Book contents
- Frontmatter
- Dedicatioin
- Contents
- Preface
- 1 Introduction
- 2 Chemical Synthesis of Aerogels from Monomeric Precursors
- 3 Chemical Synthesis of Aerogels from Polymeric Precursors
- 4 Gelation
- 5 Drying of Wet Gels
- 6 Morphology of Aerogels
- 7 Density: Models and Measures
- 8 Specific Surface Area
- 9 Pores and Pore Sizes
- 10 Diffusion in Aerogels
- 11 Permeability for Gases
- 12 Thermal Properties
- 13 Mechanical Properties of Aerogels
- 14 How to Cook Aerogels: Recipes and Procedures
- Appendix A Thermodynamics and Phase Separation in Immiscibles
- Appendix B Flory–Huggins Theory of Polymer Solutions
- Appendix C A Brief Review on Scattering
- Appendix D Mathematics of Polycondensation
- Appendix E Time-Dependent Heat Transfer through an Isolated Tube
- References
- Index
12 - Thermal Properties
Published online by Cambridge University Press: 03 December 2021
- Frontmatter
- Dedicatioin
- Contents
- Preface
- 1 Introduction
- 2 Chemical Synthesis of Aerogels from Monomeric Precursors
- 3 Chemical Synthesis of Aerogels from Polymeric Precursors
- 4 Gelation
- 5 Drying of Wet Gels
- 6 Morphology of Aerogels
- 7 Density: Models and Measures
- 8 Specific Surface Area
- 9 Pores and Pore Sizes
- 10 Diffusion in Aerogels
- 11 Permeability for Gases
- 12 Thermal Properties
- 13 Mechanical Properties of Aerogels
- 14 How to Cook Aerogels: Recipes and Procedures
- Appendix A Thermodynamics and Phase Separation in Immiscibles
- Appendix B Flory–Huggins Theory of Polymer Solutions
- Appendix C A Brief Review on Scattering
- Appendix D Mathematics of Polycondensation
- Appendix E Time-Dependent Heat Transfer through an Isolated Tube
- References
- Index
Summary
Aerogels are famous for theirlow thermal conductivity making them the super-isolation materials of the future. The extreme small conductivity, which can be even close to the conductivity of vacuum isolation panels, poses, however, problems to many conventional measurement techniques, since even smallest heat leaks might give erroneous results by easily 20–30%. This chapter therefore is divided into several sections: first, general aspects of heat conduction are treated; and second, models are discussed explaining the thermal conductivity, specific heat and thermal diffusivity of porous materials, especially aerogels. The experimental techniques to measure thermal conductivity of isolating materials are discussed in detail and the theoretical background explained.
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- The Chemistry and Physics of AerogelsSynthesis, Processing, and Properties, pp. 315 - 355Publisher: Cambridge University PressPrint publication year: 2021
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