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Journal of Inorganic Materials
Contents
2019
Volume: 34 Issue 2
16 Article(s)
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Research Articles
Preparation of NiCo
2
O
4
with Various Morphologies: a Review
Yu-Chi WAN, Jing ZHAN, Jun CHEN, [in Chinese], [in Chinese], and [in Chinese]
NiCo2O4 nanomaterials exhibit great potential in the fields of energy storage and conversion especially in supercapacitors for their unique physicochemical properties. Given the important impact of morphology of nano material on its performance, this review focuses on preparation methods and application of NiCo2O4 nano
NiCo
2
O
4
nanomaterials exhibit great potential in the fields of energy storage and conversion especially in supercapacitors for their unique physicochemical properties. Given the important impact of morphology of nano material on its performance, this review focuses on preparation methods and application of NiCo
2
O
4
nanostructure with various morphologies including nanoneedle, nanowire, nanotube, nanosheet, sphere, nanoflower, coral-like structure and three-dimensional hybrid structure. Furthermore, the influence of morphology and particle size of NiCo
2
O
4
on its properties is also introduced. Finally, the future research direction of NiCo
2
O
4
nanomaterials in the fields of energy storage and conversion is prospected..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 121 (2019)
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Green Preparation and Supercapacitive Performance of NiCo
2
S
4
@ACF Heterogeneous Electrode Materials
Shi-Huai ZHAO, Zi-Bo YANG, Xiao-Ming ZHAO, Wen-Wen XU, Xin WEN, Qing-Yin ZHANG, [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Traditional NiCo2S4 vulcanization process requires high-temperature and high energy supply, and has disadvantage of low conductivity. In this study, an environmental friendly vulanization method was utilized to prepare unique NiCo2S4@ACF core-shell heterstructure materials with activated carbon fiber (ACF) as skeleton
Traditional NiCo
2
S
4
vulcanization process requires high-temperature and high energy supply, and has disadvantage of low conductivity. In this study, an environmental friendly vulanization method was utilized to prepare unique NiCo
2
S
4
@ACF core-shell heterstructure materials with activated carbon fiber (ACF) as skeleton at room temperature. NiCo
2
S
4
@ACF composite electrode material owns layered structures, which can effectively expand contact area with electrolyte, improve electron transmission path, and better create electrochemical performance. Specific capacitance of NiCo
2
S
4
@ACF composite electrode materials reached 1541.6 F/g (678 μF/cm
2
) at the current density of 1 A/g. In addition, the asymmetric supercapacitors (ASC) device fabricated with NiCo
2
S
4
@ACF as positive electrode and ACF as negative electrode exhibited energy density as high as 49.38 Wh/kg at the power density of 800 W/kg, and preeminent cycle stability up to 90.28% after 2000 cycles. All these data demonstrated that NiCo
2
S
4
@ACF is a promising potential application in the field of high-performance supercapacitors in the future..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 130 (2019)
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Photovoltaic Performance of Ag
2
Se Quantum Dots Co-sensitized Solid-state Dye-sensitized Solar Cells
Ying YANG, De-Qun PAN, Zheng ZHANG, Tian CHEN, Xiao-Min HAN, Li-Song ZHANG, Xue-Yi GUO, [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Ag2Se quantum dots (QDs) was synthesized by co-deposition method which was further applied as co-sensitizer in solid-state dye-sensitized solar cells (DSSCs). The effects of different sensitization methods of Ag2Se QDs (TiO2/N719/QDs, TiO2/QDs/N719) and sensitization time (0-5 h) on the performance of QDs/dye co-sensit
Ag
2
Se quantum dots (QDs) was synthesized by co-deposition method which was further applied as co-sensitizer in solid-state dye-sensitized solar cells (DSSCs). The effects of different sensitization methods of Ag
2
Se QDs (TiO
2
/N719/QDs, TiO
2
/QDs/N719) and sensitization time (0-5 h) on the performance of QDs/dye co-sensitized solar cells were studied. Structure and optical properties of Ag
2
Se QDs were characterized by transmission electron microscopy (TEM) and ultraviolet-visible spectroscopy (UV-Vis). Furthermore, the transmission of charge carriers of solar cell devices was characterized by photo-modulated photocurrent/voltage spectrum (IMPS/VS) and electrochemical impedance spectra (EIS). It was found that the device with TiO
2
/QDs/N719 showed higher incident photon-to-current efficiency (IPCE) and photoelectric efficiency than those of TiO
2
/N719/QDs, which was due to the fact that TiO
2
