Subjects -> MANUFACTURING AND TECHNOLOGY (Total: 363 journals)     - CERAMICS, GLASS AND POTTERY (31 journals)    - MACHINERY (34 journals)    - MANUFACTURING AND TECHNOLOGY (223 journals)    - METROLOGY AND STANDARDIZATION (6 journals)    - PACKAGING (19 journals)    - PAINTS AND PROTECTIVE COATINGS (4 journals)    - PLASTICS (42 journals)    - RUBBER (4 journals) CERAMICS, GLASS AND POTTERY (31 journals)
 Showing 1 - 29 of 29 Journals sorted alphabetically Advances in Applied Ceramics       (Followers: 4) Boletín de la Sociedad Española de Cerámica y Vidrio       (Followers: 1) Ceramics Ceramics International       (Followers: 26) CeROArt       (Followers: 1) Challenging Glass Conference Proceedings       (Followers: 1) Crystal Growth & Design       (Followers: 13) Glass and Ceramics       (Followers: 3) Glass Technology - European Journal of Glass Science and Technology Part A       (Followers: 1) International Journal of Applied Glass Science       (Followers: 2) International Journal of Ceramic Engineering & Science Journal of Advanced Ceramics       (Followers: 9) Journal of Asian Ceramic Societies Journal of Ceramics       (Followers: 3) Journal of Non-Crystalline Solids       (Followers: 7) Journal of Non-Crystalline Solids : X Journal of the American Ceramic Society       (Followers: 24) Journal of the Australian Ceramic Society Journal of The Chinese Ceramic Society Journal of the European Ceramic Society       (Followers: 16) Journal of the Korean Ceramic Society : 한국세라믹학회지 Liquid Crystals Today       (Followers: 1) Molecular Crystals and Liquid Crystals       (Followers: 1) New Journal of Glass and Ceramics       (Followers: 6) Old Potter's Almanack Open Ceramics Powder Metallurgy and Metal Ceramics       (Followers: 7) Progress in Crystal Growth and Characterization of Materials       (Followers: 8) Transactions of the Indian Ceramic Society       (Followers: 1)
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 Journal of the Australian Ceramic SocietyNumber of Followers: 0      Hybrid journal (It can contain Open Access articles) ISSN (Print) 2510-1560 - ISSN (Online) 2510-1579 Published by Springer-Verlag  [2469 journals]
• Structural, morphological, and gas sensing properties of Co-doped ZnO
nanoparticles

Abstract: Undoped and Co-doped ZnO nanoparticles (NPs) are prepared by a co-precipitation method. X-ray diffraction analysis confirms the undoped and Co-doped ZnO nanoparticles exhibited a hexagonal (wurtzite) crystal structure. Lattice parameters decreased slightly with Co concentration. The average crystallite size and microstrain were investigated by Williamson- Hall (W-H) analysis. The FESEM studies revealed the growth of nanoparticles with grain size about 42–65 nm. UV-visible absorption studies show the red shift in Co-doped ZnO samples. The sensor response was estimated by the change in the electrical resistance of the sample in the presence and absence of ammonia gas with fixed concentration of 10 ppm at 50 °C. The sensor response is found to be increased with the increase in doping concentration of Co. The sensor response in relation to Co concentration has been systematically studied. Co-doped ZnO sensor is well thought out as a novel gas sensor with large sensing characteristics; at the same time, the operating temperature of the sensor of 50 °C is significantly attractive to a greater extent owing to their long-term stability and less power utilization.
PubDate: 2022-05-18

• Facile chemical synthesis and electrochemical studies of CNO-CGO
nanocomposite electrolytes for LTSOFC application

