Improving safety and thermal decomposition performance by the in situ synthesis of core–shell structured ammonium perchlorate/cobalt acetate hydroxide composites

2021 ◽  
Author(s):  
Heng Zhai ◽  
Pengfei Xu ◽  
Yueqi Li ◽  
Ping Ye ◽  
Ruihao Wang ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Shell Structure ◽  
Catalytic Mechanism ◽  
Cobalt Acetate ◽  
In Situ Synthesis ◽  
Core Shell ◽  
The Core ◽  
Core Shell Structure ◽  
Decomposition Properties

The AP/Co3(CH3COO)5(OH) composites of the core–shell structure were prepared, the safety and thermal decomposition properties of AP were improved simultaneously, and the possible catalytic mechanism was analyzed.

In situ synthesis of novel urchin-like ZnS/Ni3S2@Ni composite with a core–shell structure for efficient electromagnetic absorption

2015 ◽  
Vol 3 (41) ◽  
pp. 10862-10869 ◽  
Author(s):  
Biao Zhao ◽  
Gang Shao ◽  
Bingbing Fan ◽  
Wanyu Zhao ◽  
Shihao Zhang ◽  
...  
Keyword(s):  
Electromagnetic Wave ◽  
Shell Structure ◽  
In Situ Synthesis ◽  
Core Shell ◽  
Absorption Properties ◽  
Electromagnetic Wave Absorption ◽  
Wave Absorption ◽  
Electromagnetic Absorption ◽  
Core Shell Structure

A core–shell ternary ZnS/Ni3S2@Ni composite exhibiting superior electromagnetic wave absorption properties was synthesized.

In situ synthesis of a multifunctional polymer with a stable core-shell structure for effective dewatering

2019 ◽  
Vol 141 ◽  
pp. 105858
Author(s):  
Suhong Zhang ◽  
Yanlong Wen ◽  
Liguang Wang ◽  
Yongkang Yang ◽  
Shengyu Liu
Keyword(s):  
Shell Structure ◽  
In Situ Synthesis ◽  
Core Shell ◽  
Stable Core ◽  
Core Shell Structure

In situ synthesis of n–n Bi2MoO6 & Bi2S3 heterojunctions for highly efficient photocatalytic removal of Cr(vi)

2018 ◽  
Vol 6 (45) ◽  
pp. 22580-22589 ◽  
Author(s):  
Xiu-Qing Qiao ◽  
Zhen-Wei Zhang ◽  
Qiu-Hao Li ◽  
Dongfang Hou ◽  
Qichun Zhang ◽  
...  
Keyword(s):  
Visible Light ◽  
Visible Light Irradiation ◽  
Shell Structure ◽  
In Situ Synthesis ◽  
Light Irradiation ◽  
Core Shell ◽  
Two Dimensional ◽  
Photocatalytic Removal ◽  
Core Shell Structure

Two-dimensional (2D) n–n Bi2MoO6 & Bi2S3 heterojunction with core–shell structure exhibits unprecedented efficiency for photocatalytic reduction of Cr(vi) under visible light irradiation.

scholarly journals In situ preparation and protein delivery of silicate–alginate composite microspheres with core-shell structure

2011 ◽  
Vol 8 (65) ◽  
pp. 1804-1814 ◽  
Author(s):  
Chengtie Wu ◽  
Wei Fan ◽  
Michael Gelinsky ◽  
Yin Xiao ◽  
Jiang Chang ◽  
...  
Keyword(s):  
Sustained Release ◽  
Shell Structure ◽  
Protein Delivery ◽  
Protein Release ◽  
Fickian Diffusion ◽  
Core Shell ◽  
Burst Release ◽  
The Core ◽  
Core Shell Structure

The efficient loading and sustained release of proteins from bioactive microspheres remain a significant challenge. In this study, we have developed bioactive microspheres which can be loaded with protein and then have a controlled rate of protein release into a surrounding medium. This was achieved by preparing a bioactive microsphere system with core-shell structure, combining a calcium silicate (CS) shell with an alginate (A) core by a one-step in situ method. The result was to improve the microspheres' protein adsorption and release, which yielded a highly bioactive material with potential uses in bone repair applications. The composition and the core-shell structure, as well as the formation mechanism of the obtained CS–A microspheres, were investigated by X-ray diffraction, optical microscopy, scanning electron microscopy, energy dispersive spectrometer dot and line-scanning analysis. The protein loading efficiency reached 75 per cent in CS–A microspheres with a core-shell structure by the in situ method. This is significantly higher than that of pure A or CS–A microspheres prepared by non- in situ method, which lack a core-shell structure. CS–A microspheres with a core-shell structure showed a significant decrease in the burst release of proteins, maintaining sustained release profile in phosphate-buffered saline (PBS) at both pH 7.4 and 4.3, compared with the controls. The protein release from CS–A microspheres is predominantly controlled by a Fickian diffusion mechanism. The CS–A microspheres with a core-shell structure were shown to have improved apatite-mineralization in simulated body fluids compared with the controls, most probably owing to the existence of bioactive CS shell on the surface of the microspheres. Our results indicate that the core-shell structure of CS–A microspheres play an important role in enhancing protein delivery and mineralization, which makes these composite materials promising candidates for application in bone tissue regeneration.

