Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 854-859 |
| Seitenumfang | 6 |
| Fachzeitschrift | SMALL |
| Jahrgang | 5 |
| Ausgabenummer | 7 |
| Frühes Online-Datum | 1 Apr. 2009 |
| Publikationsstatus | Veröffentlicht - 6 Apr. 2009 |
Abstract
Nanometer-sized mesoporous silica particles of around 100-nm diameter functionalized with a large amount of sulfonic acid groups are prepared using a simple and fast in situ co-condensation procedure. A highly ordered hexagonal pore structure is established by applying a pre-hydrolysis step in a high-dilution synthesis approach, followed by adding the functionalization agent to the reaction mixture. The high-dilution approach is advantageous for the in situ functionalization since no secondary reagents for an effective particle and framework formation are needed. Structural data are determined via electron microscopy, nitrogen adsorption, and X-ray diffraction, proton conductivity values of the functionalized samples are measured via impedance spectroscopy. The obtained mesoporous SO3H-MCM-41 nanoparticles demonstrate superior proton conductivity than their equally loaded micrometer-sized counterparts, up to 5×102 S cm-1. The mesoporosity of the particles turns out to be very important for effective proton transport since non-porous silica nanoparticles exhibit worse efficient proton transport, and the obtained particle size dependence might open up a new route in rational design of highly proton conductive materials.
ASJC Scopus Sachgebiete
- Biochemie, Genetik und Molekularbiologie (insg.)
- Biotechnologie
- Werkstoffwissenschaften (insg.)
- Biomaterialien
- Chemie (insg.)
- Werkstoffwissenschaften (insg.)
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in: SMALL, Jahrgang 5, Nr. 7, 06.04.2009, S. 854-859.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Nanoparticles of Mesoporous SO3H-Functionalized Si-MCM-41 with Superior Proton Conductivity
AU - Marschall, Roland
AU - Bannat, Inga
AU - Feldhoff, Armin
AU - Wang, Lianzhou
AU - Lu, Gao Qing
AU - Wark, Michael
PY - 2009/4/6
Y1 - 2009/4/6
N2 - Nanometer-sized mesoporous silica particles of around 100-nm diameter functionalized with a large amount of sulfonic acid groups are prepared using a simple and fast in situ co-condensation procedure. A highly ordered hexagonal pore structure is established by applying a pre-hydrolysis step in a high-dilution synthesis approach, followed by adding the functionalization agent to the reaction mixture. The high-dilution approach is advantageous for the in situ functionalization since no secondary reagents for an effective particle and framework formation are needed. Structural data are determined via electron microscopy, nitrogen adsorption, and X-ray diffraction, proton conductivity values of the functionalized samples are measured via impedance spectroscopy. The obtained mesoporous SO3H-MCM-41 nanoparticles demonstrate superior proton conductivity than their equally loaded micrometer-sized counterparts, up to 5×102 S cm-1. The mesoporosity of the particles turns out to be very important for effective proton transport since non-porous silica nanoparticles exhibit worse efficient proton transport, and the obtained particle size dependence might open up a new route in rational design of highly proton conductive materials.
AB - Nanometer-sized mesoporous silica particles of around 100-nm diameter functionalized with a large amount of sulfonic acid groups are prepared using a simple and fast in situ co-condensation procedure. A highly ordered hexagonal pore structure is established by applying a pre-hydrolysis step in a high-dilution synthesis approach, followed by adding the functionalization agent to the reaction mixture. The high-dilution approach is advantageous for the in situ functionalization since no secondary reagents for an effective particle and framework formation are needed. Structural data are determined via electron microscopy, nitrogen adsorption, and X-ray diffraction, proton conductivity values of the functionalized samples are measured via impedance spectroscopy. The obtained mesoporous SO3H-MCM-41 nanoparticles demonstrate superior proton conductivity than their equally loaded micrometer-sized counterparts, up to 5×102 S cm-1. The mesoporosity of the particles turns out to be very important for effective proton transport since non-porous silica nanoparticles exhibit worse efficient proton transport, and the obtained particle size dependence might open up a new route in rational design of highly proton conductive materials.
KW - Hybrid materials
KW - Mesoporous materials
KW - Nanoparticles
KW - Proton conductivity
KW - Silica
UR - http://www.scopus.com/inward/record.url?scp=65549127631&partnerID=8YFLogxK
U2 - 10.1002/smll.200801235
DO - 10.1002/smll.200801235
M3 - Article
C2 - 19226596
AN - SCOPUS:65549127631
VL - 5
SP - 854
EP - 859
JO - SMALL
JF - SMALL
SN - 1613-6810
IS - 7
ER -