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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 
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
Publisher : 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.
TRANSISTOR FILM TIPIS ORGANIK BERBASIS POLIANILIN UNTUK APLIKASI SENSOR GAS AMONIAK Taofik Jasa Lesmana
Jurnal Biofisika Vol. 9 No. 1 (2013): Jurnal Biofisika
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Abstract

Thin-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 polyaniline
PERPINDAHAN PANAS PADA AEROPONIK CHAMBER DENGAN APLIKASI ZONE COOLING Eni sumarni
Jurnal Biofisika Vol. 9 No. 1 (2013): Jurnal Biofisika
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Abstract

Energy  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/m2
OPTIMASI TEKNOLOGI PRODUKSI NANOFIBER SELULOSA BAMBU AMPEL (Bambussa vulgaris) . Fakhruzy
Jurnal Biofisika Vol. 9 No. 1 (2013): Jurnal Biofisika
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Abstract

Bamboo 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 ).
POTENSI METODE OPTIK UNTUK PENDUGAAN KANDUNGAN ANTOSIANIN PADA BUAH BLACK MULBERRY DAN STROBERI Jajang Juansah
Jurnal Biofisika Vol. 9 No. 1 (2013): Jurnal Biofisika
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Abstract

Estimation  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.
SIFAT MEKANIK BIONANOKOMPOSIT FILLER NANOPARTIKEL BIOMASS KULIT ROTAN METODE INJEKSI MOLDING siti nikmatin
Jurnal Biofisika Vol. 9 No. 1 (2013): Jurnal Biofisika
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Abstract

Rattan  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 FLUORESENS FIKOSIANIN DARI MIKROALGA Spirulina platensis DAN FOTOSENSITISASI NANOPARTIKEL TiO2 ANATASE Supu Idawati
Jurnal Biofisika Vol. 9 No. 1 (2013): Jurnal Biofisika
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Abstract

The 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.
SENSOR SUHU BERBASIS BAHAN FERROELEKTRIK FILM Ba0,55 Sr0,45TiO3 (BST) BERBANTUKAN MIKROKONTROLER ATMEGA 8535 Ridwan Siskandar
Jurnal Biofisika Vol. 9 No. 2 (2013): Jurnal Biofisika
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Abstract

Growth of pure Ba0.55Sr0.45TiO3 (BST) film on p-type silicon (100) substrates with two treatments on the enhancement and depletion (pretreatment of the substrate which is heated up to first at a temperature of 800°C for 15 hours before the spilled  solution BST) with the method Chemical solution Deposition (CSD) and spin coating at 3000 rpm  rotational  speed  for  30  seconds.  Films  (both  on  the  type  of  enha ncement treatment and type of deples treatment) in put on top of the substrate is then heated at a temperature of 800oC, 850oC and 900oC for 15 hours . Of BST film obtained was then carried out the characterization of the value range, sensitivity, resolution BST films, the level of accuracy and hysteresis.  Results showed that 850 oC enhancement BST  film  is  the  best  film  that  can  be  used  as  a  temperature  sensor  to  read  the changes in the environment (temperature only)  ATMega8535 based microcontroller. Output (voltage generated) amplified by differential amplifier circuit and non-inverting amplifier.  Subsequently  processed  into  digital  data  output  on  the  Analog  Digital Converter  (ADC)  internalATMega8535.  Digital  data  is  processed  by  the microcontroller.  Visualization  using  measuring  16x2  Liquid  Crystal  Display  (LCD) display which can change the voltagein units of degrees  celsius ( oC)  when given a BST film temperature stimuli
OPTIMASI KELAJUAN PEMANASAN PADA EKSTRAKSI SILIKON DIOKSIDA (SiO2 ) DARI SEKAM PADI , Masrur
Jurnal Biofisika Vol. 9 No. 2 (2013): Jurnal Biofisika
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Abstract

According to Central Agency Statistics Indonesia,  production rice in 2012 will reach 69.05 million ton. Seeing this, it would appear the main agricultural waste generated from  rice,  the  rice  husk.  Rice  husk  ash  has  the  potential  to  produce  silica. Incineration process of rice husk was performed in a furna ce at temperature of 400oC for  2  hours  and  950oC  for  1  hour,  with  the  increase  rate  0.5oC/minute  and 1.5oC/minute.  The  incineration  yield  then  washed  with  Chloride  acid  3%  (12  mL Chloride  acid  3%  for  1  gram  of  rice  husk  ash)  and  heated  using  hotplate  and magnetic stirrer, with a speed of 240 rpm for 2 hours at 200oC. Furthermore sample washed repeatedly using hot distilled water until free acid using litmus papers, then reheated  in  a  furnace  to  produce  silica.  EDX  results  for  silicon  dioxide  of  about 99.15% (for increase rate 0.5 oC/minute) and 78.96% (for increase rate 1.5oC/minute). Characterization  of  the  silica  using  FTIR  spectroscopy  revealed  the  existence  of functional group (siloxane). Peaks of FT-IR spectrum showed specific peaks related to the present of SiO2 at the wave number range of 1.110 cm-1 to 467 cm-1

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