https://nova.newcastle.edu.au/vital/access/ /manager/Index en-au 5 https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:55190 Wed 24 Apr 2024 12:59:00 AEST ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:33529 CH₃CO₂¯ > Cl¯ > NO̅₃ ~Br¯> I¯ > SCN¯ for the potassium series and Na⁺ > K⁺ > Cs⁺ > Li⁺ ~ NH⁺₄ for the chloride salts. The electrophoretic mobility of the modified particles in the presence of 100 mM potassium salts increased in magnitude as the brush layer collapsed and also with the chaotropic nature of the anion.]]> Fri 31 Jan 2020 16:50:10 AEDT ]]> 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 ]]> https://nova.newcastle.edu.au/vital/access/ /manager/Repository/uon:50202 Fri 07 Jul 2023 09:49:26 AEST ]]>