/QDs/N719 photoanode adsorbed more QDs and dyes. With the extension of Ag
2
Se QDs sensitization time, the photovoltaic properties of DSSCs firstly ascended and then descended, achieving the highest photoelectric conversion efficiency 3.97%. The incorporation of Ag
2
Se QDs could effectively promote the electron transport and inhibit the electron-hole recombination, which benefited from a blocking layer that QDs served in device. As sensitization time prolonged over 2 h, the photovoltaic performances of device deteriorated, which was attributed to the augmented trap sites in Ag
2
Se QDs layer..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 137 (2019)
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Polyaniline-carbon Pillared Graphene Composite: Preparation and Electrochemical Performance
Xi HU, Hong-Bo LIU, Xiao-Hong XIA, Zhi-Qiang GU, [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Polyaniline-carbon pillared graphene composites (PGR) were successfully prepared by vacuum extraction induced self-assembly and pyrolysis method. Effects of the mass ratio of aniline monomer (AN) and graphene oxide (GO) on structure and electrochemical properties of PGR were investigated by X-ray diffraction, transmiss
Polyaniline-carbon pillared graphene composites (PGR) were successfully prepared by vacuum extraction induced self-assembly and pyrolysis method. Effects of the mass ratio of aniline monomer (AN) and graphene oxide (GO) on structure and electrochemical properties of PGR were investigated by X-ray diffraction, transmission electron microscopy, X-ray photoelectron spectroscopy, and electrochemical characterization. Results showed that the polyaniline-carbon pillars uniformly distributed between the graphene (GR) layers to form a three-dimensional conductive network with expanded interlayer space and nitrogen doping, which effectively improved the structural stability and electrochemical performance of GR. The as-prepared PGR with the mass ratio of AN and GO at 1 : 1 exhibits a high reversible capacity of 653 mAh/g at a current density of 100 mA/g and an excellent rate capability of 343 mAh/g at a current density of 1 A/g, all that is much higher than that of the GR electrode (101 mAh/g)..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 145 (2019)
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Rice-like CuO Chemically Modified Electrode: Preparation and Detection for Glucose
Min DENG, Qi JIANG, Zhi-Hong DUAN, Qing-Qing LIU, Li JIANG, Xiao-Ying LU, [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
A novel rice-like copper oxide (CuO) was synthesized without using soft template and alkali by hydrothermal and in-situ decomposition methods. This rice-like CuO material was made into the chemically modified electrode (CME) with Nafion solution for non-enzymatic glucose sensing. Structure and morphology of the prepare
A novel rice-like copper oxide (CuO) was synthesized without using soft template and alkali by hydrothermal and
in-situ
decomposition methods. This rice-like CuO material was made into the chemically modified electrode (CME) with Nafion solution for non-enzymatic glucose sensing. Structure and morphology of the prepared material and electrode were characterized by X-ray diffraction and scanning electron microscopy. Electrochemical performances of the obtained electrodes were investigated by linear sweep voltammetry, cyclic voltammetry, amperometric response, and electrochemical impedance spectroscopy. Results show that morphology of the obtained CuO particle is similar to rice grain. And its length and diameter are between 0.5-1.0 μm and 250-320 nm, respectively. The CME with 0.35 mg rice-like CuO (with 0.22 cm
2
electrode surface area) has an obvious current response for glucose with the linear range from 0.0357 to 2.361 mmol/L, the linear equation
I
pa
(mA)= -0.00187+0.05239
c
(mmol/L) (
R
2
=0.998), the detection limit 0.0647 μmol/L, and the sensitivity 950.36 μA·L/(mmol·cm
2
). Therefore, the prepared CuO CME shows a promise selectivity and reliability for detecting glucose..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 152 (2019)
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λ/4-λ/2 Double-layer Broadband Antireflective Coatings with Superhydrophilicity and Photocatalysis
Yuan-Yang LI, Bo JIANG, [in Chinese], and [in Chinese]
Antireflective (AR) coatings, which can suppress the undesired interfacial Fresnel reflections, are widely used in optical devices and energy-related instruments. Conventional single-layer quarter-wave AR coatings, which only work at a single wavelength, have been seriously limited in some practical applications becaus
