BrainMap

Mr. Cezar Comanescu

Dr.

- INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Researcher

Web of Science ResearcherID: not public

Expertise & keywords

Compensated ferrimagnetic oxides for rapid magnetic switchers Call name: P 2 - SP 2.1 - Proiect experimental - demonstrativ
PN-III-P2-2.1-PED-2021-2007 2022 - 2024

Role in this project:

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation:

Project website: https://infim.ro/en/project/compensated-ferrimagnetic-oxides-for-rapid-magnetic-switchers-femagswit/

Abstract:

Electric-field control of magnetism has remained a major challenge which would greatly impact especially data storage technology, but also other types of logic and electromagnetically controlled devices. Control of magnetic properties by an electric field would enable new data storage technologies operating at low electrical power. Although the electric field could be used to manipulate a wide range of magnetic properties, e.g. Curie temperature, magnetic moment, coercivity, and magnetic anisotropy, the realization of 180° magnetization switching could only be realized in few systems. The scope of this project is to obtain and validate an advanced material, namely a rare earth garnet of RE3Fe5O12 type (RIG), with RE=Tb, Gd, Dy and Ho for future generations of electronic devices. The project’s general objective is to select a material (demonstration model) with suitable magnetic properties for high performance spintronic applications, namely a magnetic switching device. The proposed material will be obtained by our original technological route that combines a cheap and facile surfactant assisted hydrothermal method to prepare mesoporous RE3Fe5O12 structures followed by Spark Plasma Sintering (SPS) and post-annealing to consolidate the obtained nanoparticle powders into high-density nano structured bulks with controlled and refined properties. The challenge of this project is to select a material in which we could achieve a fast and robust switching of magnetization under low current excitation near room temperature. For comparison, materials obtained by the classical method (solid state reaction) will also be assessed.

Elimination of Antidepressant Drugs from Wastewaters by Microemulsion-Assisted Extraction Coupled with Photodegradation Call name: P 1 - SP 1.1 - Proiecte de cercetare pentru stimularea tinerelor echipe independente - TE-2021
PN-III-P1-1.1-TE-2021-1216 2022 - 2024

Role in this project:

Coordinating institution: UNIVERSITATEA POLITEHNICA DIN BUCURESTI

Project partners: UNIVERSITATEA NAŢIONALĂ DE ŞTIINŢĂ ŞI TEHNOLOGIE POLITEHNICA BUCUREŞTI (RO)

Affiliation:

Project website: https://sites.google.com/view/antidepelim

Abstract:

Tricyclic antidepressants (TCAs) are a class of pharmaceuticals showing a current boom in consumption worldwide, but whose environmental occurrence and toxicology just began to be investigated with the advent of analytical methods able to detect their low levels (down to ppb) in the environment. Significant advances in water treatment systems effective at eliminating TCAs still need to be demonstrated to remediate contamination of waters by such contaminants of emerging concern (CECs).

This project will provide a strong fundamental background on an innovative integrated nanotechnology, namely microemulsion-assisted extraction coupled with photodegradation, based on self-assembled nanofluids, aiming to achieve separation and destruction of five representative TCAs from wastewater treatment plant (WWTP) effluents. For quantitative assessment of TCA removal efficiency, of photodegradation kinetics, and identification of photo-pathway intermediates and products, a spectroscopy and chromatography-based approach will be undertaken. For wastewater remediation, this project will provide a new application of microemulsions as extraction systems for the selected 5 model CECs in WWTP effluents and a novel tool – a “nano-reactor” for their photodegradation, to operate here at lab scale and perhaps in actual WWTPs in the future. In line with TE2021 call objectives, another goal of this project is to build around the Principal Investigator a competitive team of talented young researchers.

Nanoconfinement for Energy Storage in Metal Organic Frameworks Call name: P 1 - SP 1.1 - Proiecte de cercetare pentru stimularea tinerelor echipe independente - TE-2021
PN-III-P1-1.1-TE-2021-1657 2022 - 2024

Role in this project: Project coordinator

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation:

Project website: https://infim.ro/en/project/nanoconfinement-for-energy-storage-in-metal-organic-frameworks/

Abstract:

