摘要:

A review on glasses for biomedical applications with particular emphasis on calcium-iron-phosphate type glasses is presented. A wide range of glass forming compositions exist in the system which can provide materials having the needed mechanical and biochemical properties. The redox state of iron containing glasses is sensitive to melting atmosphere which in turn also affects their chemical and physical properties. Calcium phosphate glasses are diamagnetic, whereas calcium-iron-phosphate glasses are paramagnetic. A few spontaneously crystallized materials, exhibiting ferrimagnetic behaviour, are biocompatible. A few orthopaedic devices, designed and fabricated into composite forms using fibres produced from these compositions and polylactic acid (PLA) polymer, are being evaluated at present. Potential products and research issues have also been identified and discussed.

ISSN:0371-750X    

DOI:10.1080/0371750X.1995.10804668

出版商:Taylor & Francis    

年代:1995

数据来源: Taylor

摘要:

Surface of SiC obtained from rice husk at 1500°-1800°C has been studied by AES before and after sputtering. Presence of Si, C, O and F in the surface is indicated. Binding energies of these elements with intensity, area and other observations are tabulated. Individual spectra of the elements are presented and difference between sputtered and unsputtered surface is brought out.

ISSN:0371-750X    

DOI:10.1080/0371750X.1995.10804669

出版商:Taylor & Francis    

年代:1995

数据来源: Taylor

摘要:

Window glasses in prolonged contact with water develop relatively thick layer crusts due to attack of corrosive environment. In the present study the corrosion behaviour of polished window glasses in plain water and in the presence of sulphate and fluoride as well as chloride aggressive ions in water have been examined at atmospheric temperature ranging from 25°to 30°C. A study regarding the morphological changes in upper layer of window glasses has been carried out with the help of optical microscopy. From these studies, it is evident that the attack on window glasses is much more in the presence of sulphate and fluoride aggressive ions as compared to that of chloride ions. Transmittance of corroded window glasses has also been recorded.

ISSN:0371-750X    

DOI:10.1080/0371750X.1995.10804670

出版商:Taylor & Francis    

年代:1995

数据来源: Taylor

摘要:

Alcoholic solutions of silicon ethoxide (TEOS) were ammonolysed with dry ammonia and the reactions led to formation of amines, alcohol and silica sol. On ageing, the sol gelled to a monolithic mass. The gels produced by the non-aqueous route vitrified to clear silica glass in the temperature range 1100°-1200°C, depending on the thickness of the samples. The refractive index and density of the glass were nearly the same as those for vitreous silica.

ISSN:0371-750X    

DOI:10.1080/0371750X.1995.10804671

出版商:Taylor & Francis    

年代:1995

数据来源: Taylor

ISSN:0371-750X    

DOI:10.1080/0371750X.1995.10804672

出版商:Taylor & Francis    

年代:1995

数据来源: Taylor

ISSN:0371-750X    

DOI:10.1080/0371750X.1995.10804673

出版商:Taylor & Francis    

年代:1995

数据来源: Taylor

ISSN:0371-750X    

DOI:10.1080/0371750X.1995.10804674

出版商:Taylor & Francis    

年代:1995

数据来源: Taylor

ISSN:0371-750X    

DOI:10.1080/0371750X.1995.10804675

出版商:Taylor & Francis    

年代:1995

数据来源: Taylor

ISSN:0371-750X    

DOI:10.1080/0371750X.1995.10804676

出版商:Taylor & Francis    

年代:1995

数据来源: Taylor