S.S. Potgieter-Vermaak

article

Influence of Ru additions on the corrosion behaviour of WC–Co cemented carbide alloys in sulphuric acid

J.H. Potgieter, N. Thanjekwayo, P. Olubambi, N. Maledi, more

International Journal of Refractory Metals and Hard Materials > 2011 > 29 > 4 > 478-487

The aim of the study is to investigate the influence of ruthenium (Ru) additions on the corrosion behaviour of WC–Co cemented carbides when exposed in a reducing acid medium. The study involved the characterization of the microstructures, morphologies and phases present by using the optical microscopy, SEM, XRD and Raman spectroscopy before and after corrosion. The corrosion behaviour was investigated...

article

Particulate matter and gaseous pollutants in residences in Antwerp, Belgium

M. Stranger, S.S. Potgieter-Vermaak, R. Van Grieken

Science of the Total Environment > 2009 > 407 > 3 > 1182-1192

This comprehensive study, a first in Flanders, Belgium, aimed at characterizing the residential indoor air quality of subgroups that took part in the European Community Respiratory Health Survey (ECRHS I—1991 and ECHRS II—1996) questionnaire-based asthma and related illnesses studies. This pilot study aimed at the evaluation of particulate matter and various inorganic gaseous compounds in residences...

article

Comparative overview of indoor air quality in Antwerp, Belgium

M. Stranger, S.S. Potgieter-Vermaak, R. Van Grieken

Environment International > 2007 > 33 > 6 > 789-797

This comprehensive study, a first in Belgium, aimed at characterizing the residential and school indoor air quality of subgroups that took part in the European Community Respiratory Health Survey and the International Study of Asthma and Allergy in Childhood [Masoli M, Fabian D, Holt S, Beasley R. Global Burden of Asthma, Medical Research Institute of New Zealand, University of Southampton; 2004.]...

article

Fingerprinting of South African ordinary Portland cements, cement blends and mortars for identification purposes — Discrimination with starplots and PCA

S.S. Potgieter-Vermaak, J.H. Potgieter, A. Worobiec, R. van Grieken, more

Cement and Concrete Research > 2007 > 37 > 6 > 834-843

This investigation is an attempt to analyse some of the current commercial cements and cement blends in South Africa and mortars produced from them (1:3 mixtures of cementitious material with different sands) for a suite of minor and trace elements that will provide a unique fingerprint of the final product. It was found in both the case of the OPC and the blended cements that a suite of such elements...

article

Part II: A micro-Raman study of OPC, slag and fly ash

S.S. Potgieter-Vermaak, J.H. Potgieter, M. Belleil, F. DeWeerdt, more

Cement and Concrete Research > 2006 > 36 > 4 > 663-670

Various attempts to use Raman spectrometry to analyse the mineral phases in hydrated and unhydrated cement have been made and results were published on pure synthesized mineral phases as early as 1976. Limited investigations were reported in the past three decades on pure mineral cement phases, white cement and ordinary Portland cement (OPC) analysed with visible (VIS) excitation at 514.5 and 632...

article

The application of Raman spectrometry to investigate and characterize cement, Part I: A review

S.S. Potgieter-Vermaak, J.H. Potgieter, R. Van Grieken

Cement and Concrete Research > 2006 > 36 > 4 > 656-662

Raman spectrometry has received attention for the past 3 decades in its application to the characterisation of pure cement phases, white and grey cements. Various configurations of instrumentation and laser excitation sources have been used, as reported in a limited number of papers. The first demonstrated investigation in 1976 by Bensted, illustrated the characterisation of various pure mineral cement...

article

Heavy metals removal from solution by palygorskite clay

J.H. Potgieter, S.S. Potgieter-Vermaak, P.D. Kalibantonga

Minerals Engineering > 2006 > 19 > 5 > 463-470

The possible use of palygorskite clay, mined in the Dwaalboom area of the Northern Province of South Africa, as an adsorbent for the removal of metal ions such as lead, nickel, chromium and copper from aqueous solution, was investigated. In this work, adsorption of these metals onto palygorskite has been studied by using a batch method at room temperature. The results of adsorption were fitted to...

