A5074133786- Polymer Surface Interaction Studies
- Electrostatics and Colloid Interactions
- Marine Biology and Environmental Chemistry
- Nanopore and Nanochannel Transport Studies
- Material Dynamics and Properties
- Hydrogels: synthesis, properties, applications
- Force Microscopy Techniques and Applications
- Surface Modification and Superhydrophobicity
- Spectroscopy and Quantum Chemical Studies
- Surfactants and Colloidal Systems
- Pickering emulsions and particle stabilization
- Microfluidic and Capillary Electrophoresis Applications
- Microfluidic and Bio-sensing Technologies
- Molecular Junctions and Nanostructures
- Bacteriophages and microbial interactions
- Microplastics and Plastic Pollution
University of Houston
2022-2025
M13 phage are a novel microrheological probe that sensitive to polymer relaxations, capturing DNA dynamics and revealing universal scaling behaviors across the unentangled entangled regimes.
We investigate the structure and dynamics of unentangled semidilute solutions sodium polystyrenesulfonate (NaPSS) using small-angle neutron scattering (SANS) spin–echo (NSE) spectroscopy. The effects electrostatic interactions chain are examined as a function ionic strength polymer concentration, respectively. SANS profiles exhibit characteristic structural peak, signature polyelectrolyte solutions, that can be fit with combination semiflexible excluded volume form factor reference...
The structure and dynamics of polyelectrolytes differ from those neutral polymers. How these differences affect the transport anisotropic particles remains incompletely understood. Here, we investigate semiflexible M13 bacteriophage (phage) in aqueous semidilute solutions sodium polystyrenesulfonate (PSS) with various ionic strengths using fluorescence microscopy. We tune characteristic length scales PSS two molecular weights 68 2200 kDa by varying strength 10–6 to 10–1 M. Phage exhibit...
We examined the effects of alkyl carbon spacer length (CSL) and molecular weight on fouling resistance release properties zwitterionic poly(sulfobetaine methacrylate) brushes. Using surface-initiated atom transfer radical polymerization, we synthesized two series brushes with CSL = 3 4 from 19 to 1500 kg ·mol–1, corresponding dry brush thickness around 6 180 nm. The was nearly completely wet water (independent weight), whereas exhibited a strong increase in contact angle weight. Though...
Through a combination of in situ ellipsometry and streaming zeta potential measurements, we investigated the swelling behavior weak polybasic brushes as function pH fraction ionizable monomers f. The monomer (2-(dimethylamino)ethyl acrylate, DMAEA) was precisely tuned by mixing neutral hydrophilic (2-hydroxyethyl HEA) from f = 1.00 to 0.00. All charge containing fractions show pH-responsive behavior. At acidic pH, are within strongly charged osmotic brush regime, ratio increases with...
We investigate the effects of polymer molecular weight on structure and dynamics a model colloid-polymer bridging system using confocal microscopy. Polymer-induced interactions between trifluoroethyl methacrylate-co-tert-butyl methacrylate (TtMA) copolymer particles poly(acrylic acid) (PAA) polymers Mw 130, 450, 3000, or 4000 kDa normalized concentrations c/c* ranging from 0.05 to 2 are driven by hydrogen bonding PAA one particle stabilizers. At constant volume fraction ϕ = 0.05, form...
Understanding molecular transport in polyelectrolyte brushes (PEBs) is crucial for applications such as separations, drug delivery, anti-fouling, and biosensors, where structural features of the polymer control intermolecular interactions. The complex structure local heterogeneity PEBs, while theoretically predicted, are not easily accessed with conventional experimental methods. In this work, we use 3D single-molecule tracking to understand behavior within a cationic...
We investigate the combined effects of ionizable monomer fraction
We examined the effects of alkyl carbon spacer length (CSL) and molecular weight on fouling resistance release properties zwitterionic poly(sulfobetaine methacrylate) brushes. Using surface-initiated atom transfer radical polymerization, we synthesized two series brushes with CSL = 3 4 from 19 - 1500 kg mol-1, corresponding to dry brush thickness around 6 180 nm. The was nearly completely wet water (independent weight), whereas exhibited a strong increase in contact angle weight. Though had...