Spelling suggestions: "subject:"energytransfer"" "subject:"energietransfer""
51 |
Dynamical control of irregular intensity fluctuations in a chaotic multimode solid state laser systemGills, Zelda Y. 08 1900 (has links)
No description available.
|
52 |
The creation and charaterization of chemically created atomic population inversions for the development of a visible chemical laserShen, Knag-Kang 08 1900 (has links)
No description available.
|
53 |
ENERGY TRANSFER BETWEEN MOLECULES IN THE VICINITY OF METAL NANOPARTICLEBOBBARA, SANYASI RAO 05 July 2011 (has links)
Nanoplasmonics has opened up the gates for numerous innovations. Recent studies
showed that metal nanoparticles, when introduced into the solar cells and organic
light emitting diodes, would greatly enhance their efficiencies. Though these advances
are promising, they require a tool for investigating the interactions occuring at the
microscopic level to further optimize their performance. In that context, we are
interested in understanding the energy transfer mechanism between molecules in the
vicinity of metal nanoparticle. Time-resolved
fluorescence intensity and anisotropy
experiments on single and clusters of Silver-Silica core-shell nanoparticles coated with
Rhodamine B(RB) dye molecules, (Ag-SiO2-RB) were performed. We witnessed the
signature of the interaction between RB molecules and metal nanoclusters in the form
of the enhanced
fluorescence intensity decay rates. The
fluorescence lifetime of RB in
the vicinity of the nanoparticles was (600 +/- 100) ps, as compared to (2.4+/-0.3)ns in
the absence of nanoparticle. While the anisotropy of RB molecules in the absence of
nanoparticle has remained almost constant(0.075+/-0.029) over long times; anisotropy
in the presence of particles showed wide range of values immediately after excitation.
Surprisingly high anisotropy values, at about 10 ns after excitation, were observed
with a mean of about (0.145+/-0.025). We interpret the high and low initial anisotropies
of the clusters, relative to the case of RB alone, to be due to the interaction of dye molecules with collective plasmon modes of the clusters. / Thesis (Master, Physics, Engineering Physics and Astronomy) -- Queen's University, 2011-06-30 23:29:38.658
|
54 |
Applications of Optical Spectroscopy in Studies on Energy and Electron Transfer and Solvation Effects in Nanoscale and Molecular SystemsOh, Megan 13 January 2014 (has links)
This thesis describes three investigations, ranging in subject matters, all of which relating to systems capable of photoinduced reactions involving energy or electron transfer. The phenomenon and the effects of environment in the various systems are explored using different methodologies of optical spectroscopy. As the chapters progress, different investigations introduce and build on fundamental concepts encountered and in complexity of the methodologies used to explore the systems.
The first chapter introduces the preparation of water-soluble CdSe nanocrystal clusters. The clusters, created using a protein, are 3-D close-packed self-assemblies of nanocrystals. Due to this close-packed nature, electronic interactions between the nanocrystals allow for energy migration within the cluster. The structural and optical properties of the clusters were described. Then using steady-state spectroscopy, properties of the original nanocrystals were compared to that of the cluster to determine the consequence of nanocrystal coupling interactions and their potential use toward the development of artificial light-harvesting systems.
In the second chapter, CdSe nanocrystals are functionalized with a unique electro-active polymer, and the electron transfer between the nanocrystal and the electro-active polymer adsorbate is investigated. Using fluorescence decay measurements, the electron transfer reaction inherent to the system with respect to a comprehensive range of dielectric solvents was explored. The study illustrates the high complexity of seemingly typical nanocrystal-based systems and provides general awareness of what factors need to be considered when dealing with such systems.
The final chapter starts with an informal review of ultrafast nonlinear spectroscopy, focusing on two methods, three-pulse photon echo peak shift (3PEPS) and two-dimensional photon echo (2DPE) electronic spectroscopy, and how they are related. A straightforward approach for extracting 3PEPS data from 2DPE results is presented in a preliminary case study of a dye in two different solvents, one of which is electron-donating.
|
55 |
Applications of Optical Spectroscopy in Studies on Energy and Electron Transfer and Solvation Effects in Nanoscale and Molecular SystemsOh, Megan 13 January 2014 (has links)
This thesis describes three investigations, ranging in subject matters, all of which relating to systems capable of photoinduced reactions involving energy or electron transfer. The phenomenon and the effects of environment in the various systems are explored using different methodologies of optical spectroscopy. As the chapters progress, different investigations introduce and build on fundamental concepts encountered and in complexity of the methodologies used to explore the systems.
