Browsing University of Waterloo by Author "Duhamel, Jean"
Now showing items 1-20 of 27
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Application of Pyrene Fluorescence to the Characterization of Hydrophobically Modified Starch Nanoparticles
Kim, Damin; Amos, Ryan; Gauthier, Mario; Duhamel, Jean (American Chemical Society, 2018-06-25)Several aspects of pyrene fluorescence were applied to gain an insight into the nature of the microdomains in hydrophobically modified starch nanoparticles (HM-SNPs), prepared by reacting SNPs with propionic and hexanoic ... -
Arborescent Poly(L-glutamic acid)s as Standards to Study the Dense Interior of Polypeptide Mesoglobules by Pyrene Excimer Fluorescence
Hall, Timothy; Whitton, Greg; Casier, Remi; Gauthier, Mario; Duhamel, Jean (American Chemical Society, 2018-10-01)A series of arborescent poly(l-glutamic acid)s of generations 0 to 3 (PGA(GY) with Y = 0–3) were randomly labeled with 1-pyrenemethylamine to yield several Py-PGA(GY) constructs with pyrene contents ranging between 2.5 and ... -
Characterization of the Distribution of Pyrene Molecules in Confined Geometries with the Model Free Analysis
Cao, Xinzhi; Casier, Remi; Little, Hunter; Duhamel, Jean (American Chemical Society, 2017-12-21)Evidence is provided showing that global Model Free Analysis (MFA) of monomer and excimer fluorescence decays of pyrene dissolved in aqueous solutions of sodium dodecyl sulfate (SDS) provides the same structural and dynamic ... -
Characterization of the Long-Range Internal Dynamics of Pyrene-Labeled Macromolecules by Pyrene Excimer Fluorescence
Farhangi, Shiva; Casier, Remi; Li, Lu; Thoma, Janine L.; Duhamel, Jean (American Chemical Society, 2016-12)The long-range internal dynamics (LRID) of 74 pyrene-labeled macromolecules (PyLMs) were characterized in four solvents representing a broad range of dielectric constants equal to 2.4 (toluene), 7.6 (tetrahydrofuran, THF), ... -
Chemical Modification of Polyisobutylene Succinimide Dispersants and Characterization of Their Associative Properties
Pirouz, Solmaz; Wang, Yulin; Chong, J. Michael; Duhamel, Jean (American Chemical Society, 2015-09-17)The secondary amines found in b-PIBSI dispersants prepared by attaching two polyisobutylene chains to a polyamine core via two succinimide moieties were reacted with ethylene carbonate (EC). The reaction generated urethane ... -
Conformation of Pyrene-Labeled Amylose in DMSO Characterized with the Fluorescence Blob Model
Li, Lu; Duhamel, Jean (American Chemical Society, 2016-10-25)Amylose and poly(methyl acrylate) were randomly labeled with pyrene to yield a series of Py-Amylose and Py-PMA constructs, and their ability to form excimer in DMSO was characterized quantitatively by steady-state and ... -
Design, characterization, optical and photophysical properties of novel thiophene monomers and polymers containing pyrene moieties linked via rigid and flexible spacers
Morales-Espinoza, Eric G.; Ruiu, Andrea; Valderrama-Garcia, Bianca X.; Duhamel, Jean; Rivera, Ernesto (Elsevier, 2019-02-01)Herein, we report the synthesis of three novel thiophene monomers connected to pyrene moieties via a flexible oligo(ethylene glycol) (OEG) spacer with an oxygen -to-pyrene (T1), a flexible OEG spacer with an oxygen ... -
Detection of Nitroaromatics Using the Excimer Fluorescence of Pyrene-Labeled Starch Nanoparticles
Patel, Sanjay; Seet, Jonathan; Li, Lu; Duhamel, Jean (American Chemical Society, 2019-09-09)Starch nanoparticles (SNPs) were hydrophobically modified using 1-pyrenebutyric acid (PyBA) with degrees of substitution (DS) between 0.0006 and 0.11. Fluorescence quenching studies were conducted on the pyrene-labeled ... -
Dimensions of Quinoline-Based Foldamers Labeled with Oligo(phenylene vinylene) Probed in Solution by Time-Resolved Fluorescence Anisotropy
Wang, Jingqi; Little, Hunter; Duhamel, Jean; Li, Xuesong; Markandeya, Nagula; Maurizot, Victor; Huc, Ivan (American Chemical Society, 2019-07-24)A series of oligoquinolines (Qn with n = 1 – 32) was prepared with an oligo(phenylene vinylene) (OPV) fluorophore covalently attached at one end via a rigid amide bond. The fluorescence decays of the OPV-Qn solutions in ... -
DiPyMe in SDS Micelles: Artifacts and Their Implications in the Interpretation of Micellar Properties
