Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53263#.VLiDr8nQrzE Author(s)   Hans Roggendorf * , Matthias Fischer , Robert Roth , Reinhold Godehardt Affiliation(s) Institut für Physik, Martin-Luther-Universität Halle-Wittenberg, Halle (Saale), Germany . ABSTRACT Industrially produced sodium water glasses were dried in climates with controlled temperature and humidity to transparent amorphous water containing sodium silicate materials. The water glasses had molar SiO 2 :Na 2 O ratios of 2.2, 3.3 and 3.9 and were dried up to 84 days at temperatures between 40°C and 95°C and water vapour pressures between 5 and 40 kPa. The materials approached final water concentrations which are equilibrium values and are controlled by the water vapour pressure of the atmosphere and the microstructure of the solids. The microstructure of the dried water glasses was characterized by atomic force microscopy. It has a nano...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=52522#.VJpSMcCAM4 Author(s)      Leave a comment Kazuo Onuma 1* , Mayumi Iijima 2 Affiliation(s) 1 National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan . 2 School of Dentistry, Asahi University, Mizuho, Japan . ABSTRACT Dissolution of the (100) face of octacalcium phosphate (OCP) single crystal in weak acidic solutions (pH = 6.5; 25 ° ; C) was observed in situ using atomic force microscopy. Monomolecular steps (2.0 nm high) were observed; they originated from etch pits or crystal edges. Advancement of the dissolution process led to precipitation of nanoparticles as small as ~1...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=47892#.VEdE2FfHRK0 Author(s) Francis N. Muya , Lisebo Phelane , Priscilla G. L. Baker , Emmanuel I. Iwuoha Affiliation(s) SensorLab, Department of Chemistry, University of the Western Cape, Bellville, South Africa . SensorLab, Department of Chemistry, University of the Western Cape, Bellville, South Africa . SensorLab, Department of Chemistry, University of the Western Cape, Bellville, South Africa . SensorLab, Department of Chemistry, University of the Western Cape, Bellville, South Africa . ABSTRACT Polysulfone (PSF) membranes are frequently used in ultrafiltration, due totheirchemical and structural stability and mechanical r...