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Topic: Hydrophobe


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In the News (Tue 25 Jun 19)

  
  Hydrophobe - Wikipedia, the free encyclopedia
Hydrophobe (from the Greek (hydros) "water" and (phobos) "fear") in chemistry refers to the physical property of a molecule that is repelled by water.
Hydrophobic or lipophilic species, or hydrophobes, tend to be electrically neutral and nonpolar, and thus prefer other neutral and nonpolar solvents or molecular environments.
It is this effect that causes the hydrophobic interaction - which in itself is incorrectly named as the energetic force comes from the hydrophilic molecules.
en.wikipedia.org /wiki/Hydrophobe   (285 words)

  
 [No title]   (Site not responding. Last check: 2007-10-21)
Since the substrate to be phosphorylated aligns with the kinase by several key amino acids (usually through hydrophobic forces and ionic bonds), a kinase is usually specific, not to a single substrate, but to a whole "substrate family" having common properties.
Hydrophobic molecules like diacylglycerol and phosphatidylinositols are membrane-associated and diffuse from the plasma membrane into the juxtamembrane space where they can reach and regulate membrane-associated effector proteins.
The exteriors of the sand grains are thus coated with hydrophobic groups.
www.worldhistory.com /wiki/H/Hydrophobe.htm   (570 words)

  
 Hydrophobe
Hydrophobe (Greek, "water-fearing) is a property of a molecule and means it is repelled by water.
Hydrophobe is a noun meaning that which fears water.
Hydrophobic is an adjective meaning "water-fearing." Then, a molecule would have the property of hydrophobia, and would be hydrophobic.
www.ebroadcast.com.au /lookup/encyclopedia/hy/Hydrophobe.html   (159 words)

  
 Stable aqueous emulsions of ketene dimer/nonreactive hydrophobe - Patent 4919724
The nonreactive hydrophobe does not react with the fibers or wood chips, but is present merely as a water repellent deposit on the fiber or wood chips.
The aqueous emulsion of the present invention comprises AKD and nonreactive hydrophobe as dispersed phases in an aqueous solution of stabilizer where the water is the continuous phase.
The nonreactive hydrophobes which may be used in the emulsion of the present invention include both crude and refined paraffin waxes, hydrocarbon resins, terpene resins, synthetic waxes, naturally occurring waxes such as vegetable and animal waxes, e.g.
www.freepatentsonline.com /4919724.html   (3902 words)

  
 Associative Thickeners for Viscosity Retention upon Tinting - Archives - Paint and Coatings Industry
For premium-class associative thickeners based on polyethyleneglycol, the hydrophobic caps are in most cases linked to the polyethyleneglycol by reaction with a diisocyanate to form a polyurethane.
The ability to add very high levels of hydrophobe is a special property of aminoplast chemistry and it allows the production of associative thickeners that resist viscosity loss upon the addition of glycols or surfactants to paints, as happens during tinting of paints with concentrated colorants.
Hydrophobes are desorbed from emulsion particle surfaces by more hydrophobic parts of these molecules or micelle structures are weakened.
www.pcimag.com /CDA/Archives/62cde45f4b6a7010VgnVCM100000f932a8c0____   (1412 words)

  
 Hydrophobe   (Site not responding. Last check: 2007-10-21)
Hydrophobe (Greek " water - fearing) is a property of a molecule and means it is repelled by Hydrophobic molecules tend to cluster together.
O for switching hydrogen bonds which makes whole area around the hydrophobic molecule energetically As one larger area of this kind energetically more favourable than two smaller ones thermodynamics favour hydrophobic molecules clustering together even hydrophobic molecules are not actually attracted to another.
Hydrophobe is a noun meaning that which water.
www.freeglossary.com /Hydrophobe   (149 words)

