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Two-Dimensional Cellular Patterning on a Polymer Film Based on Interfacial Stiffness.

Kento Kawabata¹, Masayasu Totani¹, Daisuke Kawaguchi^1,2

¹Department of Applied Chemistry, Kyushu University, Fukuoka 819-0395, Japan.

Langmuir : the ACS Journal of Surfaces and Colloids

|December 14, 2021

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Researchers developed a new method to control polymer film stiffness using inkjet-printed silica nanoparticles (SNPs). This technique allows for precise, two-dimensional mechanical property regulation at the water interface, influencing cell behavior.

Area of Science:

Materials Science
Polymer Science
Nanotechnology

Background:

The mechanical properties of polymer films significantly impact their material functions, especially at interfaces.
Controlling these properties in two dimensions is crucial for advanced applications.
The water interface presents unique challenges for material property manipulation.

Purpose of the Study:

To propose a novel strategy for two-dimensional mechanical property regulation of polymer films.
To investigate the use of inkjet-drawn silica nanoparticles (SNPs) underneath a polymer film for property control.
To assess the influence of controlled mechanical properties on cell adhesion.

Main Methods:

Fabrication of a poly(2-hydroxyethyl methacrylate) (PHEMA) film on a substrate patterned with inkjet-drawn SNPs.

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Characterization of film surface properties using X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM).

Evaluation of in-plane stiffness heterogeneity and NIH/3T3 fibroblast cell adhesion.

Main Results:

The PHEMA film surface was confirmed to be flat and chemically homogeneous by XPS and AFM.
The underlying SNP lines induced in-plane heterogeneity in the film's stiffness.
NIH/3T3 fibroblast cells selectively adhered and aggregated on areas with underlying SNP patterns.

Conclusions:

Inkjet printing of SNPs offers a promising method for two-dimensional mechanical regulation of polymer films at the water interface.
Controlled stiffness heterogeneity influences selective cell adhesion and aggregation.
This approach has potential for applications in biomaterials and cell culture technologies.