Ana‐Maria Albu

Universitatea Națională de Știință și Tehnologie Politehnica București

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Dan Sorin Vasilescu

Universitatea Națională de Știință și Tehnologie Politehnica București

Dumitru Mircea Vuluga

Romanian Academy

Bogdan Mărculescu

Xi’an Jiaotong-Liverpool University

Ionica Ioniţă

Valahia University of Targoviste

Nicoleta Preda

National Institute of Materials Physics

Anca Stănculescu

National Institute of Materials Physics

Cristiana Rădulescu

Valahia University of Targoviste

Edina Rusen

Universitatea Națională de Știință și Tehnologie Politehnica București

G. Socol

National Institute for Laser Plasma and Radiation Physics

Marcela Socol

National Institute of Materials Physics

Cooperative Institutions

University of Bucharest

Universitatea Națională de Știință și Tehnologie Politehnica București

National Institute of Materials Physics

Romanian Academy

Centre National de la Recherche Scientifique

Institutul Naţional de Cercetare Dezvoltare pentru Chimie si Petrochimie

Academy of Romanian Scientists

National Institute for Research and Development in Environmental Protection

National Institute for Research & Development in Informatics

National Institute for Laser Plasma and Radiation Physics

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New Trends in Architecture of Azo Polymer Materials with Applications in Optical Field. 2. Solvatochromic and Photochromic Investigation

Molecular Crystals and Liquid Crystals (2010)

Ana‐Maria Albu Ionica Ioniţă Maria Maganu Cristian Boscornea Dan Sorin Vasilescu

In the large family of polymers, the azobenzene derivatives represent one fascinating materials class, along with stylbene and azomethinic derivatives. This interest is explained by combination of the properties of anisotropy with the photoinduced behaviors. The photoinduced birefringence, relief grating, the high optical nonlinearity resulted from the sin-anti isomerism, molecular reorientation, the exceptional stability to writing and erasing by laser radiation, are just the most important arguments for their usage of these polymeric architectures in the NLO field as: LCD, chemical sensing, devices for storage and transmission of information. This presentation covers the development and characterization a new series of materials from viewpoint of the modification of the polymer materials by the chemical transformation of the "common" polymer support an underlining: solvatochromic and photorefractivity properties.

Solvatochromism

Azobenzene

10.1080/15421401003724142

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Citations (1)

Polymerization Process-Method for Control of Crystal Nucleation of Calcium Carbonate

Molecular Crystals and Liquid Crystals (2008)

Ana‐Maria Albu Nicoleta Doriana Stanciu Mihaela Mocioi

We report based of the new concept for controlling crystal polymorphs of CaCO3, entitled “latent inductor method”, [10 Naka , K. , Keum , D.-K. , Tanaka , Y. , & Chujo , Y. ( 2000 ). Chem. Comm. , 2000 , 1537 – 1538 .[Crossref] , [Google Scholar]] the results obtained by developing the crystallization in the same time with polymerizations process of methyl methacrylate. The crystalline form of product is discussed reported to analytical results obtained by FT-IR spectroscopy, X-ray, SEM. We discuss, in the same time, the particularity of polymeric assistant of crystallization process.

Crystal (programming language)

10.1080/15421400801904450

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Citations (0)

Preparation and Characterization of Polar Aniline Functionalized Copolymers Thin Films for Optical Non-Linear Applications

Ferroelectrics (2009)

Anca Stănculescu Oana Rasoga Nicoleta Preda Marcela Socol F. Stǎnculescu

This paper presents a study of two monomeric structures containing functional groups with different electronegativities [NH/NH-NH and NO2] and two different polymeric structures prepared by the copolymerisation of maleic anhydride and methylmethacrylate/maleic anhydride and vinyl benzyl chloride, and subsequent functionalization with 2,4 dinitroaniline. Thin films have been prepared by Matrix Assisted Pulsed Laser Evaporation (MAPLE) and UV-VIS, FTIR, Raman and Photoluminescence Spectroscopy have been used to comparatively investigate the properties of the synthesised compounds. We have evidenced the second harmonic emission (SHG), process sustained by the asymmetry of the chemical structure, which is correlated with the crystallization in non-centrosymmeric structures.