Fowler, Michael; Hisko, Victoria; Henderson, Jason; Casier, Remi; Li, Lu; Thoma, Janine L.; Duhamel, Jean (American Chemical Society, 2015-11-10)This study provides experimental evidence that di(1-pyrenylmethyl) ether or DiPyMe, a well-known fluorescent probe employed to determine the microviscosity of surfactant or polymeric micelles, is being hydrolyzed in the ... -
Extraction of Oil from Oil Sands Using Thermoresponsive Polymeric Surfactants
Yang, Bingqing; Duhamel, Jean (American Chemical Society, 2015-03-18)Several thermoresponsive block copolymers constituted of a poly(ethylene glycol) (PEG) and a poly(2-(2-methoxyethoxy) ethyl methacrylate) (PMEO(2)MA) block were prepared by atom transfer radical polymerization (ATRP) and ... -
Hydrophobic and Elastic Forces Experienced by a Series of Pyrene End-Labeled Poly(ethylene oxide)s Interacting with Sodium Dodecyl Sulfate Micelles
Raimbault, Justin; Casier, Remi; Little, Hunter; Duhamel, Jean (American Chemical Society, 2018-07-30)A series of pyrene end-labeled poly(ethylene oxide)s (Py2-PEO(x) with x equal to 2, 3.4, 5, 6, 7.8, and 10 kg mol–1) were synthesized, and their interactions with SDS micelles were characterized by steady-state and ... -
Long Range Polymer Chain Dynamics Studied by Fluorescence Quenching
Farhangi, Shiva; Duhamel, Jean (American Chemical Society, 2016-09-13)Over the years, fluorescence quenching experiments have provided a robust analytical means to retrieve information about the internal dynamics of macromolecules in general and the long range polymer chain dynamics (LRPCD) ... -
Long-Range, Polymer Chain Dynamics of a "Stiff" Polymer. Fluorescence from Poly(isobutylene-alt-maleic anhydride) with N-(1-Pyrenylmethyl)succinimide Groups
Thoma, Janine L.; Duhamel, Jean; Li, Mei-Jin; Bertocchi, Michael J.; Weiss, Richard G. (American Chemical Society, 2017-04-25)The steady-state fluorescence (SSF) spectra and time resolved fluorescence (TRF) decays of five poly(isobutylene-alt-maleic anhydride) copolymers (PIMA), randomly labeled with N-(1-pyrenyl methyl)succinimide groups (Py-PIMA), ... -
Membrane binding and oligomer formation by the calcium-dependent lipopeptide antibiotic A54145: a quantitative study with pyrene excimer fluorescence
Zhang, TianHua; Taylor, Scott D.; Palmer, Michael; Duhamel, Jean (Elsevier, 2016-09-20)A54145 is a lipopeptide antibiotic related to daptomycin that permeabilizes bacterial cell membranes. Its action requires both calcium and phosphatidylglycerol in the target membrane, and it is accompanied by the formation ... -
New approaches to characterize polymeric oil additives in solution based on pyrene excimer fluorescence
Pirouz, Solmaz; Duhamel, Jean (Wiley, 2017-01-01)Maleated polyolefins (MaPOs) such as maleated ethylene propylene copolymers or polyisobutylene terminated at one end with a succininic anhydride can be used as polymeric dispersants in engine oils after reaction with ... -
Probing Side Chain Dynamics of Branched Macromolecules by Pyrene Excimer Fluorescence
Farhangi, Shiva; Duhamel, Jean (American Chemical Society, 2016-01-12)Four different pyrene-labeled polymers were prepared by radical copolymerization of n-butyl methacrylate (BMA) and 1-pyrenemethyl methacrylate (PyEG(0)-MA), 1-pyrenemethoxyethyl methacrylate (PyEG(1)-MA), 1-pyrene-methox ... -
Probing the Interactions between Mimics of Pour Point Depressants (PPDs) and Viscosity Index Improvers (VIIs) in Engine Oil Using Fluorescently Labeled PPDs
Gholami, Kiarash; Jiang, Sheng; Duhamel, Jean (American Chemical Society, 2019-03-18)The level of interpolymeric interactions experienced by a pyrene-labeled poly(octadecyl methacrylate) labeled with 6.7 mol% of 1-pyrenebutanol (Py(6.7)-PC18MA) was characterized by fluorescence in the presence of an amorphous ... -
Pyrene Excimer Fluorescence as a Direct and Easy Experimental Means to Characterize the Length Scale and Dynamics of Polypeptide
Casier, Remi; Duhamel, Jean (American Chemical Society, 2018-04-26)This report provides evidence that the blobs characterized through the application of the fluorescence blob model (FBM) to the analysis of the fluorescence decays acquired with pyrene-labeled polypeptides are equivalent ... -
Pyrenyl Derivative with a Four-Atom Linker That Can Probe the Local Polarity of Pyrene-Labeled Macromolecules
Farhangi, Shiva; Duhamel, Jean (American Chemical Society, 2016-02-04)The fluorescent probe 1-pyrenemethoxyethanol (PyMeEGOH) was designed to replace commercially available 1-pyrenebutanol (PyButOH) as an alternative fluorescent label to probe the internal dynamics and interior polarity of ...