Effects of Different Sodic Deflocculants on Rheological Properties of Acid-Resistant Overglaze Slip

2013 ◽  
Vol 668 ◽  
pp. 178-182 ◽  
Author(s):  
Cong Li ◽  
Qi Cheng Liu ◽  
An Ming Chen ◽  
Jun Feng ◽  
Tao Feng
Keyword(s):  
Zeta Potential ◽  
Rheological Properties ◽  
Focal Spot ◽  
Sodium Tripolyphosphate ◽  
Ring Test ◽  
Single Factor ◽  
The Poor ◽  
Better Than

This paper aims at solving the poor rheology of clay-water- acid-resistant overglaze slip. Natronite, tripolyphosphate sodium and composite deflocculant compounded of sodium natronite and sodium tripolyphosphate in proportion of 1:2 respectively were taken as deflocculants, and single-factor test and ring test were used to measure the variations in zeta-potential, viscosity and thixotropic. The results show that 0.3% of the composite deflocculants are better than any other single deflocculants on clay-water-acid-resistant overglaze slip, which has a better liquidity, a better thixotropy and a better stability that can avoid defects on glaze such as crawling, pinhole, hard spot, focal spot. Some factual and theoretic bases can be provided for enamel industry.

Utilization of a Phosphate Ester as a Dispersant for SiAlON Based Ceramics

2007 ◽  
Vol 554 ◽  
pp. 71-77 ◽  
Author(s):  
A. Ceylan ◽  
E. Suvaci ◽  
Hasan Mandal
Keyword(s):  
Zeta Potential ◽  
Rheological Properties ◽  
Powder Mixture ◽  
Sodium Tripolyphosphate ◽  
Phosphate Ester ◽  
Aqueous Dispersions ◽  
Aqueous Suspensions ◽  
Dispersion Behavior

Aqueous dispersions of SiAlON forming powders (Si3N4, AlN and Y2O3) were obtained. Dispersibility of powders was found to be improved by addition of sodium tripolyphosphate. Stable aqueous suspensions of SiAlON forming powders were prepared by using a phosphate ester, sodium tripolyphosphate (STPP, Na5P3O10). Effect of the STPP on rheological properties of the powder mixture was investigated by zeta potential measurements, sedimentation and milling studies. It has been shown that addition of the STPP to the aqueous SiAlON forming powder mixture improves the dispersion behavior significantly. These results suggest that STPP can be utilized as a dispersant in such ceramic systems.

scholarly journals Use of Multi-Anionic Sodium Tripolyphosphate to Enhance Dispersion of Concentrated Kaolin Slurries in Seawater

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1085
Author(s):  
Williams Leiva ◽  
Norman Toro ◽  
Pedro Robles ◽  
Edelmira Gálvez ◽  
Ricardo Ivan Jeldres
Keyword(s):  
Rheological Properties ◽  
Fine Particles ◽  
Sodium Tripolyphosphate ◽  
Mining Industry ◽  
Chord Length ◽  
Water Recovery ◽  
Reflectance Measurement ◽  
Anionic Charge ◽  
Free Environment ◽  
The Impact

This research aims to analyze the impact of sodium tripolyphosphate (STPP) as a rheological modifier of concentrated kaolin slurries in seawater at pH 8, which is characteristic of copper sulfide processing operations. The dispersion phenomenon was analyzed through chord length measurements using the focused beam reflectance measurement (FBRM) technique, complementing size distributions in unweighted and square-weighted modes. The reduction of the rheological properties was significant, decreasing from 231 Pa in a reagent-free environment to 80 Pa after the application of STPP. A frequency sweep in a linear viscoelastic regime indicated that by applying a characteristic dosage of 0.53 kg/t of STPP, the pulp before yielding increases its phase angle, which increases its liquid-like character. Measurements of the chord length verified the dispersion of particles, which showed an apparent increase in the proportion of fine particles and a reduction of the coarser aggregates when STPP was applied. Measurements of the zeta potential suggested that the high anionic charge of the reagent (pentavalent) increases the electrostatic repulsions between particles, overcoming the effect of cations in seawater. The results are relevant for the mining industry, especially when the deposits have high contents of complex gangues, such as clays, that increase the rheological properties. This increases the energy costs and water consumption needed for pumping the tailings from thickeners to the tailing storages facilities. The strategies that allow for the improvement of the fluidity and deformation of the tailings generate slack in order to maximize water recovery in the thickening stages.

