https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47692 Wed 25 Jan 2023 08:43:05 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:55190 Wed 24 Apr 2024 12:59:00 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51167 Wed 23 Aug 2023 17:30:44 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40950 Wed 20 Jul 2022 13:51:23 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:33530 Wed 14 Nov 2018 16:20:31 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:23812 Wed 11 Apr 2018 16:50:11 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:13676 Wed 11 Apr 2018 14:44:49 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24891 -3. The materials used were poly(methyl methacrylate) (PMMA), glass, and anatase. The interaction of the bubbles, once brought into contact, was monitored using high-speed video recording. Visual inspection indicated that denser particles were more easily displaced during the contact of the bubbles and therefore the PMMA particles provided a particle barrier more resistant to coalescence. The coalescence events yielded information on the surface properties of the bubble and the detachment of particles. The attached particles commonly dampen the oscillation of the coalesced bubbles through viscous drag and change in the surface properties (e.g., area-exclusion principle). The dampening of the oscillation generally leads to a reduced mass of particles detaching from the bubble surface. It was found that the different materials investigated did not offer clear evidence of the effect of particle detachment on the bubble surface properties in the present systems. On the other hand, the detachment of different particle materials seemed to be consistent with one another when comparing the attachment and detachment forces exerted on the particles based on their density, size, and hydrophobicity. It was concluded that particles of lower density are more effective in stabilizing interfaces, and thus particle density is an important parameter in the selection of materials for the handling of dispersions.]]> Wed 11 Apr 2018 13:00:50 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24298 Wed 11 Apr 2018 12:59:15 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:34085 Wed 06 Feb 2019 16:16:37 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:30410 Wed 04 Sep 2019 09:39:34 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49011 Wed 03 May 2023 12:24:44 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50426 Tue 25 Jul 2023 18:47:32 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27770 Tue 25 Jul 2023 15:05:44 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:32551 Tue 23 Jun 2020 15:10:43 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:35318 Tue 23 Jul 2019 11:43:30 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50954 Tue 22 Aug 2023 11:32:00 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43461 2O₃), goethite (FeO(OH)) and silica (SiO₂). Pure mineral samples were sieved to the 63 - 90 mum size fraction and tested using our custom-made electrostatic agglomeration rig. A dry particle bed of 2 - 5 mg was formed on a glass slide on a metal charging plate and the bed raised toward a pendent, earthed water droplet at 50 µm·s^-1. The particles transfer, or jump, to the droplet as the electric field between the bed and droplet changes during approach, resulting in a net force on the particles. At applied voltages ranging from 1.5 - 3.0 kV the separation between the bed and particles when the particles were first observed to transfer was monitored. For each mineral the separation increased with applied voltage due to increased electric field strength. Pure goethite transferred most readily at all voltages as the drop-bed separation distance when the first particle was observed to jump was the greatest, whereas haematite and silica behaved similarly. High cohesion between goethite and haematite particles in mixed particle beds of both minerals resulted in particles transferring to the drop at separations between those observed for beds of the pure minerals. Careful determination of mineral composition of the dry bed and the transferred particle sample will indicate whether this approach may have potential application as a "rougher"-type step in the separation of goethite from haematite.]]> Tue 20 Sep 2022 08:42:32 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:13677 Tue 16 Jan 2024 16:24:28 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43172 Tue 13 Sep 2022 16:03:37 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54214 Tue 13 Feb 2024 12:01:51 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51634 Tue 12 Sep 2023 20:16:27 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48658 Tue 06 Feb 2024 15:26:51 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43868 Tue 04 Oct 2022 12:28:47 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:34874 Tue 03 Sep 2019 18:01:08 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39915 Thu 30 Jun 2022 11:41:32 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36046 Thu 30 Jan 2020 14:07:08 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50504 Thu 27 Jul 2023 12:56:38 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39194 Thu 26 May 2022 15:47:31 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51171 Thu 24 Aug 2023 14:33:44 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51175 Thu 24 Aug 2023 14:33:18 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:37370 Thu 22 Oct 2020 13:19:04 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41045 Thu 21 Jul 2022 14:42:22 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50339 Thu 20 Jul 2023 11:53:13 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47189 Thu 18 May 2023 14:48:16 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:43354 Thu 15 Sep 2022 15:32:33 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:54293 Thu 15 Feb 2024 14:47:12 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44431 Thu 13 Oct 2022 09:58:34 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41706 Thu 11 Aug 2022 15:10:20 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:31340 Sat 24 Mar 2018 08:44:37 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:8104 Sat 24 Mar 2018 08:40:04 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:6999 Sat 24 Mar 2018 08:37:48 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:7624 Sat 24 Mar 2018 08:34:45 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:7970 Sat 24 Mar 2018 