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Related Concept Videos

Colloids03:22

Colloids

18.8K
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...
18.8K
Colloidal precipitates01:09

Colloidal precipitates

1.6K
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...
1.6K
Colloids and Suspensions01:17

Colloids and Suspensions

2.5K
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...
2.5K
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

1.8K
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
1.8K
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

1.9K
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
1.9K
Coagulation01:06

Coagulation

490
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...
490

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Related Experiment Video

Updated: Oct 23, 2025

Generation of Size-controlled Poly ethylene Glycol Diacrylate Droplets via Semi-3-Dimensional Flow Focusing Microfluidic Devices
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Controllable dried patterns of colloidal drops.

Fan Du1, Liyuan Zhang1, Wei Shen1

  • 1Department of Chemical Engineering, Monash University, Wellington Rd, VIC 3800, Australia.

Journal of Colloid and Interface Science
|August 22, 2021
PubMed
Summary
This summary is machine-generated.

Controlling aqueous colloidal drop drying patterns is possible by manipulating drop shape and humidity. Pendant drops show stronger convection, creating distinct disc-like and spot-like patterns compared to sessile drops.

Keywords:
Capillary flowControllable dried patternsMarangoni flowNatural convectionPendant dropSuppressed coffee-ring effect

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Area of Science:

  • Colloid science
  • Fluid dynamics
  • Materials science

Background:

  • The drying patterns of colloidal drops on substrates are influenced by internal fluid flow.
  • Controlling these patterns is crucial for applications in materials deposition and fabrication.

Purpose of the Study:

  • To investigate a novel strategy for controlling the dried patterns of aqueous colloidal drops.
  • To understand the role of drop configuration and relative humidity in dictating internal flow and deposition patterns.

Main Methods:

  • Studied both sessile and pendant aqueous colloidal drops.
  • Varied relative humidity to influence capillary flow and suppress coffee-ring effects.
  • Analyzed the interplay between Marangoni and natural convection in different drop geometries.

Main Results:

  • Increased relative humidity suppressed coffee-ring formation.
  • Pendant drops exhibited significantly stronger internal convection than sessile drops.
  • Distinct disc-like (sessile) and spot-like (pendant) patterns formed due to opposing or reinforcing convective forces.

Conclusions:

  • Drop configuration and relative humidity are effective parameters for controlling colloidal drying patterns.
  • The interaction between Marangoni and natural convection dictates pattern formation.
  • This method offers a material- and force-free approach to pattern control.