Tag: 300-400

Ultrastructure of the dentin-adhesive interface after acid-base challenge. was written by Tsuchiya, Satoko;Nikaido, Toru;Sonoda, Hidekazu;Foxton, Richard M;Tagami, Junji. And the article was included in The journal of adhesive dentistry in 2004.Formula: C17H30BrN This article mentions the following:

PURPOSE: To observe the ultrastructure of the dentin-adhesive interface after in vitro sequential challenge by acidic and basic chemicals around adhesive restorations. MATERIALS AND METHODS: Box-shaped cavities were prepared in bovine root dentin and restored as follows: Reactmer Bond and Reactmer Paste (RB/RP), Clearfil SE Bond and Clearfil AP-X (SE/APX), ABF (experimental) and APX (ABF/APX), Single Bond and APX (SB/APX). After the specimens were stored in water for 1 week, the integrity of the bonds tested by sequential immersion were placed in an artificial demineralizing solution (pH 4.5) for 20 min and in 5% NaOCl for 20 min. The specimens were sectioned, polished, then argon-ion etched for 7 min, and gold sputter coated for SEM examination of the dentin-adhesive interface. RESULTS: The morphological results indicated tight bonding between the cavity wall dentin and the adhesive. For the fluoride-releasing restoration, RB/RP, a thick acid-resistant zone was clearly observed adjacent to the restoration; however, the bonding resin, RB, was partially degraded by the acid-base challenge. For SE/APX, ABF/APX and SB/APX, the bonding resins were resistant to the acid-base challenge. With the self-etching adhesive systems, SE and ABF, a thin band of acid-base resistant dentin less than 1 microm thick was observed beneath the hybrid layer. With the wet bonding system, SB, the hybrid layer was partially degraded by the acid-base challenge. CONCLUSION: SEM observation is useful for observing the reactions of adhesives to acid-base challenge. Prevention of secondary caries around a restoration may be influenced by the physical properties of the restorative and adhesive materials, quality of the hybrid layer, and fluoride-release. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Formula: C17H30BrN).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. Formula: C17H30BrN

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Study of polyelectrolyte-ionic surfactant interactions was written by Barany, Sandor;Bader, Imre;Pakhar, Tatyana. And the article was included in Magyar Kemiai Folyoirat in 2002.Quality Control of 1-Dodecylpyridin-1-ium bromide This article mentions the following:

Using viscosity, elec. conductivity, light transmittance and electrophoresis methods, the interactions between cationic/anionic polyelectrolytes of different charge d. and mol. mass and ionic surfactants in aqueous and electrolyte solutions were studied. Strong interactions between components are observed due to electrostatic attraction between oppositely charged polymers and surfactants, which are manifested by a substantial reduction of solution viscosity and light transmittance as well as by a relative decease in conductivity of the systems. With increasing the surfactant content, the formed polyelectrolyte-tenside complexes precipitate and then dissolve again. For highly charged polyelectrolytes a wide destabilization zone is observed and at high surfactant concentrations only partial dissolution of insoluble complexes takes place. In this region the ratio between charges of surfactant and polyelectrolyte reaches 3-4. With increasing the C atom numbers in the surfactant mol., the concentration of the surfactant at which reduction in system viscosity and light transmittance occurs diminishes. This is an evidence of the important role of hydrophobic interactions in binding and cooperation between adsorbed surfactant mols. As a result of operation of these forces also interactions between high mol. anionic polyelectrolytes and anionic surfactants take place. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Quality Control of 1-Dodecylpyridin-1-ium bromide).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridine has a dipole moment and a weaker resonant stabilization than benzene (resonance energy 117 kJ璺痬ol閳? in pyridine vs. 150 kJ璺痬ol閳? in benzene). Pyridine derivatives are also useful as small-molecule 浼?helix mimetics that inhibit protein-protein interactions, as well as functionally selective GABA ligands.Quality Control of 1-Dodecylpyridin-1-ium bromide

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Modeling of the Effects of Ion Specificity on the Onset and Growth of Ionic Micelles in a Solution of Simple Salts was written by Koroleva, Sofia V.;Victorov, Alexey I.. And the article was included in Langmuir in 2014.Reference of 104-73-4 This article mentions the following:

