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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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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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Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism

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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
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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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Qualitative Analysis03:46

Qualitative Analysis

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For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
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Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

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Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
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Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
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Salt-Induced Polymorphs Observed in Colloidal Single Crystals.

Soyoung E Seo1, Byeongdu Lee2, Taegon Oh3

  • 1Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States.

Journal of the American Chemical Society
|September 11, 2025
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Summary
This summary is machine-generated.

Researchers created different crystal structures (polymorphs) of gold nanoparticles using DNA engineering. Adjusting salt and temperature controlled these structures, revealing new ways to stabilize colloidal crystals with unique properties.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Crystallography

Background:

  • Polymorphs are solids with identical chemical composition but distinct crystal structures and physical properties.
  • These differing properties, including solubility and bioavailability, make polymorph control crucial in materials science.

Purpose of the Study:

  • To synthesize and characterize polymorphs of DNA-engineered colloidal crystals.
  • To investigate the influence of ionic strength and thermal processing on structural transitions in these colloidal crystals.

Main Methods:

  • Synthesis of gold nanoparticle-core programmable atom equivalents (PAEs) with DNA sequences.
  • Slow-cooling of PAEs under varying salt concentrations (0.5–4 M NaCl).
  • Analysis of resulting crystallographic structures (cubic, tetragonal, hexagonal).

Main Results:

  • Achieved diverse single-crystalline phases of colloidal crystals.
  • Demonstrated structural transitions driven by modulation of interparticle repulsion via ionic strength and temperature.
  • Observed diffusionless phase transformations from cubic to tetragonal lattices.
  • Captured metastable body-centered tetragonal structures, indicating control over low-symmetry phase crystallization.

Conclusions:

  • Thermal and ionic parameters can be precisely tuned to access and stabilize colloidal crystal polymorphs.
  • This control enables the creation of emergent structures with potentially interesting functional properties.
  • The study highlights a method for engineering complex colloidal matter with tunable physical characteristics.