Abstract: Novel compositions of Gd3+ and Nd3+ co-doped cerium oxide nanocomposite according to the system of Ce1-xNdxO2-δ-Ce1-yGdyO2-δ with three different compositions, namely, Ce0.90Nd0.10O2-δ-Ce0.90Gd0.05O2-δ (CNO-CGO I), Ce0.95Nd0.05O2-δ-Ce0.90Gd0.10O2-δ (CNO-CGO II) and Ce0.90Nd0.10O2-δ-Ce0.90Gd0.10O2-δ (CNO-CGO III) have been synthesized by a simple wet-chemical precipitation method and studied as electrolytes for low temperature solid oxide fuel cells (LTSOFCs). The phase, functional, particulate, microstructural, and electrical properties have been studied by XRD, Raman, FTIR, particle size, SEM, and EDAX studies. The addition of Nd3+ and Gd3+ions stabilized the cubic fluorite structure which is confirmed from XRD studies. The expansion of lattice parameters and contraction has been observed on account of their ionic radii trend. The formation of cubic fluorite structure has been confirmed by XRD studies. Complex impedance analysis was performed at the temperature range from 300 to 600 °C in air atmosphere. Compositions of the system offer competitive oxide ion conductivities in the low temperature range. CNO-CGO III has been found to be an optimum composition with ionic conductivity of 7.33 × 10−3 S/cm at 600 °C and activation energy of 0.3850 eV. Hence, the result suggests that the composition of CNO-CGO III can be a potential electrolyte for LT-SOFC.
PubDate: 2022-05-14

• Efficiency of TiO2-supported Ni-Mo-Ru–B catalyst for hydrogen production
from potassium borohydride hydrolysis

Abstract: In this study, TiO2-supported Ni-Mo-Ru–B (TiO2@Ni-Mo-Ru–B) catalyst was synthesized by chemical reduction method for hydrogen production from the hydrolysis of potassium borohydride (KBH4) solution. The characterizations of the synthesized catalysts were carried out with BET, XRD, and SEM. In hydrolysis experiments, the effects of parameters such as KOH concentration, KBH4 concentration, catalyst amount, metal/TiO2 ratio, and temperature on hydrogen production rate were investigated. The optimum metal/TiO2 ratio was determined as 10% and the hydrogen production rate of the catalyst at 30 °C was calculated as 2410.28 mL/min.gcat. In addition, the reaction rate order was found to be 0.8 (nth order); accordingly, the value of the activation energy was obtained from the Arrhenius equation as 51.807 kJ/mol.
PubDate: 2022-05-14

• Anodic TiO2 nanotube: influence of annealing temperature on the

Abstract: The effect of annealing temperature on the morphology, structure, and photocatalytic response of TiO2 nanotubular prepared by anodization of a pure titanium foil was investigated. The anodization was carried out in a glycerol/H2O/NH4F electrolyte at room temperature, with two-electrode configurations. The morphology and structure of the nanotubes were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Raman spectroscopy. The results revealed that the annealing temperature affects strongly the morphology, the crystallinity, and the phase composition of the TiO2 nanotubes. The as-anodized TiO2 nanotube layers present an amorphous structure and the crystallization to the anatase phase begins at 400 °C. In addition, the rutile phase was observed at 600 °C. Of the anatase phase, 83.3% is transformed into rutile when annealing temperature increases from 400 to 700 °C. It is found that the phase composition of TiO2 impacts directly the photocatalytic degradation of the carbamazepine. The high photocatalytic activity was reached when the mixture of anatase and rutile exhibited a composition of about 56.3% and 43.7%, respectively. Increasing solution pH from 4 to 10 increases the degradation efficiency from 74.6 to 83%.
PubDate: 2022-05-11

• Sr/Ce co-immobilization evaluation and high chemical stability of novel
Sr0.5Zr2(PO4)3–CePO4 composite ceramics for nuclear waste forms

