Unbranched n-Alkanes

Lüttschwager, Nils Olaf Bernd

doi:10.1007/978-3-319-08566-1_4

Cited by 3 publications

(1 citation statement)

References 97 publications

(209 reference statements)

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“…This laser source results in a stronger Raman signal and, in our case, a tolerable fluorescence background. The excitation intensity I is proportional to the fourth power of the frequency f ( I ∝ λ ex –4 ). Thus, a 4.74 times higher intensity can be achieved using a 532 nm frequency-doubled Nd:YAG laser instead of the commonly used 785 nm laser diode.…”

Section: Resultsmentioning

confidence: 99%

Highly Sensitive Raman Spectroscopy with Low Laser Power for Fast In-Line Reaction and Multiphase Flow Monitoring

et al. 2016

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In process analytics, the applicability of Raman spectroscopy is restricted by high excitation intensities or the long integration times required. In this work, a novel Raman system was developed to minimize photon flux losses. It allows specific reduction of spectral resolution to enable the use of Raman spectroscopy for real-time analytics when strongly increased sensitivity is required. The performance potential of the optical setup was demonstrated in two exemplary applications: First, a fast exothermic reaction (Michael addition) was monitored with backscattering fiber optics under strongly attenuated laser power (7 mW). Second, high-speed scanning of a segmented multiphase flow (water/toluene) with submicroliter droplets was achieved by aligning the focus of a coaxial Raman probe with long focal length directly into a perfluoroalkoxy (PFA) capillary. With an acquisition rate of 333 Raman spectra per second, chemical information was obtained separately for both of the rapidly alternating phases. The experiment with reduced laser power demonstrates that the technique described in this paper is applicable in chemical production processes, especially in hazardous environments. Further potential uses can be envisioned in medical or biological applications with limited power input. The realization of high-speed measurements shows new possibilities for analysis of heterogeneous phase systems and of fast reactions or processes.

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Section: Resultsmentioning

confidence: 99%

Highly Sensitive Raman Spectroscopy with Low Laser Power for Fast In-Line Reaction and Multiphase Flow Monitoring

et al. 2016

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Vaporization thermodynamics of normal alkyl benzoates

Notfullin

Bolmatenkov

Yagofarov

et al. 2022

J Therm Anal Calorim

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High-pressure behavior of a linear chain alkane, tricosane

Basu

Murphy

Mookherjee

et al. 2020

Journal of Applied Physics

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Exploring the behavior of hydrocarbon under pressure is important for understanding its role in planetary sciences and also for exploring novel organic chemistry. In this study, we explored the high-pressure behavior of a linear-chain hydrocarbon, tricosane (C23H48), using Raman spectroscopy. We compressed tricosane up to 23 GPa and did not find any evidence for pressure-induced amorphization within the conditions explored in this study. Upon compression, we observe new modes in the low energy region 100–300 cm−1. In order to understand the appearance of these new modes at high pressures, we used complementary ab initio calculations and explored the effect of chain configurations (linear and bent) on the predicted Raman spectra. We find that these new modes observed at higher pressures are better explained by bent configuration of tricosane chains. Thus, based on high-pressure Raman spectra, it is very likely that a linear chain of tricosane is bent under pressure, i.e., it undergoes a pressure-induced trans-gauche transformation. It is also likely that such bent regions (i.e., kinks) will act as sites along which large chain hydrocarbons could dissociate into smaller chain lengths at extreme conditions relevant to the interiors of Jovian planets.

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Unbranched n-Alkanes

Cited by 3 publications

References 97 publications

Highly Sensitive Raman Spectroscopy with Low Laser Power for Fast In-Line Reaction and Multiphase Flow Monitoring

Highly Sensitive Raman Spectroscopy with Low Laser Power for Fast In-Line Reaction and Multiphase Flow Monitoring

Vaporization thermodynamics of normal alkyl benzoates

High-pressure behavior of a linear chain alkane, tricosane

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