scholarly journals One-Pot Synthesis and Characterization of VO2(B) with a Large Voltage Window Electrochemical Performance in Aqueous Solution

2020 ◽  
Vol 10 (8) ◽  
pp. 2742
Author(s):  
Xiaoyu Liu ◽  
Jiqi Zheng ◽  
Xuyang Jing ◽  
Yan Cheng ◽  
Changgong Meng
Keyword(s):  
Vanadium Dioxide ◽  
Average Pore Size ◽  
Bet Surface Area ◽  
Porous Structures ◽  
One Pot ◽  
Average Pore ◽  
Discharge Current Density ◽  
One Step ◽  
Adsorption Desorption

B-type vanadium dioxide (defined as VO2(B)) nanobelts were synthesized through using commercial ammonium metavanadate, oxalic acid via one-step hydrothermal technique. The structure of VO2(B) was characterized using different instruments. N2 adsorption-desorption isotherms revealed that the VO2(B) nanobelts were porous structures where BET surface area was 10.4 m2·g−1, the pore volume was 0.0687 cm3/g, and the average pore size was 42.7 nm. Furthermore, the VO2(B) nanobelts as supercapacitors electrode exhibited a large voltage window (−0.8~1.0 V). The measured capacitance was based on the pseudocapacitance. When the discharge current density is 0.5, 1, and 10 A·g−1, the VO2(B) shows the specific capacitance of 287, 246, and 222 F·g−1, respectively.

Preparation of Porous Silica Microspheres by Polymerization-Induced Colloid Aggregation Method

2014 ◽  
Vol 898 ◽  
pp. 132-135 ◽  
Author(s):  
Jia Li He ◽  
Xiu Hua Chen ◽  
Wen Jie Zhu ◽  
Wen Hui Ma ◽  
Yong Yin Xiao ◽  
...  
Keyword(s):  
Average Pore Size ◽  
Urea Formaldehyde ◽  
Porous Silica ◽  
Total Pore Volume ◽  
Nitrogen Adsorption ◽  
Bet Surface Area ◽  
Silica Microspheres ◽  
Average Pore ◽  
Uf Resin ◽  
Adsorption Desorption

The UF resin/SiO2 composites microspheres with particle size of 2μm were successfully prepared by polymerization of silica sol from base-catalyzed hydrolysis of tetraethyl orthosilicate, and urea-formaldehyde via the PICA approach, and then calcination in air to remove organic UF resin and yield porous silica microspheres. The samples were characterized by Zetasizer NanoZS Instrument, SEM and Nitrogen adsorption-desorption isotherms. The results showed that the synthesized porous silica microspheres with a BET surface area of 67.01m2/g, a BJH average pore size diameter of 37.32 nm and a total pore volume of 0.69cm3/g, respectively.

scholarly journals Synthesis and Characterization of TiO2-CaO and TiO2-CaO-Fe2O3 Photocatalyst for Removal of Catechol

Molekul ◽  
2019 ◽  
Vol 14 (2) ◽  
pp. 140
Author(s):  
Candra Yulius Tahya ◽  
Wahyu Irawati ◽  
Karnelasatri Karnelasatri ◽  
Friska Juliana Purba
Keyword(s):  
Surface Area ◽  
Adsorption Property ◽  
Average Pore Size ◽  
Sol Gel ◽  
Bet Surface Area ◽  
Sem Images ◽  
Average Pore ◽  
Xrd Pattern ◽  
Two Peaks

