Interfacial Behavior of Low- and High-Molecular Weight Compounds vs. Temperature and Confinement Effects
The interfacial and temperature behavior of water, n-decane, decanol, poly(dimethylsiloxane) (PDMS) bound to nanooxides initial or after high-pressure cryogelation and silica gels was analyzed using low-temperature 1H NMR spectroscopy (applied to static samples to observe only mobile adsorbates), d...
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Chuiko Institute of Surface Chemistry of NAS of Ukraine
2014-11-01
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| Series: | Хімія, фізика та технологія поверхні |
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| Online Access: | https://cpts.com.ua/index.php/cpts/article/view/298 |
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| author | V. M. Gun'ko V. V. Turov V. I. Zarko O. V. Goncharuk O. S. Remez R. Leboda J. Skubiszewska-Zięba |
| author_facet | V. M. Gun'ko V. V. Turov V. I. Zarko O. V. Goncharuk O. S. Remez R. Leboda J. Skubiszewska-Zięba |
| author_sort | V. M. Gun'ko |
| collection | DOAJ |
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The interfacial and temperature behavior of water, n-decane, decanol, poly(dimethylsiloxane) (PDMS) bound to nanooxides initial or after high-pressure cryogelation and silica gels was analyzed using low-temperature 1H NMR spectroscopy (applied to static samples to observe only mobile adsorbates), differential scanning calorimetry (DSC), thermoporometry and quantum chemical methods. Both NMR and DSC results demonstrated that during heating of frozen samples a fraction of organics or PDMS remained frozen at temperature higher than the melting point of bulk liquid and a fraction of any adsorbate remained unfrozen upon cooling at temperature lower than the freezing point. These effects depend on the type of an adsorbate and the pore sizes of an adsorbent. Broadening of freezing/melting temperature range is observed for PDMS or decane confined in pores of silica gel or voids between nanoparticles in fumed nanooxides. This effect is minimal for silica gel Si-100 with broad mesopores.
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| format | Article |
| id | doaj-art-06a5bd6644d44562a0e8bf191c1ce636 |
| institution | Kabale University |
| issn | 2079-1704 2518-1238 |
| language | English |
| publishDate | 2014-11-01 |
| publisher | Chuiko Institute of Surface Chemistry of NAS of Ukraine |
| record_format | Article |
| series | Хімія, фізика та технологія поверхні |
| spelling | doaj-art-06a5bd6644d44562a0e8bf191c1ce6362025-08-20T03:31:14ZengChuiko Institute of Surface Chemistry of NAS of UkraineХімія, фізика та технологія поверхні2079-17042518-12382014-11-015410.15407/hftp05.04.361Interfacial Behavior of Low- and High-Molecular Weight Compounds vs. Temperature and Confinement EffectsV. M. Gun'ko0V. V. Turov1V. I. Zarko2O. V. Goncharuk3O. S. Remez4R. Leboda5J. Skubiszewska-Zięba6Chuiko Institute of Surface Chemistry of National Academy of Sciences of UkraineChuiko Institute of Surface Chemistry of National Academy of Sciences of UkraineChuiko Institute of Surface Chemistry of National Academy of Sciences of UkraineChuiko Institute of Surface Chemistry of National Academy of Sciences of UkraineChuiko Institute of Surface Chemistry of National Academy of Sciences of UkraineMaria Curie-Skłodowska UniversityMaria Curie-Skłodowska University The interfacial and temperature behavior of water, n-decane, decanol, poly(dimethylsiloxane) (PDMS) bound to nanooxides initial or after high-pressure cryogelation and silica gels was analyzed using low-temperature 1H NMR spectroscopy (applied to static samples to observe only mobile adsorbates), differential scanning calorimetry (DSC), thermoporometry and quantum chemical methods. Both NMR and DSC results demonstrated that during heating of frozen samples a fraction of organics or PDMS remained frozen at temperature higher than the melting point of bulk liquid and a fraction of any adsorbate remained unfrozen upon cooling at temperature lower than the freezing point. These effects depend on the type of an adsorbate and the pore sizes of an adsorbent. Broadening of freezing/melting temperature range is observed for PDMS or decane confined in pores of silica gel or voids between nanoparticles in fumed nanooxides. This effect is minimal for silica gel Si-100 with broad mesopores. https://cpts.com.ua/index.php/cpts/article/view/298nanooxidessilica gelscryonanooxidesinterfacial phenomenaconfined space effectsfreezing point depression |
| spellingShingle | V. M. Gun'ko V. V. Turov V. I. Zarko O. V. Goncharuk O. S. Remez R. Leboda J. Skubiszewska-Zięba Interfacial Behavior of Low- and High-Molecular Weight Compounds vs. Temperature and Confinement Effects Хімія, фізика та технологія поверхні nanooxides silica gels cryonanooxides interfacial phenomena confined space effects freezing point depression |
| title | Interfacial Behavior of Low- and High-Molecular Weight Compounds vs. Temperature and Confinement Effects |
| title_full | Interfacial Behavior of Low- and High-Molecular Weight Compounds vs. Temperature and Confinement Effects |
| title_fullStr | Interfacial Behavior of Low- and High-Molecular Weight Compounds vs. Temperature and Confinement Effects |
| title_full_unstemmed | Interfacial Behavior of Low- and High-Molecular Weight Compounds vs. Temperature and Confinement Effects |
| title_short | Interfacial Behavior of Low- and High-Molecular Weight Compounds vs. Temperature and Confinement Effects |
| title_sort | interfacial behavior of low and high molecular weight compounds vs temperature and confinement effects |
| topic | nanooxides silica gels cryonanooxides interfacial phenomena confined space effects freezing point depression |
| url | https://cpts.com.ua/index.php/cpts/article/view/298 |
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