Field Of Silver Nanoparticles Research Articles

ORAL DELIVERY OF SILVER NANOPARTICLES – A REVIEW

Silver nanoparticles (NP) offer many applications in the science and technology. Oral delivery of such tiny particles results in enhanced drug absorption, reduction in dose, and minimize adverse effects. This review focuses on the mainly on the effects in the gastrointestinal tract along with its in vitro and in vivo studies carried on the silver NP. In this review, we compiled some of the extensive research in the field of silver NP, highlighting some of the most recent trends in the area. Search was carried in English language using Science direct, PubMed, and Google scholar search engines. The effects of silver NP on gastrointestinal tract such as absorption, distribution, metabolism, and elimination were compiled in this review. In addition, selected in vitro and in vivo studies related to the same are discussed. The accumulation of silver NP leading to Arginia condition also emphasized in the study. Silver NP and herbal silver NP in oral delivery can be exploited for the further safer and effective treatment.

Epitaxial InGaAs Quantum Dots in Al0.29Ga0.71As Matrix: Intensity and Kinetics of Luminescence in the Near Field of Silver Nanoparticles

Quantum dots of indium gallium arsenide buried in a thin layer of aluminum gallium arsenide were grown by means of molecular-beam epitaxy. The influence of silver nanoparticles grown on the surface of the semiconductor structure by vacuum thermal evaporation on photoluminescence of quantum dots was investigated. Photoluminescence spectra of quantum dots were obtained under stationary and pulsed excitation. The influence of silver nanoparticles exhibiting plasmon resonances on spectral distribution and kinetics of luminescence of the epitaxial quantum dots was studied.

The effect of plasmonic near field tuning on spontaneous emission intensity of dual emitting ZnO:Er3+ nanoparticles

The effect of plasmonic near field of silver nanoparticles (Ag NPs) on luminescence of Er3+ doped ZnO nanoparticles that exhibit dual mode excitation has been investigated. The surface plasmon resonance (SPR) energy is shown to play an important role in optical enhancements (under UV excitation) and quenching (under IR excitation) in ZnO:Er3+ NPs optimally conjugated with Ag NPs. Enhancement of total luminescence yield by 420% from ZnO:Er3+ NPs has been realized due to proximity of Ag NPs under UV excitation. The near field generated by exact Ag NP and their extinction properties were simulated through Finite difference time domain method and a direct correlation with observed fluorescence enhancement as well as quenching could be established.

Optical properties of semiconductor CdSe/ZnS quantum dots in the near field of silver nanoparticles

We experimentally investigate the influence of the near field of silver nanoparticles on the optical and photophysical properties of semiconductor CdSe/ZnS quantum dots. The samples are grown via deposition of metal onto dielectric substrates in a high vacuum chamber and are covered by a layer of quantum dots by means of centrifugation. We show that there is an increase in the quantum dot absorption in the near field of silver nanoparticles upon excitation in the plasmon band domain.

Using localized surface plasmons to modify the optical properties and conformational rearrangements of organic dye molecules

Optical properties of the molecular layers of cyanine dyes and their modification in a nearby field of silver nanoparticles on a sapphire substrate are investigated experimentally. Enhancement of the fluorescence and absorption intensity of organic molecules in the presence of silver nanoparticles is observed. The results from photomodifications of the molecular layers’ absorption properties with and without the presence of silver nanoparticles are described.