Microfluidic fabrication of cholesteric liquid crystal core–shell structures toward magnetically transportable microlasers

Lab on a Chip ◽  
2016 ◽  
Vol 16 (7) ◽  
pp. 1206-1213 ◽  
Author(s):  
Lu-Jian Chen ◽  
Ling-Li Gong ◽  
Ya-Li Lin ◽  
Xin-Yi Jin ◽  
Han-Ying Li ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Active Control ◽  
Shell Structure ◽  
Cholesteric Liquid Crystal ◽  
Band Edge ◽  
Shell Structures ◽  
Core Shell ◽  
Edge Mode ◽  
Crystal Core ◽  
Core Shell Structure

We report a magnetically transportable microlaser with cholesteric liquid crystal (CLC) core–shell structure, operating in band-edge mode, which might offer promise in in-channel illumination applications requiring active control.

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 Molecular dynamics study on the formation of self-organized core/shell structures in the Pb alloy at the nanoscale

RSC Advances ◽  
2017 ◽  
Vol 7 (84) ◽  
pp. 53509-53515 ◽  
Author(s):  
Tao Li ◽  
ZhiChao Wang ◽  
YunRui Duan ◽  
Jie Li ◽  
Hui Li
Keyword(s):  
Molecular Dynamics ◽  
Shell Structure ◽  
Shell Structures ◽  
Core Shell ◽  
Self Organized ◽  
Core Shell Structure

An abnormal self-organized core/shell structure is formed in the liquid Al–Pb alloy, which can be controlled by confined conditions.

scholarly journals Photocatalytic properties of a new Z-scheme system BaTiO3/In2S3 with a core–shell structure

RSC Advances ◽  
2019 ◽  
Vol 9 (20) ◽  
pp. 11377-11384 ◽  
Author(s):  
Kaili Wei ◽  
Baolai Wang ◽  
Jiamin Hu ◽  
Fuming Chen ◽  
Qing Hao ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Valence Band ◽  
Conduction Band ◽  
Shell Structure ◽  
Band Edge ◽  
Conduction Band Edge ◽  
Core Shell ◽  
Valence Band Edge ◽  
Core Shell Structure ◽  
Positive Valence

It's highly desired to design an effective Z-scheme photocatalyst with excellent charge transfer and separation, a more negative conduction band edge (ECB) than O2/·O2− (−0.33 eV) and a more positive valence band edge (EVB) than ·OH/OH− (+2.27 eV).

Highly mono-dispersed liquid crystal capsules with core–shell structure

2019 ◽  
Vol 94 (5) ◽  
pp. 055001
Author(s):  
Chul Gyu Jhun ◽  
Jang-Kun Song ◽  
Jin Seog Gwag
Keyword(s):  
Liquid Crystal ◽  
Shell Structure ◽  
Core Shell ◽  
Core Shell Structure

Preparation and Properties of ZnO@ZnS Nano-Array Core-Shell Structure with Different Concentration of TAA

2013 ◽  
Vol 652-654 ◽  
pp. 683-686
Author(s):  
An Dong Yuan ◽  
Yue Lu Zhang ◽  
Wei Guang Yang ◽  
Ji Rong Li ◽  
Yang Liao ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Shell Structure ◽  
Solution Method ◽  
Deionized Water ◽  
Shell Structures ◽  
Core Shell ◽  
X Ray Diffraction ◽  
X Ray ◽  
Core Shell Structure ◽  
Scanning Electron

ZnO@ZnS nano-array core-shell structure was synthesized through a solution method using a thioacetamide (TAA) solution in deionized water. The as-synthesized ZnO nano-array and TAA solution were employed to supply zinc and sulfur ions to form the ZnO@ZnS core-shell structures. The properties of the structure were characterized by X-ray diffraction (XRD), Raman spectrum, scanning electron microscopy (SEM) and UV-Vis spectra. The results indicate that ZnO nano-array was coated with ZnS particles. The concentration of TAA solution can affect the diameter, surface roughness and optical properties of the ZnO@ZnS nano-array core-shell structures.

A microwave-assisted synthesis of CoO@Co core–shell structures coupled with N-doped reduced graphene oxide used as a superior multi-functional electrocatalyst for hydrogen evolution, oxygen reduction and oxygen evolution reactions

2017 ◽  
Vol 5 (12) ◽  
pp. 5865-5872 ◽  
Author(s):  
X. X. Liu ◽  
J. B. Zang ◽  
L. Chen ◽  
L. B. Chen ◽  
X. Chen ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Hydrogen Evolution ◽  
Shell Structure ◽  
Shell Structures ◽  
Microwave Assisted Synthesis ◽  
Core Shell ◽  
Microwave Assisted ◽  
Reduced Graphene ◽  
Core Shell Structure

CoO@Co with a core–shell structure coupled with N-rGO used as a superior multifunctional electrocatalyst was obtained using a convenient and controllable technique.

