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Gilev, V. G.

doi:10.1023/a:1012383211463

Cited by 16 publications

(4 citation statements)

References 5 publications

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“…This observation is consistent with the measurements of p f (Figure 3d). AlN fillers are responsible for one strong and broad band, which peaked around 720 cm -1 , according to with data [23]. The peak at this wavelength widens and enlarges in polymer composites as the filler content increases.…”

Section: Ftir-atr Spectrasupporting

confidence: 65%

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Influence of the Addition of Sialon and Aluminum Nitride Fillers on the Photocuring Process of Polymer Coatings

et al. 2022

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This article presents the results of a study on polymer coatings containing poly ethoxylated bisphenol A diacrylate (Bis-AEA10) with aluminum silicon nitride oxide (Sialon) and aluminum nitride (AlN). The polymer coatings were obtained by the photopolymerization technique. Investigations were carried out to determine the effect of the AlN and Sialon content on the UV-curing kinetics, as well as on the mechanical (hardness), thermal (Tg, thermal stability), physicochemical (water contact angle), and structural properties of the polymer coatings. Polymerization rates were characterized as functions of double-bond conversion using the photo-Differential Scanning Calorymetry technique (photo-DSC). The results obtained showed that a small addition of sialon filler (3–5 wt.%) to Bis-AEA10 increases the photopolymerization rate of the varnish, while the addition of more Sialon decreases the rate of photopolymerization. However, for the systems containing AlN filler, the maximum polymerization rate was observed for samples containing 10 wt.% filler. In the case of a varnish composition containing AlN, the maximum polymerization rate is characterized by the system containing 10 wt.% of AlN. This shows that the AlN filler has a good influence on the polymerization process. In either case, the final double bond conversion was high (80%–95%). Mechanical tests have shown that introducing the filler into the polymer matrix increases its hardness. The content of Sialon and AlN in the coatings causes an increase (up to 4–5 wt.%) and a decrease (>4–5 wt.%) in the glass transition temperature. The effect of the addition of fillers on the physicochemical properties of the coating surface has also been investigated and characterized by the water contact angle method. The addition of 20 wt.% Sialon and AlN increased the contact angle of the samples by approximately 40% and 31%, respectively, resulting in coatings with hydrophobic surface properties.

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Section: Ftir-atr Spectrasupporting

confidence: 65%

“…There are no displacements of the absorption peaks are observed, which confirms that the possible interactions of fillers with the polymer are fairly small. which peaked around 720 cm -1 , according to with data [23]. The peak at this wavelength widens and enlarges in polymer composites as the filler content increases.…”

Section: Ftir-atr Spectrasupporting

confidence: 63%

Influence of the Addition of Sialon and Aluminum Nitride Fillers on the Photocuring Process of Polymer Coatings

et al. 2022

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“…The bands from 700 to 1200 cm –1 are attributed to the SiO stretching vibration, overlapping with that of the SiN stretching vibration (1045 cm –1 , 853 cm –1 ) of [Si(O,N) 4 ]-tetrahedra. Absorption peaks at 660, 540, 468, 460, and 420 cm –1 are ascribed to the AlN, SiO, SiO, SiN, and SiN bonds, respectively. , The vibration band at around 600–630 cm –1 is attributed to the AlO bond. As we can see, the absorption intensity of AlO increases, whereas SiN decreases as the x value increases, indicating a partial replacement of the SiN bond by the AlO bond in the material.…”

Section: Resultsmentioning

confidence: 99%

Blue-Emitting Sr₃Si_8–xAl_xO_7+xN_8–x:Eu²⁺ Discovered by a Single-Particle-Diagnosis Approach: Crystal Structure, Luminescence, Scale-Up Synthesis, and Its Abnormal Thermal Quenching Behavior

Wang

Takeda

et al. 2015

Chem. Mater.