Abstract: Sodium zirconium phosphate (labeled as NZP)-monazite-type (1-x)Sr0.5Zr2(PO4)3–xCePO4 (x = 0–1.0) composite ceramics, which were designed to simultaneously immobilize simulated fission nuclide Sr and variable valence actinide nuclide Ce, were in situ prepared by one-step microwave sintering technique. The feasibility of Sr/Ce co-immobilization was evaluated via an investigation on the phase evolution, microstructure, density, Vickers hardness, and chemical stability of the composite ceramics. The Ce valence state in the composite ceramics was further ascertained by X-ray photoelectron spectroscopy. It was shown that the Sr/Ce co-immobilized composite ceramics only consisted of Sr0.5Zr2(PO4)3 and CePO4 crystalline phases that were compatible well to each other. Sr and Ce were independently incorporated into Sr0.5Zr2(PO4)3 phase and CePO4 phase, respectively. The valence state of Ce in composite ceramics existed in trivalent state. And the existence of CePO4 phase caused the grain refinement and facilitated the densification of the composite ceramics. The composite samples all showed a highly uniform and dense microstructure, whose relative density was higher than 95% and Vickers hardness could attain 774 HV1. Importantly, the series of Sr0.5Zr2(PO4)3–CePO4 composite ceramics exhibited higher chemical stability than that of the monophase Sr0.5Zr2(PO4)3 or CePO4 ceramics, in which the normalized leaching rates of Sr and Ce were below 10−4 g·m−2·day−1 and 10−7 g·m−2·day−1 order of magnitude, respectively. The NZP-monazite-type composite ceramics has the potential to be a host for the disposal of high-level nuclear wastes containing multiple radionuclides.
PubDate: 2022-05-10

• Fixed bed column adsorption of sodium ion by zeolite synthesis from kaolin
Malaysia: experiments and prediction via breakthrough curves

Abstract: A continuous adsorption analysis was performed in a fixed-bed column to model the removal of sodium ions in seawater solution using the synthesized zeolite A (Na12Si12Al12O48(NaNO3)10(H2O) that was produced from Malaysian's kaolin. The effect of flow rate, influence concentration of sodium ions from seawater solution and zeolite bed height was investigated at a pH range of 6–8. The adsorption isotherm study by using the breakthrough curve analysis was used to model the removal process based on different flow rates, sodium ion concentration and bed height. Next, the kinetic model was used to illustrate the kinetic of particles' movement at different controlled parameters using Thomas, Adams–Bohart, and Yoon–Nelson. From the breakthrough curve analysis, the breakthrough capacity, qB (mg/g) result for flow rate (15.4, 10.64, and 7.7 mg/g) show decreases with increases in flow rate (5, 8, and 11 mL/min), respectively. The breakthrough capacity, qB (mg/g) for sodium ion concentration (15.4, 7.7, and 4.55 mg/g) decrease with decreases of sodium ion concentration (280, 140, and 70 mg/L) respectively. The breakthrough capacity, qB (mg/g) for bed height, increased (15.4, 18.67, and 36.4 mg/g) with increases in bed height (1, 1.5, and 2 cm), respectively. From the kinetic column result, the Adam Bohart model shows a better result compared to the Thomas model and Yoon and Nelson model based on the value of correlation coefficient (R2). The value of the correlation coefficient, R2 of Adam Bohart model, gives a higher value range of R2 (0.86–0.95) for flow rate, R2 (0.82–0.93) for bed height, and R2 (0.90–0.95) for ion concentration compared to the Thomas model with R2 range value 0.84–0.94 for flow rate, R2 (0.72–0.89) for bed height and R2 (0.78–0.88) for ion concentration and Yoon and Nelson model, R2 (0.84–0.94) for flow rate, R2 (0.69–0.89) for bed height and R2 (0.78–0.87) for ion concentration. The conducted analysis has shown that the column adsorption model of sodium ion adsorption by Zeolite-A was able to be expressed in Adam Bohart Model at the different flow rate, bed height and initial sodium ion concentration. The experimental results and model analysis showed that the synthesized zeolite A column can be used in desalination processes to extract sodium ions from seawater solution. The important purpose of eliminating the sodium ion in seawater is for drinking purposes.
PubDate: 2022-05-10

