A purified alkaline thermo-tolerant bacterial lipase from Bacillus cereus MTCC 8372 was immobilized on a Poly (MAc-co-DMA-cl-MBAm) hydrogel. The hydrogel showed approximately 94% binding capacity for lipase. The immobilized lipase (2.36 IU) was used to achieve esterification ofmyristic acid and isopropanol in n-heptane at 65 degrees C under continuous shaking. The myristic acid and isopropanol ...

In this work has been proposed a numerical scheme with the aim of simulate the coalescence process between water drops immersed in a continuous phase (n-heptane). This numerical scheme is based in the Finite Volume method and two different values for the initial velocity of the drops were chosen. Depending of the initial velocity of collision some scenarios emerge, such as: permanent coalescenc...

A numerical model is used to simulate the fingering and splashing of a droplet impacting a solid surface. A methodology is presented for perturbing the velocity of fluid near the solid surface at a time shortly after impact. Simulation results are presented of the impact of molten tin, water, and heptane droplets, and compared with photographs of corresponding impacts. Agreement between simulat...

l.OOg (2.55 mol) ~rylen~tetracarboxyli~-3,4:9,10-bisanhydride and 0.69 g (6.0mol) 3-heptylamine give 1.01 g (67%). --m.p. > 360”C-R, (silica gel/CHCl,)=0.40.-i.r. (KBr): v=2959cm-‘s, 2931s, 2872m, 1698s, 1658s, 1594s, 1579s, 1508w, 1485w, 1460m, 1435m, 1406s, 1380m, 1338s, 1253s, t209m, 1193m, 1177w, 112Sw, 1097m, 962~. 94Ow, 852m, 81Os, 792w, 783w, 747s, 617w.-u.v-vis (CHCI,): 1 nlax (&)=457nm...

Homogeneous and inhomogeneous ignition modes of n-heptane were studied using high-speed imaging in a high-pressure shock tube (HPST). n-Heptane, fuel with strong negative temperature coefficient (NTC) behavior, was mixed 4%-21% oxygen argon or nitrogen ignited over wide range (700–1250 K) at elevated pressures (> 10 atm). Ultraviolet (UV) images OH* emission captured through sapphire shock-tube...

This paper summarizes the first results from isolated droplet combustion experiments performed on the International Space Station (ISS). The long durations of microgravity provided in the ISS enable the measurement of droplet and flame histories over an unprecedented range of conditions. The first experiments were with heptane and methanol as fuels, initial droplet droplet diameters between 1.5...

Low-temperature combustion is a promising strategy for reducing pollutant formation in internal engines. However, there lack of understanding how the chemistry governing differences ignition between low-temperature and conventional affects emission rates physicochemical properties particulate matter (aerosols). Here, we conducted experiments an atmospheric-pressure reactor controlled at constan...

Large-eddy simulations with a transported probability density function model coupled finite-rate chemistry is applied to study the ignition process of an n-heptane spray in constant volume chamber premixed methanol-air atmosphere under conditions relevant reactivity controlled compression (RCCI) engines. Three reacting cases initial equivalence ratio (?m) ranging from 0 0.3 are investigated at ...

Gold nanoparticle (Au NP) mirrors, which exhibit both high reflectance and electrical conductance, were self-assembled at a [heptane + 1,2-dichloroethane]/water liquid/liquid interface. The highest reflectance, as observed experimentally and confirmed by finite difference time domain calculations, occurred for Au NP films consisting of 60 nm diameter NPs and approximate monolayer surface covera...

Monodisperse cobalt nanoparticles (NPs) are synthesized via a high-temperature thermal decomposition method in the presence of oleic acid and triphenylphosphine. The as-synthesized NPs are stable against further deep oxidation when they are kept in heptane (C7H16). Time-dependent x-ray photoelectron spectroscopy studies indicate that the oxidation of the as-synthesized cobalt NPs by air is slow...