Aerogel granule sizes

Failed specimen analysis was carried out to purge out the redundant data, which is defined as a specimen already failing at first level but having duphcate data at higher levels. The Failed Specimen Analysis is shown in Appendix 5A. In addition, 55 FD specimens were tested for strain recovery, strength and modulus at 45 % compressive strain as part of the validation data. The data include 40 specimens that were studied for the influence of the silica aerogel granule size on the mechanical properties. 

Table 5.3 Summary of density, strain recovery, compressive strength, and modulus of GSA-SDS composites in terms of aerogel granule sizes under optimal conditions...

Fig. 5.17 Influence of silica aerogel granule size on a strain recovery b compressive strength and c compressive modulus...

However, it is observed that the smaller the granule size the higher the strength and modulus. Interestingly, the maximum strain recovery recorded for 2.18 mm silica aerogel granule size also showed the minimum strength and modulus. 

Table 6.2 A and B constants and values of respective aerogel granule size thermal conductivity...

In the previous chapter, the optimized mechanical properties are achieved when 0.56 %wt. SDS was added to the GSA composites. The GSA-SDS composites of various aerogel granule sizes are fabricated with 0.56 %wt. SDS for gelatin to silica aerogel granules mass fraction ratios of 0.2 0.8 and 0.4 0.6 respectively. The effects of the granule size on the thermal conductivity are investigated for the temperature profile described in Sect. 6.1 is shown in Fig. 6.9. 

Fig. 6.17 Variations in contact angle of GSA-SDS due to various silica aerogel granule sizes and FMWNT...

Table 7.1 Classification and physical propeities of silica aerogel granules sizes...

GSA-SDS and GSA-SDS/FMWNT specimens of 100 and 29 mm diameter in varying thicknesses are fabricated via FD method described in the same manner as previously reported (Mahesh and Joshi 2015) comprising of 1.2 and 1.7 mm silica aerogel granule sizes (GSA-AG2 and GSA-AG3) as shown in Table 7.3. 

Figure 45.9 Total transmittance spectra of translucent aerogel windows with large aerogel granule sizes (WIN-AB, about 3-5 mm) and small aerogel granule sizes (WIN-AS, <0.5 mm) with different thicknesses of the aerogel granule window layer (17).

With a focus on fine particle technology, Cabot is able to control optical properties, granule size, distribution, and porosity during the manufacturing of aerogel - the end result is a highly adaptive material (Table 38.1). 

F. 6.6 Weighted two-term Gaussian fitted function to represent the distribution of silica aerogel granules in terms of size d (cm)... 

Fig. 6.7 a Thermal conductivity of silica aerogel granules of various sizes as a function of b experimental versus predicted formulation (Eq. 6.12)... 

Table 7.1 shows the classification, sample distribution, and their physical properties for each granule size. Figure 7.4 shows how the silica aerogel granules are prepared for the experiment. First, the acoustics absorption of an appropriate thin porous ply is evaluated. Then, silica aerogel granules of various sizes are filled in the impedance mbe to the depths of 10 and 15 mm covered with a layer of porous ply held... 

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