Disorder + disorder = more disorder?

November 4, 2014
Chaos is not necessarily bad for us if we know how to counteract it with a little properly applied disorder of our own. Credit: A.Naji/IPM

If you took the junk from the back of your closet and combined it with the dirty laundry already on your floor, you would have an even bigger mess. While this principle will likely always hold true for our bedrooms, it turns out that in certain situations, combining messes can actually reduce the disorder of the whole. An international team of researchers from Slovenia and Iran has identified a set of conditions in which adding disorder to a system makes it more orderly. This behavior is known as antifragility, a concept introduced recently to describe similar phenomena in statistics, economics and social science.

In a paper published Nov. 4 in The Journal of Chemical Physics, from AIP Publishing, the researchers found a counterintuitive interplay between two different types of disorder. One is thermodynamic disorder, or entropy. The other is the structural disorder—defects in an idealized system that can change its properties.

"One expects that different types of disorder just add to one another to one final mess at the end," said Ali Naji, the lead author of the paper and a researcher from the Institute for Research in Fundamental Sciences in Tehran. "But surprisingly, we find that in some cases, structural disorder can counteract the thermal disorder, making the system overall more ordered."

The exception that the researchers identified involved the interaction between the structural disorder of charged surfaces and the thermal disorder of Coulomb fluids—collections of mobile charged particles, either ions or larger molecules, that interact with each other.

They compared two different types of charged surfaces. In the orderly one, the charges were evenly distributed across the surface. In the messy one, positive and negative charges were spread randomly across the surface, though they maintained their positions once placed—a situation called "quenched disorder."

When the researchers put each of these surfaces in contact with a Coulomb fluid, they found that the ions in the Coulomb fluid were more strongly attracted to the disordered surface than to the ordered one. Surprisingly, when they then calculated the entropy of both systems, they found that the randomly charged system had lower entropy than the uniformly charged one—the addition of structural disorder opposed the effects of the Coulomb fluid's thermal disorder.

Unfortunately, the finding won't revolutionize our approach to cleaning anytime soon. "This only works for certain cases and under certain conditions," Naji said. "We find out that the disordered charges have to interact strongly with the mobile charges in the Coulomb fluid in order to have this behavior." However, the researchers eventually hope to identify these systems in areas more directly applicable to human lives.

"One wonders in what other systems one could observe even more spectacular cases [of these systems] that would help us stave degradation, spontaneous disordering and aging of materials and instill robustness and resilience," said Rudolf Podgornik, a researcher from the Jozef Stefan Institute and University of Ljubljana, Slovenia who is the senior coauthor of this paper. "Chaos is not necessarily bad for us if we know how to counteract it with a little properly applied disorder of our own."

Explore further: Electric charge disorder: A key to biological order?

More information: "Asymmetric Coulomb fluids at randomly charge dielectric interfaces: Anti-fragility, overcharging, and charge inversion," by Ali Naji, Malihe Ghodrat, Haniyeh Komaie-Moghaddam and Rudolf Podgornik, Journal of Chemical Physics, November 4, 2014. scitation.aip.org/content/aip/journal/jcp/141/17/10.1063/1.4898663

Related Stories

Electric charge disorder: A key to biological order?

April 30, 2012

Theoretical physicist Ali Naji from the IPM in Tehran and the University of Cambridge, UK, and his colleagues have shown how small random patches of disordered, frozen electric charges can make a difference when they are ...

Consider the 'anticrystal'

July 7, 2014

(Phys.org) —For the last century, the concept of crystals has been a mainstay of solid-state physics. Crystals are paragons of order; crystalline materials are defined by the repeating patterns their constituent atoms and ...

Sleep drunkenness disorder may affect one in seven

August 25, 2014

A study is shining new light on a sleep disorder called "sleep drunkenness." The disorder may be as prevalent as affecting one in every seven people. The research is published in the August 26, 2014, print issue of Neurology, ...

Recommended for you

Understanding nature's patterns with plasmas

August 23, 2016

Patterns abound in nature, from zebra stripes and leopard spots to honeycombs and bands of clouds. Somehow, these patterns form and organize all by themselves. To better understand how, researchers have now created a new ...

Light and matter merge in quantum coupling

August 22, 2016

Where light and matter intersect, the world illuminates. Where light and matter interact so strongly that they become one, they illuminate a world of new physics, according to Rice University scientists.

Measuring tiny forces with light

August 25, 2016

Photons are bizarre: They have no mass, but they do have momentum. And that allows researchers to do counterintuitive things with photons, such as using light to push matter around.

Stretchy supercapacitors power wearable electronics

August 23, 2016

A future of soft robots that wash your dishes or smart T-shirts that power your cell phone may depend on the development of stretchy power sources. But traditional batteries are thick and rigid—not ideal properties for ...

Spherical tokamak as model for next steps in fusion energy

August 24, 2016

Among the top puzzles in the development of fusion energy is the best shape for the magnetic facility—or "bottle"—that will provide the next steps in the development of fusion reactors. Leading candidates include spherical ...

4 comments

Adjust slider to filter visible comments by rank

Display comments: newest first

tadchem
not rated yet Nov 04, 2014
There are many political innuendoes that could be made regarding "a set of conditions in which adding disorder to a system makes it more orderly".
Jim4321
not rated yet Nov 04, 2014
Bait and switch!
Da Schneib
not rated yet Nov 04, 2014
You can add a negative version of disorder (an optical flat, reversed to remove its distortions from an image) to an image to get a better image. You have eliminated noise in your sensor by doing this.

This result doesn't surprise me at all. However, it is a novel use of the idea, and provides hints to underlying physics that will no doubt turn out to be interesting later.
swordsman
not rated yet Nov 05, 2014
One example of state disorder is when a cue ball is lined up for the break in a pool game. The cue ball can hit a single ball in the rack, and the ball that it hits can hit one, two or three others. This continues until all of the balls are in disorder. However, they all come to rest in various locations in a steady state condition. It is also possible for one ball to hit two or three others, and the hit balls all go to pockets. This is akin to Planck's quantum state theory, except that in that case the states were initially chemical and then electromagnetic.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.