Engineered Inorganic/Organic-Core/Shell Magnetic FexOy Nanoparticles with Oleic Acid and/or Oleylamine As Capping Agents

2015 ◽  
Vol 21 (37) ◽  
pp. 5369-5388 ◽  
Author(s):  
Richard Harris ◽  
Hendriëtte van der Walt ◽  
Poslet Shumbula
Keyword(s):  
Oleic Acid ◽  
Core Shell ◽  
Capping Agents

Impact of the capping agent removal from Au NPs@MOF core-shell nanoparticles heterogeneous catalysts

2022 ◽  
Author(s):  
Shan Dai ◽  
Kieu Phung Ngoc ◽  
Laurence Grimaud ◽  
Sanjun Zhang ◽  
Antoine Tissot ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Heterogeneous Catalysts ◽  
Synergistic Effects ◽  
Core Shell ◽  
Capping Agent ◽  
Shell Nanoparticles ◽  
Au Nps ◽  
Capping Agents ◽  
Core Shell Nanoparticles

Metal nanoparticles encased in a MOF shell have shown remarkable properties in catalysis due to potential synergistic effects. However, capping agents, commonly used to prepare these nanoparticles, lower their reactivity...

Synthesis, characterization and tribological behavior of oleic acid-capped core-shell lanthanum borate-SiO2 composites

2014 ◽  
Vol 66 (1) ◽  
pp. 1-8 ◽  
Author(s):  
Zhengfeng Jia ◽  
Yan-qiu Xia ◽  
Xin Shao ◽  
San-ming Du
Keyword(s):  
Oleic Acid ◽  
Tribological Properties ◽  
Friction And Wear ◽  
Thermo Gravimetric Analysis ◽  
Core Shell ◽  
Gravimetric Analysis ◽  
Content Type ◽  
Aisi 1045 Steel ◽  
Aisi 1045 ◽  
1045 Steel

Purpose – The purpose of this paper is to investigate the tribological properties of poly-alpha-olefin (PAO) with nano/microstructure core-shell lanthanum borate-SiO2 composites (OCLS). Design/methodology/approach – Oleic acid-capped core-shell lanthanum borate-SiO2 composites were synthesized by an easy way. The composites were characterized by means of Fourier transform-infrared spectroscopy (FT-IR), transmission electron microscopy (TEM) and thermo gravimetric analysis (TGA). The friction and wear behaviors of the quenched AISI 1045 steel specimens sliding against AISI 52100 steel under the lubrication of PAO containing OCLS were comparatively investigated with PAO containing SiO2 additive on an Optimol SRV reciprocating friction and wear tester. On the other hand, the tribological properties of the PAO containing OCLS were also investigated on four-ball tester. Findings – The diameter of OCLS was about 20 nm, and the thickness of the SiO2 shell was less than 5 nm. The ratio of oleic acid (OA) is about 15 percent. The PAO containing OCLS possesses much better tribological properties than that of pure PAO and PAO containing SiO2 additive. Originality/value – The PAO+OCLS possess a better friction reducing and antiwear properties than pure PAO. The new additive can improve the tribological ability of machinery.

Products and Mechanisms of Ozone Reactions with Oleic Acid for Aerosol Particles Having Core−Shell Morphologies

2004 ◽  
Vol 108 (32) ◽  
pp. 6686-6695 ◽  
Author(s):  
Yasmine Katrib ◽  
Scot T. Martin ◽  
Hui-Ming Hung ◽  
Yinon Rudich ◽  
Haizheng Zhang ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Aerosol Particles ◽  
Core Shell ◽  
Ozone Reactions

scholarly journals Silica Coating of Metal-Loaded H-ZSM-22 to Form the Core-Shell Nanostructures: Characterization, Textural Properties, and Catalytic Potency in the Esterification of Oleic Acid

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Maryam Haghighi ◽  
Mehranoosh Fereidooni
Keyword(s):  
Oleic Acid ◽  
Electron Microscope ◽  
Active Sites ◽  
Maximum Yield ◽  
Operating Conditions ◽  
Molar Ratio ◽  
Emission Spectrometry ◽  
Esterification Reaction ◽  
Core Shell ◽  
The Core

