NDLI: Mechanical Properties of Gel-Derived Materials

Content Provider	Springer Nature Link
Author	Woignier, T. Despetis, F. Alaoui, A. Etienne, P. Phalippou, J.
Copyright Year	2000
Abstract	The mechanical behaviour of xerogels and aerogels is generally described in terms of brittle and elastic materials, like glasses or ceramics. The main difference compared to silica glass is the order of magnitude of the elastic and rupture moduli which are 10$^{4}$ times lower. However, if this analogy is pertinent when gels are under a tension stress (bending test) they exhibit a more complicated response when the structure is submitted to a compressive stress. The network is linearly elastic under small strains, then exhibits yield followed by densification and plastic hardening. As a consequence of the plastic shrinkage it is possible to densify and stiffen the gel at room temperature. These opposite behaviours (elastic and plastic) are surprisingly related to the same two kinds of gel features: the silanol content and the pore volume. Both elastic modulus and plastic shrinkage depend strongly on the volume fraction of pores and on the condensation reaction between silanols. On the mechanical point of view (rupture modulus and toughness), it is shown that pores and silanols play also an important role. Pores can be considered as flaws in the terms of fracture mechanics and the flaw size, calculated from rupture strength and toughness is related to the pore size distribution. Different kinds of gels structure (fractal or not fractal) have been synthesized by a control of the different steps of transformation such as sintering and plastic compaction. The relationships between structural and the elastic properties are discussed in terms of the percolation theory and fractal structure.
Starting Page	163
Ending Page	169
Page Count	7
File Format	PDF
ISSN	09280707
Journal	Journal of Sol-Gel Science and Technology
Volume Number	19
Issue Number	1-3
e-ISSN	15734846
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Inorganic Chemistry Optical and Electronic Materials Ceramics, Glass, Composites, Natural Methods
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Chemistry Materials Chemistry Biomaterials Condensed Matter Physics Electronic, Optical and Magnetic Materials

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

Sol–gel derived durable antireflective coating for solar glass

Highly transparent sol-gel derived ureasilicate monoliths exhibiting long-term optical stability

Nuclear Waste Storage in Gel-Derived Materials

Membrane Emulsification Using Sol-Gel Derived Macroporous Silica Glass

Mechanical properties of sol–gel coatings on polycarbonate: a review

Physical Properties of Sol-Gel Coatings

PZT Aerogels: Sol-Gel Derived Piezoelectric 3-3 Composites

Sol–gel-derived nanocomposite coatings filled with inorganic fullerene-like WS$_{2}$

Ultraviolet-Laser-Induced Crystallization of Sol-Gel Derived Inorganic Oxide Films

Mechanical Properties of Gel-Derived Materials

Similar Documents

Sol–gel derived durable antireflective coating for solar glass

Highly transparent sol-gel derived ureasilicate monoliths exhibiting long-term optical stability

Nuclear Waste Storage in Gel-Derived Materials

Membrane Emulsification Using Sol-Gel Derived Macroporous Silica Glass

Mechanical properties of sol–gel coatings on polycarbonate: a review

Physical Properties of Sol-Gel Coatings

PZT Aerogels: Sol-Gel Derived Piezoelectric 3-3 Composites

Sol–gel-derived nanocomposite coatings filled with inorganic fullerene-like WS$_{2}$

Ultraviolet-Laser-Induced Crystallization of Sol-Gel Derived Inorganic Oxide Films

Mechanical Properties of Gel-Derived Materials