• The role of titania on gamma and neutron attenuation competence of sodium

Abstract: A detailed investigation of the role of titania on gamma and neutron attenuation competence of sodium lead borosilicate 30PbO-20SiO2-(50—y)Na2B4O7 -xTiO2, where y = 0, 10, 20, 30, 40, and 45 mol%) glasses has been evaluated. XCOM and EXABCal softwares have been utilized to achieve the purposes. The increasing (decreasing) in the molar content of TiO2 (Na2B4O7) from 0 (50) to 45 (5) mole % in the glasses subsequently increases the mass density and improves the photon absorbing ability of the glasses. The values of mass attenuation coefficient (MAC) were followed the same trend for all PSNT-glasses throughout the energy spectrum as at maximum (minimum) energy (MAC)PSNT-0 = 39.29 (0.03), (MAC)PSNT-10 = 42.83 (0.031), (MAC)PSNT-20 = 46.91 (0.032), (MAC)PSNT-30 = 51.66 (0.034), (MAC)PSNT-40 = 57.25 (0.035), and (MAC)PSNT-45 = 60.44 (0.036) cm2/g. Linear attenuation coefficient (LAC) values were followed the same trend as MAC values. The effective atomic number (Zeff) were varied from 15.72–61.84 for PSNT-0, 17.00–61.10 for PSNT-10, 18.63–60.41 for PSNT-20, 20.79–59.76 for PSNT-30, 23.81–59.14 for PSNT-40, and 25.81–58.85 for PSNT-45. For most part of the energy spectrum, Zeff(PSNT-45) > Zeff(PSNT-40) > Zeff(PSNT-30) > Zeff(PSNT-20) > Zeff(PSNT-10) > Zeff(PSNT-0). The increasing in the titanium content of the glasses leads to gradual reduction in half value tenth (HVT). The exposure buildup factor (EBF) is noticed to be high at absorption edges and energies where incoherent scattering are high. The fast neutron removal cross-section (FNRCS) of the glasses was 0.0943, 0.0930, 0.0901, 0.0847, 0.0875, and 0.090 cm−1 for PSNT-0, PSNT-10, PSNT-20, PSNT-30, PSNT-40, and PSNT-45, respectively. Generally, the outcome results confirm that the PSNT-45 is the best photon absorber among the PSNT-glasses and the PSNT-0 is the best neutron shielding ability.
PubDate: 2022-05-05

• Preparation and characterization of spray pyrolysized
strontium-silver-doped mesoporous bioactive glass micron spheres

Abstract: Mesoporous bioactive glass (MBG) is a remarkable biomaterial for biomedical applications due to its excellent specific surface area, bioactivity, and biocompatibility. By adjusting doped ions used in bioactive glasses (BGs), the properties along with the changes of biological responses can be controlled. For the purpose of safe and effective effects on bone regeneration and formation, strontium (Sr) is selected as a doped ion source in BGs to induce promising biological responses. Due to difficulties to detect osteoporosis in the early phase, the clinic solution is orthopedic surgery. However, there are several cases of bacterial infection called surgical site infection. Thus, a biomaterial with the ability against bacterial activity and able to promote osteoblast cells for bone regeneration is critical and needed. There have been reports that metal ion–doped BG particles can activate a high inhibitory effect on bacterial growth. In this work, MBG microspheres were fabricated using the spray pyrolysis method with the addition of silver (Ag) together with Sr as the dopant. The phase information and particle morphology were evaluated by X-ray diffractometer and field emission scanning electron microscope, respectively. The antibacterial test was conducted using the bacteria colony counter method. The cell viability was investigated by MTT assay. In vitro bioactivity was investigated based on Kokubo’s protocol. The pure and doped MBG particles were characterized by X-ray diffraction to determine the growth of the hydroxyapatite layer in simulated body fluid solution. Finally, the observations reveal that the Sr- and Ag-doped MBG powders enhanced the antibacterial capability, cell viability, and hydroxylapatite formation rate.
PubDate: 2022-05-02

