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Items from 1 to 14 out of 14 results

article

Dispersing surface-modified imogolite nanotubes in polar and non-polar solvents

Ming Li, Jonathan A. Brant

Journal of Nanoparticle Research > 2018 > 20 > 2 > 1-13

Furthering the development of nanocomposite structures, namely membranes for water treatment applications, requires that methods be developed to ensure nanoparticle dispersion in polar and non-polar solvents, as both are widely used in associated synthesis techniques. Here, we report on a two-step method to graft polyvinylpyrrolidone (PVP), and a one-step method for octadecylphosphonic acid (OPA),...

article

Phytochemical analysis and assessment of in vitro antibacterial activity of non-polar solvent based Camelina seed extracts

Kamal Kumar, Rakshit Pathak

Indian Journal of Plant Physiology > 2016 > 21 > 3 > 255-262

A study was conducted to examine the phytochemical and antibacterial potential of non-polar solvent (hexane, petroleum ether, chloroform, and toluene) based Camelina sativa cv. Calena (EC643910) seed extracts for future investigation into the field of pharmacology, phytochemistry, ethnobotany and other biological actions for drug discovery. Among all tested extracts, hexane (disc 1) showed no inhibition...

article

Evaluation of different solvent mixtures in esterifiable lipids extraction from microalgae Botryococcus braunii for biodiesel production

Pamela Hidalgo, Gustavo Ciudad, Rodrigo Navia

Bioresource Technology > 2016 > 201 > C > 360-364

Non-polar and polar solvents as well as their mixtures were tested for the extraction of microalgae lipids and thus, to evaluate their effect on total and esterifiable lipids extraction yields with potential to be converted to biodiesel. The obtained results show an increase in lipids and esterifiable lipids extraction yields when non-polar and polar solvent mixtures were used. The higher esterifiable...

article

Non-hydrolytic formation of silica and polysilsesquioxane particles from alkoxysilane monomers with formic acid in toluene/tetrahydrofuran solutions

Dylan J. Boday, Stephanie Tolbert, Michael W. Keller, Zhe Li, more

Journal of Nanoparticle Research > 2014 > 16 > 3 > 1-13

Silica and polysilsesquioxane particles are used as fillers in composites, catalyst supports, chromatographic separations media, and even as additives to cosmetics. The particles are generally prepared by hydrolysis and condensation of tetraalkoxysilanes and/or organotrialkoxysilanes, respectively, in aqueous alcohol solutions. In this study, we have discovered a new, non-aqueous approach to prepare...

article

Chromatographic lipophilicity determination using large volume injections of the solvents non-miscible with the mobile phase

Costel Sârbu, Rodica Domnica Naşcu-Briciu, Dorina Casoni, Agata Kot-Wasik, more

Journal of Chromatography A > 2012 > 1266 > Complete > 53-60

A new perspective in the lipophilicity evaluation through RP-HPLC is permitted by analysis of the retention factor (k) obtained by injecting large volumes of test samples prepared in solvents immiscible with mobile phase. The experiment is carried out on representative groups of compounds with increased toxicity (mycotoxins and alkaloids) and amines with important biological activity (naturally occurring...

article

A two-step model for surfactant adsorption at solid surfaces

Rico F. Tabor, Julian Eastoe, Peter J. Dowding

Journal of Colloid And Interface Science > 2010 > 346 > 2 > 424-428

A theoretical model is presented which accounts for two stages of surfactant adsorption onto a solid surface. The model incorporates both mass transfer (diffusion) and attachment terms, making it applicable to systems where mass transport and adsorption may occur on similar timescales. The model is tested against example systems which appear to show two-step adsorption processes, consisting of cationic...

article

Dielectric relaxation studies of methyl cellulose with phenol derivatives in non-polar solvents using time domain reflectometry

P. Mohan Kumar, M. Malathi, P.W. Khirade

Physica B: Physics of Condensed Matter > 2009 > 404 > 21 > 3911-3914

Dielectric relaxation measurements of methyl cellulose with substituted phenols p-cresol, m-cresol and o-cresol mixture in different non-polar solvents CCl ₄ , benzene and 1,4-dioxan for different concentrations over the frequency range of 10MHz–20GHz at 303K have been carried out using Time Domain Reflectometry (TDR). Dielectric parameters such as static permittivity (ε ₀ ) and relaxation...

article

Dielectric relaxation studies of Nylon-11 with phenol derivatives in non-polar solvents using Time Domain Reflectometry

P. Mohan Kumar, M. Malathi

Journal of Molecular Liquids > 2009 > 145 > 1 > 5-7

Dielectric relaxation measurements of Nylon-11 with substituted phenols p-Cresol, m-Cresol and o-Cresol mixture in different non-polar solvents CCl ₄ , benzene and 1,4-dioxan for different concentrations over the frequency range of 10 MHz–20 GHz at 303 K have been carried out using Time Domain Reflectometry (TDR). Dielectric parameters such as static permittivity (ε ₀ ) and relaxation...

article

Efficient preparation of silver nanoplates assisted by non-polar solvents

Lijian Huang, Yueming Zhai, Shaojun Dong, Jin Wang

Journal of Colloid And Interface Science > 2009 > 331 > 2 > 384-388

In the paper, we report an efficient method to prepare high yield (up to 97%) of silver nanoplates. Synthesis of silver nanoplates was carried out in a binary solvent system of N,N-dimethylformamide (DMF) and toluene, in which DMF served as the reductant and polyvinylpyrrolidone (PVP) as the capping agent. By increasing the ratio of toluene to DMF to 7:6, silver nanoplates can be successfully synthesized;...

