Linker-assisted structuration of tunable uranium-based hybrid lamellar nanomaterials

2020 ◽  
Vol 44 (20) ◽  
pp. 8463-8470 ◽  
Author(s):  
Elisa Ré ◽  
Xavier Le Goff ◽  
Guillaume Toquer ◽  
Jérôme Maynadié ◽  
Daniel Meyer
Keyword(s):  
Condensation Process ◽  
Hydrolytic Condensation

Linker-assisted formation of tunable uranium-based hybrid lamellar nano-sheets through a non-hydrolytic condensation process.

Alkoxymethylcyclosiloxanes - new efficient precursors of crystalline (CH3SiO3/2)8 silsesquioxane and polymethyl silsesquioxanes

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Anna Kowalewska ◽  
Krystyna Rózga-Wijas ◽  
Mirosław Handke
Keyword(s):  
Solvent Effect ◽  
Room Temperature ◽  
Condensation Process ◽  
Simple Method ◽  
Hydrolytic Condensation ◽  
Mild Conditions ◽  
Highly Efficient ◽  
Tetrabutylammonium Fluoride ◽  
Substantial Degree

AbstractA new, highly efficient and very simple method for the synthesis of pure octahedral methylsilsesquioxanes (CH3SiO3/2)8, from cyclic 2,4,6,8-tetraalkoxy- 2,4,6,8-tetramethylsiloxane, was developed. We have found that T8Me can be synthesized from a mixture of alkoxymethylcyclosiloxane isomers in the hydrolytic condensation process, utilizing an ionic catalyst - tetrabutylammonium fluoride (TBAF). The reaction was carried out under very mild conditions, at room temperature, in a variety of solvents of different polarity. A substantial solvent effect was observed. THF helped in the formation of pure T8Me, whereas in other solvents mixtures of T8Me and poly(methylsilsesquioxanes) (PMQS) of substantial degree of regularity, were obtained.

scholarly journals A MCDM Methodology to Determine the Most Critical Variables in the Pressure Drop and Heat Transfer in Minichannels

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2069
Author(s):  
Eloy Hontoria ◽  
Alejandro López-Belchí ◽  
Nolberto Munier ◽  
Francisco Vera-García
Keyword(s):  
Heat Transfer ◽  
Pressure Drop ◽  
Heat Exchangers ◽  
Saturation Pressure ◽  
Computational Cost ◽  
Urban Systems ◽  
Condensation Process ◽  
Geometrical Parameters ◽  
Maximum Heat ◽  
Maximum Heat Transfer

This paper proposes a methodology aiming at determining the most influent working variables and geometrical parameters over the pressure drop and heat transfer during the condensation process of several refrigerant gases using heat exchangers with pipes mini channels technology. A multi-criteria decision making (MCDM) methodology was used; this MCDM includes a mathematical method called SIMUS (Sequential Interactive Modelling for Urban Systems) that was applied to the results of 2543 tests obtained by using a designed refrigeration rig in which five different refrigerants (R32, R134a, R290, R410A and R1234yf) and two different tube geometries were tested. This methodology allows us to reduce the computational cost compared to the use of neural networks or other model development systems. This research shows six variables out of 39 that better define simultaneously the minimum pressure drop, as well as the maximum heat transfer, saturation pressure fluid entering the condenser being the most important one. Another aim of this research was to highlight a new methodology based on operation research for their application to improve the heat transfer energy efficiency and reduce the CO2 footprint derived of the use of heat exchangers with minichannels.

scholarly journals Influence of intensively boiling liquefied gas on hydrate formation in self-organizing boiling-condensation process

2018 ◽  
Vol 1128 ◽  
pp. 012035
Author(s):  
D S Elistratov ◽  
A V Meleshkin ◽  
M V Bartashevich ◽  
S L Elistratov ◽  
N V Mironova ◽  
...  
Keyword(s):  
Hydrate Formation ◽  
Condensation Process ◽  
Liquefied Gas ◽  
Self Organizing
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