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Coagulation

Coagulation

Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...

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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...

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...

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Related Experiment Video

Updated: Aug 3, 2025

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles

Published on: March 13, 2016

Naturally derived colloidal rods in microfluidic flows.

Vincenzo Calabrese¹, Amy Q Shen¹, Simon J Haward¹

¹Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan.

Biomicrofluidics

|April 10, 2023

Summary

This summary is machine-generated.

Naturally derived colloidal rods (CR) are key for sustainable materials. Understanding CR structural dynamics in microfluidic flows is crucial for material design and data interpretation.

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Millifluidics for Chemical Synthesis and Time-resolved Mechanistic Studies

Millifluidics for Chemical Synthesis and Time-resolved Mechanistic Studies

Published on: November 27, 2013

Area of Science:

Soft Matter Science
Materials Engineering
Fluid Dynamics

Background:

Naturally derived colloidal rods (CR) are essential building blocks for sustainable soft materials.
Understanding CR behavior in dispersion under processing conditions is vital for material development.
Microfluidic platforms offer advanced methods to study CR structural dynamics under flow.

Purpose of the Study:

To analyze recent findings on naturally derived CR and rod-like macromolecules in microfluidic flows.
To emphasize the dynamical behavior of CR in shear- and extensional-dominated flows.
To provide key concepts for evaluating CR and microfluidic platform results and fostering interdisciplinary connections.

Main Methods:

Review and analysis of recent experimental results from microfluidic studies.
Focus on dynamical behavior under various flow conditions (shear and extensional).
Comparative evaluation of different microfluidic platform designs and their suitability for CR research.

Main Results:

CR exhibit complex structural dynamics under microfluidic flow conditions.
Flow type (shear vs. extensional) significantly influences CR behavior and self-assembly.
Different microfluidic platforms yield unique insights but require careful interpretation.

Conclusions:

A comprehensive understanding of CR dynamics in microfluidic flows is essential for designing novel soft materials.
Careful evaluation of microfluidic techniques is necessary for accurate data interpretation and interdisciplinary application.
Future research should focus on refining microfluidic approaches and exploring new CR applications.