The aim of this project is to synthesize new amine-substituted, mesoporous MOF-NH2 (MOF: metal organic framework), with tunable pore sizes, as supports for complex metal borohydrides (M(BH4)2, M=Mg, Ca, Zn), leading to new nanocomposite materials of general formula M(BH4)x@MOF-NH2. Organic ligand synthesis (dicarboxylic organic blocks) employ a Sonogashira coupling reaction, and by solvothermal reaction with a Ni2+, Zn2+ or Cu2+ salt solution lead to MOF-NH2 construction. Additional treatment with Pd2+ salts will decorate MOF-NH2 with Pd-catalyst, useful for hydrogen storage studies. A salt metathesis reaction will afford M(BH4)2 precursors. Boron-atom economy, the key point in reversibility of hydrogen in metal borohydrides, is addressed by -NH2 grafting in MOF-NH2, which will bind active BH3 molecules in ammonia-borane fashion (MOF-NH2.BH3), yielding secondary hydrogen storage sites (FLP). Borohydride nanoconfinement in MOF pores will alter the kinetics and thermodynamics of hydrogen storage. It is expected that hydrogen release will be fast below 100 °C, and rehydrogenation to be enhanced. A complex, combined investigation study of as-synthesized nanocomposites will be done by XRD, FTIR, N2 sorption isotherms, DTA-DTG, SEM, TEM, EDAX and ICP-MS. The maximum hydrogen storage capacity of such catalyzed composites M(BH4)x@MOF-NH2 will be assessed in a Sievert-type volumetric apparatus, and is expected to be close or meet DOE standards of 4.5 wt% H2,while behaving reversibly.

Complex experimental and theoretical approaches in the evaluation of magnetic hyperthermia application. Call name: P 1 - SP 1.1 - Proiecte de cercetare pentru stimularea tinerelor echipe independente - TE-2021
PN-III-P1-1.1-TE-2021-1300 2022 - 2024

Role in this project: Key expert

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation:

Project website: https://infim.ro/project/studii-experimentale-si-teoretice-complexe-pentru-aplicatii-de-hipertermia-magnetica/

Abstract:

The project scope is to develop new experimental approaches for the evaluation of the most important parameters which influence the magnetic hyperthermia(MH), to provide original procedures/methodologies for the evaluation of the Specific Absorption Rate (SAR). New magnetic single-domain iron oxide-based nanoparticles for biomedical applications will be designed and in vitro MH assays will be approached. By using specific preparation procedures, suitable and functionalization of mono-dispersed spherical, cubic or acicular shaped nanoparticles, for tailoring their effective anisotropy constant will be synthesized. It is envisaged: (i) the systematic evaluation of the most important parameters of interest in hyperthermia, (ii) the evaluation of the relationships between the magnetic and morpho-structural parameters with impact on SAR and the determination of SAR in correlation to realistic volume fraction of nanoparticles dispersed in a media compatible with the human tissue, (iii) the development of original SAR evaluation procedures by accounting for the heat loses , (iv) the consideration the spatial distribution of the magnetic field and nanoparticle concentration as input data for the discrete estimation of the dissipated power and further inputs in the bio-heat transfer equation, (v) the optimization of the RF magnetic field exposures on the NP systems, in correlation to morpho-structural characteristics and volume fractions specific to MH applications.

Combined Experimental and Computational Framework for the Hydrogen Storage on Magnesium-based Nanoparticles Call name: P 2 - SP 2.1 - Proiect experimental - demonstrativ
PN-III-P2-2.1-PED-2019-4816 2020 - 2022

Role in this project: Key expert

Coordinating institution: INSTITUTUL DE CHIMIE FIZICA - ILIE MURGULESCU

Project partners: INSTITUTUL DE CHIMIE FIZICA - ILIE MURGULESCU (RO); INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://www.icf.ro/pr_2019/CEAF-HySTO/index.html

Abstract:

Molecular simulations can help us to understand the microscopic origins of the investigated properties and phenomena and to orient the experiment design and the materials synthesis. Unfortunately, the electronic structure methods are computationally expensive and there not yet developed accurate empirical force fields (EFF) for magnesium hydride nanosystems.

The main goal of the present proposal of project is to attain a research framework for the understanding of the hydrogen interaction with Mg-based bulk and nano-systems and of the formation and decomposition of MgH2, which is seen as the main solution for hydrogen storage. The main objectives of the project are:

(i) the parameterization of an accurate EFF of type ADP (Angular Dependent Potential) for the hydrogen-magnesium interaction, which has to be transferable from bulk (liquid, polymorphs) Mg and MgH2 to their surfaces, interfaces and nanosystems. The ADP force field has to be able to predict the shapes of the MgHx nanoparticles (with a different contents x of hydrogen) that will be identified by the experimental investigations, for different particle-sizes. The Wulff techniques will be used to construct the nanoparticles, based on the surface energies of the most faces of the Mg and MgH2 polymorphs, calculated by DFT and ADP methods,

(ii) the design of proper analysis methods for the characterization of structural, dynamic, vibration properties of the nanoparticles with different degrees of hydrogenation, as well as the hydrogen (de)sorption and diffusion into the magnesium nanoparticle during the Molecular Dynamics simulations of hydride formation and decomposition,

(iii) the including of the analysis software as an user module in the simulation code LAMMPS, which is one of most performing simulation software, designed for High Performance Computing.

