THE EFFECT OF RICE HUSK SILICA VARIATION ON THE SURFACE STRUCTURE AND HYDROPHOBIC PROPERTIES OF PDMS SHEETS. PoP : Pillar of Physics [Internet]. 2025 Oct. 31 [cited 2026 Apr. 19];18(2):65-70. Available from: https://pop.ppj.unp.ac.id/index.php/pop/article/view/9