Synthesis of core-shell microspheres with active hydroxyl groups by two-stage precipitation polymerization

2004 ◽  
Vol 54 (1) ◽  
pp. 168-174 ◽  
Author(s):  
Feng Bai ◽  
Xinlin Yang ◽  
Yuzeng Zhao ◽  
Wenqiang Huang
Keyword(s):  
Precipitation Polymerization ◽  
Core Shell ◽  
Hydroxyl Groups ◽  
Two Stage

scholarly journals Morphology Controlled Synthesis of γ-Al2O3 Nano-Crystallites in Al@Al2O3 Core–Shell Micro-Architectures by Interfacial Hydrothermal Reactions of Al Metal Substrates

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 310
Author(s):  
Dohyeon Han ◽  
Doohwan Lee
Keyword(s):  
Electrostatic Interactions ◽  
Heterogeneous Catalysts ◽  
Metal Substrate ◽  
Inorganic Anions ◽  
Core Shell ◽  
Hydroxyl Groups ◽  
Hydrothermal Reactions ◽  
Fine Control ◽  
Reaction Processes

Fine control of morphology and exposed crystal facets of porous γ-Al2O3 is of significant importance in many application areas such as functional nanomaterials and heterogeneous catalysts. Herein, a morphology controlled in situ synthesis of Al@Al2O3 core–shell architecture consisting of an Al metal core and a porous γ-Al2O3 shell is explored based on interfacial hydrothermal reactions of an Al metal substrate in aqueous solutions of inorganic anions. It was found that the morphology and structure of boehmite (γ-AlOOH) nano-crystallites grown at the Al-metal/solution interface exhibit significant dependence on temperature, type of inorganic anions (Cl−, NO3−, and SO42−), and acid–base environment of the synthesis solution. Different extents of the electrostatic interactions between the protonated hydroxyl groups on (010) and (001) facets of γ-AlOOH and the inorganic anions (Cl−, NO3−, SO42−) appear to result in the preferential growth of γ-AlOOH toward specific crystallographic directions due to the selective capping of the facets by adsorption of the anions. It is hypothesized that the unique Al@Al2O3 core–shell architecture with controlled morphology and exposed crystal-facets of the γ-Al2O3 shell can provide significant intrinsic catalytic properties with enhanced heat and mass transport to heterogeneous catalysts for applications in many thermochemical reaction processes. The direct fabrication of γ-Al2O3 nano-crystallites from Al metal substrate with in-situ modulation of their morphologies and structures into 1D, 2D, and 3D nano-architectures explored in this work is unique and can offer significant opportunities over the conventional methods.

Self-assembly of Au@Ag core–shell nanocuboids into staircase superstructures by droplet evaporation

Nanoscale ◽  
2018 ◽  
Vol 10 (1) ◽  
pp. 142-149 ◽  
Author(s):  
Xianzhong Yang ◽  
Jing Li ◽  
Yuxin Zhao ◽  
Jianhua Yang ◽  
Liyan Zhou ◽  
...  
Keyword(s):  
Self Assembly ◽  
Droplet Evaporation ◽  
Core Shell ◽  
Two Stage

Staircase superstructures of nanocuboids are achieved using two-stage droplet evaporation and SERS performances are demonstrated with layer dependency.

Two-Stage Melting in Core–Shell Nanoparticles: An Atomic-Scale Perspective

2012 ◽  
Vol 116 (21) ◽  
pp. 11837-11841 ◽  
Author(s):  
Rao Huang ◽  
Yu-Hua Wen ◽  
Zi-Zhong Zhu ◽  
Shi-Gang Sun
Keyword(s):  
Atomic Scale ◽  
Core Shell ◽  
Two Stage ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles

scholarly journals A turn-on fluorescent sensor based on coffee-grounds carbon dots for the detection of sodium cyclamate

2021 ◽  
Author(s):  
Junzhe Chen ◽  
Haiying Du ◽  
Yifeng Xu ◽  
Boyu Ma ◽  
Zhihong Zheng ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Quantum Dots ◽  
Shell Structure ◽  
Sulfamic Acid ◽  
Carbon Quantum Dots ◽  
Core Shell ◽  
Hydroxyl Groups ◽  
Coffee Grounds ◽  
Core Shell Structure ◽  
Sodium Cyclamate

Abstract Carbon quantum dots (CQDs) were synthesized by coffee-grounds as carbon source under hydrothermal carbonization treatment for the first time. The obtained CQDs showed a strong emission at the wavelength of 460 nm, with an optimum excitation of 370 nm, and enrichment of the surface functional groups(-OH, -NH2). Sodium cyclamate in an aqueous solution and the CQDs could form a core-shell structure by hydrogen-bonding and van der waals bonding to enhance the fluorescent emission. Cyclohexyl sulfamate forms cyclohexyl sulfamate in an aqueous solution and then undergoes dehydration and condensation with the hydroxyl groups on the carbon quantum dots, and finally sodium cyclamate forms a core-shell structure around the carbon quantum dots.环己基氨基磺酸盐在水溶液中形成环己基氨基磺酸盐，然后与碳量子点上的羟基进行脱水和缩合，最后环甜酸钠在碳量子点周围形成核-壳结构。Cyclohexyl sulfamate form a cyclohexyl sulfamic acid in an aqueous solution followed by dehydration condensation with hydroxyl groups on the carbon quantum dots, cyclamate final core-shell structure is formed in the peripheral carbon quantum dot,

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