NDLI: Long-term flexibility-based structural evolution and condensation in microporous organosilica membranes for gas separation

Content Provider	Royal Society of Chemistry (RSC)
Author	Kappert, Emiel J. Elshof, Johan E. ten Benes, Nieck E. Tempelman, Kristianne Winnubst, Louis Dral, A. Petra
Copyright Year	2017
Abstract	Hybrid organosilica molecular sieving membranes with ethylene bridges are generally consolidated at 250–300 °C for 2–3 hours, after which the material structure is assumed to be stabilized. This study shows that the consolidation process still continues at these temperatures after days to weeks. Ongoing condensation and structural evolution are studied in powders, films and gas permeation membranes derived from 1,2-bis(triethoxysilyl)ethane (BTESE) that are kept at temperatures up to 300 °C for days and analyzed with in situ Fourier-transform infrared spectroscopy, 29Si cross-polarized magic angle spinning nuclear magnetic resonance, in situ spectroscopic ellipsometry, in situ gas permeation and in situ X-ray reflectivity. A continuously ongoing decrease in both silanol concentration and film thickness is observed, accompanied by changes in density, thermal expansion and micropore structure. The changes in the micropore structure are found to depend on pore size and affect the gas permeation performance of membranes. An important factor in the structural evolution is the network flexibility. Materials containing no organic bridges, short flexible bridges or long rigid bridges (derived from tetraethoxysilane (TEOS), bis(triethoxysilyl)methane (BTESM) and 1,4-bis(triethoxysilyl)benzene (BTESB), respectively) also show ongoing condensation, but their shrinkage rate is smaller as compared to BTESE-derived networks. A BTESE-derived film kept at 236 °C for 12 days still shows no signs of approaching a structurally stabilized state.
Starting Page	1268
Ending Page	1281
Page Count	14
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	5
Issue Number	3
Journal	Journal of Materials Chemistry A
DOI	10.1039/c6ta09559c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	TEOS Ethylene Fourier-transform infrared spectroscopy Magic angle spinning Nuclear magnetic resonance Ellipsometry X-ray reflectivity Silanol Thermal expansion Tetraethyl orthosilicate Methane Benzene
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Long-term flexibility-based structural evolution and condensation in microporous organosilica membranes for gas separation

Highly selective CO₂ separation membranes through tunable poly(4-vinylphenolate)–CO₂ interactions

A novel approach to raspberry-like particles for superhydrophobic materials

A reusable Mn(ii)-dampy-MCM-41 system for single step amination of benzene to aniline using hydroxylamine

Sol-gel synthesis of sodium-modified AlPO₄–SiO₂ glasses and structural characterization by solid state NMR

Angle Spinning Nuclear Magnetic Resonance (MAS-NMR) and Fourier Transform Infrared

Accessibility and Location of Acid Sites in Zeolites as Probed by Fourier Transform Infrared Spectroscopy and Magic Angle Spinning Nuclear Magnetic Resonance

A solid state ²⁹Si and ¹³C NMR study on the synthesis of thin silicon–oxycarbide glass sheets by a sol–gel route

Tetraethyl Orthosilicate ( TEOS ) sebagai Sumber Silika

Long-term flexibility-based structural evolution and condensation in microporous organosilica membranes for gas separation

Similar Documents

Long-term flexibility-based structural evolution and condensation in microporous organosilica membranes for gas separation

Highly selective CO2 separation membranes through tunable poly(4-vinylphenolate)–CO2 interactions

A novel approach to raspberry-like particles for superhydrophobic materials

A reusable Mn(ii)-dampy-MCM-41 system for single step amination of benzene to aniline using hydroxylamine

Sol-gel synthesis of sodium-modified AlPO4–SiO2 glasses and structural characterization by solid state NMR

Angle Spinning Nuclear Magnetic Resonance (MAS-NMR) and Fourier Transform Infrared

Accessibility and Location of Acid Sites in Zeolites as Probed by Fourier Transform Infrared Spectroscopy and Magic Angle Spinning Nuclear Magnetic Resonance

A solid state 29Si and 13C NMR study on the synthesis of thin silicon–oxycarbide glass sheets by a sol–gel route

Tetraethyl Orthosilicate ( TEOS ) sebagai Sumber Silika

Long-term flexibility-based structural evolution and condensation in microporous organosilica membranes for gas separation

Highly selective CO₂ separation membranes through tunable poly(4-vinylphenolate)–CO₂ interactions

Sol-gel synthesis of sodium-modified AlPO₄–SiO₂ glasses and structural characterization by solid state NMR

A solid state ²⁹Si and ¹³C NMR study on the synthesis of thin silicon–oxycarbide glass sheets by a sol–gel route