08:33:40 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:13338 Sat 24 Mar 2018 08:17:03 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:9984 Sat 24 Mar 2018 08:14:25 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:9908 Sat 24 Mar 2018 08:07:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:20837 Sat 24 Mar 2018 08:05:57 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:19915 Sat 24 Mar 2018 08:03:46 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:19916 Sat 24 Mar 2018 08:03:45 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:20856 a, the PDEA brush exhibited a critical conformational change in the range 0.5-1 mM electrolyte, a range much narrower than predicted by the theory of the osmotic brush regime. This behavior is attributed to the hydrophobicity of the collapsed brush. The swelling and collapse kinetics for this salt-induced transition are nearly identical. This is in contrast to the asymmetry in the rate of the pH-induced response, suggesting an alternative mechanism for the two processes dependent on the nature of the environmental trigger.]]> Sat 24 Mar 2018 08:02:52 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21783 Sat 24 Mar 2018 08:00:40 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:20742 Sat 24 Mar 2018 08:00:23 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21143 Sat 24 Mar 2018 08:00:19 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:19606 Sat 24 Mar 2018 07:58:23 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:19729 Sat 24 Mar 2018 07:53:45 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:18805 Sat 24 Mar 2018 07:51:06 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:5017 Sat 24 Mar 2018 07:44:09 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27352 Sat 24 Mar 2018 07:39:37 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29256 a. Furthermore, the simulations reveal that the addition of a single Flory-Huggins interaction parameter analogous to the hydrophilicity of the counterion is sufficient to replicate the observed specific anion response of a hydrophobic weak polyelectrolyte brush.]]> Sat 24 Mar 2018 07:39:15 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:25268 Sat 24 Mar 2018 07:38:20 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29364 Sat 24 Mar 2018 07:34:14 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29275 Sat 24 Mar 2018 07:32:50 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27182 in situ ellipsometry and a quartz crystal microbalance with dissipation (QCM-D). At low pH the tertiary amine groups of the three polymers are protonated and all three brushes are significantly solvated and swell by adopting an extended conformation. As the pH is increased the weak polybasic brushes become increasingly deprotonated and collapse via solvent expulsion. By employing high temporal resolution measurements we have found that monomer hydrophobicity has a direct influence on the dynamics of this pH-response. The most hydrophobic poly(2-diisopropylamino)ethyl methacrylate (poly(DPA)) brush exhibits the fastest maximum swelling rate. This maximum swelling rate is reduced with decreasing monomer hydrophobicity for the 2-diethylamino, and even further for the 2-dimethylamino analogues. For all three brushes, the corresponding collapse transition is slower and compounded by an induction time that decreases with monomer hydrophobicity. Here also, the maximum collapse rate is greatest for the most hydrophobic polymer. This domination of the pH-response kinetics by monomer hydrophobicity is attributed to attractive hydrophobic forces between polymer segments overcoming the repulsive electrostatic forces between the tertiary amine residues.]]> Sat 24 Mar 2018 07:31:40 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29931 Sat 24 Mar 2018 07:30:56 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29774 Sat 24 Mar 2018 07:30:31 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:28229 Sat 24 Mar 2018 07:28:39 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26399 Sat 24 Mar 2018 07:28:00 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:28104 Sat 24 Mar 2018 07:24:56 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:4435 Sat 24 Mar 2018 07:22:47 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:4450 Sat 24 Mar 2018 07:18:06 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:4446 Sat 24 Mar 2018 07:18:05 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24475 Sat 24 Mar 2018 07:17:26 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24474 Sat 24 Mar 2018 07:17:26 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:25145 Sat 24 Mar 2018 07:17:10 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:25103 Sat 24 Mar 2018 07:15:01 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:24650 Sat 24 Mar 2018 07:11:53 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:23138 Sat 24 Mar 2018 07:10:25 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:34971 Mon 27 May 2019 16:58:55 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51970 Mon 25 Sep 2023 10:03:17 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29302 Mon 21 Aug 2017 11:04:02 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:18676 Mon 20 Jul 2015 17:34:33 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51979 Mon 13 Nov 2023 08:48:07 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:51170 Mon 13 Nov 2023 08:46:57 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:46960 Mon 12 Dec 2022 11:04:27 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:40383 2MA), a thermoresponsive polymer with a lower critical solution temperature of ~28 ℃, and poly(2-(diethylamino)ethyl methacrylate) (PDEA), a weak polybase with an apparent pKa of ~7.5, have been statistically copolymerized using activators continuously regenerated via electron transfer atom transfer radical polymerization to form multi-stimulus-responsive polymer brushes. The stimulus-responsive behavior of these brushes has been investigated with ellipsometry and numerical self-consistent field (nSCF) theory. The pH- and thermoresponsive behaviors of a PDEA homopolymer brush were investigated experimentally in order to benchmark the nSCF theory calculations. nSCF theory was able to reproduce the responsive behavior of PDEA and PMEO₂MA homopolymer brushes. Three copolymer compositions (90:10, 70:30, and 50:50 mol % MEO₂MA:DEA) were investigated experimentally with pH ramps performed at low and high temperatures and temperature ramps performed at low and high pH. A broader range of compositions were investigated with nSCF theory and compared to the experimental results, with the nSCF calculations able to capture the general behavior of the homopolymer and copolymer brushes. The responsive behavior of each brush to a given stimulus (temperature or pH) was dependent on both the polymer composition and environment (temperature or pH). The influence of pH on the brush increased with higher DEA mol % with a copolymer brush response transitioning from temperature-dominant to pH-dominant. The temperature response of PMEO₂MA was completely masked at low and high pH values by the presence of at least 30 mol % polybase in the copolymer.]]