TiO2-CaO and TiO2-CaO-Fe2O3 photocatalysts have been synthesized through the surfactant-assisted sol-gel method. The catalysts were characterized using XRD, FTIR, SEM-ED Sand BET surface area. XRD pattern showed the formation of anatase TiO2 crystal phase both in TiO2-CaO and TiO2-CaO-Fe2O3. The TiO2-CaO has higher crystallinity than TiO2-CaO-Fe2O3. Based on the peak refinement using Rietveld, there are two peaks identified as Fe2O3 hematite in the sample TiO2-CaO-Fe2O3.  BET surface area analysis showed that the average pore size of TiO2-CaO and TiO2-CaO-Fe2O3 catalysts are 8.04 and 8.41 nm respectively, indicating both catalysts are mesoporous.FTIR spectra show that the vibration of Ti-O, Ca-O, and Ca-TiO2 were observed in both catalysts. SEM images confirm that both catalysts are porous material. The catechol removal using TiO2-CaO and TiO2-CaO-Fe2O3 improved with the increase of catalyst concentration. After 360 minutes of UV radiation, the removal of catechol using TiO2-CaO-Fe2O3 reached 46.0%, 48.3%, and 69.2%, while when using TiO2-CaO, it reached 22.1%, 36.8%, and 57.0% for 0.1 g, 0.15 g, and 0.2 g of catalysts, respectively. The photocatalytic activity of TiO2-CaO-Fe2O3 is not so strong compared to TiO2-CaO catalyst but the catechol adsorption property of TiO2-CaO-Fe2O3 is higher than that of TiO2-CaO catalyst.

Synthesis and Structural Characterization of Oleic Acid Embedded Layered Magnesium Borate

2011 ◽  
Vol 399-401 ◽  
pp. 343-346
Author(s):  
Ai Min Chen ◽  
Pei Gu ◽  
Shu Fen Xu ◽  
Zhe Ming Ni
Keyword(s):  
Oleic Acid ◽  
Interlayer Spacing ◽  
Bet Surface Area ◽  
Structure Model ◽  
X Ray Diffraction ◽  
Magnesium Borate ◽  
Average Pore ◽  
X Ray ◽  
Adsorption Desorption

The organic-inorganic composite of oleic acid embedded layered magnesium borate was synthesized by low temperature hydrothermal method with magnesium chloride (MgCl2•6H2O), borax (Na2B4O7•10H2O) as reactants, oleic acid as the embedded agent. The structure and morphologies of the synthesized samples were investigated by X-ray diffraction, N2 adsorption-desorption isotherms, scanning electron microscopy and Fourier transform infrared spectroscopy techniques. The results suggest that the structure of oleic acid embedded magnesium borate is layered-by-layered, and the interlayer spacing was about 6 nm. And the sizes of the lamellar magnesium borate are in the range of 100 nm to 200 nm. The average pore diameter of the prepared product is 22.4 nm. The BET surface area and pore volume are 50.31 m2/g and 0.275 m3/g, respectively. The molecular structure model of oleic acid embedded layered magnesium borate is established.

Preparation and Characterization of Chitosan-Based Scaffolds for Biomedical Applications

2006 ◽  
Vol 514-516 ◽  
pp. 1005-1009 ◽  
Author(s):  
José V. Araújo ◽  
J.A. Lopes da Silva ◽  
Margarida M. Almeida ◽  
Maria Elisabete V. Costa
Keyword(s):  
Biomedical Applications ◽  
Freeze Drying ◽  
Average Pore Size ◽  
Composite Scaffolds ◽  
Average Pore ◽  
Chitosan Matrix ◽  
Freeze Dried ◽  
Porous Chitosan ◽  
Interconnected Structure

Porous chitosan/brushite composite scaffolds were prepared by a freeze-drying technique, starting from brushite suspensions in chitosan solutions. The obtained scaffolds showed a regular macroporous and interconnected structure with brushite particles uniformly distributed in the chitosan matrix. The variation of the brushite concentration affected the microstructure of the final freeze-dried scaffold, in particular, its porosity and its average pore size. The yield strengths of the composite scaffolds could also be improved by the increase of the brushite content.

scholarly journals Preparation of High-Performance Activated Carbon from Coffee Grounds after Extraction of Bio-Oil

Molecules ◽  
2021 ◽  
Vol 26 (2) ◽  
pp. 257
Author(s):  
Jie Ren ◽  
Nanwei Chen ◽  
Li Wan ◽  
Guojian Li ◽  
Tao Chen ◽  
...  
Keyword(s):  
Activated Carbon ◽  
High Performance ◽  
Average Pore Size ◽  
Total Pore Volume ◽  
Micropore Volume ◽  
Bet Surface Area ◽  
Average Pore ◽  
Activation Temperature ◽  
Coffee Grounds ◽  
Bio Oil