Electrokinetic Research on the Dispersion Behavior of Nano-Ceria Particles in Concentrated Suspensions

2015 ◽  
Vol 645-646 ◽  
pp. 394-399
Author(s):  
Wei Gao ◽  
Qi Long Wei ◽  
Ling Ding ◽  
Xiao Yuan Li ◽  
Chao Wang ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Rheological Properties ◽  
Concentrated Suspensions ◽  
Tem Analysis ◽  
Concentrated Suspension ◽  
Original Solution ◽  
Multi Scale ◽  
Scale Method ◽  
Dispersion Behavior ◽  
Significant Difference

A multi-scale method was developed, which utilized intrinsic relationships among zeta potential of particles, rheological properties of suspensions and particle size distribution (PSD), to analyze dispersion behavior of nanoparticles in concentrated suspensions. It was found that PSD of a kind of nanoceria particles by dynamic light scattering (DLS) method in solution A with concentration 5 wt% accorded well with that by direct TEM analysis, which meant the particles had been dispersed well. However, there had a significant difference when the concentration was increased to 20 wt%. When particles concentration increased from 5 wt% to 20 wt%, zeta potential in solution A changed from-150 mV to-100 mV, while zeta potential in solution B changed from-35mV to-45 mV. Variations of zeta potential of particles accorded well with rheological properties of suspensions too, from phenomenological models. When the suspensions composed by solution A and the nanoparticles with concentration about 20 wt% was diluted with its original solution to 5 wt%, the PSD of nanoceria could be measured indirectly, which accorded well with both that of a suspension prepared directly with near concentration and that from TEM images. Then a method to measure PSD of nanoparticles in concentrated suspension was brought forward.

scholarly journals In-Vitro Activity of Nano Fluconazole and Conventional Flucon-azole against Clinically Important Dermatophytes

2020 ◽  
Author(s):  
Najmossadat MUSAVI BAFRUI ◽  
Seyed Jamal HASHEMI HAZAVEH ◽  
Mansour BAYAT
Keyword(s):  
Zeta Potential ◽  
Fungal Infections ◽  
Antifungal Susceptibility ◽  
Nano Particles ◽  
Medical Sciences ◽  
Particle Structure ◽  
Epidermophyton Floccosum ◽  
Dermatophyte Species ◽  
Better Than

Background: Dermatophytosis is one of the most common fungal infections in humans. Antifungals such as fluconazole are effectively used for treating dermatophytosis; however, drug resistance was observed in many cases. Therefore, a newer treatment strategy is essential. Methods: This study (Conducted in the Laboratory of the School of Public Health, Tehran University of Medical Sciences, Tehran, Iran in 2018) evaluated the antifungal susceptibility of nano fluconazole compared to conventional fluconazole on dermatophyte isolates using CLSI M38-A2guidelines. Dermatophyte species isolated from clinical cases of dermatophytosis were identified using PCR sequencing techniques. Zeta potential and size of the nano particles containing fluconazole were measured; scanning electron microscope (SEM) was used to determine nano particle structure. Results: The size of liposomal fluconazole obtained was 88.9  12.14 nm with –20.12  3.8 mV for zeta potential. The encapsulation rate for fluconazole was 75.1  4.2%. MIC50 for the three tested species was 32, 16, and 8 μg/ml for Trichophyton interdigitale, T. rubrum, and Epidermophyton floccosum isolates, respectively. The corresponding values for nano fluconazole were 8 μg/ml for the three tested species. Conclusion: MIC value for nano-fluconazole was lower than conventional fluconazole in all dermatophytes species tested; therefore, nano-fluconazole could inhibit the growth of dermatophytes better than fluconazole at a lower concentration of the drug.

scholarly journals PENGARUH IMPLEMENTASI ASESMEN OTENTIK DALAM PEMBELAJARAN TERHADAP HASIL BELAJAR GAMBAR TEKNIK DENGAN PENGENDALIAN BAKAT MEKANIK DI KELAS X TKRO SMK NEGERI 3 SINGARAJA

2019 ◽  
Vol 9 (2) ◽  
pp. 58-69
Author(s):  
Gede Aprianto ◽  
I Made Candiasa ◽  
I Made Gita
Keyword(s):  
Performance Assessment ◽  
Random Sampling ◽  
Sampling Technique ◽  
Authentic Assessment ◽  
Single Factor ◽  
Learning Achievement ◽  
Project Assessment ◽  
Technical Drawing ◽  
Quasi Experimental ◽  
Better Than

