Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Reaction Rate02:53

Reaction Rate

66.1K
The rate of reaction is the change in the amount of a reactant or product per unit time. Reaction rates are therefore determined by measuring the time dependence of some property that can be related to reactant or product amounts. Rates of reactions that consume or produce gaseous substances, for example, are conveniently determined by measuring changes in volume or pressure.
The mathematical representation of the change in the concentration of reactants and products, over time, is the rate...
66.1K
Oscillations In An LC Circuit01:30

Oscillations In An LC Circuit

3.2K
An idealized LC circuit of zero resistance can oscillate without any source of emf by shifting the energy stored in the circuit between the electric and magnetic fields. In such an LC circuit, if the capacitor contains a charge q before the switch is closed, then all the energy of the circuit is initially stored in the electric field of the capacitor. This energy is given by
3.2K
Forced Oscillations01:06

Forced Oscillations

8.0K
When an oscillator is forced with a periodic driving force, the motion may seem chaotic. The motions of such oscillators are known as transients. After the transients die out, the oscillator reaches a steady state, where the motion is periodic, and the displacement is determined.
8.0K
Damped Oscillations01:07

Damped Oscillations

7.4K
In the real world, oscillations seldom follow true simple harmonic motion. A system that continues its motion indefinitely without losing its amplitude is termed undamped. However, friction of some sort usually dampens the motion, so it fades away or needs more force to continue. For example, a guitar string stops oscillating a few seconds after being plucked. Similarly, one must continually push a swing to keep a child swinging on a playground.
Although friction and other non-conservative...
7.4K
Limits with Oscillating Discontinuities01:19

Limits with Oscillating Discontinuities

492
An oscillating discontinuity is a type of discontinuity in which a function’s values fluctuate infinitely often as the input approaches a particular point. Unlike jump discontinuities, where the function suddenly shifts between two values, or infinite discontinuities, where the function diverges without bound, an oscillating discontinuity arises from rapid back-and-forth variation. Because the function never stabilizes toward a single value, no finite limit exists at that point.One of the...
492
Oscillations about an Equilibrium Position01:04

Oscillations about an Equilibrium Position

7.0K
Stability is an important concept in oscillation. If an equilibrium point is stable, a slight disturbance of an object that is initially at the stable equilibrium point will cause the object to oscillate around that point. For an unstable equilibrium point, if the object is disturbed slightly, it will not return to the equilibrium point. There are three conditions for equilibrium points—stable, unstable, and half-stable. A half-stable equilibrium point is also unstable, but is named so...
7.0K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Nature of ammonia storage sites in H-SSZ-13 and Cu-SSZ-13.

RSC advances·2026
Same author

Probing the structure of D<sub>2</sub>O ice layers on ALD-grown ZrO<sub>2</sub>, Al<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> thin films by sum frequency generation (SFG) spectroscopy.

Faraday discussions·2026
Same author

Platinum surface oxides govern the cathodic overpotential of the oxygen reduction reaction.

EES catalysis·2026
Same author

Grand Challenges and Opportunities in Stimulated Dynamic and Resonant Catalysis.

ACS catalysis·2026
Same author

Magnetic Properties of Ferritin at Different Levels of Degradation: Implications for MRI-Based Iron Quantification in the Brain.

Magnetic resonance in medicine·2025
Same author

Synergy of Oxygen and Water in Ceria-Catalyzed Direct Conversion of Methane to Methanol under Continuous Flow.

ACS catalysis·2025
Same journal

Interplay between oxygen redox and interfacial stability of Li-rich positive electrodes in sulfide-based all-solid-state batteries.

Nature communications·2026
Same journal

Breaking dependence on melanisation imparts diversity to a dogmatic invasion strategy of phytopathogenic fungi.

Nature communications·2026
Same journal

Hydroxyl-rich nanocavities on perovskite enable nearly barrierless intramolecular hydrogen transfer for nitrate electroreduction to ammonia.

Nature communications·2026
Same journal

Household mobility responses to weather extremes in Kyrgyzstan.

Nature communications·2026
Same journal

Autonomous Motion Vision with Tri-bulk-heterojunctioned Organic Adaptation Transistor.

Nature communications·2026
Same journal

Tissue-adhesive hydrogel optical fiber for peripheral optogenetic neuromodulation.

Nature communications·2026
See all related articles

Related Experiment Video

Updated: Feb 14, 2026

HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
11:15

HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

Published on: July 23, 2016

10.7K

Visualizing catalyst heterogeneity by a  multifrequential oscillating reaction.

Yuri Suchorski1, Martin Datler1, Ivan Bespalov1

  • 1Institute of Materials Chemistry, Technische Universität Wien, 1060, Vienna, Austria.

Nature Communications
|February 11, 2018
PubMed
Summary
This summary is machine-generated.

Researchers directly observed that different surface structures on rhodium exhibit unique oscillation patterns during hydrogen oxidation. This finding reveals surface heterogeneity and offers new insights into structure-sensitive heterogeneous catalysis.

More Related Videos

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
08:25

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs

Published on: January 17, 2020

7.8K
Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
10:39

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

Published on: August 23, 2018

8.3K

Related Experiment Videos

Last Updated: Feb 14, 2026

HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
11:15

HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

Published on: July 23, 2016

10.7K
Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs
08:25

Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks MOFs

Published on: January 17, 2020

7.8K
Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction
10:39

Heterogeneous Removal of Water-Soluble Ruthenium Olefin Metathesis Catalyst from Aqueous Media Via Host-Guest Interaction

Published on: August 23, 2018

8.3K

Area of Science:

  • Surface Science
  • Heterogeneous Catalysis
  • Materials Science

Background:

  • Catalytic properties of metals are known to depend on their surface structure.
  • Traditionally, structure-activity relationships are studied using well-defined single crystal surfaces.
  • Polycrystalline surfaces are complex and their heterogeneity under reaction conditions is challenging to observe directly.

Purpose of the Study:

  • To directly observe and characterize the heterogeneity of active polycrystalline surfaces during a catalytic reaction.
  • To investigate the influence of specific surface structures on catalytic behavior under reaction conditions.
  • To explore the mechanisms behind observed oscillatory phenomena in heterogeneous catalysis.

Main Methods:

  • In situ observation of hydrogen oxidation over rhodium using photoemission electron microscopy (PEEM).
  • Analysis of multifrequential oscillations and spiral patterns on different crystallographic domains.
  • Microkinetic modeling to support experimental findings and elucidate reaction mechanisms.

Main Results:

  • Direct visualization of heterogeneity on polycrystalline rhodium surfaces under reaction conditions.
  • Observation of distinct spiral patterns and unique oscillation frequencies for different µm-sized crystallographic domains.
  • Identification of subsurface oxygen formation on stepped surfaces as a key feedback mechanism for oscillations.

Conclusions:

  • Polycrystalline surfaces exhibit inherent structural heterogeneity that directly impacts catalytic behavior.
  • The observed oscillations are linked to specific surface structures and the formation of subsurface oxygen.
  • This study provides a new approach to understanding and addressing the structure-sensitivity of heterogeneous catalysts.