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Related Concept Videos

Coupled Reactions01:17

Coupled Reactions

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Cellular processes such as building and breaking down complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are spontaneous and release energy, whereas others require energy to proceed. Cells often couple the energy-releasing reaction with the energy-requiring one to carry out important cell functions. 
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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
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The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
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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.
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Making a Simple A+B→C Reaction Oscillate by Coupling to Hydrodynamic Effect.

M A Budroni1,2, V Upadhyay1, L Rongy1

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Summary
This summary is machine-generated.

A simple chemical reaction can create oscillations and waves without feedback. The product drives fluid flows, causing damped oscillations in concentration and velocity fields.

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Area of Science:

  • Chemical kinetics
  • Fluid dynamics
  • Reaction-diffusion systems

Background:

  • Chemical oscillations typically require complex feedback loops or external triggers.
  • Understanding spontaneous pattern formation in chemical systems is a fundamental challenge.

Purpose of the Study:

  • To introduce a novel mechanism for inducing chemical oscillations and waves.
  • To identify the minimal conditions for spontaneous periodic behavior in a simple reaction-diffusion system.

Main Methods:

  • Numerical simulations of a reaction-diffusion model.
  • Analysis of coupled reaction-diffusion and convective Marangoni flows.
  • Characterization of oscillatory instability in parameter space.

Main Results:

  • A simple A+B→C reaction can induce spatiotemporal oscillations.
  • Product-driven Marangoni flows coupled with diffusion initiate periodic behavior.
  • Buoyancy convection antagonistically controls oscillation properties.

Conclusions:

  • Spontaneous chemical oscillations are achievable in simple systems via product-driven convection.
  • The interplay between Marangoni and buoyancy forces dictates oscillation dynamics.
  • This mechanism offers new insights into pattern formation in chemical reactions.