Jurnal Biofisika
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SIFAT KAPASITANSI PARALEL, INDUKTANSI PARALEL, DAN KONDUKTANSI BISKUIT (KERAS) DALAM KEMASAN ALUMUNIUM FOIL DAN PLASTIK
Get PDFKnowledge of the dielectric properties of food is very important in research, modeling and development of thermal treatment. Associated with biscuits, crackers knowledge of dielectric properties will be useful for many applications for them to predict future food kadaluarsanya. Terdapat three dielectric parameters measured were parallel capacitance , inductance and parallel conductance on biscuits (hard) with aluminum foil and plastic packaging . The third parameter to measure the dielectric used HIOKI 3532-50 LCR LCR - meter Hitester with pegukuran frequency 42 Hz - 5 MHz in constant current (Constant Current) 1.0 . Results parallel capacitance and inductance measurement parallel pattern looks biscuits decreased with increasing measurement frequency, while the conductance ascending pattern seen with increasing frequency. Biscuits with aluminum foil packaging has a parallel capacitance value 7x10-6 to 22x10-4 Farad, parallel inductance 0.000151 to 3.089 x10 9 and conductance 0.082533 to 22.285529 Siemens. While packing biscuits with platik have capacitance values 5x10-6 to 2.98 x 10-4 Farad, parallel inductance 0.000216 to 236.026 x 10 9 and conductance 0.073310 to 31.210734 Siemen
SIFAT LISTRIK MEMBRAN SELULOSA ASETAT - TITANIUM DIOKSIDA
Get PDFMembrane is a semiperiable tissue. Now days, the technology of membrane is commonly used for separation process. Research membrane filtration process is mostly done, but the investigations of their electrical properties are rarely performed. Electrical properties of membrane were investigated by using measurement of current-voltage, capacitance, and impedance phenomenon at low alternating current. The more value of frequency of signal, the more of conductance value. The capacitance and impedance were decreased If frequency was inclined. The TiO2 addition in cellulose membrane couse the electrical properties of membrane changes. It was happen until optimum value TiO2. The differences in electrical parameters was shaw clearly in the range of 10 Hz to 1 kHz
SINTESIS DAN KARAKTERISASI β-TRICALCIUM PHOSPHATE BERBASIS CANGKANG KERANG RANGA PADA VARIASI SUHU SINTERING
Get PDFMany cases of bone loss triggered growing research of bone biomaterial. Biomaterials are widely used for bone substitution is β-tricalcium phosphate (β-TCP). In this research was done the synthesis of β-TCP based on rangga shells. The use of natural materials (shells) can improve the bioactive properties and biocompatibility in the process of bone healing. Rangga shells obtained from the Riau Islands. Synthesis of β-TCP performed by reacting calcium from rangga shell and H3PO4 with precipitation method at a temperature of 80oC with variations sintering temperature to 800oC, 900oC, 1000oC, 1100oC, 1200oC, and 1300oC. To determine the phase formed in the samples analyzed using X-ray difraction (XRD). XRD pattern shows the presence of peaks belongs to β-TCP, hydroxyapatite (HA), carbonate apatite tipe-A (CAA), and oktacalcium phosphate (OCP). β-TCP optimum form on the β-TCP samples sintering temperature 1200oC holding time 7 hours with the percentage of β-TCP produces by 81,98%. The formation of β-TCP was also stregthened by the results of Fourier transform infrared characterization (FTIR) is characterized by the presence of phosphate (PO43-) and hydroxyl (OH-). Micrograph of scanning electron microscopy (SEM) on sample of β-TCP optimum β-TCP showed in the form of chunks that are composed into a coarse aggregate. β-TCP optimum sample has an average particle size of 693,65 nm were measured using the PSA
SINTESIS DAN KARAKTERISASI SIFAT MEKANIK BIOKOMPOSIT FILLER SHORT FIBER KULIT ROTAN HASIL FERMENTASI
Get PDFRattan bark fiber as synthetic fiber at composite filler replacement has been used in this research. The extraction of the rattan bark fiber are done using a fermenta tion method of Aspergillus niger and milling.The fiber that created are long and short fiber (2 mm) in shape. Biocomposite synthesis using blending-hot press method that suitable with variant mechanical standardization test, ASTM D2240 for hard tools test, ASTM D1822 for pull tools test. Rattan bark fiber act as filler, polypropylene as matrix, and maleat acid as coupling agent. Mechanical measurement test of biocomposite sf (5%) and sm (5%) result shows that the hardest point are 4.33 ±0.17 Mpa. The sf (5%) and sm (5%) biocomposite pulling power are 140.12 ± 0.76 Mpa. Biocomposites filler short fiber rattan skin fermentation method has the potential to be further developed as a multi-functional materials
SINTESIS DAN KARAKTERISASI β-TRICALCIUM PHOSPHATE DARI CANGKANG TELUR AYAM DENGAN VARIASI SUHU SINTERING
Get PDFβ-tricalcium phosphate includes a group of calcium phosphate compounds. β-Tricalcium phosphate was obtained by the chemical reaction of calcium oxide and phosphoric acid using the precipitation method on the solution temperature at 50oC and its sintering temperature varies, which are 800oC, 900oC, 1000oC, 1100oC, 1200oC, and 1300oC. In this study, calcium oxide based on chicken eggshells The characterization results which using x-ray diffractometer shows that the most optimum β-tricalcium phosphate which is fabricated at the sintering temperature of 1000oC with a percentage of 76,97%, the crystal size of 57,47 nm, the degree of crystallinity of 84,51%, while the characterization results which using fourier transform infrared spectrometer identify the existence of the hydroxyl group at the wavenumber of 3600- 3200 cm-1 and the phosphate group at the wavenumber of 1200-500 cm-1. Micrograph of scanning electron microscopy shows that β-tricalcium phosphate shaped with a size of 0,6 µ
