https://nova.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33528 Tue 03 Sep 2019 17:57:15 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:31340 Sat 24 Mar 2018 08:44:37 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:23138 Sat 24 Mar 2018 07:10:25 AEDT ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:27512 Mon 23 Sep 2019 14:23:33 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33636 Mon 23 Sep 2019 12:18:04 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:24518 in situ ellipsometry, quartz crystal microbalance with dissipation (QCM-D) and static contact angle measurements between 20 and 45 °C in the presence of up to 250 mM acetate and thiocyanate anions in water. The thickness and changes in dissipation exhibited a broad swelling transition spanning approximately 15 °C from collapsed (high temperatures) to swollen conformation (low temperatures) while the brush surface wettability changed over approximately 2 °C. In the presence of the kosmotropic acetate anions, the measured lower critical solution temperature (LCST) by the three techniques was very similar and decreased linearly as a function of ionic strength. Conversely, increasing the concentration of the chaotropic thiocyanate anions raised the LCST of the pNIPAM brushes with variation in the measured LCST between the three techniques increasing with ionic strength. The thickness of the pNIPAM brush was seen to progressively increase with increasing thiocyanate concentration at all temperatures. It is proposed that specific ion binding of the chaotropic thiocyanate anion with pNIPAM amide moieties increases the electrostatic intra- and intermolecular repulsion within and between pNIPAM chains. This allows the brush to begin to swell at higher temperatures and to an overall greater extent.]]> Fri 28 Jun 2019 11:04:06 AEST ]]>