نتایج جستجو برای: heptane

تعداد نتایج: 1630  

2006
Christopher J. Montgomery Marc A. Cremer Jyh-Yuan Chen Charles K. Westbrook Lourdes Q. Maurice C. J. Montgomery M. A. Cremer J.-Y. Chen C. K. Westbrook L. Q. Maurice

Several reduced chemical kinetic mechanisms for combustion of ethylene and nheptane have been generated using CARM (Computer Aided Reduction Method), a computer program that automates the mechanism-reduction process. The method uses a set of input test problems to rank species by the error introduced by assuming they are in quasi-steady state. The reduced mechanisms have been compared to detail...

Journal: :International journal of pharmaceutics 2012
Yinhe Tan Zhiwen Yang Xin Pan Meiwan Chen Min Feng Lili Wang Hu Liu Ziyun Shan Chuanbin Wu

The objective of this study was to investigate the stability and aerosolization of pressurized metered dose inhalers (pMDIs) containing thymopentin nanoparticles. Thymopentin nanoparticles, fabricated by a bottom-up process, were suspended in hydrofluoroalkane (HFA) 134a together with cineole and/or n-heptane to produce pMDI formulations. The stability study of the pMDIs obtained was carried ou...

Nowadays, the increasing demand for energy in the world is one of the main concerns for energy supply. In fact, the required energy can be obtained by increasing the production rate of fossil fuels such as oil and natural gas. However, improving the efficiency of the equipment and facilities might have a significant impact on production from hydrocarbon resources. With respect to this subject, ...

Journal: :The journal of physical chemistry. B 2006
G Kavitha Chandrabhas Narayana

High-pressure Raman scattering studies at ambient temperature are performed on n-heptane. We observe a liquid-solid transition around 1.5 GPa from the changes in the Raman spectra. This has been reported in earlier works. With increasing pressure, we observe large changes in the Raman modes and the spectra show a distinct change around 7.5 GPa. This marks the solid-solid transition at 7.5 GPa o...

Journal: :The journal of physical chemistry. A 2018
João G S Monteiro André G H Barbosa André M Henriques Pedro H G Neves Roberto S Furtado Rodrigo M Menezes Anderson R Dos Santos Felipe P Fleming

N-Heptane and 2,2,4-trimethylpentane (isooctane) are the key species in the modeling of ignition of hydrocarbon-based fuel formulations. Isooctane is knock-resistant whereas n-heptane is a very knock-prone hydrocarbon. It has been suggested that interconversion of their associated alkylperoxy and hydroperoxyalkyl species via hydrogen-transfer isomerization reaction is the key step to understand...

Journal: :The journal of physical chemistry. B 2010
Sara M Hashmi Abbas Firoozabadi

When oil is mixed with light alkanes, asphaltenes can precipitate out of oil solutions in a multistep process that involves the formation of nano and colloidal scale particles, the aggregation of asphaltene colloids, and their eventual sedimentation. Amphiphilic dispersants can greatly affect this process. The mechanism of the dispersant action in colloidal asphaltene suspensions in heptane has...

Journal: :Physical review. E, Statistical, nonlinear, and soft matter physics 2013
Alexander Lorenz Deña M Agra-Kooijman Natalie Zimmermann Heinz-S Kitzerow Dean R Evans Satyendra Kumar

Structures of the mesophases of five members of the 4-n-alkyl-4'-cyanobiphenyl homologous series (4-n-butyl-4'-cyanobiphenyl to 4-n-octyl-4'-cyanobiphenyl) doped with milled BaTiO_{3} nanoparticles were investigated by x-ray scattering. Clear solutions of each of the 4-n-alkyl-4'-cyanobiphenyls were first prepared in n-heptane and then doped with an n-heptane/nanoparticle dispersion, which led ...

2016
Mahtab Hejazifar Martyn Earle Kenneth R Seddon Stefan Weber Ronald Zirbs Katharina Bica

The design and properties of surface-active ionic liquids that are able to form stable microemulsions with heptane and water are presented, and their promise as reaction media for thermomorphic palladium-catalyzed cross-coupling reactions is demonstrated.

Journal: :Chemical communications 2008
Martin J Hollamby Kieran Trickett Ana Vesperinas Carl Rivett David C Steytler Zoe Schnepp Jon Jones Richard K Heenan Robert M Richardson Otto Glatter Julian Eastoe

Here it is shown that the chemical nature of outer organic surfactant layers, used to stabilize inorganic nanoparticles (NPs), is a key factor controlling solubility in a mixed liquid CO(2)-heptane (10% vol) solvent.

The zinc-cadmium oxide (ZnO-CdO) nanocomposites with different weight percentages of cadmium oxide (CdO) nanoparticles were successfully synthesized by the sonochemical method using zinc and cadmium nitrates as precursors to probe their nano-structured surfaces for the decomposition reactions of chloroethyl phenyl sulfide (CEPS) as a surrogate of sulfur mustard agent simulant. Scanning electron...

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