
	Where results make sense

Topic: Solvation

Related Topics

Anion

Enthalpy

Solution

Ionic liquid

Hydrogen bond

Isothermal titration calorimeter

Milieu

Suspension (chemistry)

Colloidal gold

Hydroxide

Colloid

Calorimetry

Dissolve

Geometric series

Climax community

In the News (Thu 28 Aug 08)

Gordon Brown

Derby County

Mike Huckabee

Lute Olson

Pearl Harbor

Sonia Gandhi

Ricky Hatton

Narendra Modi

Jesus Christ

Rudy Giuliani

	Solvation Summary
		Solvation is the attraction and association of molecules of a solvent with molecules or ions of a solute.
		For solvation to occur, energy is required to release individual ions from the crystal lattices in which they are present.
		Energy released in this form is called the enthalpy of solvation (or with water as the solvent, the enthalpy of hydration.) Again, the amount of energy released depends on the degree of attraction and the number of solvent molecules the ion associates with, and thus increases with charge density.
	www.bookrags.com /Solvation (838 words)

	Solvation Models
		Inclusion of solvation does result in a substantial percentage increase in computation time, because of the additional integrals that must be evaluated
		In principle, solvation energies calculated by the Cramer-Truhlar method are transferable from semi-empirical to ab initio structures.
		Clearly, solvation modeling is an extremely complex area, and requires considerable sophistication for proper usage.
	chemistry.umeche.maine.edu /Modeling/solvate.html (1457 words)

	Solvation and Hydration Characteristics of Ibuprofen and Acetylsalicylic Acid
		The Gibbs energy of solvation in aliphatic alcohols as well as the enthalpic and entropic fractions thereof were also studied and compared with the respective properties of model substances and other nonsteroidal antiinflammatory drugs (benzoic acid, diflunisal, flurbiprofen, ketoprofen, and naproxen).
		It is probable that while the energy of solvation of the drug increases, the activation barrier of a phase transition from the water to the octanol phase also rises because of bigger energetic expenses needed for the resolvation process (ie, destroying and rebuilding the respective solvation shell).
		Table 1, the enthalpy part of the Gibbs energy of solvation for ASA and IBP exceeds the entropy in the considered solvents.
	www.aapspharmsci.org /view.asp?art=ps060103 (2716 words)

	Solvation Difference Maps as Probes of Intramolecular Hydrogen Bonding: An Application of Hyperactive Molecules
		An analysis using 2D solvation energy contour maps, in which the effect of changing solvent dielectric is represented as a time-dependent animation of the 2D map, reveals geometrical regions associated with intramolecular hydrogen bonds which show up as prominent ridges.
		The solvation model that was used was the COSMO Hamiltonian[3], with energies calculated as enthalpies.
		We conclude that the COSMO solvation algorithm allows energy maps to be constructed with inclusion of complete geometry optimisation, and represents a significant advance in the ability to model the conformational properties of molecules in solution.
	www.ch.ic.ac.uk /rzepa/eccc/eccc.html (0 words)

	Proton transport in water
		The primary solvation structure of hydronium in water is one in which it is coordinated by three water molecules, forming the so-called "Eigen" cation, H
		A second solvation complex is also observed to form, however, in which the excess proton cannot be assigned to a particular oxygen but rather appears to be located directly between two water molecules.
		Ab initio molecular dynamics simulation of the solvation and transport of hydronium and hydroxyl ions in water.
	homepages.nyu.edu /~mt33/ionsolv/ionsolv.html (1498 words)

	QUANTUM Solvation model, aqueous solubility of compounds Solvation Free energies calculation, correlation between ...
		QUANTUM Solvation model, aqueous solubility of compounds Solvation Free energies calculation, correlation between experimental and calculated by Quantum 3.1 values organic molecules and ions, Quantum Mechanics to calculate electronic densities of the molecules in aqueos environment.
		The solubility of one substance dissolving in another is determined by the intermolecular forces between the solvent and solute, temperature, the entropy change that accompanies the solvation, the presence and amount of other substances, and sometimes pressure or partial pressure of a solute gas.
		The solvation model is used both in IC50 and pKa calculations.
	www.q-pharm.com /home/contents/sci_and_tech/proof_of_concept/solv (0 words)

	IMA Workshop: Solvation, December 8-12, 2008
		Physical theories of solvation and their approximate numerical solution have advanced significantly in recent years.
		Solvation properties of biomolecules are critical to their biological activity.
		The dielectric effect of solvents is key to their solvation activity, and this effect is strongly modulated by combinations of hydrophobic and hydrophilic entities in many biological and other systems.
	www.ima.umn.edu /2008-2009/W12.8-12.08 (366 words)

	c29a1 sasa.doc
		Any implicit solvation model based on the solvent accessible surface area loosely relies on the idea that the major contribution to the free energy of solvation of the solute is determined by the surface of the solute that is accessible to the solution.
		The solvation of expclicit hydrogen atoms is neglected.
		The default solvation parameters are SIG1=-0.060, SIG2=0.012 and SIG3=0.0.
	www.dtc.umn.edu /~duany/charmm_doc/sasa.html (0 words)

