Structure and Properties of Some Bio-Glasses Name of candidate
غادة الامير اسماعيل شهاب;
Abstract
Recently, there is a strong need for the development of biomaterials that can
.. physically support medical treatment.
Borate glass is one of the bio-glasses which have potential in biomedical applications, radiation shielding for gamma rays and neutrons which related to high absorption of neutron. Radioactive waste disposal using vitreous solid for containment. Borate glasses are also commonly used materials in the field of opto-acoustical electronics, in nonlinear devices for frequency conversion in the ultraviolet region, piezoelectric actuator, electronic products and medical devices.
The structure of B203 is also, interest because there are two types of basic structural units tetragonal B04 units, and trigonal B03 units. With addition of alkali oxide to glassy B203 gradual change in coordination number of boron from three to four or reversed [ B03B04] happen.
The present investigation represents a detailed study of the borate glass system:
Where, x= 5, 10, 15, 20, 25, 30, 35 mol. %.the borate glasses were prepared by melt quenching technique. The studies have been carried out seeking more useful information about the behaviour and properties of these types of borate glasses.
Determination of glass temperatures (Tg) was carried out usmg (DSC) technique. revealed that decreases in (Tg) values with increasing ZnO content from 0 to 35 mol. %, that attributed to forming role of ZnO which competes with B203 for oxygen atoms supplied by Na20 describing the decrease in the formation of B04 units and consequently the decrease in connectivity of network structure.
.. physically support medical treatment.
Borate glass is one of the bio-glasses which have potential in biomedical applications, radiation shielding for gamma rays and neutrons which related to high absorption of neutron. Radioactive waste disposal using vitreous solid for containment. Borate glasses are also commonly used materials in the field of opto-acoustical electronics, in nonlinear devices for frequency conversion in the ultraviolet region, piezoelectric actuator, electronic products and medical devices.
The structure of B203 is also, interest because there are two types of basic structural units tetragonal B04 units, and trigonal B03 units. With addition of alkali oxide to glassy B203 gradual change in coordination number of boron from three to four or reversed [ B03B04] happen.
The present investigation represents a detailed study of the borate glass system:
Where, x= 5, 10, 15, 20, 25, 30, 35 mol. %.the borate glasses were prepared by melt quenching technique. The studies have been carried out seeking more useful information about the behaviour and properties of these types of borate glasses.
Determination of glass temperatures (Tg) was carried out usmg (DSC) technique. revealed that decreases in (Tg) values with increasing ZnO content from 0 to 35 mol. %, that attributed to forming role of ZnO which competes with B203 for oxygen atoms supplied by Na20 describing the decrease in the formation of B04 units and consequently the decrease in connectivity of network structure.
Other data
| Title | Structure and Properties of Some Bio-Glasses Name of candidate | Other Titles | تركيب خصائص بعض الزجاج الحيوي | Authors | غادة الامير اسماعيل شهاب | Keywords | No KeyWoard | Issue Date | 2010 |
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