The Effect of Polymer Substrate Surface Basicity on the Adsorption of a Cationic Polyacrylamide

Angelopoulos, Anastasios P.; Matienzo, Luis J.; Benziger, J.

doi:10.1006/jcis.1999.6096

Cited by 13 publications

(30 citation statements)

References 10 publications

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“…The solution was stirred vigorously using a ''star'' stir bar (VWR) for a minimum of 2 h and until the polymer was completely dissolved. Concentrations as low as 0.01 g L À1 had been previously found to be sufficient to achieve equilibrium polymer surface coverage on various substrate surfaces [14,15,18] and was also found to be sufficient in the case of the substrates employed in the present study. A lower concentration was used at the higher pH to avoid high viscosity solutions which made effective rinsing from the substrate surface difficult.…”

Section: Methodsmentioning

confidence: 70%

“…[2] However, irreversible adsorption of the cationic polymer binder to be employed in this study has been previously observed on various substrate surfaces, including gold. [14,15] The detailed adsorption mechanisms by which the polymer binds to metals is uncertain but is hypothesized to result from the formation of an image charge in the substrate material. Our primary reason for the use of gold is that it permits accurate assessment of the electrical resistivity of the deposited coatings.…”

Section: Full Papermentioning

confidence: 99%

“…It was hypothesized that, unlike the cationic polyacrylamide, for which adsorption has been previously found to be rapid and thermodynamically driven, [14,18,19] concentration would play a larger role with respect to kinetically-driven multilayer formation from carbon nanoparticle suspensions. To test this hypothesis, the carbon content in the suspension was reduced to 1% by weight.…”

Section: Effect Of Graphite Suspension Concentrationmentioning

confidence: 99%

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Electrically Conductive Thin Films Prepared from Layer‐by‐Layer Assembly of Graphite Platelets

Alazemi

Dutta

Wang

et al. 2009

Adv Funct Materials

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Layer‐by‐layer (LBL) assembly of carbon nanoparticles for low electrical contact resistance thin film applications is demonstrated. The nanoparticles consist of irregularly shaped graphite platelets, with acrylamide/ββ‐methacryl‐oxyethyl‐trimethyl‐ammonium copolymer as the cationic binder. Nanoparticle zeta (ζζ) potential and thereby electrostatic interactions are varied by altering the pH of graphite suspension as well as that of the binder suspension. Film thickness as a function of zeta potential, immersion time, and the number of layers deposited is obtained using Monte Carlo simulation of the energy dispersive spectroscopy measurements. Multilayer film surface morphology is visualized via field‐emission scanning electron microscopy and atomic‐force microscopy. Thin film electrical properties are characterized using electrical contact resistance measurements. Graphite nanoparticles are found to self‐assemble onto gold substrates through two distinct yet overlapping mechanisms. The first mechanism is characterized by logarithmic carbon uptake with respect to the number of deposition cycles and slow clustering of nanoparticles on the gold surface. The second mechanism results from more rapid LBL nanoparticle assembly and is characterized by linear weight uptake with respect to the number of deposition cycles and a constant bilayer thickness of 15 to 21 nm. Thin‐film electrical contact resistance is found to be proportional to the thickness after equilibration of the bilayer structure. Measured values range from 1.6 mΩ cm−2 at 173 nm to 3.5 mΩ cm−2 at 276 nm. Coating volume resistivity is reduced when electrostatic interactions are enhanced during LBL assembly.

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Section: Methodsmentioning

confidence: 70%

Section: Full Papermentioning

confidence: 99%

Section: Effect Of Graphite Suspension Concentrationmentioning

confidence: 99%

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Electrically Conductive Thin Films Prepared from Layer‐by‐Layer Assembly of Graphite Platelets

Alazemi

Dutta

Wang

et al. 2009

Adv Funct Materials

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“…A more quantitative description of the effect of surface chemical composition on adsorbate coverage than that found in the previously cited study (6) was recently attempted during investigation of the adsorption of the cationic polyacrylamide previously described onto a perfluorosulfonate ionomer (PFSI) membrane. (13) The investigators wished to determine whether electrodes could be patterned directly onto the ionomer surface utilizing metallization from the liquid phase.…”

Section: Comparison With Experimentsmentioning

confidence: 97%

“…A recently published study attempted to relate, if only in a qualitative way, the effect of chemically heterogeneous substrate surface composition to adsorbate coverage (6). The study examined the adsorption of a random copolymer of a quaternary amine, acrylic acid, and acrylamide (a cationic polyacrylamide) from sulfuric acid solution onto various substrates composed of mixtures of bisphenol-based epoxies and acrylates of interest to the microelectronics industry.…”

Section: Comparison With Experimentsmentioning

confidence: 99%

Enthalpy-Driven Adsorption of Chain Molecules onto Chemically Heterogeneous Surfaces

Angelopoulos

2001

Journal of Colloid and Interface Science

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Surface engineering of PHBV by covalent collagen immobilization to improve cell compatibility

Wang

et al. 2008

J Biomedical Materials Res

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Covalent immobilization of collagen onto poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) film was achieved to improve its cell compatibility. Amide groups photografted on PHBV films were initially converted into amine groups through Hofmann degradation and collagen was then chemically bonded to amine groups, consequently forming the amide, amine, and collagen-modified PHBV. The structures of these modified PHBV films were confirmed by ATR-FTIR, XPS, and SEM analyses. Compared with that of PHBV film, surface wettability of the modified PHBV films enhanced remarkably. In particular, water contact angle of the collagen-modified PHBV film decreased from 65.0 degrees to 2.1 degrees within 130 s. Sheep chondrocytes cultured on PHBV and modified PHBV films were evaluated by cell adhesion test, MTT assay, and morphological observation under SEM. Results showed that the collagen-modified PHBV film had better cell adhesion and proliferation than other modified PHBV films and PHBV film. Chondrocytes on the collagen-modified PHBV film adhered through filopodia, spread by cytoplasmic webbing, and formed cells layer earlier than other modified ones, indicating that the collagen-modified PHBV is a promising biomaterial for cartilage tissue engineering.

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The Effect of Polymer Substrate Surface Basicity on the Adsorption of a Cationic Polyacrylamide

Cited by 13 publications

References 10 publications

Electrically Conductive Thin Films Prepared from Layer‐by‐Layer Assembly of Graphite Platelets

Electrically Conductive Thin Films Prepared from Layer‐by‐Layer Assembly of Graphite Platelets

Enthalpy-Driven Adsorption of Chain Molecules onto Chemically Heterogeneous Surfaces

Surface engineering of PHBV by covalent collagen immobilization to improve cell compatibility

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