Temperature-induced phase transitions

Melting is only one of many processes that nanocrystals can undergo when they are heated. Temperature-induced phase transitions are equally important in nanocrystals, especially in covalent materials such as oxides [210]. 

New pH/temperature-sensitive polymer systems with transitions resulting from both polymer-polymer and polymer-water interactions have been demonstrated and their pH/temperature-induced phase transition has been investigated. Intra/intermolecular interactions via hydrogen bond play an important role in determining the phase transition. By manipulating the... 

Going back to the physical properties, it should be mentioned that vesicles can be seen as a microphase, which can undergo temperature-induced phase transitions. Thus, liposomes can pass from amore ordered state at low temperature (the so-called... 

Figure 9.24 Temperature-induced phase transitions in the bilayer of liposomes ...

Kitzerow et al. recently demonstrated that temperature-induced phase transitions (Iso-N) and electric field-induced reorientation of a nematic liquid crystal (5CB in this case) can be used to tune photonic modes of a microdisc resonator, in which embedded InAs quantum dots serve as emitters feeding the optical modes of the GaAs-based photonic cavity [332],... 

Chen, G. and A. S. Hoffman. 1995. Grafted copolymers that exhibit temperature-induced phased transitions over a wide range of phNature373 49-52. 

Temperature-Induced Phase Transitions in Langmuir-Blodgett... 

FIGURE 1.15 Temperature-induced phase transition between the gel and crystalline phases of n-butylammonium vermiculite at an external salt concentration of c = 0.01 M A = 17 A. 

Chen G, Hoffinan AS (1995) Graft copolymers that exhibit temperature-induced phase transitions over a wide range of pH. Nature 373 49-52... 

Temperature-induced phase transitions are typically associated with small volume changes so that the change of the internal energy is dominated by the entropy term TAS. For pressure-induced phase transitions with volume changes of the order of 10%, the PAF term dominates and the entropy term can be neglected at room temperature. The corresponding work AW is defined as ... 

Chemical methods can also be applied for the measurement of the interior temperature of microsystems. A fluorescent molecular thermometer using temperature-induced phase transitions seems to be quite attractive,but it needs a transparent window on the wall of the microchannel for the optical measurement. However, this may change the heat transfer ability of the wall. 

The reliability of these two-dimensional connectivity experiments is now well enough established that they can be used with confidence in the investigation of unknown structures in conjunction with diffraction studies. In a first step in this direction, a study of the three-dimensional bonding connectivities in ZSM-11 in both its high- and low-temperature forms has been reported [86]. As described earlier these are related to each other by a temperature-induced phase transition. The high-temperature form is known to have tetragonal symmetry with space... 

The effect of s—d hybridization on the relative stability of the structures of metallic Ca and Sr has been studied as a function of temperature and pressure within the context of the pseudopotential theory for metals. The inclusion of hybridization is found to favour the f.c.c. structure at all pressures and, in particular, is necessary to explain the observed f.c.c. structure in these metals at zero temperature and pressure. Phase boundaries are calculated by equating the free energy of the f.c.c. structure to that of the b.c.c. structure. Temperature-induced phase transitions are predicted to occur at 555 K in Ca and 625 K in Sr as compared with the actual temperatures of 721 and 830 K. From the changes in free energy of the reactions of the alkaline-earth metals with gases as a function of temperature, it is confirmed that at 298— 1400 K almost all of the residual gases in electrovacuum devices combine with the metals to form stable compounds. The dehydration of calcium... 

The study of temperature effects (see Section 1.4.2), which has already begun, should continue to explore both the possible existence of temperature-induced phase transitions and surface stability issues in materials of technological importance. 

STA Starovoytova, L., Spevacek, J., and llavsky, M., H-NMR study of temperature-induced phase transitions in D2O solutions of polyfA-isopropylmethaciylamide)/ poly(A-isopropylacrylamide) mixtures and random copolymers. Polymer, 46, 677, 2005. 

Comments The last three data points are temperature-induced phase transitions. ... 

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