  
 Hydrophobe   (Site not responding. Last check: 2007-10-21)
Hydrophobe (Greek, " water - fearing) is a property of a molecule and means it is repelled by water.
As one larger area of this kind is energetically more favourable than two smaller ones, thermodynamics favour hydrophobic molecules clustering together, even thoughhydrophobic molecules are not actually attracted to another.
Hydrophobic is an adjective meaning"water-fearing." Then, a molecule would have the property of hydrophobia, and would be hydrophobic.
www.therfcc.org /hydrophobe-106055.html   (168 words)

  
 bibliothèque numérique RERO DOC: Notice détaillée #494
Here I have demonstrated that the important features of the destabilizing effect of chaotropic cosolvents on hydrophobic aggregates may be described within the same two-state model, with adaptations to focus on the ability of such substances to alter the structure of water.
Based on the surface exposure of the 20 amino-acids in native proteins I have defined the a new hydrophobicity scale, which may lead to an improvement in the comparison of experimental data with the results from theoretical HP models.
Overall, I have shown that the primary features of the hydrophobic interaction in aqueous solutions may be captured within a model which focuses on alterations in water structure around non-polar solute particles.
doc.rero.ch /search.py?recid=494#abstract_fre   (1779 words)

  
 Hydrophobe substituted, water-soluble cationic polysaccharides - Patent 4663159
Hydrophobes containing alkyl groups which have less than 8 carbon atoms or aryl groups will generally not provide sufficient hydrophobic substitution to the quaternary nitrogen-containing polysaccharides to produce the superior combination of properties exhibitied by the hydrophobe substituted polysaccharides of this invention.
The hydrophobe substituted, cationic polysaccharides of this invention are cationic usually due to the presence of quaternary nitrogen.
The hydrophobe substituted polysaccharide produced in Run #40, having a hydrophobe containing alkyl group of 8 carbon atoms, does not provide increased viscosity upon salt addition, indicating that either additional hydrophobe substitution is required or that hydrophobes containing alkyl groups of greater than 8 carbon atoms may be required to provide this property.
www.freepatentsonline.com /4663159.html   (11492 words)

  
 Hydrophobe - Wikipédia
Un composé est dit hydrophobe (du grec υδρο,hydro = eau, et Φοβοσ,Fóbos = peur) ou lipophile quand il est soluble dans les corps gras, mais insoluble dans l'eau.
Un composé hydrophobe, n'a pas la capacité de créer des liaisons hydrogène avec les molécules d'eau.
Un composé hydrophobe est donc un composé qui ne peut pas interagir physiquement avec l'eau.
fr.wikipedia.org /wiki/Hydrophobe   (247 words)

  
 Patent 6,093,391
Especially preferred are compositions wherein the hydrophobe molecular weight of the polyether block copolymer is at least about 2000 and the hydrophobe weight percentage is at least about 20%.
In further preferred embodiments, the hydrophobe weight is at least about 2000 and the hydrophobe percentage is at least about 20%, preferably 35%; or the hydrophobe weight is at least about 2300 and the hydrophobe percentage is at least about 20%, preferably 35%.
Additionally particularly preferred among these polymers are that having hydrophobe weights between about 3500 and about 4000, preferably between about 3700 and about 3800, and hydrophobe percentages between about 25% and about 35%, preferably between about 28% and about 32%.
www.pharmcast.com /Patents/072500OG/6093391_Peptide072500.htm   (1201 words)

  
 Surfactants: Detergent Chemistry
The hydrophobe is usually the equivalent of an 8 to 18 carbon hydrocarbon, and can be aliphatic, aromatic, or a mixture of both.
The sources of hydrophobes are normally natural fats and oils, petroleum fractions, relatively short synthetic polymers, or relatively high molecular weight synthetic alcohols.
In each case, the hydrophilic end of the surfactant is strongly attracted to the water molecules and the force of attraction between the hydrophobe and water is only slight.
www.chemistry.co.nz /surfactants.htm   (680 words)

  
 Hydrophobie (Chemie) - Wikipedia
Hydrophobe Stoffe sind so gut wie immer lipophil, das heißt sie lösen sich gut in Fett und Öl auf.
Hydrophobe Oberflächen bestehen in der Regel aus hydrophoben Substanzen oder sind von diesen bedeckt.
Ein Extrembeispiel für eine hydrophobe Oberfläche ist die Oberfläche von Blättern und Blüten des Lotus.
de.wikipedia.org /wiki/Hydrophob   (286 words)