• The corrosion behavior of Ni–Fe and Ni–Fe–TiC nanoparticles
deposited using pulse electrodeposition on low-carbon steel

Abstract: Abstract In this study, the nickel–iron–titanium carbide (Ni–Fe–TiC) nanocomposite was applied on the St14 low-carbon steel via pulse‌ electrodeposition. Electroplating was applied on the substrate with different values ​​of current density, frequency, duty cycle, electroplating time (t) and concentration of TiC nanoparticles, and the properties of the applied coatings were evaluated. To the study the microstructure and morphology of the applied coatings, field emission electron microscope (FESEM) was used. The amount of deposited elements in the coating was determined by energy-dispersive spectroscopy (EDS). To evaluate the corrosion resistance of the coatings, potentiodynamic polarization and electrochemical impedance (EIS) tests were carried out in 3.5% NaCl solution as a corrosive environment. The optimum coating was obtained at the current density (J) of 30 mA/cm2, duty cycle ( $$\gamma$$ ) of 60%, frequency (f) of 20 Hz and 2 g/L concentration of TiC nanoparticles. The optimum coating increased the corrosion potential from -0.675 V to -0.332 V and decreased the corrosion current density from 157.200μA/cm2 to 0.790μA/cm2. The presence of TiC nanoparticles in the coating reduced the corrosion current density from 2.130μA/cm2 (Ni–Fe coating) to 0.790μA/cm2 (Ni–Fe–TiC nanocomposite coating).
PubDate: 2022-04-29

• Effect of Y2O3 doping on a gehlenite/magnesia-alumina spinel obtained by
sintering secondary aluminium ash

Abstract: Abstract Due to the rapid development of China’s regeneration industry, secondary aluminium ash (SAA) has been extensively produced. The reuse of SAA and Y2O3 doping was studied in this research. This proved that SAA can turn into a raw material for gehlenite/magnesia-alumina spinels. Furthermore, doping with Y2O3 can aggrandize the densification feature of gehlenite/magnesia-alumina spinels. The densification of the gehlenite/magnesia-alumina spinel without Y2O3 was lower than that of the doped spinel in the temperature range of 1573 to 1773 K. At 1673 K, 3 wt% Y2O3 was added to the gehlenite/magnesia-alumina spinel. It had a density of 2.05 g·cm−3 and a compressive strength of 91.2 MPa. Generally, 3 wt% Y2O3 was added, and the sintering temperature at 1673 K was appropriate. The elevation of the densification feature was also attributable to the solubility of Y2O3 and the formation of a low-viscosity liquid phase such as YCaAl3O7. The SAA can be reused for the recovery of gehlenite/magnesia-alumina spinels. Doping it with Y2O3 can broaden its reutilization in new water-resistant ceramic materials.
PubDate: 2022-04-27

• An experimental and theoretical investigation of Co-containing
hydroxyapatites prepared at different temperatures

Abstract: Abstract In the present paper, the effects of various calcination temperatures of 675, 775, 875, and 975 °C on the structural properties of 0.8 at.% Co-containing hydroxyapatites (HAps) were investigated by using X-ray diffraction (XRD) analysis, Fourier transform infrared (FTIR) spectroscopy, differential thermal analysis (DTA), and scanning electron microscopy (SEM). A density functional theory (DFT) has been applied to find out the energy band gap and density of states (DOS). It was found that the crystallite size and lattice strain gradually increased with increasing temperature. For each sample, biphasic structure was observed. The phase distribution was affected by the temperature. The significant changes, dependent on the calcination temperature, in the crystallinity percent, stress, and anisotropic energy density values were detected. The functional groups of phosphate and hydroxyl associated with the formation of the HAp phase were detected for each sample. It was observed that the calcination temperature affected the morphology.
PubDate: 2022-04-25

• Investigation of colour and surface changes of ceramic CAD/CAM blocks with
different surface treatments after immersion to different beverages