	Projects 2004
		We have also used the model to investigate solvation dynamics of solutes that are electrostatically attracted and repelled by the head groups and to predict the QENS spectrum S(Q,w) of water hydrogens within RMs and comparing it to experimental results on RMs formed by deuterated aerosol-OT (AOT) surfactant in perdeotero-isoctane.
		This process, called solvation dynamics, is experimentally-accessible by several ultrafast spectroscopic methods, the most commonly used one being fluorescence upconversion which monitors the time-evolution of the Stokes shift in the flourescence spectrum of a dissolved chromophore.
		We are using molecular theory and MD simulation to determine the molecular mechanisms of the solvation response in a variety of solvent media, including one-component liquids, liquid mixtures, supercritical fluids, surfactant assemblies and liquid-solid interfaces.
	www.chm.colostate.edu /bl/res03.htm (0 words)

	3.5.1 Calculating solvation energies of molecules in water
		In view of the large interest in solvation of small molecules, we include in the demo our benchmark (solv_benzene).
		The calculated and observed solvation energies are given in Table 3.25 and Fig.
		solvation free energies (in water) for a benchmark of neutral and charged molecules.
	diana.imim.es /~jvilla/molaris/theory_molaris/node54.html (243 words)

	Solvation and Hydration Characteristics of Ibuprofen and Acetylsalicylic Acid (Site not responding. Last check: )
		The Gibbs energy of solvation in aliphatic alcohols as well as the enthalpic and entropic fractions thereof were also studied and compared with the respective properties of model substances and other nonsteroidal antiinflammatory drugs (benzoic acid, diflunisal, flurbiprofen, ketoprofen, and naproxen).
		It is probable that while the energy of solvation of the drug increases, the activation barrier of a phase transition from the water to the octanol phase also rises because of bigger energetic expenses needed for the resolvation process (ie, destroying and rebuilding the respective solvation shell).
		Table 1, the enthalpy part of the Gibbs energy of solvation for ASA and IBP exceeds the entropy in the considered solvents.
	www.aapsj.org /view.asp?art=ps060103 (0 words)

	Computational Protein Design Is a Challenge for Implicit Solvation Models Biophysical Journal - Find Articles
		Five implicit solvation models, a surface area-based empirical model, two models that approximate the generalized Born treatment and a finite difference Poisson-Boltzmann method are challenged in situations differing from those where these models were calibrated.
		It is concluded that protein design is a particularly challenging test for implicit solvation models because it requires accurate estimates of the solvation contribution of individual residues.
		Empirical models generally assume that the solvation free energy of the solute is a sum of atom or group contributions.
	findarticles.com /p/articles/mi_qa3938/is_200501/ai_n9476488?lstpn=article_results&lstpc=search&lstpr=external&lstprs=other&lstwid=1&lstwn=search_results&lstwp=body_middle (0 words)

	3.5.3 Solvation energy of a part of a macromolecule
		In determining electrostatic free energies of charged groups in proteins the key difficulty is not the interaction between charges, but it is in calculating the ``self-energy'' or ``solvation energy'' (the energy of moving the charged group into its protein site from vacuum).
		In this demo, the solvation free energy of the positively charged NH group of a lysine residue in a dodedcapeptide is calculated.
		The resulting solvation energy is used in the subsequent calculations.
	diana.imim.es /~jvilla/molaris/theory_molaris/node56.html (844 words)

	Solvation
		An accurate approach that has been applied to calculating solvation free energies is the use of either molecular dynamics (MD) or Monte Carlo (MC) simulations, for which the solute is surrounded with explicit solvent molecules.
		Although simulations have been demonstrated to produce acceptable solvation free energy differences for small organic molecules and peptides, these simulation methods are tedious and time consuming.
		We have been developing a new methodology for simulations of solvation free energies from a single MD or MC calculations, without the need for performing free-energy simulations.
	truong.hec.utah.edu /Solvation.html (491 words)

	Solvation effects on the S2 reaction in water
		Calculations on the isolated system (reaction in the gas phase at zero temperature) were performed for reference purposes.
		Qualitatively the calculations confirm that the double-well free energy profile of the reaction in the gas phase is converted into a single barrier by solvation, and that the height of the barrier increases significantly.
		This indicates that the ab initio (DFT) MD very well captures the differential energetic as well as entropic effects of the solvation when going from the (solvated) reactants to the initial ion-dipole complex to the transition state.
	www.cmm.upenn.edu /~ensing/thesis/node12.html (0 words)