  
 Hydrophobe: Facts and details from Encyclopedia Topic   (Site not responding. Last check: 2007-10-21)
In chemistry, hydrophobic or lipophilic species, or hydrophobes, tend to be electrically neutral and nonpolar, and thus prefer other neutral and nonpolar...
A hydrophobic molecule cannot establish hydrogen bonds with water, EHandler: no quick summary.
Hydrophobic is an adjective meaning "water-fearing." Then, EHandler: no quick summary.
www.absoluteastronomy.com /encyclopedia/h/hy/hydrophobe.htm   (410 words)

  
 Tech Notes - New York SCC
It is therefore not surprising that a series of surfactants which are based upon silicone as a hydrophobe, that contain other functional groups similar to those seen in traditional surfactants, would be developed.
In some instances, silicone is incorporated into a surface active agent, with a polyoxyalkylene portion of the molecule and or a hydrocarbon portion of the molecule.
If one either includes a silicone group as the hydrophobe or includes a silicone hydrophobe in the molecule, a whole new world of formulator-friendly compounds opens up.
www.nyscc.org /news/archive/tech0100.htm   (677 words)

  
 TEL :: CONSULTER
Hydrophobic polyelectrolytes are water-soluble polymers, carrying charged groups in water, which is a poor solvent for the backbone.
These observations are interpreted in the framework of a theoretical model predicting a pearl-necklace conformation for the single chain, composed of dense globules (the pearls) connected by elongated chain segments.
Hydrophobic polyelectrolytes adsord also spontaneously onto hydrophobic substrates, the pearls, in some cases, unfolding on the surface.
tel.ccsd.cnrs.fr /documents/archives0/00/00/36/20/index_fr.html   (855 words)

  
 U.S. Patent: 5017370 - Improved method of performing angioplasty procedures - May 21, 1991
wherein a is an integer such that the hydrophobe represented by (C.sub.3 H.sub.6 O) has a molecular weight of from 950 to 4000, preferably from 1750 to 4000, and b is an integer such that the hydrophile portion represented by (C.sub.2 H.sub.4 O) constitutes from approximately 50% to 90% by weight of the compound.
wherein a is an integer such that the hydrophobe represented by (C.sub.3 H.sub.6 O) has a molecular weight of approximately 950 to 4000, preferably from 1750 to 4000, and b is an integer such that the hydrophile portion represented by (C.sub.2 H.sub.4 O) consitutes from approximately 50% to 90% by weight of the compound.
wherein a is an integer such that the hydrophobe represented by (C.sub.3 H.sub.6 O) has a molecular weight of approximately 950 to 4000, preferably from 1750 to 4000, and b is an integer such that the hydrophile portion represented by (C.sub.2 H.sub.4 O) constitutes from approximately 50% to 90% by weight of the compound.
www.everypatent.com /comp/pat5017370.html   (10271 words)

  
 Catalyst 4.5 Release Notes   (Site not responding. Last check: 2007-10-21)
This specifies the minimum value that the sum of the hydrophobicity values for each atom in a small ring (size 7 or less) has to exceed to be considered a hydrophobe.
This specifies the minimum value that the sum of the hydrophobicity values for each atom in a group has to exceed to be considered a hydrophobe.
This specifies the minimum value that the sum of the hydrophobicity values for each atom in a chain group has to exceed to be considered a hydrophobe.
www.scripps.edu /rc/softwaredocs/msi/catalyst45/RN_cat45.html   (2230 words)

  
 Silanes - Water Repellents and Surface Protection - Dow Corning
Dow Corning® brand water and stain repellent materials are used to hydrophobe and oleophobe surfaces, making them resistant to water and oil ingress.
Pore blockers are further distinguished by their ability to partially or fully fill the surface pores, a capability not shared by hydrophobing agents.
Hydrophobers allow the concrete to breathe and do not interfere with the concrete cure.
www.dowcorning.com /content/silanes/silanessurf   (319 words)

