1,720,985 research outputs found
Surface Functionalized Multifunctional Gd<sub>2</sub>O<sub>3</sub>–Fluorescein Composite Nanorods for Redox Responsive Drug Delivery and Imaging Applications
No full textDevelopment of N and S heteroatom co-doped stable dual emitting carbon ink in aqueous media for sensing applications
No full textThis manuscript describes a simple chemical route to synthesize nitrogen and sulfur co-doped highly fluorescent carbon nanomaterials with dual emission fluorescence properties. The fluorescence intensity of the (N,S)-CNPs has been found to be highly responsive towards Hg2+ ions and the pH of the solution.</p
Evaluation of Mechanism on Selective, Rapid, and Superior Adsorption of Congo Red by Reusable Mesoporous α-Fe<sub>2</sub>O<sub>3</sub> Nanorods
No full textSurface Functionalized Multifunctional Gd<sub>2</sub>O<sub>3</sub>–Fluorescein Composite Nanorods for Redox Responsive Drug Delivery and Imaging Applications
No full textWe
have developed multifunctional Gd2O3–fluorescein
based magnetic–fluorescent composite nanorods with small, uniform
shape and size distribution and excellent colloidal stability for
multimodal imaging and redox responsive drug delivery applications.
Gd2O3 nanorods have been synthesized via high
temperature colloidal route, and composite development has been achieved
via one-step polyacrylate coating. This unique coating approach provides
controlled surface functional groups along with near zwitterionic
surface charge. For redox responsive drug loading, hydrophilic drug
daunorubicin has been modified with disulfide linkage and loaded with
the composite nanorods via covalent linkage. High drug loading (∼82%)
has been observed with excellent redox responsive release behavior.
These composite nanorods have been used as multimodal imaging probe,
for fluorescence imaging as well as magnetic resonance imaging (MRI).
Fluorescence imaging of the composite nanorods inside cancer-positive
KB cells exhibit efficient cellular internalization and drug delivery
with high cytotoxic effect. These surface functionalized composite
nanorods, having small size, excellent colloidal stability, high drug
loading capability, and redox responsive release behavior along with
multimodal imaging potential, can serve as a prospective nano-biomaterial
in drug delivery and imaging purposes
NDoped Fluorescent Carbon Nanosheets as a Label-Free Platform for Sensing Bisphenol Derivatives
No full textIn
this paper, we report the synthesis of fluorescent carbon nanosheets
from carbon nanoparticles produced from the burning of oil. This has
been achieved by nitric acid oxidation, which initiates the sheet
formation. We performed a detailed study of the formation mechanism,
which revealed that this oxidation technique stitches the small carbon
nanoparticles into a large sheet via nitrogen defect incorporation,
which, in turn, introduces strain in the nanosheet through pyridinic
or pyrazolic ring formation. The synthesis technique also introduces
several oxygenated surface functional groups, which provide excellent
colloidal stability to the nanosheets. Nitrogen incorporation also
assists in generating strong greenish-yellow fluorescence with ∼15%
quantum yield. A comprehensive study of the fluorescence origin reveals
that this emission has two different origins: one originating from
the excitation wavelength-dependent conjugation of sp2 clusters
in the sp3 backbone and the other originating from the
fixed n−π* transition of oxygenated and nitrogenated
defect states, which is excitation wavelength-independent. These nanosheets
are several microns in length and ∼1 to 2 nm in thickness.
We explored the application of these nanosheets for label-free sensing
of bisphenol derivatives as organic molecules and found that they
can interact with the π-ring structures of the nanosheets. Interestingly,
bisphenol derivatives interact selectively with the nanosheets, creating
a blue shift of the emission spectra. In addition to the high selectivity
for bisphenol detection, the detection limit was found to be as low
as a few nanomolar (limit of detection (LOD) ∼0.3 nM)
Hydrothermally synthesized fluorescent Zn 2 SnO 4 nanoparticles for dye sensitized solar cells
No full textFormation of Self-Assembled Defect-Free Zn<sub>2</sub>SnO<sub>4</sub> Nanostructures from Binary Oxides without the Kirkendall Effect
No full textIn
this Communication, we report
a facile approach to synthesize a technologically important oxide
Zn2SnO4 (ZTO) by a temperature-dependent solid-state
reaction without the Kirkendall effect. Single-phase defect-free ZTO
was formed upon calcination of a homogeneous 2:1 mixture of reactive
ZnO rods and SnO2 nanoparticles at 1000 °C. We also
observed interesting photocatalytic and photovoltaic properties from
the synthesized ZTO material
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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