In situ fabrication of core–shell-structured Beta@Silicalite-1 catalysts by a novel steam-assisted crystallization strategy

CrystEngComm ◽  
2020 ◽  
Vol 22 (5) ◽  
pp. 945-954 ◽  
Author(s):  
Lanjian Xu ◽  
Yangyang Yuan ◽  
Jie Zhang ◽  
Yanfei Zhang ◽  
Xiaomin Zhang ◽  
...  
Keyword(s):  
Core Shell ◽  
The Core ◽  
In Situ Fabrication

A green and efficient steam-assisted crystallization (SAC) strategy was employed to synthesize a core–shell zeolite with different frameworks between the core and shell, Beta@Silicalite-1.

Synthesis Technology of Silica Aerogels/Polystyrene Core-Shell Composite Materials

2010 ◽  
Vol 168-170 ◽  
pp. 1833-1836
Author(s):  
Gang Qiang Geng ◽  
Jing Tao Guo ◽  
Jun Jun Zou ◽  
Gong Xun Bian
Keyword(s):  
Composite Materials ◽  
Polymerization Process ◽  
System Component ◽  
Core Shell ◽  
Ultrasound Technique ◽  
The Core ◽  
Optimum Reaction ◽  
The Impact ◽  
Shell Composite

In order to obtain super aerogels heat insulating composite materials with silane coupling agent on the in-situ surface treatment. The core-shell structure composite materials have been prepared by dispersion polymerization process of polystyrene grafted on the SiO2 particles. By TEM on these samples the impact of the system components initiator polymerization parameters and dispersion process was discussed. The results showed that the system component of the greatest impact on conversion rate is the ratio of aerogels /St ,the optimum reaction temperature is 75 °C.With organic initiator KPS as initiator after a unique ultrasound technique to obtain the core-shell composite materials structure which coating is 70%.

scholarly journals In-Situ Synchrotron SAXS and WAXS Investigation on the Deformation of Single and Coaxial Electrospun P(VDF-TrFE)-Based Nanofibers

2021 ◽  
Vol 22 (23) ◽  
pp. 12669
Author(s):  
Yi-Jen Huang ◽  
Yi-Fan Chen ◽  
Po-Han Hsiao ◽  
Tu-Ngoc Lam ◽  
Wen-Ching Ko ◽  
...  
Keyword(s):  
Hierarchical Structures ◽  
Electrospun Nanofibers ◽  
Mechanical Anisotropy ◽  
Core Shell ◽  
Length Scale ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Core ◽  
Nanofiber Alignment

Coaxial core/shell electrospun nanofibers consisting of ferroelectric P(VDF-TrFE) and relaxor ferroelectric P(VDF-TrFE-CTFE) are tailor-made with hierarchical structures to modulate their mechanical properties with respect to their constituents. Compared with two single and the other coaxial membranes prepared in the research, the core/shell-TrFE/CTFE membrane shows a more prominent mechanical anisotropy between revolving direction (RD) and cross direction (CD) associated with improved resistance to tensile stress for the crystallite phase stability and good strength-ductility balance. This is due to the better degree of core/shell-TrFE-CTFE nanofiber alignment and the crystalline/amorphous ratio. The coupling between terpolymer P(VDF-TrFE-CTFE) and copolymer P(VDF-TrFE) is responsible for phase stabilization, comparing the core/shell-TrFE/CTFE with the pristine terpolymer. Moreover, an impressive collective deformation mechanism of a two-length scale in the core/shell composite structure is found. We apply in-situ synchrotron X-ray to resolve the two-length scale simultaneously by using the small-angle X-ray scattering to characterize the nanofibers and the wide-angle X-ray diffraction to identify the phase transformations. Our findings may serve as guidelines for the fabrication of the electrospun nanofibers used as membranes-based electroactive polymers.

Core-Shell Magnesium Hydroxide/Polymermer Nanoparticles Prepared by In Situ Emulsion Copolymerization

2011 ◽  
Vol 233-235 ◽  
pp. 2125-2128
Author(s):  
Li Li Xu ◽  
Sheng Peng Liu ◽  
Xuan Li
Keyword(s):  
Magnesium Hydroxide ◽  
Chemical Structure ◽  
Hybrid Nanoparticles ◽  
Core Shell ◽  
Polymer Shell ◽  
Emulsion Copolymerization ◽  
The Core ◽  
Polymer Hybrid ◽  
Transmission Electron

In this paper, vinylated magnesium hydroxide (MH) nanosheets were prepared with 3-(trimethoxysilyl) propyl methacrylate (γ-MPS) and pristine MH nanosheets, then the MH/polymer hybrid nanoparticles were prepared by in-situ emulsion copolymerization of vinylated MH nanosheets and styrene (St) monomer and styrene/butyl acrylate (St/BA) comonomer. The morphology, thermal stability and chemical structure of the final products were investigated in detail with transmission electron microscopy (TEM), thermogravimetric analysis (TGA) and Fourier-transform infrared spectra (FTIR). The TEM results showed that the core-shell structure of MH/Polymer nanoparticles with MH-cores and Polymer-shell was formed.

