Jurnal Biofisika
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UJI SIFAT ELEKTRONIK FILM Bax Sr1-xTiO3 DENGAN METODE WERNER
Get PDFIn this study, BaxSr1-xTiO3(BST) films were grown on p-silicon substrates using chemical solution deposition (CSD) and were annealed at 850oC for 15 hours. Then contact were made on its. Measurement of electrical properties has been observed using sourcemeter and then its were analyzed using werner method to extract seriesresistance and ideality factor. Then value of series resistance w as used to correct voltage data Vd. Then graphs of Vd – Ln I were analyzed to extract saturation current, barrier potential and ideality factor. The increasing of mol fraction of Ba caused increasing in saturation current and reduces value of series resistance, ideality factor and barrier potential
X-RAY RADIOGRAPHIC STUDY OF β-TRICALCIUM PHOSPHATE BIOCERAMICS AS A TOOTH FILLER
Get PDFPreservation of alveolar bone following tooth extraction is an important step in dental practices before dental implant placement. This study reported the use of β-TCP as a tooth filler to maintain the desired alveolar ridge dimension and stimulate the bone healing processes in the area of tooth loss. The β-TCP used in this study is pure β-TCP made of chicken eggshells. The corresponding β-TCP was mixed with chitosan 2% to get β-TCP pellet for biocompatibility testing. Biocompatibility testing of β-TCP on lower incisor was performed in rabbits and sheep as animal model. Animal models (rabbits and sheep) implanted with β-TCP demonstrated the expected results. The x-ray radiograph of rabbit’s jaw showed the formation of complete tooth and tooth growth at D+30 PO on alveolar socket. Moreover, the x-ray radiographs of sheep’s jaw indicated no change on mesiodistal of the edentulous area. It was obvious that the corresponding β-TCP could accelerate the formation of complete tooth on rabbit, minimize the postextraction bone loss and maintain the alveolar ridge dimension on sheep
STUDI FLUORESENS FIKOSIANIN DARI MIKROALGA Spirulina platensis DAN FOTOSENSITISASI NANOPARTIKEL TiO2 ANATASE
Get PDFThe electron injection (photosensitization) between titanium oxide (TiO2) nanoparticle and phycocyanin has been studied. The TiO2 nanoparticle was synthesized by sol gel method using TiCl4 as titanium source and H2SO4 as hydrolysis phase. XRD pattern showed crystalline phase (anatase phase) when annealed at temperature 600oC. According to the XRD pattern and SEM images, crystal size and particle size were 49.30 nm and 44.91 nm, respectively. The optical measurement of TiO2/phycocyanin hybrid film carried out using UV-Vis spectrophotometer. Phycocyanin has structure which conjugated double bonds, such as carboxyl (-COOH) group can be explored its potential as anchoring group to TiO2 semiconductor surface. The strongest absorption peak of phycocyanin observed at wavelength 619.36 nm with relaxation energy 2.945 eV. Moreover, the maximum emission spectrum as observed at wavelength 708.55 nm and relaxation energy 2.793 eV. It was one of the characteristic pigment suitable used as a sensitizer in solar cell. Additional of phycoyanin increased absorption spectrum from UV to visible region and indicated well efficiency in solar cell application like DSSC
POTENSI METODE OPTIK UNTUK PENDUGAAN KANDUNGAN ANTOSIANIN PADA BUAH BLACK MULBERRY DAN STROBERI
Get PDFEstimation of pigment in plant tissues can be studied from optical properties. Reflectance spectra of optics signal on black mulberry and strawberry fruit have been studied for nondestructive estimation of anthocyanin pigment content. In addition, the absorbance spectra were also studied in fruit extracts with different solvent types, ie: a combined solution of tartaric acid and ethanol - chloric acid. The results showed that there is energy absorption for chlorophyll a in the blue area, i.e.: 465 nm- black mulberry and 478 nm-strawberry. While the energy absorption for chlorophyll b occurs in the red region with a wavelength of 650 nm (black mulberry) and 655 nm (strawberry). Maximum peak absorbance of anthocyanin pigments of black mulberry fruit with tartaric acid solvent had occurred at 515 nm. While for the solvent ethanol -hydrochloric acid has occurred at a wavelength of 519 nm
TRANSISTOR FILM TIPIS ORGANIK BERBASIS POLIANILIN UNTUK APLIKASI SENSOR GAS AMONIAK
Get PDFThin-film transistor has been fabricated by chemical deposition of polyaniline on top of the SiO2 dielectric layer. Thin-film transistors made electrically tested to see the effects of terrain characteristics and sensitivity to ammonia gas. Negative gate voltage is supplied to the transistor polyaniline increases the drain current flowing. Polyaniline transistor drain current decreased when ammonia gas is given which shows that the NH3 molecules reduce the carrier mobility in polyanilin
SIFAT MEKANIK BIONANOKOMPOSIT FILLER NANOPARTIKEL BIOMASS KULIT ROTAN METODE INJEKSI MOLDING
