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Colloids

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

Colloids and Suspensions

Colloids and Suspensions

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...

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Related Experiment Video

Updated: Jun 19, 2025

Swimming Performance Assessment in Fishes

Swimming Performance Assessment in Fishes

Published on: May 20, 2011

All-Aqueous Soft Milli-swimmers.

Chunmei Zhou^1,2, Xin Tang^1,2, Rui Shi³

¹Center for Complex Flows and Soft Matter Research, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.

ACS Applied Materials & Interfaces

|July 23, 2024

Summary

This summary is machine-generated.

Researchers developed all-aqueous soft milli-swimmers using biodegradable hydrogels and biocompatible fuels. These eco-friendly micro-swimmers offer controllable propulsion for applications like drug delivery and environmental remediation.

Keywords:

all-aqueous system biocompatibility hydrogel self-propulsion soft milli-swimmers

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SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy

SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy

Published on: August 24, 2016

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Last Updated: Jun 19, 2025

Swimming Performance Assessment in Fishes

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Published on: May 20, 2011

Simple Microfluidic Devices for in vivo Imaging of C. elegans, Drosophila and Zebrafish

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Published on: September 30, 2012

SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy

SNARE-mediated Fusion of Single Proteoliposomes with Tethered Supported Bilayers in a Microfluidic Flow Cell Monitored by Polarized TIRF Microscopy

Published on: August 24, 2016

Area of Science:

Soft robotics and microfluidics
Biomaterials and nanotechnology

Background:

Microscale swimmers are promising for drug delivery, microsurgery, and environmental remediation.
Existing chemical swimmers face challenges: complex fabrication, high cost, toxic solvents, poor performance, and lack of control.
Marangoni-based swimmers are attractive due to their independence from external energy sources.

Purpose of the Study:

To develop an innovative approach for all-aqueous soft milli-swimmers.
To overcome limitations of existing micro-swimmers by using biodegradable hydrogels and biocompatible fuels.
To enable efficient fabrication and versatile applications in complex aqueous environments.

Main Methods:

Fabrication of swimmer bodies and fuel loading in a single step by dripping aqueous solutions.
Utilizing biodegradable hydrogels and biocompatible fuels for all-aqueous milli-swimmers.
Controlling swimmer dimensions, morphology, and velocity, including isotropic and anisotropic forms.

Main Results:

Demonstrated rove beetle-like self-propulsion on liquid surfaces using stored low-surface-energy compounds.
Achieved precise control over swimmer characteristics and movement.
Showcased adaptability in complex environments like engineered channels, labyrinths, and dynamic interfaces, including collective self-assemblies.

Conclusions:

The proposed method offers a simple, cost-effective, and eco-friendly approach to producing all-aqueous soft milli-swimmers.
These swimmers exhibit controllable, efficient propulsion and adaptability in diverse aqueous settings.
Integration with nanoparticles enables multifunctionality for cargo transport, sensing, and environmental remediation.