Density of Obstacles Affects Diffusion in Adsorbed Polymer Layers

Cristian Rodríguez-Tinoco; David Nieto Simavilla; Rodney D. Priestley; Michael Wübbenhorst; Simone Napolitano

doi:10.1021/acsmacrolett.9b00999

Density of Obstacles Affects Diffusion in Adsorbed Polymer Layers

Cristian Rodríguez-Tinoco, David Nieto Simavilla, Rodney D. Priestley, Michael Wübbenhorst, Simone Napolitano

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

Abstract

The translational diffusion of molecules dispersed into polymer matrices slows down tremendously when approaching a nonrepulsive interface. To unravel the origin of this phenomenon, we investigated the diffusion of molecular probes in the direction normal to an adsorbing wall. Using adsorbed polymer layers as matrices, we were able to decouple interfacial and finite size effects and determined the relation between the diffusion time and the area available at the polymer/solid interface. Based on the results of our investigation, we present a physical picture, suggesting that the reduction in diffusion rate is correlated to the degree of chain adsorption onto the substrate, that is, the density of surface obstacles encountered by tracer molecules.

Original language	English (US)
Pages (from-to)	318-322
Number of pages	5
Journal	ACS Macro Letters
Volume	9
Issue number	3
DOIs	https://doi.org/10.1021/acsmacrolett.9b00999
State	Published - Mar 17 2020
Externally published	Yes

All Science Journal Classification (ASJC) codes

Materials Chemistry
Polymers and Plastics
Inorganic Chemistry
Organic Chemistry

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10.1021/acsmacrolett.9b00999

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title = "Density of Obstacles Affects Diffusion in Adsorbed Polymer Layers",

abstract = "The translational diffusion of molecules dispersed into polymer matrices slows down tremendously when approaching a nonrepulsive interface. To unravel the origin of this phenomenon, we investigated the diffusion of molecular probes in the direction normal to an adsorbing wall. Using adsorbed polymer layers as matrices, we were able to decouple interfacial and finite size effects and determined the relation between the diffusion time and the area available at the polymer/solid interface. Based on the results of our investigation, we present a physical picture, suggesting that the reduction in diffusion rate is correlated to the degree of chain adsorption onto the substrate, that is, the density of surface obstacles encountered by tracer molecules.",

author = "Cristian Rodr{\'i}guez-Tinoco and Simavilla, {David Nieto} and Priestley, {Rodney D.} and Michael W{\"u}bbenhorst and Simone Napolitano",

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T1 - Density of Obstacles Affects Diffusion in Adsorbed Polymer Layers

AU - Rodríguez-Tinoco, Cristian

AU - Simavilla, David Nieto

AU - Priestley, Rodney D.

AU - Wübbenhorst, Michael

AU - Napolitano, Simone

PY - 2020/3/17

Y1 - 2020/3/17

N2 - The translational diffusion of molecules dispersed into polymer matrices slows down tremendously when approaching a nonrepulsive interface. To unravel the origin of this phenomenon, we investigated the diffusion of molecular probes in the direction normal to an adsorbing wall. Using adsorbed polymer layers as matrices, we were able to decouple interfacial and finite size effects and determined the relation between the diffusion time and the area available at the polymer/solid interface. Based on the results of our investigation, we present a physical picture, suggesting that the reduction in diffusion rate is correlated to the degree of chain adsorption onto the substrate, that is, the density of surface obstacles encountered by tracer molecules.

AB - The translational diffusion of molecules dispersed into polymer matrices slows down tremendously when approaching a nonrepulsive interface. To unravel the origin of this phenomenon, we investigated the diffusion of molecular probes in the direction normal to an adsorbing wall. Using adsorbed polymer layers as matrices, we were able to decouple interfacial and finite size effects and determined the relation between the diffusion time and the area available at the polymer/solid interface. Based on the results of our investigation, we present a physical picture, suggesting that the reduction in diffusion rate is correlated to the degree of chain adsorption onto the substrate, that is, the density of surface obstacles encountered by tracer molecules.

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Density of Obstacles Affects Diffusion in Adsorbed Polymer Layers

Abstract

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