Nanocomposites of CsPbBr3 perovskite nanocrystals in an ammonium bromide framework with enhanced stability

2017 ◽  
Vol 5 (30) ◽  
pp. 7431-7435 ◽  
Author(s):  
Sunqi Lou ◽  
Tongtong Xuan ◽  
Caiyan Yu ◽  
Mengmeng Cao ◽  
Chao Xia ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Ion Exchange ◽  
Shell Structure ◽  
Water Resistance ◽  
Ammonium Bromide ◽  
Core Shell ◽  
Excellent Thermal Stability ◽  
Long Lifetime ◽  
Core Shell Structure ◽  
Enhanced Stability

The CsPbBr3@NH4Br nanocomposites were successfully synthesized through ion exchange. The nanocomposites possessed a special core@shell structure and exhibited a high absolute PLQY, long lifetime, good water resistance and excellent thermal stability.

scholarly journals Core/Shell Structure of TiO2-Coated MWCNTs for Thermal Protection for High-Temperature Processing of Metal Matrix Composites

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Laura Angélica Ardila Rodriguez ◽  
Dilermando Nagle Travessa
Keyword(s):  
Thermal Stability ◽  
Metal Matrix Composites ◽  
Shell Structure ◽  
Metal Matrix ◽  
Thermal Protection ◽  
Oxidation Stability ◽  
Core Shell ◽  
Matrix Composites ◽  
X Ray ◽  
Core Shell Structure

The production of metal matrix composites with elevated mechanical properties depends largely on the reinforcing phase properties. Due to the poor oxidation resistance of multiwalled carbon nanotubes (MWCNTs) as well as their high reactivity with molten metal, the processing conditions for the production of MWCNT-reinforced metal matrix composites may be an obstacle to their successful use as reinforcement. Coating MWCNTs with a ceramic material that acts as a thermal protection would be an alternative to improve oxidation stability. In this work, MWCNTs previously functionalized were coated with titanium dioxide (TiO2) layers of different thicknesses, producing a core-shell structure. Heat treatments at three different temperatures (500°C, 750°C, and 1000°C) were performed on coated nanotubes in order to form a stable metal oxide structure. The MWCNT/TiO2 hybrids produced were evaluated in terms of thermal stability. Thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy (RS), and X-ray photoelectron spectroscopy (XPS) were performed in order to investigate TiO2-coated MWCNT structure and thermal stability under oxidative atmosphere. It was found that the thermal stability of the TiO2-coated MWCNTs was dependent of the TiO2 layer morphology that in turn depends on the heat treatment temperature.

One-pot synthesis of Au–Fe2O3@SiO2 core–shell nanoreactors for CO oxidation

2020 ◽  
Vol 44 (15) ◽  
pp. 5661-5665
Author(s):  
Hongbo Yu ◽  
Zhengtong Guo ◽  
Chunzheng Wu ◽  
Shujian Wang ◽  
Bin Li ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Co Oxidation ◽  
High Activity ◽  
Shell Structure ◽  
Core Shell ◽  
One Pot ◽  
Good Thermal Stability ◽  
One Pot Synthesis ◽  
Core Shell Structure

The combination of the Au–Fe2O3 phase and core–shell structure helps in achieving high activity and good thermal stability.

Characterization of Core-Shell Structure Palygorskite Modified by Nano-CaCO3 (PnC) Composite Particles

2013 ◽  
Vol 750-752 ◽  
pp. 348-351
Author(s):  
Di Fang Zhao ◽  
Ming Hua Li ◽  
Jin Song Xie
Keyword(s):  
Thermal Stability ◽  
Shell Structure ◽  
Composite Particles ◽  
Core Shell ◽  
X Ray Diffraction ◽  
Stability Properties ◽  
Structure Morphology ◽  
Palygorskite Clay ◽  
Core Shell Structure

