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INDONESIA
Jurnal Biofisika
Published by Institut Pertanian Bogor
ISSN : 18296009     EISSN : -     DOI : -
Core Subject : Science,
Biochemistry, Genetics & Molecular Biology
Jurnal Biofisika terbit 2 kali dalam setahun. Dikelola oleh Departemen Fisika, Institut Pertanian Bogor.
Arjuna Subject : -
Articles 6 Documents
 1 
Search results for , issue "Vol. 8 No. 2 (2012): Jurnal Biofisika" : 6 Documents clear
PEMBUATAN SENSOR GAS H2S BERBASIS POLYANILINE FIELD EFFECT TRANSISTOR (PFETs) DENGAN METODE CASTING Taofik Jasa Lesmana
Jurnal Biofisika Vol. 8 No. 2 (2012): Jurnal Biofisika
Publisher : Jurnal Biofisika

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Abstract

H2S  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.
KINETIKA ADSORPSI AMMONIUM DARI KOPOLIMER SELULOSA JERAMI PADI DENGAN ASAM AKRILAT DAN AKRILAMIDA Wina Yulianti
Jurnal Biofisika Vol. 8 No. 2 (2012): Jurnal Biofisika
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Abstract

Copolymerization  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'N-methylene  bis  acrylamide.  Superabsorbent  produced  is anionic,  that  can  bind  ammonium  cation.  The  kinetics  of  swelling  adsorption  was following pseudo second-order equation.
SINTESIS DAN SIFAT MEKANIK BIOKOMPOSIT SERAT HELICONIA-POLIESTER Akhiruddin Maddu
Jurnal Biofisika Vol. 8 No. 2 (2012): Jurnal Biofisika
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Abstract

In 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°C
SIFAT KAPASITANSI PARALEL, INDUKTANSI PARALEL, DAN KONDUKTANSI BISKUIT (KERAS) DALAM KEMASAN ALUMUNIUM FOIL DAN PLASTIK Erna Rusliana M Saleh
Jurnal Biofisika Vol. 8 No. 2 (2012): Jurnal Biofisika
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Abstract

Knowledge 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 Siemens
SINTESIS NANOPARTIKEL SERAT RAMI DENGAN METODE ULTRASONIKASI UNTUK APLIKASI FILLER BIONANOKOMPOSIT D Kurniawan
Jurnal Biofisika Vol. 8 No. 2 (2012): Jurnal Biofisika
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Abstract

Synthesis  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 DAN KARAKTERISASI β-TRICALCIUM PHOSPHATE DARI CANGKANG TELUR AYAM DENGAN VARIASI SUHU SINTERING Kiagus Dahlan
Jurnal Biofisika Vol. 8 No. 2 (2012): Jurnal Biofisika
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Abstract

β-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 µm

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