scholarly journals Effect of the Sintering Temperature on the Compressive Strengths of Reticulated Porous Zirconia

2021 ◽  
Vol 11 (12) ◽  
pp. 5672
Author(s):  
Chae-Young Lee ◽  
Sujin Lee ◽  
Jang-Hoon Ha ◽  
Jongman Lee ◽  
In-Hyuck Song ◽  
...  
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Sintering Temperature ◽  
Porous Ceramic ◽  
Average Particle Size ◽  
Porous Ceramics ◽  
Average Particle ◽  
High Porosity ◽  
Wide Range ◽  
Porous Zirconia

Porous ceramics have separation/collection (open pore) and heat-shielding/sound-absorbing (closed pore) characteristics not found in conventional dense ceramics, increasing their industrial importance along with dense ceramics. Reticulated porous ceramics, a type of porous ceramic material, are characterized by a three-dimensional network structure having high porosity and permeability. Although there have been numerous studies of porous zirconia, which is already widely used, there are insufficient reports on reticulated porous zirconia, and it is still challenging to improve the compressive strength of reticulated porous ceramics thus far, especially considering that too few studies have been published on this topic. Therefore, we prepared reticulated porous zirconia specimens using the replica template method. In this study, the compressive strength outcomes of reticulated porous zirconia were analyzed by controlling the PPI value (25, 45, 60, and 80 PPI) of the sacrificial polymer template, the average zirconia particle size (as-received, coarse, intermediate, and fine), and the sintering temperature (1400, 1500, and 1600 °C). Consequently, we confirm that it is possible to prepare reticulated porous zirconia with a wide range of strengths (0.16~1.26 MPa) as needed with an average particle size and while properly controlling the sintering temperature.

scholarly journals The Effects of a Zirconia Addition on the Compressive Strength of Reticulated Porous Zirconia-Toughened Alumina

2021 ◽  
Vol 11 (19) ◽  
pp. 9326
Author(s):  
Chae-Young Lee ◽  
Sujin Lee ◽  
Jang-Hoon Ha ◽  
Jongman Lee ◽  
In-Hyuck Song ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Average Particle Size ◽  
Porous Ceramics ◽  
Solid Loading ◽  
Average Particle ◽  
High Porosity ◽  
Processing Conditions ◽  
Porous Metals ◽  
Porous Zirconia ◽  
Zirconia Toughened Alumina

Porous ceramics have attracted researchers due to their high chemical and thermal stability. Among various types of porous ceramics, reticulated porous ceramics have both high porosity and good permeability. These properties of porous ceramics are difficult to replace with porous metals and polymers. ZTA is used in a variety of applications, and a wealth of experimental data has already been collected. However, research reports on reticulated porous zirconia-toughened alumina (ZTA) are insufficient. Therefore, we prepared reticulated porous ZTA via the replica template method. In this study, various processing conditions (average particle size, zirconia content, solid loading, dispersant, and thickener) were adjusted to improve the compressive strength of the reticulated porous ZTA. As a result, the optimized processing conditions for improving the compressive strength of reticulated porous ZTA could be determined.

scholarly journals Enhancing Compressive Strength of Reticulated Porous Alumina by Optimizing Processing Conditions

2021 ◽  
Vol 11 (10) ◽  
pp. 4517
Author(s):  
Sujin Lee ◽  
Chae Young Lee ◽  
Jang-Hoon Ha ◽  
Jongman Lee ◽  
In-Hyuck Song ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Porous Alumina ◽  
Average Particle Size ◽  
Porous Ceramics ◽  
Solid Loading ◽  
Average Particle ◽  
High Porosity ◽  
Processing Conditions ◽  
Mechanical Instability ◽  
Porosity And Permeability

Recently, porous ceramics have received much attention from researchers because of their excellent thermal and chemical stabilities compared to their counterparts (such as porous polymers and metals), despite their inferior mechanical instability. Among the various types of porous ceramics, reticulated porous ceramics have significant industrial potential because of their synergistic high porosity and permeability. However, to the best of our knowledge, there is insufficient data on the processing conditions or preparing optimal reticulated porous alumina. Therefore, we prepared and characterized reticulated porous alumina specimens by controlling various processing conditions, namely average particle size, solid loading, binder, and dispersant. The data obtained were used to assess whether the compressive strength of the reticulated porous alumina could be enhanced and to discuss the potential of these materials for various applications.

scholarly journals Effect of Processing Conditions on the Properties of Reticulated Porous Diatomite–Kaolin Composites

