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Hydrogen Bonds00:26

Hydrogen Bonds

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.
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 unequally shared.
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...
Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

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Related Experiment Video

Updated: May 31, 2026

Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies
10:23

Synthesis and Functionalization of 3D Nano-graphene Materials: Graphene Aerogels and Graphene Macro Assemblies

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Hydrogen storage inside graphene-oxide frameworks.

Yue Chan1, James M Hill

  • 1Nanomechanics Group, School of Mathematical Sciences, The University of Adelaide, Adelaide, SA 5005, Australia. yue.chan@adelaide.edu.au

Nanotechnology
|July 2, 2011
PubMed
Summary
This summary is machine-generated.

This study models hydrogen storage in graphene-oxide frameworks (GOFs). GOF-28 shows high potential for practical hydrogen storage due to enhanced binding energy from its benzenediboronic acid pillars.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Applied Mathematics

Background:

  • Hydrogen storage is crucial for clean energy technologies.
  • Graphene-oxide frameworks (GOFs) offer potential for gas storage applications.
  • Understanding hydrogen uptake in GOFs requires accurate theoretical modeling.

Purpose of the Study:

  • To investigate hydrogen molecule storage within graphene-oxide frameworks.
  • To calculate hydrogen uptake using applied mathematical modeling and equations of state.
  • To identify promising GOF structures for practical hydrogen storage.

Main Methods:

  • Applied mathematical modeling.
  • Continuous approximation and equation of state for gas phases.
  • Validation against existing theoretical and computational results for parallel graphene sheets.

Main Results:

  • Model validated against existing data for parallel graphene sheets (1.85 wt% vs. 2 wt%).
  • Calculated hydrogen uptake for GOF-120, GOF-66, GOF-28, and GOF-6 as 1.68, 2, 6.33, and 0 wt%, respectively.
  • GOF-28 exhibits significantly higher hydrogen storage capacity attributed to benzenediboronic acid pillars enhancing binding energy.

Conclusions:

  • GOF-28 demonstrates superior hydrogen storage capacity compared to other studied frameworks.
  • The binding energy provided by specific ligands (benzenediboronic acid) is key to high hydrogen uptake.
  • GOF-28 is identified as a strong candidate for practical hydrogen storage applications.