Theory of polymer adsorption at interfaces

Hoeve, C. A. J.

doi:10.1002/polc.5070340103

Cited by 62 publications

(5 citation statements)

References 20 publications

(15 reference statements)

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“…It should be noted that, even when at −0.5 to −0.6 V vs SCE, the adsorption of phosphate ions is not favorable, the phosphate ion presence will influence the ionic strength, and then the interaction between BSA and P103 will clearly modify the structure of the BSA protein. It is well known that several structures are possible for the adsorption of pluronics − and proteins. ,, These structures are dependent on the ionic strength of the medium, which in our study is given by the phosphate ions.…”

Section: Resultsmentioning

confidence: 89%

Adsorption and Interaction of Bovine Serum Albumin and Pluronic P103 Triblock Copolymer on a Gold Electrode: Double-Layer Capacitance Measurements

et al. 2020

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The interactions of proteins and other molecules and their adsorption onto substrates is a fascinating topic that has been applied to surface technologies, biosensors, corrosion studies, biotechnologies, and other fields. The success of these applications requires a previous characterization using some analytical techniques that, ordinarily, are not electrochemical. This work proposes analyzing the variation of the double-layer capacitance obtained through impedance electrochemical spectroscopy as an alternative strategy to show evidence of the interactions between proteins and triblock copolymers. The proposal is supported through the study of the interaction and adsorption of bovine serum albumin (BSA) and a commercial triblock copolymer (P103) in phosphate buffer on a gold electrode. The double-layer capacitance and the apparent interface thickness vs polarization potential curves as well as the potential of zero charge for pure P103 (0.6 wt %, corresponding to 6 g L –1 ), pure BSA (3 mg mL –1 ), and P103-BSA solutions (0.6 wt % and 3 mg mL –1 , respectively) are sensitive enough to show not only the interaction and the adsorption of the species but also the polarization potential where these interactions are taking place. A qualitative and quantitative analysis concerning the double-layer capacitance behavior is given. The significance and impact of this work is also presented.

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Section: Resultsmentioning

confidence: 89%

Adsorption and Interaction of Bovine Serum Albumin and Pluronic P103 Triblock Copolymer on a Gold Electrode: Double-Layer Capacitance Measurements

et al. 2020

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“…It should also be noted that the D h of AuNPs after physical adsorption of PEG (26 nm) was significantly smaller than that of PEG–SH covalently grafted on the same AuNPs (48 nm), suggesting that the adsorbed PEG chains adopt a loop-and-train-tail conformation on the surface of the AuNPs due to polyvalent interactions. The theoretical study given by Simah et al demonstrated that for an adsorbed polymer on a solid surface show three types of segment sequences, “trains” represent the adsorbed segments, “loops” represent the sequences of free segments connecting successive trains, and “tails” represent the nonadsorbed chain ends. , The adsorption density (σ A ) of PEG could be quantified by 1 H NMR based on a method previously reported (for details see SI). The saturated σ A for all three types of PEG was around 0.020 chains/nm 2 (Figure d).…”

Section: Resultsmentioning

confidence: 93%

“…The theoretical study given by Simah et al demonstrated that for an adsorbed polymer on a solid surface show three types of segment sequences, "trains" represent the adsorbed segments, "loops" represent the sequences of free segments connecting successive trains, and "tails" represent the nonadsorbed chain ends. 31,32 The adsorption density (σ A ) of PEG could be quantified by 1 H NMR based on a method previously reported (for details see SI). 30 The saturated σ A for all three types of PEG was around 0.020 chains/nm 2 (Figure 1d).…”

Section: Resultsmentioning

confidence: 99%

Physisorption of Poly(ethylene glycol) on Inorganic Nanoparticles

Xue

Gao

et al. 2022

ACS Nano

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Poly(ethylene glycol) (PEG) is the most widely used polymer to decorate inorganic nanoparticles (NPs) by the “grafting-to” method for antifouling properties. PEG also shows diverse supramolecular interactions with nanoparticle surfaces and polar molecules, suggesting that the physisorption between PEG chains and NPs cannot be ignored in the “grafting-to” process. However, the effect of physisorption of PEG to NPs on the process of chemisorption has been rarely studied. Herein, we report that unfunctionalized PEG is physically adsorbed on various NPs by polyvalent supramolecular interactions, adopting “loop-and-train-tail” conformations. We investigated the effect of molecular weight of PEG and ligands of the NPs on the conformation of PEG chains by experimental methods and simulation. It is demonstrated that the physisorption of PEG on NPs can facilitate the chemisorption in the initial stages but delays it in the later stages during the “grafting-to” process. This work provides a deeper understanding of the conformation of physisorbed PEG on NPs and the relationship between physisorption and chemisorption.

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“…We find then from cq. (20) that s = ( w + 4)-1 (41) This value corresponds to the inverse of the partition function for one segment in a free chain. It follows from eq.…”

Section: Partition Function For One Chainmentioning

confidence: 99%

On the theory of polymer adsorption at an interface

Hoeve

1977

J. polym. sci., C Polym. symp.

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SYNOPSISExact results arc given for the grand partition function of a single modcl chain adsorbed at an interface. Thc model chosen corresponds to a walk on a 5-choice, instead of a 6-choice, simple cubic lattice by disallowing step rcversals. The flexibility of this model is rendered variable by assigning different weights to consecutive steps made in the same direction. The obtained results are compared to those of a previous model for Gaussian chains. Satisfactory agreement between the models allows the previously undetermined flexibility parameter to be determincd. The segment density in the vicinity of the interface is obtained as a function of this parameter. Correspondence with polymer chains is established through this parameter. We conjecture that the volume fraction of segments in the diffuse layer resulting from the loops does not cxcecd 0.1, even when the volume fraction i n the interface is unity.

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Theory of polymer adsorption at interfaces

Cited by 62 publications

References 20 publications

Adsorption and Interaction of Bovine Serum Albumin and Pluronic P103 Triblock Copolymer on a Gold Electrode: Double-Layer Capacitance Measurements

Adsorption and Interaction of Bovine Serum Albumin and Pluronic P103 Triblock Copolymer on a Gold Electrode: Double-Layer Capacitance Measurements

Physisorption of Poly(ethylene glycol) on Inorganic Nanoparticles

On the theory of polymer adsorption at an interface

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