{"id":{"repo_id":"greenwich","oai_identifier":"oai:gala.gre.ac.uk:18140"},"canonical_url":"https://search.dev.ndltd.org/etd/greenwich/oai:gala.gre.ac.uk:18140","repository":{"repo_id":"greenwich","name":"University of Greenwich","base_url":"https://gala.gre.ac.uk/cgi/oai2"},"display":{"title":"Synthesis, physico-chemical properties and potential applications of colloidal gel particles","abstract":"Four new N-isopropylacrylamide (NIPAM) based particles have been synthesized and characterized. The first experimental chapter reports that fluorescent poly(Nisopropylacrylamide-co-5% vinyl cinnamate) microgels were deposited on different solid surfaces to produce new environmental responsive surfaces. The mass of microgel particles deposited on glass pre-treated with acid, glass pre-treated with base, quartz, stainless steel, gold and Teflon at 25°C and 60°C was determined using fluorescence spectroscopy. The factors affecting the adsorption/desorption of the microgel particles were also investigated. The study shows that the solid surface charge is the most significant factor, followed by that of surface roughness and temperature; meanwhile, the hydrophobicity/hydrophilicity of the surface was the least significant. Fluorescent temperature/pH responsive p(NIPAM-co-5% acrylic acid)-rhodamine B particles were studied. The results confirm the attachment of rhodamine B to the microgel particles. The long chains attached to the particles caused the particles to be poly-dispersed which suggests non-uniformity of particle size and behavior. Fluorescent temperature/pH responsive poly(N-isopropylacrylamide-co-5% lucifer yellow) (p(NIPAM-co-5% LY)) microgel particles were tested for toxicity. The particles were negatively charged, mono-dispersed and were approximately 250 nm in diameter at 15°C. The toxicity of different concentrations of p(NIPAM-co-5% LY), p(NIPAM) and NIPAM monomer was tested on two cell lines (HeLa and Vero). The results show that the two particles maintain cell viability over 80% (for both cell lines HeLa and Vero) up to a concentration of 3 mg/mL while NIPAM monomer showed a cell viability of over 80% at a concentration equal to or less than 0.3 mg/mL. The fourth experimental chapter explores the opportunity of using microgel particles as an emulsifier. p(NIPAM-co-5% acrylic acid)-hexenol particles with both hydrophilic and hydrophobic groups in their molecular structure were used to stabilize two emulsions (tricaprylin-in-water and hexadecane-in-water). The stability of the emulsions increased with increasing the concentration of the microgel. For the tricaprylin-in-water emulsion, a concentration of 0.3% w/v of the novel microgel particles managed to stabilize the emulsion for a week. In case of the hexadecane emulsion in water, 0.45% w/v microgel particles could show an increase in the emulsion stability and a decrease in the creaming.","abstract_html":"Four new N-isopropylacrylamide (NIPAM) based particles have been synthesized and characterized. The first experimental chapter reports that fluorescent poly(Nisopropylacrylamide-co-5% vinyl cinnamate) microgels were deposited on different solid surfaces to produce new environmental responsive surfaces. The mass of microgel particles deposited on glass pre-treated with acid, glass pre-treated with base, quartz, stainless steel, gold and Teflon at 25°C and 60°C was determined using fluorescence spectroscopy. The factors affecting the adsorption/desorption of the microgel particles were also investigated. The study shows that the solid surface charge is the most significant factor, followed by that of surface roughness and temperature; meanwhile, the hydrophobicity/hydrophilicity of the surface was the least significant. Fluorescent temperature/pH responsive p(NIPAM-co-5% acrylic acid)-rhodamine B particles were studied. The results confirm the attachment of rhodamine B to the microgel particles. The long chains attached to the particles caused the particles to be poly-dispersed which suggests non-uniformity of particle size and behavior. Fluorescent temperature/pH responsive poly(N-isopropylacrylamide-co-5% lucifer yellow) (p(NIPAM-co-5% LY)) microgel particles were tested for toxicity. The particles were negatively charged, mono-dispersed and were approximately 250 nm in diameter at 15°C. The toxicity of different