	QUANTUM Solvation model, aqueous solubility of compounds Solvation Free energies calculation, correlation between ...
		QUANTUM Solvation model, aqueous solubility of compounds Solvation Free energies calculation, correlation between experimental and calculated by Quantum 3.1 values organic molecules and ions, Quantum Mechanics to calculate electronic densities of the molecules in aqueos environment.
		The solubility of one substance dissolving in another is determined by the intermolecular forces between the solvent and solute, temperature, the entropy change that accompanies the solvation, the presence and amount of other substances, and sometimes pressure or partial pressure of a solute gas.
		The solvation model is used both in IC50 and pKa calculations.
	q-pharm.com /home/contents/sci_and_tech/proof_of_concept/solv (863 words)

	NationMaster - Encyclopedia: Solvation shell
		Solvation shell is a shell of any chemical species acting as a solvent, surrounding a solute species.
		Whatever reaction occurs, the solute is said to become solvated by molecules of the solvent, which means that the solvent forms a kind of shell around the solute particles, which is called a solvation shell.
		Structures of solvation shells and coordination numbers are both very useful concepts, as they give a direct measure of the solubility of various solutes in water.
	www.nationmaster.com /encyclopedia/Solvation-shell (268 words)

	Kids.Net.Au - Encyclopedia > Solvation
		Solvation is the attraction and association of molecules of a solvent with molecules or ions of a solute.
		For solvation to occur, energy is required to release individual ions from the ionic lattices they are present in.
		Energy released in this form is called the enthalpy of solvation (or with water as the solvent, the enthalpy of hydration.) Again, the amount of energy released depends on the degree of attraction and the number of solvent molecules the ion associates with, and thus increases with charge density.
	www.kids.net.au /encyclopedia-wiki/so/Solvation (334 words)

	Solvation (Site not responding. Last check: )
		Solvation effects in biomolecules are critical to any reliable theoretical description.
		Derivatives in conventional boundary element solvation methods are typically treated approximately, and contain singularities that arise from discontinuities in the potential.
		Surface elements are modeled by spherical Gaussian functions with exponents calibrated to obtain the exact Born ion energy and uniform surface charge density, and avoid Coulomb singularities present in conventional point-charge surface element models.
	www.chem.umn.edu /groups/york/solvation.html (273 words)

	Scuola di Dottorato Galileo Galilei
		Solvation dynamics corresponds to the rate of solvent reorganization in response to a sudden change in solute-solvent interactions.
		In bulk liquids, solvation dynamics occurs primarily through reorientation of the surrounding solvent molecules.
		In heterogeneous environments, other solvation mechanisms, associated with changes in the location of the solute relative to the interface, are possible and can play an important role.
	www.di.unipi.it /galilei/Calendar/050427Seminar/Schedule.html (218 words)

	solvation Information Center - nickel oxide water solvation
		For solvation to occur, energy is required to release individual ions from the ionic lattices in which they are present.
		Energy released in this form is called the enthalpy of solvation (or with water as the solvent, the enthalpy of hydration.) Again, the amount nickel oxide water solvation of energy released depends on the degree of attraction and the number of solvent molecules the ion associates with, and thus increases with charge density.
		A negative value for the enthalpy change of solvation solution corresponds to an ion that is likely to dissolve, whereas a high positive value means that solvation will not occur.
	www.scipeeps.com /Sci-Chemistry_Topics_S/solvation.html (347 words)

	[No title]
		Solvation effects play a profound role in the energetics of protein folding.
		While a continuum dielectric model of solvation may provide a sufficiently accurate estimate of the solvation effects, until now this model was too computationally expensive and unstable for folding simulations.
		An ensemble of betabetaalpha conformations was found at and near the global minimum of the energy function with the REBEL electrostatic solvation term.
	abagyan.scripps.edu /lab/web/man/elecsolv.htm (284 words)

	QSG: Research: Computational Biology: Dimethyl Phosphate
		The solvation of ions is a fundamental problem encountered in a wide range of biological and chemical systems.
		In particular, the manner in which water solvates alkali metal cations is relevant to problems such as the mechanism of enzymatic catalysis, and the structural stability of DNA and RNA.
		The four solid lines represent waters that always stay in the first solvation shell, and the dashed lines are waters that make exchanges from the second to the first shell during the simulation.
	www-phys.llnl.gov /Research/qsg-old/research/compbio/ions (527 words)

	Nature of dissolved species (Site not responding. Last check: )
		This means that coordination numbers change in time and the solvation shell is not a static object but changes its shape and composition continually.
		Solvated hydronium cation with first solvation shell (left); Solvated Zundel cation formed when a proton is transfered from hydronium to a first solvation-shell water (right).
		Solvated hydroxide ion with first solvation shell in a fourfold coordinated state (left); Same in a threefold coordinated state.
	www.nyu.edu /classes/tuckerman/honors.chem/lectures/lecture_12/node8.html (586 words)

Try your search on: Qwika (all wikis)