In this work, Core-shell structure palygorskite/nanoCaCO3(PnC) composite particles have been synthesized chemically, employing solution precipitation methods. Crystal structure, morphology and thermal stability properties are investigated by means of X-ray diffraction (XRD), transmission electronic microscopy (TEM) and Thermogravimetric (TG) analysis. The results showed that the PnC particles were almost monodispersed microsphere aspect with the size was about 1-3 μm diameter. The nanocomposite particles exhibit the marked thermal stability properties than the palygorskite clay mineral.

scholarly journals Synthesis and Surface Properties of Silica Spheres with Core Shell Structure by One Convenient Method

2009 ◽  
Vol 2009 ◽  
pp. 1-5 ◽  
Author(s):  
D. P. Das ◽  
K. M. Parida ◽  
B. K. Mishra
Keyword(s):  
Mesoporous Silica ◽  
Shell Structure ◽  
Cost Effective ◽  
Molar Ratio ◽  
Ammonium Bromide ◽  
Core Shell ◽  
Silica Spheres ◽  
Core Shell Structure ◽  
Cetyltrimethyl Ammonium ◽  
Mesoporous Silica Spheres

Earlier, we have published a paper on the preparation of silica sphere using propanol as cosurfactant. We report here a highly cost-effective method of preparation of mesoporous silica spheres with core shell structure using sodium silicate as silica precursor, cetyltrimethyl ammonium bromide (CTAB) as surfactant, and methanol as cosurfactant. Thus after removal of the template by dissolutions or/and activation at higher temperature, mesoporous silica spheres with core shell structure were obtained. The products prepared with methanol to CTAB molar ratio 8.5 : 1 were confirmed to give best results. All the spherical products have very large surface area (∼589–1044 m2/g), pore volume (∼0.98–1.41 cm3/g), and ordered pore structure.

Mussel-inspired coating of energetic crystals: A compact core–shell structure with highly enhanced thermal stability

2017 ◽  
Vol 309 ◽  
pp. 140-150 ◽  
Author(s):  
Feiyan Gong ◽  
Jianhu Zhang ◽  
Ling Ding ◽  
Zhijian Yang ◽  
Xiaobing Liu
Keyword(s):  
Thermal Stability ◽  
Shell Structure ◽  
Core Shell ◽  
Core Shell Structure

Single‐Crystal Red Phosphors and Their Core–Shell Structure for Improved Water‐Resistance for Laser Diodes Applications

2020 ◽  
Author(s):  
Jianbang Zhou ◽  
Yunfeng Wang ◽  
Yingyuan Chen ◽  
Yayun Zhou ◽  
Bojana Milićević ◽  
...  
Keyword(s):  
Single Crystal ◽  
Shell Structure ◽  
Water Resistance ◽  
Laser Diodes ◽  
Core Shell ◽  
Red Phosphors ◽  
Core Shell Structure

Synthesis and Characterization on ATP/TiO2/PANI Core-Shell Nanocomposites

2011 ◽  
Vol 282-283 ◽  
pp. 354-358 ◽  
Author(s):  
Lu Lu Chen ◽  
Hong Yan Ding ◽  
Yue Zhang ◽  
Guang Hong Zhou
Keyword(s):  
Thermal Stability ◽  
Shell Structure ◽  
Oxidative Polymerization ◽  
Core Shell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermal Analyzer ◽  
Degree Of Crystallization ◽  
Core Shell Structure ◽  
Thermal Stability Of

Conducting attapulgite/titania/polyaniline/ (ATP/TiO2/PANI) core-shell nanocomposites (CSNs) were synthesized via oxidative polymerization of aniline after the surface modification of the ATP carried with TiO2nanoparticles. The structure and morphology of the ATP/TiO2/PANI CSNs were characterized by X-ray diffraction, scanning electron microscopy, and fourier transform infrared. The thermal stability of the ATP/TiO2/PANI CSNs was also investigated by thermal analyzer. The results show that the ATP/TiO2/PANI CSNs display “capsule like” core-shell structure, of which ranging in diameter of about 80 nm and length of about 250 nm. In addition, the ATP/TiO2/PANI CSNs present a higher degree of crystallization and better thermal stability. We believe that the excellent core-shell structure and better thermal stability should be prone to improve their other properties and enlarge their application.

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