Infuence of Isomeric Composition and Sample Handling on the Liquid Density of Hydrofuorethers Measured by Vibrating Tube Densimeter at 0.1 MPa

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388998%3A_____%2F23%3A00574344" target="_blank" >RIV/61388998:_____/23:00574344 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/article/10.1007/s10765-023-03247-6#Fun" target="_blank" >https://link.springer.com/article/10.1007/s10765-023-03247-6#Fun</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10765-023-03247-6" target="_blank" >10.1007/s10765-023-03247-6</a>

Result language

angličtina

Original language name

Infuence of Isomeric Composition and Sample Handling on the Liquid Density of Hydrofuorethers Measured by Vibrating Tube Densimeter at 0.1 MPa

Original language description

Hydrofluoroethers (HFEs) represent a new family of promising engineering fluids suitable for technical cleaning and cooling of electronic and magnetic devices or as admixtures in refrigerant blends. Here, we report accurate data for the liquid density at 0.1 MPa and temperatures from 273.15K to 343.15K for a series of five HFEs, namely, HFE-7000, HFE-7100, HFE-7200, HFE-7300, and HFE-7500. A highly sensitive vibrating tube densimeter with a borosilicate glass U-tube calibrated according to the procedure by Prokopova et al. (J Chem Thermodyn 173:106855, 2022) provided density data with an expanded uncertainty ( k = 2) of 0.13 kg center dot m(-3). Influences such as sample degassing, water content, or sample temperature before its dosing into the densimeter are discussed. Thanks to the high sensitivity of the used densimeter, an unexpected shift in the density of different HFE-7100 and HFE-7200 liquid samples was detected. Unlike other HFEs, HFE-7100 and HFE-7200 are mixtures of two hardly separable isomers, which were so far considered having identical thermophysical properties. Utilizing nuclear magnetic resonance spectroscopy, the ratio of n-isomer and iso-isomer was inspected for various liquid samples. In the range of iso-isomer mole fraction from 0.61 to 0.77, the new measurements revealed density differences of more than 5 kg center dot m(-3) in case of HFE-7100 and of about 3 kg center dot m(-3) in case of HFE-7200. Consequently, for some applications, the properties of different HFE isomers cannot be considered identical. The Rackett-type correlation for the saturated liquid density was fitted using the new and the literature data.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20303 - Thermodynamics

Project

<a href="/en/project/GA22-03380S" target="_blank" >GA22-03380S: Aqueous mixtures with salts under extreme conditions – accurate experiments, molecular simulations and modeling</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2023

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

International Journal of Thermophysics

ISSN

0195-928X

e-ISSN

1572-9567

Volume of the periodical

44

Issue of the periodical within the volume

9

Country of publishing house

US - UNITED STATES

Number of pages

21

Pages from-to

139

UT code for WoS article

001049276900002

EID of the result in the Scopus database

2-s2.0-85168415137