scholarly journals The Effects of the Acid Treatment of ZrB2 Particles on Their Purity and Aqueous Dispersibility

Processes ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 18 ◽  
Author(s):  
Jinuk Choi ◽  
Gye Seok An
Keyword(s):  
Aqueous Solution ◽  
Surface Properties ◽  
Oxygen Content ◽  
Hydrofluoric Acid ◽  
Acid Treatment ◽  
Zirconium Diboride ◽  
Acid Type ◽  
Aqueous Dispersibility ◽  
Acid Treatments

Oxide impurities such as boria (B2O3) and zirconia (ZrO2) on the surfaces of zirconium diboride (ZrB2) particles are known to limit their sinterability. Among the impurities, B2O3 on the surface of ZrB2 particles could be easily removed by methanol or hydrofluoric acid. However, the remaining ZrO2 still gave negative influences on the sinterability. In this study, ZrB2 particles were treated with various acids to remove oxide impurities on their surfaces. The acid treatments were found to vary in efficacy, according to acid type, and affect the crystallinity and morphology of ZrB2 particles to varying degrees, in some cases forming additional impurities. In particular, the change in the oxygen content of the ZrB2 particles induced by acid treatment was found to depend on the type of acid. The results of the acid treatments were compared which revealed that HNO3 treatment optimizes the purity of ZrB2 particles. In addition, the effects of acid treatment on the surface properties of ZrB2 particles were considered. In particular, the correlation between the surface properties of the acid-treated ZrB2 particles and their dispersibility in aqueous solution was investigated.

Effects of phosphoric acid treatment of titanium surfaces on surface properties, osteoblast response and removal of torque forces

2010 ◽  
Vol 6 (4) ◽  
pp. 1661-1670 ◽  
Author(s):  
Jin-Woo Park ◽  
Youn-Jeong Kim ◽  
Je-Hee Jang ◽  
Tae-Geon Kwon ◽  
Yong-Chul Bae ◽  
...  
Keyword(s):  
Phosphoric Acid ◽  
Surface Properties ◽  
Acid Treatment ◽  
Titanium Surfaces

Effects of Surface Properties and Solvent PH Values on the Adsorption/Desorption Abilities of Mesoporous SBA-15 to Methylene Blue Molecules

2012 ◽  
Vol 518-523 ◽  
pp. 352-355
Author(s):  
Hui Liu ◽  
Hong Liang Li ◽  
Meng Xue Wang ◽  
Jing Jing Sang ◽  
Xiu Song Zhao
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Pore Size Distribution ◽  
Pore Size ◽  
Surface Properties ◽  
Weak Base ◽  
Adsorption Ability ◽  
Ph Values ◽  
Model Molecule ◽  
Adsorption Desorption

Methylene blue (MB) was used as model molecule to investigate the effects of surface properties and solvent pH values on the adsorption and desorption (or release) behaviors of mesoporous SBA-15 materials. It was found that the treatment of SBA-15 with a pH 7.8 aqueous solution can enhance the adsorption rate and capacity in comparison with the pristine SBA-15. The effect of pH values on MB releasing from the weak base treated SBA-15 and the pristine one have been studied and been compared in pH values range from 0.5 to 7.0. Both of them showed a maximum releasing rate at about pH 2 and all of the treated SBA-15 samples showed a higher releasing quantity than the pristine ones. The influence mechanisms of base treatment on the adsorption ability and that of pH values on the releasing properties of SBA-15 samples have been analyzed and been discussed based on the composition, the morphology, the surface area and pore size distribution and adsorption/desorption measurements.

Atomic Structure of Hydrogen-Terminated Si(111) Surfaces by Hydrofluoric Acid Treatments

1991 ◽  
Vol 30 (Part 1, No. 12B) ◽  
pp. 3570-3574 ◽  
Author(s):  
Yukinori Morita ◽  
Kazushi Miki ◽  
Hiroshi Tokumoto
Keyword(s):  
Atomic Structure ◽  
Hydrofluoric Acid ◽  
Acid Treatments

Efficient removal of heavy metal ions from aqueous solution using salicylic acid type chelate adsorbent

2011 ◽  
Vol 192 (3) ◽  
pp. 956-962 ◽  
Author(s):  
Fuqiang An ◽  
Baojiao Gao ◽  
Xin Dai ◽  
Min Wang ◽  
Xiaohua Wang
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Salicylic Acid ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Efficient Removal ◽  
Acid Type

scholarly journals Effect of Temperature on the Surface Properties of Aqueous Solution of Arachidonic Acid.

1993 ◽  
Vol 41 (1) ◽  
pp. 6-11 ◽  
Author(s):  
Shoko YOKOYAMA ◽  
Junko OBATA ◽  
Tadao JUJIE ◽  
Masayuki NAKAGAKI
Keyword(s):  
Aqueous Solution ◽  
Arachidonic Acid ◽  
Surface Properties ◽  
Effect Of Temperature

Measuring organic carbon in Calcarosols: understanding the pitfalls and complications

Soil Research ◽  
2012 ◽  
Vol 50 (5) ◽  
pp. 397 ◽  
Author(s):  
Aaron Schmidt ◽  
Ronald J. Smernik ◽  
Therese M. McBeath
Keyword(s):  
Organic Carbon ◽  
Hydrofluoric Acid ◽  
Acid Treatment ◽  
Calcareous Soils ◽  
Soil Condition ◽  
Wet Oxidation ◽  
Sulfurous Acid ◽  
The Difference ◽  
Pre Treatment ◽  
Dry Combustion

The measurement of soil organic carbon (OC) is important for assessing soil condition and improving land management systems, as OC has an important role in the physical, chemical, and biological fertility of soil. The OC contents of Calcarosols often appear high compared with other Australian soil types with similar fertility. This may indicate either systematic overestimation of OC in Calcarosols or the existence of a mechanism of OC stabilisation specific to carbonate-rich soils. This study compares three dry combustion techniques (dry combustion with correction for carbonate-C determined separately, dry combustion following sulfurous acid treatment, and dry combustion following treatment with hydrofluoric acid) and two wet oxidation techniques (Walkley–Black and Heanes) for the measurement of soil OC content, to determine which method is best for Calcarosols. Nine calcareous and nine non-calcareous soils were analysed. Of the methods, dry combustion with carbonate-C correction and dry combustion following sulfurous acid pre-treatment were found to be unsuitable for highly calcareous soils. Dry combustion with carbonate-C correction was unsuccessful primarily due to incomplete conversion of carbonate to CO2 under the combustion conditions used. However, even if this problem could be overcome, the method would still not be suitable for highly calcareous soils since it would involve the measurement of a relatively small value (OC) as the difference of two much larger values (total C and carbonate-C). Sulfurous acid pre-treatment was unsuitable because it did not remove 100% of carbonate present. Although the remaining dry combustion technique (i.e. following hydrofluoric acid treatment) did not have such problems, it did give very different (and much lower) OC estimations than the two wet oxidation techniques for the highly calcareous soils. These results are consistent with carbonate minerals interacting with and stabilising a substantial quantity of soluble OC. This has implications for the way OC levels should be measured and interpreted in Calcarosols, in terms of both fertility and C stabilisation and sequestration.

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