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Related Concept Videos

Colloids03:22

Colloids

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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 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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In concrete, the pore size distribution significantly influences the material's properties. Capillary pores, markedly larger than gel pores, form a vast network within partially hydrated cement paste, reducing the concrete's strength and increasing its permeability. This heightened permeability leads to a greater risk of damage from environmental factors like freeze-thaw cycles and chemical attacks, with the extent of vulnerability also being tied to the water-to-cement ratio.
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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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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.
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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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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...
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Ordered non-close packed colloidal array with morphology control.

Madhumita Choudhuri1, Meneka Banik1, Rabibrata Mukherjee1

  • 1Instability & Soft Patterning Laboratory, Department of Chemical Engineering, Indian Institute of Technology Kharagpur, 721302, West Bengal, India. rabibrata@che.iitkgp.ac.in.

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Summary
This summary is machine-generated.

This study introduces a simple template-guided method to create ordered non-close packed (NCP) colloidal arrays. This technique bypasses complex methods, enabling applications in photonics and nano fabrication.

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Area of Science:

  • Colloid science
  • Materials science
  • Nanotechnology

Background:

  • Non-close packed (NCP) colloidal arrays are crucial for photonics and nano fabrication but difficult to produce.
  • Existing methods for NCP array fabrication are complex, involving plasma etching, electric fields, or precise particle manipulation.

Purpose of the Study:

  • To develop a facile template-guided approach for fabricating ordered NCP colloidal arrays.
  • To demonstrate control over NCP array morphology through template design and colloidal solution parameters.

Main Methods:

  • Soft lithography was used to create templates from hexagonal close packed (HCP) arrays of larger colloidal particles (LPs).
  • Smaller colloidal particles (SPs) were spin-coated onto these templates to form ordered NCP arrays.
  • Colloidal transfer printing using UVO was employed to transfer the NCP arrays onto various surfaces.

Main Results:

  • Ordered NCP arrays were successfully fabricated using the template-guided method.
  • NCP array morphology was tunable by altering template replication (single/double), SP concentration (Cn), and particle size ratios (ds/dL).
  • The fabricated NCP arrays demonstrated successful transfer to different substrates.

Conclusions:

  • The presented template-guided method offers a straightforward and versatile approach for NCP colloidal array fabrication.
  • This technique facilitates the integration of NCP arrays into diverse applications, including photonics and optical devices.
  • The ability to control morphology and transfer arrays expands their utility in nanotechnology and materials science.