Get PDFRattan biomass is one of the agricultural waste that can be used as a source of cellulose nanoparticle. To produce cellulose nanoparticle bark rattan that is low density, good mechanical properties, natural resources and renewable resources needed a new method of development nanotechnology using hummer mill methods. The purpose of this study is synthesis and mechanical properties of bionanocomposite reinforce cellulose nanoparticle bark rattan used injection moulding. Cellulose nanoparticle is made with mechanical systems (milling and shakers) in size 75 μm and hummer mill t =30 minute. PSA test results produced a maximum particle size of 25.6 nm (number distribution commulant method) at the t =30 minute. Meanwhile, the hardness and impact strength of bionanocomposite show 79.9 HRR and 67.7 J/m
STUDI ELEKTROKIMIA POLIANILIN KOMPOSIT ELEKTRODA PASTA KARBON
Get PDFPolyaniline is widely used as a material for manufacturing electrodes such as biosensor, biofuel cell, and supercapacitor application in nanocomposite forms. In this study, polyaniline has been synthesized in emeraldyne salt forms by interfacial polymerization method and synthesized nanocomposite electrode of polyanilinecarbon paste. The polyaniline morphology was characterized by X - Ray Diffraction (XRD ) , Scanning Electron Microscopy ( SEM ), Transmission Electron Microscope (TEM) and Fourier Transform Infrared (FTIR). In XRD pattern showed crystal type was polyaniline nanofiber semicrystalline. The SEM image showed polyaniline morphology which nanoparticle formed. The TEM result estabilished nano-size indicated by diameter size about 60 -80 nm, FTIR result showed that polyaniline which synthesized was conductive polyaniline forms or called emeraldine salt (ES). Electrochemical studies showed that nanocomposite electrode of polyaniline-carbon paste be able to increased the ion transfer efficiency in the composite electrode. Voltammograms of nanocomposite electrode of polyaniline-carbon paste seen at a potential 0,5V aniline oxidation peaks and reduction peaks seen at -0.1 V Both of these curves peaks (oxidation and reduction was not observed clearly)
OPTIMASI TEKNOLOGI PRODUKSI NANOFIBER SELULOSA BAMBU AMPEL (Bambussa vulgaris)
Get PDFBamboo Ampel (bambussa vulgaris) is one of the lignocellulose -containing plants. Easy cultivation and a brief period of growth illustrate the potential of bamboo as a substitute for the use of synthetic fibers. Production process to produce fibers in the size of the nanofiber is the focus in this study. Semi-chemical pulping processed with NaOH done to soften and separate the cellulose fibers. Mechanical processed with disc refiner for atrial fibers (for 4, 7, 10, 13, and 16 times) do well in order to know fibrillation process optimization. Microfibrils which are formed during the ultrasonic wave treatment applied for 2 hours to change the size of the microfibrils into a nanofiber. The results of the treatment were dried with freeze dryer, and then analyzed using a scanning electron microscopy (SEM ) and X - ray diffraction ( XRD ). The results of the SEM analysis showed that the duration of mechanical processes will affect the size of the resulting cellulose microfibrils. Mechanical process 16 times, which has been treated ultrasonic , produce cellulose microfibrils with 480 nm size and crystallinity of cellulose based on the JCPDS ( ICDD ) cellulose ( C6H10O5 ) X has a monoclinic structure for a = 7.87, b = 10.31, c = 10, 13 and α = Ɣ = 90 ≠ β =122.0 , hkl values ( position crystalline cellulose ) are in the field of 002 ( 20 639 )
PERPINDAHAN PANAS PADA AEROPONIK CHAMBER DENGAN APLIKASI ZONE COOLING
Get PDFEnergy cooling zone on aeroponics system for seed potato production in the lowland humid tropics can be analyzed based on the principle of heat transfer. Heat transfer occurring radiation, conduction, and convection. From the calculation of electrical load aeroponics system with cooling zone for seed potato production in lowland obtained that the cooling zone temperature of 10°C requires the greatest energy. The amount of electrical energy use on a daily average aeroponic chamber amounted to 0.132 kWh/m2 control, a temperature of 15°C for 0590 kWh/m2 and a temperature of 20°C for 0439 kWh/m
PEMBUATAN SENSOR GAS H2S BERBASIS POLYANILINE FIELD EFFECT TRANSISTOR (PFETs) DENGAN METODE CASTING
Get PDFH2S gas sensor has been made based on Field Effect Transistors (FETs) with polyaniline (PANI) as the active layer of the sensor. PANI layer was grown on top of a dielectric material (SiO2) with a casting method. Optical properties of the dielectric layer tested to see present layers as one constituent sensor. Sensor electrically tested to see the effect of terrain characteristics and sensitivity to H2S gas. Drain current increases with increasing negative gate voltage. The interaction of sensor with the H2S is indicated by the increasing drain current when increased concentrations of H2S gas