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This work evaluates the stability with variations of surfactant concentration (Tween 80 and Span 80) in nanoemulsions and preparation of peel-off mask with the active ingredient from Gotukola (Centella asiatica L.) (CaL) extract. The value of zeta potential and the size of nanoemulsion for variations of surfactant concentration were obtained using electrophoretic light scattering (ELS) and dynamic light scattering (DLS) at Horiba Scientific Nano Particle Analyzer SZ-100. Formulate the peel-off mask containing CaL extract nanoemulsion were prepare hydroxypropyl methylcellulose (HPMC) of 1 wt% and polyvinyl alcohol (PVA) at a concentration of 10 wt%. The characterization of the peel-off mask was carried out with Fourier Transform Infra-Red (FTIR), Scanning Electron Microscopy (SEM), organoleptic test, pH, viscosity, spreadability, and drying time during 4 weeks of storage at room temperature. The result showed that formula F3 with the ratio of surfactant concentration between Tween 80 and Span 80 was 5:5 had stable and physical properties with the aspect of the organoleptic test, viscosity, spreadability, and drying time remained unchanged after 4 weeks of storage. [ABSTRACT FROM AUTHOR]

In this research, poly(styrene-co-acrylic acid-Cu) was prepared via emulsion polymerization.Cu contents were varied as 10%, 15% and 20% and mol ratio of styrene to acrylic acid as 1:1 and 2:1. Structure and surface of poly(styrene-co-acrylic acid-Cu) were characterized by FTIR (Fourier Transformed Infra Red), NMR (Nuclear Magnetic Resonance), and SEM/EDX (Scanning Electron Microcope/Energy Dispersive X-Ray) spectroscopy. The NMR spectra showed that the polymer was formed, however FTIR spectra showed that there were still unreacted monomers. SEM-EDX confirmed that copper (Cu) was dispersed uniformly on poly(styrene-co-acrylic acid-Cu) matrix. [ABSTRACT FROM AUTHOR]