Category: 1119-97-7

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Photochemisch schaltbare Phasentrennung in hydrophob modifizierten Poly(acrylamid)/Tensid-Systemen

Stichworte: trans-cis-Isomerisierung * Phasentrennung * Tenside * Poy(acrylamide)

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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BIODEGRADATION OF ALKYLTRIMETHYLAMMONIUM SALTS IN ACTIVATED SLUDGE

Trimethylamine, dimethylamine and methylamine (actually existing as a salt form in the culture medium) were identified as the intermediates of alkyltrimethylammonium salts in activated sludge obtained from a municipal sewage treatment plant. It was considered that the quaternary ammonium salts with long alkyl chains were degraded to tertiary amine by N-dealkylation at the first stage of the biodegradation pathway. The tertiary amine formed in this pathway rapidly disappeared. In the activated sludge, biodegradabilities based on biochemical oxygen consumption and dissolved organic matter were 7.2-53.7 percent and 97.4-100 percent, respectively. These results and the disappearance of intermediates as described above indicate that long chain alkyltrimethylammonium salts are ultimately biodegradable.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Catalysts function by providing an alternate reaction mechanism that has a lower activation energy than would be found in the absence of the catalyst. In some cases, the catalyzed mechanism may include additional steps.In a article, 1119-97-7, molcular formula is C17H38BrN, introducing its new discovery. Product Details of 1119-97-7

Molecular aggregation of alkyltrimethylammonium bromide and alcohol in the solid state

Alkyltrimethylammonium bromide CnH2n+1N+ Me3Br- (1, n =10, 12, 14, 16 and 18) and primary alcohol CmH2m+1OH (2, m = 8-18) were found to form 1:1 crystalline complexes which show clear melting points. Separation of primary alcohol from a mixture with secondary alcohol was achieved very efficiently by complexation with ammonium salts.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Electric Literature of 1119-97-7, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.1119-97-7, Name is MitMAB, molecular formula is C17H38BrN. In a Article£¬once mentioned of 1119-97-7

Spontaneous formation of gamma-hydroxybutyric acid from gamma-butyrolactone in tap water solutions

The spontaneous conversion of gamma-butyrolactone (GBL) to gamma-hydroxybutyric acid (GHB) in seven different Swedish tap waters was investigated. The waters used in the study were selected to represent the diversity among Swedish tap waters as well as possible, which was enabled by principal component analysis (PCA) of a number of water quality parameters.GBL solutions (5, 25 and 50% v/v) were prepared in each of the tap waters and in deionized water and the formation of GHB was followed over time. The GHB quantifications were made using a CZE method, employing a carrier electrolyte consisting of 25. mM benzoic acid, 54. mM tris(hydroxymethyl)aminomethane (Tris) and 1.7. mM tetradecyltrimethylammonium bromide (TTAB), which was developed as a part of the current study.Data evaluation showed that the formation of GHB was largely dependent on the type of tap water. For example, there was a negative correlation between the kinetics of the GHB formation and the alkalinity of the tap waters (r2=0.990). This could be explained by a faster decrease in pH in the waters with low buffering capacity (i.e. low alkalinity), which catalysed the hydrolysis of GBL. Equilibrium was reached after 40-250 days depending on the initial GBL concentration and the type of tap water. The level of the equilibrium appeared to be dependent on the initial GBL concentration and ranged from 26 to 37%.Gained knowledge on the levels of the GHB/GBL equilibrium and the kinetics of the formation of GHB in tap water solutions of GBL, including the influence of the tap water quality, may be useful information for casework with the GHB/GBL problem in focus.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

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Self-organization in complexes of polyacids with oppositely charged surfactants

Formation and structure of water-soluble complexes of alkyltrimethylammonium bromide homologues (AlkTAB) with poly(acrylic acid) (PA) of different polymerization degrees at pH 5.7 have been examined by elastic and quasi-elastic laser light-scattering and high-speed sedimentation technique. It was experimentally shown that generation of intramolecular micellar phase is the necessary condition for formation of PA-AlkTAB complexes. Minimum aggregation number of the surfactant ions in the complex micelle was found to be close to that of the surfactant micelles in polymer-free solution. The structure of the polyelectrolyte-surfactant complexes (i.e. a phase state of the complex, conformation of the polyion coil and the surfactant ion aggregation number) was shown to be largely determined by PA polymerization degree. Copyright (C) 1999 Elsevier Science B.V.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Synthetic Route of 1119-97-7, Catalysts are substances that increase the reaction rate of a chemical reaction without being consumed in the process. 1119-97-7, Name is MitMAB, molecular formula is C17H38BrN. In a Article£¬once mentioned of 1119-97-7

Chitosan-CTAB: An Efficient Aqueous Micellar System for the Sequential One-Pot Synthesis of Highly Functionalized 2-Amino-4H-Pyrans

A new high yielding protocol has been developed for the convenient and rapid synthesis of 2-amino-4H-pyrans by one-pot sequential reaction of aldehydes, malononitrile and cyanoketones in aqueous micellar medium using chitosan as an efficient heterogeneous, biodegradable and reusable green catalyst. Mild conditions with excellent conversions, cost effectiveness, short reaction times, environmental friendliness, and operational simplicity are noteworthy advantages of this method. The micellar catalytic system can be reused several times without any noticeable decrease in its activity.

