Encapsulation of TOPO stabilized NaYF4:Er3+,Yb3+ nanoparticles in biocompatible nanocarriers: Synthesis, optical properties and colloidal stability

2017 ◽  
Vol 532 ◽  
pp. 556-563 ◽  
Author(s):  
Urszula Bazylińska ◽  
Dominika Wawrzyńczyk
Keyword(s):  
Optical Properties ◽  
Colloidal Stability

scholarly journals Synthesis conditions influencing formation of MAPbBr3 perovskite nanoparticles prepared by the ligand-assisted precipitation method

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Anna Jancik Prochazkova ◽  
Markus Clark Scharber ◽  
Cigdem Yumusak ◽  
Ján Jančík ◽  
Jiří Másilko ◽  
...  
Keyword(s):  
Optical Properties ◽  
Colloidal Stability ◽  
Precursor Solution ◽  
Solvent System ◽  
Precipitation Method ◽  
Colloidal Solutions ◽  
Capping Agents ◽  
Synthesis Conditions ◽  
Perovskite Nanoparticles ◽  
Selection Of

Abstract This work reports on an optimized procedure to synthesize methylammonium bromide perovskite nanoparticles. The ligand-assisted precipitation synthetic pathway for preparing nanoparticles is a cost-effective and promising method due to its ease of scalability, affordable equipment requirements and convenient operational temperatures. Nevertheless, there are several parameters that influence the resulting optical properties of the final nanomaterials. Here, the influence of the choice of solvent system, capping agents, temperature during precipitation and ratios of precursor chemicals is described, among other factors. Moreover, the colloidal stability and stability of the precursor solution is studied. All of the above-mentioned parameters were observed to strongly affect the resulting optical properties of the colloidal solutions. Various solvents, dispersion media, and selection of capping agents affected the formation of the perovskite structure, and thus qualitative and quantitative optimization of the synthetic procedure conditions resulted in nanoparticles of different dimensions and optical properties. The emission maxima of the nanoparticles were in the 508–519 nm range due to quantum confinement, as confirmed by transmission electron microscopy. This detailed study allows the selection of the best optimal conditions when using the ligand-assisted precipitation method as a powerful tool to fine-tune nanostructured perovskite features targeted for specific applications.

scholarly journals Influence of the stabilizing ligand on the quality, signal-relevant optical properties, and stability of near-infrared emitting Cd1−xHgxTe nanocrystals

2014 ◽  
Vol 2 (25) ◽  
pp. 5011-5018 ◽  
Author(s):  
S. Leubner ◽  
R. Schneider ◽  
A. Dubavik ◽  
S. Hatami ◽  
N. Gaponik ◽  
...  
Keyword(s):  
Optical Properties ◽  
Growth Kinetics ◽  
Colloidal Stability ◽  
Near Infrared ◽  
Quantum Yields ◽  
Quality Signal ◽  
Thiol Ligands

Influence of different thiol ligands on growth kinetics, photoluminescence quantum yields, and colloidal stability of near-infrared emitting CdHgTe nanocrystals is systematically studied.

scholarly journals Study of the colloidal stability and optical properties of sunscreen creams

2019 ◽  
Vol 44 (2) ◽  
pp. 26 ◽  
Author(s):  
Gustavo Pereira Saito ◽  
Mariana Bizari ◽  
Marco Aurélio Cebim ◽  
Marcos Antonio Correa ◽  
Miguel Jafelicci Junior ◽  
...  
Keyword(s):  
Optical Properties ◽  
Absorption Spectra ◽  
Colloidal Stability ◽  
Time Dependent ◽  
Water Dispersion ◽  
Cosmetic Product ◽  
Critical Wavelength ◽  
Oil Water ◽  
Cielab Color

Sunscreen formulations containing inorganic/organic filters or mixture of them were synthesized by oil/water dispersion. The viscosity measurements show that sunscreen formulations are time-dependent non-newtonian fluids. In the CIELab color diagram, the white and/or beige colors presented by formulations do not compromise the aesthetics of the cosmetic product. UV-VIS absorption spectra show that sunscreen creams have high UV shielding ability, mainly the formulations containing inorganic and organic filters mixtures, which provide in vitro SPF and critical wavelength values recommended for UV protection.