article

Comparison of limestone, dolomite and fly ash as pre-treatment agents for acid mine drainage

S.S. Potgieter-Vermaak, J.H. Potgieter, P. Monama, R. Van Grieken

Minerals Engineering > 2006 > 19 > 5 > 454-462

The physical, chemical and biological nature of Vaal Dam water, the main source of water in Gauteng, South Africa, is often affected by underground water pollution (acid mine water) and industrial effluents. The ecological significance and detrimental effects necessitate investigations into treating the water prior to discharge into public streams. Although several acid mine water treatment techniques...

article

An investigation into the feasibility of recovering valuable metals from solid oxide compounds by gas phase extraction in a fluidised bed

J.H. Potgieter, M.A. Kabemba, A. Teodorovic, S.S. Potgieter-Vermaak, more

Minerals Engineering > 2006 > 19 > 2 > 140-146

Recent years have seen the application of the concept of fluidisation extended to different kinds of industrial processes. This technology now plays a central role in the chemical and petrochemical industries, in power generation and in mineral processing and metallurgy. The current research is directed towards gas-phase extraction of metals because of the high yield of recovery that can potentially...

article

A characterisation of the surface properties of an ultra fine fly ash (UFFA) used in the polymer industry

S.S. Potgieter-Vermaak, J.H. Potgieter, R.A. Kruger, Z. Spolnik, more

Fuel > 2005 > 84 > 18 > 2295-2300

Fly ash is the residue from the combustion of pulverised coal in thermal power stations. It consists of a variety of particle sizes of hollow silica-alumina spheres, which can be utilised as a custom made filler material in a number of industries, e.g. plastics, rubber, paint, refractories, etc. The 5μm average particle size fraction is popular for its application in plastic products. In order to...

article

Micro-structural characterization of black crust and laser cleaning of building stones by micro-Raman and SEM techniques

S.S. Potgieter-Vermaak, R.H.M. Godoi, R. Van Grieken, J.H. Potgieter, more

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy > 2005 > 61 > 11-12 > 2460-2467

Research concerning the formation and removal of black crusts on various historical objects is approached from many different angles. The so-called “yellowing effect”, observed after laser treatment for cleaning purposes, has also received a lot of attention. Evidence regarding this phenomenon differs considerably and the actual mechanisms are still speculated on by researchers. In an attempt to elucidate...

INFONA - science communication portal

Search results for: S.S. Potgieter-Vermaak

Influence of Ru additions on the corrosion behaviour of WC–Co cemented carbide alloys in sulphuric acid

Particulate matter and gaseous pollutants in residences in Antwerp, Belgium

Comparative overview of indoor air quality in Antwerp, Belgium

Fingerprinting of South African ordinary Portland cements, cement blends and mortars for identification purposes — Discrimination with starplots and PCA

Part II: A micro-Raman study of OPC, slag and fly ash

The application of Raman spectrometry to investigate and characterize cement, Part I: A review

Heavy metals removal from solution by palygorskite clay

Comparison of limestone, dolomite and fly ash as pre-treatment agents for acid mine drainage

An investigation into the feasibility of recovering valuable metals from solid oxide compounds by gas phase extraction in a fluidised bed

A characterisation of the surface properties of an ultra fine fly ash (UFFA) used in the polymer industry

Micro-structural characterization of black crust and laser cleaning of building stones by micro-Raman and SEM techniques

Filter options

Publication date

Keywords

Journal

INFONA - science communication portal

Search results for: S.S. Potgieter-Vermaak

Add recipient

Sending message cancelled

Are you sure you want to cancel sending this message?

Send message

Filter options

Publication date

Date range setting

Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.

Keywords

Journal

Reporting an error / abuse

Sending the report failed

Accessibility options