Hentihu, M Fahrur Rozy
Jurusan Teknik Mesin Fakultas Teknik Universitas Jember

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FABRIKASI SERAT NANO BERBASIS POLIMER MENGGUNAKAN TEKNOLOGI ELECTROSPINNING Hentihu, M. Fahrur Rozy; Sholahuddin, Imam
ROTOR Vol 8, No 1 (2015)
Publisher : ROTOR

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Abstract

Nano fibers can be fabricated using electrospinning technology using local components at low cost. Electrospinning technology also has advantages to control the morphology, uniformity, porosity and composition of nano fiber by pumping a solution of the gel through the nozzle of a metal-needle high voltage electrified. Based on the results of the research, the general parameters required for the manufacture of electrospinning machine is a resolution rate of spraying the solution (μℓ / min) and the magnitude of the high voltage power source (kV). A human hair is approximately 60 μm size looks larger than the size of the resulting PVA fiber electrospinning machine. These results were confirmed by the results of fiber characterization using the AFM in the area of ​​fiber 50 μm x 50 μm, fiber size in the range of <1 μm are included in the order of 1000 nm. It can be concluded that the electrospinning machine that has been made in this study has been able to create nanometer-scale fibers.
FABRIKASI DAN KARAKTERISASI NANOGENERATOR BERBASIS NANOFIBER-NANOWIRE ZnO Sholahuddin, Imam; Hentihu, M. Fahrur Rozy
ROTOR Vol 8, No 1 (2015)
Publisher : ROTOR

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Abstract

Fiber diffusion process when the fiber is still green on a plate collector and the thermal decomposition process followed by the formation of ZnO crystal nucleation has a very large role of the morphology of the final form of fiber products. Conversely, a positive result occurs in nanowire growth process. At the time of natural air pressure conditions and the presence of oxygen in the air in the process of sintering for 2 hours without using a catalyst, ZnO crystals can grow by itself (self-growth) into a nanowire. As a material nanogenerator, this situation provides an additional active area to excite the tap-off force into electrical voltage of up to 234.55 mV (2 μℓ / min).
PEMANFAAT FREKUENSI BUNYI MATERIAL SEBAGAI DASAR PENGUJIAN MODULUS ELASTISITAS PADA PENGUJIAN TANPA MERUSAK (NON DESTRUCTIVE TEST) Hentihu, M. Fahrur Rozy; Djaelani, Abdul Hadi; Choiron, Moch. Agus
ROTOR Vol 6, No 1 (2013)
Publisher : ROTOR

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Abstract

Elastic modulus of material are usually obtained from tensile test. Tensile test categorized as destructive test. One of destructive test weakness is the testing specimen can not be reused. So we need alternative on elastic modulus test without damaging the specimen (non destructive test). This research aims to determine whether the sound frequency of material can be used as a basic for elastic modulus test as a non destructive test. On this research, two different test performed on the same specimen. First test is testing elastic modulus using sound frequency test (non destructive test) and second test is testing elastic modulus using tensile test (destructive test). Percentage error obtained from comparing percent error between those two tests. The results showed, in testing the elastic modulus of brass specimen has an error percentage of 10.33%, in testing the elastic modulus of aluminium specimen has an error percentage of 4.39%, and in testing the elastic modulus of steel specimen has an error percentage of 1.89%. Keywords: Elastic modulus, Non destructive test, Sound frequency