Continuous surface functionalization of flame-made TiO2 nanoparticles
Hydrophilic TiO(2) particles made in a flame aerosol reactor were converted in situ to hydrophobic ones by silylation of their surface hydroxyl groups. So the freshly formed titania aerosol was mixed with a fine spray of octyltriethoxysilane (OTES) in water/ethanol solution and functionalized continuously at high temperature. The extent of functionalization and structure of that surface layer were assessed by thermogravimetric analysis (TGA) coupled to mass spectroscopy (MS), differential scanning calorimetry (DSC), Fourier transform infrared (FTIR), and Raman spectroscopy. Product particles were characterized also by transmission electron microscopy (TEM), X-ray diffraction, and nitrogen adsorption. The influence of titania specific surface area (SSA) and OTES solution concentration on the functional group surface density was investigated. The titanium dioxide surface was covered with functional groups (up to 2.9 wt %) that were thermally stable up to 300 degrees C in air at an average density of 2 OTES/nm(2). Such surface-functionalized particle suspensions in 2-ethylhexanoic acid and xylene were stable over several weeks. In contrast, as-prepared hydrophilic TiO(2) precipitated within days in these solvents.
| Medienart: |
E-Artikel |
|---|
| Erscheinungsjahr: |
2010 |
|---|---|
| Erschienen: |
2010 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:26 |
|---|---|
| Enthalten in: |
Langmuir : the ACS journal of surfaces and colloids - 26(2010), 8 vom: 20. Apr., Seite 5815-22 |
| Sprache: |
Englisch |
|---|
| Beteiligte Personen: |
Teleki, Alexandra [VerfasserIn] |
|---|
| Links: |
|---|
| Themen: |
|---|
| Anmerkungen: |
Date Completed 01.07.2010 Date Revised 13.04.2010 published: Print Citation Status PubMed-not-MEDLINE |
|---|
| doi: |
10.1021/la9037149 |
|---|
| funding: |
|
|---|---|
| Förderinstitution / Projekttitel: |
|
| PPN (Katalog-ID): |
NLM195440021 |
|---|
| LEADER | 01000naa a22002652 4500 | ||
|---|---|---|---|
| 001 | NLM195440021 | ||
| 003 | DE-627 | ||
| 005 | 20231223202753.0 | ||
| 007 | cr uuu---uuuuu | ||
| 008 | 231223s2010 xx |||||o 00| ||eng c | ||
| 024 | 7 | |a 10.1021/la9037149 |2 doi | |
| 028 | 5 | 2 | |a pubmed24n0652.xml |
| 035 | |a (DE-627)NLM195440021 | ||
| 035 | |a (NLM)20192157 | ||
| 040 | |a DE-627 |b ger |c DE-627 |e rakwb | ||
| 041 | |a eng | ||
| 100 | 1 | |a Teleki, Alexandra |e verfasserin |4 aut | |
| 245 | 1 | 0 | |a Continuous surface functionalization of flame-made TiO2 nanoparticles |
| 264 | 1 | |c 2010 | |
| 336 | |a Text |b txt |2 rdacontent | ||
| 337 | |a ƒaComputermedien |b c |2 rdamedia | ||
| 338 | |a ƒa Online-Ressource |b cr |2 rdacarrier | ||
| 500 | |a Date Completed 01.07.2010 | ||
| 500 | |a Date Revised 13.04.2010 | ||
| 500 | |a published: Print | ||
| 500 | |a Citation Status PubMed-not-MEDLINE | ||
| 520 | |a Hydrophilic TiO(2) particles made in a flame aerosol reactor were converted in situ to hydrophobic ones by silylation of their surface hydroxyl groups. So the freshly formed titania aerosol was mixed with a fine spray of octyltriethoxysilane (OTES) in water/ethanol solution and functionalized continuously at high temperature. The extent of functionalization and structure of that surface layer were assessed by thermogravimetric analysis (TGA) coupled to mass spectroscopy (MS), differential scanning calorimetry (DSC), Fourier transform infrared (FTIR), and Raman spectroscopy. Product particles were characterized also by transmission electron microscopy (TEM), X-ray diffraction, and nitrogen adsorption. The influence of titania specific surface area (SSA) and OTES solution concentration on the functional group surface density was investigated. The titanium dioxide surface was covered with functional groups (up to 2.9 wt %) that were thermally stable up to 300 degrees C in air at an average density of 2 OTES/nm(2). Such surface-functionalized particle suspensions in 2-ethylhexanoic acid and xylene were stable over several weeks. In contrast, as-prepared hydrophilic TiO(2) precipitated within days in these solvents | ||
| 650 | 4 | |a Journal Article | |
| 700 | 1 | |a Bjelobrk, Nada |e verfasserin |4 aut | |
| 700 | 1 | |a Pratsinis, Sotiris E |e verfasserin |4 aut | |
| 773 | 0 | 8 | |i Enthalten in |t Langmuir : the ACS journal of surfaces and colloids |d 1999 |g 26(2010), 8 vom: 20. Apr., Seite 5815-22 |w (DE-627)NLM098181009 |x 1520-5827 |7 nnns |
| 773 | 1 | 8 | |g volume:26 |g year:2010 |g number:8 |g day:20 |g month:04 |g pages:5815-22 |
| 856 | 4 | 0 | |u http://dx.doi.org/10.1021/la9037149 |3 Volltext |
| 912 | |a GBV_USEFLAG_A | ||
| 912 | |a GBV_NLM | ||
| 951 | |a AR | ||
| 952 | |d 26 |j 2010 |e 8 |b 20 |c 04 |h 5815-22 | ||