diplomsko delo
Povzetek
Cilj diplomskega dela je bil priprava hidrogelov iz celuloznih nanofibril z navadno alkalno obdelavo in študij vpliva koncentracije bazične raztopine NaOH na njihovo tvorbo. Z različnimi koncentracijami alkalne raztopine smo želeli določiti optimalno razmerje med suspenzijo NFC, NaOH in vodo za tvorbo obstojnega hidrogela. K hidrogelom smo dodali kostanjev tanin, z namenom tvorbe hidrogela, ki bi imel antibakterijsko delovanje, saj je znano, da tanini dobro zavirajo rast bakterij. Iz tako pripravljenih, kompaktnih in stabilnih kompozitnih hidrogelov smo izmerili in izračunali maso, volumen, gostoto, vsebnost vode, poroznost in vsebnost suhe snovi hidrogela. Najboljše lastnosti in obstojnost so imeli hidrogeli, kjer je bila k 20 g NFC (1,3 %) dodana bazična raztopina v masnem razmerju 20/60 in 30/50 NaOH in destilirane vode. Antibakterijsko delovanje tanina je bilo moč opaziti že pri 1 % dodanega tanina glede na skupno maso hidrogela. S povečevanjem koncentracije tanina nad 3 % glede na maso NFC suspenzije smo negativno vplivali na kompaktnost hidrogelov. Tako smo ugotovili, da dodajanje tanina v koncentracijah, večjih kot 3 %, ni smiselno, saj ogrozimo kompaktnost hidrogela, antibakterijske lastnosti ostanejo enake, poleg tega pa se veliko tanina iz hidrogela izpere.
Ključne besede
hidrogel;nanofibrilirana celuloza;tanin;antibakterijsko delovanje;
Podatki
Jezik: |
Slovenski jezik |
Leto izida: |
2019 |
Tipologija: |
2.11 - Diplomsko delo |
Organizacija: |
UL BF - Biotehniška fakulteta |
Založnik: |
[L. Stante] |
UDK: |
630*813.2 |
COBISS: |
3127177
|
Št. ogledov: |
654 |
Št. prenosov: |
175 |
Ocena: |
0 (0 glasov) |
Metapodatki: |
|
Ostali podatki
Sekundarni jezik: |
Angleški jezik |
Sekundarni naslov: |
Use of nanofibrillated cellulose for the manufacture of hydrogels |
Sekundarni povzetek: |
It is known from previous research that the suspension of nanofibrillated cellulose is easily transformed into stable hydrogel with the process of mercerization. The goal of this work was the preparation of hydrogels from cellulose nanofibrils with basic alkaline processing, and a study of the effect that the concentration of the NaOH has on their formation. With differing concentrations of the alkaline solution the optimal correlation between the suspension of NFC, NaOH and H2O for the formation of a durable hydrogel was determined. To attain a hydrogel with antibiotic properties the chestnut tannin was added, as it is known that these tannins inhibit the growth of bacteria efficiently. From the stable and compact composite hydrogels thus produced we measured and calculated the mass, volume, density, water content, porosity and the content of the dry matter of the hydrogel. The hydrogels with optimal properties and durability were those with the mass ratio of NaOH and distilled water 20/60, 30/50. The antibacterial activity of tannin was visible as soon as 1% of tannin was added to a joint mass of hydrogel (100g). With increasing the concentration of tannin above 3% in reference to the mass of the NFC suspension, we negatively affected the compactness of hydrogels. Therefore, we concluded that adding tannins in a concentration above 3% is irrational, since it reduces the compactness of hydrogels, the antibacterial properties remain unchanged and the excess of tannin is flushed away. |
Sekundarne ključne besede: |
hydrogel;nanofibrillated cellulose;tannin;antibacterial activity; |
Vrsta dela (COBISS): |
Diplomsko delo/naloga |
Študijski program: |
0 |
Konec prepovedi (OpenAIRE): |
1970-01-01 |
Komentar na gradivo: |
Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo |
Strani: |
XI, 28 f., [3] f. pril. |
ID: |
11277826 |