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Related Concept Videos

Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion01:21

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion03:48

Behavior of Gas Molecules: Molecular Diffusion, Mean Free Path, and Effusion

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Although gaseous molecules travel at tremendous speeds (hundreds of meters per second), they collide with other gaseous molecules and travel in many different directions before reaching the desired target. At room temperature, a gaseous molecule will experience billions of collisions per second. The mean free path is the average distance a molecule travels between collisions. The mean free path increases with decreasing pressure; in general, the mean free path for a gaseous molecule will be...
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Problem-Solving: Tuning of a Guitar String01:04

Problem-Solving: Tuning of a Guitar String

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In the case of stringed instruments like the guitar, the elastic property that determines the speed of the sound produced is its linear mass density or the mass per unit length. This is simply called the linear density. If the string's linear density is constant along the string, then the linear density is simply the total mass divided by the total length.
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Facilitated Diffusion01:16

Facilitated Diffusion

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The plasma membrane, a critical structure in cellular biology, houses an array of transporters, or carrier proteins, interspersed within its lipid bilayer. These proteins play a crucial role in solute transport through facilitated diffusion, a form of passive diffusion that uses transporters to move the molecules across the membrane.
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Thermal Strain01:19

Thermal Strain

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Thermal strain is a concept that arises when we consider how temperature changes affect structures. Unlike the conventional assumption that structures remain constant under load, real-world scenarios often involve temperature fluctuations that can significantly impact these structures. Consider a homogeneous rod with a uniform cross-section resting freely on a flat horizontal surface. If the rod's temperature increases, the rod elongates. This elongation is proportional to the temperature...
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Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
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Tuning Oxygen Vacancy Diffusion through Strain in SrTiO3 Thin Films.

Lucia Iglesias1, Andrés Gómez2, Martí Gich2

  • 1Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CIQUS), Departamento de Química-Física , Universidade de Santiago de Compostela , 15782 Santiago de Compostela , Spain.

ACS Applied Materials & Interfaces
|September 26, 2018
PubMed
Summary

Strain significantly enhances oxygen vacancy diffusion in strontium titanate (SrTiO3) thin films at room temperature. This finding is key for developing advanced ion-based electronic devices and improving catalytic applications.

Keywords:
Kelvin probe force microscopydiffusion coefficientelectrostatic force microscopyoxygen vacanciesresistive switchingstrain engineeringstrontium titanate

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid-State Chemistry

Background:

  • Oxygen vacancies in oxides are critical for ion-based electronics and catalysis.
  • Controlling vacancy diffusion is essential for device performance and stability.
  • Epitaxial strain is a potential external stimulus to modulate material properties.

Purpose of the Study:

  • To investigate the diffusion of oxygen vacancies in SrTiO3 thin films.
  • To understand the effect of external stimuli, specifically epitaxial strain and electric fields, on vacancy diffusion.
  • To determine the influence of parameters like tip bias, pulse time, and temperature on local vacancy concentration.

Main Methods:

  • Utilized an atomic force microscopy (AFM) tip to apply an external electric field.
  • Measured the room-temperature diffusion coefficient of oxygen vacancies in SrTiO3 thin films.
  • Applied compressive and tensile epitaxial strain to the SrTiO3 films.
  • Investigated the impact of tip bias, pulse time, and temperature on local vacancy concentration.

Main Results:

  • Tensile epitaxial strain substantially increased the oxygen vacancy diffusion coefficient in SrTiO3.
  • Facilitated mobility of oxygen vacancies through the thin film under tensile strain.
  • Identified tip bias, pulse time, and temperature as controllable parameters for local vacancy concentration.

Conclusions:

  • Strain plays a pivotal role in controlling oxygen vacancy migration in thin-film oxides.
  • The findings offer insights for the design and stabilization of nonvolatile states in ion-based devices.
  • Room-temperature control of vacancy diffusion opens avenues for novel oxide electronics and catalysis.