In-situ synthesis of core-shell structure W(WC) composite grains in W-Cu composites fabricated by infiltration

2021 ◽  
Vol 864 ◽  
pp. 158633
Author(s):  
Qiao Chen ◽  
Lvda Li ◽  
Xucun Man ◽  
Han Sui ◽  
Jinping Liu ◽  
...  
Keyword(s):  
Shell Structure ◽  
In Situ Synthesis ◽  
Core Shell ◽  
Core Shell Structure

scholarly journals A SERS Study of Charge Transfer Process in Au Nanorod–MBA@Cu2O Assemblies: Effect of Length to Diameter Ratio of Au Nanorods

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 867
Author(s):  
Lin Guo ◽  
Zhu Mao ◽  
Sila Jin ◽  
Lin Zhu ◽  
Junqi Zhao ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Shell Structure ◽  
Shell Structures ◽  
Core Shell ◽  
Absorption Bands ◽  
Au Nanorods ◽  
The Core ◽  
Band Position ◽  
Surface Enhanced Raman ◽  
Core Shell Structure

Surface-enhanced Raman scattering (SERS) is a powerful tool in charge transfer (CT) process research. By analyzing the relative intensity of the characteristic bands in the bridging molecules, one can obtain detailed information about the CT between two materials. Herein, we synthesized a series of Au nanorods (NRs) with different length-to-diameter ratios (L/Ds) and used these Au NRs to prepare a series of core–shell structures with the same Cu2O thicknesses to form Au NR–4-mercaptobenzoic acid (MBA)@Cu2O core–shell structures. Surface plasmon resonance (SPR) absorption bands were adjusted by tuning the L/Ds of Au NR cores in these assemblies. SERS spectra of the core-shell structure were obtained under 633 and 785 nm laser excitations, and on the basis of the differences in the relative band strengths of these SERS spectra detected with the as-synthesized assemblies, we calculated the CT degree of the core–shell structure. We explored whether the Cu2O conduction band and valence band position and the SPR absorption band position together affect the CT process in the core–shell structure. In this work, we found that the specific surface area of the Au NRs could influence the CT process in Au NR–MBA@Cu2O core–shell structures, which has rarely been discussed before.

scholarly journals In Situ Synthesis of Core-Shell-Structured SiCp Reinforcements in Aluminium Matrix Composites by Powder Metallurgy

Metals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 1201
Author(s):  
Xinghua Ji ◽  
Cheng Zhang ◽  
Shufeng Li
Keyword(s):  
Particle Size ◽  
Powder Metallurgy ◽  
Shell Structure ◽  
Ex Situ ◽  
Aluminium Matrix ◽  
Core Shell ◽  
Matrix Composites ◽  
Aluminium Matrix Composites ◽  
Core Shell Structure

SiCp reinforced aluminium matrix composites (AMCs), which are widely used in the aerospace, automotive, and electronic packaging fields along with others, are usually prepared by ex situ techniques. However, interfacial contamination and poor wettability of the ex situ techniques make further improvement in their comprehensive performance difficult. In this paper, SiCp reinforced AMCs with theoretical volume fractions of 15, 20, and 30% are prepared by powder metallurgy and in situ reaction via an Al-Si-C system. Moreover, a combined method of external addition and an in situ method is used to investigate the synergistic effect of ex situ and in situ SiCp on AMCs. SiC particles can be formed by an indirect reaction: 4Al + 3C → Al4C3 and Al4C3 + 3Si → 3SiC + 4Al. This reaction is mainly through the diffusion of Si, in which Si diffuses around Al4C3 and then reacts with Al4C3 to form SiCp. The in situ SiC particles have a smooth boundary, and the particle size is approximately 1–3 μm. A core-shell structure having good bonding with an aluminium matrix was generated, which consists of an ex situ SiC core and an in situ SiC shell with a thickness of 1–5 μm. The yield strength and ultimate tensile strength of in situ SiCp reinforced AMCs can be significantly increased with a constant ductility by adding 5% ex situ SiCp for Al-28Si-7C. The graphite particle size has a significant effect on the properties of the alloy. A criterion to determine whether Al4C3 is a complete reaction is achieved, and the forming mechanism of the core-shell structure is analysed.

Construction of MOFs-Shell Porous Materials and Performance Study in Selective Adsorption and Separation of Benzene Pollutants

2021 ◽  
Author(s):  
Yu Qiao ◽  
Na Lv ◽  
Dong Li ◽  
Hongji Li ◽  
Xiangxin Xue ◽  
...  
Keyword(s):  
Porous Materials ◽  
Shell Structure ◽  
Selective Adsorption ◽  
Core Shell ◽  
Architecture Design ◽  
Performance Study ◽  
The Core ◽  
Core Shell Structure ◽  
And Performance ◽  
Sacrificial Agent

Metastable Cu2O is an attractive material for the architecture design of integrated nanomaterials. In this context, Cu2O was used as the sacrificial agent to form the core-shell structure of Cu2O@HKUST-1...

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