Volume phase synchronism in diffraction gratings: comparison for different situations

2001 ◽  
Author(s):  
Ivan Richter ◽  
Pavel Fiala ◽  
Petr Honsa
Keyword(s):  
Diffraction Gratings ◽  
Phase Synchronism ◽  
Volume Phase

Volume phase diffraction gratings in a KTP crystal

1991 ◽  
Vol 21 (3) ◽  
pp. 360-361 ◽  
Author(s):  
Evgenii M Dianov ◽  
V P Konyaev ◽  
Yu V Kurnyavko ◽  
Vladislav A Maslov ◽  
A M Prokhorov ◽  
...  
Keyword(s):  
Diffraction Gratings ◽  
Volume Phase ◽  
Ktp Crystal

Triply-responsive OEG-based microgels and hydrogels: Regulation of swelling ratio, volume phase transition temperatures and mechanical properties

2021 ◽  
Author(s):  
Dongdong Lu ◽  
Mingning Zhu ◽  
Jing Jin ◽  
Brian R. Saunders
Keyword(s):  
Phase Transition ◽  
Biomedical Engineering ◽  
Volume Phase Transition ◽  
Swelling Ratio ◽  
Transition Temperatures ◽  
Ph Responsive ◽  
Network Systems ◽  
Volume Phase ◽  
Phase Transition Temperatures ◽  
Volume Swelling

Thermally- and pH-responsive microgels (MGs) and hydrogels are fascinating network systems that have been applied in biomedical engineering and sensing. The volume-swelling ratio (Q) and the volume-phase transition temperatures (VPTTs)...

scholarly journals Accounting for Cooperativity in the Thermotropic Volume Phase Transition of Smart Microgels

Gels ◽  
2021 ◽  
Vol 7 (2) ◽  
pp. 42
Author(s):  
Simon Friesen ◽  
Yvonne Hannappel ◽  
Sergej Kakorin ◽  
Thomas Hellweg
Keyword(s):  
Phase Transition ◽  
Interaction Parameter ◽  
Quantitative Description ◽  
Water Molecules ◽  
Volume Phase Transition ◽  
Network Chain ◽  
Solvent Interaction ◽  
Volume Phase ◽  
The Cross ◽  
Interaction Parameter Χ

A full quantitative description of the swelling of smart microgels is still problematic in many cases. The original approach of Flory and Huggins for the monomer–solvent interaction parameter χ cannot be applied to some microgels. The reason for this obviously is that the cross-linking enhances the cooperativity of the volume phase transitions, since all meshes of the network are mechanically coupled. This was ignored in previous approaches, arguing with distinct transition temperatures for different meshes to describe the continuous character of the transition of microgels. Here, we adjust the swelling curves of a series of smart microgels using the Flory–Rehner description, where the polymer–solvent interaction parameter χ is modeled by a Hill-like equation for a cooperative thermotropic transition. This leads to a very good description of all measured microgel swelling curves and yields the physically meaningful Hill parameter ν. A linear decrease of ν is found with increasing concentration of the cross-linker N,N′-methylenebisacrylamide in the microgel particles p(NIPAM), p(NNPAM), and p(NIPMAM). The linearity suggests that the Hill parameter ν corresponds to the number of water molecules per network chain that cooperatively leave the chain at the volume phase transition. Driven by entropy, ν water molecules of the solvate become cooperatively “free” and leave the polymer network.

scholarly journals Spectral multiplexing using stacked volume-phase holographic gratings – I

2017 ◽  
Vol 469 (2) ◽  
pp. 2412-2422 ◽  
Author(s):  
A. Zanutta ◽  
M. Landoni ◽  
M. Riva ◽  
A. Bianco
Keyword(s):  
Holographic Gratings ◽  
Volume Phase ◽  
Spectral Multiplexing
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