Search results for "Colloid"

showing 10 items of 1288 documents

Kinetik und Molekulargewichtsverteilung eines anionischen Polymerisationsprozesses mit momentanem Start bei simultanem Monomerabbruch

1973

Die Kinetik und die Molekulargewichtsverteilung wird fur einen anionischen Polymerisationsprozes mit einem momentanen Startschritt und mit simultanem Monomerabbruch berechnet. Ein derartiger Polymerisationsablauf ist bei der anionischen Polymerisation von Methylmethacrylat in polaren Losungsmitteln zu erwarten. — Die Molekulargewichtsverteilung geht mit steigendem Monomerabbruch in eine SCHULZ-FLORY-Verteilung uber. The kinetics and the molecular weight distribution are calculated for an anionic polymerization with rapid initiation and simultaneous deactivation by the monomer. Such a process is to be expected for the anionic polymerization of methylmethacrylate in polar solvents. — The mole…

chemistry.chemical_compoundColloid and Surface ChemistryMonomerAnionic addition polymerizationPolymers and PlasticsPolymerizationchemistryKineticsPolymer chemistryMaterials ChemistryMolar mass distributionPhysical and Theoretical ChemistryColloid and Polymer Science
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Monomere und polymere Succinimidoester von ω-Methacryloylaminosäuren, ihre Darstellung und ihre Reaktion mit Aminen

1978

Mit der in dieser Arbeit beschriebenen Synthese von ω-Methacryloylaminosaure-succinimidoestern (1) wurden Monomere erhalten, die leicht mit Methacrylamid copolymerisiert werden konnten. Die entstandenen Copolymeren, die als Trager fur Enzyme und Pharmaka verwendet werden konnen, tragen die selektiv mit Aminen reagierende Succinimidoester-Gruppe an einem “Spacerarm”. Die Reaktionsfahigkeit der neuen Monomeren gegenuber verschiedenen Aminen wurde untersucht. The synthesis of succinimido esters of ω-methacryloylaminocarboxylic acids affords monomers which can easily be copolymerized with methacrylamide. The resulting copolymers have a succinimido ester group fixed on a “spacer arm”, which reac…

chemistry.chemical_compoundColloid and Surface ChemistryMonomerPolymers and PlasticsChemistryPolymer chemistryMaterials ChemistryCopolymerMethacrylamideReactivity (chemistry)Physical and Theoretical ChemistryColloid and Polymer Science
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Ab Initio Study on the Mechanism of Tropospheric Reactions of the Nitrate Radical with Haloalkenes:  Chloroethene

2000

chemistry.chemical_compoundColloid and Surface ChemistryNitratechemistryComputational chemistryAb initioGeneral ChemistryBiochemistryCatalysisMechanism (sociology)Journal of the American Chemical Society
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Darstellung und spektroskopische Analyse von Oligo{[4-(1,1,3,3-tetramethylbutyl) (bzw. 4-octyl)2-hydroxy-1,3-phenylen]methylen}en und ihrer Ausgangsv…

1978

4-(1,1,3,3-Tetramethylbutyl)phenol und 4-Octylphenol, erhalten durch Friessche Verschiebung der entsprechenden Phenylester und anschliesende Reduktion der Carbonylgruppe, wurden in ortho-Stellung monobromiert und mit Formaldehyd hydroxymethyliert. Aus diesen Verbindungen konnten sechs 2,2′-Methylendiphenole (2a–f) sowie sieben 2,6-Bis(2-hydroxybenzyl)phenole (3a–g) dargestellt werden, die in 4-Stellung zu den phenolischen Hydroxygruppen Methyl-, 1,1,3,3-Tetramethylbutyl- und Octyl-Substituenten in verschiedenen Verhaltnissen enthalten. Die IR- und 1H-NMR-spektroskpischen Analysen bestatigten die angegebenen Strukturen der dargestellten phenolischen Mehrkernverbindungen. 4-(1,1,3,3-Tetrameth…

chemistry.chemical_compoundColloid and Surface ChemistryPolymers and PlasticsChemistryFries rearrangementPolymer chemistryMaterials ChemistryFormaldehydePhenolPhysical and Theoretical ChemistryCarbonyl groupMedicinal chemistryColloid and Polymer Science
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Darstellung und charakterisierung von einigen neuen bis(1-phenylvinyl)-verbindungen