In this study, a new method for economical utilization of coffee grounds was developed and tested. The resulting materials were characterized by proximate and elemental analyses, thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and N2 adsorption–desorption at 77 K. The experimental data show bio-oil yields reaching 42.3%. The optimal activated carbon was obtained under vacuum pyrolysis self-activation at an operating temperature of 450 °C, an activation temperature of 600 °C, an activation time of 30 min, and an impregnation ratio with phosphoric acid of 150 wt.%. Under these conditions, the yield of activated carbon reached 27.4% with a BET surface area of 1420 m2·g−1, an average pore size of 2.1 nm, a total pore volume of 0.747 cm3·g−1, and a t-Plot micropore volume of 0.428 cm3·g−1. In addition, the surface of activated carbon looked relatively rough, containing mesopores and micropores with large amounts of corrosion pits.

Preparation and Characterization of Fe2O3/ SBA-15 for Fischer-Tropsch Process

2020 ◽  
Vol 850 ◽  
pp. 144-150
Author(s):  
Agija Stanke ◽  
Valdis Kampars ◽  
Oana A. Lazar ◽  
Marius Enachescu
Keyword(s):  
Average Pore Size ◽  
Direct Synthesis ◽  
Synthesis Method ◽  
Xrd Analysis ◽  
Hexagonal Structure ◽  
Catalyst Characterization ◽  
Average Pore ◽  
Pluronic P123 ◽  
Silica Source ◽  
Adsorption Desorption

In this study Fe2O3/SBA-15 catalyst was synthesized via direct synthesis method under acidic conditions using triblock copolymer Pluronic P123 as template, tetraethyl orthosilicate as a silica source and Fe (NO3)3∙9H2O as iron source. Template was removed using extraction and calcination. The obtained catalyst was characterized using XRD analysis, WDXRF spectroscopy, N2 adsorption-desorption analysis and STEM–EDX measurements. Results of catalyst characterization showed that the synthesized Fe2O3/SBA-15 is mesoporous silica with 2D p6mm hexagonal mesostructure loaded with 15.6 wt.% Fe2O3. Average pore size was 6.95 nm, homogeneous immobilized Fe2O3 nanoparticles do not disrupt the porous hexagonal structure of the support.

Adsorption of Cobalt Ions on Molded Magnesium Silicate

2013 ◽  
Vol 807-809 ◽  
pp. 704-707
Author(s):  
Li Li Mao ◽  
Hai Zeng Wang ◽  
Qing Wang
Keyword(s):  
Adsorption Process ◽  
Average Pore Size ◽  
Chemical Properties ◽  
Magnesium Silicate ◽  
Average Pore ◽  
Cobalt Ions ◽  
Adsorption Time ◽  
Physico Chemical ◽  
Adsorption Desorption ◽  
Adsorbent Dose

The groundwater contaminated with cobalt is attracted more and more concern. In this study, molded magnesium silicate (MMS) was successfully prepared and the physico-chemical properties were determined by N2 adsorption/desorption isotherm and Scanning Electron Microscopy (SEM). Surface area and the average pore size were 333.19 m2·g-1 and 4.442 nm. Adsorption experiments of removal of cobalt ions was investigated as the function of initial concentration, adsorbent dose and adsorption time. Adsorption process was rapid and adsorption equilibriums were achieved soon.

