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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 31 Documents
 1   2   3   4 
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
SINTESIS DAN KARAKTERISASI SIFAT MEKANIK BIOKOMPOSIT FILLER SHORT FIBER KULIT ROTAN HASIL FERMENTASI Atin A. Anggraeni
Jurnal Biofisika Vol. 8 No. 1 (2012): Jurnal Biofisika
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Abstract

Rattan 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.
SIFAT LISTRIK MEMBRAN SELULOSA ASETAT - TITANIUM DIOKSIDA Jajang Juansah
Jurnal Biofisika Vol. 8 No. 1 (2012): Jurnal Biofisika
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Abstract

Membrane  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 SCAFFOLD ALGINAT-KITOSAN-KARBONAT APATIT SEBAGAI BONE GRAFT MENGGUNAKAN METODE FREEZE DRYING M R Aufan
Jurnal Biofisika Vol. 8 No. 1 (2012): Jurnal Biofisika
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Abstract

Scaffold 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 SENYAWA KALSIUM FOSFAT DENGAN TEKNIK PRESIPITASI SINGLE DROP I.P. Ramadani
Jurnal Biofisika Vol. 8 No. 1 (2012): Jurnal Biofisika
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Abstract

The 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.

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