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Related Concept Videos

Colloidal precipitates01:09

Colloidal precipitates

653
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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Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

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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...
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Precipitation Processes01:12

Precipitation Processes

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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

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Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
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Microcracking in Concrete01:20

Microcracking in Concrete

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Microcracking in concrete refers to the tiny cracks that can form within the material even before any external load is applied. These microcracks typically occur at the interface between the coarse aggregate and the hydrated cement paste, often as a result of differential volume changes prompted by variations in stress-strain behavior, as well as thermal and moisture movement. Initially, these microcracks remain stable and do not grow substantially until the concrete is stressed to about 30...
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Types of Coprecipitation01:10

Types of Coprecipitation

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Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
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Inhibiting Cracks in Latte Droplets.

Mohadese Beigtan1, Yohan Hwang2, Byung Mook Weon1,3

  • 1Soft Matter Physics Laboratory, School of Advanced Materials Science and Engineering, SKKU Advanced Institute of Nanotechnology (SAINT), Sungkyunkwan University, Suwon 16419, South Korea.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 7, 2023
PubMed
Summary
This summary is machine-generated.

Researchers studied latte droplet evaporation, finding milk

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Area of Science:

  • Fluid dynamics
  • Biomaterials science
  • Surface chemistry

Background:

  • Evaporation of complex fluids like latte leaves intricate deposit patterns.
  • Understanding biofluid dynamics is crucial due to their widespread applications.
  • The precise mechanisms controlling crack formation in deposits are not fully understood.

Purpose of the Study:

  • To investigate the evaporation and deposition dynamics of latte droplets.
  • To identify factors influencing crack development and inhibition in droplet deposits.
  • To understand the role of milk's properties in deposit pattern formation.

Main Methods:

  • Observing latte droplet evaporation.
  • Analyzing deposit patterns, focusing on crack formation.
  • Investigating the chemical and physical interactions within the coffee-milk mixture.

Main Results:

  • Milk's surfactant-like properties and interactions with coffee particles prevent crack formation.
  • Uniform, crack-free deposits are achievable in coffee-milk mixtures.
  • Specific intermolecular interactions are key to homogeneous deposition.

Conclusions:

  • The composition of milk significantly influences the evaporation and deposition of latte.
  • Understanding these dynamics enhances knowledge of complex biofluid pattern formation.
  • Findings suggest potential applications for bioinks with improved printability and biocompatibility.