Detection of Phase Transition in Photosensitive Liposomes by Advanced QCM

Lauri Viitala, Tatu Lajunen, Arto Urtti, Tapani Viitala, Lasse Murtomäki*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)


In this work an impedance-based quartz crystal microbalance (QCM) is used to detect heat-induced changes in the viscoelastic properties in the films of adsorbed liposomes. Liposomes are bound to a polymer-modified QCM surface, and heat is induced in the bilayer via light absorption into gold nanoparticles (GNPs) embedded in the liposomes. Because of very rapid heat transfer at the nanoscale, nanoparticles can reside either in the liposome cavity or within the bilayer to cause changes in the lipid viscoelasticity. The changes are observed as changes in the film relaxation time as well as by mapping the measured resonance frequency versus resistance. The QCM results indicate that viscoelastic changes occur throughout the vesicle layer, possibly causing fusion between the liposomes. The ultimate goal of the work is to develop a smart drug delivery system for the eye, whereby a drug loaded in the liposome can be released in a controlled manner by light triggering.

Original languageEnglish
Pages (from-to)21395-21403
Number of pages9
JournalJournal of Physical Chemistry C
Issue number37
Publication statusPublished - 17 Sept 2015
Externally publishedYes
MoE publication typeA1 Journal article-refereed


Dive into the research topics of 'Detection of Phase Transition in Photosensitive Liposomes by Advanced QCM'. Together they form a unique fingerprint.

Cite this