Kiroptični materiali na osnovi celuloznih nanokristalov

diplomsko delo

Luna Kristančič (Author), Tilen Kopač (Mentor)

Abstract

Kiralnost je značilnost asimetričnih struktur, ki omogoča razlago dveh nepovezljivih zrcalnih oblik neke strukture. Kiralni mediji imajo različne hitrosti faznega širjenja valov levo- in desno-sučne krožne polarizacije, kar povzroči nesimetrično intenzivnost ali absorpcijo polarizirane svetlobe, ki se obnaša kot kiroptična aktivnost. V diplomski nalogi sem preučila razvoj kiroptičnih materialov na osnovi celuloznih nanokristalov. Osredotočila sem se na razvoj novih metod za sintezo celuloznih nanokristalov. To vključuje raziskovanje tehnik za natančno nadzorovanje njihove kiralnosti med proizvodnjo. Pri različnih ekstrakcijskih metodah pride tudi do precejšnje razlike v učinkovitost. Nekatere metode, s katerimi je možno nadzorovati določene parametre v strukturi, so funkcionalizacija površine, merjenje kiralne nematske faze in dodajanje kiralnih aditivov med sintezo. Nadzor pH, temperature in časa reakcije pa je ključen za doseganje optimalnih pogojev pri oblikovanju kiralnih struktur. Pri novih metodah je potrebno doseči visoko stopnjo nadzora za zagotovitev ponovljivosti in natančnosti izdelave celuloznih nanokristalov.

Keywords

celulozni nanokristali;kiroptični materiali;samosestavljanje;kiralnost;diplomska dela;

Data

Language:	Slovenian
Year of publishing:	2025
Typology:	2.11 - Undergraduate Thesis
Organization:	UL FKKT - Faculty of Chemistry and Chemical Technology
Publisher:	[L. Kristančič]
UDC:	620.3:544.122.3(043.2)
COBISS:	234399491
Views:	76
Downloads:	14
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Chiroptical materials based on cellulose nanocrystals
Secondary abstract:	Chirality is a characteristic of asymmetric structures that allows for the interpretation of two non-superimposable mirror images of a structure. Chiral media have different phase velocities for left- and right-handed circular polarizations, resulting in asymmetric inten- sity or absorption of polarized light, which behaves as chiroptical activity. In my thesis, I examined the development of chiroptical materials based on cellulose nanocrystals. I was focused on the development of new methods for the synthesis of cellulose nanocrystals. This includes researching techniques for precisely controlling their chirality during pro- duction. Different extraction methods also lead to considerable differences in efficiency. Some methods for controlling certain parameters in the structure include surface functionalization, measurement of the chiral nematic phase, and addition of chiral addi- tives during synthesis. Control of pH, temperature, and reaction time is crucial for achiev- ing optimal conditions in shaping chiral structures. In new methods, a high degree of control is necessary to ensure repeatability and accuracy in the production of cellulose nanocrystals.
Secondary keywords:	cellulose nanocrystals;chrioptical materials;self assembly;chirality;Celuloza;Nanostrukturni materiali;Univerzitetna in visokošolska dela;
Type (COBISS):	Bachelor thesis/paper
Study programme:	1000372
Thesis comment:	Univ. v Ljubljani, Fak. za kemijo in kemijsko tehnologijo, UNI Kemijsko inženirstvo
Pages:	1 spletni vir (1 datoteka PDF (35 str.))
ID:	26197440