concentrations of p(NIPAM-co-5% LY), p(NIPAM) and NIPAM monomer was tested on two cell lines (HeLa and Vero). The results show that the two particles maintain cell viability over 80% (for both cell lines HeLa and Vero) up to a concentration of 3 mg/mL while NIPAM monomer showed a cell viability of over 80% at a concentration equal to or less than 0.3 mg/mL. The fourth experimental chapter explores the opportunity of using microgel particles as an emulsifier. p(NIPAM-co-5% acrylic acid)-hexenol particles with both hydrophilic and hydrophobic groups in their molecular structure were used to stabilize two emulsions (tricaprylin-in-water and hexadecane-in-water). The stability of the emulsions increased with increasing the concentration of the microgel. For the tricaprylin-in-water emulsion, a concentration of 0.3% w/v of the novel microgel particles managed to stabilize the emulsion for a week. In case of the hexadecane emulsion in water, 0.45% w/v microgel particles could show an increase in the emulsion stability and a decrease in the creaming.","abstract_has_math":false,"creators":["Mohsen Momee, Reham M."],"institution":"University of Greenwich","degree_name":"phd","degree_level":"doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Snowden, Martin","Alexander, Bruce"],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-03","date_published":"2015-03","updated_at":"2026-07-24T02:25:53Z","subjects":["QD Chemistry"],"languages":["en"],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":null,"outbound_label":null,"outbound_source":null},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Snowden, Martin","Alexander, Bruce"]},{"key":"dc:creator","label":"Author","values":["Mohsen Momee, Reham M."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-03"]},{"key":"dc:date.issued","label":"Date","values":["2015-03"]},{"key":"dc:publisher.department","label":"Dc Publisher Department","values":["Department of Pharmaceutical, Chemical and Environmental Sciences"]},{"key":"dc:publisher.institution","label":"Dc Publisher Institution","values":["University of Greenwich"]},{"key":"dc:relation.isreferencedby","label":"Dc Relation Isreferencedby","values":["https://gala.gre.ac.uk/id/eprint/18140/"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"dc:type.qualificationlevel","label":"Dc Type Qualificationlevel","values":["doctoral"]},{"key":"dc:type.qualificationname","label":"Dc Type Qualificationname","values":["phd"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["QD Chemistry"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://gala.gre.ac.uk/id/eprint/18140/1/Reham%20M.%20Mohsen%20Momee%202015.pdf"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Four new N-isopropylacrylamide (NIPAM) based particles have been synthesized and characterized. The first experimental chapter reports that fluorescent poly(Nisopropylacrylamide-co-5% vinyl cinnamate) microgels were deposited on different solid surfaces to produce new environmental responsive surfaces. The mass of microgel particles deposited on glass pre-treated with acid, glass pre-treated with base, quartz, stainless steel, gold and Teflon at 25°C and 60°C was determined using fluorescence spectroscopy. The factors affecting the adsorption/desorption of the microgel particles were also investigated. The study shows that the solid surface charge is the most significant factor, followed by that of surface roughness and temperature; meanwhile, the hydrophobicity/hydrophilicity of the surface was the least significant. Fluorescent temperature/pH responsive p(NIPAM-co-5% acrylic acid)-rhodamine B particles were studied. The results confirm the attachment of rhodamine B to the microgel particles. The long chains attached to the particles caused the particles to be poly-dispersed which suggests non-uniformity of particle size and behavior. Fluorescent temperature/pH responsive poly(N-isopropylacrylamide-co-5% lucifer yellow) (p(NIPAM-co-5% LY)) microgel particles were tested for toxicity. The particles were negatively charged, mono-dispersed and were approximately 250 nm in diameter at 15°C. The toxicity of different concentrations of p(NIPAM-co-5% LY), p(NIPAM) and NIPAM monomer was tested on two cell lines (HeLa and Vero). The results show that the two particles maintain cell viability over 80% (for both cell lines HeLa and