Sometimes chemists are able to propose two or more mechanisms that are consistent with the available data. Synthetic Route of 1119-97-7, If a proposed mechanism predicts the wrong experimental rate law, however, the mechanism must be incorrect.Welcome to check out more blogs about 1119-97-7, in my other articles.

Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Synthetic Route of 1119-97-7, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.1119-97-7, Name is MitMAB, molecular formula is C17H38BrN. In a Article£¬once mentioned of 1119-97-7

Synthesis and characterization of new silica membranes using template-sol-gel technology

The sol-gel polymerization process and template technology were used to prepare silica-alumina asymmetric membrane. The FTIR and 29Si-NMR results showed that the silica polymers were formed and the degree of branching depended on the aging time of polymeric sols. Silica membranes were characterized using DTA, TGA, SEM and EDX techniques. Nitrogen physisorption tests revealed that the surface area of the membrane increases significantly around 10-folds when template is used. The average pore size of the silica membrane increases by a factor of 1.5-3 when a template is added. Changing the type and concentration of template, as well as molar ratio of the precursors alter the final characteristics of the membrane. The permeation data on alumina support showed that the gas permeation through the support was controlled by viscous flow model. The H2 permeance of free surfactant template membrane (2.09 ¡Á 10- 6 mol / m2 s Pa) was increased approximately 2 times for new templated membrane (4.2 ¡Á 10- 6 mol / m2 s Pa) at 400 {ring operator} C. Permselectivities of H2 / CH4 (149) and H2 / CO2 (15.5) were obtained for free template membrane and 135 and 35, respectively, for templated membrane at 400 {ring operator} C.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Related Products of 1119-97-7, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1119-97-7, Name is MitMAB, molecular formula is C17H38BrN. In a Article£¬once mentioned of 1119-97-7

Influence of ionic surfactants on separation of liquid – Liquid dispersions

The effect of anionic and cationic surfactants on the separation of a dispersion of a model oil in water is experimentally investigated. As expected, the presence of an anionic or cationic surfactant alone always increases the separation time. However, mixing a dispersion containing an anionic surfactant with a dispersion containing a cationic surfactant significantly reduces the separation time. In both cases the hydrocarbon chain is present in the oil phase with the charged hydrophilic head at the interface in the water phase. The attractive force between the oil drops containing the negatively charged anionic surfactant and the oil drops containing the positively charged cationic surfactant leads to rapid coalescence and separation of the oil in water dispersion. The concentration of the anionic and cationic surfactants are chosen to give the same separation time with identical sedimentation and coalescence profiles. A separation time of 350 s is obtained for a model oil dispersed in water. This time is significantly increased when the dispersion contained an anionic surfactant alone or a cationic surfactant alone. However, mixing these two dispersions reduced the separation time to less than half that for the pure system.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Synthetic Route of 1119-97-7, The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.1119-97-7, Name is MitMAB, molecular formula is C17H38BrN. In a Article£¬once mentioned of 1119-97-7

Pseudomonas putida Delta9-fatty acid desaturase: Gene cloning, expression, and function in the cationic surfactants stress

Pseudomonas putida counteract the fluidizing effect of cationic surfactants decreasing the content of membrane unsaturated fatty acid (UFA). A Delta9-fatty acid desaturase gene (desA) from P. putida was isolated, cloned, and successfully expressed in Escherichia coli, a Delta9 desaturase deficient organism. desA consists of 1185 bp and codes for 394 amino acids. The deduced amino acid sequence reveals three histidine clusters and a hydropathy profile, typical of membrane-bound desaturases. Validating desA expression in E. coli cells, the amount of palmitoleic acid increased from 2.05 to 7.36%, with the concomitant increase in membrane fluidity (fluorescence polarization value decrease from 0.13 ¡À 0.03 to 0.09 ¡À 0.02). Also, when DesA activity was assayed in vivo, the percentage of UFA obtained from exogenous palmitic acid [1-14C] increased 10-fold. In contrast, when cells expressing desA were exposed 15 min at sublethal concentration of cationic surfactants, the amount of UFA was 82% lower than that detected in cells non-exposed. Thus, the decrease in UFA content to counteract the fluidizing effect of cationic surfactants can be correlated with reduction of DesA activity.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI

Electric Literature of 1119-97-7, A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 1119-97-7, Name is MitMAB, molecular formula is C17H38BrN. In a Patent£¬once mentioned of 1119-97-7

FOAM FORMING COMPOSITIONS COMPRISING A PARTICULATE INORGANIC MATERIAL

The present invention relates to aqueous compositions for forming a foam, comprising a surfactant and a particulate inorganic material, and optionally one or more polymers, such as soil conditioning polymers, and/or viscosity increasing polymers. The present invention further relates to the use and application of said aqueous compositions.

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Reference£º
Metal catalyst and ligand design,
Ligand Template Strategies for Catalyst Encapsulation – NCBI