A mol. thermodn. model has been developed that takes into account the effect of ion specificity on the free energy of aggregation. The specificity of salt is reflected by differences in the bare ionic sizes and polarizabilities leading to the difference in the dispersion interaction of ions with the aggregate. The model also contains parameters that characterize the compactness of ionic pairs formed between a mobile ion and surfactant’s headgroup. The values of these parameters show that more chaotropic heads form tighter pairs with chaotropic ions whereas more cosmotropic heads form more compact pairs with cosmotropic ions. The formation of compact pairs in the micelle corona diminishes the preferable curvature of the aggregates and promotes their growth. The model has been applied to aqueous solutions of cationic (alkyltrimethylammonium, alkyldimethylammonium, and alkylpyridinium) and anionic (alkylsulfate and alkylcarboxylate) surfactants in the presence of simple 1:1 salts. With a single set of parameter values, the model reproduces the critical micelle concentration-salinity curves and the sphere-to-rod transitions or the absence of thereof and describes the aggregate growth for different simple salts, in good agreement with experiment In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Reference of 104-73-4).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. The pyridine ring occurs in many important compounds, including agrochemicals, pharmaceuticals, and vitamins. Many analogues of pyridine are known where N is replaced by other heteroatoms . Substitution of one C閳ユ弻 in pyridine with a second N gives rise to the diazine heterocycles (C4H4N2), with the names pyridazine, pyrimidine, and pyrazine.Reference of 104-73-4

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Synthesis and sterilization property of heterocyclic surfactants was written by Wang, Li-yan;Wang, Lei;Qin, Hong-lei;Yu, Ting-ting;Xu, Qun;Ma, Wen-hui;Wang, Xue-dong. And the article was included in Huaxue Shijie in 2012.Recommanded Product: 104-73-4 This article mentions the following:

A series of heterocyclic surfactants were prepared with pyridine and 1-bromoalkanes (bromooctane, bromodecane, bromododecane or bromotetradecane). The best reaction conditions for synthesis of the target products were optimized by orthogonal test program. The reaction temperature was 90鎺矯, the reaction time was 5 h, and the mole ratio of bromoalkane and pyridine was 1 : 1. The products were characterized by IR and ¹H NMR. The target products’ sterilization properties for colibacillus, staphylococcus aureus, bacillus subtilis were determined The results showed that the heterocylic surfactants had excellent sterilization properties for the above three kinds of bacteria. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Recommanded Product: 104-73-4).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. In contrast to benzene, Pyridine’s electron density is not evenly distributed over the ring, reflecting the negative inductive effect of the nitrogen atom. One of the examples of pyridines is the well-known alkaloid lithoprimidine, which is an A3 adenosine receptor antagonist and N,N-dimethylaminopyridine (DMAP) analog, commonly used in organic synthesis.Recommanded Product: 104-73-4

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Interactions between quaternary ammonium surfactants and polyethylenimine at high pH in film forming systems was written by Jaber, Robben;Wasbrough, Matthew J.;Holdaway, James A.;Edler, Karen J.. And the article was included in Journal of Colloid and Interface Science in 2015.Application of 104-73-4 This article mentions the following:

Film formation and film structure in films formed on solutions of cationic surfactants with polyethylenimine is affected by the surfactant structure, including both the tail length and the nature of the headgroup, which alter the micelle properties. A series of cationic surfactants were synthesized and conductivity measurements were used to compare the critical micelle concentrations for these surfactants and their behavior with and without polyethylenimine at high pH. Small angle neutron scattering measurements were used to characterize the size and shape of the micelles in the presence and absence of the polymer. Film formation between polyethylenimine and the various surfactants was trialled, and the interfacial film structures measured using neutron reflectivity. Film formation is shown to depend on surfactant tail length, with thicker films forming for surfactants with longer hydrophobic tails. The surfactant headgroup structure affects counterion binding to the micelles, and in the case of the aromatic headgroups, the headgroup affects the extent of micellar growth when polymer is added. Films with the greatest mesostructural ordering were grown using hexadecylpyridinium bromide surfactants. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Application of 104-73-4).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridines are an important class of heterocycles and occur in polysubstituted forms in many naturally occurring biologically active compounds, drug molecules and chiral ligands. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. Application of 104-73-4

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Ionic liquids as dispersing agents of graphene nanoplatelets in poly(methyl methacrylate) composites with microwave absorbing properties was written by Caldas, Camila Mouta;Soares, Bluma Guenther;Indrusiak, Tamara;Barra, Guilherme Mariz Oliveira. And the article was included in Journal of Applied Polymer Science in 2021.Category: pyridine-derivatives This article mentions the following:

