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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...

Colloidal precipitates

Colloidal precipitates

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...

Drug Absorption: Factors Affecting GI Absorption

Drug Absorption: Factors Affecting GI Absorption

The process of oral drug absorption can be influenced by several factors. Weakly acidic drugs tend to be absorbed more readily from the stomach due to their nonionized state. However, absorption may be less efficient in the upper intestine, where drugs are often ionized. Interestingly, despite the stomach's apparent advantage for drug absorption, its mucous layer can hinder diffusion. Its surface area is also smaller than the intestine's, which can further slow down the absorption rate.

Carbohydrate Absorption

Carbohydrate Absorption

Carbohydrates are essential macronutrients that serve as the body's primary energy source. Their digestion begins in the mouth, where salivary amylase partially breaks down complex carbohydrates such as starch into smaller oligosaccharides. This mechanical and enzymatic activity prepares carbohydrates for further processing in the gastrointestinal tract.
After being swallowed, the partially digested carbohydrates mix with gastric secretions in the stomach. However, the acidic environment...

Absorption of Nutrients

Absorption of Nutrients

Absorption refers to taking dietary nutrients from the intestinal lumen for transportation throughout the body. After digestion in the small intestine, carbohydrates, proteins, and fats are broken down into simpler forms. These essential macronutrients and other vital substances, such as vitamins, minerals, and water, are then prepared for absorption into the bloodstream.
Enterocytes, which are specialized polar epithelial cells, line the mucosa of the small intestinal walls. These cells...

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Related Experiment Video

Updated: Jan 27, 2026

Methodology to Test Control Agents and Insecticides Against the Coffee Berry Borer Hypothenemus hampei

Methodology to Test Control Agents and Insecticides Against the Coffee Berry Borer Hypothenemus hampei

Published on: March 23, 2022

Coffee-based colloids for direct solar absorption.

Matteo Alberghini¹, Matteo Morciano¹, Luca Bergamasco¹

¹Department of Energy, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129, Torino, Italy.

Scientific Reports

|March 20, 2019

Summary

This summary is machine-generated.

A novel, eco-friendly coffee-based nanocolloid offers a sustainable alternative for direct solar absorption. This biocompatible fluid demonstrates comparable photo-thermal performance to traditional collectors, promoting greener solar energy solutions.

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Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Area of Science:

Materials Science
Renewable Energy
Nanotechnology

Background:

Carbon-based nanocolloids show promise for solar absorption but raise environmental and toxicity concerns.
Traditional solar collectors often rely on highly-absorbing surfaces, limiting volumetric absorption potential.

Purpose of the Study:

To synthesize and investigate the photo-thermal properties of a sustainable, biocompatible, and inexpensive coffee-based colloid.
To evaluate the performance of this novel colloid for direct solar absorption applications.
To compare its efficiency against traditional flat-plate collectors.

Main Methods:

Synthesis of a coffee-based colloid using distilled water, Arabica coffee, glycerol, and copper sulphate.
Photo-thermal performance analysis of the colloid at various dilutions under field conditions.
Utilized tailor-made, 3D-printed collectors for experimental testing.
Validated experimental results with two distinct theoretical models.

Main Results:

The coffee-based colloid exhibited enhanced photo-thermal properties and biocompatibility.
Volumetric absorption performance using the coffee colloid was comparable to classical surface-absorption systems.
Experimental data aligned well with proposed theoretical models.

Conclusions:

The developed coffee-based colloid presents a viable, sustainable, and cost-effective alternative for direct solar absorption.
These findings encourage further research into simple, biocompatible colloids for enhanced solar energy capture.
The study highlights the potential of natural materials in advancing renewable energy technologies.