A NEW METHOD FOR THE APPLICATION OF LUMINESCENT SCREENS TO GLASS SURFACES

1935 ◽  
Vol 13a (6) ◽  
pp. 126-132 ◽  
Author(s):  
W. H. Kohl
Keyword(s):  
Heat Treatment ◽  
Chemical Reaction ◽  
Glass Surface ◽  
Physical Characteristics ◽  
New Method ◽  
Sintering Process ◽  
Luminescent Screen ◽  
Uniform Layer ◽  
Glass Surfaces

An outline is given of the various methods for the application of luminescent screens, and their relative merits. Most widespread in use are methods that utilize a liquid binder that enters into a chemical reaction with the glass surface. In other cases, the powder is partially imbedded in the glass surface by a sintering process. The physical characteristics of the luminescent screen are adversely affected by both of these methods. A process based on the activation of the glass surface by a deposit of sulphur is described. The sulphur coating picks up the luminescent powder in a uniform layer when it is brought into contact with the powder. After being removed by means of a moderate heat treatment, it leaves the screen firmly adhering to the glass surface. Possible mechanisms for the process are briefly discussed.

Investigation of Microstructure and Property of Fe3Al/Al2O3 Composites

2010 ◽  
Vol 150-151 ◽  
pp. 1409-1412 ◽  
Author(s):  
Tao Jiang
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Mechanical Alloying ◽  
Sintering Process ◽  
Composite Powders ◽  
Al2o3 Composite ◽  
Al2o3 Phase ◽  
The Mean ◽  
Xrd Patterns ◽  
Al2o3 Matrix

The Fe3Al/Al2O3 composites were fabricated by pressureless sintering process. The Fe3Al intermetallics compounds powders were fabricated by mechanical alloying and heat treatment, then the Fe3Al powders and Al2O3 powders were mixed and the Fe3Al/Al2O3 composite powders were prepared, so the Fe3Al/Al2O3 composites were fabricated by sintering process at 1700oC for 2h. The phase composition and microstructure of Fe3Al intermetallics compounds powders produced by mechanical alloying and heat treatment were investigated. The phase composition, microstructure and mechanical properties of the Fe3Al/Al2O3 composites sintered bulks were investigated. The XRD patterns results showed that there existed Fe3Al phase and Al2O3 phase in the sintered composites. The Fe3Al/Al2O3 composites sintered bulks exhibited the homogenous and compact microstructure, the Fe3Al particles were homogenously distributed in the Al2O3 matrix, the mean particles size of Fe3Al intermetallics was about 3-5μm. The Fe3Al/Al2O3 composites exhibited more homogenous and compact microstructure with the increase of Fe3Al content in the Al2O3 matrix. The density and relative density of the Fe3Al/Al2O3 composites increased gradually with the increase of Fe3Al content. The fracture strength and fracture toughness of the Fe3Al/Al2O3 composites increased gradually with the increase of Fe3Al content. The elastic modulus and hardness (HRA) of the Fe3Al/Al2O3 composites decreased gradually with the increase of Fe3Al content.

Electrokinetics, Adsorption and Colloid Study of Simulated Nuclear Waste Glasses Leached in Aqueous Solutions

1984 ◽  
Vol 44 ◽  
Author(s):  
Cheng T. Lee ◽  
D. E. Clark
Keyword(s):  
Surface Layer ◽  
Nuclear Waste ◽  
Glass Surface ◽  
Charged Particles ◽  
Electrostatic Repulsion ◽  
Surface Layers ◽  
Short Term ◽  
Chloride Solutions ◽  
Zeta Potentials ◽  
Glass Surfaces

AbstractZeta potentials of SRL-131-29.8% TOS simulated nuclear waste glasses leached in D.I. water, Al, Ca, Mg, and Zn chloride solutions at 90°C were measured as a function of leaching time. For short term leaching, the adsorption of Ca, Mg, Zn and Al reverses the glass surface potential from negative to positive. Colloids were found to be stable in D.I. water and AICl3 solutions after leaching, presumably due to the electrostatic repulsion between the glass surface and similarly charged particles. Colloids were not found in Mg, Zn or Ca chloride solutions after leaching; instead, a relatively thick metasilicate surface layer was formed on glass surfaces leached in these solutions. The concentration of Si in solution is reduced by the formation of these surface layers.

CONCLUSION While cleaned silica-based glass surfaces have similar surface compositions, their susceptibility to strongly adsorbing organic contaminant s depends strongly on the glass composition and the cleaning procedure. For the three glass species exam-ined: silica, aluminoborosilicate, and sodalime glass , the glass surfaces behave similarly after chromic acid cleaning. They show significant differences in their properties followin g a dry cleaning procedure, such as pyrolysis or UV/ozone cleaning. The cleaned silica surfaces show a high susceptibility to adsorbing or-ganic contamination following pyrolysis cleaning, while the pyrolyzed sodalime glass appears to be virtually immune to strongly adsorbing organic molecules. Py-rolyzed aluminoborosilicate glass shows an intermediate susceptibility to adsorb-ing organic contaminants. The chromic acid cleaned glass surfaces all show an in-termediate susceptibility to contamination by adsorbed organic molecules. Thus, it may be an oversimplification to consider a clean glass surface as a high energy substrate that is bound to attract ambient organic contamination. The wettability behavior of the cleaned glass surfaces showed features associ-ated with their exposed chemical functions. The non-dispersive interaction energy between glass and water as a function of pH showed evidence of charging of the surface silanol groups. The point of zero charge for these surface chemical func-tions was observed at pH 3. An estimate of the non-dispersive interaction energy between glass and water at the point of zero charge enables a reasonable estima-tion of the density of surface silanol groups on the cleaned glass. The trends ob-served for the surface charge as a function of pH correlate with the observed sus-ceptibility for adsorbing organic contamination to the cleaned glass surfaces. Charge-adsorbed surfactant monolayers indicated a negative surface charge on the cleaned glass, as expected for silica-based glass surfaces at neutral pH. The wettability of grafted self-assembled octadecylsilane monolayers indicated high quality coatings on the cleaned glass surfaces. The coating quality was identical for all three glass species following chromic acid cleaning. The UV/ozone cleaned glass surfaces showed the highest coating quality on the silica surface, followed by the aluminoborosilicate surface and the sodalime glass surface. The trends in coating quality for all chromic acid cleaned surfaces and UV/ozone cleaned surfaces correlate with those seen for susceptibility to organic contamina-tion of the cleaned glass surfaces exposed to unpurified liquid octane. REFERENCES

2003 ◽  
pp. 114-116
Keyword(s):  
Glass Surface ◽  
Chromic Acid ◽  
Point Of Zero Charge ◽  
Coating Quality ◽  
Organic Contamination ◽  
Cleaning Procedure ◽  
Silanol Groups ◽  
Acid Cleaning ◽  
Glass Surfaces ◽  
Uv Ozone

scholarly journals Designing a Quick Fix Shutter for Auto-Disinfecting Scan Glass Surface in Biometric Scanners

2020 ◽  
Author(s):  
Deepalekshmi Ponnamma ◽  
Mohammad Talal Houkan ◽  
Muni Raj Mourya ◽  
Noora Al-Thani
Keyword(s):  
Infectious Disease ◽  
Heat Treatment ◽  
Glass Surface ◽  
Universal Design ◽  
Professional Life ◽  
Cross Contamination ◽  
Finger Print ◽  
Potential Sources ◽  
Single Use ◽  
Short Time

Fingerprint scanners are significant devices in professional life, and its contamination can be potential sources of COVID-19 transmission. Manual disinfection of the fingerprint scanner after every single use is time consuming and even can adversely affect its electronics/functioning. Thus, with an aim to prevent the spread of infectious disease by cross contamination and implement the safe use of fingerprint scanner, we have developed a smart quick fix technology for automatic disinfection of finger print scanner glass after every single use. The smart portable top mount assembly uses two different disinfecting methods that ensures higher degree of disinfection. The disinfection is based on the simultaneous ultraviolet (UV) and heat treatment for a specific short time, and required to kill all the viruses on the scan glass surface. Moreover, developing this disinfecting technology with a universal design that can be fitted to any finger print scanner irrespective to its size makes it a novel idea.

Effect of microtubule-destroying drugs on the spreading and shape of cultured epithelial cells

1985 ◽  
Vol 74 (1) ◽  
pp. 267-282
Author(s):  
L.V. Domnina ◽  
J.A. Rovensky ◽  
J.M. Vasiliev ◽  
I.M. Gelfand
Keyword(s):  
Glass Surface ◽  
Cell Shape ◽  
Medium Effects ◽  
Adhesive Surface ◽  
Lipid Films ◽  
Cultured Epithelial Cells ◽  
The Media ◽  
Glass Surfaces ◽  
Cytoplasmic Processes

