ion exchange


  • WordNet 3.6
    • n ion exchange a process in which ions are exchanged between a solution and an insoluble (usually resinous) solid; widely used in industrial processing
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In news:

A global supplier of ion exchange resins, has received ISO 9001:2000 certification for its manufacturing plant in Philadelphia, as well as its corporate offices in Bala Cynwyd, PA.
Beleaguered lithium-ion battery manufacturer A123 Systems Inc has been dealt yet another blow — it was notified Tuesday by Nasdaq that its stock price is too low and could be delisted from the exchange's index.
Typical cation exchange water softeners have been under regulatory attack because of the salt used to regenerate the ion exchange bed and the water, which is sent to waste during the regeneration process.
Ion exchange resins used in softening, anion or deionization applications are designed to remove certain ionized substances from water.
It is therefore important to ensure that a sufficient buffer concentration is used and that the IEX column is fully equilibrated to ensure that any buffer- ion exchange is complete prior to loading valuable product onto the column.
Ion Exchange Resins and Processes for Industrial Water Treatment.
Nitrate Removal by Ion Exchange .
Envirogen Technologies Inc announced the successful startup of an ion exchange system for the East Valley Water District (EVWD) of San Bernardino County, Calif, to remove uranium and nitrates from groundwater at the District's #40 well site.
Purolite's softening calculator is a simple-to-use tool requiring the minimum of inputs to estimate ion exchange resin requirements to soften water, and can be found on
The ion exchangers cannot tell water made with tritium from any other water, nor can they remove it.
Novel Strategy Combines Albumin and IgG Removal with Ion-Exchange Fractionation.
Today's power plants are more frequently choosing off-site regeneration for the ion exchange resins used in boiler feedwater makeup applications.
Specialty chemicals company LANXESS is to increase its prices for Lewatit and Ionac ion exchange resins by up to 10 percent globally.
Indeed, ultrapure water is the basis for innumerable analytical applications like atomic absorption, ion exchange chromatography and inductively coupled plasma mass spectrometry (ICP-MS).
The resin's chemical structure avoids the "nitrate dumping" that can occur when traditional ion exchange resins are used to treat nitrate-bearing drinking water.

In science:

Inside the solid, the potential V eff seen by an electron becomes attractive, due to the electrostatic potential of the ion cores, due to the electrostatic field of the surface-dipole layer, and due to the lowering of the electron energy by the formation of an exchange-correlation hole.
Theory of Adsorption on Metal Substrates
In this case, the interplay between strongly nonlinear interwell charge transport and the large tunable spin splitting induced by exchange interactions with spin-polarized Mn ions produces interesting spin features.
Photon-assisted transport in semiconductor nanostructures
We found that percentage of the charge exchange rate in the net ionization rate of these ions in the solar neighbourhood depends only weakly on the heliocentric distance.
Are the sungrazing comets the inner source of pickup ions and energetic neutral atoms?
The exponential t slope parameter b ≈ 11.5 GeV−2 obtained in d+Au collisions where the deuteron dissociates is similar to values measured in scattering off the proton at HERA. A theoretical study of the role of multiphoton exchange in lepton pair production in heavy-ion collisions has been presented by Kuraev .
Summary of Working Group B: Diffraction and Vector Mesons
Here we report a success in obtaining a clean theoretical formula directly relating dynamical correlation, as characterized by the exchange-correlation (xc) kernel of time-dependent density-functional theory (TDDFT), with the experimentally observed stopping power (SP) of solids for slow ions.
Time-Dependent Density-Functional Theory for the Stopping Power of an Interacting Electron Gas for Slow Ions
Ti4+ ions were separated from Cu by ion-exchange techniques and Ti was finally converted to TiO2 .
The 40Ca(alpha,gamma)44Ti reaction in the energy regime of supernova nucleosynthesis
At k⊥ρi ∼ 1, ions can exchange energy with electromagnetic fluctuations via wave – particle interactions (and ion heating eventually occurs via a kinetic ion-entropy cascade, see §§ 7.9-7.10).
Astrophysical gyrokinetics: kinetic and fluid turbulent cascades in magnetized weakly collisional plasmas
Single-ion anisotropies, exchange interactions, point symmetry and crystal structure all contribute in a complicated way to the total magnetic anisotropy of the giant spin.
Quantum nanomagnets and nuclear spins: an overview
Heitler and London for the H+ 2 molecular ion (in this case, an H atom and an H+ ion are held together by the exchange of an electron).
Ettore Majorana and his heritage seventy years later
This D/H ratio typical of ion molecule chemistry suggests that IOM exchanged its H isotopes with an ionized reservoir, possibly H2D+, formed at very low temperature (< 40 K, Gourier et al. 2008).
Meteorites and the physico-chemical conditions in the early solar nebula
The attractive interaction to form electron-electron Cooper pairs is by exchanging a phonon, which is a collective excitation of the positive ion background.
QCD phase diagram at high temperature and density
Ions and electrons normally exchange energy via Coulomb collisions.
Foundations of Black Hole Accretion Disk Theory
The functions FZ,z contain all ionization and recombination rates which, due to charge exchange and ionization by collisions of neutral atoms, may also depend on the particle density of other ions ˜n ˜Z , ˜z .
The dynamical signature of the ISM in soft X-rays -- I. Diffuse soft X-rays from galaxies
The coherent evolution of the internal atomic state is thus insensitive to the vibrational quantum numbers, and it may be observed with ions in any superposition or mixture of vibrational states, even if the ions exchange vibrational energy with a surrounding reservoir.
RISQ - reduced instruction set quantum computers
The bound magnetic polaron then originates from the exchange interaction between a rather localized unpaired carrier and the 5/2 spin of the surrounding Mn2+ ions.