Graphene nanoplatelets (GNP) is noncovalently functionalized with imidazolium-, pyridinium-, and vinyl-pyridinium-based ionic liquids containing bromide or bis(trifluoromethyl-sulfonyl)imide (TFSI) as the counteranions, and used to prepare poly (Me methacrylate) (PMMA) nanocomposites by solution casting approach followed by compression molding technique. The PMMA composites loaded with 1.9 and 1.8 wt% of GNP in PMMA/GNP composite and PMMA/GNP/ionic liquids, resp., were characterized by melting viscosity, thermogravimetric anal. and a.c. elec. conductivity (锜?sub>AC). The microwave absorption properties at the X-band (8.2-12.4 GHz) frequency were measured for systems with 1 mm thickness using the metal-backed configuration. PMMA nanocomposites loaded with GNP/N-dodecyl-4-vinyl-pyridinium. TFSI (C₁₂ViPy.TFSI) displayed higher thermal stability and higher 锜?sub>AC. This system also presented the best response in terms of microwave absorbing properties, with min. reflection loss (RL) of around -6 dB at 8.7 GHz. Triple layered composite structures with layers of different conductivities and different stacking orders were also investigated in terms of reflection loss. Broadband absorption with min. RL 閳?-10 dB (90% of electromagnetic attenuation) in the frequency between 10.2 and 12.4 GHz and better absorbing effectiveness were observed for the PMMA/GNP-PMMA/GNP/C₁₂ViPy. TFSI-PMMA/GNP/C₁₂ViPy. Br triple-layered system with 3 mm thickness. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Category: pyridine-derivatives).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridine is diamagnetic and has a diamagnetic susceptibility of 閳?8.7 鑴?10閳? cm3璺痬ol閳?.The molecular electric dipole moment is 2.2 debyes. The standard enthalpy of formation is 100.2 kJ璺痬ol閳? in the liquid phase and 140.4 kJ璺痬ol閳? in the gas phase. Pyridine, its benzo and pyridine-based compounds play diverse roles in organic chemistry. Pyridine-based materials are valued for their optical and physical properties as well as their medical potential. Category: pyridine-derivatives

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Adsorption of cationic and nonionic surfactants on a SiO₂ surface from aqueous solutions: 1. Adsorption of dodecylpyridinium bromide and Triton X-100 from individual solutions was written by Kharitonova, T. V.;Ivanova, N. I.;Summ, B. D.. And the article was included in Colloid Journal in 2005.Recommanded Product: 104-73-4 This article mentions the following:

Adsorption of cationic surfactant dodecylpyridinium bromide and nonionic surfactant Triton X-100 from aqueous solutions on the surface of SiO₂ particles was studied at various pH values (3.6, 6.5, and 10). The data on the adsorption are compared with the data on the wetting of quartz plates by solutions of these surfactants. Adsorption of both studied surfactants on the SiO₂ surface is greatly dependent on solution pH. The mechanism of adsorption of the cationic surfactant is changed when passing to the alk. pH region. Triton X-100 does not demonstrate a substantial change in the adsorption mechanism in the pH range from 3.6 to 10. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Recommanded Product: 104-73-4).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridine has a conjugated system of six 锜?electrons that are delocalized over the ring. The molecule is planar and, thus, follows the H鐪塩kel criteria for aromatic systems. Many analogues of pyridine are known where N is replaced by other heteroatoms . Substitution of one C閳ユ弻 in pyridine with a second N gives rise to the diazine heterocycles (C4H4N2), with the names pyridazine, pyrimidine, and pyrazine.Recommanded Product: 104-73-4

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Micellar counterion binding for alkylpyridinium iodides probed by N-sulfopropylacridinium fluorescence quenching was written by Asakawa, Tsuyoshi;Iriyama, Keisuke;Ohta, Akio;Miyagishi, Shigeyoshi. And the article was included in Journal of Oleo Science in 2004.Application In Synthesis of 1-Dodecylpyridin-1-ium bromide This article mentions the following:

