Dielectric Response of Water

 


New physics emerges when water gets inside nanopores measuring below 10 nanometers. New phases of ice was observed and ultrafast proton transport was measured.

 When it comes to biology, confined water plays an interesting role. Aquaporins cross cellular membranes to allow transport of water and other tiny molecules through nanometer-scale passages.

 However, the biology field is missing a fundamental truth about how confinement impacts the ability of water to screen electric fields inside one-dimensional pores.

The Journal of Physical Chemistry Letters released this information last month (on the cover). Lawrence Livermore from the University of Texas at Austin is using simulators in order to explain the response of confined water to applied electric fields. 

“It’s necessary to understand the ability of the confined liquid to screen electric fields and how this varies from the bulk environment,” reports Marcos Andrade, lead author. “An improved understanding of the dielectric response of confined water is important not only for advancing separation technologies but also for other emerging applications, such as energy storage and conversion.”

Water desalination and photochemical water splitting are some of the applications that the ion selectively of nanopores less than 10nm is capable of. 

In brand new research, the team used computers to derive the hydrophobic nanoconfinement effect on the dielectric properties of water. The computer predicted the potential energy surface of the system.  

The  molecular dipole of water was also researched. 

Andrade summarizes “our work reveals peculiar impacts of 1-D hydrophobic nanoconfinement, not only in the dielectric constant, but also on the electronic structure of water that can not be observed with simulations based on conventional parametric force fields.” 

The research continues! 

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