Primjena nanomaterijala u glinenim kompozitima za zaštitu od prodora mikrovalnog zračenja

doctoral thesis

• Title (english): Application of nanomaterials in clay composites for protection against microwave radiation penetration
• Author: Jelena Brdarić Kosanović
• Mentor: Berislav Marković (mentor)
• Mentor: Ivana Miličević (komentor)
• Committee member: Vladimir Stilinović (predsjednik povjerenstva)
• Committee member: Vanja Mandrić (član povjerenstva)
• Committee member: Maja Dutour Sikirić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Chemistry); Zagreb
• Defense date and country: 2023-12-20, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Chemistry
• Universal decimal classification (UDC): 54 - Chemistry. Crystallography. Mineralogy

Abstract

U ovom radu su ispitani glineni kompozitni materijali s obzirom na prodor mikrovalnog začenja u
frekvencijskom području između 1,5 i 6,0 GHz, a koje se koristi za mobilnu telefoniju (2G – 5G).
Nanomaterijali (lebdeći pepeo, titanijev dioksid različitih veličina čestica i faza, cinkov ferit,
željezov(III) oksid, antimonov(III) kositrov(IV) oksid i višestjenčane ugljične nanocjevčice) koji su
dodani u glinu, kao osnovni materijal, detaljno su okarakterizirani različitim fizikalnim i kemijskim
metodama (specifična površina, termička svojstva, fazni sastav, morfologija, kemijski i mineraloški
sastav). Ispitivanja prodora mikrovalnog zračenja spektralnim analizatorom provedena su na pečenim
diskovima promjera 15 cm koji su izrađeni kao dvokomponentni glineni kompoziti s udjelom
navedenih nanomaterijala od 1, 2, 3, 5 i 10 %. Prema dobivenim rezultatima pripremljene su
trokomponentne smjese (titanijev dioksid s lebdećim pepelom i s antimonovim(III) kositrovim(IV)
oksidom) te su i one ispitane. Određena je toplinska vodljivost svih dvokomponentnih i
trokomponentnih kompozita. Kako bi bila ispitana upotrebljivost u građevinarstvu, izrađene su pune
opeke od trokomponentnih smjesa te im je određena vodoupojnost i tlačna čvrstoća. Rezultati mjerenja
pokazuju kako dodatak istraživanih nanomaterijala u glinu značajno smanjuje prodor u području
mikrovalnog zračenja, a istovremeno poboljšava ispitana fizikalno–mehanička svojstva.

Abstract (english)

n this thesis, clay composite materials were examined with regard to the penetration of microwave
radiation in the frequency range between 1.5 and 6.0 GHz, which is used for mobile telephony (2G -
5G). Nanomaterials (fly ash, titanium dioxide of different particle sizes and phases, zinc ferrite,
iron(III) oxide, antimony(III) tin(IV) oxide and multi-walled carbon nanotubes) added to clay, as the
basic material, were characterized by physical and chemical methods (specific surface area, thermal
properties, phase composition, morphology, chemical and mineralogical composition). Tests of the
penetration of microwave radiation with a spectral analyzer were carried out on fired discs with a
diameter of 15 cm, which were made as two-component clay composites having 1, 2, 3, 5 and 10 % of
the mentioned nanomaterials. According to the obtained results, three-component mixtures (clay,
titanium dioxide with fly ash and antimony tin oxide) were prepared and tested. The thermal
conductivity of all two-component and three-component composites was determined. In order to test
the applicability in construction, solid bricks were made from the three-component mixtures and their
water absorption and compressive strength were determined. The results show that the addition of
investigated nanomaterials to clay significantly reduces penetration in the area of microwave radiation,
and at the same time improves the tested physical-mechanical properties.

• Keywords: prodor mikrovalnog zračenja; mobilna telefonija; nanomaterijali; spektralna analiza; građevinski materijali
• Keywords (english): microwave radiation penetration; mobile telephony; nanomaterials; spectral analysis; civil engineering materials
• Language: croatian
• URN:NBN: urn:nbn:hr:217:200877
• Promotion: 2024
• Study programme: Title: Doctoral study; Study programme type: university; Study level: postgraduate; Academic / professional title: doktor/doktorica u području prirodnih znanosti (doktor/doktorica u području prirodnih znanosti)
• Type of resource: Text
• Extent: 90, XXIX str. ; 30 cm
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-01-05 11:39:52