Quenching of CdSe−ZnS Core−Shell Quantum Dot Luminescence by Water-Soluble Thiolated Ligands

2007 ◽  
Vol 111 (50) ◽  
pp. 18589-18594 ◽  
Author(s):  
Vladimir V. Breus ◽  
Colin D. Heyes ◽  
G. Ulrich Nienhaus
Keyword(s):  
Quantum Dot ◽  
Water Soluble ◽  
Core Shell

Water-Soluble Fluorescent CdTe/ZnSe Core/Shell Quantum Dot: Aqueous Phase Synthesis and Cytotoxicity Assays

2015 ◽  
Vol 15 (6) ◽  
pp. 4648-4652 ◽  
Author(s):  
Yansheng Li ◽  
Wenqian Wang ◽  
Dan Zhao ◽  
Peng Chen ◽  
Hongwu Du ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Aqueous Phase ◽  
Water Soluble ◽  
Core Shell ◽  
Phase Synthesis ◽  
Cytotoxicity Assays

Spectroscopy and Femtosecond Dynamics of Water Soluble Type I CdSe/ZnS Core–Shell Quantum Dot

2013 ◽  
Vol 5 (10) ◽  
pp. 1354-1363 ◽  
Author(s):  
Pallavi Singhal ◽  
Sachin Rawalekar ◽  
Sreejith Kaniyankandy ◽  
Hirendra N. Ghosh
Keyword(s):  
Quantum Dot ◽  
Water Soluble ◽  
Core Shell ◽  
Type I ◽  
Femtosecond Dynamics

A quantum dot-based fluorescence sensor for sensitive and enzymeless detection of creatinine

2016 ◽  
Vol 8 (30) ◽  
pp. 5911-5920 ◽  
Author(s):  
Narjes Tajarrod ◽  
Mohammad Kazem Rofouei ◽  
Majid Masteri-Farahani ◽  
Reza Zadmard
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Fluorescence Enhancement ◽  
Thioglycolic Acid ◽  
Fluorescence Sensor ◽  
Water Soluble ◽  
Core Shell

A schematic illustration of a sensitive creatinine probe using fluorescence enhancement of water-soluble thioglycolic acid capped ZnS:Mn/ZnS core/shell quantum dots.

scholarly journals Solubilization of Charged Porphyrins in Interpolyelectrolyte Complexes: A Computer Study

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 502
Author(s):  
Karel Šindelka ◽  
Zuzana Limpouchová ◽  
Karel Procházka
Keyword(s):  
Dissipative Particle Dynamics ◽  
Water Soluble ◽  
Coarse Grained ◽  
Core Shell ◽  
Computer Study ◽  
Interpolyelectrolyte Complex ◽  
The Core ◽  
Porphyrin Derivatives ◽  
Oppositely Charged ◽  
Positively Charged

Using coarse-grained dissipative particle dynamics (DPD) with explicit electrostatics, we performed (i) an extensive series of simulations of the electrostatic co-assembly of asymmetric oppositely charged copolymers composed of one (either positively or negatively charged) polyelectrolyte (PE) block A and one water-soluble block B and (ii) studied the solubilization of positively charged porphyrin derivatives (P+) in the interpolyelectrolyte complex (IPEC) cores of co-assembled nanoparticles. We studied the stoichiometric mixtures of 137 A10+B25 and 137 A10−B25 chains with moderately hydrophobic A blocks (DPD interaction parameter aAS=35) and hydrophilic B blocks (aBS=25) with 10 to 120 P+ added (aPS=39). The P+ interactions with other components were set to match literature information on their limited solubility and aggregation behavior. The study shows that the moderately soluble P+ molecules easily solubilize in IPEC cores, where they partly replace PE+ and electrostatically crosslink PE− blocks. As the large P+ rings are apt to aggregate, P+ molecules aggregate in IPEC cores. The aggregation, which starts at very low loadings, is promoted by increasing the number of P+ in the mixture. The positively charged copolymers repelled from the central part of IPEC core partially concentrate at the core-shell interface and partially escape into bulk solvent depending on the amount of P+ in the mixture and on their association number, AS. If AS is lower than the ensemble average ⟨AS⟩n, the copolymer chains released from IPEC preferentially concentrate at the core-shell interface, thus increasing AS, which approaches ⟨AS⟩n. If AS>⟨AS⟩n, they escape into the bulk solvent.

scholarly journals CdSe/ZnS Core-Shell-Type Quantum Dot Nanoparticles Disrupt the Cellular Homeostasis in Cellular Blood–Brain Barrier Models

2021 ◽  
Vol 22 (3) ◽  
pp. 1068
Author(s):  
Katarzyna Dominika Kania ◽  
Waldemar Wagner ◽  
Łukasz Pułaski
Keyword(s):  
Gene Expression ◽  
Quantum Dot ◽  
Blood Brain Barrier ◽  
Protein Gene ◽  
Brain Barrier ◽  
Core Shell ◽  
Cellular Homeostasis ◽  
Blood Brain ◽  
Shell Type ◽  
The Impact

Two immortalized brain microvascular endothelial cell lines (hCMEC/D3 and RBE4, of human and rat origin, respectively) were applied as an in vitro model of cellular elements of the blood–brain barrier in a nanotoxicological study. We evaluated the impact of CdSe/ZnS core-shell-type quantum dot nanoparticles on cellular homeostasis, using gold nanoparticles as a largely bioorthogonal control. While the investigated nanoparticles had surprisingly negligible acute cytotoxicity in the evaluated models, a multi-faceted study of barrier-related phenotypes and cell condition revealed a complex pattern of homeostasis disruption. Interestingly, some features of the paracellular barrier phenotype (transendothelial electrical resistance, tight junction protein gene expression) were improved by exposure to nanoparticles in a potential hormetic mechanism. However, mitochondrial potential and antioxidant defences largely collapsed under these conditions, paralleled by a strong pro-apoptotic shift in a significant proportion of cells (evidenced by apoptotic protein gene expression, chromosomal DNA fragmentation, and membrane phosphatidylserine exposure). Taken together, our results suggest a reactive oxygen species-mediated cellular mechanism of blood–brain barrier damage by quantum dots, which may be toxicologically significant in the face of increasing human exposure to this type of nanoparticles, both intended (in medical applications) and more often unintended (from consumer goods-derived environmental pollution).

scholarly journals Reversible Electrochemical Control over Photoexcited Luminescence of Core/Shell CdSe/ZnS Quantum Dot Film

2017 ◽  
Vol 12 (1) ◽  
Author(s):  
Bo Li ◽  
Meilin Lu ◽  
Weilong Liu ◽  
Xiaojun Zhu ◽  
Xing He ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Core Shell ◽  
Electrochemical Control
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