{"id":{"repo_id":"lsu-thes","oai_identifier":"oai:repository.lsu.edu:gradschool_dissertations-1327"},"canonical_url":"https://search.dev.ndltd.org/etd/lsu-thes/oai:repository.lsu.edu:gradschool_dissertations-1327","repository":{"repo_id":"lsu-thes","name":"Lousiana State University","base_url":"https://repository.lsu.edu/do/oai/"},"display":{"title":"Diffusion of a rodlike virus in complex solutions","abstract":"Entanglement phenomena in concentrated polymer solutions remain an interesting and challenging problem. It is still unclear how entanglement onset affects polymer chain motion at small distance scales. One way to study such motion is to follow the diffusion of a probe particle while increasing the concentration of the polymer. Many such studies have been done using probes ranging from linear and star polymers to various colloidal particles; however, relatively few studies have used rodlike probes. Rodlike probes are potentially more interesting due to the added information that may be gained by following rotational as well as translational diffusion. The anisotropic diffusion may allow the probe to sense something different as chains begin to entangle. The situation is unclear even for the simpler polymeric structures such as rigid rods. Due to lack of experimental data, the nature of interactions of rigid rods in concentrated solutions remains uncertain. Given the vast theoretical descriptions available, the current challenge is to find suitable rigid model particles. To date, self diffusion data for truly rigid rods is limited to only one system, colloidal boehmite, which was quite polydisperse. Described here is the use of depolarized dynamic light scattering to measure the rotational and translational diffusion of the rodlike virus, Tobacco Mosaic Virus (TMV), through solutions of random coil and globular polysaccharides, taken separately. The polymers are effectively invisible in the depolarized scattering experiment allowing only the TMV probe to be seen. Also described is the use of fluorescence photobleaching recovery to measure the self-diffusion of TMV as a function of concentration in the isotropic regime.","abstract_html":"Entanglement phenomena in concentrated polymer solutions remain an interesting and challenging problem. It is still unclear how entanglement onset affects polymer chain motion at small distance scales. One way to study such motion is to follow the diffusion of a probe particle while increasing the concentration of the polymer. Many such studies have been done using probes ranging from linear and star polymers to various colloidal particles; however, relatively few studies have used rodlike probes. Rodlike probes are potentially more interesting due to the added information that may be gained by following rotational as well as translational diffusion. The anisotropic diffusion may allow the probe to sense something different as chains begin to entangle. The situation is unclear even for the simpler polymeric structures such as rigid rods. Due to lack of experimental data, the nature of interactions of rigid rods in concentrated solutions remains uncertain. Given the vast theoretical descriptions available, the current challenge is to find suitable rigid model particles. To date, self diffusion data for truly rigid rods is limited to only one system, colloidal boehmite, which was quite polydisperse. Described here is the use of depolarized dynamic light scattering to measure the rotational and translational diffusion of the rodlike virus, Tobacco Mosaic Virus (TMV), through solutions of random coil and globular polysaccharides, taken separately. The polymers are effectively invisible in the depolarized scattering experiment allowing only the TMV probe to be seen. Also described is the use of fluorescence photobleaching recovery to measure the self-diffusion of TMV as a function of concentration in the isotropic regime.","abstract_has_math":false,"creators":["Cush, Randall Charles"],"institution":"Chemistry","degree_name":"Doctor of Philosophy (PhD)","degree_level":"Dissertation","degree_discipline":"Chemistry","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2003,"date_issued":"2003-01-01T08:00:00Z","date_published":"2003-01-01T08:00:00Z","updated_at":"2026-07-24T02:57:30Z","subjects":["depolarized dynamic light scattering","tobacco mosaic virus","tmv"],"languages":[],"rights":["unrestricted","Release the entire work immediately for access worldwide."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["etd-0409103-165104","https://repository.lsu.edu/gradschool_dissertations/328"],"render_values":[{"text":"etd-0409103-165104","href":null,"code":true},{"text":"https://repository.lsu.edu/gradschool_dissertations/328","href":"https://repository.lsu.edu/gradschool_dissertations/328","code":true}]}]},"links":{"outbound_url":"https://doi.org/10.31390/gradschool_dissertations.328","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Cush, Randall Charles"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2002-05-18"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2022-05-12T23:08:27Z"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemistry"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Doctor of Philosophy (PhD)"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Chemistry"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["depolarized dynamic light scattering","tobacco mosaic virus","tmv"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:rights","label":"Dc Rights","values":["unrestricted","Release the entire work immediately for access worldwide."