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Related Concept Videos

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 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,...
Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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...
The First Law of Thermodynamics01:13

The First Law of Thermodynamics

The first law of thermodynamics deals with the total amount of energy in the universe. It states that this total amount of energy is constant. In other words, there has always been, and always will be, exactly the same amount of energy in the universe. Energy exists in many different forms. According to the first law of thermodynamics, energy may transfer from place to place or transform into different forms, but it cannot be created or destroyed. The transfers and transformations of energy...
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...

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Related Experiment Video

Updated: Jun 12, 2026

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
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Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light

Published on: September 12, 2014

Surface tension mediated conversion of light to work.

David Okawa1, Stefan J Pastine, Alex Zettl

  • 1College of Chemistry, University of California Berkeley, Berkeley, California 94720, USA.

Journal of the American Chemical Society
|June 22, 2010
PubMed
Summary

This study introduces a novel system that converts sunlight into mechanical motion on liquid surfaces. The technology uses focused light on nanostructured materials to generate movement, offering a new way to harness solar energy for work.

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Last Updated: Jun 12, 2026

Integrating a Triplet-triplet Annihilation Up-conversion System to Enhance Dye-sensitized Solar Cell Response to Sub-bandgap Light
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Harvesting

Background:

  • Increasing global energy demands necessitate innovative energy collection and utilization methods.
  • Existing energy systems often involve complex conversion steps, leading to inefficiencies.

Purpose of the Study:

  • To present a novel system that directly converts solar energy into mechanical work (locomotion).
  • To demonstrate the feasibility of using light-induced thermal gradients for controlled motion.

Main Methods:

  • Utilizing a nanostructured composite material to absorb focused sunlight.
  • Creating localized thermal gradients on a liquid surface via light absorption.
  • Leveraging surface tension gradients to induce object motion.

Main Results:

  • Demonstrated controlled linear and rotational motion of objects on liquids.
  • Showcased scale independence, with successful motion for objects from milligram to tens of grams.
  • Confirmed remote powering and control of the motion.

Conclusions:

  • The developed system offers a direct pathway for solar energy utilization through light-driven locomotion.
  • The technology is versatile and scalable, with potential applications in micro-robotics and remote manipulation.
  • This approach represents a significant advancement in direct solar energy conversion for mechanical tasks.