Antireflective (AR) coatings, which can suppress the undesired interfacial Fresnel reflections, are widely used in optical devices and energy-related instruments. Conventional single-layer quarter-wave AR coatings, which only work at a single wavelength, have been seriously limited in some practical applications because of this inherent property. In this work, broadband AR coatings were designed and prepared based on the concept of
λ
/4-
λ
/2 double-layer interference film by Sol-Gel dip-coating method. Substrates (K9 glasses) coated with the double-layer films attained consistent high transmittances at 500-700 nm with an average transmittance of 99.4%, and the average transmittance at visible region was 99.0%. The
λ
/4-
λ
/2 broadband antireflective coatings were achieved without low-refractive- index materials. So high-refractive-index TiO
2
could be introduced into the double-layer films to endow the films with self-cleaning property. The double-layer films exhibited outstanding superhydrophilicity with water contact angle of 2.2° in 0.5 s, and the superhydrophilicity lasted for 20 d in the absence of UV illumination. The double-layer coatings also showed a good ability to decompose organic substances under UV irradiation. The broadband of AR coatings with photocatalysis and durable superhydrophilicity may be applied in the fields of opto- and microelectronics..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 159 (2019)
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Controllable Synthesis and Photocatalytic Performance of BiVO
4
under Visible-light Irradiation
Jie LI, Chen-Fei SONG, Xian-Juan PANG, [in Chinese], [in Chinese], and [in Chinese]
Visible-light-driven photocatalyst BiVO4 was synthesized via a facile microwave-hydrothermal method using BiVO3·5H2O and NH4VO3 as raw materials. Crystal structure of BiVO4 photocatalyst could be selectively controlled to be tetragonal or monoclinic by simply adjusting the pH of the precursor solution. The prepare
Visible-light-driven photocatalyst BiVO
4
was synthesized
via
a facile microwave-hydrothermal method using BiVO
3
·5H
2
O and NH
4
VO
3
as raw materials. Crystal structure of BiVO
4
photocatalyst could be selectively controlled to be tetragonal or monoclinic by simply adjusting the pH of the precursor solution. The prepared samples were characterized by XRD, UV-Vis, Raman, and SEM. The mechanism of BiVO
4
formation with different crystal structures was discussed. Meanwhile, the photocatalytic performances of the prepared sample were evaluated by degradation of methylene blue and photocalytic oxidation of NO gas in air under visible light irradiation. The results showed that BiVO
4
(z-t) microsphere was obtained when the precursor pH is 3-5, but when the pH is less than 2 or greater than 7, the as-prepared powders are BiVO
4
(s-m) with polyhedron morphology. This may be due to the change of pH that could form transformation of vanadate and bismuth ion in the precursor solution, and then affect the formation process of BiVO
4
, resuting in the change of crystal structure, morphology, crystal surface, and VO
4
tetrahedron of BiVO
4
(s-m). The photocatalytic tests indicated that the activity of BiVO
4
(s-m) was much better than that of BiVO
4
(z-t). The BiVO
4
(s-m) sample prepared at pH 9 exhibits excellent visible-light photocatalytic activity, because of its higher crystalline, preferentially exposed facts (040), and higher degree distortion of VO
4
3-
tetrahedron..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 164 (2019)
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Pt Supported Hierarchical ZSM-5 Zeolite as Adsorbent/Catalytic Combustion Catalyst for o-xylene Elimination
Meng-Qiu CHEN, Yu WANG, Deng-Yao YANG, Hong-Juan WU, Li-Min GUO, [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Pt/hierarchical ZSM-5 zeolites were successfully synthesized by the steam-assisted crystallization and subsequent wetness impregnation method. Structural features were characterized by XRD, N2 isotherm, SEM, and TEM. Its catalytic behaviors for o-xylene storage at room temperature, and catalytic combustion of stored o-
Pt/hierarchical ZSM-5 zeolites were successfully synthesized by the steam-assisted crystallization and subsequent wetness impregnation method. Structural features were characterized by XRD, N
2
isotherm, SEM, and TEM. Its catalytic behaviors for
o
-xylene storage at room temperature, and catalytic combustion of stored
o
-xylene at elevated temperatures were evaluated. It was found that crystallinity of the product underwent a reducing tendency after introduction of mesostructure, but the mesoporosity and pore volume were remarkably increased. Compared with Pt/conventional ZSM-5 zeolite, the
o
-xylene adsorption capacity of Pt/hierarchical HZSM-5 was around 8 times as that of the counterpart without mesostructure. Moreover, the Pt dispersion was improved due to mesoporosity. The highly dispersed Pt nanoparticles were beneficial for catalytic combustion of
o
