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Carbon nanotube (CNT) aerogels with varying and controllable density were fabricated from low-cost raw materials via simple steps based on sol–gel technique. CNT raw powders were dispersed in water with sodium dodecyl benzene sulfonate as surfactant under ultrasonic wave, which then coagulated into gel at room temperature. The gels were thoroughly washed by using hot (90 °C) polyvinyl alcohol (PVA)...
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