Ultrafiltration of Hematite Sol

Abstract

Ultrafiltration of a laboratory-made hematite sol was studied in a batch cell with an Amicon PM 10 membrane at 298 K. The effects of hematite bulk concentrations (2 to 10 k g .~~-~) , stirring conditions (0 and 400 rpm), and pressure (50 to 350 kPa) were investigated. The permeate flux increases with increasing pressure and stirrer speed, and decreases with increasing hematite bulk concentration. The polarization resistance increases with an increase in pressure and hematite concentration. The polarization resistance is greater under unstirred conditions.

Surface Restructuring of Nanoparticles: An Efficient Route for Ligand−Metal Oxide Crosstalk

“…The seeds of colloidal Fe 2 O 3 nanoparticles were prepared by thermal hydrodialysis of FeCl 3 in water. , Accordingly, the FeCl 3 solution was added dropwise to hot water, and the temperature and rate of component mixing of reactants were carefully controlled. Following the FeCl 3 hydrolysis, the solution was incubated at 75 °C for 24 h and then cooled to room temperature.…”

Utilizing Chemical Raman Enhancement: A Route for Metal Oxide Support-Based Biodetection

“…TiO 2 nanoparticles (5 nm or less in diameter) , and Fe 2 O 3 nanoparticles (∼6 nm in diameter) ,, were synthesized according to established literature procedures. In each synthesis, seed particles first were produced during an acidic hydrolysis step and then grown in size by slowly increasing the pH of the colloid during dialysis.…”

Fe2O3 Nanoparticle Structures Investigated by X-ray Absorption Near-Edge Structure, Surface Modifications, and Model Calculations

“…Sample Preparation. The seeds of colloidal Fe 2 O 3 NP were prepared by thermal hydrodialysis of FeCl 3 in water. , Accordingly, 6.5-nm NP were prepared by dropwise addition of FeCl 3 into hot water, and the temperature and rate of component mixing of reactants were carefully controlled. 3-nm particles were prepared by rapid injection of 10 mL of FeCl 3 into 90 mL of boiling water.…”