The first chapter introduces the preparation of water-soluble CdSe nanocrystal clusters. The clusters, created using a protein, are 3-D close-packed self-assemblies of nanocrystals. Due to this close-packed nature, electronic interactions between the nanocrystals allow for energy migration within the cluster. The structural and optical properties of the clusters were described. Then using steady-state spectroscopy, properties of the original nanocrystals were compared to that of the cluster to determine the consequence of nanocrystal coupling interactions and their potential use toward the development of artificial light-harvesting systems.
In the second chapter, CdSe nanocrystals are functionalized with a unique electro-active polymer, and the electron transfer between the nanocrystal and the electro-active polymer adsorbate is investigated. Using fluorescence decay measurements, the electron transfer reaction inherent to the system with respect to a comprehensive range of dielectric solvents was explored. The study illustrates the high complexity of seemingly typical nanocrystal-based systems and provides general awareness of what factors need to be considered when dealing with such systems.
The final chapter starts with an informal review of ultrafast nonlinear spectroscopy, focusing on two methods, three-pulse photon echo peak shift (3PEPS) and two-dimensional photon echo (2DPE) electronic spectroscopy, and how they are related. A straightforward approach for extracting 3PEPS data from 2DPE results is presented in a preliminary case study of a dye in two different solvents, one of which is electron-donating.
|
56 |
Label-free Target Nucleic Acid Detection using a Quantum Dot-FRET based Displacement AssayKamaluddin, Sara 20 November 2012 (has links)
The exploration of a quantum dot fluorescence resonance energy transfer (QD-FRET) based bioassay for label-free target nucleic acid detection is reported herein. This work explores the potential for developing a displacement assay for detection of nucleic acid sequences of various lengths, including one of 484 bases. Short probe oligonucleotides conjugated to QDs were allowed to hybridize to short partially mismatched dye-labelled oligonucleotide targets. The non-labelled target of interest, a 484-base segment of heat shock protein 70 (HSP 70), contained a portion that was fully complementary to the probe. Thermodynamic parameters suggested that HSP 70 would displace dye-labelled targets; however, detection was not observed. Modifications were made to this assay to reduce sterics and increase the stability of hybrids. The results obtained using this modified assay indicated that detection of non-labelled, long oligonucleotide sequences was possible using a displacement assay that relied on a short probe oligonucleotide.
|
57 |
Label-free Target Nucleic Acid Detection using a Quantum Dot-FRET based Displacement AssayKamaluddin, Sara 20 November 2012 (has links)
The exploration of a quantum dot fluorescence resonance energy transfer (QD-FRET) based bioassay for label-free target nucleic acid detection is reported herein. This work explores the potential for developing a displacement assay for detection of nucleic acid sequences of various lengths, including one of 484 bases. Short probe oligonucleotides conjugated to QDs were allowed to hybridize to short partially mismatched dye-labelled oligonucleotide targets. The non-labelled target of interest, a 484-base segment of heat shock protein 70 (HSP 70), contained a portion that was fully complementary to the probe. Thermodynamic parameters suggested that HSP 70 would displace dye-labelled targets; however, detection was not observed. Modifications were made to this assay to reduce sterics and increase the stability of hybrids. The results obtained using this modified assay indicated that detection of non-labelled, long oligonucleotide sequences was possible using a displacement assay that relied on a short probe oligonucleotide.
|
58 |
Experimental and computational study of vibrational energy transfer in nitric oxideWhite, Allen Ray, January 2007 (has links)
Thesis (Ph. D.)--Ohio State University, 2007. / Title from first page of PDF file. Includes bibliographical references (p. 192-196).
|
59 |
Development of a fluorescence resonance energy transfer optical nanoscale biosensor based on a liquid-core waveguide platformStringer, R. Cody. January 2007 (has links)
Thesis (M.S.)--University of Missouri-Columbia, 2007. / The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on September 30, 2008) Includes bibliographical references.
|
60 |
Luminescence resonance energy transfer-based modeling of troponin in the presence of myosin and troponin/tropomyosin defining myosin binding target zones in the reconstituted thin filamentPatel, Dipesh A. Root, Douglas, January 2009 (has links)
Thesis (Ph. D.)--University of North Texas, May, 2009. / Title from title page display. Includes bibliographical references.
|
Page generated in 0.0409 seconds