A polyvinyl alcohol (PVOH)/lignin nanofiber was prepared by the electrospinning method as a precursor for biodegradable and low-cost carbon fibers. PVOH 15% was dissolved in water, and various concentration of lignin (5, 10, 15, 20, and 25%) was added. The presence of lignin in PVOH solution increased the viscosity and conductivity. From SEM analysis, PVOH solution produced smooth fiber, whereas the addition of lignin produced fibers in bead forms. The presence of lignin above 20% in PVOH did not produce spun-fiber. FTIR analysis confirmed that lignin was able to form hydrogen bonds with PVOH. TGA analysis showed that PVOH/lignin nanofibers had the highest residual mass, i.e., 40% at 600 °C. The morphology of the carbon fibers showed flake forms with many pores and had 58.07% carbon content.

This research implemented a green route to multifunctional nanocomposite materials composed by cellulose nanofiber (CNF) and graphene oxide (GO). Aqueous solutions with different ratio of GO (prepared with LiCl/DMAc 8%(w / v)) were mixed with cellulose nanofiber by using magnetic stirrer at the temperature of 70 o C for 30 minutes. The mixture obtained was dried in room temperature for 24 hours. The nanocomposite were characterized with several analysis such as; Fourier Transform Infrared (FTIR), mechanical properties testing, Transmission Electron Microscope (TEM), and Scanning Electron Microscope (SEM) analysis. The characteristic of cellulose nanofiber functional groups was exhibited through FTIR spectra. The CNF/GO with 0.06wt% indicated a higher mechanical properties compared to the CNF. Its tensile strength increased drastically from 26.36 MPa to 49.69 MPa while its young's modulus also showed an extreme increase from 1.379381 GPa to 6.973478 GPa respectively. Moreover, cellulose nanofiber diameter had been examined through TEM and its morphology was analyzed with SEM. Finally, it can be concluded that the celulose nanofiber mechanical properties can be optimized by graphene oxide through the mixing process.

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This devotional activity has been carried out and runs well in line with the aim of assisting thecommunity of coffee farmers in Buah Raya Village for the management of coffee beans mainly byway of roasting. The tool used is 1 set of coffee cutting equipment equipped with temperaturecontrol and exhaust vapor / hot air to accelerate the cooling process results from roasting. Testingthe production of the tool is done by inserting the coffee beans to be roasting and then setting thetemperature button on the equipment to the temperature used in accordance with the coffee beansare inserted, after finished activate the exhaust steam / hot air and then wait a while for the coffeebeans are cold. Then move the coffee beans to the aluminum plate box as a shelter.