> Mon 11 Jul 2022 11:00:49 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:48836 Mon 10 Apr 2023 10:42:45 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:49244 Mon 08 May 2023 10:21:31 AEST ]]> https://ogma.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://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:33531 Fri 28 Jun 2019 11:32:06 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29257 Fri 28 Jun 2019 11:25:07 AEST ]]> https://ogma.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://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:39206 N-isopropylacrylamide) (PNIPAM) brushes is investigated as a function of confining stress and system temperature using neutron reflectometry (NR), numerical self-consistent field theory, and the reanalysis of colloid probe atomic force microscopy (AFM) data from the literature. For NR experiments, confinement is achieved using a custom-made sample environment, and the corresponding reflectometry data are analyzed using a novel “distribution model.” The NR and AFM experiments probe similar temperature–stress combinations and generally find qualitative agreement, with some variations highlighting path-dependent (isostress vs isothermal, respectively) behavior. All techniques indicate that confinement removes the critical transition point in the thermoresponse of PNIPAM and results in the brush assuming a block-like volume fraction profile with a uniform internal structure. The PNIPAM brushes recover from such treatment, regaining their thermoresponse upon resolvation. Understanding the structure of responsive polymer brushes under confinement is essential, as brush applications are often accompanied by a surface-normal force (i.e., lubrication) and brush properties are dependent on their structure.]]> Fri 27 May 2022 09:52:26 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:36712 Fri 26 Jun 2020 09:26:42 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:33974 Fri 25 Jan 2019 14:41:59 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:42233 3COO, causes collapse) and thiocyanate (KSCN, causes swelling), two ions at opposite ends of the Hofmeister series, has been monitored with neutron reflectometry (NR) and quartz crystal microbalance with dissipation (QCM-D). These techniques revealed that the balance of the swelling/collapse influence of the two ions on the structure of the brush is temperature dependent. At low temperatures in mixed salt environments, the influence of the acetate and thiocyanate ions appears additive, antagonistic and approximately equal in magnitude, with brush thickness and dissipation similar to the brush in the absence of electrolyte. At higher temperatures, the influence of the acetate ion diminishes, resulting in an increase in the relative influence of the thiocyanate ion on the brush conformation. These temperature dependent specific ion effects are attributed to increased steric crowding in the brush, along with an increased affinity of the thiocyanate ion for the polymer at higher temperatures.]]> Fri 19 Aug 2022 11:42:19 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:44487 co-2-(diethylamino)ethyl methacrylate) [P(MEO₂MA-co-DEA)] 80:20 mol % copolymer brushes were synthesized on planar silica substrates via surface-initiated activators continuously regenerated via electron transfer atom transfer radical polymerization. Brush thickness was sensitive to changes in pH and temperature as monitored with ellipsometry. At low pH, the brush is charged and swollen, while at high pH, the brush is uncharged and more collapsed. Clear thermoresponsive behavior is also observed with the brush more swollen at low temperatures compared to high temperatures at both high and low pH. Neutron reflectometry was used to determine the polymer volume fraction profiles (VFPs) at various pH values and temperatures. A region of lower polymer content, or a depletion region, near the substrate is present in all of the experimental polymer VFPs, and it is more pronounced at low pH (high charge) and less so at high pH (low charge). Polymer VFPs calculated through numerical self-consistent field theory suggest that enrichment of DEA monomers near the substrate results in the experimentally observed non-monotonic VFPs. Adsorption of DEA monomers to the substrate prior to initiation of polymerization could give rise to DEA segment-enriched region proximal to the substrate.]]> Fri 14 Oct 2022 08:57:26 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:47365 Fri 13 Jan 2023 14:57:40 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:50202 Fri 07 Jul 2023 09:49:26 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:42771 2MA) and poly(2-(diethylamino)ethyl methacrylate) (PDEA), as well as a P(MEO₂MA-co-DEA) copolymer brush of 90:10 mol% composition has been examined. PMEO₂MA is a thermoresponsive polymer with a lower critical solution temperature of ~28 °C, PDEA a weak polybase with an apparent pK_a of ~7.5, while the copolymer brush exhibits both pH and temperature responsive behaviour. Brushes were synthesised using surface initiated ARGET ATRP. The effect of temperature at low and high pH in the presence of different electrolytes on the thickness of the P(MEO₂MA-co-DEA) 90:10 mol% brush was tracked with ellipsometry and the polymer volume fraction profile was elucidated with neutron reflectometry. The effect of each electrolyte on the copolymer brush conformation as the temperature changes could be switched by changing the pH from low (charged DEA segments) to high (uncharged DEA segments). The overall behaviour of the copolymer in each salt was PDEA-like at low pH, and MEO₂MA-like at high pH. At low pH a reverse Hofmeister effect was observed, while at high pH a direct Hofmeister effect was observed.]]> Fri 02 Sep 2022 10:32:17 AEST ]]>