Cellulose–silica composite aerogels from “one-pot” synthesis

Chapter 14. Cellulose and Protein Aerogels for Oil Spill Cleaning, Life Science and Food Engineering Applications

“…The mesostructure of the silica particles was similar to the findings of other groups that developed silica-cellulose aerogels. 73,74 The BET surface areas of the silica-cellulose composite aerogels in Table 14.6 were between approximately 198 and 296 m 2 g À1 , comparable to the surface areas found in similar studies conducted by Demilecamps et al (90-170 m 2 g À1 ) 75 and Litschauer et al (220-290 m 2 g À1 ). 76 As can be observed in Figure 14.9, the X-ray diffraction patterns of the silica-cellulose composite aerogels seem to be the superposition of those of the pure cellulose aerogels and the pure silica aerogels, which is similar to the findings of Cai et al 77 This XRD finding implies that the extent of the chemical reaction between the cellulose fibres and the silica components was quite limited, as no new compound was detected.…”

Biopolymer‐Aerogele und ‐Schäume: Chemie, Eigenschaften und Anwendungen

“…Die mechanischen Eigenschaften von Biopolymer‐Aerogelen werden hauptsächlich anhand von Kompressionsprüfung beurteilt,,–,,,,,,– mit nur wenigen verfügbaren Messungen der Schallgeschwindigkeit und Zug‐ und Drei‐Punkt‐Biegefestigkeit . Wir besprechen zunächst die mechanischen Eigenschaften typischer Biopolymer‐Aerogele, bevor wir die verstärkende Wirkung von Biopolymeren in Aerogel‐Verbundmaterialien betrachten.…”

“…Diese Strategie wurde für rein organische und für organisch‐anorganische,, Hybridaerogele eingesetzt. Nanocellulose wurde zum Verstärken von Sojaprotein‐, Molkeprotein‐ und Organosilan(PMSQ)‐Aerogelen verwendet. CNF wurde auch in Kombination mit Xyloglucan zum Herstellen festerer und steiferer Cellulose‐Aerogele über verbesserte physikalische Vernetzung verwendet .…”

Mechanical and thermal properties of nanofibrillated cellulose reinforced silica aerogel composites

“…In most of these cases, prepared cellulose gels are modified in silica sol solutions to create interpenetrating networks of silica and cellulose [25e29,31]. Homogenous distributions of cellulose is better achieved using "one pot" synthesis concepts, however issues with solubility, dispersibility, and chemical surface reactions may lead to undesired microstructures and properties [30]. While, these studies have composite materials that are relatively mechanically robust compared to neat silica aerogel materials, the thermal conductivity values reported for the composite materials of 26e45 mW/m K are substantially higher than those of neat silica aerogel systems [31].…”