Methocel® E50 was found to afford the best balance among different important items, i.e. process time, retarding ability, dimensions of the coated units and possibility of finely tuning the delay duration.
It is found that these ionic liquids, due to their strong electrostatic charges and hydrogen bond with water, could shift the equilibrium hydrate dissociation/stability curve to a lower temperature and, at the same time, retard the hydrate formation by slowing down the hydrate nucleation rate, thus are able to act as both thermodynamic and kinetic inhibitors.
Similar to dialkylimidazolium tetrafluoroborate investigated in our previous work, these ionic liquids are found to shift the equilibrium hydrate dissociation/stability curve to a lower temperature and, at the same time, retard the hydrate formation by slowing down the hydrate nucleation rate.
The reduced segmental mobility of polymer chains in glassy PHEMA hydrogels at ambient temperature well below its Tg of 115 °C lengthens the polymer molecular relaxation time and retards the diffusional mobility as well as the nucleation and crystallization rates of the entrapped molecularly dispersed drug, thus resulting in enhanced stability of such hydrogel-based solid dispersion systems.
Decentralized controller design problem for linear time-invariant retarded time-delay systems is considered.
Decentralized controller design problem for linear time-invariant retarded commensurate-time-delay systems is considered.
Decentralized controller design problem for linear time-invariant retarded incommensurate-time-delay systems is considered.
All IVDFs were measured using a time-resolved retarding field energy analyzer (RFEA) located in the substrate position.
It is shown that short term ageing can enhance the subsequent rate of crystallisation, but longer ageing times can retard the crystallisation process.
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