scholarly journals Imparting multi-functionality to covalent organic framework nanoparticles by the dual-ligand assistant encapsulation strategy

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Liang Chen ◽  
Wenxing Wang ◽  
Jia Tian ◽  
Fanxing Bu ◽  
Tiancong Zhao ◽  
...  
Keyword(s):  
Near Infrared ◽  
Core Shell ◽  
Tissue Penetration ◽  
Deep Tissue ◽  
Functional Nanoparticles ◽  
The Core ◽  
Shell Nanostructures ◽  
Potential Applications ◽  
Interfacial Growth ◽  
Promising Type

AbstractThe potential applications of covalent organic frameworks (COFs) can be further developed by encapsulating functional nanoparticles within the frameworks. However, the synthesis of monodispersed core@shell structured COF nanocomposites without agglomeration remains a significant challenge. Herein, we present a versatile dual-ligand assistant strategy for interfacial growth of COFs on the functional nanoparticles with abundant physicochemical properties. Regardless of the composition, geometry or surface properties of the core, the obtained core@shell structured nanocomposites with controllable shell-thickness are very uniform without agglomeration. The derived bowl-shape, yolk@shell, core@satellites@shell nanostructures can also be fabricated delicately. As a promising type of photosensitizer for photodynamic therapy (PDT), the porphyrin-based COFs were grown onto upconversion nanoparticles (UCNPs). With the assistance of the near-infrared (NIR) to visible optical property of UCNPs core and the intrinsic porosity of COF shell, the core@shell nanocomposites can be applied as a nanoplatform for NIR-activated PDT with deep tissue penetration and chemotherapeutic drug delivery.

Multimodal imaging and photothermal therapy were simultaneously achieved in the core–shell UCNR structure by using single near-infrared light

2017 ◽  
Vol 46 (36) ◽  
pp. 12147-12157 ◽  
Author(s):  
Chen Wang ◽  
Liangge Xu ◽  
Jiating Xu ◽  
Dan Yang ◽  
Bin Liu ◽  
...  
Keyword(s):  
Photothermal Therapy ◽  
Multimodal Imaging ◽  
Near Infrared ◽  
Infrared Light ◽  
Upconversion Nanoparticles ◽  
Core Shell ◽  
Imaging Diagnosis ◽  
The Core ◽  
Shell Nanostructures ◽  
Bio Imaging

Core–shell nanostructures consisting of plasmonic materials and lanthanide-doped upconversion nanoparticles (UCNPs) show promising applications in theranostics including bio-imaging, diagnosis and therapy.

scholarly journals Iron Based Core-Shell Structures as Versatile Materials: Magnetic Support and Solid Catalyst

Catalysts ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 72
Author(s):  
Christian Zambrzycki ◽  
Runbang Shao ◽  
Archismita Misra ◽  
Carsten Streb ◽  
Ulrich Herr ◽  
...  
Keyword(s):  
Water Purification ◽  
Functional Materials ◽  
Core Material ◽  
Solid Catalyst ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
The Core ◽  
Shell Nanostructures ◽  
Sio2 Shell ◽  
Iron Based

Core-shell materials are promising functional materials for fundamental research and industrial application, as their properties can be adapted for specific applications. In particular, particles featuring iron or iron oxide as core material are relevant since they combine magnetic and catalytic properties. The addition of an SiO2 shell around the core particles introduces additional design aspects, such as a pore structure and surface functionalization. Herein, we describe the synthesis and application of iron-based core-shell nanoparticles for two different fields of research that is heterogeneous catalysis and water purification. The iron-based core shell materials were characterized by transmission electron microscopy, as well as N2-physisorption, X-ray diffraction, and vibrating-sample magnetometer measurements in order to correlate their properties with the performance in the target applications. Investigations of these materials in CO2 hydrogenation and water purification show their versatility and applicability in different fields of research and application, after suitable individual functionalization of the core-shell precursor. For design and application of magnetically separable particles, the SiO2 shell is surface-functionalized with an ionic liquid in order to bind water pollutants selectively. The core requires no functionalization, as it provides suitable magnetic properties in the as-made state. For catalytic application in synthesis gas reactions, the SiO2-stabilized core nanoparticles are reductively functionalized to provide the catalytically active metallic iron sites. Therefore, Fe@SiO2 core-shell nanostructures are shown to provide platform materials for various fields of application, after a specific functionalization.

