scholarly journals Atomically thin Pt shells on Au nanoparticle cores: facile synthesis and efficient synergetic catalysis

2016 ◽  
Vol 4 (9) ◽  
pp. 3278-3286 ◽  
Author(s):  
C. Engelbrekt ◽  
N. Šešelj ◽  
R. Poreddy ◽  
A. Riisager ◽  
J. Ulstrup ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Electrochemical Oxidation ◽  
Aromatic Ring ◽  
Au Nanoparticle ◽  
Core Shell ◽  
Facile Synthesis ◽  
One Pot ◽  
Mild Conditions ◽  
The Core ◽  
Thin Platinum

Atomically thin platinum shells on gold nanoparticles (NPs) are synthesized in one pot under mild conditions. The core-shell NPs exhibit excellent catalysis for energy related processes such as electrochemical oxidation of biofuels, aromatic ring hydrogenation, and γ-valerolactone production.

scholarly journals MXene Core-Shell Nanosheets: Facile Synthesis, Optical Properties, and Versatile Photonics Applications

Nanomaterials ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1995
Author(s):  
Yunjia Wang ◽  
Shunxiang Liu ◽  
Feng Zhu ◽  
Yiyu Gan ◽  
Qiao Wen
Keyword(s):  
Gold Nanoparticles ◽  
Research Work ◽  
Mode Locking ◽  
Single Frequency ◽  
Core Shell ◽  
Complex Structures ◽  
Facile Synthesis ◽  
Laser Applications ◽  
Saturable Absorbers ◽  
Frequency Laser

In recent years, the transition metal carbonitrides(MXenes) have been widely applied to photoelectric field, and better performance of these applications was achieved via MXene complex structures. In our work, we proposed a MXene core-shell nanosheet composed of a Ti2C (MXene) phase and gold nanoparticles, and applied it to mode-locked and single-frequency fiber laser applications. The optoelectronic results suggested that the performances of these two applications were both improved when MXene core-shell nanosheets were applied. As a result, we obtained a mode-locking operation with 670 fs pulses, and the threshold pump power reached to as low as 20 mW. Besides, a single-frequency laser with the narrowest linewidth of ~1 kHz is also demonstrated experimentally. Our research work proved that MXene core-shell nanosheets could be used as saturable absorbers (SAs) to promote versatile photonic applications.

scholarly journals Conformation Study of Dual Stimuli-Responsive Core-Shell Diblock Polymer Brushes

Polymers ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1084
Author(s):  
Kaimin Chen ◽  
Lan Cao ◽  
Ying Zhang ◽  
Kai Li ◽  
Xue Qin ◽  
...  
Keyword(s):  
Polymer Brushes ◽  
Core Shell ◽  
Stimuli Responsive ◽  
Research Topics ◽  
Design And Synthesis ◽  
Mild Conditions ◽  
The Core ◽  
Responsive Polymer ◽  
Stimuli Responsive Polymer ◽  
Shed Light

Stimuli-responsive nanoparticles are among the most popular research topics. In this study, two types of core-shell (polystyrene with a photoiniferter (PSV) as the core and diblock as the shell) polymer brushes (PSV@PNIPA-b-PAA and PSV@PAA-b-PNIPA) were designed and prepared using surface-initiated photoiniferter-mediated polymerization (SI-PIMP). Moreover, their pH- and temperature-stimuli responses were explored by dynamic light scattering (DLS) and turbidimeter under various conditions. The results showed that the conformational change was determined on the basis of the competition among electrostatic repulsion, hydrophobic interaction, hydrogen bonding, and steric hindrance, which was also confirmed by protein adsorption experiments. These results are not only helpful for the design and synthesis of stimuli-responsive polymer brushes but also shed light on controlled protein immobilization under mild conditions.

Aromatic thiol-modulated Ag overgrowth on gold nanoparticles: tracking the thiol's position in the core–shell nanoparticles

Nanoscale ◽  
2019 ◽  
Vol 11 (37) ◽  
pp. 17471-17477 ◽  
Author(s):  
Jiaqi Chen ◽  
Dejing Meng ◽  
Hui Wang ◽  
Haiyun Li ◽  
Yinglu Ji ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Growth Process ◽  
Shell Growth ◽  
Core Shell ◽  
Internal Reference ◽  
Shell Nanoparticles ◽  
Aromatic Thiol ◽  
The Core ◽  
Spatial Trajectory ◽  
Core Shell Nanoparticles

Using DMAB as the Raman internal reference, the spatial trajectory of modulating 4-ATP molecules was tracked during the shell growth process.

Facile synthesis of core–shell Ag@C nanospheres with improved tribological properties for water-based additives

2018 ◽  
Vol 42 (11) ◽  
pp. 8773-8782 ◽  
Author(s):  
Haojie Song ◽  
Jian Huang ◽  
Xiaohua Jia ◽  
Weichen Sheng
Keyword(s):  
Tribological Properties ◽  
Glucose Solution ◽  
Tribological Performance ◽  
Core Shell ◽  
Facile Synthesis ◽  
The Core ◽  
Water Based

The core–shell Ag@C nanospheres were obtained from glucose solution by coupling reduction AgNO3 and catalytic carbonation. The tribological performance of Ag@C nanospheres as a water-based additive can be improved.

