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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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The self is a central aspect of human identity, encompassing an individual’s beliefs, emotions, perceptions, and experiences. It is a cognitive and psychological construct that enables individuals to interpret their traits and behaviors, influencing how they perceive themselves and interact with the world. While personality consists of stable and enduring characteristics, the self is shaped by self-perception and social experiences. This distinction highlights the dynamic nature of the...
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Deception is a pervasive aspect of human communication. Empirical studies have shown that most individuals engage in some form of deceit on a daily basis, with approximately 20% of social exchanges involving deceptive elements. Lying follows a developmental trajectory, peaking during adolescence and declining with age, possibly due to the maturation of cognitive control and social accountability.Cognitive and Social Factors in Deception DetectionDespite its prevalence, accurately detecting...
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Love, as a multifaceted psychological construct, encompasses emotions, cognitive processes, and behavioral patterns that play a crucial role in human relationships. It extends beyond attraction, manifesting in deep, enduring connections that influence personal well-being and social structures.Psychological Dimensions of LoveLove differs from friendship and mere liking through its depth and intensity. While friendship is built on mutual respect, trust, and companionship, love involves emotional...
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Related Experiment Video

Updated: Feb 2, 2026

Chemical Dimerization-Induced Protein Condensates on Telomeres
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Chemical Dimerization-Induced Protein Condensates on Telomeres

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Understanding the Enhancement of Surface Diffusivity by Dimerization.

C Zaum1, K Morgenstern2

  • 1Leibniz Universität Hannover, ATMOS, Appelstrasse 2, D-30167 Hannover, Germany.

Physical Review Letters
|November 17, 2018
PubMed
Summary
This summary is machine-generated.

Molecular dimers exhibit enhanced mobility on silver surfaces. Separating diffusion and rotation reveals rotational motion drives this enhanced dimer diffusivity, impacting material transport.

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Area of Science:

  • Surface science
  • Physical chemistry
  • Materials science

Background:

  • Collective molecular diffusion can enhance material transport.
  • Understanding molecular motion on surfaces is crucial for catalysis and nanotechnology.

Purpose of the Study:

  • To investigate the enhanced mobility of carbon monoxide (CO) dimers on silver surfaces.
  • To differentiate between diffusion and rotational motion of CO dimers.
  • To determine the activation energies for dimer diffusion and rotation.

Main Methods:

  • Time-lapsed scanning tunneling microscopy (STM) at low temperatures (15-25 K).
  • Studying CO dimers on elemental Ag(100) and a dilute Cu-Ag(100) alloy.
  • Kinetic analysis to determine activation energies.

Main Results:

  • Dimer diffusion on Ag(100) has a lower activation energy (40±2 meV) than monomer diffusion (72±1 meV).
  • Copper atoms in the alloy reduce dimer mobility, enabling separate measurement of rotational barrier (39±3 meV).
  • Rotational motion is identified as the primary factor for enhanced dimer diffusivity.

Conclusions:

  • The study successfully disentangles diffusion and rotation of CO dimers on Ag(100).
  • Rotational motion significantly contributes to the enhanced mobility of molecular dimers.
  • Findings provide insights into collective molecular transport mechanisms on surfaces.