Effect of solution pH and ionic strength on the stability of poly(acrylic acid)-encapsulated multiwalled carbon nanotubes aqueous dispersion and its application for NADH sensor

2006 ◽  
Vol 22 (5) ◽  
pp. 694-699 ◽  
Author(s):  
Aihua Liu ◽  
Takashi Watanabe ◽  
Itaru Honma ◽  
Jin Wang ◽  
Haoshen Zhou
Keyword(s):  
Carbon Nanotubes ◽  
Ionic Strength ◽  
Acrylic Acid ◽  
Multiwalled Carbon Nanotubes ◽  
Aqueous Dispersion ◽  
Solution Ph ◽  
Multiwalled Carbon ◽  
The Stability ◽  
Poly Acrylic Acid

Covalent Functionalization of Multiwalled Carbon Nanotubes with Poly(acrylic acid)

2006 ◽  
Vol 24 (4) ◽  
pp. 563-568 ◽  
Author(s):  
Yan-Xin Liu ◽  
Zhong-Jie Du ◽  
Yan Li ◽  
Chen Zhang ◽  
Hang-Quan Li
Keyword(s):  
Carbon Nanotubes ◽  
Acrylic Acid ◽  
Multiwalled Carbon Nanotubes ◽  
Covalent Functionalization ◽  
Multiwalled Carbon ◽  
Poly Acrylic Acid

scholarly journals Effect of Size of Multiwalled Carbon Nanotubes Dispersed in Gear Oils for Improvement of Tribological Properties

2018 ◽  
Vol 2018 ◽  
pp. 1-13 ◽  
Author(s):  
Kodanda Rama Rao Chebattina ◽  
V. Srinivas ◽  
N. Mohan Rao
Keyword(s):  
Carbon Nanotubes ◽  
Raman Spectroscopy ◽  
Ball Milling ◽  
Multiwalled Carbon Nanotubes ◽  
Tribological Properties ◽  
Extreme Pressure ◽  
Multiwalled Carbon ◽  
Pristine Mwcnts ◽  
Gear Oil ◽  
The Stability

The aim of the paper is to investigate the effect of size of multiwalled carbon nanotubes (MWCNTs) as additives for dispersion in gear oil to improve the tribological properties. Since long pristine MWCNTs tend to form clusters compromising dispersion stability, they are mildly processed in a ball mill to shorten the length and stabilized with a surfactant before dispersing in lubricant. Investigations are made to assess the effect of ball milling on the size and structure of MWCNTs using electron microscopy and Raman spectroscopy. The long and shortened MWCNTs are dispersed in EP 140 gear oil in 0.5% weight. The stability of the dispersed multiwalled carbon nanotubes is evaluated using light scattering techniques. The antiwear, antifriction, and extreme pressure properties of test oils are evaluated on a four-ball wear tester. It is found that ball milling of MWCNTs has a strong effect on the stability and tribological properties of the lubricant. From Raman spectroscopy, it is found that ball milling time of up to 10 hours did not produce any defects on the surface of MWCNTs. The stability of the lubricant and the antiwear, antifriction, and extreme pressure properties have improved significantly with dispersion shortened MWCNTs. Ball milling for longer periods produces defects on the surface of MWCNTs reducing their advantage as oil additives.

Adsorption of 60Co from aqueous solution onto alginate–acrylic acid–vinylsulfonic acid/multiwalled carbon nanotubes composite

2019 ◽  
Vol 77 (9) ◽  
pp. 4631-4653
Author(s):  
Islam Mohamed Abdelmonem ◽  
Essam Metwally ◽  
Tharwat Essa Siyam ◽  
Farid Abou El-Nour ◽  
Abdel-Rahman Mahmoud Mousa
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Acrylic Acid ◽  
Multiwalled Carbon Nanotubes ◽  
Multiwalled Carbon

scholarly journals Effects Of Environmental Factors On The Dispersion Behavior Of Iron Oxide In Aqueous Solutions With Poly Acrylic Acid

2015 ◽  
Vol 60 (2) ◽  
pp. 1561-1564
Author(s):  
E.-H. Lee ◽  
K.-M. Kim ◽  
W.-Y. Maeng ◽  
D.-H. Hur
Keyword(s):  
Molecular Weight ◽  
Acrylic Acid ◽  
High Molecular Weight ◽  
Low Molecular Weight ◽  
Solution Ph ◽  
Molecular Weights ◽  
Aqueous Suspensions ◽  
Magnetite Particles ◽  
The Stability ◽  
Poly Acrylic Acid

Abstract After preparing aqueous suspensions from magnetite particles with a poly-acrylic acid, we investigated the effects of several experimental parameters. We characterized the stability of the suspensions using visual inspection, sedimentation, adsorption, and thermal stability of the dispersant. The dispersion stability is affected by the solution pH, the concentrations of magnetite particles, the molecular weight, the concentration of the dispersants, and the temperature. The stability of the suspensions increased as the concentration of the dispersant and the temperature increased. In terms of the molecular weights of the dispersant, the suspensions with dispersant of low-molecular weight (1800) were more stable than those of high-molecular weight (250000) at room temperature. However, at high temperature the suspensions with high-molecular weight showed stability. The adsorption efficiency of the dispersant was very low. The dispersant of high-molecular weight showed a higher thermal integrity than that of low-molecular weight. From this work, we obtained the optimum conditions for stable aqueous suspensions of magnetite particles.

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