Maleic anhydride

Surface Modification

10.1080/00150190902993291

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Citations (21)

Synthesis and characterization of some polymers with applications in non-linear optics II. Copolymerization of styrene with some monomers containing azo-dyes

European Polymer Journal (1999)

Ana‐Maria Albu Bogdan Mărculescu Dan Sorin Vasilescu

Chromophore

Reactivity

Characterization

10.1016/s0014-3057(99)00019-1

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Citations (14)

Polymer Architectures for Optical and Photonic Applications

IntechOpen eBooks (2021)

Ana‐Maria Albu Vlad Marian Târpă

The last decade of the last century is marked by a revolution in the synthesis of materials for optical and photonic applications, against the background of the growing need for new high-performance materials to increase the efficiency, reliability and speed of response linked to environmental aspects. The diversity of requirements and the optimization of the responses has led to a major dispute over the structure and composition of these materials: Inorganic or Organic, Natural or Synthetic, Hybrid or Pure, which has stimulated interest in the development of various architectures. Special attention shall be paid to establishing a fundamental relationship to correlate the non-linear optical response and chemical structure, especially for the category of organic materials- particularly polymers- distinguished by structural/compositional versatility and suitable for processing by simple technique which allows serial production. In fact, optical nonlinearity (NLO) is not an exotic phenomenon. Indeed, all materials are optically nonlinear if light is sufficiently intense. The synthesis of functional photonic organic materials is a major challenge of contemporary community of material scientists to imagine new functional materials based of “collective” phenomena by virtue of the “engineered” molecule- molecule interactions and spatial relationships. In this context, this paper aims to highlight the most important features concerning the structural - compositional relationship of polymeric materials used in optoelectronic and photonic applications.

Photonic metamaterial

Optical materials

10.5772/intechopen.99695

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Citations (0)

Modification de celluloses par polymérisation in situ

HAL (Le Centre pour la Communication Scientifique Directe) (2007)

Doriana Stanciu Adrian Florin Nicolescu Valentin Victor Jerca Ana‐Maria Albu Dumitru Mircea Vuluga

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New trends in architecture of azo-polymer materials with applications in optical field

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2009)

Ana‐Maria Albu Ileana Rău Dumitru Mircea Vuluga Dan Sorin Vasilescu

In the large family of polymers, the azobenzene derivatives represent one fascinating materials class, along with stylbene and azomethinic derivatives. This interest is explained by combination of the properties of anisotropy with the photoinduced behaviors. The photoinduced birefringence, relief grating, the high optical nonlinearity resulted from the sin-anti isomerism, molecular reorientation, the exceptional stability to writing and erasing by laser radiation, are just the most important arguments for their usage of these polymeric architectures in the NLO field as: LCD, chemical sensing, devices for storage and transmission of information . This presentation covers the development and characterization a new series of materials from viewpoint of: -Modification of the polymer materials by the chemical transformation of the "common" polymer support an underlining: photorefractivity, NLO properties -Utilization of these polymers as components in guest-host materials preparation.

Azobenzene

Characterization

10.1117/12.832026

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Citations (0)

Synthesis, characterization and nonlinear optical properties study of polymers based on coloured monomers

Polymer (2000)

M. Sylla Doina Mănăila-Maximean Ana‐Maria Albu Jean‐Jacques Delaunay

Characterization

10.1016/s0032-3861(99)00610-2

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Citations (12)

Synthesis and Characterization of New Carbazole Derivative for Photorefractive Materials

Ionica Ioniţă Ana‐Maria Albu Cristiana Rădulescu Costin D. Nenitescu

The aim of the present study was to synthesize and characterize the new derivative with carbazole, such as (N,N-dimethyl-4-phenyl)-[3-[N-(2-hydroxyethyl)carbazolyl]]diazene (CzEtAzDMe) which can be used with success for the obtaining the new photorefractive materials. The synthesis of this compound : carbazole derivative was achieved by diazotization of 4-amino-N,N-dimethylaniline with NaNO 2 and H 2 SO 4 and coupling the obtained diazonium salt with N-(2-hydroxyethyl)-carbazole. In order to establish the chemical structure of the new compound, the organic intermediate as well as CzEtAzDMe was purified by HPTLC. The purified compounds were characterized by spectral analysis (FTIR, UV-Vis) and Differential Scanning Calorimetry (DSC). Quartz crystal microbalances (QCM) technique was used in order to monitor the physical properties associated to the surface and interfacial processes of synthesized carbazole derivative.

Carbazole

Derivative (finance)

Quartz Crystal Microbalance

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Citations (2)

Copolymerization of the pair maleic anhydride–dicyclopentadiene: I. Copolymerization and post‐copolymerization at high conversion

Polymer International (2004)

Edina Rusen Bogdan Mărculescu Ana‐Maria Albu Dumitru Mircea Vuluga Adrian Boborodea

Abstract The present study describes the kinetic investigation of the complex binary copolymerization system maleic anhydride (MA)—dicyclopentadiene (DCPD). All syntheses were carried out in homogeneous solution; high conversions in soluble and linear copolymer are achievable when starting from an equimolecular monomer feed. Excess of DCPD would limit the attainable conversions, while surplus of MA would induce crosslinking of the copolymers. The findings of the thorough kinetic study were sustained by structural assessment from IR and NMR spectra recorded for various copolymers, both soluble and gels. Copyright © 2004 Society of Chemical Industry

Dicyclopentadiene

Maleic anhydride

10.1002/pi.1689

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Citations (7)