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Structural studies of water in hydrophilic and hydrophobic mesoporous silicas: An x-ray and neutron diffraction study at 297 K
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10.1063/1.3530584
/content/aip/journal/jcp/134/6/10.1063/1.3530584
http://aip.metastore.ingenta.com/content/aip/journal/jcp/134/6/10.1063/1.3530584

Figures

Image of FIG. 1.
FIG. 1.

The measured intensity profiles for x-ray scattering from “dry” (dotted line) and “wet” (dashed line) samples: (a) nonmodified silica and (b) modified silica, at 297 K; the continuous line shows the diffraction pattern for the confined water. Part (c) shows a comparison for the two dry silica nonmodified sample (dashed line) and modified sample (dotted line).

Image of FIG. 2.
FIG. 2.

The structure factor of water confined in (a) nonmodified and (b) modified samples compared with those of bulk water (dotted line) (Ref. 35) at room temperature.

Image of FIG. 3.
FIG. 3.

(a) Total x-ray radial distribution function, d L (r), of water confined in the nonmodified sample (continuous line) compared with that of bulk water (Ref. 35) (dotted line) at 297 K. (b) Total x-ray radial distribution function, d L (r), of water confined in the modified sample (continuous line) compared with that of the bulk water (Ref. 35) (dotted line) at 297 K.

Image of FIG. 4.
FIG. 4.

Total neutron radial distribution function, d L (r), of water confined in nonmodified sample compared with silica gel hydrated at 50% (dotted line) (Ref. 3), determined at 297 K.

Image of FIG. 5.
FIG. 5.

Total x-ray radial distribution functions, d L (r), of water confined in the modified sample (continuous line); in myoglobin, hydrated at 39% (Ref. 45) (dotted line); and in activated carbon, hydrated at 42% (Ref. 10) (x symbols).

Image of FIG. 6.
FIG. 6.

The qD M (q) function for liquid water confined in nonmodified (continuous line A) and modified sample hydrated at 45% (continuous line B) compared with those of bulk water (Ref. 32) (dotted line) obtained by neutron diffraction.

Image of FIG. 7.
FIG. 7.

The neutron pair correlation functions, d L (r), of water confined in nonmodified silica gel (hydrated at 45%) compared with that of bulk water (Ref. 32) (dotted line) at room temperature.

Image of FIG. 8.
FIG. 8.

The neutron pair correlation functions, d L (r), of water contained in the modified sample compared with that of bulk water (Ref. 32) (dotted line) at room temperature.

Tables

Generic image for table
Table I.

Pore characterization by gas adsorption. (Analytical data realized surface density with respect to A(), pore volume at p/p0 = 0.95, mean mesopore diameters (Barrett-Joyner-Halenda (BJH) method), surface area, and C-value of the Brunauer-Emmett-Teller (BET)-3 fit.)

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/content/aip/journal/jcp/134/6/10.1063/1.3530584
2011-02-09
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Structural studies of water in hydrophilic and hydrophobic mesoporous silicas: An x-ray and neutron diffraction study at 297 K
http://aip.metastore.ingenta.com/content/aip/journal/jcp/134/6/10.1063/1.3530584
10.1063/1.3530584
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