A5012965769- Phase Change Materials Research
- Adsorption and Cooling Systems
- Nonlinear Optical Materials Research
- Thermal Expansion and Ionic Conductivity
- Luminescence Properties of Advanced Materials
- Chemical Thermodynamics and Molecular Structure
- Molecular Sensors and Ion Detection
- Inorganic Fluorides and Related Compounds
- Supramolecular Chemistry and Complexes
- Lanthanide and Transition Metal Complexes
- Zeolite Catalysis and Synthesis
- Transition Metal Oxide Nanomaterials
- Perovskite Materials and Applications
- Photochemistry and Electron Transfer Studies
- Nuclear materials and radiation effects
- Chemical Synthesis and Characterization
- Crystal Structures and Properties
- Solid-state spectroscopy and crystallography
- Porphyrin and Phthalocyanine Chemistry
Universidade Federal do Maranhão
2020-2024
Tutton salts form an isomorphic crystallographic family that has been intensively investigated in recent decades due to their attractive thermal and optical properties. In this work, we report four mixed crystals (obtained by the slow solvent evaporation method) with novel chemical compositions based on K2V1−xM’x(SO4)2(H2O)6, where M’ represents Co, Ni, Cu, Zn, aiming at thermochemical energy storage applications. Their structural properties were correlated theoretical studies. The crystal...
In this paper, a novel mixed Tutton salt (K0.86Na0.14)2Ni(SO4)2(H2O)6 was successfully synthesized as single crystal and evaluated thermochemical heat storage material. Its thermal properties were correlated with the structure, which determined by powder X-ray diffraction using Le Bail Rietveld methods. The elemental ratio between K+ Na+ monovalent cations established energy-dispersive spectroscopy. Similar compounds such Na2Ni(SO4)2(H2O)4 K2Ni(SO4)2(H2O)6 also used for structural...
In this paper, an expanded experimental study (structural, thermal, vibrational, and optical) of kröhnkite Na2Mn(SO4)2(H2O)2 crystal, as well first-principle theoretical calculations, are presented discussed. Calculations based on the density-functional perturbation theory (DFPT) used to determine inter- intra-molecular vibrational modes. The results indicate one hundred eleven optical phonon modes in 30-3070 cm−1 spectral range: 54 Raman 57 IR active Experimental spectra with their...
RESUMO A síntese de cristais semiorgânicos formados por aminoácidos e metais nos últimos anos tem ganhado maior atenção devido às propriedades estruturais vibracionais promissoras destas moléculas. Neste âmbito, este trabalho visou à um monocristal L-Treonina complexado com o íon Cu2+ pelo método evaporação lenta do solvente, bem como estudo das estruturais, vibracional térmica. O material foi obtido após 30 dias em pH 5.8. Verificou-se meio da Difração raios X que cristal sintetizado possui...