2020 ◽  
Vol 10 (20) ◽  
pp. 7297
Author(s):  
Sujin Lee ◽  
Chae Young Lee ◽  
Jang-Hoon Ha ◽  
Jongman Lee ◽  
In-Hyuck Song ◽  
...  
Keyword(s):  
Porous Ceramic ◽  
Average Particle Size ◽  
Porous Ceramics ◽  
Solid Loading ◽  
Natural Material ◽  
Average Particle ◽  
High Porosity ◽  
Processing Conditions ◽  
Porous Metals ◽  
Mechanical Instability

Porous ceramics have been extensively investigated because of their high-temperature and chemical stabilities, which are far superior to those of porous polymers and porous metals, despite their mechanical instability. Among various kinds of porous ceramic, reticulated porous ceramics have attracted considerable attention because of their extremely high porosity, which is generally higher than 90% and can maximize the advantages of this class of materials. However, to the best of our knowledge, sufficient data are not available on the preparation of low-cost, abundant, and natural material-based reticulated porous ceramics. Therefore, we obtained and characterized reticulated porous diatomite–kaolin composites prepared under various processing conditions, such as solid loading, average particle size, and pore density. The experimental data were used to investigate whether the densities and compressive strengths of the reticulated porous diatomite–kaolin composite can be tailored, and to assess the potential of these materials in different application fields.

Characteristics of High Content Steel Briquettes Using Nanosized Solid Binders

2021 ◽  
Vol 21 (7) ◽  
pp. 3863-3867
Author(s):  
Seung-Ju Lim ◽  
Seong-Gyu Seo ◽  
Hyung-Sun Yoon
Keyword(s):  
Particle Size ◽  
Compressive Strength ◽  
Average Particle Size ◽  
Average Particle ◽  
Eds Analysis

In this study, we investigated the characteristics of high-content steel briquettes produced using various nanoscale solid binders and steel byproducts (SS, SCS, SLD, and BSD). The average particle size was 0.171 nm for S5, 0.065 nm for S1, 0.058 nm for S4, and 0.040 nm for S2 and S3. The SEM-EDS analysis of the solid power binder resulted in mostly rectangular images. The compressive strength of the high-content steel briquettes was 120 kgf/cm2, with the highest HSL1 using S4 binders. The compressive strength of the high-content steel briquettes was in the order of HSS4 > HSS1 > HSS3 > HSS5 > HSS2.

scholarly journals Preparation and Investigation of Intelligent Polymeric Nanocapsule for Enhanced Oil Recovery

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1093 ◽  
Author(s):  
Fang Shi ◽  
Jingchun Wu ◽  
Bo Zhao
Keyword(s):  
Particle Size ◽  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Colloidal Particles ◽  
Critical Concentration ◽  
Average Particle Size ◽  
Average Particle ◽  
Assembly Method ◽  
Recovery Capacity ◽  
Wide Range

Micro-/nanomotors colloidal particles have attracted increasing interest as composite surfactants, owing to the combined advantages of both Janus solid surfactants and micro-/nanomotors. Here we put micro-/nanomotors colloidal particles into hollow polymeric micro-encapsulates. An intelligent polymeric nanocapsule was prepared for enhanced oil recovery by the self-assembly method. The particle size range of the polymeric capsule can be controlled between 20 to 1000 nm by adjusting the cross-linking thickness of the capsule’s outer membrane. The average particle size of polymeric capsules prepared in the study was 300 nm. The structure and properties of the Intelligent polymeric nanocapsule was characterized by a wide range of technics such as Fourier transform infrared spectroscopy, scanning electron microscopy by laser diffraction, fluorescence microscopy, pendant drop tensiometer, laser particle size instrument, and interface tension analyzer. It was found that the intelligent polymeric nanocapsule exhibited significant interfacial activity at the oil-water interface. When the Janus particles’ concentration reached saturation concentration, the adsorption of the amphiphilic nanoparticles at the interface was saturated, and the equilibrium surface tension dropped to around 31 mN/m. When the particles’ concentration reached a critical concentration of aggregation, the Gibbs stability criterion was fulfilled. The intelligent polymeric nanocapsule system has a better plugging and enhanced oil recovery capacity. The results obtained provide fundamental insights into the understanding of the assembly behavior and emulsifying properties of the intelligent polymeric nanocapsule, and further demonstrate the future potential of the intelligent polymeric nanocapsule used as colloid surfactants for enhanced oil recovery applications.

