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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. 9 No. 1 (2013): Jurnal Biofisika" : 6 Documents clear
TRANSISTOR FILM TIPIS ORGANIK BERBASIS POLIANILIN UNTUK APLIKASI SENSOR GAS AMONIAK Taofik Jasa Lesmana
Jurnal Biofisika Vol. 9 No. 1 (2013): Jurnal Biofisika
Publisher : 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.

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