RESUMO
Controlled crystallization, melting and vitrification are important fundamental processes in nature and technology. However, the microscopic details of these fundamental phenomena still lack understanding, in particular how the cooling rate and presence of a wall influence the crystal nucleation and glass formation. Thermoresponsive microgels provide the possibility to study phase transitions at the single-particle level, owing to the ability to tune the particle size with temperature. In this study, we employ composite microgels consisting of a hard core and a crosslinked poly(N-isopropyl acrylamide-co-methacrylic acid) shell to study the crystallization of dense suspensions of soft colloids near a wall using confocal microscopy. We investigate the effect of the cooling rate on the fluid-to-solid transition close to the sample wall. The structures formed during cooling range from glassy in the case of a rapid temperature quench to crystalline when a slow cooling rate is used. Detailed analysis of the final structure reveals that the cooling rate also sets the degree of alignment of the crystal domains with the wall as a result of a balance between homogeneous and heterogeneous crystal nucleation. The results presented here yield valuable insight into the microscopic details of temperature-controlled crystallization near a wall. This understanding will help pave the way towards optimal crystallization conditions for microgel applications.
RESUMO
OBJECTIVE: To examine the association between place of origin and principal place of practice (PPP) of domestic Tasmanian health graduates who received end-to-end training with the University of Tasmania (UTAS). METHODS: The 2022 PPP for all UTAS domestic Tasmanian graduates from medicine, nursing, pharmacy, psychology, medical radiation science and paramedicine between 2011 and 2020 was identified using the online Australian Health Practitioner Regulation Agency (Ahpra) registration database. The graduate's place of origin (home address at the time of course application), together with their 2022 PPP, was described using the Modified Monash Model (MM) classification system of remoteness. Data were analysed using STATA. RESULTS: Over the 10-year period, 4079 domestic Tasmanians graduated from health courses at UTAS, of which 3850 (94.4%) were matched to an Australian PPP. In all, 78.3% of graduates were working in Tasmania, while the remainder (21.7%) were employed interstate. Of those with a Tasmanian PPP, 81.4% were working in a regional setting (MM2), while 77.6% of interstate employed graduates recorded a metropolitan (MM1) PPP. Rural place of origin (MM3-7) was associated with rural employment (MM3-7) in both Tasmania (OR, 37.08; 95% CI 29.01-47.39, p < 0.001), and on the Australian mainland (OR, 21.4; 95% CI 17.4-26.3, p < 0.001). CONCLUSIONS: Most domestic Tasmanian origin UTAS health graduates contribute to the state's health workforce after qualifying. Further research is needed to explore PPP over time and to understand why some graduates are motivated to seek employment on the Australian mainland and in particular, metropolitan cities.