PMID- 21481573
OWN - NLM
STAT- PubMed-not-MEDLINE
DCOM- 20120112
LR  - 20110613
IS  - 1527-3326 (Electronic)
IS  - 0926-2040 (Linking)
VI  - 39
IP  - 3-4
DP  - 2011 May-Jun
TI  - Microheterogeneity in phenyl group modified inorganic/organic hybrid gels after 
      aerosol drying or slow solvent evaporation.
PG  - 142-50
LID - 10.1016/j.ssnmr.2011.03.005 [doi]
AB  - Sol-gel systems were prepared by co-hydrolysis and co-condensation of 
      tetraethoxysilane (TEOS) and phenyltriethoxysilane (PhTES). The sols were 
      transferred into silica gels by Evaporation Induced Self-Assembly (EISA) or 
      Aerosol Assisted Self-Assembly (AASA) using a laboratory spray-dryer. The 
      structural properties such as porosity and homogeneity/microheterogeneity of 
      these different systems are compared by N(2) sorption measurements, thermal 
      analysis (TG, DTG and DTA), (29)Si MAS NMR and (29)Si(1)H CP MAS NMR. The cross 
      polarization of the AASA gels can be described with the conventional I-S dynamics 
      of a homogeneous proton spin bath. The EISA gels are heterogeneous, and the 
      I-I(*)-S model, or a bimodal I-S model, was employed for the simulation of CP 
      dynamics. Microheterogeneities are observed by (1)H-(29)Si cross polarization on 
      an EISA sample, whereas rapid drying (AASA) transfers the corresponding sol into 
      homogeneous xerogels. The EISA gels are microporous after calcination at 923 K, 
      and the AASA gels are dense.
CI  - Copyright (c) 2011 Elsevier Inc. All rights reserved.
FAU - Ulke, Simone
AU  - Ulke S
AD  - Institute of Physical Chemistry, University of Munster, Corrensstrasse 28/30, 
      48149 Munster, Germany. us@uni-muenster.de
FAU - Koller, Hubert
AU  - Koller H
LA  - eng
PT  - Journal Article
DEP - 20110329
PL  - Netherlands
TA  - Solid State Nucl Magn Reson
JT  - Solid state nuclear magnetic resonance
JID - 9306181
EDAT- 2011/04/13 06:00
MHDA- 2011/04/13 06:01
CRDT- 2011/04/13 06:00
PHST- 2011/01/27 00:00 [received]
PHST- 2011/03/18 00:00 [revised]
PHST- 2011/03/21 00:00 [accepted]
PHST- 2011/04/13 06:00 [entrez]
PHST- 2011/04/13 06:00 [pubmed]
PHST- 2011/04/13 06:01 [medline]
AID - S0926-2040(11)00010-5 [pii]
AID - 10.1016/j.ssnmr.2011.03.005 [doi]
PST - ppublish
SO  - Solid State Nucl Magn Reson. 2011 May-Jun;39(3-4):142-50. doi: 
      10.1016/j.ssnmr.2011.03.005. Epub 2011 Mar 29.