G10: Functional dyes and related materials
The research team specialized in synthesis and characterization of chromogenic materials has a solid background in applied color science with a significant expertise in dyes and pigments technology. Besides chromogenic materials based on classical dyes and pigments and their applications, our current concerns are centred on functional dyes, including hybrid structures for stimulated color changing materials, luminophores, and colorants for manipulation of light and energy transfer with suitable properties for emerging technologies (metamaterials, multifunctional structures, holography, organic conductors, light concentrators or E-textiles). Research areas: a) Synthesis of innovative materials based on functional dyes and pigments (stimulated color changing materials, luminescent systems for energy transfer, adaptive systems for light manipulation); b) Hybrid organic-inorganic coloring materials and film-forming materials for rigid and flexible substrates (photocatalytic coatings, anticorrosive film-forming materials, antireflective properties, resistant to overcoating); c) Conditioning of coloring materials as free flowing and easy dispersible powders, dispersion in liquid vehicles or by encapsulation in different matrices; d) Chemical structure investigation, evaluation of optical properties by molecular spectroscopy, color measurements and evaluation of color differences; e) Functionalization of textile materials (pretreatment, dyeing and finishing solutions, modifying of textile fabrics, providing functional effects — sensors, conductive, camouflage, self-cleaning).
Team vice-leader, Senior Researcher Ist degree
Scientific Research Assistant, PhD Stud.
M. Sci. Eng.
JASCO FTIR 6300 spectrometer
The spectrometer can be used for: Measurement in transmission (in KBr pellets, liquids and gases in specific cells); Total attenuated reflectance (ATR-FTIR) – Analysis of liquids, pastes, powders, films and flexible solids; FTIR specular reflectance – Measurement of liquid surfaces, thin films, thin layers of creams, pastes with double transmission on absorption test cards; thickness of plastic films, measurement of films on metal substrates; Diffuse Reflectance (DRIFT) – Analysis of powders, rough surfaces and fibers in mixtures with KBr; dilution-free analysis using an abrasive sampling kit; 80 degree angle reflection for thin film characterization.
JASCO V570 UV-VIS-NIR spectrophotometer
The spectrophotometer is used to measure: a) Absorbance or transmittance of a sample in the UV-VIS-NIR range; b) Film thickness calculation based on transmission and reflection spectra of thin films ; c) Transmittance of liquid and solid samples; d) Reflectance of solid samples; color analysis (tristimulus values, chromaticity coordinates, lightness, hue, chroma, color differences based on the XYZ Color System – CIE); e) Solar Direct Transmittance/reflectance measurement – calculates the transmittance and reflectance of both solar radiation and visible light ; f) Analyze thin films on planar surfaces.
JASCO FP6500 spectrofluorimeter
Spectrofluorimeter is used for: a) Recording emission and excitation fluorescence spectra on powders, films and liquids; b) Color fluorescence measurement – measures the reflectance (% R) of a fluorescent sample and calculates the tristimulus values, chromaticity coordinates, brightness index and chromaticity index according to the XYZ color specification system established by CIE; b) Calculation of the solid state quantum efficiency in the fluorescence emission spectrum using the standard reflectance spectrum and the emission spectrum of the sample (using an integrating sphere – ISF 513).
Zina Vuluga; Mihai Cosmin Corobea; Cristina Elizetxea; Mario Ordonez; Marius Ghiurea; Valentin Raditoiu; Cristian Andi Nicolae; Dorel Florea; Michaela Iorga; Raluca Somoghi; Bogdan Trica
Morphological and tribological properties of PMMA/halloysite nanocomposites
Polymers, Volume 10(8), August 2018, 69-76, DOI: 10.3390/polym10080816
Simona Caprarescu; Alexandra R. Miron; Violeta Purcar; Anita-Laura Radu; Andrei Sarbu; Cristian Andi Nicolae; Mihaela Pascu (Neagu); Daniela Ion-Ebrasu; Valentin Raditoiu
Treatment of Crystal Violet from Synthetic Solution Using Membranes Doped with Natural Fruit Extract
CLEAN – Soil, Air, Water, Volume 46(7), July 2018, DOI: 10.1002/clen.201700413
Elena Craciun; Luminita Predoana; Irina Atkinson; Ioana Jitaru; Elena M. Anghel,; Veronica Bratan; Catalina Gifu; Crina Anastasescu; Adriana Rusu; Valentin Raditoiu; Eugenia Vasile; Mihai Anastasescu; Ioan Balint; Maria Zaharescu
Fe3+-doped TiO2 nanopowders for photocatalytic mineralization of oxalic acid under solar light irradiation
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, Volume 356, April 2018, 18-28, DOI: 10.1016/j.jphotochem.2017.12.024
Valentin Raditoiu; Alina Raditoiu; Monica F. Raduly; Viorica Amariutei; Ioana C. Gifu; Mihai Anastasescu
Photocatalytic Behavior of Water-Based Styrene-Acrylic Coatings Containing TiO2 Sensitized with Metal-Phthalocyanine Tetracarboxylic Acids
COATINGS, Volume 7(12), December 2017, 69-76, DOI: 10.3390/coatings7120229
Valentin Raditoiu, Irina Elena Chican, Alina Raditoiu, Irina Fierascu, Radu Claudiu Fierascu, Petronela Fotea
Application of Fourier-Transform Infrared Spectroscopy (FTIR) for the Study of Cultural Heritage Artifacts
In: VR Technologies in Cultural Heritage, Part of the Communications in Computer and Information Science book series (CCIS, volume 904), SpringerOpen 2019, https://doi.org/10.1007/978-3-030-05819-7
Radu Claudiu Fierascu, Petronela Fotea, Cristian-Andi Nicolae, Valentin Raditoiu, Stefan Ovidiu Dima, Irina Fierascu
Characterization of wood artifacts
Practical examples regarding the valorization of cultural heritage through archaeometry studies using nuclear techniques and other scientific methods, Printech Publishing House, Bucharest 2018, Chapter 3, pages 97-134
Radu Claudiu Fierascu, Petronela Fotea, Cristian-Andi Nicolae, Valentin Raditoiu, Marius Ghiurea, Raluca Somoghi, Elvira Alexandrescu, Irina Fierascu
Characterization of historical textiles
Practical examples regarding the valorization of cultural heritage through archaeometry studies using nuclear techniques and other scientific methods, Printech Publishing House, Bucharest 2018, Chapter 2, pages 57-94
Raluca Somoghi, Bogdan Trica, Violeta Purcar, Radu Claudiu Fierascu
Study of wood artifacts by microscopy
In: Valorification of cultural heritage through archaeometry studies using nuclear techniques and other scientific methods, Printech Publishing House, Bucharest 2018, Chapter C.5, Pages 109-114
Valentin Raditoiu, Alina Raditoiu, Monica Raduly
Study of wood artifacts by Fourier transform infrared spectroscopy
In: Valorification of cultural heritage through archaeometry studies using nuclear techniques and other scientific methods, Printech Publishing House, Bucharest 2018, Chapter C.3, Pages 87-94