(iv) the use of the parameterized force field in the frame of the project for guiding the synthesis of the pristine and confined Mg-based nano-hydrides.

NEW METHODS OF DIAGNOSIS AND TREATMENT: CURRENT CHALLENGES AND TECHNOLOGIC SOLUTIONS BASED ON NANOMATERIALS AND BIOMATERIALS Call name: P 1 - SP 1.2 - Proiecte complexe realizate in consorții CDI
PN-III-P1-1.2-PCCDI-2017-0062 2018 - 2021

Role in this project: Key expert

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE IN DOMENIUL PATOLOGIEI SI STIINTELOR BIOMEDICALE "VICTOR BABES" (RO); UNIVERSITATEA DE MEDICINA SI FARMACIE "CAROL DAVILA" (RO); UNIVERSITATEA DE MEDICINA SI FARMACIE "GRIGORE T. POPA" DIN IAŞI (RO); INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE CHIMICO - FARMACEUTICA - I.C.C.F. BUCURESTI (RO); INSTITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU TEHNOLOGII IZOTOPICE SI MOLECULARE I N C D T I M (RO); UNIVERSITATEA TRANSILVANIA BRASOV (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://infim.ro/en/project/sanomat/

Abstract:

The project will develop novel conceptual and functional solutions of biomedical devices for treatment, reinforcement/repair/replacement (of human tissues) and diagnosis based on nanostructured and/or biocompatible materials, with high attractivity and certain potential for technology transfer to industry. The experience of the interdisciplinary consortium will allow a passage from concepts of nanomaterials and biomaterials with extended and/or complementary functional features to implementation to new biomedical applications of great interest: (i) antitumoral therapeutic systems (by localized magnetic hyperthermia, photodynamic therapy and drug delivery); (ii) biocompatible compounds with enhanced antimicrobial efficacy; (iii) stent or vein/arterial filters implants based on ferromagnetic shape-memory alloys (with the advantage of repositioning without the need of new invasive interventions); (iv) personalized bone regenerative implants (i.e. porous ceramic scaffolds for bone tissue engineering; dental implants with rapid osseointegration); (v) (bio)sensors for monitoring the bioavailability of pharmaceutical compounds and detecting the reactive oxygen species and their biologic effect; and (vi) correlation of physico-chemical properties with clinical investigations for two types of aerosols (salt particles and essential oils), and their prospective coupling with possible synergistic effects. The synergic development of the institutional capacity of the project partners will be achieved by: creating new jobs and purchasing new equipment and software, providing technical/scientific assistance to the emerging institutions, initiating and fostering collaborations with partners from industry in view of technology transfer, and increasing the international visibility of the involved institutions by capitalizing on the obtained research results. The project will create the core of the first national cluster in the field of healthcare technologies.

New advanced nanocomposites. Technological developments and applications Call name: P 1 - SP 1.2 - Proiecte complexe realizate in consorții CDI
PN-III-P1-1.2-PCCDI-2017-0871 2018 - 2021

Role in this project: Key expert

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU OPTOELECTRONICA INOE 2000 INCD (RO); UNIVERSITATEA DE VEST TIMISOARA (RO); ACADEMIA ROMANA FILIALA TIMISOARA (RO); UNIVERSITATEA BABES BOLYAI (RO); INSTITUTUL NATIONAL DE CERCETARE-DEZVOLTARE PENTRU FIZICA TEHNICA-IFT IASI (RO); INSTITUTUL NATIONAL DE CERCETARE DEZVOLTARE PENTRU FIZICA LASERILOR, PLASMEI SI RADIATIEI - INFLPR RA (RO); INSTITUTUL NATIONAL DE CERCETARE- DEZVOLTARE PENTRU MICROTEHNOLOGIE - IMT BUCURESTI INCD (RO); UNIVERSITATEA "DUNAREA DE JOS" (RO); UNIVERSITATEA TRANSILVANIA BRASOV (RO); Ministerul Apararii Nationale prin Centrul de Cercetare Stiintifica pentru Aparare CBRN si Ecologie (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://infim.ro/project/kuncser_noi_directii_de_dezvoltare_tehnologica_si_utilizare_nanocompozite_avansate_47pccdi_2018