Synthesis and microstructure of conformal coatings on particulates

1997 ◽  
Vol 501 ◽  
Author(s):  
K. Rajan ◽  
P. Sajgalik ◽  
R. K. Singh ◽  
D. Kumar ◽  
J. Fitz-Gerald
Keyword(s):  
The Other ◽  
Core Shell ◽  
The Core ◽  
Crystallographic Characteristic ◽  
Synthesis Strategy ◽  
Conformal Coatings ◽  
Interface Structures ◽  
Individual Particles ◽  
Outer Coating

ABSTRACTIn this paper we present an overview of two very different approaches to the synthesis of composite particulates which result in a “core-shell” type structure. It is shown that both these synthesis approaches result in very characteristic interface structures between the outer coating and the host particles. One synthesis strategy is to use laser ablation deposition on individual particles and the other is to “coat” particles ‘in-situ’ by taking advantage of solid state diffusional transformations. Examination of the interface between the outer shell and the core of the particle shows that textured or toptactical growth occurs and it is suggested that this unique crystallographic characteristic may be responsible for the properties offered by these engineered particulates. The applications of such engineered particulates is also discussed.

scholarly journals An Investigation into the Bulk and Surface Phase Transformations of Bimetallic Pd-In/Al2O3 Catalyst during Reductive and Oxidative Treatments In Situ

Catalysts ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 859
Author(s):  
Nadezhda S. Smirnova ◽  
Evgeny V. Khramov ◽  
Galina N. Baeva ◽  
Pavel V. Markov ◽  
Andrey V. Bukhtiyarov ◽  
...  
Keyword(s):  
Inner Core ◽  
Core Shell ◽  
Surface Phase ◽  
The Core ◽  
Metallic Palladium ◽  
Different Temperatures ◽  
Core Shell Structure ◽  
Al2o3 Catalyst ◽  
Intermetallic Nanoparticles

A series of oxidative treatments of PdIn-supported intermetallic nanoparticles at different temperatures were performed. The bulk and surface structure of catalyst during phase transformation was investigated by bulk- and surface-sensitive techniques (in situ XAFS, DRIFTS of adsorbed CO). It was found that comparison of palladium and indium fractions in bulk and on the surface suggests the formation of a «core-shell» structure. According to obtained results, the core consists of In-depleted intermetallic compound or inhomogeneous bimetallic phase with the inner core of metallic Pd, when a mixture of indium oxide, metallic palladium and small part of PdIn is present on the surface.

In Situ Engineering of the Core–Shell Ag@Cu Structure on Porous Nanowire Arrays for High Energy and Stable Aqueous Ag–Bi Batteries

2020 ◽  
Vol 12 (9) ◽  
pp. 10332-10340
Author(s):  
Xiaohui Li ◽  
Xing Zhou ◽  
Long Li ◽  
Danyang Zhao ◽  
Xinling Gong ◽  
...  
Keyword(s):  
High Energy ◽  
Nanowire Arrays ◽  
Core Shell ◽  
The Core

Insight into growth of Au–Pt bimetallic nanoparticles: anin situXAS study

2017 ◽  
Vol 24 (4) ◽  
pp. 825-835 ◽  
Author(s):  
Chandrani Nayak ◽  
D. Bhattacharyya ◽  
K. Bhattacharyya ◽  
A. K. Tripathi ◽  
R. D. Bapat ◽  
...  
Keyword(s):  
Bimetallic Nanoparticles ◽  
Energy Dispersive ◽  
Core Shell ◽  
One Pot ◽  
X Ray ◽  
The Core ◽  
One Pot Synthesis ◽  
X Ray Absorption ◽  
Insight Into

Au–Pt bimetallic nanoparticles have been synthesized through a one-pot synthesis route from their respective chloride precursors using block copolymer as a stabilizer. Growth of the nanoparticles has been studied by simultaneousin situmeasurement of X-ray absorption spectroscopy (XAS) and UV–Vis spectroscopy at the energy-dispersive EXAFS beamline (BL-08) at Indus-2 SRS at RRCAT, Indore, India.In situXAS spectra, comprising both X-ray near-edge structure (XANES) and extended X-ray absorption fine-structure (EXAFS) parts, have been measured simultaneously at the Au and PtL3-edges. While the XANES spectra of the precursors provide real-time information on the reduction process, the EXAFS spectra reveal the structure of the clusters formed in the intermediate stages of growth. This insight into the formation process throws light on how the difference in the reduction potential of the two precursors could be used to obtain the core–shell-type configuration of a bimetallic alloy in a one-pot synthesis method. The core–shell-type structure of the nanoparticles has also been confirmed byex situenergy-dispersive spectroscopy line-scan and X-ray photoelectron spectroscopy measurements within situion etching on fully formed nanoparticles.

In Situ Formation of the Core–Shell Particles and Their Function in Toughening PA6/SEBS-g-MA/PP Blends

2017 ◽  
Vol 56 (41) ◽  
pp. 11657-11663 ◽  
Author(s):  
Yijian Wu ◽  
Hui Zhang ◽  
Baoqing Shentu ◽  
Zhixue Weng
Keyword(s):  
Core Shell ◽  
The Core ◽  
In Situ Formation ◽  
Shell Particles ◽  
Pp Blends
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