Small-angle neutron scattering characterization of processing/microstructure relationships in the sintering of crystalline and glassy ceramics

1991 ◽  
Vol 6 (12) ◽  
pp. 2706-2715 ◽  
Author(s):  
G.G. Long ◽  
S. Krueger ◽  
R.A. Gerhardt ◽  
R.A. Page
Keyword(s):  
Neutron Scattering ◽  
Microstructure Evolution ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Average Pore Size ◽  
Unit Surface Area ◽  
Average Pore ◽  
Sintering Mechanisms ◽  
Alpha Alumina

Small-angle neutron scattering measurements were used to examine the pore microstructure evolution of glassy silica and polycrystalline alpha-alumina as a function of sintering. It was shown that the two major sintering mechanisms, viscous flow and surface and volume diffusion, lead to very different microstructure evolution signatures in terms of the average pore size as a function of density. However, with respect to topology, the evolution of the porosity per unit surface area as a function of density is remarkably similar in the two systems.

Fabrication and Characterization of Mechanically Reinforced Collagen Sponge

2005 ◽  
Vol 288-289 ◽  
pp. 385-388
Author(s):  
Yosuke Hiraoka ◽  
Ueda Hiroki ◽  
Yu Kimura ◽  
Yasuhiko Tabata
Keyword(s):  
Cell Attachment ◽  
Average Pore Size ◽  
Collagen Sponge ◽  
Average Pore ◽  
Culture Studies ◽  
Collagen Solution ◽  
Freeze Dried ◽  
Interconnected Pore

This study describes an investigation of collagen sponge mechanically reinforced through the incorporation of poly(glycolic acid)(PGA) fiber. A collagen solution with PGA fiber homogeneously dispersed was freeze-dried, followed by dehydrothermal cross-linking to obtain collagen sponges incorporating PGA fiber. A collagen sponge without PGA fiber was prepared similarly by using the collagen solution. By scanning electron observation, the collagen sponges exhibited isotropic and interconnected pore structures with an average pore size of 180 µm, irrespective of PGA fiber incorporation. As expected, PGA fiber incorporation enabled the collagen sponge to significantly enhance the compression strength. In vitro cell culture studies revealed that the number of L929 fibroblasts initially attached was significantly greater for the collagen sponge incorporating PGA fiber than for the collagen sponge. In vitro cell proliferation studies revealed that the proliferation of cell was higher for the collagen sponge incorporating PGA fiber, by day 21, than the collagen sponge without PGA fiber. It is possible that shrinkage suppression results in the superior cell attachment and proliferation of sponge incorporating PGA fiber. After subcutaneous implantation into the backs of mice, the residual volume of collagen sponge incorporating PGA fiber was significantly large compared with that of collagen sponge. We concluded that the incorporation of PGA fiber is a simple way to reinforce collagen sponge without impairing the biocompatibility.

scholarly journals Preparation and Evaluation of Bioactivity of Porous Bioglass Tablets for Bone Tissue Regeneration

2019 ◽  
Vol 1 (3) ◽  
pp. 112-123
Author(s):  
Rohith Kumar R. ◽  
Sangeetha Ashok Kumar ◽  
K. Periyasami Bhuvana
Keyword(s):  
Surface Characterization ◽  
Mechanical Stability ◽  
Average Pore Size ◽  
High Surface ◽  
Bone Tissue Regeneration ◽  
Average Pore ◽  
Hydroxy Apatite ◽  
Sbf Solution

The present study endeavors in the preparation and characterization of semi crystalline 45S5 bioglass (BG) (SiO2-CaO-P2O5) through sol gel process. Dry press mold technique was used in the preparation porous BG tablets to examine the bioactivity through invitro studies. The synthesized BG powder was subjected to structural, morphological and mechanical characterization and the bioactivity was examined in vitro by immersing the BG tablet in the Simulated Body Fluid (SBF) solution. XRD pattern and the SEM micrographs revealed the semi crystalline nature of BG with spherical morphology. The elemental analysis confirms the presence of vital constituents required for Bone regeneration (Calcium, Phosphorous, Silica, and Sodium). The surface characterization of BG tablet reveals the pores structure of average pore size of 240nm which contributed to the high surface activity resulting in formation of carbonated hydroxy apatite (HCAP) when immersed in SBF. The disintegration studies denoted the stabilization period was after 48 of immersion of BG tablets in SBF solution. The compressive strength measurement of the tablet also reveals the higher mechanical stability.

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