Yasemin L. Mustafa

Yasemin is a current student at QMUL undertaking an MSc in Chemical Research at the School of Biological and Chemical Sciences, whilst working closely alongside the School of Dentistry. Yasemin holds a First Class BSc with Honours in Chemistry attained at QMUL. Her work includes studies of phosphate glasses with both network modifiers and intermediates with specific focus on magnesium oxide and gallium oxide. She has recorded her observations of the role of phosphate glasses as both biomaterials as well as their uses for dental utilisation. In her current experimental project, she is looking entirely new compositions of phosphate glasses whereby she has used neutron diffraction and solid state NMR to reveal the structural role of the crucial glass components. Her experimental skills also involve using a variety of techniques for glass and biomedical cement property characterisation, e.g. thermal analysis, mechanical testing, and FTIR spectroscopy. Yasemin is passionate about continuing her research in glass science and is looking forward to the opportunities to broaden her understanding of the diverse applications in glass science.

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Structure and Properties of Gallium Phosphate Glasses for Novel Bone Cements
*1Yasemin L Mustafa 1Uzma B. Jaffry , 2Natalia Karpukhina, 3Alex C. Hannon and 1Isaac Abrahams
School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London E1 4NS, UK

2Barts and the London School of Medicine and Dentistry, Queen Mary University of London, Mile End Road, London E1 4NS, UK
3STFC ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didicot, Oxon, OX11 0QX, UK

Glass ionomer cements have been used in restorative dentistry for many years and typically consist of a fluoroaluminosilicate glass, which is reacted with a polyalkenoate solution to give the cement. The setting reaction involves diffusion of ions such as Ca2+ and Al3+ to from the glass to crosslink the carboxylate groups of the polymer matrix. Concern over the use of aluminium in vivo has led to research into other potential crosslinking ions. The present work is focused on gallium phosphate-based glasses as possible glass components in glass ionomer cements. Phosphate glasses are of particular interest for use in bone cements since due to their chemical relationship with the inorganic component of natural bone.

Glasses in the Na2O : CaO : Ga2O3 : P2O5 system were synthesised by conventional melt quenching methods and their structures analysed using neutron diffraction and FTIR spectroscopy and 31P, 23Na and 71Ga MAS NMR spectroscopy. Fig. 1 shows total pair correlation functions for selected compositions. The individual correlations for P-O, Ga-O, Ca-O and O-O are clearly visible. The maximum in the gGa-O(r) correlation 1.88 Å lies between the typical tetrahedral and octahedral distances of 1.81 Å and 1.95 Å, respectively and appears to indicate 5-coordinate geometry.  Details of the structure and the cement forming abilities of these glasses are presented.













Figure 1.  Total pair correlation functions for 30:Na2O:(20-x)CaO:(3x/2)Ga2O3:50P2O5