1974

Einige neue Bis(1-phenylvinyl)-Verbindungen (1b, c und 2a–d) wurden aus den entsprechenden Diacetylverbindungen und Phenylmagnesiumbromid dargestellt. Ihre IR-, NMR-und Massenspektren werden diskutiert. Some new bis(1-phenylvinyl) compounds (1b, c and 2a–d) were prepared from the corresponding diacetyl compounds and phenyl magnesium bromide. Their IR, NMR and mass spectra are discussed.

chemistry.chemical_compoundColloid and Surface ChemistryPolymers and PlasticsChemistryMagnesium bromidePolymer chemistryMaterials ChemistryMass spectrumPhysical and Theoretical ChemistryMedicinal chemistryDiacetylDie Makromolekulare Chemie
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A bis-exTTF macrocyclic receptor that associates C60 with micromolar affinity

2010

An exTTF-based macrocyclic receptor that associates C(60) with a binding constant10(6) M(-1) in chlorobenzene at room temperature is described. This represents an improvement of 3 orders of magnitude with respect to the previous examples of exTTF-based receptors and one of the highest binding constants toward C(60) reported to date.

chemistry.chemical_compoundColloid and Surface ChemistryStereochemistryChemistryChlorobenzeneGeneral ChemistryReceptorBiochemistryBinding constantCatalysisOrders of magnitude (mass)
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Vitrification in restricted geometry: dry films of colloidal particles

2007

We prepared dry films of colloidal particles from surfactant co-stabilized polystyrene and poly(methyl methacrylate) latex spheres of moderate polydispersity. The film thickness was varied from monolayer to some 20 μm. The average structure and the influence of polydispersity was analyzed by small-angle X-ray scattering. An analysis of local microscopic structures was performed by force microscopy on the least polydisperse sample. Irrespective of the thickness, we observe the formation of only short-ranged order which is rather pronounced but changes its qualitative character in the vicinity of the substrate. The observations suggest a bulk structure of small, defect-rich and stacking fault…

chemistry.chemical_compoundColloidMaterials sciencechemistryScatteringChemical physicsSmall-angle X-ray scatteringDispersityMonolayerPolymer chemistryParticlePolystyreneHard spheres
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Cation-induced self-assembly of an amphiphilic perylene diimide derivative in solution and Langmuir–Blodgett films

2015

Abstract A novel amphiphilic perylenetetracarboxylic diimide (PDI) derivative, N-(4′-benzo-15-crown-5-ether)-N-hexyl-1,7-di(4-tert-butyl-phenoxy)perylen-3,4,9,10-tetracarboxylic diimide (15C5PDI), has been synthesized and characterized. Dimerization of 15C5PDI is induced in CHCl 3 solution with the present of K + , resulting in the formation of the slipped co-facial J -aggregates, as revealed by absorption and fluorescence spectroscopies. Analysis of the surface pressure–area ( π – A ) isotherms and spectral change for the monolayer formed at the air/water interface, disclosed that 15C5PDI molecules adopted the H -type aggregation mode with a face-to-face configuration and edge-on orientati…

chemistry.chemical_compoundCrystallinityCrystallographyColloid and Surface ChemistryAqueous solutionchemistryDiimideMonolayerOrganic chemistryMoleculeAbsorption (chemistry)Langmuir–Blodgett filmPeryleneColloids and Surfaces A: Physicochemical and Engineering Aspects
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CO2 switchable nanoparticles: reversible water/organic-phase exchange of gold nanoparticles by gas bubbling

2013

Gold nanoparticles capped with oleylamine can be effectively transferred from an organic solvent to water in the presence of an acetamidine surfactant by CO2 bubbling and then effectively reverted back to the organic phase by N2 bubbling.

chemistry.chemical_compoundPulmonary surfactantChemistryOleylamineColloidal goldGeneral Chemical EngineeringOrganic solventPhase (matter)Inorganic chemistryfood and beveragesNanoparticleGeneral ChemistryRSC Advances
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PLASMOGENY, A NEW SCIENCE OF THE ORIGIN OF LIFE

2014

The Church has always hampered the progress of Mankind so as to retain its hold over awareness, which is the basis of secular exploitation of the people.

chemistry.chemical_compoundchemistryAbiogenesisColloidal silicaInorganic chemistrySodium silicatePotassium silicatePotassium chromate
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