Unusual properties of water at hydrophilic/hydrophobic interfaces

The behaviour of water at mosaic hydrophilic/hydrophobic surfaces of different silicas and in biosystems (biomacromolecules, yeast cells, wheat seeds, bone and muscular tissues) was studied in different dispersion media over wide temperature range using 1H NMR spectroscopy with layer-by-layer freezi...

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Bibliographic Details
Published in:	Advances in colloid and interface science Vol. 118; no. 1; pp. 125 - 172
Main Authors:	Gun'ko, V.M., Turov, V.V., Bogatyrev, V.M., Zarko, V.I., Leboda, R., Goncharuk, E.V., Novza, A.A., Turov, A.V., Chuiko, A.A.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 30-12-2005 Elsevier
Subjects:	1H NMR Adsorption Bone tissue Chemistry Chemistry, Physical - methods Collagen Colloidal state and disperse state Dried muscular tissue Exact sciences and technology FTIR Fumed silica General and physical chemistry HSA Hydrophobic and Hydrophilic Interactions Interfacial water Interfacial water relaxation Layer-by-layer freezing-out of water Models, Chemical Modified silica Mosaic hydrophilic/hydrophobic interfaces Pore size distribution Porous materials Silica gel Silicon Dioxide - chemistry Silochrome Structural characteristics Surface physical chemistry Surface Properties Temperature TSDC Water - chemistry Wheat seeds Yeast cells Silochrome Dried muscular tissue Bone tissue Fumed silica Yeast cells Mosaic hydrophilic/hydrophobic interfaces 1H NMR Interfacial water relaxation Interfacial water Structural characteristics Modified silica Adsorption Pore size distribution Collagen FTIR HSA Layer-by-layer freezing-out of water TSDC Silica gel Wheat seeds Water NMR spectrometry Hydrophobicity Silica Relaxation Tissue Pore size Biological macromolecule Infrared spectrometry Distribution Bone Interface
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Summary:	The behaviour of water at mosaic hydrophilic/hydrophobic surfaces of different silicas and in biosystems (biomacromolecules, yeast cells, wheat seeds, bone and muscular tissues) was studied in different dispersion media over wide temperature range using 1H NMR spectroscopy with layer-by-layer freezing-out of bulk water (close to 273 K) and interfacial water (180 < T < 273 K), thermally stimulated depolarization current (TSDC) (90 < T < 270 K), infrared (IR) spectroscopy, and quantum chemical methods. Bulk water and water bound to hydrophilic/hydrophobic interfaces can be assigned to different structural types. There are (i) weakly associated interfacial water ( 1H NMR chemical shift δ H = 1.1–1.7 ppm) that can be assigned to high-density water (HDW) with collapsed structure (CS), representing individual molecules in hydrophobic pockets, small clusters and interstitial water with strongly distorted hydrogen bonds or without them, and (ii) strongly associated interfacial water ( δ H = 4–5 ppm) with larger clusters, nano- and microdomains, and continuous interfacial layer with both HDW and low-density water (LDW). The molecular mobility of weakly associated bound water is higher (because hydrogen bonds are distorted and weakened and their number is smaller than that for strongly associated water) than that of strongly associated bound water (with strong hydrogen bonds but nevertheless weaker than that in ice Ih) that results in the difference in the temperature dependences of the 1H NMR spectra at T < 273 K. These different waters are also appear in changes in the IR and TSDC spectra.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0001-8686 1873-3727
DOI:	10.1016/j.cis.2005.07.003