Fluorescence quenching using N-sulfopropylacridinium (SPA) makes it possible to determine the degree of micellar counterion binding (灏? of alkylpyridinium iodide in aqueous solution But with quinoline derivatives as a halide-sensitive fluorescence probe, this was not possible. Fluorescence was quenched by iodide ions as indicated by linear Stern-Volmer plots, the slope of which was noted to decrease beyond cmc (critical micelle concentration) owing to micellar counterion binding with SPA excitation at 416 nm. The slope was found to significantly increase beyond cmc with SPA excitation at 357 nm. The abrupt quenching was due to absorption bands resulting from charge-transfer interactions of pyridinium and iodide ions. SPA fluorescence was quenched by iodide and bromide ions but virtually unaffected by nitrate or sulfate ions. Selective counterion binding of iodide ions is thus shown to be detectable. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Application In Synthesis of 1-Dodecylpyridin-1-ium bromide).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. The pyridine ring occurs in many important compounds, including agrochemicals, pharmaceuticals, and vitamins. Many analogues of pyridine are known where N is replaced by other heteroatoms . Substitution of one C閳ユ弻 in pyridine with a second N gives rise to the diazine heterocycles (C4H4N2), with the names pyridazine, pyrimidine, and pyrazine.Application In Synthesis of 1-Dodecylpyridin-1-ium bromide

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Degree of counterion binding of alkylpyridinium halide micelles: its relation to micelle shape and size was written by Fujio, Katsuhiko;Maruyama, Yasuhide;Uzu, Yuhei. And the article was included in Journal of Oleo Science in 2005.Electric Literature of C17H30BrN This article mentions the following:

From electromotive force measurements with surfactant and halide ion-selective electrodes, the authors obtained the degree of counterion binding (β) of dodecylpyridinium bromide (DPB) and iodide (DPI) and tetradecylpyridinium bromide (TPB) micelles in aqueous Na halide solutions with concentrations of 0-20 mM. Under a geometrical consideration the micelle shapes and the surface densities of head group (s^-1) of these micelles were deduced from aggregation numbers evaluated from their relations to the added salt concentration previously reported. The spherical micelles of TPB having the shape of an oblate ellipsoid had a constant β, 0.76, independently of s^-1. In the case of the spherical micelles of DPB, β is 0.79 for sphere-shaped micelles and 0.82 for ellipsoidal ones. For DPI the authors obtained β values of 0.84 and 0.99 for the spherical micelles with the shape of an oblate ellipsoid and the rodlike micelles, resp. From these dependences of β on micelle shape and s^-1, β of micelles studied increases in the order of sphere-shaped < oblately ellipsoidal < rodlike micelles but is independent of the micelle size unless the micelle shape changes. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Electric Literature of C17H30BrN).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. The ring atoms in the pyridine molecule are sp2-hybridized. The nitrogen is involved in the π-bonding aromatic system using its unhybridized p orbital. The lone pair is in an sp2 orbital, projecting outward from the ring in the same plane as the σ bonds. Pyridine derivatives are also useful as small-molecule α-helix mimetics that inhibit protein-protein interactions, as well as functionally selective GABA ligands.Electric Literature of C17H30BrN

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem

Direct Electrochemistry of Horseradish Peroxidase Immobilized in a Low Molecular Weight Gel was written by Hu, Yan;Sun, Yanwen;Lu, Lu;Huang, Xirong. And the article was included in Chinese Journal of Chemistry in 2014.Application of 104-73-4 This article mentions the following:

The ternary system of dodecylpyridinium bromide (DDPB)/acetone/H₂O with appropriate composition can form a gel spontaneously and the gel is stable in hydrophobic ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate ([Bmim]PF₆). Based on the gelation phenomenon we observed, the low mol. weight gelator (LMWG) was first tried to immobilize horseradish peroxidase (HRP) on glassy carbon electrode (GCE). The scanning electron microscope (SEM) images, the UV-Vis spectra and the bioactivity measurement indicate that the gel is suitable for the immobilization of HRP. The direct electrochem. of the HRP-gel modified GCE (HRP-gel/GCE) in [Bmim]PF₆ shows a pair of well-defined and quasi-reversible redox peaks with the heterogeneous electron transfer rate constant (k_s) being 14.4 s^-1, indicating that the direct electron transfer between HRP and GCE is fast. The HRP-gel/GCE is stable and reproducible. Also the electrode exhibits good electrocatalytic effect on the reduction of trichloroacetic acid (TCA), showing good promise in bioelectrocatalysis. In the experiment, the researchers used many compounds, for example, 1-Dodecylpyridin-1-ium bromide (cas: 104-73-4Application of 104-73-4).

1-Dodecylpyridin-1-ium bromide (cas: 104-73-4) belongs to pyridine derivatives. Pyridine has a conjugated system of six π electrons that are delocalized over the ring. The molecule is planar and, thus, follows the Hückel criteria for aromatic systems. Pyridine derivatives are also useful as small-molecule α-helix mimetics that inhibit protein-protein interactions, as well as functionally selective GABA ligands.Application of 104-73-4

Referemce:
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem