A Model for Triboluminescence from Fracture Surfaces of Silica Glass

A redesigned specimen holder and cap have made possible the freeze-etching of both fracture surfaces of a frozen fractured specimen. In principal, the procedure involves freezing a specimen between two specimen holders (as shown in A, Fig. 1, and the left side of Fig. 2). The aluminum specimen holders and brass cap are constructed so that the upper specimen holder can be forced loose, turned over, and pressed down firmly against the specimen stage to a position represented by B, Fig. 1, and the right side of Fig. 2.

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Locating Al in the DABCO catalyst before and after Al extraction

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100174461 ◽

1990 ◽

Vol 48 (4) ◽

pp. 265-267

Author(s):

Kathleen B. Reuter

Keyword(s):

Active Site ◽

Inverse Relationship ◽

Transverse Direction ◽

Reaction Rate ◽

Acid Phosphate ◽

Fracture Surfaces ◽

Al Content ◽

Before And After ◽

Relationship Of

The reaction rate and efficiency of piperazine to 1,4-diazabicyclo-octane (DABCO) depends on the Si/Al ratio of the MFI topology catalysts. The Al was shown to be the active site, however, in the Si/Al range of 30-200 the reaction rate increases as the Si/Al ratio increases. The objective of this work was to determine the location and concentration of Al to explain this inverse relationship of Al content with reaction rate.Two silicalite catalysts in the form of 1/16 inch SiO2/Al2O3 bonded extrudates were examined: catalyst A with a Si/Al of 83; and catalyst B, the acid/phosphate Al extracted form of catalyst A, with a Si/Al of 175. Five extrudates from each catalyst were fractured in the transverse direction and particles were obtained from the fracture surfaces near the center of the extrudate diameter. Particles were also obtained from the outside surfaces of five extrudates.

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Crack propagation in disordered materials: how to decipher fracture surfaces

Annales de Physique ◽

10.1051/anphys:2008044 ◽

2007 ◽

Vol 32 (1) ◽

pp. 1-120 ◽

Cited By ~ 20

Author(s):

L. Ponson

Keyword(s):

Crack Propagation ◽

Disordered Materials ◽

Fracture Surfaces

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Ablation Process of Silica Glass Induced by Laser Plasma Soft X-ray Irradiation

IEEJ Transactions on Electronics Information and Systems ◽

10.1541/ieejeiss.129.595 ◽

2009 ◽

Vol 129 (4) ◽

pp. 595-600

Author(s):

Tetsuya Makimura ◽

Takashige Fujimori ◽

Shuichi Torii ◽

Hiroyuki Niino ◽

Kouichi Murakami

Keyword(s):

Laser Plasma ◽

Silica Glass ◽

Ablation Process ◽

X Ray

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Characterization of sol-gel silica glass and its composites through study of physical and chemical properties of entrapped molecules

10.31274/rtd-180813-12127 ◽

2001 ◽

Author(s):

Jovica Dimitrije Badjić

Keyword(s):

Silica Glass ◽

Sol Gel ◽

Chemical Properties ◽

Physical And Chemical Properties ◽

Physical And Chemical ◽

And Chemical Properties

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Radiotechnical hot pressed glass fiber plastics for ship aerial fairings and antennas protection in radio connection and radio location systems

Voprosy Materialovedeniya ◽

10.22349/1994-6716-2018-93-1-143-158 ◽

2019 ◽

pp. 143-158

Author(s):

V. E. Bakhareva ◽

I. V. Nikitina ◽

A. A. Churikova

Keyword(s):

Glass Fiber ◽

Silica Glass ◽

High Strength ◽

Scientific Problem ◽

Epoxy Amine ◽

Dielectric Glass ◽

Radio Location ◽

Location Systems

The article is devoted to the urgent scientific problem of creation and introduction in shipbuilding of high-strength, water-resistant dielectric glass-reinforced hot pressed plastics on the basis of bi- and polyfunctional epoxy-amine binders and glass fabrics from alkali, quartz and silica glass.

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