Grant: Discovery Grants Program - Individual
Concordia University
$15,430.00
Structure/property relationships of active sites in disordered (amorphous/nanodomain) materials and single crystals
EF 2011-12
Résumé
Magnetic properties of materials of significant interest in biology, medicine, and industry will be studied by multi-frequency continuous-wave (CW) and pulsed electron magnetic resonance (EMR) techniques, using paramagnetic centres as probes at active sites in these materials. The EMR technique is based on the same principle as that of MRI (Magetic resonance imaging) technique used in hospitals.
1. Multifrequency CW EMR of active sites. The CW EMR measurements will be carried out in the temperature interval -271 C to +25 C at microwave frequencies in the 9.0 to 350 GHz range. We will measure: 1A. single crystals of rare-earth silicon oxides Y2SiO5 and La2Si2O7 doped with paramagentic ions; 1B. Amorphous materials:(i) Nanodomains: a) Dilute magnetic semiconductors (DMS). These are oxide materials doped by cobalt and iron ions; b) Ceramics. (ii) Metalloproteins contining doubly ionized iron and triply ionized manganese ions, of importance in biology and medicine.
2. Pulsed EMR. Theoretical calculations will be carried out, taking into account the dipolar interaction between two nitroxide probes that depends on their distance, of signals for: 2A. 2D-ELDOR (two-dimensional electron-electron double resonance); 2B. DQC (double quantum coherence) and DEER (double electron-electron resonance).
The significances of the proposed research are: (1) The ""single-crystals"" will be developed as lasers, phosphors, and materials to be used as replacement for silicon dioxide gate dielectrics. (2) The DMS samples have the potential to be developed as (spintronic) mass storage devices in hard disks of computers. (3) Novel insights into metalloproteins of interest in biology and medicine will be acquired by developing a better understanding of the properties of exchange-coupled iron centres in these proteins. (4) The pulsed EMR simulations would be used for distance measurements in biological systems, a topic on the cutting edge of research, providing clues to blueprints in life in the human genome project.
Programme
Discovery Grants Program - Individual
Bénéficiaire
Emplacement
Quebec, Canada
Type de bénéficiaire
Academia
Type
Grant
Source
NSERC's Awards Data
Tel que publié
Application id
4485-2007
Name nom
Misra, Sushil
Department département
Physics
Organization id
70
Institution établissement
Concordia University
Province en
Québec
Province fr
Québec
Country en
CANADA
Country fr
CANADA
Fiscal year exercice financier
2011
Competition year année de concours
2007
Award amount
15430
Program id
RGPIN
Program nane en
Discovery Grants Program - Individual
Program name fr
Programme de subventions à la découverte - individuelles
Group en
Discovery grants programs
Group fr
Programmes de subventions à la découverte
Committee code
26
Committee name en
Anal. & Phys. Chemistry
Committee name fr
Chimie analytique et physique
Area of application code
1208
Area of application group en
Advancement of knowledge
Area of application group fr
Avancement des connaissances
Area of application en
Materials sciences
Area of application fr
Sciences des matériaux
Research subject code
3604
Research subject group en
Inorganic chemistry
Research subject group fr
Chimie inorganique
Research subject en
Solid state inorganic chemistry
Research subject fr
Chimie inorganique -- état solide
Partie
5
Nb partie
5
Application title
Structure/property relationships of active sites in disordered (amorphous/nanodomain) materials and single crystals
Keyword
NSERC
Application summary
Magnetic properties of materials of significant interest in biology, medicine, and industry will be studied by multi-frequency continuous-wave (CW) and pulsed electron magnetic resonance (EMR) techniques, using paramagnetic centres as probes at active sites in these materials. The EMR technique is based on the same principle as that of MRI (Magetic resonance imaging) technique used in hospitals.
1. Multifrequency CW EMR of active sites. The CW EMR measurements will be carried out in the temperature interval -271 C to +25 C at microwave frequencies in the 9.0 to 350 GHz range. We will measure: 1A. single crystals of rare-earth silicon oxides Y2SiO5 and La2Si2O7 doped with paramagentic ions; 1B. Amorphous materials:(i) Nanodomains: a) Dilute magnetic semiconductors (DMS). These are oxide materials doped by cobalt and iron ions; b) Ceramics. (ii) Metalloproteins contining doubly ionized iron and triply ionized manganese ions, of importance in biology and medicine.
2. Pulsed EMR. Theoretical calculations will be carried out, taking into account the dipolar interaction between two nitroxide probes that depends on their distance, of signals for: 2A. 2D-ELDOR (two-dimensional electron-electron double resonance); 2B. DQC (double quantum coherence) and DEER (double electron-electron resonance).
The significances of the proposed research are: (1) The ""single-crystals"" will be developed as lasers, phosphors, and materials to be used as replacement for silicon dioxide gate dielectrics. (2) The DMS samples have the potential to be developed as (spintronic) mass storage devices in hard disks of computers. (3) Novel insights into metalloproteins of interest in biology and medicine will be acquired by developing a better understanding of the properties of exchange-coupled iron centres in these proteins. (4) The pulsed EMR simulations would be used for distance measurements in biological systems, a topic on the cutting edge of research, providing clues to blueprints in life in the human genome project.
