کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9675232 | 1453614 | 2005 | 48 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Unusual properties of water at hydrophilic/hydrophobic interfaces
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کلمات کلیدی
HSATSDC1H NMR - 1H-NMRInterfacial water - آب درونیBone tissue - بافت استخوانیPore size distribution - توزیع اندازه پورتAdsorption - جذبWheat seeds - دانه گندمYeast cells - سلول های مخمریModified silica - سیلیس اصلاح شدهfumed silica - سیلیس فومSilica gel - سیلیکا ژلFTIR - طیف سنج مادون قرمزStructural characteristics - ویژگی های ساختاریCollagen - کلاژن
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
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 δH = 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 (δH = 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.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Advances in Colloid and Interface Science - Volume 118, Issues 1â3, 30 December 2005, Pages 125-172
Journal: Advances in Colloid and Interface Science - Volume 118, Issues 1â3, 30 December 2005, Pages 125-172
نویسندگان
V.M. Gun'ko, V.V. Turov, V.M. Bogatyrev, V.I. Zarko, R. Leboda, E.V. Goncharuk, A.A. Novza, A.V. Turov, A.A. Chuiko,