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Related Concept Videos

Hydrogen Bonds01:04

Hydrogen Bonds

A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
Hydrogen Bonds00:26

Hydrogen Bonds

Hydrogen BondsHydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.Hydrogen Bonds Control the World!Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are...
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

Noncovalent attractions are associations within and between molecules that influence the shape and structural stability of complexes. These interactions differ from covalent bonding in that they do not involve sharing of electrons.
Four types of noncovalent interactions are hydrogen bonds, van der Waals forces, ionic bonds, and hydrophobic interactions.
Hydrogen bonding results from the electrostatic attraction of a hydrogen atom covalently bonded to a strong-electronegative atom like oxygen,...
Radical Formation: Homolysis00:54

Radical Formation: Homolysis

A bond is formed between two atoms by sharing two electrons. When this bond is broken by supplying sufficient energy, either two electrons can be taken up by one atom forming ions by the cleavage called heterolysis, or the two electrons are shared by two atoms, with one each creating radicals by the cleavage called homolysis.

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Updated: Jun 10, 2026

Synthesis and Characterization of Supramolecular Colloids
09:26

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Hydrogen-bond-induced heteroassembly in binary colloidal systems.

Frank M Bayer1, Karl Hiltrop, Klaus Huber

  • 1Department of Chemistry, Physical Chemistry, University of Paderborn, Warburger Strasse 100, 33098 Paderborn, Germany.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 31, 2010
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel binary colloidal system using polystyrene colloids with complementary hydrogen-bonding groups. This system enables controlled heteroaggregation and shows potential for ordered binary assembly.

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Synthesis and Characterization of Supramolecular Colloids
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Area of Science:

  • Colloid and Surface Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Designing binary colloidal systems with specific interactions is crucial for advanced materials.
  • Polystyrene colloids offer a versatile platform for functionalization.
  • Hydrogen bonding provides a specific and reversible interaction mechanism.

Purpose of the Study:

  • To design and characterize a binary colloidal system with exclusive interactions between components.
  • To investigate the self-assembly behavior of these functionalized colloids.
  • To explore the potential for ordered binary assembly through controlled aggregation.

Main Methods:

  • Surfactant-free emulsion polymerization of cross-linked polystyrene with 4-hydroxyl styrene or 4-vinyl pyridine.
  • Characterization using light scattering and infrared (IR) spectroscopy.
  • Time-resolved static light scattering to study aggregation kinetics.

Main Results:

  • Colloids with radii between 130-270 nm and narrow size distributions were synthesized.
  • Strong hydrogen bonds were confirmed between phenolic and pyridine functionalities.
  • Fast heteroaggregation was observed in CHCl(3), controllable by dilution or capping agents.

Conclusions:

  • A novel binary colloidal system with specific H-bonding interactions was successfully created.
  • Controlled heteroaggregation and potential for ordered binary assembly were demonstrated.
  • The system offers a pathway for designing complex colloidal structures.