20.500.12556/RUL-189308 Bakterijski biofilmi kot biolepila Bacterial biofilms as bioadhisives Trg biolepil zelo hitro raste in potrebe po novih biolepilih so velike. V magistrskem delu smo preizkušali lepilne sposobnosti izbranih bakterijskih biofilmov na lesu smreke. Analizirali smo reološke lastnosti in površinske energije biofilmov. Osredotočili smo se na biofilma bakterij E. coli 1655 in B. subtilis 3610. Po enem dnevu sušenja sta imela biofilma primerljive lepilne lastnosti, po štirih dneh pa se je biofilm bakterije E. coli izkazal za boljšega. Reološki testi so pokazali, da je biofilm bakterije B. subtilis bolj viskozen in bolj odporen na mehanske sile, biofilm bakterije E. coli pa ima za lepljenje primernejše razmerje med viskoznim in elastičnim modulom ter se ob nanosu bolje razporedi po površini. Pri merjenju površinskih energij se je za bolj primernega izkazal biofilm bakterije E. coli, kjer večja kompatibilnost z lesom omogoča boljše prodiranje v les in s tem večjo stično ploskev z lepilom. Rezultati nakazujejo, da imajo biofilmi sposobnost lepljenja lesa. The bio-adhesives market is growing rapidly, and there is a strong need for new bio-based adhesives. In this master’s thesis, we investigated the adhesive properties of bacterial biofilms on spruce wood. We tested bacterial biofilms of different species and further focused on those of E. coli 1655 and B. subtilis 3610. We determined the rheological properties and surface energies of these two biofilms. After one day of drying, both biofilms showed comparable adhesive properties; however, after four days, the E. coli biofilm performed better. Rheological tests showed that the B. subtilis biofilm is more viscous and more resistant to mechanical forces, whereas the E. coli biofilm has more favorable balance between viscous and elastic modulus for adhesion and spreads better over the surface upon application. Measurements of surface energies indicated that the E. coli biofilm is more suitable, as its greater compatibility with wood enables better penetration into the wood and thus a larger contact area with the adhesive. The results suggest that bacterial biofilms have potential as wood-adhesive materials. biofilm biolepilo Escherichia coli Bacillus subtilis reologija viskoelastičnost površinska energija polimeri biofilm bioadhesive Escherichia coli Bacillus subtilis rheology viscoelastic surface energy polymers true false false [K. Saje] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-10-03 07:15:35 2026-10-03 07:15:41 2026-10-07 03:52:23 0000-00-00 00:00:00 2026 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 579.6:579.26:544 298213 293716227 63651.pdf 63651.pdf 1 8EC691BF5C8A07BC5AE3AAFB71690D3F 9c01b061a4c454c476b463cb9d25b78ca059fb3229b65ffe1e28fa2f0118a541 5fbed71d-bee9-11f1-8bc5-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=249780 Biotehniška fakulteta 0 0 0