A Thermogravimetric Study of Alakanethiolate Monolayer-Capped Gold Nanoparticle Catalysts

2003 ◽  
Vol 789 ◽  
Author(s):  
Mathew M. Maye ◽  
Sandy Chen ◽  
Wai-Ben Chan ◽  
Lingyan Wang ◽  
Peter Njoki ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Surface Composition ◽  
Model System ◽  
Core Shell ◽  
Oxidation Of Co ◽  
Nanoparticle Catalysts ◽  
The Core ◽  
Catalytic Application ◽  
Treatment Conditions ◽  
Shell Composition

ABSTRACTThe application of molecularly-capped gold nanoparticles (1–5 nm) in catalysis (e.g., electrocatalytic oxidation of CO and methanol) requires a thorough understanding of the surface composition and structural properties. Gold nanoparticles consisting of metallic or alloy cores and organic encapsulating shells serve as an intriguing model system. One of the challenges for the catalytic application is the ability to manipulate the core and the shell properties in controllable ways. There is a need to understand the relative core-shell composition and the ability to remove the shell component under thermal treatment conditions. In this paper, we report results of a thermogravimetric analysis of the alkanethiolate monolayer-capped gold nanoparticles. This investigation is aimed at enhancing our understanding of the relative core-shell composition and thermal profiles.

scholarly journals From a precursor to an etchant: spontaneous inversion of the role of Au(iii) chloride for one-pot synthesis of smooth and spherical gold nanoparticles

2019 ◽  
Vol 1 (6) ◽  
pp. 2157-2161 ◽  
Author(s):  
Seokyoung Yoon ◽  
Chansong Kim ◽  
Byoungsang Lee ◽  
Jung Heon Lee
Keyword(s):  
Gold Nanoparticles ◽  
Facile Synthesis ◽  
One Pot ◽  
One Pot Synthesis ◽  
Spherical Gold Nanoparticles

Inversion of the role of Au(iii) chloride allows facile synthesis of smooth and spherical AuNPs with nanoscale size tunability.

One-Pot Sequential Multistep Transformation of α,β-Unsaturated Trifluoromethyl Ketones: Facile Synthesis of Trifluoromethylated 2-Pyridones

Synlett ◽  
2019 ◽  
Vol 30 (05) ◽  
pp. 605-609 ◽  
Author(s):  
Fa-Guang Zhang ◽  
Jun-An Ma ◽  
Ning Lv ◽  
Yi-Qiang Tian
Keyword(s):  
Facile Synthesis ◽  
One Pot ◽  
Good Efficiency ◽  
Trifluoromethyl Ketones ◽  
Mild Conditions ◽  
Efficient Access ◽  
Reaction Proceeds ◽  
High Yields ◽  
Unsaturated Trifluoromethyl Ketones

A one-pot transformation of α,β-unsaturated trifluoromethyl ketones with 2-(phenylsulfinyl)acetamide to give trifluoromethylated 2-pyridones is realized. The reaction proceeds under mild conditions and involves multiple steps in an expeditious and controlled sequence to provide efficient access to a broad range of trifluoromethylated 2-pyridones in moderate to high yields. Moreover, further synthetic manipulations permit the routine synthesis of a diverse array of trifluoromethylated pyridines with good efficiency.

scholarly journals Inner Rotation of Pickering Janus Emulsions

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3312
Author(s):  
Rajarshi Roy Raju ◽  
Joachim Koetz
Keyword(s):  
Magnetic Field ◽  
Gold Nanoparticles ◽  
Olive Oil ◽  
Silicone Oil ◽  
Core Shell ◽  
Water Interface ◽  
Pickering Emulsions ◽  
The Core ◽  
Oil Water ◽  
Inner Parts

Janus droplets were prepared by vortex mixing of three non-mixable liquids, i.e., olive oil, silicone oil and water, in the presence of gold nanoparticles (AuNPs) in the aqueous phase and magnetite nanoparticles (MNPs) in the olive oil. The resulting Pickering emulsions were stabilized by a red-colored AuNP layer at the olive oil/water interface and MNPs at the oil/oil interface. The core–shell droplets can be stimulated by an external magnetic field. Surprisingly, an inner rotation of the silicon droplet is observed when MNPs are fixed at the inner silicon droplet interface. This is the first example of a controlled movement of the inner parts of complex double emulsions by magnetic manipulation via interfacially confined magnetic nanoparticles.

scholarly journals One-Pot Reductive Acetylation of Aldehydes using 1-Hydrosilatrane in Acetic Acid

SynOpen ◽  
2019 ◽  
Vol 03 (01) ◽  
pp. 1-3 ◽  
Author(s):  
Reuben James ◽  
Sharon Herlugson ◽  
Sami Varjosaari ◽  
Vladislav Skrypai ◽  
Zainab Shakeel ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Organic Synthesis ◽  
Functional Group ◽  
Building Blocks ◽  
Flash Chromatography ◽  
Primary Alcohols ◽  
Facile Synthesis ◽  
One Pot ◽  
Aryl Aldehydes ◽  
Mild Conditions

A one-pot, direct reductive acetylation of aldehydes was achieved under mild conditions using 1-hydrosilatrane as a safe and easily accessible catalyst. Described herein is a facile synthesis that produces acylated primary alcohols that can serve as valuable building blocks for organic synthesis. The method has good functional group tolerance and works for a range of aryl aldehydes, with the notable exception of electron-rich arenes. A library of esters was isolated by flash chromatography in yields as high as 92%.

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