Optical measurement of the pH value of intransparent samples under high pressure

Nagel, Manuela; Wierschem, Andreas; Rauh, Cornelia; Delgado, Antonio

doi:10.1080/08957959.2015.1027202

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…To determine the melting point, we decreased the pressure in steps of 10 MPa and kept the level for 10 min after each pressure reduction. For further details on the high‐pressure setup, we refer to the studies by Ferstl et al () and by Nagel et al ().…”

Section: Methodsmentioning

confidence: 99%

Growth Rate of Pressure‐Induced Triolein Crystals

Roßbach

Bahr

Gäbel

et al. 2018

J Americ Oil Chem Soc

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In pressure-induced crystal growth of triolein from melt at pressures up to 300 MPa and at temperatures between 283.16 and 293.16 K, we can distinguish three different crystal morphologies. Raman spectroscopy indicates that they are related to different polymorphic structures. Switching from the most stable to a less-stable structure implies a jump in the growth rate to a maximum value. As pressure increases, the growth rate decreases indicating that the growth is transport limited. Measurements at different temperatures show that the growth rate is mainly governed by pressure. In a certain parameter range, we observe crossnucleation to crystals with a higher growth rate. These crystals have a Raman fingerprint not yet described in the literature.

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Section: Methodsmentioning

confidence: 99%

Growth Rate of Pressure‐Induced Triolein Crystals

Roßbach

Bahr

Gäbel

et al. 2018

J Americ Oil Chem Soc

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“…The compression ramps with this device had a steepness of 100 MPa min −1 . The device is identical to that used by Roßbach et al (2019) and Nagel et al (2015), to which we refer for further details.…”

Section: Methodsmentioning

confidence: 99%

Melting Curves of Triolein Polymorphs

Porde

Roßbach

Ferstl³

et al. 2020

J Americ Oil Chem Soc

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High-pressure treatment is a promising option for improving mechanical properties and processing parameters of fat-containing products. To identify optimum processing windows, melting curves, crystallization kinetics, and pathways for transferring the optimized structures to atmospheric pressure need to be known. Here, we provide melting curves of different polymorphic forms of triolein in the industrially relevant pressure range. The melting points of different polymorphic forms are detected optically in thin samples during stepwise changes of pressure or temperature. For cross-nucleated spherulites, this method allows determining the respective melting points of nuclei and overgrown structures. Tracing the melting curves to atmospheric pressure confirms previous identification of the polymorphic forms at high pressure and enables identifying a previously reported but undefined structure as the β 2-form. Employing Raman spectroscopy, it is confirmed that the polymorph remained unaltered during the pressure release. With increasing pressure, the melting curves of the different polymorphic forms approach each other until they successively merge at the highest pressure levels studied.

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Nukleation und Wachstum von druckinduzierten polymorphen Molekülkristallen

Yakam

Wierschem

2015

Chemie Ingenieur Technik

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Optical measurement of the pH value of intransparent samples under high pressure

Cited by 3 publications

References 25 publications

Growth Rate of Pressure‐Induced Triolein Crystals

Growth Rate of Pressure‐Induced Triolein Crystals

Melting Curves of Triolein Polymorphs

Nukleation und Wachstum von druckinduzierten polymorphen Molekülkristallen

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