izpis_h1_title_alt

Photoregulation of molecular assembly in thin surface films
Ličen, Matjaž (Author), Drevenšek Olenik, Irena (Mentor) More about this mentor... This link opens in a new window

.pdfPDF - Presentation file, Download (38,43 MB)
MD5: 4893A6C537F0D0681276B92D62D46E36

Abstract
The versatility and many appealing properties of DNA nucleobase derivatives have made them the target of investigations for use in a wide range of possible applications: from medicine to novel materials for nanotechnology and biocompatible electronics. By modifying a nucleobase with a photoactive moiety, one is able to control the binding between nucleobases by irradiating the molecules with light of specific wavelengths. In this doctoral thesis, I present the results of the studies of the behaviour of three azo-functionalised guanosine derivatives in thin surface films at the air-water interface and after transfer to solid substrates by using the Langmuir-Blodgett method. Even though the studied molecules did not possess a typical amphiphilic structure, we found that all of them formed sufficiently stable films at the air-water interface. Furthermore, optical irradiation induced changes in the measured properties of the films, and could be used to reversibly switch the films from one state to the other using two different wavelengths of light. Finally, a phenomenological model was developed to describe the time dependence of surface pressure in a Langmuir film during irradiation with actinic light. Using this model, we were able to show that the behaviour of a mixed guanosine–cytidine film during irradiation was consistent with photoinduced inhibition of hydrogen bonds.

Language:English
Keywords:DNA nucleotides, photoisomerization, azobenzene, Langmuir films, Langmuir-Blodgett films, hydrogen bonding
Work type:Doctoral dissertation (mb31)
Tipology:2.08 - Doctoral Dissertation
Organization:FMF - Faculty of Mathematics and Physics
Year:2020
COBISS.SI-ID:23962627 This link opens in a new window
Views:270
Downloads:120
Metadata:XML RDF-CHPDL DC-XML DC-RDF
 
Average score:(0 votes)
Your score:Voting is allowed only to logged in users.
:
Share:AddThis
AddThis uses cookies that require your consent. Edit consent...

Secondary language

Language:Slovenian
Title:Fotoregulacija urejanja molekul v tankih površinskih slojih
Abstract:
Derivati nukleobaz so zaradi svoje vsestranskosti predmet raziskav na mnogih področjih, kot so medicina, biologija, znanost materialov, biokompatibilna elektronika ipd. Modifikacija nukleobaz s fotoaktivnimi skupinami omogoča optično regulacijo vodikovih vezi, ki se tvorijo med nukleobazami, kar pomeni, da lahko lastnosti takih materialov preklapljamo, tako da jih osvetlimo s svetlobo primerne valovne dolžine. V tem doktorskem delu so predstavljeni rezultati študij obnašanja treh azo-funkcionaliziranih derivatov gvanozina v tankih površinskih slojih, tako na vodni površini kot po prenosu na trdne substrate s tehniko Langmuir-Blodgett. Kljub temu, da preučevane molekule nimajo tipične amfifilne strukture, se je izkazalo, da so molekulski filmi, ki jih te molekule tvorijo na vodni površini, dovolj stabilni, da je mogoče preučevati vpliv svetlobe na njihove lastnosti. Tako smo lahko izmerili reverzibilno spreminjanje lastnosti filmov, tako na vodni površini kot na trdnih substratih, pri osvetljevanju z UV in vidno svetlobo. Za opis spreminjanja površinskega tlaka pri osvetljevanju z UV svetlobo smo razvili matematični model na osnovi 2D Van der Waalsove enačbe stanja. Razviti model se ujema z izmerjenimi fotoinduciranimi spremembami površinskega tlaka v filmih sestavljenih iz mešanice derivatov dveh nukleobaz, analiza izmerjenih podatkov preko tega modela pa nakazuje, da pri optičnem osvetljevanju filma iz derivatov gvanozina in citidina pride do reverzibilnega razdiranja vodikovih vezi med nukleobazami.

Keywords:nukleotidi, fotoizomerizacija, azobenzen, Langmuirjevi sloji, sloji Langmuir-Blodgett, vodikova vez

Similar documents

Similar works from RUL:
Similar works from other Slovenian collections:

Comments

Leave comment

You have to log in to leave a comment.

Comments (0)
0 - 0 / 0
 
There are no comments!

Back