Abstract: Abstract This study aims to investigate the colour and surface changes of CAD-CAM porcelain blocks with different surface finishing treatments after being deposited into beverages. A total of 128 disc-shaped samples obtained from different CAD/CAM materials [Monolithic Zirconia (Z), Vita Suprinity (VS) and Vita Enamic (VE)] and feldspathic porcelain (FP) as the control group were divided into two subgroups [manual polish (M), glaze (G)] according to their surface finishing treatments. Measurements of the samples kept in different liquids (coffee and wine) after initial surface roughness and colour measurements (ΔE) were repeated on the 14th day. It was measured using a spectrophotometer for colour value measurement and an optical profilometer for surface roughness values, and SEM images were taken. When the initial and 14th-day surface roughness measurements were compared, significant differences were found in all groups (p < 0.05). The lowest roughness value (0.10 ± 0.001) was obtained in the VS-M group aged into wine, while the highest roughness value (0.33 ± 0.001) was obtained in the VE-M group aged into wine. Comparing the averages of colour changes (ΔE), the highest ΔE average was found in the FP-M group deposited into coffee (3.70 ± 0.50), while the lowest ΔE value was found in the VE-M group deposited into wine (0.50 ± 0.13). Depending on the structural characteristics of porcelain groups in terms of surface roughness and colour, we can say that the surface finishing treatment and beverage types have different effects.
PubDate: 2022-04-25

• Deep eutectic solvent based on choline chloride and phenol as electrolyte
additives in dye-sensitized solar cells: a comparison with
4-tert-butylpyridine

Abstract: Abstract The electrolyte additives are used in dye-sensitized solar cells to improve the photovoltaic performance of the devices, but they still remain their problems on the long-term stability of the solar cells and chemical safety. We have studied the use of two deep eutectic compounds based on choline chloride and phenol with two ratios of 1:2 and 1:3 as alternative electrolyte additives. These compounds own their advantages as eco-friendly chemicals, low cost, and simple synthesis process even at a large amount production. The two compounds, in comparison with the popular additive 4-tert-butylpyridine (4-TBP), were implemented in the functional devices which were characterized by current–voltage measurement and electrochemical impedance spectroscopy. Results showed that the two new additives could improve open circuit voltage values about 10–40 mV, whereas about 100 mV for 4-TBP, compared to the case without additives. Furthermore, using these new additives could result in a higher the short circuit current (Jsc) which was not observed with 4-TBP. These phenomena were explained by the shielding effects and charge transfer processes at the interfaces of electrodes and electrolyte. This study helped to design new efficient and eco-friendly additives for dye-sensitized solar cells in future scale-up production and commercialization.
PubDate: 2022-04-23

• Preparation and characterization of Al2O3-SiC-C castables using
ferrotitanium slag: structural commonalities between titanium–alumina
slag and calcium alumino-titanate

Abstract: Abstract To promote sustainable development in the refractory industry, ferrotitanium slags, including titanium–alumina slag (TAS) and calcium alumino–titanate (CAT), were used in this study to prepare Al2O3-SiC-C (ASC) castables. In this study, low-cost ASC castables were prepared using TAS and compared with those prepared using CAT in different atmospheres. The results show that metallic inclusions and Ti-concentrated areas in TAS aggregates lead to lower cold mechanical strength in TAS-based castables when fired in air. The performance of the TAS-based castables was similar to that of the CAT-based castables in low-oxygen environments. In the TAS aggregates, titanium suboxide showed local enrichment at the crystal boundary of Al2O3 in the form of Ti2O3. Both CAT and TAS showed the structural commonalities that aggregates were damaged along the boundary of the main crystal phase after heat treatment in an oxidizing atmosphere.
PubDate: 2022-04-22

• Physicochemical changes of hydroxyapatite, V2O5, and graphene oxide
composites for medical usages

