Viscoelastic Response of Magnetorheological Suspensions

Smart materials are usually referred to the systems that can alter some of their properties when exposed to an external stimulus. Magnetorheological fluids (MRFs) and elastomers (MREs) are categorized as good examples of smart materials as they are able to change properties such as their mechanical properties and conductivity under the influence of a magnetic field. This topic has grown significantly both in the fundamental research and applications however, there is a big gap in between as in fundamental research only one type of flow is studied while in real applications, more types of flow are present. This thesis tries to marry the fundamental research of MRFs and MREs with their applications. Different types of MRFs were developed based on specific applications. To be specific this thesis includes the development of conductive and magnetic composites based on polypyrrole (PPy), magnetite nanoparticles, nickel and iron microparticles (carbonyl iron) which were used as an MRF. The particles are used as electrical devices that are able to control the resistance and capacitance under the influence of an external magnetic field. Additionally, due to the ability of the PPy to be synthesised in different morphology, dimorphic MRFs were investigated filling an important gap of the field. Due to the rise of MRE-based materials, it is important to prepare recyclable MREs. Thermoplastic-based MREs were prepared based on several types of matrices including a thermoplastic polyurethane and a propylene-based elastomer supplemented with ethylene groups. Both types of MREs are able to be reprocessed several times. The mechanical properties after processing were similar to the initial batches. The reprocessing was simulated by studying the time dependency of the MREs and it was found that the matrix can interact and bond with the magnetic particles.

ISBN:	978-80-7678-314-0
EAN:	9788076783140
Počet stran	51 stran
Datum vydání	09. 01. 2025
Pořadí vydání	První
Jazyk	anglický
Vazba	e-kniha - pdf
Autor:	Andrei Munteanu
Nakladatelství	Univerzita Tomáše Bati ve Zlíně
Tématická skupina	999 - nezařazeno
	Neprodejná publikace. Publikaci je možné poptávat zde: Volně dostupné na http://hdl.handle.net/10563/56810