-xylene. Futhermore, Pt/hierarchical ZSM-5 showed the efficient bi-functional performance during adsorption/catalytic combustion cycling process for
o
-xylene. Carbon balance was kept for three cycles without secondary pollutants, showing higher adsorption capacity and better reusing stability..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 173 (2019)
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Acetic Acid Leaching on the Structure, Acidity and Performance of HMOR Catalyst
Hai-Bo HAN, You-He WANG, Kang LI, Jie LEI, Dan-He LIU, Zi-Feng YAN, [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Acid sites located inside the 8-ring side-pockets of mordenite are highly active for DME carbonylation. However, mordenite deactivates very fast during the reaction because of non-selective reactions happening inside the 12-ring main channels of zeolites. In the present study, HMOR was treated by acid leaching using ac
Acid sites located inside the 8-ring side-pockets of mordenite are highly active for DME carbonylation. However, mordenite deactivates very fast during the reaction because of non-selective reactions happening inside the 12-ring main channels of zeolites. In the present study, HMOR was treated by acid leaching using acetic acid of different concentration, with the purpose to selectively remove framework Al which is located inside 12-ring channels. Physicochemical characteristics of the parent and acid-treated mordenites were studied by complementary methods including: XRD,
27
Al-NMR, NH
3
-TPD, pyridine IR, and N
2
adsorption-desorption. The results show that the acid treatment, if appropriately applied, increases both the Si/Al and micropore volume of the samples, without significantly changing the mesopore size distribution. Most of the framework Al species in the 12-membered ring channels of HMOR were removed, without impacting those located inside the 8-ring channels. The catalytic results show that the initial activity of catalyst decreased slightly from 45.6% to 43.8%. On the other hand, the activity stability improved substantially, with stabilization period prolonged obviously from 18 h to 50 h..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 179 (2019)
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Synthesis of Nano Manganese Oxide with Assistance of Ultrasonic for Removal of Low Concentration NO
Yun GONG, Yan LIU, Ping GU, Yu-Fang ZHU, Xiao-Xia ZHOU, [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
The varied-valence nanocatalyst MnOx was prepared using the oxidation-reduction method under ultrasonic. The optimal synthetic conditions of MnOx were explored by adjusting the ultrasonic time, concentration of reaction precursor, drying temperature, and pH of reaction solution. The results indicated that the optimal s
The varied-valence nanocatalyst MnO
x
was prepared using the oxidation-reduction method under ultrasonic. The optimal synthetic conditions of MnO
x
were explored by adjusting the ultrasonic time, concentration of reaction precursor, drying temperature, and pH of reaction solution. The results indicated that the optimal sample MnO
x
was synthesized under the condition of ultrasonic time of 20 min, 0.5 mol/L KMnO
4
, drying temperature of 80 ℃ and pH=7, which showed the super catalytic performance and the time of 100% NO removal rate was as high as 15 h at room temperature. The structure and morphology of the optimal catalyst MnO
x
were investigated by XRD, N
2
-adsorption-desorption analysis, SEM and TEM. Besides, XPS and FT-IR were also applied to explore the catalytic oxidation process of NO removal and the deactivation mechanism of the optimal sample MnO
x
. It is believed that the interpenetrating and hierarchal pore, the petaloid morphology and weak crystallization structure contribute to the gas adsorption and transmission. The presence of varied-valence Mn and oxygen vacancy can improve the adsorption and activation of NO and O
2
, thus, enhancing the NO catalytic removal on the optimal catalyst MnO
x
at room temperature..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 186 (2019)
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Construction of Hierarchical α-MoO
3
Hollow Microspheres and Its High Adsorption Performance towards Organic Dyes
Li-Li SUI, Run WANG, Dan ZHAO, Shu-Chang SHEN, Li SUN, Ying-Ming XU, Xiao-Li CHENG, Li-Hua HUO, [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Hierarchical semiconducting metal oxide is highly active due to its special stereostructure, which is potential adsorbent for dye contaminants. Precursors of MoO2 hollow spheres were successfully synthesized via a simple and one-step solvothermal method. And hierarchical α-MoO3 hollow microspheres were obtained after s
