Synthesis and Tribological Properties of Stearic Acid-Modified Anatase (TiO2) Nanoparticles

2010 ◽  
Vol 41 (2) ◽  
pp. 409-416 ◽  
Author(s):  
Ling Zhang ◽  
Lei Chen ◽  
Hongqi Wan ◽  
Jianmin Chen ◽  
Huidi Zhou
Keyword(s):  
Stearic Acid ◽  
Tio2 Nanoparticles ◽  
Tribological Properties ◽  
Anatase Tio2

Preparation and tribological properties of stearic acid-modified hierarchical anatase TiO2 microcrystals

2012 ◽  
Vol 258 (7) ◽  
pp. 2778-2782 ◽  
Author(s):  
Jianhua Qian ◽  
Xiangyu Yin ◽  
Ning Wang ◽  
Lin Liu ◽  
Jinjuan Xing
Keyword(s):  
Stearic Acid ◽  
Tribological Properties ◽  
Anatase Tio2

Tribological study of TiO2 nanoparticles modified with stearic acid as additives in lithium grease

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Hong Zhang ◽  
Sheng Han ◽  
Wenjing Hu ◽  
Jiusheng Li
Keyword(s):  
Surface Modification ◽  
Electron Microscope ◽  
Stearic Acid ◽  
Metal Nanoparticles ◽  
Tio2 Nanoparticles ◽  
Tribological Properties ◽  
Lithium Grease ◽  
Content Type ◽  
Prepared Nanoparticles ◽  
Steel Balls

Purpose The purpose of this paper is to improve the properties of metal nanoparticles which are easy to agglomerate and hard to disperse evenly, thus limiting the application of metal nanoparticles in grease. A novel technology was proposed for modifying metal oxide to improve the dispersibility of nanoparticles. Design/methodology/approach SA-TiO2 nanoparticles were synthesized using an in-situ esterification method followed by surface modification with stearic acid. The microstructure of the nanoparticles was characterized by scanning electron microscope, transmission electron microscope and Fourier transform infrared spectroscopy and their thermal stability was evaluated by thermogravimetric analyzer. The tribological properties of the SA-TiO2 nanoparticles as additives in lithium grease were evaluated with a four-ball tester and TE77 reciprocating friction tester. The worn surfaces of the steel balls were investigated by EDS and XPS. Findings The prepared nanoparticles can be well dispersed in the lithium grease and possess much better tribological properties compared to traditional nanoparticles. The results indicated that the excellent tribological performance of SA-TiO2 was attributed to the chemical reaction film composing of Fe2O3, iron oxide and other organic compounds. Originality/value This paper provides a method to prevent the agglomeration of nano-TiO2 by surface modification with stearic acid. And the prepared nanoparticles can effectively improve the tribology performance of lithium grease.

scholarly journals Green synthesis of mesoporous anatase TiO2 nanoparticles and their photocatalytic activities

RSC Advances ◽  
2017 ◽  
Vol 7 (76) ◽  
pp. 48083-48094 ◽  
Author(s):  
Sunderishwary S. Muniandy ◽  
Noor Haida Mohd Kaus ◽  
Zhong-Tao Jiang ◽  
Mohammednoor Altarawneh ◽  
Hooi Ling Lee
Keyword(s):  
Low Temperature ◽  
Green Chemistry ◽  
Visible Light ◽  
Green Synthesis ◽  
Tio2 Nanoparticles ◽  
Soluble Starch ◽  
Anatase Tio2 ◽  
Photocatalytic Activities ◽  
Visible Light Active

Mesoporous anatase TiO2 nanoparticles are produced by employing a facile green chemistry approach at low temperature with soluble starch as the template in this work. The obtained TiO2 photocatalyst is visible-light active with good photocatalytic activities.

TiO2 Nanotubes Transformation Into 4nm Anatase Nanoparticles

2021 ◽  
pp. 810-830
Author(s):  
Celeste Yunueth Torres López ◽  
Jose de Jesus Perez Bueno ◽  
Ildefonso Zamudio Torres ◽  
Maria Luisa Mendoza López ◽  
Abel Hurtado Macias ◽  
...  
Keyword(s):  
Tio2 Nanoparticles ◽  
Organic Contaminants ◽  
Tio2 Nanotubes ◽  
Anatase Tio2 ◽  
Organic Media ◽  
Final State ◽  
Active Electrode ◽  
Anatase Nanoparticles ◽  
Modified Layer ◽  
Experimental Findings

The scope of this work shows novel experimental findings on preparing anatase TiO2 nanoparticles, first anodizing titanium into an organic media for obtaining TiO2 nanotubes, and using these as a photocatalytic active electrode in treating water polluted with organic contaminants. The substrates were grit blasted to obtain mechanical fixation of the generated nanotubular TiO2 structure. This was successfully achieved without diminishment of the nanotubes order and with a self-leveling of the outer surface. A new phenomenon has been investigated consisting of the process of oxidation of the nanotubes in water after anodizing. Along this process, methyl orange added to the aqueous solution was discolored as part of the redox reaction involved. The final state of the modified layer was composed of conglomerates of almost completely crystalline TiO2 nanoparticles, around 4 nm in size, consisting of anatase. SEM and TEM images show the transition of the amorphous nanotubes (atomic disorder/nanometric order) to crystalline disordered particles (atomic order/nanometric disorder).

scholarly journals First-Principles Modeling of Oxygen-Deficient Anatase TiO2 Nanoparticles

2020 ◽  
Vol 124 (43) ◽  
pp. 23637-23647
Author(s):  
James. A. Quirk ◽  
Vlado K. Lazarov ◽  
Keith P. McKenna
Keyword(s):  
Tio2 Nanoparticles ◽  
First Principles ◽  
Anatase Tio2
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