Hypothesis: Solid-state polymer adsorption offers a distinct approach for surface modification. These ultrathin, so-called Guiselin layers can easily be obtained by placing a polymer melt in contact with an interface, followed by a removal of the non-adsorbed layer with a good solvent. While the mechanism of formation has been well established for Guiselin layers, their stability, crucial from the perspective of materials applications, is not. The stability is a trade-off in the entropic penalty between cooperative detachment of the number of segments directly adsorbed on the substrate and consecutively pinned monomers.
Experiments: Experimental model systems of Guiselin layers of polystyrene (PS) on silicon wafers with native oxide layer on top were employed. The stability of the adsorbed layers was studied as a function of PS molecular weight and polydispersibility by various microscopic and spectroscopic tools as well as quasi-static contact angle measurements.
Findings: Adsorbed layers from low molecular weight PS were disrupted with typical spinodal decomposition patterns whereas high molecular weight (>500 kDa) PS resulted in stable, continuous layers. Moreover, we show that Guiselin layers offer an enticing way to modify a surface, as demonstrated by adsorbed PS that imparts a hydrophobic character to initially hydrophilic silicon wafers.
|Julkaisu||Journal of Colloid and Interface Science|
|Varhainen verkossa julkaisun päivämäärä||21 heinäk. 2021|
|DOI - pysyväislinkit|
|Tila||Julkaistu - tammik. 2022|
|OKM-julkaisutyyppi||A1 Julkaistu artikkeli, soviteltu|
SormenjälkiSukella tutkimusaiheisiin 'Solid-state polymer adsorption for surface modification: The role of molecular weight'. Ne muodostavat yhdessä ainutlaatuisen sormenjäljen.
01/05/2018 → 31/12/2022
Projekti: Academy of Finland: Other research funding
STRONGAD: Strongly adsorbed polymer layers for modification of cellulose surfaces towards new functional materials
Kontturi, E. & Xu, W.
01/01/2019 → 31/12/2020
Projekti: Other external funding: Other foreign funding