Institut Ruđer Bošković Bijenička cesta 54, Zagreb
Zavod
Division of materials chemistry
Laboratorij
Laboratory for precipitation processes
Grad
Zagreb
Ulica i broj
Bijenička c. 54
Krilo/Kat/Soba
VII building/basement/room 009
Način korištenja instrumenta
, ,
Popis ovlaštenih korisnika
Damir Kralj
Branka Njegić Džakula
Jasminka Kontrec
Broj istovrsnih instrumenata u ustanovi
1
Ime i prezime
Damir Kralj
Titula
Dr. sc.
E-mail
damir.kralj@irb.hr
Telefon
468 0207, internal: 1346
Ime i prezime
Branka Njegić Džakula
Titula
dr. sc.
E-mail
Branka.Njegic.Dzakula@irb.hr
Telefon
457 1343, internal:1588
Model
Coulter Counter Multisizer II
Princip rada i mjerna tehnika
A Coulter counter is an instrument for counting and sizing particles suspended in electrolytes. In a instrument, a tube with a small aperture on the wall is immersed into a container in which particles are suspended in a low-concentration electrolyte. Two electrodes, one inside the aperture tube and one outside the tube create a current path through the electrolyte when an electric field is applied. The impedance (effective resistance) between the electrodes is then measured. The aperture therefore creates a "sensing zone" and particles suspended in the electrolyte can be counted by passing them through the aperture.
As a particle passes through the aperture, a volume of electrolyte equivalent to the immersed volume of the particle is displaced from the sensing zone. This causes a short-term change in the impedance across the aperture which can be measured as a voltage or current pulse. The pulse height is proportional to the volume of the sensed particle.
