Zaščita nemodificiranega in termično modificiranega lesa z nanodelci TiO2

Križan, Jernej (author), Petrič, Marko (mentor), Humar, Miha (comentor)

Ohranjanje naravnega videza in osnovnih lastnosti lesa, izpostavljenega ultravijolični svetlobi, predstavlja poseben izziv. Za preprečevanje fotodegradacijskih uporabljamo različne tehnike zaščite od termične modifikacije do nanosa drugih materialov na površine lesa. Med sodobnimi materiali se je nano titanijev dioksid uveljavil kot dober zaviralec fotodegradacije. V raziskavi smo izvedli impregnacijo termično modificiranega in nemodificiranega lesa bukovine s titanijevim dioksidom. Uspešnost postopka impregnacije smo potrdili z analizo z elektronskim vrstičnim mikroskopom. Delci titanijevega dioksida se naložijo na celične stene in se med seboj povezujejo ter tvorijo konglomerate različnih velikosti. Impregnirane preskušance smo izpostavili UV obsevanju, tekoči vodi, zračni vlagi in glivam razkrojevalkam. Najbolj barvno stabilen se je izkazal termično modificiran les s titanijevim dioksidom, največje barvne spremembe smo zaznali pri impregniranem lesu, ki smo ga kasneje termično modificirali. Impregniranemu lesu se ob stiku s tekočo vodo močno poveča vlažnost. Titanijev dioksid v lesu zmanjša navlaževanje lesa v nasičenem zraku. Stični koti vode na pol radialnih površinah se ob prisotnosti titanijevega dioksida povečujejo. Impregniran les s titanijevim dioksidom delno oziroma slabo zavira razkroj lesa zaradi delovanja gliv razkrojevalk.

• Language: Slovenian
• Keywords: zaščita, modificiran les, titanijev dioksid, UV svetloba
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [J. Križan]
• Year: 2021
• PID: 20.500.12556/RUL-131382
• UDC: 630*84
• COBISS.SI-ID: 77809667
• Publication date in RUL: 26.09.2021

KRIŽAN, Jernej, 2021, Zaščita nemodificiranega in termično modificiranega lesa z nanodelci TiO2 [online]. Master’s thesis. Ljubljana : J. Križan. [Accessed 8 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=131382

Secondary language

• Language: English
• Title: Protection of non-modified and thermally modified wood with TiO2 nanoparticles

Abstract

Preserving the natural appearance and basic properties of wood exposed to ultraviolet light is a particular challenge. To prevent photodegradation effects, we use various protection techniques from thermal modification to the application of other materials on wood surfaces. Among modern materials, nano titanium dioxide has established itself as a good inhibitor of photodegradation. In the research, we performed impregnation of thermally modified and unmodified beech wood with titanium dioxide. The success of the impregnation process was confirmed by analysis with a scanning electron microscope. Titanium dioxide particles are deposited on cell walls and bond together to form conglomerates of different sizes. Impregnated test specimens were exposed to UV radiation, water, air humidity, and wood degradation fungi. Thermally modified wood with titanium dioxide proved to be the most colour-stable, with the greatest colour changes detected at impregnated wood, which was later thermally modified. Impregnated wood has a high increase in humidity when in contact with water. Titanium dioxide in wood reduces the humidification of wood in saturated air. The contact angles of water on semi-radial surfaces increase in the presence of titanium dioxide. Impregnated wood with titanium dioxide partially or poorly inhibits the decomposition of wood due to the action of decaying fungi.

• Keywords: protection, modified wood, titanium dioxide, UV light