Synthesis and Characterization of CdSe/CdS Core-Shell and CdSe/CdS Composites

1999 ◽  
Vol 581 ◽  
Author(s):  
M. Azad Malika ◽  
Paul O'Brien ◽  
N. Revaprasaduac
Keyword(s):  
Absorption Band ◽  
Shell Structure ◽  
Band Edge ◽  
Spherical Particles ◽  
Core Shell ◽  
Band Edge Emission ◽  
Absorption Band Edge ◽  
Emission Maximum ◽  
Core Shell Structure ◽  
Average Size

ABSTRACTHighly mono-dispersed CdSe/CdS core-shell and CdSe/CdS composites have been prepared by a novel route involving thermolysis in TOPO using Cd(Se2CNMe(nHex))2 and Cd(S2CNMe(nHex))2. The absorption band edge (652 nm, 1.90 eV) of the CdSe-CdS core-shell structure is red shifted (22 nm, 0.0 17 eV) as compared to the CdSe nanoparticles (630 nm, 1.96 eV) whereas the absorption spectrum of the CdSe-CdS composites shows the absorption band edge at (584 nm, 2.12 eV), blue shifted (46 nm, 0.037 eV) as expected. Photoluminescence (PL, λex = 400 nm) of both the core-shell (622 nm) and the composites (588 nm) show values close to band edge emission. A sharper emission maximum with a considerable increase of intensity is observed for core-shell structure as compared to that of CdSe whereas the composite showed a broader emission maximum. The TEM images of the CdSe/CdS core-shell nanoparticles show crystalline, spherical particles with the average size of 53 Å (±7 %), a increase of 8 Å than the average size of CdSe (45 Å) nanoparticles, with a narrow size distribution. The High Resolution Transmission Electron Microscopy (HRTEM) showed lattice spacing intermediate between those for CdSe and CdS as is observed by Selected Area Electron Diffraction (SAED) and X-ray patterns (hexagonal phase). As expected no interface can be observed by HRTEM between CdSe core and CdS shell. The TEM image of the CdSe-CdS composites show particles with an average size of 48.7 Å (±10%).

Formation of Core–Shell Structures in Emulsion Electrospun Fibres: A Comparative Study

2014 ◽  
Vol 67 (10) ◽  
pp. 1403 ◽  
Author(s):  
Chong Wang ◽  
Min Wang
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Shell Structure ◽  
Sodium Dodecyl ◽  
Water Phase ◽  
Shell Structures ◽  
Ionic Surfactant ◽  
Core Shell ◽  
The Core ◽  
Core Shell Structure ◽  
Span 80

Electrospinning has attracted great attention in recent years from different industries including biomedical engineering. Owing to the relative ease of fabricating ultrafine fibres with core–shell structures, emulsion electrospinning has been investigated intensively for making nanofibrous delivery vehicles for local and sustained release of bioactive or therapeutic substances, especially biomolecules such as growth factors. In preparing emulsions for electrospinning, different surfactants, ionic or non-ionic, can be used, which may subsequently influence the evolution of the core–shell structure in the electrospun emulsion jet or fibre. In this investigation, emulsions consisting of deionized water or phosphate buffer saline as the water phase, a poly(lactic-co-glycolic acid) solution as the oil phase and Span 80 (a non-ionic surfactant) or sodium dodecyl sulfate (an ionic surfactant) were electrospun into fibres for studying the core–shell structure and its evolution in emulsion electrospun fibres. Different microscopies were employed to study the morphological changes of the water phase in fibre samples collected at different locations along the jet (or fibre) trajectory during emulsion electrospinning. It was found that the evolution of the fibre core–shell structure was significantly different when different surfactants were used. If Span 80 was the surfactant, the water phase within the thick emulsion jet (or fibre) close to the Taylor cone existed in a discrete state whereas in ultrafine fibres collected beyond a certain distance from the Taylor cone, a mostly continuous water-phase core was observed. If sodium dodecyl sulfate was the surfactant, the core–shell structure in the thick jet (or fibre) was irregular but relatively continuous. A single core core–shell structure was eventually developed in ultrafine fibres. The core–shell structure in electrospun fibres and its evolution were also affected by the emulsion composition (e.g. polymer solution concentration, water-phase volume, and ion addition in the water phase).

scholarly journals Fabrication and characterization of distinctive ZnO/ZnS core–shell structures on silicon substratesviaa hydrothermal method

RSC Advances ◽  
2018 ◽  
Vol 8 (46) ◽  
pp. 26341-26348 ◽  
Author(s):  
Chin-Chi Cheng ◽  
Wei Chih Weng ◽  
Hsueh I Lin ◽  
Jo Lun Chiu ◽  
Hong-Yu Jhao ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Shell Structure ◽  
Shell Structures ◽  
Core Shell ◽  
Core Shell Structure ◽  
Fabrication And Characterization

A distinctive novel ZnO/ZnS core–shell structure on silicon was reported in this study.

Color Polymer Dispersed Liquid Crystal Device with Colored Core-Shell Structure

2015 ◽  
Vol 613 (1) ◽  
pp. 39-44 ◽  
Author(s):  
Dae Soo Kim ◽  
Dong Bin Yeo ◽  
Kyong Chan Heo ◽  
Jin Seog Gwag ◽  
Chul Gyu Jhun
Keyword(s):  
Liquid Crystal ◽  
Shell Structure ◽  
Core Shell ◽  
Liquid Crystal Device ◽  
Polymer Dispersed Liquid Crystal ◽  
Polymer Dispersed ◽  
Core Shell Structure
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