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["etd-0409103-165104","10.31390/gradschool_dissertations.328","https://repository.lsu.edu/gradschool_dissertations/328"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Entanglement phenomena in concentrated polymer solutions remain an interesting and challenging problem. It is still unclear how entanglement onset affects polymer chain motion at small distance scales. One way to study such motion is to follow the diffusion of a probe particle while increasing the concentration of the polymer. Many such studies have been done using probes ranging from linear and star polymers to various colloidal particles; however, relatively few studies have used rodlike probes. Rodlike probes are potentially more interesting due to the added information that may be gained by following rotational as well as translational diffusion. The anisotropic diffusion may allow the probe to sense something different as chains begin to entangle. The situation is unclear even for the simpler polymeric structures such as rigid rods. Due to lack of experimental data, the nature of interactions of rigid rods in concentrated solutions remains uncertain. Given the vast theoretical descriptions available, the current challenge is to find suitable rigid model particles. To date, self diffusion data for truly rigid rods is limited to only one system, colloidal boehmite, which was quite polydisperse. Described here is the use of depolarized dynamic light scattering to measure the rotational and translational diffusion of the rodlike virus, Tobacco Mosaic Virus (TMV), through solutions of random coil and globular polysaccharides, taken separately. The polymers are effectively invisible in the depolarized scattering experiment allowing only the TMV probe to be seen. Also described is the use of fluorescence photobleaching recovery to measure the self-diffusion of TMV as a function of concentration in the isotropic regime."]},{"key":"dc:title","label":"Title","values":["Diffusion of a rodlike virus in complex solutions"]}]}],"canonical_facts":{"dc:creator":["Cush, Randall Charles"],"dc:date":["2002-05-18"],"dc:date.available":["2022-05-12T23:08:27Z"],"dc:description.abstract":["Entanglement phenomena in concentrated polymer solutions remain an interesting and challenging problem. It is still unclear how entanglement onset affects polymer chain motion at small distance scales. One way to study such motion is to follow the diffusion of a probe particle while increasing the concentration of the polymer. Many such studies have been done using probes ranging from linear and star polymers to various colloidal particles; however, relatively few studies have used rodlike probes. Rodlike probes are potentially more interesting due to the added information that may be gained by following rotational as well as translational diffusion. The anisotropic diffusion may allow the probe to sense something different as chains begin to entangle. The situation is unclear even for the simpler polymeric structures such as rigid rods. Due to lack of experimental data, the nature of interactions of rigid rods in concentrated solutions remains uncertain. Given the vast theoretical descriptions available, the current challenge is to find suitable rigid model particles. To date, self diffusion data for truly rigid rods is limited to only one system, colloidal boehmite, which was quite polydisperse. Described here is the use of depolarized dynamic light scattering to measure the rotational and translational diffusion of the rodlike virus, Tobacco Mosaic Virus (TMV), through solutions of random coil and globular polysaccharides, taken separately. The polymers are effectively invisible in the depolarized scattering experiment allowing only the TMV probe to be seen. Also described is the use of fluorescence photobleaching recovery to measure the self-diffusion of TMV as a function of concentration in the isotropic regime."],"dc:identifier":["etd-0409103-165104","10.31390/gradschool_dissertations.328","https://repository.lsu.edu/gradschool_dissertations/328"],"dc:rights":["unrestricted","Release the entire work immediately for access worldwide."],"dc:subject":["depolarized dynamic light scattering","tobacco mosaic virus","tmv"],"dc:title":["Diffusion of a rodlike virus in complex solutions"],"thesis:degree_discipline":["Chemistry"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Doctor of Philosophy (PhD)"],"thesis:institution_name":["Chemistry"]},"updated_at":"2026-07-24T02:57:30Z"}