Antimicrobial glass and glass-like products and method of preparing same
An anti-microbial, glass technology, applied to the sheet or plate of material, in the field of preparation of such glass and glass-like substrates, capable of solving problems such as not being raised
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Embodiment 1
[0045] Preparation of silver ion precursor material: Dissolve 0.125 grams of silver nitrate in 7 drops of concentrated ammonia, then add the resulting ammonia solution to 50 grams of Ferro C38 TM In screen printing oil. The resulting mixture was shaken vigorously for 1 minute and allowed to stand for 2 hours to form a homogeneous dark amber oil. The silver ion precursor material was screen printed onto pre-washed 3 inch square float glass disks using a 305 mesh screen. The screen printed float glass was dried at 105°C for 30 minutes in an upright tong pan and then heated to 620°C for 3 minutes. Upon cooling to ambient temperature, the glass dish becomes transparent and assumes a uniform light yellow-brown color (b * <6). Compared with an untreated glass substrate (control) by confocal microscopy, the silver ion-treated glass substrate was found to exhibit considerable red fluorescence, thus showing that the silver ion-treated glass substrate is toxic to microorganisms . T...
Embodiment 2
[0047] The silver ion precursor material was prepared by carefully grinding 0.125 g of silver nitrate with a mortar and pestle. From a 50 gram batch of Ferro C38 TM Add 5 drops of the screen printing oil to the mortar and continue grinding until a homogeneous suspension of milky consistency is obtained. The resulting suspension was recovered and the remainder of the 50 g of screen printing oil was added. The resulting mixture was stirred and allowed to stand for 2 hours, whereby a dark amber oil formed. The dark amber oil was screen printed onto pre-cleaned 3 inch square float glass dishes using a 305 mesh screen. The screen printed float glass was dried at 105°C for 30 minutes in an upright tong pan and then heated to 620°C for 3 minutes. Upon cooling to ambient temperature, the glass dish becomes transparent and assumes a uniform light yellow-brown color (b * <6), and found to be toxic to microorganisms.
Embodiment 3-7
[0048] Embodiment 3-7 (comparative embodiment)
[0049] In Examples 3-6, the process of exchanging the alkali metal ions in the glass with silver ions has been roughly described in Japanese publication No. 10-158037, except that the glass matrix was immersed in a molten silver nitrate bath and the heating time was different, and only time as shown in Table 1 below. In each example, molten silver nitrate was heated to a temperature higher than the melting point temperature of silver nitrate but lower than the glass transition temperature of the glass matrix, as disclosed in said Japanese publication. The preparation procedure in Example 7 was as described in Example 1 except for the following differences: 0.028 g of the silver ion precursor was screen printed onto a glass substrate and the dried screen printed silver ion precursor material was heated at 604°C only 2 minutes to produce a clear, substantially colorless antimicrobial glass matrix containing about 0.0168 mole pe...
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