Water Freezes Differently on Positively and Negatively Charged Surfaces of Pyroelectric Materials

  title={Water Freezes Differently on Positively and Negatively Charged Surfaces of Pyroelectric Materials},
  author={David Ehre and Etay Lavert and Meir Lahav and Igor Lubomirsky},
  pages={672 - 675}
Freezing Supercool Water Under equilibrium conditions, water will freeze at 0°C, but, under certain conditions, it can be kept in a supercooled liquid form below this temperature. Ehre et al. (p. 672) present a careful and detailed study of the freezing of water drops on both positively and negatively charged pyroelectric surfaces using a combination of optical microscopy and x-ray diffraction: Supercooled water froze at different temperatures, depending on the charge of the substrate with the… Expand
Source of Electrofreezing of Supercooled Water by Polar Crystals.
It is demonstrated that preventing the formation of charge at these surfaces, by linking the two hemihedral faces of the polar crystals with a conducting paint, reduces the temperature of freezing by 2-5 °C, implying that the surface-charge-induced interactions affect the interfacial water molecules that trigger freezing at a higher temperature. Expand
Heterogeneous Electrofreezing as Triggered by CO2 on Pyroelectric Crystals. A Qualitative Difference of Icing on Hydrophilic and Hydrophobic Surfaces.
By performing icing experiments on hydrophilic and hydrophobic surfaces of pyroelectric amino acids and on the x-cut faces of LiTaO 3 , we discovered that the effect of electrofreezing of superExpand
An electrochemical in situ study of freezing and thawing of ionic liquids in carbon nanopores.
This study shows that RTILs may show a tremendously different thermal behavior when comparing bulk with nanoconfined properties as a result of the increased surface energy of carbon pore walls, accompanied by slowed-down charge-discharge kinetics as seen with in situ electrochemical characterization. Expand
Surface-charge-induced orientation of interfacial water suppresses heterogeneous ice nucleation on α -alumina (0001)
Abstract. Surface charge is one of the surface properties of atmospheric aerosols, which has been linked to heterogeneous ice nucleation and hence cloud formation, microphysics, and opticalExpand
Water freezes at near-zero temperatures using carbon nanotube based electrodes under static electric fields.
A systematic study of the effect of an electric field on water freezing by varying the thickness of a dielectric layer and the voltage across it in an electro-wetting system reveals that this behavior is due to saturation in the contact angle of the ice embryo with the underlying substrate. Expand
Heterogeneous Electrofreezing of Super Cooled Water on Surfaces of Pyroelectric Crystals is Trigered by Planar-Trigonal Ions.
Molecular dynamic simulations suggest that the hydrated planar-trigonal HCO 3 ⁻ ions self-assemble with water molecules near the surface of the AgI crystal as clusters of slightly different configuration from those of the ice-like hexagons, but these clusters have a tendency to serve as embryonic nuclei for ice crystallization. Expand
Freezing of water next to solid surfaces probed by infrared-visible sum frequency generation spectroscopy.
It is believed that the segregation of sodium ions next to the negatively charged sapphire substrate may be responsible for disrupting the charge transfer and stitching bilayer at high pH, providing a plausible explanation for the experimental observations. Expand
Morphology of supercooled droplets freezing on solid surfaces
Supercooled droplets freezing on solid surfaces are ubiquitous in nature. This letter investigates the influences of droplet viscosity on freezing velocity and frosting formation. Several experimentsExpand
Electrofreezing of water droplets under electrowetting fields.
This work studies ice nucleation in electrowetted water droplets, wherein there is no electric field inside the droplet resting on a dielectric layer, and there is an interfacial electric field and charge buildup at the solid-liquid interface. Expand
Mechanism of supercooled droplet freezing on surfaces.
A novel perspective to icing and icephobicity is brought, unveiling the strong influence of environmental conditions in addition to the accepted effects of the surface conditions and hydrophobicity. Expand


Effects of electrode materials on freezing of supercooled water in electric freeze control
In order to clarify effects of electric charge on freezing of supercooled water, experiments were carried out with various kinds of electrodes in supercooled water. Water sample was kept in a testExpand
Heterogeneous surface crystallization observed in undercooled water.
Observations of higher freezing temperatures when an ice-forming nucleus is near the surface of an undercooled water drop than when the nucleus is immersed in the drop are reported, thereby complementing and providing evidence for homogeneous surface crystallization, which has been hypothesized recently. Expand
Water's size-dependent freezing to cubic ice.
  • G. P. Johari
  • Chemistry, Medicine
  • The Journal of chemical physics
  • 2005
A critical radius r(c) of appromximately 15 nm for a water droplet and a critical thickness delta( c) of approximately 10 nm for water's flat film is calculated, which provides a thermodynamic basis for the occasionally found presence of cubic ice in the atmosphere and explains why water's nanometers-sized clusters and water confined to nanometer-sized pores freeze to cubic ice. Expand
Voltage-dependent ordering of water molecules at an electrode–electrolyte interface
THE arrangement of water molecules at charged, aqueous interfaces is an important question in electrochemistry, geochemistry and biology. Theoretical studies1–11 suggest that the molecules becomeExpand
Electrofreezing of confined water.
Results from molecular dynamics simulations of the freezing transition of TIP5P water molecules confined between two parallel plates under the influence of a homogeneous external electric field show a close similarity between the local structure of the liquid phase and the short-range order of the corresponding solid phase. Expand
Molecular dynamics simulation of the ice nucleation and growth process leading to water freezing
A molecular dynamics trajectory is presented that captures the molecular processes involved in the freezing of pure water and finds that ice nucleation occurs once a sufficient number of relatively long-lived hydrogen bonds develop spontaneously at the same location to form a fairly compact initial nucleus. Expand
Polarizable point‐charge model for water: Results under normal and extreme conditions
Molecular dynamics simulations of liquid water under normal and extreme conditions are performed using the polarizable point‐charge (PPC) model. This efficient three‐site model explicitlyExpand
On the role of cubic structure in ice nucleation
Abstract To clarify the formation mechanism of snow polycrystals the possibility of formation of a cubic ice embryo is discussed on the basis of the homogeneous nucleation theory for supercooledExpand
Electrofreezing of supercooled water
SummaryThe results of a wind tunnel and could chamber investigation on the effect of intense electric fields on ice-nucleation in supercooled water are presented. It is found that electrostaticallyExpand
Structures and charging of alpha-alumina (0001)/water interfaces studied by sum-frequency vibrational spectroscopy.
The pzc of amorphous alumina was found to be similar to that of powder alumina, and the result can be understood from the pK values of protonation and deprotonation at the water/alpha-Al2O3 (0001) interface. Expand