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Updated: May 6, 2026

Microfluidics in Assessing Platelet Function

Microfluidics in Assessing Platelet Function

Published on: November 8, 2024

Ultrahigh magnetically responsive microplatelets with tunable fluorescence emission.

Rafael Libanori¹, Frieder B Reusch, Randall M Erb

¹Complex Materials, Department of Materials, ETH Zurich , 8093 Zurich, Switzerland.

Langmuir : the ACS Journal of Surfaces and Colloids

|November 2, 2013

Summary

This summary is machine-generated.

Researchers developed magnetically tunable optical materials using silica-coated alumina microplatelets functionalized with fluorescent dyes. This method enhances optical properties without compromising transmittance, enabling new smart optical devices.

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Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Magnetic field control of particle orientation offers potential for tunable optical properties in displays and sensors.
High magnetic material concentrations often reduce optical transmittance, posing a challenge for such applications.

Purpose of the Study:

To develop a method for creating magnetically tunable optical properties in suspensions.
To overcome the optical transmittance limitations associated with traditional magnetic particle manipulation.

Main Methods:

Electrostatic adsorption of superparamagnetic iron oxide nanoparticles (SPIONs) onto alumina microplatelets to achieve tunable magnetic response.
Sol-gel deposition of a silica (SiO2) layer onto magnetized microplatelets using tetraethylorthosilicate (TEOS).
Covalent functionalization of the silica surface with an organic fluorescent dye via silane chemistry.

Main Results:

Ultrahigh magnetically responsive (UHMR) alumina microplatelets with tunable magnetic properties (15-36 G) were successfully prepared.
A continuous silica layer (20-50 nm) was uniformly deposited on the microplatelets.
The functionalized particles exhibited magnetically tunable optical properties, with controlled spatial and temporal fluorescence emission.

Conclusions:

The developed strategy enables the creation of multifunctional platelets with magnetically tunable optical properties.
This approach overcomes the trade-off between magnetic responsiveness and optical transmittance.
These engineered particles are promising building blocks for advanced colloid-based smart optical devices and sensors.