Infrared (IR) investigation of the structural changes of silica glasses with fictive temperature

Tomozawa, M.; Hong, Jin-Woong; Ryu, S.-R.

doi:10.1016/j.jnoncrysol.2005.01.017

Cited by 91 publications

(86 citation statements)

References 15 publications

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“…Interestingly, when the glassy sample is ball-milled, this peak is shifted to higher wave numbers (980 cm -1 after 4 h in a ZrO 2 vial set) thus converging to the value found for crystalline spodumene. For vitreous SiO 2 , a direct correlation between the maximum of the SiO stretching vibration peak and the so-called fictive temperature [66], at which the structure is frozen, was shown [52,53]. Here, a larger Si-OSi bond angle is associated with a decrease of the fictive temperature.…”

Section: Al Mas Nmr and Ir Spectroscopymentioning

confidence: 77%

“…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%

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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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Section: Al Mas Nmr and Ir Spectroscopymentioning

confidence: 77%

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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“…Amorphous silica and crystalline silica can really only be distinguished on the basis of measurements in the far-IR region. Vibrational spectra of silica glasses have been studied (Philips, 1987;Tomozawa et al 2005) and IR spectroscopy used to monitor changes in amorphous SiO 2 during its heating up to 1150°C (Chmel et al 1990). Innocenzi (2003) used IR spectroscopy to investigate different stages during the sol-gel formation of silica.…”

Section: Resultsmentioning

confidence: 99%

Precipitation of amorphous SiO2 particles and their properties

Musić

Filipović-Vinceković

Sekovanić

2011

Braz. J. Chem. Eng.

542

231

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-The experimental conditions were optimized for the synthesis of amorphous SiO 2 particles by the reaction of neutralization of sodium silicate solution with H 2 SO 4 solution. Amorphous SiO 2 particles were characterized by XRD, FT-IR, FE-SEM, EDS and microelectrophoresis. The amorphous peak was located at 2θ = 21.8 o in the XRD pattern. Primary SiO 2 particles were ~ 15 to ~ 30 nm in size and they aggregated into bigger particles. Amorphous SiO 2 particles showed a specific surface area up to 130 m 2 g -1, dependent on the parameters of the precipitation process. The EDS spectrum of amorphous SiO 2 particles did not show contamination with sulfate or other ions, which cannot be excluded in traces. pH zpc =1.7 was obtained by microelectrophoresis.

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“…The Si-O bands consist of an antisymmetric stretch (cleaved by longitudinal optical mode-(LO) transversal optical mode (TO) splitting into a doublet at 1050-1200 cm −1 ), asymmetric stretch at 800 cm −1 , and a rocking mode at 450 cm −1 (Figure not shown). [24,25] Compared with the FTIR spectrum of the freshly prepared PSi, both Si-H x stretching and deformation modes completely disappeared after surface oxidation. Intense Si-OH stretching and bending modes appeared at 3446 and 1630 cm −1 , respectively.…”

Section: Grafting Of Aniline To Psi Siliconmentioning

confidence: 99%

Chemical and electrochemical grafting of polyaniline on aniline‐terminated porous silicon

Chiboub

Boukherroub

Szunerits

et al. 2010

Surface & Interface Analysis

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IntroductionSurface modification of materials with functional polymers is an important research area in polymer science because of the wide applications of polymers in various fields including adhesion, biomaterials, protective coatings, friction and wear, composites, microelectronics and thin-film technology. [1 -3] In recent years, a great deal of research is focused on synthesis of polymer films by various means for potential applications such as components in molecular electronics, [4] optical devices, [5] etch resists, [6] biosensors, [7] and as scaffolds for tissue engineering and fundamental studies in cell biology. [8] Among the available polymers, conducting polymers show much promise in electronics and sensing applications because of their distinguishable electrical properties, mechanical flexibility and relative ease of processing. [9 -11] Polyaniline (PANI) has been extensively studied in different fields of science [12] because of exigent demands for highperformance materials in advanced technologies including active electrodes, [13] microelectronic materials, electrochemical devices, [14] rechargeable batteries, [15] energy storage and transfer, redox miocrotemplates, [16] sensors [17] and actuators. [18] While porous silicon (PSi) displays excellent bulk physical and chemical properties, it does not possess suitable surface properties required for specific applications. Freshly prepared PSi is hydrogen terminated and exhibits good optical and electronic properties. However, the hydrogen-terminated PSi surface (Si-H x termination) is very reactive upon exposure to ambient air, and thus, does not fully protect the optical and electronic properties of the material. For this reason, surface-modification techniques can transform this material into valuable finished products. [19 -23] In this paper, we report on the covalent modification of PSi substrates with PANi films using chemical or electrochemical strategies. The resulting PANi/PSi hybrid interfaces showed a high chemical stability and good electrical properties. The chemical composition of the resulting hybrid structure was characterized by Fourier transform infrared spectroscopy (FTIR), XPS and SIMS, while the morphology of the substrates was studied using SEM. Experimental Section MaterialsSilicon wafers were purchased from Siltronics. All cleaning and etching reagents were clean room grade. Sulfuric acid (H 2 SO 4 ) 96%, hydrogen peroxide (H 2 O 2 ) 30% and hydrofluoric acid (HF) 50% were supplied by Amplex. All other chemicals were reagent grade or higher, and were used as received unless otherwise specified. Milli-Q water (18 M ) was used for all experiments. * Correspondence to: Nawel Chiboub, UDTS, 02, Bd. Frantz Fanon, B. P. 140 Alger Preparation of PSi substratesDouble-side polished Si(100)-oriented p-type silicon wafers (boron-doped, 5-10 -cm resistivity) were first cleaned in 3 : 1 concentrated H 2 SO 4 /30% H 2 O 2 for 20 min at 80• C and then sonicated in Milli-Q water for 10 min. The clean wafers were immersed in 50% HF aq...

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Infrared (IR) investigation of the structural changes of silica glasses with fictive temperature

Cited by 91 publications

References 15 publications

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

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

Precipitation of amorphous SiO2 particles and their properties

Chemical and electrochemical grafting of polyaniline on aniline‐terminated porous silicon

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Infrared (IR) investigation of the structural changes of silica glasses with fictive temperature

Cited by 91 publications

References 15 publications

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

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

Precipitation of amorphous SiO2 particles and their properties

Chemical and electrochemical grafting of polyaniline on aniline‐terminated porous silicon

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Product

Resources

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

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