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Fabrication, Densification, and Replica Molding of 3D Carbon Nanotube Microstructures

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Controlling the shape of 3D microstructures by temperature and light.

Marc Hippler^1,2, Eva Blasco³, Jingyuan Qu^2,4

¹Zoologisches Institut, Zell- und Neurobiologie, Karlsruhe Institute of Technology (KIT), Fritz-Haber-Weg 4, 76131, Karlsruhe, Germany.

Nature Communications

|January 18, 2019

Summary

Researchers created adaptable 3D microstructures using poly(N-isopropylacrylamide) (pNIPAM). These stimuli-responsive materials enable complex actuation for soft robotics and biosciences by altering material properties with laser exposure.

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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Published on: August 2, 2012

Area of Science:

Soft robotics
Materials science
Polymer science

Background:

Stimuli-responsive microstructures are essential for adaptable systems in soft robotics and biosciences.
Materials must be water-compatible and manufacturable in 3D.
Poly(N-isopropylacrylamide) (pNIPAM) is a known temperature-responsive polymer.

Purpose of the Study:

To introduce functional 3D hetero-microstructures based on pNIPAM.
To demonstrate control over material parameters within a single formulation using 3D laser lithography.
To achieve complex, large-amplitude actuation responses in sophisticated architectures.

Main Methods:

Utilized 3D laser lithography to vary local exposure dose.
Fabricated pNIPAM-based hetero-microstructures.
Employed numerical calculations to predict actuation response.
Induced local temperature increases via two-photon absorption for spatially controlled actuation.

Main Results:

Demonstrated on-demand alteration of material parameters within a single pNIPAM resist formulation.
Created sophisticated 3D architectures with complex and large-amplitude actuation.
Experimental results aligned with numerical predictions of actuation behavior.
Achieved spatially controlled responses through localized heating via two-photon absorption.

Conclusions:

Functional 3D hetero-microstructures based on pNIPAM can be fabricated with tunable properties.
This approach allows for the design of complex stimuli-responsive systems for advanced applications.
The combination of laser lithography and pNIPAM offers precise control over microstructural behavior.