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Related Concept Videos

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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Sieve Analysis and Grading Curves01:19

Sieve Analysis and Grading Curves

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Sieve analysis is a method used to determine the particle size distribution of aggregate materials. This process involves the following steps:
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Filtration00:53

Filtration

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Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
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Colloidal precipitates01:09

Colloidal precipitates

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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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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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Precipitation Gravimetry01:03

Precipitation Gravimetry

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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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Capillary-based Centrifugal Microfluidic Device for Size-controllable Formation of Monodisperse Microdroplets
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Condensation droplet sieve.

Chen Ma1,2, Li Chen3,4, Lin Wang3,4,5

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Researchers developed a condensation droplet sieve using microscale lattices coated with a superhydrophobic layer. This innovative surface spontaneously detaches large droplets, enhancing anti-fogging and heat transfer properties.

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Area of Science:

  • Materials Science
  • Surface Science
  • Nanotechnology

Background:

  • Large droplets during condensation degrade surface functions like anti-fogging and heat transfer.
  • Controlling droplet size and spontaneous detachment remains a significant challenge.

Purpose of the Study:

  • To develop a novel strategy for spontaneous droplet detachment from condensing surfaces.
  • To investigate a method for controlling droplet size and volume.

Main Methods:

  • Fabrication of microscale thin-walled lattice structures.
  • Coating the structures with a superhydrophobic layer.
  • Observing droplet behavior during condensation.

Main Results:

  • Droplets spontaneously detached upon exceeding lattice size.
  • Maximum droplet radius was confined to 16 μm.
  • Residual droplet volume was limited to 3.2 nl/mm².
  • Droplet detachment attributed to coalescence mismatch tolerance and inter-lattice isolation.

Conclusions:

  • The condensation droplet sieve effectively controls droplet size and promotes spontaneous detachment.
  • This strategy offers a pathway for designing high-performance anti-dew materials.
  • The findings have implications for improving surface properties in various applications.