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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. 1 (2012): Jurnal Biofisika" : 6 Documents clear
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.
EFFECT OF RATTAN BARK NANOFIBER MICROSTRUCTURE WITH HIGH ENERGY MILLING METHOD TO QUALITY MECHANICAL BIOCOMPOSITES F.N. Ferdiyan
Jurnal Biofisika Vol. 8 No. 1 (2012): Jurnal Biofisika
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Abstract

Rattan  bark  fiber  is  waste  of  raw  rattan  production  activities.  It  usually  used  for roofing  houses  and  strap  goods  in  the  traditional  markets.  Rattan  bark  fiber containing about 40% cellulose, which was potential to be used as filler for composite applications.  Nanotechnology  based  nanoparticles  with  High  Energy  Milling  (HEM) has been applied in this research to find the optimum particle size to be implemented as automotive component filler. Three HEM has been applied (1 hour, 5 hours, and 10 hours), and without HEM (0 hours) as control. Measurable particle size is the size of the single particle. Data in the form of  particle size distributions, intensity, number and volume of distribution, so it can  be assumed to describe the overall condition of the sample. The result shows that 5 hours milling produce the smallest particle size (16.22 nm) and  z averages (129.78 nm). Particle Size Analy zer (PSA) results was related to the Scanning Electron Microscopy (SEM) images of 5 hour milling, particle become smaller and look the same or homogeneous as balls. These results  indicate that the cellulose in the form of three-dimensional nanoparticles is spherical, and the mechanical tests show that biocomposite rattan bark fiber performance was highest among  the  other  natural  composites  (kenaf,  acacia,  water  hyacinth,  banana, coconut).
SINTESIS DAN KARAKTERISASI β-TRICALCIUM PHOSPHATE BERBASIS CANGKANG KERANG RANGA PADA VARIASI SUHU SINTERING N. Selvia
Jurnal Biofisika Vol. 8 No. 1 (2012): Jurnal Biofisika
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Abstract

Many  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.

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