Crack Branching in Soda-Lime Glass: Optical Measurement of Precursors Using Digital Gradient Sensing

Digital gradient sensing (DGS) is a non-contact and full-field optical measurement technique, which assesses mechanical behaviors of transparent materials or specular structures by measuring angular deflections of light rays. However, owing to the poor light-gathering capability of its imaging system, the dynamic performance of DGS is heavily restricted. Here, a method of enhancing the dynamic performance of DGS by improving its speckle target is proposed. The method employs the technique of backlight illumination, which significantly increases the utilization efficiency of light, shortens the exposure time, and enhances the dynamic performance of DGS. Additionally, it also uses the optimized digital speckle pattern to improve the measurement precision and accuracy. For validation, a comparison experiment was conducted, proving that the proposed method can improve the utilization efficiency of light by about 80 times and improve the quality of the speckle images by about 40%. Real tests, including a uniaxial tension test using transmission-mode DGS (t-DGS) and a three-point bending test using reflection-mode DGS (r-DGS), were also carried out, showing the efficacy and high compatibility of the proposed backlight digital speckle target. In summary, this simple method greatly improves the performance of DGS, which can be used as a standard method in both t-DGS and r-DGS.

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Highly efficient biocide silver-doped soda lime glass for application in water quality optical sensors

International Journal of Materials Research (formerly Zeitschrift fuer Metallkunde) ◽

10.3139/146.111948 ◽

2020 ◽

Vol 111 (10) ◽

pp. 857-862

Author(s):

Branimir Bajac ◽

Jovana Stanojev ◽

Slobodan Birgermajer ◽

Milena Radojevic ◽

Jovan Matovic

Keyword(s):

Water Quality ◽

Optical Sensors ◽

Soda Lime ◽

Soda Lime Glass ◽

Highly Efficient

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Microfabrication and Surface Functionalization of Soda Lime Glass through Direct Laser Interference Patterning

Nanomaterials ◽

10.3390/nano11010129 ◽

2021 ◽

Vol 11 (1) ◽

pp. 129

Author(s):

Marcos Soldera ◽

Sabri Alamri ◽

Paul Alexander Sürmann ◽

Tim Kunze ◽

Andrés Fabián Lasagni

Keyword(s):

Laser Radiation ◽

Surface Functionalization ◽

Incident Light ◽

Chemical Properties ◽

Visible Spectrum ◽

Soda Lime ◽

Soda Lime Glass ◽

Textured Surfaces ◽

Aspect Ratios ◽

Direct Laser

All-purpose glasses are common in many established and emerging industries, such as microelectronics, photovoltaics, optical components, and biomedical devices due to their outstanding combination of mechanical, optical, thermal, and chemical properties. Surface functionalization through nano/micropatterning can further enhance glasses’ surface properties, expanding their applicability into new fields. Although laser structuring methods have been successfully employed on many absorbing materials, the processability of transparent materials with visible laser radiation has not been intensively studied, especially for producing structures smaller than 10 µm. Here, interference-based optical setups are used to directly pattern soda lime substrates through non-lineal absorption with ps-pulsed laser radiation in the visible spectrum. Line- and dot-like patterns are fabricated with spatial periods between 2.3 and 9.0 µm and aspect ratios up to 0.29. Furthermore, laser-induced periodic surface structures (LIPSS) with a feature size of approximately 300 nm are visible within these microstructures. The textured surfaces show significantly modified properties. Namely, the treated surfaces have an increased hydrophilic behavior, even reaching a super-hydrophilic state for some cases. In addition, the micropatterns act as relief diffraction gratings, which split incident light into diffraction modes. The process parameters were optimized to produce high-quality textures with super-hydrophilic properties and diffraction efficiencies above 30%.

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Thermophysical Properties of Cement Mortar Containing Waste Glass Powder

Crystals ◽

10.3390/cryst11050488 ◽

2021 ◽

Vol 11 (5) ◽

pp. 488

Author(s):

Oumaima Nasry ◽

Abderrahim Samaouali ◽

Sara Belarouf ◽

Abdelkrim Moufakkir ◽

Hanane Sghiouri El Idrissi ◽

...

Keyword(s):

Thermal Conductivity ◽

Specific Heat ◽

Thermophysical Properties ◽

Glass Powder ◽

Cement Mortar ◽

Soda Lime ◽

Waste Glass ◽

Soda Lime Glass ◽

Volumetric Specific Heat ◽

Waste Glass Powder

This study aims to provide a thermophysical characterization of a new economical and green mortar. This material is characterized by partially replacing the cement with recycled soda lime glass. The cement was partially substituted (10, 20, 30, 40, 50 and 60% in weight) by glass powder with a water/cement ratio of 0.4. The glass powder and four of the seven samples were analyzed using a scanning electron microscope (SEM). The thermophysical properties, such as thermal conductivity and volumetric specific heat, were experimentally measured in both dry and wet (water saturated) states. These properties were determined as a function of the glass powder percentage by using a CT-Meter at different temperatures (20 °C, 30 °C, 40 °C and 50 °C) in a temperature-controlled box. The results show that the thermophysical parameters decreased linearly when 60% glass powder was added to cement mortar: 37% for thermal conductivity, 18% for volumetric specific heat and 22% for thermal diffusivity. The density of the mortar also decreased by about 11% in dry state and 5% in wet state. The use of waste glass powder as a cement replacement affects the thermophysical properties of cement mortar due to its porosity as compared with the control mortar. The results indicate that thermal conductivity and volumetric specific heat increases with temperature increase and/or the substitution rate decrease. Therefore, the addition of waste glass powder can significantly affect the thermophysical properties of ordinary cement mortar.

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