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Noncovalent Attractions in Biomolecules02:35

Noncovalent Attractions in Biomolecules

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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,...
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Cohesion01:07

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Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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Adhesion01:14

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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
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Hydrogen Bonds00:26

Hydrogen Bonds

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Hydrogen 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.
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Adhesive Coacervates Driven by Hydrogen-Bonding Interaction.

Qiongyao Peng1, Jingsi Chen1, Zicheng Zeng2

  • 1Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada.

Small (Weinheim an Der Bergstrasse, Germany)
|October 2, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel adhesive coacervate using hydrogen bonding, not electrostatic forces. This new material is paintable underwater, adheres strongly, and shows promise as a hemostatic agent and for tissue engineering applications.

Keywords:
adhesive coacervatesantimicrobial propertiescoacervationhydrogen bondingwet adhesion

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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Polymer Chemistry

Background:

  • Coacervation is crucial for biological processes like tissue construction and marine organism adhesion.
  • Conventional coacervation relies on electrostatic attraction between oppositely charged polyelectrolytes in aqueous solutions.

Purpose of the Study:

  • To develop a novel adhesive coacervate system driven by non-electrostatic interactions.
  • To explore coacervates formed from nonionic systems for advanced material applications.

Main Methods:

  • Mixing silicotungstic acid with nonionic polyethylene glycol in water to induce coacervation via hydrogen bonding.
  • Evaluating the coacervate's properties, including underwater paintability, adhesion to various substrates, and hemostatic efficacy.
  • Assessing hemolytic activity and antimicrobial properties of the developed coacervate.

Main Results:

  • A novel coacervate was successfully formed using hydrogen-bonding interactions between silicotungstic acid and polyethylene glycol.
  • The coacervate exhibited excellent underwater paintability and strong adhesion to diverse substrates.
  • The material demonstrated effective hemostatic properties for organ injury treatment without hemolytic activity and possessed inherent antimicrobial capabilities.

Conclusions:

  • Coacervation can be achieved in salt-free conditions through non-electrostatic interactions, expanding coacervate formation possibilities.
  • This hydrogen-bonding driven coacervate offers a versatile platform for engineering multifunctional biomaterials.
  • Potential applications include advanced tissue glues, wound dressings, and novel membrane-free cell systems.