KINETIKA ADSORPSI AMMONIUM DARI KOPOLIMER SELULOSA JERAMI PADI DENGAN ASAM AKRILAT DAN AKRILAMIDA
Get PDFCopolymerization of cellulose from rice straw with acrylic acid and acrylamide produce biodegradable superabsorbent Copolymerization was carried out at 65 C under nitrogen athmosphere. Initiator and cross linking agent used were potassium peroxodisulfate and N\u27N-methylene bis acrylamide. Superabsorbent produced is anionic, that can bind ammonium cation. The kinetics of swelling adsorption was following pseudo second-order equation
SINTESIS SCAFFOLD ALGINAT-KITOSAN-KARBONAT APATIT SEBAGAI BONE GRAFT MENGGUNAKAN METODE FREEZE DRYING
Get PDFScaffold is a three dimensional structure that can be used as temporary supporting media in body tissue repairmen process. Some properties that must be owned by the scaffold are porous, biocompatible, biodegradable, bioactive, and have sufficient mechanical strength to sustain the new tissue growth. In this present study, the scaffold will be synthesized for bone tissue repairmen using alginate, chitosan, and carbonate apatite. The variation ratio of alginate and chitosan used in this study was 100% alginate, 2:1. 1:1, 1:2, and 100% chitosan with the same mass of carbonate apatite for each variation, which is 0.1 gram. The results of mixing the three ingredients were then freeze-dried in order to obtain the porous characteristic of the scaffold. From the results of the FTIR, the crosslinking process between the carboxyl groups on alginate characterized by the emergence of the peak at 1620 cm-1 frequency and the ionic bonding between alginate and chitosan are observed. The results of SEM examination stated: first, the properties of porous scaffold is successfully acquired using freeze drying method; second, the variations in the composition of alginate and chitosan as well as the addition of carbonate apatite scaffold affect the structure formed. Composition of alginate: chitosan = 1:1 tends to produce a more dense scaffold compared with other compositions; third, the existence of carbonate apatite is observed on the surface of the scaffold
SINTESIS NANOPARTIKEL SERAT RAMI DENGAN METODE ULTRASONIKASI UNTUK APLIKASI FILLER BIONANOKOMPOSIT
Get PDFSynthesis of nanoparticles was obtained from the hemp fiber ultrasonic method. Nanoparticles hemp fiber is used as bio-nanocoomposite Ultrasonic method of hemp fiber was done with the time variations of surfactant tween 80 3 % as many as 10 samples and 0 % as much as 3 samples. All samples were tested with the Particle Size Analyzer (PSA) to determine the size distribution. The smallest sized fiber was obtained from 105 min sonication with 3 % tween 80, the size is 229.04 nm. Hemp fiber size with concentration of tween 80 3 % smaller than the concentration of Tween 80 0 %. Hemp fibers with nanometer- size 229.04 has a density of 1.1727 g cm - 3 is smaller than 7500 nanometers in size hemp fibers with a density of 1.7083 g cm - 3 . Results of X - ray Diffraction ( XRD ) showed the smallest size hemp fiber hemp is a cellulose fiber , characterized by their crystal phase cellulose is at 22.76 degrees diffraction angle with the degree of crystallinity 21.3727
SINTESIS SENYAWA KALSIUM FOSFAT DENGAN TEKNIK PRESIPITASI SINGLE DROP
Get PDFThe high damage of bone triggers a variety of research about bone biomaterial. So far, compliance for this needed done import materials. The material which used for bone biomaterial is calcium phosphate. In this research used synthesis of calcium phosphate. Synthesis of calcium phosphate performed using precipitation method single drop and wise drop at room temperature with sintering themperature 900 oC, themperature 70oC with sintering time variation (110oC, 300oC, 600oC, and 900oC). Results obtained from sintering are fluffy white powder. Result from x-ray diffraction characteristic for all sample with themperature sintering 900o C show the phase formed is calcium pyrophosphate and other phase from calcium phosphate that is hydroxyapatite, tricalcium phosphate, octacalcium phosphate, carbonate apatite type-A and carbonated apatite type-B. The longer stirring time is so the phase of calcium pyrophosphate formed the less. Reaction themperature is very effect in formation of phase calcium pyrophosphate, because calcium pyrophosphate which the resulting in room themperature is more than in themperature 70 oC. Beside that precursor compound that has not reacted in themperature 70oC less from room themperature, this is because precursor compound is faster when heated. In sintering variation themperature 110oC and 300oC the precursor formed is more and the best sintering themperature is 900oC
SINTESIS DAN SIFAT MEKANIK BIOKOMPOSIT SERAT HELICONIA-POLIESTER
Get PDFIn this study, polyester-fiber heliconia biocomposites has been created and tested on its mechanical properties. Biocomposites was manufactured begins by separating the fibers. it consists of three stages, namely chlorization, alkaline leaching and extraction. After that, the manufacture of composites made with Hand Lay-up techniques. Three samples with variations in fiber content, ie without the addition of fiber, 0.54 g and 2.08 g fiber. Characterization of samples includes tensile test, hardness, and impact. The test results known that the tensile strength and hardness increased with increasing the amount of fiber heliconia. Impact test shows sample values optimum working temperature is 10°