The role of microtubules in the spreading of cells from the liver-derived IAR2 rat cell line was studied. Cells in the control medium seeded on a flat isotropic glass surface rapidly spread to form discoid shapes. Spreading in colcemid-containing medium was disorganized and delayed; partial reversal of spreading was observed. Nevertheless, even in the presence of colcemid the cells finally spread to discoid flattened shapes. IAR2 cells in medium without colcemid spread not to discoid but to elongated shapes under three different sets of conditions: (1) when the cells were forced to spread on narrow strips of adhesive glass surface between two non-adhesive lipid films; (2) when the cells spread on the poorly adhesive surface of poly(HEMA)-covered glass; (3) when the cells spread on the usual glass surfaces in medium containing cytochalasin D. Addition of colcemid to the media reversed the polarized spreading under the first two conditions; colcemid did not reverse the formation of the elongated cell shape acquired by the cells spreading in cytochalasin-containing medium. Effects of microtubule-destroying drugs on the spreading of epithelial and fibroblast cells are compared and discussed. It is suggested that microtubules are essential for the stabilization of the spread state of those attached cytoplasmic processes and lamellae that do not have numerous and stable-cell substratum contacts, e.g. the processes formed at the early stages of spreading or the elongated processes of polarized cells. Possibly, microtubules stabilize the non-contracted state of the actin cytoskeleton in these processes.

Glass surface evolution following gas adsorption and particle deposition from indoor cooking events as probed by microspectroscopic analysis

2020 ◽  
Vol 22 (8) ◽  
pp. 1698-1709 ◽  
Author(s):  
Victor W. Or ◽  
Michael Wade ◽  
Sameer Patel ◽  
Michael R. Alves ◽  
Deborah Kim ◽  
...  
Keyword(s):  
Glass Surface ◽  
Particle Deposition ◽  
Gas Adsorption ◽  
Emission Sources ◽  
Surface Evolution ◽  
Glass Surfaces

Microspectroscopic analyses of glass surfaces following a single day of cooking events reveal organic depositions that can be traced back to emission sources and airborne distributions.

Chemical reaction between lead-free multicomponent alkali borosilicate glass frit and hematite during heat treatment

2021 ◽  
Vol 41 (1) ◽  
pp. 823-830
Author(s):  
Hideki Hashimoto ◽  
Akane Terasawa ◽  
Hirofumi Inada ◽  
Taigo Takaishi ◽  
Tatsuo Fujii ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Chemical Reaction ◽  
Borosilicate Glass ◽  
Glass Frit ◽  
Lead Free

Laser Sub-Micron Patterning of Rough Surfaces by Micro-Particle Lens Arrays

2011 ◽  
Vol 1 (3) ◽  
pp. 1-9 ◽  
Author(s):  
Ashfaq Khan ◽  
Zengbo Wang ◽  
Mohammad A Sheikh ◽  
Lin Li
Keyword(s):  
Rough Surface ◽  
Self Assembly ◽  
Glass Surface ◽  
Rough Surfaces ◽  
Flat Glass ◽  
Surface Patterning ◽  
Laser Surface ◽  
New Method ◽  
Experimental Investigations ◽  
Sio2 Spheres

Laser surface patterning by Contact Particles Lens Arrays (CPLA) has been widely utilized for patterning of smooth surfaces but there is no technique developed by which CPLA can be deposited on a rough surface. For deposition of CPLA, conventional techniques require the surface to be flat, smooth and hydrophilic. In this study, a new method for the deposition of CPLA on a rough surface is proposed and utilized for patterning. In this method, a hexagonal closed pack monolayer of SiO2 spheres was first formed by self-assembly on a flat glass surface. The formed monolayer of particles was picked up by a flexible sticky surface and then placed on the rough surface to be patterned. A Nd:YVO4 laser was used to irradiate the substrate with the laser passing through the sticky plastic and the particles. Experimental investigations have been carried out to determine the properties of the patterns.

Thin-Film Encapsulants for Thermal Processing of GaAs

1988 ◽  
Vol 144 ◽  
Author(s):  
J.M. Molarius ◽  
E. Kolawa ◽  
K. Morishitaal ◽  
E.T-S. Pan ◽  
J.L. Tandon ◽  
...  
Keyword(s):  
Thin Film ◽  
Heat Treatment ◽  
Chemical Reaction ◽  
Thermal Processing ◽  
Hillock Formation

ABSTRACTDuring heat treatment of GaAs there is a tendency for arsenic to evaporate. This process can have deleterious consequences and must be controlled during the annealing of GaAs by using encapsulants. In this work we use a Cr collector to catch the evaporated atoms. This collector is placed on top of GaAs or GaAs/cap during annealing. We survey the effectiveness of W, Hf and HfN as capping materials for thermal annealings of 10 min. for 450–700 C and compare them to Si3N4. The backscattering spectrometry results show that Si3N4 and W were excellent caps up to 700 C for 10 min. No evaporation was defected through HfN either, but hillock formation was detected on the surface. Hf failed because of its chemical reaction with GaAs at 650 C, 10 min.

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