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Related Concept Videos

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 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 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,...
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...
Equipotential Surfaces and Field Lines01:29

Equipotential Surfaces and Field Lines

Electric potential can be pictorially represented as a three-dimensional surface. On such a surface, the electric potential is constant everywhere. The equipotential surface is always perpendicular to the electric field lines, and while it is three-dimensional, it can be treated as an equipotential line in a two-dimensional case. These equipotential lines are also always perpendicular to electric field lines. The term equipotential is often used as a noun, referring to an equipotential line or...
Equipotential Surfaces and Conductors01:16

Equipotential Surfaces and Conductors

For a conductor in which all charges are at rest, the conductor's surface is equipotential. The electric field is always perpendicular to equipotential surfaces. Therefore, in a conductor with static charges, the electric field just outside the conductor is always perpendicular to the conductor's surface. Any tangential component of the electric field will cause charges to move inside the conductor, which will violate the electrostatic nature of the system. In an electrostatic situation, if a...

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In Situ SIMS and IR Spectroscopy of Well-defined Surfaces Prepared by Soft Landing of Mass-selected Ions
10:22

In Situ SIMS and IR Spectroscopy of Well-defined Surfaces Prepared by Soft Landing of Mass-selected Ions

Published on: June 16, 2014

The Goldilocks surface.

Erwin A Vogler1

  • 1Departments of Materials Science and Engineering and Bioengineering, The Pennsylvania State University, University Park, PA 16802, USA. EAV3@PSU.EDU

Biomaterials
|June 21, 2011
PubMed
Summary
This summary is machine-generated.

The biological response to biomaterials is minimized at a specific surface energy, termed the Goldilocks Surface. This occurs because surface water molecules retain a chemical environment similar to bulk water, optimizing interactions.

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Area of Science:

  • Biomaterials Science
  • Surface Chemistry
  • Physical Chemistry

Background:

  • Biological responses to materials are sensitive to surface properties.
  • Surface energy plays a critical role in the interaction between materials and biological systems.
  • Understanding water's behavior at material interfaces is key to controlling biological responses.

Purpose of the Study:

  • To investigate the relationship between surface energy and biological response.
  • To elucidate the role of interfacial water properties in biomaterial interactions.
  • To define optimal surface characteristics for biomaterials.

Main Methods:

  • Calculated wetting energetics using established theories.
  • Estimated hydrogen bonding of water molecules at material surfaces.
  • Defined quantitative criteria for hydrophobic and hydrophilic surfaces.

Main Results:

  • A minimum biological response was observed within a narrow surface energy range (Goldilocks Surface).
  • Water molecules on Goldilocks Surfaces form a single hydrogen bond, retaining bulk-like properties.
  • Hydrophilic surfaces expend >1.3 kJ/mole-of-surface-sites for wetting; hydrophobic surfaces expend <1.3 kJ/mole-of-surface-sites.

Conclusions:

  • The Goldilocks Surface minimizes biological response by maintaining a bulk-like water environment.
  • Precise definitions for hydrophobic and hydrophilic surfaces in biomaterials were established based on wetting energetics.
  • Surface chemistry and interfacial water properties are critical determinants of biomaterial performance.