  
 Influence of the Hydrophobe Structure on Composition, Microstructure, and Rheology in Associating Polyacrylamides ...   (Site not responding. Last check: 2007-10-21)
This method is known to lead to multiblock copolymers in which the number and length of the hydrophobic blocks vary with the initial number of hydrophobes per micelle.
Solubility measurements of both types of hydrophobes indicate that the micellar dynamics is not responsible for this behavior, but rather the difference in polarity between the bulk phase and the micellar phase.
The rheological properties of the samples are discussed in terms of copolymer microstructure and type of hydrophobe used (bulkiness, degree of branching, and alkyl chain length).
pubs.acs.org /cgi-bin/abstract.cgi/mamobx/1996/29/i05/abs/ma951178m.html   (261 words)

  
 :: HANKUCK LATICES ::
As it is showed at Fig 3, after neutralization, polymer backbone has solubility in water as changing over hydrophilic chain and hydrophobe chain has a tendency to separate from hydrophilic backbone chain mutually because of the hydrophobic chemical property.
The successive phase outside of the colloid particle is water phase, and the thickening effect of water phase is happened because backbone polymer of thickener which is dissolved in water has high molecular weight.
In addition to this, the thickening effect is added by the association of hydrophobe which extended to the branch.
www.hankuck.co.kr /hisold2.htm   (379 words)

  
 Hydrophobe - Encyclopedia, History, Geography and Biography   (Site not responding. Last check: 2007-10-21)
This page was last modified 16:47, 1 May 2006.
This encyclopedia, history, geography and biography article about Hydrophobe contains research on
Hydrophobe, See also, References, Chemical properties and Biophysics.
www.arikah.net /encyclopedia/Hydrophobic   (285 words)

  
 Description of Catalyst's Predefined Chemical Functions
Because our goal is to assign hydrophobicity to small groups of atoms, our typing system works differently from, say, that of Ghose and Crippen where the goal is to reproduce a partition coefficient for the entire molecule.
In particular, we reduce the hydrophobicity of an atom if there are nearby hydrophilic atoms rather than simply adding an opposing contribution for the hydrophilic atoms.
Description: This specifies the minimum value that the sum of the hydrophobicity values for each atom in a small ring (size 7 or less) has to exceed to be considered a hydrophobe.
www.scripps.edu /rc/softwaredocs/msi/catalyst45/help/FuncRef.doc.html   (1825 words)

  
 Hydrophobe Information Center - Hydrophobe
The term hydrophobic interaction (HI) has been used in the context of several closely related phenomena related to hydrophobic species.
Examples Hydrophobe of hydrophobic molecules include the alkanes, oils, fats, and greasy substances in general.
Aryeh Ben-Na'im Hydrophobic Interaction Plenum Press, New York (ISBN 0-306-40222-X) This chemistry article is a stub.
www.scipeeps.com /Sci-Biochemistry_Topics_G_-_H/Hydrophobe.html   (225 words)

  
 Hydrophile - Wikipedia, the free encyclopedia
A hydrophilic molecule or portion of a molecule is one that is typically charge-polarized and capable of hydrogen bonding, enabling it to dissolve more readily in water than in oil or other hydrophobic solvents.
Hydrophilic and hydrophobic molecules are also known as polar molecules and nonpolar molecules, respectively.
This page was last modified 22:39, 12 March 2006.
en.wikipedia.org /wiki/Hydrophile   (128 words)

  
 Nomenclature
Plotting molecular weight ranges of the hydrophobe (propylene oxide) against the weight-percent of the hydrophile (ethylene oxide) present in each molecule allows property trends of the product structure to be analyzed on the Grid.
The molecular weight of the hydrophobe is approximately 1800 (6 X 300).
Again, hydrophobe molecular weight is plotted against weight percent hydrophile.
www.basf.com /performancechemical/bcperfnomenclature.html   (341 words)

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