article

Femtosecond events in the free electron transfer

Ortwin Brede, Sergej Naumov

Radiation Physics and Chemistry > 2007 > 76 > 8-9 > 1229-1230

The ion-molecule reaction between solvent parent radical cations and hetero group-substituted aromatics in non-polar media shows a characteristic product distribution, which depends strongly on the mobility of the substituent. This electron transfer phenomenon seems to reflect femtodynamics of the donor molecule, which is appearing in the nanosecond time range.

article

Monitoring molecule dynamics by free electron transfer

O. Brede, S. Naumov, R. Hermann

Radiation Physics and Chemistry > 2003 > 67 > 3-4 > 225-230

Molecular oscillations take place in the time range of some 10-100fs. In asymmetric molecules, accompanied with rotation and necking motions of molecule parts changes of the electron distribution of the molecular orbitals occur. In phenols the rotation motion of the C-OH bond with a frequency around 10 ¹ ³ Hz causes dramatical electron motions in the molecule. These motions could be monitored...

article

Thermodynamic properties of (1,3 -dioxane, or 1,4-dioxane + a non-polar liquid) atT= 298.15 K; speed of sound, excess isentropic and isothermal compressibilities and excess isochoric heat capacity

Takayo Takigawa, Katsutoshi Tamura

The Journal of Chemical Thermodynamics > 2000 > 32 > 8 > 1045-1055

The speed of sound in six binary mixtures (1,3 -dioxane, or 1,4-dioxane + 2,2,4-trimethylpentane, or benzene, or tetrachloroethene) was measured at T= 298.15 K. Isentropic and isothermal compressibilities and isochoric heat capacity were estimated from the speed of sound by using the excess volume, excess isobaric heat capacity and excess thermal expansivity of the mixtures reported in previous papers...

article

The synthesis of a hydrocarbon-soluble organolithium anionic initiator. A gas–liquid chromatography study of the efficiency of the reaction of s-butyllithium with p-divinylbenzene

Ronald D Sanderson, Guido Costa, Gabriel J Summers, Carol A Summers

Polymer > 1999 > 40 > 19 > 5429-5437

The extent of conversion of the reaction between sec-butyllithium and p-divinylbenzene was evaluated by quantitative gas–liquid chromatography. The reaction of stoichiometric amounts of ultra-high purity sec-butyllithium with pure p-divinylbenzene at 0°C produces an anionic initiator, 1,4-bis(1-lithio-3-methylpentyl)benzene, 2, in essentially quantitative yields, with low concentrations of monofunctional...

article

Excess volumes and excess thermal expansivities for binary mixtures of 2-ethoxyethanol with non-polar solvents at temperatures between 283.15 K and 328.15 K

Fluid Phase Equilibria > 1999 > 156 > 1-2 > 101-114

Measurements of densities between 283.15 K and 328.15 K at 15 K intervals are reported for binary mixtures of 2-ethoxyethanol with non-polar solvents (n-octane, cyclohexane and benzene). Excess volumes and excess thermal expansivities and the pressure derivatives of the enthalpies were estimated therefrom. The excess volumes and temperature derivatives of the excess volumes for all these systems were...

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Keywords

NON-POLAR SOLVENTS (14)
DIELECTRIC PARAMETERS (2)
SUBSTITUTED PHENOLS (2)
TOLUENE (2)
1,4-BIS(1-LITHIO-3-METHYLPENTYL)BENZENE (1)
2-ETHOXYETHANOL (1)
ADSORPTION (1)
AGAR DISC DIFFUSION ASSAY (1)
AGGREGATION (1)
ALKALOIDS (1)
AMINES (1)
ANIONIC POLYMERIZATION (1)
BINARY MIXTURES (1)
BRIDGED SILSESQUIOXANE PARTICLES (1)
CAMELINA SEED (1)
DIFUNCTIONAL INITIATOR (1)
DIOXANE ISOMERS (1)
DMF (1)
ELECTRON TRANSFER (1)
EMULSION (1)
EXCESS THERMAL EXPANSIVITIES (1)
EXCESS VOLUMES (1)
FORMIC ACID (1)
FREE ELECTRON TRANSFER (1)
GAS–LIQUID CHROMATOGRAPHY (1)
HETERO-SUBSTITUTED AROMATICS (1)
HIGH PURITY SEC-BUTYLLITHIUM (1)
IMOGOLITE NANOTUBES (1)
IN VITRO ANTIMICROBIAL ACTIVITY (1)
ISENTROPIC AND ISOTHERMAL COMPRESSIBILITIES (1)
ISOCHORIC MOLAR HEAT CAPACITY (1)
KINETICS (1)
LARGE VOLUME INJECTION (1)
LIPID EXTRACTION (1)
LIPOPHILICITY (1)
METHYL CELLULOSE (MC) (1)
MICROALGAE (1)
MODELING (1)
MOLECULAR OSCILLATIONS (1)
MOLECULE DYNAMICS (1)
MYCOTOXINS (1)
NANOCOMPOSITE MEMBRANES (1)
NON-HYDROLYTIC (1)
NYLON-11 (1)
PARENT IONS (1)
PHENOLS (1)
PHYTOCHEMICALS (1)
POLAR SOLVENTS (1)
POLYVINYLPYRROLIDONE (1)
PRESSURE DERIVATIVES OF ENTHALPIES (1)
RADICAL CATIONS (1)
SILICA (1)
SILICA PARTICLES (1)
SILVER NANOPLATES (1)
SOL–GEL (1)
SPEED OF SOUND (1)
STÖBER PARTICLES (1)
SURFACTANT (1)
TIME DOMAIN REFLECTOMETRY (TDR) (1)
TIME DOMAIN REFLECTOMETRY(TDR) (1)
WATER FILTRATION (1)
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