In this study, ZSM-22 was synthesized using N,N-diethylaniline as a template through a hydrothermal method. The proton and various metals such as zirconium, strontium, and iron were immobilized on the surface of obtained zeolites through the ion exchange method. The catalysts were studied by Fourier-Transform Infrared Spectroscopy (FT-IR), X-Ray Diffraction (XRD), Brunauer–Emmett–Teller (BET) adsorption isotherms, Transmission Electron Microscope (TEM), Scanning Electron Microscope (SEM), Inductively Coupled Plasma-Optical Emission Spectrometry (ICP-OES) elemental analysis, and Temperature-Programmed Desorption of ammonia (TPD-NH3) technique for determining the number of acid sites. In the esterification reaction of oleic acid, the operating conditions such as catalyst dosage, temperature, molar ratio of methanol to oil, and reaction time were optimized and adjusted at 11 wt%, 70°C, 10 : 1, and 48 h subsequently. The maximum yield% of 48.07% was achieved in the presence of Zr-H-ZSM-22 at optimum conditions. In order to improve the efficiency of three zeolites Zr-H-ZSM-22, Fe-H-ZSM-22, and Sr-H-ZSM-22, the core-shell structures with SiO2 coating were prepared. Zr-H-ZSM-22@SiO2 was less active than Zr-H-ZSM-22 due to the SiO2 coverage of Lewis active sites.

Synthesis and magnetooptic characterization of Cu-doped ZnO/MgO and ZnO/oleic acid core/shell nanoparticles

RSC Advances ◽  
2016 ◽  
Vol 6 (50) ◽  
pp. 44820-44825 ◽  
Author(s):  
J. Mikulski ◽  
B. Sikora ◽  
K. Fronc ◽  
P. Aleshkevych ◽  
S. Kret ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Magnetic Behavior ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Ion Doping ◽  
Doped Zno ◽  
Core Shell Nanoparticles

The effect of Cu ion doping on the photoluminescence (PL) and magnetic behavior of ZnO/MgO and ZnO/oleic acid core/shell nanoparticles is investigated.

Multispectroscopic (FTIR, XPS, and TOFMS−TPD) Investigation of the Core−Shell Bonding in Sonochemically Prepared Aluminum Nanoparticles Capped with Oleic Acid

2010 ◽  
Vol 114 (14) ◽  
pp. 6377-6380 ◽  
Author(s):  
William K. Lewis ◽  
Andrew T. Rosenberger ◽  
Joseph R. Gord ◽  
Christopher A. Crouse ◽  
Barbara A. Harruff ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Core Shell ◽  
Aluminum Nanoparticles ◽  
The Core

scholarly journals Interpreting turbidity measurements for vesicle studies

2018 ◽  
Author(s):  
Anna Wang ◽  
Christopher Chan Miller ◽  
Jack W. Szostak
Keyword(s):  
Experimental Data ◽  
Exact Solution ◽  
Oleic Acid ◽  
Multiple Scattering ◽  
Excellent Agreement ◽  
Core Shell ◽  
Comprehensive Overview ◽  
Vesicle Size ◽  
Vesicle Membranes ◽  
Scatter Light

Spectrophotometers are routinely used to assess the turbidity of vesicle solutions. Here we provide guidelines for interpreting turbidity measurements of vesicle samples, and highlight potential pitfalls of the approach. We use an exact solution for core-shell scatterers to model and calculate how samples of vesicles scatter light, and provide a comprehensive overview of how the turbidity of vesicle samples can change with vesicle size, contents, and composition. Surprisingly, we find that vesicle lamellarity has a large effect on sample turbidity, while unilamellar vesicles of different sizes have similar turbidity. We use our model in conjunction with experimental data to measure the thickness of oleic acid vesicle membranes and find excellent agreement with values determined by cryo-TEM. We also calculate the effects of potential errors in measurement from forward scattering and multiple scattering.

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