Abstract: Abstract Hydroxyapatite (HAP), vanadium pentoxide (V2O5), and graphene oxide (GO) are three biocompatible materials. The antibacterial is the main characteristics of the produced TNC. Furthermore, the structural investigation was done by x-ray diffraction patterns (XRD). The investigation showed inhibition in the growth of V2O5 and in contrast with HAP, where high growth was noticed. According to XRD data, the crystallite size of HAP was grown from 6 to 8.2 nm starting with the HAP composition to TNC. The nanorod shapes of HAP reached an average of 141 and 30 nm for length and diameter. In addition, the roughness average parameter (Ra) reached 47.5 nm. The microhardness has been evaluated. It started from 3.3 ± 0.2 GPa for pure HAP and decreased to 2.9 ± 0.3 GPa for the dual composite of HAP/V2O5, and improved to 4.1 ± 0.2 GPa for the ternary combination of HAP/V2O5/GO. The biological response was represented in the cell viability measurements which increased from 96.5 ± 4 to 99.7 ± 5% at the final NC (TNC). In addition, the measurements were done toward the human osteoblast cell line in vitro. Furthermore, the antibacterial activity was measured against negative gram and positive gram strains. The inhibition zone reached 17.1 ± 1.5 and 16.3 ± 1.4 mm against E. coli and S. aureus. The results refer to the ability to be suggested TNC for biomedical applications.
PubDate: 2022-04-14

• Effect of applying electric field on suspension stability during
electrophoretic deposition of ceramic particles in nonaqueous media: a
case study

Abstract: In this paper, the variation of suspension stability under the electric field was studied. Ceramic suspensions such as YSZ/acetyl acetone, YSZ/1propanol, and SnO2/ethanol were analyzed by applying different voltages. The novel turbidimetry technique was employed to illustrate the stability changes versus electrophoretic deposition (EPD) time. Macro-photography was employed to study the colloidal stability before and after EPD. Also, the weight of the deposited particles was measured. Particles in the suspension were sediment after applying voltage, making the suspension transparent in our deposition cell, especially at 100 V. The electrical conductivity of suspension increased by applying the electric field, showing a peak at 100 V. The suspension conductivity measurements also revealed a peak at 100 V. The occurred transparency became more in-depth over time. As suspension stability is an essential factor for a successful EPD process, the electric field-assisted agglomeration of particles should be considered in tests to reach repeatable results. Our research showed that despite the use of high voltage in routine EPD research, the instability of suspensions and its effect on the results of the coating should be considered. Graphical abstract
PubDate: 2022-04-14

• Physical and spectroscopic studies of CaF2-Al2O3-Bi2O3-B2O3-CuO glasses

Abstract: Abstract Over the past decade, oxy-fluoride glasses are the subject of investigation by many researchers. Calcium fluoride incorporated alumina-bismuth borate glasses reinforced with minute quantity of copper ions have been synthesized by melt-quenching process and the amorphous nature is approved by X-ray diffraction (XRD) spectra. The samples are further analyzed, to know the effect of Al2O3 on CaF2-Bi2O3-B2O3–CuO glasses, with the help of density, molar volume, optical, electron paramagnetic resonance (EPR), and Raman and Fourier transform infrared (FTIR) spectra. A decreasing trend was observed in density values with increasing Al2O3 even though the relative density of Al2O3 is higher than the CaF2. This decrease in density is attributed to the larger bond length of Al-O in AlO4 units as compared to B-O bond length in BO3 and BO4 units. The bandgap values estimated from optical absorption spectra were found to increase with Al2O3 content, indicating the decrement in the number of non-bridging oxygens. Spin-Hamiltonian parameters $${g}_{\parallel }$$ > $${g}_{\perp }$$ > $${g}_{\mathrm{e}}$$ ( $${g}_{\mathrm{e}}$$ = 2.0023) and $${A}_{\parallel }$$ $$>{A}_{\perp }$$ are of the opinion that the Cu2+ ions were taken the positions of octahedral sites with tetragonal distortion and ground state being $${d}_{{\mathrm{x}}^{2}-{\mathrm{y}}^{2}}$$ orbital. FTIR and Raman spectra suggested that these glasses are composed of BiO6, BO3, BO4, and alumina polyhedral.
PubDate: 2022-04-13