AbstrakTujuan utama penelitian ini adalah untuk mengetahui pengaruh implementasi asesmen otentik yang terdiri dari asesmen proyek dan asesmen kinerja terhadap hasil belajar gambar teknik dengan pengendalian bakat mekanik yang dilakukan di kelas X TKRO SMK Negeri 3 Singaraja. Penelitian ini merupakan jenis quasi experiment dengan rancangan single factor independent groups design with use covariate. Sampel penelitian berjumlah 70 orang siswa yang diambil menggunakan teknik random sampling. Pengumpulan data dilakukan dengan metode tes obyektif dan uraian. Hipotesis pada penelitian ini diuji dengan Anakova satu jalur. Hasil penelitian menunjukkan bahwa : Pertama, hasil belajar gambar teknik siswa yang diberi penerapan asesmen proyek lebih baik daripada siswa yang diberi penerapan asesmen kinerja (thit = 2,303; p ≤ 0,05). Kedua, setelah dilakukan pengendalian terhadap bakat mekanik, hasil belajar gambar teknik siswa yang diberi penerapan asesmen proyek lebih baik daripada hasil belajar siswa yang diberi penerapan asesmen kinerja (Fhit = 49,204; p ≤ 0,05). Ketiga, terdapat kontribusi bakat mekanik (86,2%) terhadap hasil belajar gambar teknik (R = 0,929; thit = 20,620; p ≤ 0,05). Atas temuan tersebut, disimpulkan bahwa asesmen proyek dan bakat mekanik mempunyai pengaruh terhadap hasil belajar gambar teknik pada siswa kelas X TKRO SMK Negeri 3 Singaraja. Kata kunci: asesmen otentik, hasil belajar gambar teknik, bakat mekanik AbstractThe main objective of this study was to determine the effect of authentic assessment implementation consisting of project assessment and performance assessment towards the technical drawing learning achievement by controlling mechanical talent in X TKRO class at SMK Negeri 3 Singaraja. The study employed a quasi-experimental type with a single factor design independent groups design with use covariate. There were 70 students as the samples of the study that determined by random sampling technique. The data were obtained through objective test and essay method. The hypothesis in this study was tested by a one-way Ancova. The results showed that: a) the technical drawing learning achievement of the students that applied project assessment were better than the learning achievement of students who were applied performance assessment (thit= 2.303; p ≤ 0.05), b) after controlling for mechanical talent, the technical drawing learning achievement of the students applied project assessment were better than the students who applied performance assessment (Fhit = 49.204; p ≤ 0.05), c) there was a contribution of mechanical talent (86.2%) to the technical drawing learning achievement (R = 0.929; thit = 20.620; p ≤ 0.05). Based on these findings, it was concluded that project assessment and mechanical talent had an influence on the technical drawing learning achievement of X TKRO class at SMK Negeri 3 Singaraja. Keywords: authentic assessment, technical drawing learning achievement, mechanical talent

scholarly journals Tribological Performance of CF‐PEEK Sliding Against 17‐4PH Stainless Steel with Various Cermet Coatings for Water Hydraulic Piston Pump Application

Coatings ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 436 ◽  
Author(s):  
Nie ◽  
Lou ◽  
Ji ◽  
Yin
Keyword(s):  
Stainless Steel ◽  
Test Bench ◽  
Ring Test ◽  
High Rotational Speed ◽  
Cermet Coatings ◽  
Tribological Behaviors ◽  
Peek Composite ◽  
Water Hydraulic ◽  
Resistance Performance ◽  
Better Than

To improve the abrasion resistance performance of the critical tribopairs within water hydraulic piston pumps, tribological characteristics of the stainless steel 17‐4PH and 17‐4PH coated with Cr3C2‐NiCr, WC‐10Co‐4Cr, Cr2O3 and Al2O3‐13%TiO2 sliding against carbon fiber reinforced polyetheretherketone (CF‐PEEK) composite under water‐lubricated condition were experimentally studied using a pin‐on‐ring test bench with different working conditions. It has been demonstrated by the experimental results that the tribological behaviors of CF‐PEEK/cermet coatings tribipairs were better than that of CF‐PEEK/17‐4PH tribopair under water lubrication. However, the Cr3C2‐NiCr coating could be damaged under high rotational speed. Due to the reaction film produced by the Al2O3‐13%TiO2 and water, the CF‐PEEK/Al2O3‐13%TiO2 material combination exhibits more excellent tribological behaviors than other tribopairs lubricated with water, and could preferentially be used in water hydraulic piston pumps.

scholarly journals Research on the coagulant aid effects of modified diatomite on coal microbial flocculation