scholarly journals Purification of quantum dot-based bioprobes with a salting out strategy

2022 ◽  
Author(s):  
Zhi-Liang Chen ◽  
Jia-quan Xu
Keyword(s):  
Optical Properties ◽  
Quantum Dot ◽  
Colloidal Stability ◽  
Target Recognition ◽  
Salting Out

A salting out strategy is reported for purification of IgG-conjugated QD (IgG-QD) bioprobes. The optical properties, target recognition, and colloidal stability of the purified IgG-QD were commendably maintained after salting out.

Protein stabilized Au nanoclusters: spectral properties and photostability

2016 ◽  
Vol 56 (1) ◽  
Author(s):  
Vilius Poderys ◽  
Marija Matulionytė-Safinė ◽  
Dainius Rupšys ◽  
Ričardas Rotomskis
Keyword(s):  
Optical Properties ◽  
Spectral Properties ◽  
Colloidal Stability ◽  
Coating Layer ◽  
Gold Nanoclusters ◽  
Therapeutic Agents ◽  
Hypsochromic Shift ◽  
Au Nanoclusters ◽  
Nanoparticle Coating ◽  
Delivered Dose

Bovine serum albumin stabilized gold nanoclusters (BSA-Au nanoclusters) have been widely studied due to their possible applications in biomedicine as sensors, fluorescent or multi-modality markers, and therapeutic agents. Synthesis and optical properties of these nanoclusters have been extensively investigated; however, there is still very little data on photostability of BSA-Au nanoclusters. Photostability of BSA-Au nanoclusters is of major importance for a variety of applications, such as material sensing and fluorescence imaging. Herein we demonstrate that after synthesis the BSA-Au solution has two photoluminescence (PL) bands peaking at 468 and 660 nm. Nevertheless, a different behaviour of the PL bands at 468 and 660 nm upon irradiation indicates that only band at 660 nm is related to PL of Au nanoclusters. BSA-Au nanoclusters exhibit great colloidal stability and do not undergo irreversible changes when heated up to 65 °C. However, irradiation of BSA-Au nanoclusters causes a wavelength dependent decrease of intensity and a hypsochromic shift of the PL band at 660 nm which is proportional to the delivered dose. The shift of the PL band at 660 nm could occur due to loss of several gold atoms in Au nanoclusters and/or due to deterioration of a nanoparticle coating layer. We have also demonstrated that the photostability of BSA-Au nanoclusters increases in the cell growth medium.

Coating matters: the influence of coating materials on the optical properties of gold nanoparticles

Nanophotonics ◽  
2012 ◽  
Vol 1 (3-4) ◽  
pp. 199-220 ◽  
Author(s):  
Munish Chanana ◽  
Luis M. Liz-Marzán
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
Colloidal Stability ◽  
Essential Element ◽  
Resonance Wavelength ◽  
Coating Material ◽  
Synthetic Approach ◽  
Primary Role ◽  
Coating Materials ◽  
Synthesis Procedure

AbstractAn essential element in the synthesis of nanomaterials based on gold nanoparticles comprises the control over parameters such as size, shape and composition, due to their strong influence on the properties of the particles. However, it is the coating material which often plays the primary role in tuning the size, morphology, and even plasmon resonance wavelength or mode multiplicity, as well as colloidal stability and functional versatility, ultimately determining the physical, chemical, optical, electronic and catalytic properties of the nanoparticles. Therefore, it is utterly important to select the adequate wet chemistry synthetic approach with the most suitable coating material for the preparation of gold nanoparticles with the desired requirements. Within this context, this review is focused on describing various types of organic and inorganic coating materials for gold nanoparticles that may notably affect their optical properties by either directly influencing the synthesis procedure or by changing their chemical and physical properties upon post-synthetic modifications, such that they exhibit novel and useful optical properties.

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