Reološka svojstva koloidnih suspenzija koje sadrže mikro/nano Al2O3 prah

undergraduate thesis

• Title (english): Rheological properties of colloidal suspensions which contain micro/nano Al2O3 powder
• Author: Stjepan Družinec
• Mentor: Lidija Ćurković (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2019-09-26, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

U ovom radu prikazan je utjecaj različitog udjela nano Al2O3 praha na reološka svojstva vodenih suspenzija koje sadrže mikro Al2O3 prah.
U tu svrhu pripravljene su četiri 70%-tne Al2O3 suspenzije s različitim masenim udjelom nano Al2O3 praha. Za stabilizaciju svih suspenzija korišteno je 0,4% disperzanta Dolapix CE-64. Pripravljene 70%-tne suspenzije sadržavale su: (i) čisti mikro Al2O3 prah (0% nano Al2O3 prah), (ii) 99 % mikro Al2O3 prah i 1 % nano Al2O3 praha, (iii) 95 % mikro Al2O3 prah i 5 % nano Al2O3 praha te (iv) 90 % mikro Al2O3 prah i 10 % nano Al2O3 praha. Suspenzije su pripravljene homogenizacijom u planetarnom kugličnom mlinu, nakon čega im je izmjerena pH vrijednost i određena reološka svojstva. Viskozimetrom su snimljene krivulje tečenja: ovisnost viskoznosti o brzini smicanja i ovisnost smičnog naprezanja o brzini smicanja.

Abstract (english)

In this paper the influence of varying amounts of nano Al2O3 powder on rheological properties of micro Al2O3 powder suspensions is described.
For that purpose four 70 wt. % Al2O3 suspensions, with varying amounts of nano Al2O3 powder, were made. To achieve suspension stability, 0.4 wt. % of Dolaphix CE-64 dispersant was used in each suspension. The first supenson did not contain any nano Al2O3 powder, while the rest contained 1 wt. %, 5 wt. % and 10 wt. % of nano Al2O3 powder, respectively. The prepared suspensions were homogenized in a planetary ball mill, pH values and rheological properties were measured. Viscosimeter was used to record flow curves: viscosity vs. shear rate curve and shear stress vs. shear rate curve.

• Keywords: Al2O3 suspenzije; reološka svojstva
• Keywords (english): Al2O3 suspensions; rheological properties
• Language: croatian
• URN:NBN: urn:nbn:hr:235:535586
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-09-22 16:49:39