Hierarchical semiconducting metal oxide is highly active due to its special stereostructure, which is potential adsorbent for dye contaminants. Precursors of MoO
2
hollow spheres were successfully synthesized
via
a simple and one-step solvothermal method. And hierarchical
α
-MoO
3
hollow microspheres were obtained after subsequent calcination at 400 ℃. Diameters of the
α
-MoO
3
microspheres were about 600-800 nm which were assembled by nanorods with a width of 70 nm. The as-obtained
α
-MoO
3
nanomaterials presented excellent adsorption performance for methylene blue (MB). MB removal percentage attained 73.40% in the first 5 min when the concentration of
α
-MoO
3
absorbent was 0.5 g/L in MB solution at the concentration of 20 mg/L. The equilibrium was established after adsorption for 60 min, and the removal percentages stabilized in the range of 97.53%-99.65%. Their adsorption kinetics was well fitted to a pseudo-second-order model. The adsorption isotherm conformed to Langmuir isotherm model, and the maximum uptake capacity was 1543.2 mg/g. The
α
-MoO
3
microspheres are cost-effective, fast and complete for MB removal owing to its hierarchical and hollow nanostructures, which also can be employed for adsorption of other organic dyes in waste water..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 193 (2019)
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Boron Oxide on Mechanical and Degradation Property of Calcium Polyphosphate Fibers
Xiao-Hu QIANG, Bin-Bin LI, Da-Jian HUANG, Song-Yi ZHOU, [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Calcium polyphosphate fibers (CPPF) were prepared by melt-drawing method. Effect of B2O3 with different mass fraction on degradation and mechanical properties of CPPF was studied. The obtained CPPF were characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Results show
Calcium polyphosphate fibers (CPPF) were prepared by melt-drawing method. Effect of B
2
O
3
with different mass fraction on degradation and mechanical properties of CPPF was studied. The obtained CPPF were characterized by Fourier transform infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). Results showed that tensile strength and modulus of CPPF were improved obviously with increase of mass fraction of B
2
O
3
. Moreover, the surface morphology of CPPF was influenced by the introducing of B
2
O
3
. In addition, the degradation ratio and cracks on the surface of CPPF decreased with increase of B
2
O
3
content. Tensile strength and modulus of CPPF with B
2
O
3
loading of 9% increased sharply by 146% and 153% compared to neat CPPF, respectively. After 16 d, the mass loss ratio of CPPF with B
2
O
3
loading of 9% in the degradation process is reduced by 31% compared to the neat CPPF..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 201 (2019)
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Effect of Al Powder on Property and Microstructure of Silica-based Ceramic Core
Xin LI, Shu-Xin NIU, Jian-Sheng YAO, Ding-Zhong TANG, Chun-Xiao CAO, Jun-Hao YAN, [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Silica-based ceramic core was produced by fused silica as matrix material, corundum powder as mineralizer, and Al powder as additive. Effects of aluminum powder contents on the ceramic core regarding shrinkage rate, physical performance, and microstructure were investigated. Results showed that through sintering proces
Silica-based ceramic core was produced by fused silica as matrix material, corundum powder as mineralizer, and Al powder as additive. Effects of aluminum powder contents on the ceramic core regarding shrinkage rate, physical performance, and microstructure were investigated. Results showed that through sintering process, aluminum powder was oxidized to alumina, accompanying with volume expansion and weight gain, which reduced sintering and casting shrinkages of silica-based ceramic core. There is no obvious inhibitory effect on devitrification by Al powder in the sintering process. Due to increased looseness of core skeleton structure in the casting process, the high temperature creep deformation increased. The sample with 1wt% Al showed good comprehensive properties, of which three-dimensional direction of sintering shrinkage rate were 0.01%, 0.03%, 0.03%, respectively, and porosity rate, deflection bending strength were 28.58%, 0.57 mm, 12.1 MPa, respectively. All these data demonstrated that the new core materials can meet the requirement of directional solidification and be expected to improve the dimensional accuracy of the hollow turbine blade..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 207 (2019)
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Calculation of Judd-Ofelt Parameters for Lu
2
O
3
:Er
3+
Phosphor
