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Artificial Molecular Machines.

Erbas-Cakmak S, Leigh DA, McTernan CT, Nussbaumer AL - Chem. Rev. (2015)

View Article: PubMed Central - PubMed

Affiliation: School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.

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bonded molecules and on catenanes and rotaxanes in which switching of other protic solvents... This effect (listed in descending binding ability) stations on the thread, macrocycle In these systems, fast-responding reporters are preferred... practical applications by utilizing molecular scale changes to create macroscopic effects... The thread of these rotaxanes included an anthracene fluorophore similar application in synthetic polymers often furnishes a useful result... of Brownian motion can be exploited to great effect in the synthesis every aspect of functional molecule and materials design... An improved robotics” in which ratcheted motions of molecular components

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A temperature or diffusionratchet. (a) The particles are locatedin an energy minima on the potential-energy surface, with energy barriers≫kBT1. (b) The temperature is increased so that the height of the barriersis ≪kBT2, and free diffusion is allowed to occur for a short time. (c) Asthe temperature is lowered again, the asymmetric potential energysurface means that the particles have a greater probability of beingtrapped to the right of their initial position. (d) Relaxation tothe local energy minima.128
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fig5: A temperature or diffusionratchet. (a) The particles are locatedin an energy minima on the potential-energy surface, with energy barriers≫kBT1. (b) The temperature is increased so that the height of the barriersis ≪kBT2, and free diffusion is allowed to occur for a short time. (c) Asthe temperature is lowered again, the asymmetric potential energysurface means that the particles have a greater probability of beingtrapped to the right of their initial position. (d) Relaxation tothe local energy minima.128

Mentions: In a tilting ratchet,the underlying potential energy surface remains unchanged, and detailedbalance is broken by the application of an unbiased driving forceto the particles, such as heat.128 Whenthe applied force is heat, the ratchets are also referred to as temperatureor diffusion ratchets (Figure 5). In its simplest form, the mechanism is very similar tothat of the on–off ratchet. Here, particles cannot cross theenergy maxima at low temperature, but a brief increase in temperatureallows the diffusion of particles across the surface. A lowering oftemperature traps this movement in a manner similar to the on–offpulsating ratchet leading to directional transport. The period ofraised temperature must be brief to prevent general diffusion, whichwould destroy any directionality initially gained.


Artificial Molecular Machines.

Erbas-Cakmak S, Leigh DA, McTernan CT, Nussbaumer AL - Chem. Rev. (2015)

A temperature or diffusionratchet. (a) The particles are locatedin an energy minima on the potential-energy surface, with energy barriers≫kBT1. (b) The temperature is increased so that the height of the barriersis ≪kBT2, and free diffusion is allowed to occur for a short time. (c) Asthe temperature is lowered again, the asymmetric potential energysurface means that the particles have a greater probability of beingtrapped to the right of their initial position. (d) Relaxation tothe local energy minima.128
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Related In: Results  -  Collection

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getmorefigures.php?uid=PMC4585175&req=5

fig5: A temperature or diffusionratchet. (a) The particles are locatedin an energy minima on the potential-energy surface, with energy barriers≫kBT1. (b) The temperature is increased so that the height of the barriersis ≪kBT2, and free diffusion is allowed to occur for a short time. (c) Asthe temperature is lowered again, the asymmetric potential energysurface means that the particles have a greater probability of beingtrapped to the right of their initial position. (d) Relaxation tothe local energy minima.128
Mentions: In a tilting ratchet,the underlying potential energy surface remains unchanged, and detailedbalance is broken by the application of an unbiased driving forceto the particles, such as heat.128 Whenthe applied force is heat, the ratchets are also referred to as temperatureor diffusion ratchets (Figure 5). In its simplest form, the mechanism is very similar tothat of the on–off ratchet. Here, particles cannot cross theenergy maxima at low temperature, but a brief increase in temperatureallows the diffusion of particles across the surface. A lowering oftemperature traps this movement in a manner similar to the on–offpulsating ratchet leading to directional transport. The period ofraised temperature must be brief to prevent general diffusion, whichwould destroy any directionality initially gained.

View Article: PubMed Central - PubMed

Affiliation: School of Chemistry, University of Manchester , Oxford Road, Manchester M13 9PL, United Kingdom.

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Please rate it.

bonded molecules and on catenanes and rotaxanes in which switching of other protic solvents... This effect (listed in descending binding ability) stations on the thread, macrocycle In these systems, fast-responding reporters are preferred... practical applications by utilizing molecular scale changes to create macroscopic effects... The thread of these rotaxanes included an anthracene fluorophore similar application in synthetic polymers often furnishes a useful result... of Brownian motion can be exploited to great effect in the synthesis every aspect of functional molecule and materials design... An improved robotics” in which ratcheted motions of molecular components

No MeSH data available.