2019 ◽  
Vol 80 (10) ◽  
pp. 1893-1901
Author(s):  
Dong Jingshen ◽  
Liu Quanjun
Keyword(s):  
Zeta Potential ◽  
Good Effect ◽  
Coal Slurry ◽  
Single Factor ◽  
Flocculation Mechanism ◽  
Microbial Flocculant ◽  
Flocculation Effect ◽  
Chitosan Molecule ◽  
Modified Diatomite ◽  
Microbial Flocculation

Abstract Diatomite was modified by chitosan to prepare modified diatomite, and the modified diatomite in an optimized ratio was utilized in coal bio-flocculation. The interaction behavior and flocculation mechanism of modified diatomite on coal slurry water were investigated by single factor experiments, infrared spectroscopy, Brunauer-Emmett-Teller (BET) measurements, and zeta potential measurements. The single factor experiments showed that when the amount of microbial flocculant added was 1.5 ml, the temperature of coal slurry water was 39 °C, the pH was 5, and the amount of modified diatomite was 0.2 g, after 30 min of sedimentation, the flocculation transmittance of the coal slurry water reached 84.3%. The infrared spectra showed that the -NH2 and -OH of the chitosan molecule had a polar interaction with the Si-OH bond in diatomite. The BET measurements showed that the specific surface area of diatomite was not a decisive factor affecting the flocculation effect. Zeta potential measurements indicated that the amino protonation of chitosan increased the isoelectric point (IEP) of modified diatomite. These results showed that modified diatomite has a good effect on coal bio-flocculation.

Analysis the Influence of Non-Prestressed Reinforcement for Horizontal Bearing Capacity of PHC Pipe Pile

2014 ◽  
Vol 919-921 ◽  
pp. 649-653
Author(s):  
Pei Sheng Xi ◽  
Xiao Kai Sun
Keyword(s):  
Bearing Capacity ◽  
Poor Performance ◽  
Analysis Software ◽  
Element Analysis ◽  
Prestressing Steel ◽  
Concrete Piles ◽  
The Poor ◽  
Concrete Pile ◽  
Prestressed Reinforcement ◽  
Better Than

We analyze the configuration of the non-pretressed reinforcement impact on the level of bearing capacity of PHC piles to effectively solve the poor performance of the general bending of pretressed concrete pile,using ANSYS finite element analysis software,through configurating the pretressed concrete pile with appropriate amount of ordinary non-presressed reinforcement.The results of numerical calculation show that the performance of PHC pile bending has been greatly improved and the deflection and bending when cracking were significantly better than ordinary PHC pile with the confiuration of non-prestressed reinforcement. We also analyze the effect of non-prestressed reinforcement and prestressing steel when the concrete piles cracking,datd shows that prestressing steel reached stress yielding firstly.The results provide a theoretical basis of the application of precast piles in the foudation ditch support project.

scholarly journals Apathy and Depression: Separate Factors in Parkinson's Disease

2011 ◽  
Vol 17 (6) ◽  
pp. 1058-1066 ◽  
Author(s):  
Lindsey Kirsch-Darrow ◽  
Michael Marsiske ◽  
Michael S. Okun ◽  
Russell Bauer ◽  
Dawn Bowers
Keyword(s):  
Beck Depression Inventory ◽  
Factor Model ◽  
Treatment Options ◽  
Somatic Complaints ◽  
Differential Treatment ◽  
Single Factor ◽  
Nested Models ◽  
Confirmatory Factor ◽  
Dysphoric Mood ◽  
Better Than

AbstractThe objective of this study was to test the hypothesis that apathy and depression are dissociable in Parkinson disease (PD) by conducting a confirmatory factor analysis (CFA) of items from two commonly used mood scales. A total of 161 non-demented PD patients (age = 64.1; ± 8.4 years) were administered the Apathy Scale and the Beck Depression Inventory-II. Items were hypothesized to load onto four factors: (1) an apathy factor representing loss of motivation, (2) dysphoric mood factor representing sadness and negativity, (3) loss of interest/pleasure factor representing the features common to both apathy and depression, and (4) a somatic factor representing bodily complaints. Results indicated a good fit for the overall CFA model, χ2 (128, N = 146) = 194.9; p<.01. RMSEA was .060 (p = .16). The four-factor model was significantly better than all alternative nested models at p < .001, including an overarching single factor model, representing “depression.” Results support the concept that apathy and depression are discrete constructs. We suggest a “factor based” scoring of the Apathy Scale and Beck Depression Inventory-II that disentangles symptoms related to apathy, depression, overlapping symptoms, and somatic complaints. Such scoring may be important in providing useful information regarding differential treatment options. (JINS, 2011, 17, 1058–1066)

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