Comparing polymer-surfactant complexes to polyelectrolytes

Gresham, Isaac J.; Johnson, Edwin C.; Robertson, Hayden; Willott, Joshua D.; Webber, Grant B.; Wanless, Erica J.; Nelson, Andrew R.J.; Prescott, Stuart W.

doi:10.1016/j.jcis.2023.10.101

Cited by 4 publications

(3 citation statements)

References 67 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…QCM is widely used for the construction of various types of biosensors − and can also be used to characterize the viscoelastic properties of thin polymer films such as polymer brushes. − We have recently employed QCM to quantify the extent of adsorption of either diblock copolymer nanoparticles or nanosized oil droplets onto model soft substrates ,, and for the conjugation of a globular protein to a PAGEO5MA brush via Schiff base chemistry . Herein we employ QCM to quantify the adsorption of PGMA 51 –PBzMA y nanoparticles ( y = 200, 400, or 800) onto PAGEO5MA brushes by determining the adsorbed mass per unit area (Γ, mg m –2 ). , …”

Section: Resultsmentioning

confidence: 99%

Controlling Adsorption of Diblock Copolymer Nanoparticles onto an Aldehyde-Functionalized Hydrophilic Polymer Brush via pH Modulation

Astier,

Johnson,

Norvilaite

et al. 2024

Langmuir

Self Cite

View full text Add to dashboard Cite

Sterically stabilized diblock copolymer nanoparticles with a well-defined spherical morphology and tunable diameter were prepared by RAFT aqueous emulsion polymerization of benzyl methacrylate at 70 °C. The steric stabilizer precursor used for these syntheses contained pendent cis-diol groups, which means that such nanoparticles can react with a suitable aldehyde-functional surface via acetal bond formation. This principle is examined herein by growing an aldehydefunctionalized polymer brush from a planar silicon wafer and studying the extent of nanoparticle adsorption onto this model substrate from aqueous solution at 25 °C using a quartz crystal microbalance (QCM). The adsorbed amount, Γ, depends on both the nanoparticle diameter and the solution pH, with minimal adsorption observed at pH 7 or 10 and substantial adsorption achieved at pH 4. Variable-temperature QCM studies provide strong evidence for chemical adsorption, while scanning electron microscopy images recorded for the nanoparticle-coated brush surface after drying indicate mean surface coverages of up to 62%. This fundamental study extends our understanding of the chemical adsorption of nanoparticles on soft substrates.

show abstract

Section: Resultsmentioning

confidence: 99%

Controlling Adsorption of Diblock Copolymer Nanoparticles onto an Aldehyde-Functionalized Hydrophilic Polymer Brush via pH Modulation

Astier,

Johnson,

Norvilaite

et al. 2024

Langmuir

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, for in situ measurements of the “thick” PNIPAM film, a model analogous to our NR approach was employed, which utilizes a piecewise cubic hermite interpolating polynomial (PCHIP) with a single knot (spline control point) placed between the proximal polymer slab and the water-fronting media . Here, a simple slab is insufficient as it does not capture the diffuse nature of this significantly thicker brush . The model structure utilized for the in situ analysis was solvent, polymer spline, polymer slab, silica, and silicon.…”

Section: Methodsmentioning

confidence: 99%

“… 46 Here, a simple slab is insufficient as it does not capture the diffuse nature of this significantly thicker brush. 47 The model structure utilized for the in situ analysis was solvent, polymer spline, polymer slab, silica, and silicon. For both dry and in situ measurements, the model optical properties of the polymer brush were set using a Cauchy model, with parameters fixed at A = 1.45 and B = 0.005.…”

Section: Methodsmentioning

confidence: 99%

Solvent-Modulated Specific Ion Effects: Poly(N-isopropylacrylamide) Brushes in Nonaqueous Electrolytes

Robertson,

Gresham,

Nelson

et al. 2023

Langmuir

Self Cite

View full text Add to dashboard Cite

Pertinent to cryopreservation as well as energy storage and batteries, nonaqueous electrolytes and their mixtures with water were investigated. In particular, specific ion-induced effects on the modulation of a poly(N-isopropylacrylamide) (PNIPAM) brush were investigated in various dimethyl sulfoxide (DMSO)−water solvent mixtures. Spectroscopic ellipsometry and neutron reflectometry were employed to probe changes in brush swelling and structure, respectively. In water-rich solvents (i.e., pure water and 6 mol % DMSO), PNIPAM undergoes a swollen to collapsed thermotransition with increasing temperature, whereby a forward Hofmeister series was noted; K + and Li + electrolytes composed of SCN − and I − salted-in (stabilized) PNIPAM chains, and electrolytes of Cl − and Br − salted-out (destabilized) the polymer. The cation was seen to play a lesser role than that of the anion, merely modulating the magnitude of the anion effect. In 70 mol % DMSO, a collapsed to swollen thermotransition was noted for PNIPAM. Here, concentration-dependent specific ion effects were observed; a forward series was observed in 0.2 mol % electrolytes, whereas increasing the electrolyte concentration to 0.9 mol % led to a series reversal. While no thermotransition was observed in pure DMSO, a solvent-induced specific ion series reversal was noted; SCN − destabilized the brush and Cl − stabilized the brush. Both series reversals are attributed to the delicate balance of interactions between the solvent, solute (ion), and substrate (brush). Namely, the stability of the solvent clusters was hypothesized to drive polymer solvation.

show abstract

Electrical conductivity of stevia rebaudiana-surfactant mixture aqueous solution: Roles of temperature and sugar substitute concentration

Jebali,

El Aferni,

Guettari

et al. 2024

Chemical Physics

View full text Add to dashboard Cite

Comparing polymer-surfactant complexes to polyelectrolytes

Cited by 4 publications

References 67 publications

Controlling Adsorption of Diblock Copolymer Nanoparticles onto an Aldehyde-Functionalized Hydrophilic Polymer Brush via pH Modulation

Controlling Adsorption of Diblock Copolymer Nanoparticles onto an Aldehyde-Functionalized Hydrophilic Polymer Brush via pH Modulation

Solvent-Modulated Specific Ion Effects: Poly(N-isopropylacrylamide) Brushes in Nonaqueous Electrolytes

Electrical conductivity of stevia rebaudiana-surfactant mixture aqueous solution: Roles of temperature and sugar substitute concentration

Contact Info

Product

Resources

About