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Related Concept Videos

Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
Cohesion01:07

Cohesion

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.
On a surface,...
Surface Tension of Fluid01:22

Surface Tension of Fluid

Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies with...
Surface Tension01:24

Surface Tension

Surface tension is defined as the force per unit length (γ) acting along the surface of a liquid. It arises due to strong intermolecular forces of attraction. A molecule located inside the bulk of the liquid is surrounded by other molecules and experiences equal forces in all directions. However, a molecule at the surface experiences unbalanced forces because there are more neighboring molecules below than above. This creates a net inward force that pulls surface molecules toward the interior,...
Surface Tension and Surface Energy01:16

Surface Tension and Surface Energy

When a paint brush is immersed in water, the bristles wave freely inside the water. When it is taken out, the bristles stick together. The reason behind this effect is surface tension.
Consider a beaker filled with liquid. The bulk molecules in the liquid experience equal attractive forces on all sides with the surrounding molecules. However, the surface molecules experience a net attractive force downward due to the bulk molecules. The surface of the liquid behaves like a stretched membrane,...

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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
14:52

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

Published on: September 23, 2018

Water on graphene surfaces.

M C Gordillo1, J Martí

  • 1Departamento de Sistemas Físicos, Químicos y Naturales, Facultad de Ciencias Experimentales, Universidad Pablo de Olavide, Carretera de Utrera, km 1, E-41013 Sevilla, Spain. cgorbar@upo.es

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 15, 2011
PubMed
Summary
This summary is machine-generated.

Water behavior near graphene surfaces was studied using molecular dynamics simulations. Confinement significantly alters water

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Synthesis of Graphene Nanofluids with Controllable Flake Size Distributions
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Area of Science:

  • Computational chemistry
  • Materials science
  • Physical chemistry

Background:

  • Graphene and its derivatives are crucial in nanotechnology.
  • Understanding water-graphene interactions is key for applications.
  • Confined water exhibits unique properties compared to bulk water.

Purpose of the Study:

  • To investigate water behavior confined by graphene structures.
  • To analyze thermodynamical, structural, and dynamic properties.
  • To compare confined water properties with bulk water.

Main Methods:

  • Molecular dynamics simulations were employed.
  • Simulations covered various graphene confinements: nanotubes, slit pores, and sheets.
  • Key properties analyzed include binding energies, hydrogen-bond distributions, and infrared spectra.

Main Results:

  • Water exhibits distinct thermodynamical, structural, and dynamic behaviors when confined.
  • Binding energies, hydrogen-bond networks, and vibrational spectra differ from bulk water.
  • Graphene's influence on water properties is structure-dependent.

Conclusions:

  • Graphene surfaces significantly modify water's properties.
  • Simulations provide insights into water-nanomaterial interactions.
  • Findings are relevant for designing graphene-based devices and understanding interfacial phenomena.