Vero) up to a concentration of 3 mg/mL while NIPAM monomer showed a cell viability of over 80% at a concentration equal to or less than 0.3 mg/mL. The fourth experimental chapter explores the opportunity of using microgel particles as an emulsifier. p(NIPAM-co-5% acrylic acid)-hexenol particles with both hydrophilic and hydrophobic groups in their molecular structure were used to stabilize two emulsions (tricaprylin-in-water and hexadecane-in-water). The stability of the emulsions increased with increasing the concentration of the microgel. For the tricaprylin-in-water emulsion, a concentration of 0.3% w/v of the novel microgel particles managed to stabilize the emulsion for a week. In case of the hexadecane emulsion in water, 0.45% w/v microgel particles could show an increase in the emulsion stability and a decrease in the creaming."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Synthesis, physico-chemical properties and potential applications of colloidal gel particles"]}]}],"canonical_facts":{"dc:contributor.advisor":["Snowden, Martin","Alexander, Bruce"],"dc:creator":["Mohsen Momee, Reham M."],"dc:date":["2015-03"],"dc:date.issued":["2015-03"],"dc:description.abstract":["Four new N-isopropylacrylamide (NIPAM) based particles have been synthesized and characterized. The first experimental chapter reports that fluorescent poly(Nisopropylacrylamide-co-5% vinyl cinnamate) microgels were deposited on different solid surfaces to produce new environmental responsive surfaces. The mass of microgel particles deposited on glass pre-treated with acid, glass pre-treated with base, quartz, stainless steel, gold and Teflon at 25°C and 60°C was determined using fluorescence spectroscopy. The factors affecting the adsorption/desorption of the microgel particles were also investigated. The study shows that the solid surface charge is the most significant factor, followed by that of surface roughness and temperature; meanwhile, the hydrophobicity/hydrophilicity of the surface was the least significant. Fluorescent temperature/pH responsive p(NIPAM-co-5% acrylic acid)-rhodamine B particles were studied. The results confirm the attachment of rhodamine B to the microgel particles. The long chains attached to the particles caused the particles to be poly-dispersed which suggests non-uniformity of particle size and behavior. Fluorescent temperature/pH responsive poly(N-isopropylacrylamide-co-5% lucifer yellow) (p(NIPAM-co-5% LY)) microgel particles were tested for toxicity. The particles were negatively charged, mono-dispersed and were approximately 250 nm in diameter at 15°C. The toxicity of different concentrations of p(NIPAM-co-5% LY), p(NIPAM) and NIPAM monomer was tested on two cell lines (HeLa and Vero). The results show that the two particles maintain cell viability over 80% (for both cell lines HeLa and Vero) up to a concentration of 3 mg/mL while NIPAM monomer showed a cell viability of over 80% at a concentration equal to or less than 0.3 mg/mL. The fourth experimental chapter explores the opportunity of using microgel particles as an emulsifier. p(NIPAM-co-5% acrylic acid)-hexenol particles with both hydrophilic and hydrophobic groups in their molecular structure were used to stabilize two emulsions (tricaprylin-in-water and hexadecane-in-water). The stability of the emulsions increased with increasing the concentration of the microgel. For the tricaprylin-in-water emulsion, a concentration of 0.3% w/v of the novel microgel particles managed to stabilize the emulsion for a week. In case of the hexadecane emulsion in water, 0.45% w/v microgel particles could show an increase in the emulsion stability and a decrease in the creaming."],"dc:format":["application/pdf"],"dc:identifier.uri":["https://gala.gre.ac.uk/id/eprint/18140/1/Reham%20M.%20Mohsen%20Momee%202015.pdf"],"dc:language":["en"],"dc:publisher.department":["Department of Pharmaceutical, Chemical and Environmental Sciences"],"dc:publisher.institution":["University of Greenwich"],"dc:relation.isreferencedby":["https://gala.gre.ac.uk/id/eprint/18140/"],"dc:subject":["QD Chemistry"],"dc:title":["Synthesis, physico-chemical properties and potential applications of colloidal gel particles"],"dc:type":["Thesis"],"dc:type.qualificationlevel":["doctoral"],"dc:type.qualificationname":["phd"]},"updated_at":"2026-07-24T02:25:53Z"}