Synthesis and characterization of niobium modified montmorillonite and its use in the acid-catalyzed synthesis of β-hydroxyethers

2006 ◽  
Vol 311 ◽  
pp. 199-203 ◽  
Author(s):  
Jean Marcel R. Gallo ◽  
Sergio Teixeira ◽  
Ulf Schuchardt
Keyword(s):  
Synthesis And Characterization ◽  
Modified Montmorillonite ◽  
Acid Catalyzed

Lewis-acid catalyzed synthesis and characterization of novel castor fatty acid-based cyclic carbonates

RSC Advances ◽  
2016 ◽  
Vol 6 (31) ◽  
pp. 25703-25712 ◽  
Author(s):  
Naganna Narra ◽  
Badari Narayana Prasad Rachapudi ◽  
Sahithya Phani Babu Vemulapalli ◽  
Padmaja V. Korlipara
Keyword(s):  
Fatty Acid ◽  
Ricinoleic Acid ◽  
Lewis Acid ◽  
Lewis Acids ◽  
Synthesis And Characterization ◽  
Cyclic Carbonates ◽  
Molecular Rearrangement ◽  
Acid Catalyzed

Novel bio-based cyclic carbonates were synthesised from ricinoleic acid by intra molecular rearrangement of an epoxy carbonate ester with Lewis acids.

Colloidal Synthesis and Characterization of Optically Active ZnO/ZnS Core/Shell Nanocrystals

2007 ◽  
Vol 1035 ◽  
Author(s):  
Krishnaprasad Sankar ◽  
Brian A. Akins ◽  
Tosifa A. Memon ◽  
Nathan J. Withers ◽  
Shin T. Bowers ◽  
...  
Keyword(s):  
Surface Defect ◽  
Optically Active ◽  
Colloidal Synthesis ◽  
Synthesis And Characterization ◽  
Pl Spectra ◽  
Uv Emission ◽  
Zno Nanocrystals ◽  
Wet Chemical ◽  
Acid Catalyzed

AbstractZnO colloidal nanocrystals have been synthesized using two different approaches and characterized by HRTEM, EDS, and photoluminescence spectroscopy. ZnO nanocrystals synthesized from zinc alkoxy alkyl precursors in the MeIm/H2O coordinating solvent showed only visible surface-defect related emission in their PL spectra. No band-to-band UV emission was observed after ZnS coating of those ZnO nanocrystals. In contrast, a strong band-to-band UV emission dominated PL spectra of ZnO nanocrystals synthesized through wet-chemical acid-catalyzed esterification of zinc acetate.

Synthesis and characterization of cellulose acetate naphthoate with good ultraviolet and chemical resistance

e-Polymers ◽  
2017 ◽  
Vol 17 (4) ◽  
pp. 333-340 ◽  
Author(s):  
Jun Song ◽  
Mei Liu ◽  
Zhanping Yang ◽  
Songwei Xu ◽  
Bowen Cheng ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Chemical Structure ◽  
Chemical Resistance ◽  
Molar Ratio ◽  
Synthesis And Characterization ◽  
Cellulose Diacetate ◽  
H Nmr ◽  
Ultraviolet Resistance ◽  
Acid Catalyzed

AbstractCommercial cellulose diacetate with a degree of substitution (DS) of 2.45 was partly deacetylated to cellulose acetate (CA) with different DSs by acid-catalyzed hydrolysis and then reacted with 1-naphthoyl chloride (NpCl) to synthesize CA naphthoate (CANp). Fourier transform infrared and 1H-NMR were used to characterize the chemical structure of CANp. The DS of naphthoate moiety (DSCANp) could be varied from 0.18 to 0.98 by adjusting the molar ratio of –OH in CA unit to NpCl, the DS of CA (DSCA), and the reaction time and temperature. When DSCA was 2.01 and the molar ratio was 1:6, the maximum DSCANp of the product was achieved after a reaction at 80°C for 2 h. With the increase of DSCANp, the thermal stability decreased slightly whereas the anti-ultraviolet property was enhanced. Moreover, the obtained films containing CANp exhibited good ultraviolet resistance as well as chemical resistance.

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