MnO2-Coated Porous Pt@CeO2 Core-Shell Nanostructures for Photoacoustic Imaging-Guided Tri-modal Cancer Therapy

Nanoscale ◽  
2021 ◽  
Author(s):  
Qing Xu ◽  
Danyang Li ◽  
Haijun Zhou ◽  
Biaoqi Chen ◽  
Junlei Wang ◽  
...  
Keyword(s):  
Cancer Therapy ◽  
Conversion Efficiency ◽  
Photoacoustic Imaging ◽  
Core Shell ◽  
Photothermal Conversion ◽  
The Core ◽  
Shell Nanostructures

We describe the synthesis of MnO2-coated porous Pt@CeO2 core–shell nanostructures (Pt@CeO2@MnO2) as a new theranostic nano-platform. The porous Pt cores endow the core–shell nanostructures with high photothermal conversion efficiency (80%)...

scholarly journals Near-IR-induced dissociation of thermally-sensitive star polymers

2017 ◽  
Vol 8 (3) ◽  
pp. 1815-1821 ◽  
Author(s):  
Yuqiong Dai ◽  
Hao Sun ◽  
Sunirmal Pal ◽  
Yunlu Zhang ◽  
Sangwoo Park ◽  
...  
Keyword(s):  
Near Infrared ◽  
Star Polymers ◽  
Tissue Penetration ◽  
Triggered Release ◽  
Deep Tissue ◽  
Responsive Systems ◽  
Nir Light ◽  
Near Ir ◽  
Triggering Events ◽  
Spatiotemporal Control

Responsive systems sensitive to near-infrared (NIR) light are promising for triggered release due to efficient deep tissue penetration of NIR irradiation relative to higher energy sources (e.g., UV), allowing for spatiotemporal control over triggering events with minimal potential for tissue damage.

Formation of bismuth iron oxide based core–shell structures and their dielectric, ferroelectric and magnetic properties

2019 ◽  
Vol 7 (5) ◽  
pp. 1280-1291 ◽  
Author(s):  
Alaka Panda ◽  
R. Govindaraj ◽  
R. Mythili ◽  
G. Amarendra
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Magnetic Properties ◽  
Iron Oxide ◽  
Shell Structures ◽  
Core Shell ◽  
Bismuth Iron Oxide ◽  
The Core ◽  
Shell Nanostructures ◽  
Transmission Electron

Bismuth and iron oxides subjected to ball milling followed by controlled annealing treatments showed the formation of core–shell nanostructures with Bi2Fe4O9 as the core and a shell of BiFeO3 and Bi25FeO40 phases as deduced based on the analysis of transmission electron microscopy results.

scholarly journals Enhanced UV Light Emission by Core-Shell Upconverting Particles Powering up TiO2 Photocatalysis in Near-Infrared Light

Catalysts ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 232
Author(s):  
Agnieszka Jarosz-Duda ◽  
Paulina O’Callaghan ◽  
Joanna Kuncewicz ◽  
Przemysław Łabuz ◽  
Wojciech Macyk
Keyword(s):  
Near Infrared ◽  
Light Emission ◽  
Uv Light ◽  
Protective Layer ◽  
Upconversion Emission ◽  
High Photocatalytic Activity ◽  
Infrared Light ◽  
Core Shell ◽  
The Core ◽  
Surface Luminescence

The core-shell NaYb0.99F4:Tm0.01@NaYF4 upconverting particles (UCPs) with a high UV emission to apply in NIR-driven photocatalysis were synthesized. The influence of the Yb3+ doping concentration in NaYxF4:Yb0.99−xTm0.01 core particles, and the role of the NaYF4 shell on the upconversion emission intensity of the UCPs were studied. The absorption of NIR light by the obtained UCPs was maximized by increasing the Yb3+ concentration in the core, reaching the maximum for Y3+-free particles (NaYb0.99F4:Tm0.01). Additionally, covering the NaYb0.99F4:Tm0.01 core with a protective layer of NaYF4 minimized the surface luminescence quenching, which significantly improved the efficiency of upconversion emission. The high intensity of the UV light emitted by the NaYb0.99F4:Tm0.01@NaYF4 under NIR irradiation resulted in a high photocatalytic activity of TiO2 (P25) mixed with the synthesized material.

scholarly journals Corroboration and efficacy of Magneto-Fluorescent (NiZnFe/CdS) Nanostructures Prepared using Differently Processed Core

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Dipti Rawat ◽  
P. B. Barman ◽  
Ragini Raj Singh
Keyword(s):  
Exchange Bias ◽  
Core Shell ◽  
Ferrite Core ◽  
The Core ◽  
Shell Nanostructures ◽  
Zn Ferrite ◽  
Different Temperatures ◽  
Cds Nanostructures ◽  
Multifunctional Nanostructures ◽  
The Comparative Study

Abstract The selected and controlled preparation of core@shell nanostructures, which unite the multiple functions of ferromagnetic Ni-Zn ferrite core and CdS shell in a single material with tuneable fluorescence and magnetic properties, have been proposed by the seed mediated aqueous growth process. The shell particle thickness and core of nanostructures were precisely tuned. Current work exhibits the comparative study of core@shell multifunctional nanostructures where core being annealed at two different temperatures. The core@shell nanostructure formation was confirmed by complementary structural, elemental, optical, magnetic and IR measurements. Optical and magnetic characterizations were performed to study elaborative effects of different structural combinations of core@shell nanostructures to achieve best configuration with high-luminescence and magnetic outcomes. The interface of magnetic/nonmagnetic NiZnFe2O4/CdS nanostructures was inspected. Unexpectedly, in some of the core@shell nanostructures presence of substantial exchange-bias was observed in spite of the non-magnetic nature of CdS QDs which is clearly an “optically-active” and “magnetically-inactive” material. Presence of “exchange-bias” was confirmed by the change in “magnetic-anisotropy” as well as shift in susceptibility derivative. Finally, successful formulation of stable and efficient core@shell nanostructures achieved, which shows no exchange-bias and shift. Current findings suggest that these magneto-fluorescent nanostructures can be used in spintronics; and drug delivery-diagnosis-imaging applications in nanomedicine field.

