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Synthesis of Soft Polysiloxane-urea Elastomers for Intraocular Lens Application

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High-density stable glasses formed on soft substrates.

Peng Luo¹, Sarah E Wolf², Shivajee Govind¹

¹Department of Chemistry, University of Pennsylvania, Philadelphia, PA, USA.

Nature Materials

|February 27, 2024

Summary

This summary is machine-generated.

Physical vapor deposition on soft substrates creates high-density stable glasses rapidly. This method enhances surface-mediated equilibration, achieving properties comparable to glasses aged for millions of years, significantly faster than traditional methods.

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Area of Science:

Materials Science
Physical Chemistry
Condensed Matter Physics

Background:

Physical vapor deposition (PVD) is a method for creating stable glasses.
Traditionally, PVD is performed on rigid substrates, requiring very slow deposition rates to achieve high densities.
Surface-mediated equilibration plays a key role in glass formation.

Purpose of the Study:

To investigate the effect of soft, rubbery substrates on PVD glass formation.
To determine if enhanced surface-mediated equilibration can accelerate the formation of high-density stable glasses.
To explore substrate elasticity as a means to control glass properties.

Main Methods:

Physical vapor deposition on soft, rubbery substrates with varying moduli.
Analysis of glass density and structure at different depths from the interface.
Comparison of deposition times and resulting glass properties with those obtained on rigid substrates.

Main Results:

Surface-mediated equilibration was enhanced up to 170 nm away from the interface on soft substrates.
Stable glasses with densities up to 2.5% higher than liquid-quenched glasses were formed within 2.5 hours.
Achieving similar glass densities on rigid substrates would necessitate deposition rates 10 million times slower (~3,000 years).
Substrate modulus directly controlled glass structure and density under constant deposition conditions.

Conclusions:

Soft, rubbery substrates significantly enhance PVD glass formation kinetics and density.
Substrate elasticity offers a powerful tool to control glass properties, enabling access to deeper energy states.
This approach bypasses the need for prohibitively slow deposition rates, opening new avenues for material design.