A simple IR spectroscopic method for determining fictive temperature of silica glasses

Agarwal, Anand; Davis, Ken; Tomozawa, M.

doi:10.1016/0022-3093(94)00676-8

Cited by 238 publications

(182 citation statements)

References 19 publications

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“…This absorption gradually shifts to 1011 cm −1 . The absorption band due to vibration of Si-O stretching shifts to lower wavelengths with incremental densification [26]. However, this band shifts to higher wavelengths again at >550 • C. This tendency was previously reported [27].…”

Section: Infrared Absorption (Ir)mentioning

confidence: 50%

Surface Observation and Magnetism of Oil-Extracted Botryococcus braunii Residues before and after Carbonization

Wang

Demura

Watanabe

et al. 2018

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Abstract:Microalgae is a promising next-generational energy. In this research, we focus on oil-extracted Botryococcus braunii residues collected by adding polysilicato-iron (PSI) as a flocculant followed by carbonization under argon atmosphere. We conducted carbonization at various temperatures as a first attempt to reveal the fundamental properties of the carbonization process of the microbes. The carbons thus obtained by heat treatment at 900 • C present a unique magnetic behavior due to reduced magnetite (Fe 3 O 4 ) inclusion, which is produced from polysilicato iron (Fe 2 O 3 ) during the heating process. Experimental results suggest that this carbonic material can be applied as a heavy metal-capturing carbon and magnetic porous substrate catalyst. The effective use of the waste may open a new avenue for an energy-microbiology-materials system.

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Section: Infrared Absorption (Ir)mentioning

confidence: 50%

Surface Observation and Magnetism of Oil-Extracted Botryococcus braunii Residues before and after Carbonization

Wang

Demura

Watanabe

et al. 2018

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“…In both cases, Al as well as Si are tetrahedrally coordinated. Therefore, the shift of the SiO asymmetric stretching vibration might be attributed to contributions of smaller Si-O-Si bond angles in the bond angle distribution in the glass [45,51,52,53]. In crystalline -spodumene, rings of 5, 6, and 7 tetrahedra exist in the network [28].…”

Section: Al Mas Nmr and Ir Spectroscopymentioning

confidence: 99%

Li Ion Diffusion in Nanocrystalline and Nanoglassy LiAlSi₂O₆ and LiBO₂ - Structure-Dynamics Relations in Two Glass Forming Compounds

Kuhn¹,

Tobschall²,

Heitjans³

2009

Zeitschrift Für Physikalische Chemie

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In the present study the Li diffusivity in nanostructured samples of two glass forming model systems, spodumene (LiAlSi 2 O 6 ) and lithium metaborate (LiBO 2 ), was examined using 7 Li nuclear magnetic resonance (NMR) spin-lattice relaxometry and dc conductivity measurements. The nanostructured samples were prepared by high-energy ball milling of the respective crystalline starting material on the one hand and the corresponding glass on the other hand. The diffusivity of the glass exceeds that of the crystalline sample for both systems. However, when the crystalline samples are mechanically treated by ball milling the diffusivity is enhanced. Nevertheless, the diffusivity of these nanocrystalline samples remains lower than that of the corresponding glass. Surprisingly, when the glassy samples are treated in the same way the diffusivity decreases. After sufficiently long milling times the diffusivity of these nanoglassy samples approaches that of the nanocrystalline samples. This convergence effect seems to be due to structural relaxation processes as is suggested by supplementary infrared spectroscopy and 27 Al, 12B magic angle spinning NMR measurements.

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“…Glass E-II (15 wt% ZrO 2 ) and EE (15 wt% ZrSiO 4 ) show almost similar T f values, indicating that the presence of zircon or zirconia in the glass has a similar impact on T g . A 515 567 514 562 510 567 B 508 568 514 588 520 577 C 518 575 524 588 532 593 D 520 577 517 589 520 590 E 522 576 528 586 528 594 AA 478 520 472 522 468 522 E-II 511 563 503 577 504 597 EE 509 550 497 560 492 566 3.2 Using FTIR and XRD to detect crystallisation and phase separation FTIR is widely used to interpret the structural modifications which occur during heat-treatment [27][28][29]. The FTIR spectrum of amorphous silica was reported in other studies and the major peak corresponding to the asymmetric Si-O-Si stretching vibration was recorded at approximately 1100 cm -1 [28,30].…”

mentioning

confidence: 99%

Thermal behaviour of zircon/zirconia-added chemically durable borosilicate porous glass

et al. 2013

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Macroporous alkali resistant glass has been developed by making additions of zirconia (ZrO 2 ) and zircon (ZrSiO 4 ) to the sodium borosilicate glass system SiO 2 -B 2 O 3 -Na 2 O. The glass was made using a traditional high temperature fusion process. Differential thermal analysis (DTA) was carried out to identify the glass transition temperature (T g ) and crystallisation temperature (T x ). Based on these findings, controlled heattreatments were implemented to separate the glass into two-phases; a silica-rich phase, and an alkali-rich borate phase. X-ray diffraction (XRD) was used to identify any crystal phases present in the as-quenched and heat-treated glasses. Fourier transform infrared (FTIR) spectroscopy also proved effective in investigating phase separation and crystallisation behaviour. After leaching, a silica-rich skeleton with an interconnected pore structure and a uniform pore distribution was observed. Pore characterisation was carried out using mercury porosimetry. The size and shape of the pores largely depended on the heattreatment temperature and time. ZrO 2 /ZrSiO 4 additions increased the alkali resistance of the porous glass 3-4 times.

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A simple IR spectroscopic method for determining fictive temperature of silica glasses

Cited by 238 publications

References 19 publications

Surface Observation and Magnetism of Oil-Extracted Botryococcus braunii Residues before and after Carbonization

Surface Observation and Magnetism of Oil-Extracted Botryococcus braunii Residues before and after Carbonization

Li Ion Diffusion in Nanocrystalline and Nanoglassy LiAlSi₂O₆ and LiBO₂ - Structure-Dynamics Relations in Two Glass Forming Compounds

Thermal behaviour of zircon/zirconia-added chemically durable borosilicate porous glass

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A simple IR spectroscopic method for determining fictive temperature of silica glasses

Cited by 238 publications

References 19 publications

Surface Observation and Magnetism of Oil-Extracted Botryococcus braunii Residues before and after Carbonization

Surface Observation and Magnetism of Oil-Extracted Botryococcus braunii Residues before and after Carbonization

Li Ion Diffusion in Nanocrystalline and Nanoglassy LiAlSi2O6 and LiBO2 - Structure-Dynamics Relations in Two Glass Forming Compounds

Thermal behaviour of zircon/zirconia-added chemically durable borosilicate porous glass

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Product

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Li Ion Diffusion in Nanocrystalline and Nanoglassy LiAlSi₂O₆ and LiBO₂ - Structure-Dynamics Relations in Two Glass Forming Compounds