scholarly journals Core-Shell Structures of Upconversion Nanocrystals Coated with Silica for Near Infrared Light Enabled Optical Imaging of Cancer Cells

Micromachines ◽  
2018 ◽  
Vol 9 (8) ◽  
pp. 400 ◽  
Author(s):  
Kumbam Lingeshwar Reddy ◽  
Neeraj Prabhakar ◽  
Jessica Rosenholm ◽  
Venkata Krishnan
Keyword(s):  
Optical Imaging ◽  
Cancer Cells ◽  
Near Infrared ◽  
Shell Structures ◽  
Therapeutic Window ◽  
Luminescence Spectroscopy ◽  
Core Shell ◽  
Shell Nanostructures ◽  
Nir Light ◽  
Upconversion Nanocrystals

Optical imaging of cancer cells using near infrared (NIR) light is currently an active area of research, as this spectral region directly corresponds to the therapeutic window of biological tissues. Upconversion nanocrystals are photostable alternatives to conventional fluorophores. In our work, we have prepared upconversion nanocrystals of NaYF4:Yb/Er and encapsulated them in silica to form core-shell structures. The as-prepared core-shell nanostructures have been characterized for their structure, morphology, and optical properties using X-ray diffraction, transmission electron microscopy coupled with elemental mapping, and upconversion luminescence spectroscopy, respectively. The cytotoxicity examined using cell viability assay indicated a low level of toxicity of these core-shell nanostructures. Finally, these core-shell nanostructures have been utilized as photostable probes for NIR light enabled optical imaging of human breast cancer cells. This work paves the way for the development of advanced photostable, biocompatible, low-toxic core-shell nanostructures for potential optical imaging of biological cells and tissues.

Dye-free near-infrared surface-enhanced Raman scattering nanoprobes for bioimaging and high-performance photothermal cancer therapy

Nanoscale ◽  
2015 ◽  
Vol 7 (15) ◽  
pp. 6754-6761 ◽  
Author(s):  
Zhiming Liu ◽  
Binggang Ye ◽  
Mei Jin ◽  
Haolin Chen ◽  
Huiqing Zhong ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Photothermal Therapy ◽  
High Performance ◽  
Near Infrared ◽  
Surface Enhanced Raman Scattering ◽  
The Core ◽  
Shell Nanostructures ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Conducting polymer coated gold nanorods are synthesized via facile aqueous routes. The core-shell nanostructures can serve as novel theranostic nanoagents for near-infrared surface-enhanced Raman scattering imaging and high-performance photothermal therapy.

scholarly journals Synthesis and Luminescence Properties of Core-Shell-Shell Composites: SiO2@PMDA-Si-Tb@SiO2 and SiO2@PMDA-Si-Tb-phen@SiO2

2019 ◽  
Author(s):  
Lina Feng ◽  
Wenxian Li ◽  
Jinrong Bao ◽  
Yushang Zheng ◽  
Yilian Li ◽  
...  
Keyword(s):  
Organic Ligand ◽  
Silica Shell ◽  
Core Shell ◽  
Organic Complex ◽  
Chemical Route ◽  
The Core ◽  
Good Solubility ◽  
Potential Applications ◽  
Long Lifetime ◽  
Terbium Ion

Two novel core-shell composites SiO2@PMDA-Si-Tb, SiO2@PMDA-Si-Tb-phen with SiO2 as the core and terbium organic complex as the shell, were successfully synthesized. The terbium ion was coordinated with organic ligand forming terbium organic complex in the shell layer. The bi-functional organosilane ((HOOC)2C6H2(CONH(CH2)3Si(OCH2CH3)3)2 (abbreviated as PMDA-Si) was used as the first ligand and phen as the second ligand. Furthermore, the silica-modified SiO2@PMDA-Si-Tb@SiO2, SiO2@PMDA-Si-Tb-phen@SiO2 core-shell-shell composites were also synthesized by sol–gel chemical route. An amorphous silica shell was coated around the SiO2@PMDA-Si-Tb and SiO2@PMDA-Si-Tb-phen core-shell composites. The core-shell and core-shell-shell composites both exhibited excellent luminescence in solid state. The luminescence of core-shell-shell composites was stronger than that of core-shell composites. Meanwhile, an improved luminescence stability property for the core-shell-shell composites was found in the aqueous solution. The core-shell-shell composites exhibited bright luminescence, high stability, long lifetime, and good solubility, which may present potential applications in the field of bio-medical.

Sign in / Sign up

Export Citation Format

Share Document