Abstract:

The development of complex nanocomposite materials consisting of different matrices (polymer-like, oxides, intermetallics, liquids) functionalized by different nasnostructured additions (carbon allotropes, magnetic nanoparticles with different organizations, nanostructured semiconductors, etc.) is the aim of this project. The unique combinations of interacting nanophases offeres to the hybrid nanocomposite material new or enhanced proprieties of high interest for applications. In this context, according to the previous experience of the involved teams, the complex project (formed by 4 component projects) is focused on the development of new optimized nanocomposite systems to be included in experimental demonstrators or final products to be transferred to economical companies. The project will contribute both to an increased scientific visibility of the partners as well as to enhancing the institutional performances by the development of new technical and scientific capacities.

High energy efficient permanent magnets without rare-earth elements Call name: Joint Applied Research Projects - PCCA 2013 - call
PN-II-PT-PCCA-2013-4-0971 2014 - 2017

Role in this project: Key expert

Coordinating institution: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA

Project partners: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO); UNIVERSITATEA BABES BOLYAI (RO); PurTech SRL (RO)

Affiliation: INSTITUTUL NATIONAL DE CERCETARE - DEZVOLTARE PENTRU FIZICA MATERIALELOR BUCURESTI RA (RO)

Project website: http://www.infim.ro/projects/high-energy-efficient-permanent-magnets-without-rare-earth-elements

Abstract:

This project aims at producing, characterizing and optimizing the magnetic properties of a new class of permanent magnets with high energy efficiency based on iron nitride Fe16N2 with martensite structure. Theoretical predictions for this permanent magnet indicate a maximum energy product (BH)max of up to twice the theoretically maximum allowed for the highest performance magnet up to date, namely Nd2Fe14B. The project addresses a theme that became an imperative of global research and development activities taking into account the tremendous increase of the price of rare earths. It follows a multi-disciplinary approach to the problem. Theoretical calculations based on density functional theory are used for choosing optimal doping elements (transition metals and non-metals) of Fe16N2 which show a favourable effect on increasing thermodynamic stability and also in magnetic properties improvement, i.e. increase of magnetization (via population of sublattices presenting ferrimagnetic configuration) and anisotropy. Simulations of the Fe16N2 magnetic particles embedded in matrices will allow us directing preparation methods in order to obtain magnetic particle size and morphology suitable for enhanced coercivity and high remanence magnetization. Several preparation routes will converge on the obtaining of the compound Fe16N2 and other similar. A first route of preparation uses wet chemical methods that allow obtaining Fe16N2 doped particles. Firstly, it will be obtained the iron oxide or iron oxy-hydroxide precursor with controlled morphology and size using different chemical methods in solution. Subsequently, by thermal treatments of the iron oxide or oxy-hydroxide precursors in hydrogen and ammonia atmosphere one gets Fe16N2 fine magnetic particles with needle-like or ellipsoidal shape that show an important shape anisotropy and high coercivity. The second procedure is to obtain nanocomposites based on Fe16N2 by ball milling the iron powders and doping elements under hydrogen and nitrogen/ammonia reactive atmosphere. Processing of the milled composites and Fe16N2 magnetic particles doped with transition metals and non-metals will be performed using a glove box with controlled atmosphere in order to avoid the exposure to oxygen and moisture from air. Procedures for mixing with binder, orientation in applied magnetic field, pressing and sintering for long time at temperatures below 200 0C will allow to obtain anisotropic permanent magnets based on Fe16N2 with high coercivity and remanence magnetization. The energy product of this magnet will be higher than that of cheap magnets that do not contain rare earth. The magnetic particles and final sintered magnets will by characterized by X-Ray diffraction, neutron diffraction, electron microscopy. Iron-containing phases will be analyzed by Mossbauer spectroscopy. A complex characterization of the magnetic properties (hysteresis, saturation and remanence magnetization, coercivity) will be performed. Optimization of the magnetic properties will assume a permanent feedback between preparation methods – structural / compositional characterization – magnetic properties. The magnets will be coated against corrosion. The new innovative technologies used to produce these magnets will be the subject of patent application. The main outcome of the project, after performing the project activities, will be the permanent magnet without rare earth, which has higher energy product than cheap commercial magnets. A part of the results, which are not subject to patenting, will be disseminated through ISI publications and communications at international conferences.

FILE DESCRIPTION	DOCUMENT
List of research grants as project coordinator or partner team leader
Significant R&D projects for enterprises, as project manager
R&D activities in enterprises
Peer-review activity for international programs/projects