Abstract 399: High Throughput Comprehensive Volumetric Approach for Determination of Particle Number and Composition of Lipoproteins in Normolipidemic and Dyslipidemic Populations

2017 ◽  
Vol 37 (suppl_1) ◽  
Author(s):  
Zsuzsanna Kuklenyik ◽  
John R Barr ◽  
James L Pirkle ◽  
Keyword(s):  
Particle Size ◽  
High Throughput ◽  
Size Range ◽  
Average Particle Size ◽  
Protein Composition ◽  
Average Particle ◽  
Surface Lipid ◽  
Molar Ratios ◽  
Ldl Particles ◽  
Wide Range

Lipoproteins (Lps) are large molecular assembles formed by lipid and apolipoprotein constituents. The physical metric of Lps as metabolically functional entities is particle concentration in serum or plasma (Lp-P). However, the metabolic functions of Lp particles is determined by their lipid/protein composition and structure. To be able to determine both Lp composition and Lp-P, a volumetric approach is required, as demonstrated by Segrest et al and other groups. In this work the volumetric approach was implemented but with applicability to population studies. The workflow included size based separation of Lps by asymmetric flow field-flow fractionation while collecting fractions with 1-1.5 nm increments in the range of 7-15 nm (HDL), 20-30 nm (LDL) and >30 nm Lps (40 fractions in total from 0.1 mL serum aliquots). The average particle size in each fraction was measured by dynamic light scattering. Three high throughput, parallel LC-MS/MS based methods were developed to quantify main non-polar lipids (FC, CE and TG), phospholipids (PC, SM, PE, PI and LPC), and apolipoproteins (apos A-I, A-II, A-IV, B, C-I, C-II, C-III and E). Quantification of particle size and all major Lp components was achieved with 4-15% CVs. Overall accuracy of the methods was demonstrated by ApoB-100/LDL-P molar ratios of 0.7-1.3 (vs. 1 expected) in the 22-26 nm maximum LDL size range. In the 7.5-13 nm size range, ApoA-I/HDL-P was 0.7-3.5 and ApoA-II/HDL-P of 0.5-2.5. Using the calculated Lp-P values, average individual analyte/Lp-P molar ratios were calculated in each fraction. The workflow was applied to 120 patient samples with wide range of Total-C and Total-TG levels. Multivariate response surface modeling was used to show significant correlations among individual lipid/Lp-P and apolipoprotein/Lp-P molar ratios. For example, with correction for particle size, the correlations of apoC-III/Lp-P and FC/Lp-P with SM/Lp-P, PC/Lp-P, TG/Lp-P and CE/Lp-P were determined, showing the effect of surface lipid and core lipid composition on apoC-III and FC binding to HDL and LDL particles, while also revealing significant cross effects among Lp components. By using <0.1 mL serum or plasma, the workflow is applicable to archived samples collected in large cohort studies.

Sintering Kinetics of Hydroxyapatite Prepared by Chemical Coprecipitation Method

2011 ◽  
Vol 233-235 ◽  
pp. 1511-1515 ◽  
Author(s):  
Jian Peng Zou
Keyword(s):  
Particle Size ◽  
Sintering Temperature ◽  
Average Particle Size ◽  
Atomic Emission ◽  
Coprecipitation Method ◽  
Average Particle ◽  
Chemical Coprecipitation ◽  
Particle Size Analyzer ◽  
Controlling Mechanism ◽  
Chemical Coprecipitation Method

With chemical coprecipitation method, high purity hydroxyapatite was successfully prepared in this paper. The microstructure and components of HA were characterized by XRD, SEM, FTIR, atomic emission spectrum and particle size analyzer. The results demonstrate that synthesized HA is very pure and is harmless to human body. Average particle size of HA powder is about 10.4μm. Crystallization degree of hydroxyapatite increases with the increase of sintering temperature and the optimal preparing technique is sintering at 750 for 2h with temperature-rising rate of 5°C·min-1. Grain growing activation energy of HA can be calculated as 24.8 kJ·mol-1 according to the relationship between grain size and sintering temperature. HA’s grain growth mechanism is interfacial diffusion controlling mechanism.

scholarly journals Polysubstituted High-Entropy [LaNd](Cr0.2Mn0.2Fe0.2Co0.2Ni0.2)O3 Perovskites: Correlation of the Electrical and Magnetic Properties

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 1014
Author(s):  
Vladimir E. Zhivulin ◽  
Evgeniy A. Trofimov ◽  
Svetlana A. Gudkova ◽  
Igor Yu. Pashkeev ◽  
Alexander Yu. Punda ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Chemical Composition ◽  
Average Particle Size ◽  
Maximum Size ◽  
Average Particle ◽  
Ferromagnetic Cluster ◽  
High Entropy ◽  
Wide Range ◽  
Field Cooling