• Formation of silicide/spinel ceramic composites via Al- and Mg-based
thermitic combustion synthesis

Abstract: Abstract Formation of MoSi2–spinel (MgAl2O4) composites with a wide composition range of MoSi2/MgAl2O4 = 1.0–5.0 was studied by thermitic combustion synthesis in the mode of self-propagating high-temperature synthesis (SHS). Two combustion systems conducted contained not only Mo and Si powders, but also different thermite reagents of 7/12 MoO3 + Mg + 1/2 Al and MoO3 + 2 Al in the presence of Al2O3 and MgO, respectively. In agreement with the calculated adiabatic reaction temperatures, measured combustion temperature and flame-front velocity decreased with increasing MoSi2/MgAl2O4 ratio. The XRD analysis indicated that MoSi2 was formed in α and/or β phases and that β-MoSi2 dominated as the combustion temperature above 1550 °C but α-MoSi2 prevailed as the temperature below 1350 °C. Spinel MgAl2O4 was produced through the dissolution of thermite-produced Al2O3 and MgO into pre-added MgO and Al2O3, respectively. The fracture surface morphology of the products exhibited that granular MoSi2 particles were distributed over or embedded partially into the dense and connecting substrate formed by MgAl2O4.
PubDate: 2022-04-12

• A comprehensive study on the charged-uncharged particle shielding features
of (70 − x) CRT–30K2O–xBaO glass system

Abstract: Abstract The going study aims to investigate the charged-uncharged particles’ shielding performance of the (70 − x) CRT–30K2O–xBaO glass system for x = 0–20 mol% via the MCNPX simulation, analytical calculations, Phy-X: PSD, and SRIM software. For this purpose, three types of glasses coded as G-C1, G-C2, and G-C3 are irradiated by the 252Cf neutron source. Applying Watt Fission Distribution (WFD) and Doppler Effect (DE), the neutron-gamma photon spectra are extracted and the obtained results are shown graphically. The outcomes reveal that G-C1 can better shield neutrons among the rest of the chosen samples and a strong linear relationship is found between equivalent absorbed dose rate and Fast Neutron removal Cross Section (FNRCS; cm−1) with R2 = 0.99225. In addition, by increasing the density from 2.8232 g.cm−3 for sample coded as G-C1 to 3.2266 g.cm−3 for the sample coded as G-C3 an ascending order of (LAC)G-C1 < (LAC)G-C2 < (LAC)G-C3 is monitored and the best gamma photon-shielding competence is recorded for G-C3. Moreover, the glass samples’ Transmission Factor (TF) and Radiation Protection Efficiency (RPE) are evaluated and discussed in detail.
PubDate: 2022-04-11

• Structural, electric and dielectric studies on Er3+/Yb3+ co-doped zinc
phosphate glasses

Abstract: Abstract (42.25-x)Na2O + (42.25-x)P2O5 + 15ZnO + 0.5Er2O3 + xYb2O3 with (x = 0, 0.5,1, and 1.5%) were processed using the melt quenching method. DSC is used to control the stability of the glass. XRD patterns and Raman analysis were performed to understand the structure of the glass samples. The impedance spectra were analyzed in terms of an equivalent circuit involving bulk resistor (Rb) and bulk constant phase elements (CPEb). The ac-conductivity analysis was used to evaluate the effect of increasing the percentage of Yb2O3in the glass. Our findings prove that the relaxation time decreases with rising temperature, as well as the average value of the activation energy was in the order of 0.97 eV, which leads to an increase in the ionic conductivity. An improvement in ionic conductivity was demonstrated with the incorporation of Er2O3 and Yb2O3contents.
PubDate: 2022-04-06

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