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Rafaela Raupp da Rosa is a Organic Synthetic Chemist who works with liquid crystalline compounds and its applications. She is currently working on Materials Research Center (CENIMAT) in the Faculdade de Ciências e Tecnologia at Universidade NOVA de Lisboa, with nanocellulose precursors and derivatives and its applications. She worked with the synthesis of high ordered smectic liquid crystals and bent-core liquid crystals at Universidade Federal do Rio Grande do Sul and University of Colorado Boulder during her graduate program. Her main focus is organic synthetic techniques applied to materials science an its potential application in electronic devices.
The colloidal suspensions of aqueous cellulose nanocrystals (CNCs) are known to form liquid crystalline systems above certain critical concentrations. From an isotropic phase; tactoid formation; growth; and sedimentation have been determined as the genesis of a high‐density cholesteric phase; which after drying; originates solid iridescent films. H...
Cellulose Nanocrystals Rod‐like cellulose nanocrystal aqueous colloidal suspensions can be prepared from eucalyptus kraft pulp. In article number 2108227, Maria Helena Godinho and co‐workers show the formation of a liquid crystalline (LC) phase atop an isotropic phase, inverted from the typical high‐density LC phase. The bounciness of the particles...
Bis-1,3-isophthalimines flanked by two side 3-aryl-5-perfluoroalkylisoxazoline or 3-aryl-5-perfluoroalkylisoxazol arms were produced and liquid crystal properties were analysed. Monotropic smectic A mesophase was found for bis-1,3-isophthalimines containing the 3-aryl-5-perfluorooctylisoxazoline (8b). Thermal behaviour was analysed and discussed by...
A series of novel thiourea and amide liquid crystals containing 5-membered isoxazoline and isoxazole rings were synthetized and the liquid crystal properties studied. Thioureas were obtained using a condensation reaction of benzoyl chlorides, arylamines and ammonium thiocyanate. The amides, on the other hand, were the byproduct of a quantitative re...
In this work, a series of isoxazolyl and tetrazolylcinnamic ester hybrid liquid crystals (HLCs) were synthesised and their mesomorphic behaviour was analysed. Cinnamic acid derivatives were prepared by Knoevenagel condensation of malonic acid and arylaldehydes. Five-membered tetrazoles and isoxazoles were prepared by [3 + 2] 1,3-dipolar cycloadditi...
The synthesis and liquid crystalline behaviour of new comb-shaped methacrylate oligomers, derived from a new key intermediate in the synthesis of heterocyclic liquid crystals, i.e., 3-(4-bromophenyl)-5-(4-hydroxyphenyl)isoxazole, are reported. These new thermotropic liquid crystals exhibit a smectic A mesophase (SmA) above a soft crystal phase (CrE...
This work describes the synthesis and characterization of a new liquid-crystalline compounds based on isoxazoles. Classical synthetic methodologies were employed in the preparation of this compounds, and the [3+2] 1,3-dipolar cycloaddition was the key step to prepare isoxazolines as precursors to isoxazoles. The structural and thermal characterizat...
A collection of isoxazoles derivatives has been efficiently synthesized in three steps. The oximation reaction of aldehydes followed by nitrile oxide [3+2] 1,3-dipolar cycloaddition and MnO2-oxidation reaction furnished the title compounds which were purified by simple filtration on celite®.