Search results for "bioimaging."

showing 6 items of 16 documents

Facile synthesis of L-cysteine functionalized graphene quantum dots as a bioimaging and photosensitive agent

2021

Nowadays, a larger number of aggressive and corrosive chemical reagents as well as toxic solvents are used to achieve structural modification and cleaning of the final products. These lead to the production of residual, waste chemicals, which are often reactive, cancerogenic, and toxic to the environment. This study shows a new approach to the modification of graphene quantum dots (GQDs) using gamma irradiation where the usage of reagents was avoided. We achieved the incorporation of S and N atoms in the GQD structure by selecting an aqueous solution of L-cysteine as an irradiation medium. GQDs were exposed to gamma-irradiation at doses of 25, 50 and 200 kGy. After irradiation, the optical,…

PhotoluminescenceGeneral Chemical EngineeringQuantum yield02 engineering and technology010402 general chemistryPhotochemistrySettore FIS/07 - FISICA APPLICATA (A BENI CULTURALI AMBIENTALI BIOLOGIA E MEDICINA)01 natural sciencesArticlelaw.inventionchemistry.chemical_compoundlawGeneral Materials ScienceIrradiationbioimagingQD1-999Aqueous solutionatomic force microscopygraphene quantum dotsSinglet oxygenGraphene021001 nanoscience & nanotechnologygamma irradiation0104 chemical sciencesChemistrychemistryphotodynamic therapyQuantum dotReagentphotoluminescence0210 nano-technology
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Rapid and eco-friendly synthesis of graphene oxide-silica nanohybrids

2014

The increasing interest in Graphene oxide (GO) is due to many issues: the presence of both sp2-conjugated atoms and oxygen-containing functional groups provides a strong hydrophilicity and the possibility to further functionalize it with other molecules (i.e. π-π interactions covalent attachment etc.) [1]. Furthermore since the GO is biocompatible and noncytotoxic many studies have been recently focused on the development of GO-based nanodevices for bioimaging DNA detection drug delivery. Due to their low cytotoxicity and large internal surface area silica nanoparticles have been taken into account as promising material for biolabeling and drug loading/delivery. Particular consideration has recently been demonstrated for GO-silica composites because of the potentialities for electrical applications their chemical inertia and stability toward ions exposure. The possibility to combine the extraordinary properties of GO and silica offers several advantages for the realization of nanoprobes for biological applications and of biosensor [12]. The strategy for the fabrication of GO-nanosilica nanohybrids can be schematized as follows: (i) synthesis of GO by oxidizing graphite powder with the method described by Marcano et al. [3] (ii) Preparation of oxygen-loaded silica nanoparticles by thermal treatments in controlled atmosphere in order to induce high NIR emission at 1272 nm from high purity silica nanoparticles. (iii) preparation of GrO-silica nanohybrid films via rapid solvent casting in water. The nanohybrids were tested by XPS FTIR Raman analysis UV photoluminescence analysis TGA Zeta potential measurements electrical tests AFM and SEM. Several nanohybrids were prepared by combining two different typologies of GO and two different samples of silica.
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Fluorescent supramolecular hydrogels for biomedical applications

2019

hydrogels imidazolium salts supramolecular gels bioimaging anticancer activity
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Co-reductive fabrication of carbon nanodots with high quantum yield for bioimaging of bacteria

2018

A simple and straightforward synthetic approach for carbon nanodots (C-dots) is proposed. The strategy is based on a one-step hydrothermal chemical reduction with thiourea and urea, leading to high quantum yield C-dots. The obtained C-dots are well-dispersed with a uniform size and a graphite-like structure. A synergistic reduction mechanism was investigated using Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy. The findings show that using both thiourea and urea during the one-pot synthesis enhances the luminescence of the generated C-dots. Moreover, the prepared C-dots have a high distribution of functional groups on their surface. In this work, C-dots proved …

hydrothermalMaterials scienceGeneral Physics and AstronomyQuantum yield02 engineering and technologylcsh:Chemical technologyCarbon nanodots010402 general chemistrylcsh:Technology01 natural sciencesFull Research PaperHydrothermal circulationNanomaterialschemistry.chemical_compoundX-ray photoelectron spectroscopyNanotechnologylcsh:TP1-1185General Materials Sciencecarbon nanodotsbioimagingElectrical and Electronic EngineeringFourier transform infrared spectroscopylcsh:Sciencecollaborative reductionlcsh:TCondensed Matter::Mesoscopic Systems and Quantum Hall Effect021001 nanoscience & nanotechnologyBioimagingHydrothermallcsh:QC1-9990104 chemical sciencesNanoscienceChemical engineeringThioureachemistrySettore CHIM/09 - Farmaceutico Tecnologico ApplicativoCollaborative reductionUrealcsh:Q0210 nano-technologyLuminescencelcsh:PhysicsBeilstein Journal of Nanotechnology
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New supramolecular fluorescent NDI-gels as bioimaging materials

supramolecular gelfluorescenceSettore CHIM/06 - Chimica OrganicabioimagingSettore BIO/06 - Anatomia Comparata E Citologia
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Synthetic and natural polymer nanoparticles as bio-imaging and therapeutic agent vectors

2014

therapybioimagingpolymeric nanoparticle
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