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The single-particle-diagnosis approach allows for the fast discovery of novel luminescent materials using powdered samples. This paper reports a new blue-emitting Sr 3 Si 8−x Al x O 7+x N 8−x :Eu 2+ phosphor for solid state lighting and its scale-up synthesis. The structure-, composition-, and temperature-dependent luminescence were investigated and discussed by means of various analytic techniques including single-crystal XRD diffractometer, single-particle fluorescence spectroscopy, FTIR spectra, decay time, low-temperature luminescence, and computed energy level scheme. Sr 3 Si 8−x Al x O 7+x N 8−x crystallizes in the monoclinic system (space group C2/c, no. 15) with a = 18.1828 ( 13) Å, b = 4.9721 (4) Å, c = 15.9557 (12) Å, β = 115.994 (10) ο , and Z = 2. The Sr atoms are coordinated to 8 and 6 O/N atoms and located in the voids along [010] formed by vertex-sharing (Si,Al)-(O,N) 4 tetrahedra. Phase-pure powder samples of Sr 3 Si 8−x Alx O 7+x N 8−x :Eu 2+ were synthesized from the chemical composition of the single particle by controlling the x value. Luminescence of both a single particle and powders show a broad Eu 2+ emission band centered at ∼465 nm and a fwhm of ∼70 nm, under the UV light irradiation. The title phosphor has a band gap of 5.39 eV determined from the UV−vis spectrum, absorption efficiency of 83%, internal quantum efficiency of 44.9%, and external quantum efficiency of 37.4% under the 355 nm excitation. An abnormal thermal quenching behavior is observed in Sr 3 Si 8−x Al x O 7+x N 8−x :Eu 2+ that has a high activation energy for thermal quenching (0.294 eV) but a low thermal quenching temperature (∼370 K), which is ascribed to the partial overlap between the Eu 2+ excited energy level and the conduction band of the host.

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“…β-sialon is the main phase of carbothermal reduction and nitridation (CRN) process which has been reported in several papers [12][13][14][15][16][17]. Due to gas emission during the CRN process, preparation of dense body is not possible by this method [2].…”

Section: Introductionmentioning

confidence: 99%

Combination of Mechanical Activation and Silicothermal Reduction and Nitridation Process to Form X-Sialon by Using Andalusite Precursor

Jamshidi

Nourbakhsh

Jafari

et al. 2012

Molecular Crystals and Liquid Crystals

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X-sialon formation by the combination of mechanical activation and silicothermal reduction and nitridation (SRN) process was investigated. The starting materials (andalusite, Si and alumina) were activated in a planetary mill and two kinds of milling cups and balls were utilized. Samples were characterized by XRD, SEM and DSC. Milling with steel equipment inhibited nitridation. This could be related to the formation ofFeSi. Sialon formation proceeded when the milling was performed with a Teflon cup and alumina.

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Cited by 16 publications

References 5 publications

Influence of the Addition of Sialon and Aluminum Nitride Fillers on the Photocuring Process of Polymer Coatings

Influence of the Addition of Sialon and Aluminum Nitride Fillers on the Photocuring Process of Polymer Coatings

Blue-Emitting Sr₃Si_8–xAl_xO_7+xN_8–x:Eu²⁺ Discovered by a Single-Particle-Diagnosis Approach: Crystal Structure, Luminescence, Scale-Up Synthesis, and Its Abnormal Thermal Quenching Behavior

Combination of Mechanical Activation and Silicothermal Reduction and Nitridation Process to Form X-Sialon by Using Andalusite Precursor

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Untitled

Cited by 16 publications

References 5 publications

Influence of the Addition of Sialon and Aluminum Nitride Fillers on the Photocuring Process of Polymer Coatings

Influence of the Addition of Sialon and Aluminum Nitride Fillers on the Photocuring Process of Polymer Coatings

Blue-Emitting Sr3Si8–xAlxO7+xN8–x:Eu2+ Discovered by a Single-Particle-Diagnosis Approach: Crystal Structure, Luminescence, Scale-Up Synthesis, and Its Abnormal Thermal Quenching Behavior

Combination of Mechanical Activation and Silicothermal Reduction and Nitridation Process to Form X-Sialon by Using Andalusite Precursor

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Blue-Emitting Sr₃Si_8–xAl_xO_7+xN_8–x:Eu²⁺ Discovered by a Single-Particle-Diagnosis Approach: Crystal Structure, Luminescence, Scale-Up Synthesis, and Its Abnormal Thermal Quenching Behavior