Fig. 2From: The effect of freezing speed and hydrogel concentration on the microstructure and compressive performance of bamboo-based cellulose aerogelPhotography and SEM images of the aerogels by initial freezing at −196 °C (a–c), −80 °C (d–f) and −20 °C (g–i). Arrows show the streaks due to ice crystalsBack to article page