Chun-Feng YU, Xiang-Qing ZHANG, Jin-Su ZHANG, Xiang-Ping LI, Sai XU, Bao-Jiu CHEN, [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Optical transition properties of trivalent rare earth ions in transparent luminescent materials can be investigated via Judd-Ofelt analysis. The traditional Judd-Ofelt analysis can not be applied to nontransparent powders since its absorption spectra are unable to be measured. Therefore, in this study, a procedure for
Optical transition properties of trivalent rare earth ions in transparent luminescent materials can be investigated
via
Judd-Ofelt analysis. The traditional Judd-Ofelt analysis can not be applied to nontransparent powders since its absorption spectra are unable to be measured. Therefore, in this study, a procedure for calculating the Judd-Ofelt parameters was proposed by using defuse-reflection spectrum. Firstly, the defuse-reflection spectrum was transformed into relative absorption spectrum based on Kubelka-Munk function, and then the relative Judd- Ofelt parameters were confirmed from the relative absorption spectrum, at last the actual Judd-Ofelt parameters were obtained by using fluorescence decay data for calibrating the relative values. The method proposed for Judd-Ofelt parameters’ calculation was applied to Lu
2
O
3
:Er
3+
phosphor prepared by solid-state reaction, and the method was confirmed. The obtained Judd-Ofelt parameters were examined by comparing the radiative transition rates of
4
I
13/2
derived from the absorption cross section with which obtained from usual route by using the Judd-Ofelt parameters. The present study demonstrated that the proposed Judd-Ofelt analysis route is reliable and practical..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 213 (2019)
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Porous Bamboo Charcoal/TiO
2
Nanocomposites: Preparation and Photocatalytic Property
Qiu-Hu PANG, Guang-Fu LIAO, Xiao-Yu HU, Quan-Yuan ZHANG, Zu-Shun XU, [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Here we report a novel surface modified bamboo charcoal/TiO2 (SMBC/TiO2) nanocomposites with high adsorption and photocatalytic property. SMBC were prepared by a wet oxidization method of cheap natural bamboo charcoal (BC) with good absorbent and chemical stabilities. After modification, high density of carboxyl groups
Here we report a novel surface modified bamboo charcoal/TiO
2
(SMBC/TiO
2
) nanocomposites with high adsorption and photocatalytic property. SMBC were prepared by a wet oxidization method of cheap natural bamboo charcoal (BC) with good absorbent and chemical stabilities. After modification, high density of carboxyl groups were generated on the surface of BC, thus SMBC particles can be easily dispersed in water and have stronger interactions with TiO
2
nanoparticles, which ensure SMBC uniformly coated on TiO
2
. And SMBC/TiO
2
nanocomposties have much higher specific surface area than BC/TiO
2
, which could offer higher adsorption capacity. The saturated adsorption capacity of SMBC/TiO
2
is approximately 1.6 times, 12.1 times as great as BC/TiO
2
and pure TiO
2
, respectively. The synergetic effect of adsorption and catalysis endow SMBC/TiO
2
composites much higher photocatalytic activity than BC/TiO
2
and pure TiO
2
for MB degradation, and the rate constant for MB photocatalytic degradation of SMBC/TiO
2
was almost 7 times and 6 times as large as BC/TiO
2
and pure TiO
2
, respectively..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 219 (2019)
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Sphere-like Hierarchical Y Zeolite Fabricated by Steam-assisted Conversion Method
Yan-Ze DU, Xiao-Na YANG, Wei-Wei NING, Qing-Lan KONG, Bo QIN, Jia-Jun ZHENG, Wen-Lin LI, Rui-Feng LI, [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], [in Chinese], and [in Chinese]
Sphere-like hierarchical Y zeolite was synthesized by a “steam-assisted conversion (SAC)” procedure. The as-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption, solid-state nuclear magnetic resonance (NMR
Sphere-like hierarchical Y zeolite was synthesized by a “steam-assisted conversion (SAC)” procedure. The as-synthesized samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N
2
adsorption-desorption, solid-state nuclear magnetic resonance (NMR) spectra, and Fourier transform infrared (IR) spectroscopy. Results observed by SEM displayed that the as-synthesized Y zeolite was sphere-like polycrystalline aggregates composed of primary crystals with size of about 50-300 nm. These results exhibited that some polycrystalline aggregates were hollow Y zeolite spheres. Combined with characterization results of FT-IR,
29
Si NMR, SEM, and TEM, a mechanism illustrating formation of the hollow Y zeolite polycrystalline spheres was proposed..
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Journal of Inorganic Materials
Publication Date: Feb. 20, 2019
Vol. 34, Issue 2, 225 (2019)
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