La-, Nd- and La/Nd-based polysubstituted high-entropy oxides (HEOs) were produced by solid-state reactions. Composition of the B-site was fixed for all samples (Cr0.2Mn0.2Fe0.2Co0.2Ni0.2) with varying of A-site cation (La, Nd and La0.5Nd0.5). Nominal chemical composition of the HEOs correlates well with initial calculated stoichiometry. All produced samples are single phase with perovskite-like structure. Average particle size is critically dependent on chemical composition. Minimal average particle size (~400 nm) was observed for the La-based sample and maximal average particle size (5.8 μm) was observed for the Nd-based sample. The values of the configurational entropy of mixing for each sample were calculated. Electrical properties were investigated in the wide range of temperatures (150–450 K) and frequencies (10−1–107 Hz). Results are discussed in terms of the variable range hopping and the small polaron hopping mechanisms. Magnetic properties were analyzed from the temperature and field dependences of the specific magnetization. The frustrated state of the spin subsystem was observed, and it can be a result of the increasing entropy state. From the Zero-Field-Cooling and Field-Cooling regimes (ZFC-FC) curves, we determine the <S> average and Smax maximum size of a ferromagnetic nanocluster in a paramagnetic matrix. The <S> average size of a ferromagnetic cluster is ~100 nm (La-CMFCNO) and ~60 nm (LN-CMFCNO). The Smax maximum size is ~210 nm (La-CMFCNO) and ~205 nm (LN-CMFCNO). For Nd-CMFCNO, spin glass state (ferromagnetic cluster lower than 30 nm) was observed due to f-d exchange at low temperatures.

scholarly journals Silver and Copper nano-colloid generation via Pulsed Laser Ablation in Liquid: Recirculation nanoparticle production mode

2021 ◽  
Author(s):  
Sithara Sreenilayam Pavithran ◽  
Ronan McCann ◽  
Éanna McCarthy ◽  
Brian Freeland ◽  
Karsten Fleischer ◽  
...  
Keyword(s):  
Particle Size ◽  
Laser Ablation ◽  
Average Particle Size ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Average Particle ◽  
Laser Ablation In Liquid ◽  
Wide Range ◽  
Ligand Free ◽  
Unique Chemical

Metal nanoparticles have unique chemical, physical, electrical, and optical properties that make them attractive for a wide range of applications in sensing, anti-fouling surfaces, medicine, and conductive inks. Pulsed Laser Ablation in Liquid (PLAL) is a green method of nanoparticle colloid production, capable of producing ligand-free nanoparticles in solution without the need for hazardous, environmentally unfriendly chemicals. Control of the process parameters can give control over the resulting colloid properties such as particle size distribution. In this work, silver (Ag) nanoparticles (NPs) with average particle size from 2.04 to 19.3 nm and copper (Cu) NPs with average particle size from 40 to 85.9 nm were produced by PLAL) technique.

The Influence of Sintering Temperature on Properties of Silicon Carbide Porous Ceramic Filter Membrane

2015 ◽  
Vol 655 ◽  
pp. 32-35
Author(s):  
Chuang Jun Huang ◽  
Xiang Yun Deng ◽  
Yang Shan Sun ◽  
Guang Hao Sun ◽  
Xin Guan
Keyword(s):  
Sintering Temperature ◽  
Raw Materials ◽  
Porous Ceramic ◽  
Average Particle Size ◽  
Ceramic Filter ◽  
Testing System ◽  
Average Particle ◽  
Mass Ratio ◽  
Filter Membrane ◽  
Filtration Membrane

The average particle size of SiC used as raw materials is 60 μm, the filter membrane in a mass ratio of each component are: SiC : binder: sodium carboxymethyl cellulose (CMC): deionized water =9:1:1:20. Method of producing membrane by means of spin coating, the sintering temperature was set in different ranges. The Archimedes drainage method was used to measure its porosity, and the filter pressure of membrane was charactered by the filter pressure testing system, SEM was performed to characterize its surface morphology and microstructure. The results show that: when the temperature rises from 1225 °C to 1325 °C, the filter pressure of SiC porous ceramic filter membrane decrease firstly and then increase; the atlas trend of the porosity is roughly opposite with the filter pressure, the maximum of the porosity value is about 42% when the temperature reaches 1300°C, at this temperature, the filter pressure reaches a minimum value and the surface of the filtration membrane is the most flat. When the temperature reaches 1350 °C, the surface of the film started showing a plaque.

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