An original method was proposed to reduce the quenching of the NIR fluorescence of colloidal solutions of 0.1 at. % Nd: LaF nanoparticles (NPs) synthesized by aqueous co-precipitation method followed by hydrothermal microwave treatment. For this, an aqueous colloidal solution of NPs was precipitated by centrifugation and dissolved in the same volume of DMSO. The kinetics of static fluorescence quenching of Nd donors of doped NPs dispersed in two solvents was analyzed to determine and to compare the concentrations of OH- quenching acceptors uniformly distributed throughout the volume of the NPs. The dependences of the relative fluorescence quantum yield of colloidal solutions on the concentration of OH- groups in the NPs were calculated and were also used to determine concentration of acceptors in the volume of NPs in different solvents. It was found that the concentration of OH- groups in NPs dispersed in DMSO is almost two times lower than in NPs dispersed in water. This gives an almost two-fold increase in the relative fluorescence quantum yield for the former. The sizes of synthesized NPs were monitored by common TEM and by applying a rapid procedure based on optical visualization of the trajectories of the Brownian motion of NPs in solution using a laser ultramicroscope. The use of two different methods made it possible to obtain more detailed information about the studied NPs.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9655414 | PMC |
| http://dx.doi.org/10.3390/nano12213749 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Issuing of albumin solutions to Danish public hospitals-A nationwide, retrospective, observational study based on pharmacy data from 2022.
Acta Anaesthesiol Scand
February 2025
Department of Intensive Care, Copenhagen University Hospital - Rigshospitalet, Copenhagen, Denmark.
Background: Intravenous albumin is used for resuscitation and substitution but is not supported by high-certainty evidence. As clinical practice likely varies, we aimed to describe the issuing of albumin solutions across Danish public hospitals.
Methods: We assessed issuing of intravenous albumin solutions (5% and 20%) to all Danish public hospitals in 2022.
Advancements in GelMA bioactive hydrogels: Strategies for infection control and bone tissue regeneration.
Theranostics
January 2025
Department of Endodontics, Stomatological Hospital, School of Stomatology, Southern Medical University, Guangzhou, China.
Infectious bone defects present a significant clinical challenge, characterized by infection, inflammation, and subsequent bone tissue destruction. Traditional treatments, including antibiotic therapy, surgical debridement, and bone grafting, often fail to address these defects effectively. However, recent advancements in biomaterials research have introduced innovative solutions for managing infectious bone defects.
View Article and Find Full Text PDF2,3:6,7‒Naphthalenediimide-based Chiral Triangular Macrocycle: Self-Assembled Helix, Outer π-surface Directed Co-assembly and Circularly Polarized Luminescence.
Angew Chem Int Ed Engl
January 2025
Institute of Chemistry, CAS, Laboratory of Colloid and Interface Scie, Zhong Guancun, 100080, Beijing, CHINA.
Here, we report the synthesis and self-assembly of a novel chiral 2,3:6,7‒naphthalenediimide-based triangular macrocycle (NDI-∆) and their chiroptical properties. The enantiomeric NDI-∆ is synthesized by condensation of (RR) or (SS)-trans-1,2-cyclohexanediamine and 2,3,6,7-naphthalenetetracarboxylic 2,3:6,7-dianhydride, in which the chirality of the macrocycles is controlled by the diamine. With the rigid outer π-surface, the macrocycle showed unique chiroptical properties and self-assembly modes.
View Article and Find Full Text PDFRevealing critical roles of alkaline passivation layer on garnet surface toward poly(vinylidene fluoride)-based composite electrolytes for solid-state lithium batteries.
J Colloid Interface Sci
December 2024
College of Physics, Qingdao University, Qingdao 266071, China. Electronic address:
The poly(vinylidene fluoride) (PVDF) has been deemed as an appealing matrix for solid polymer electrolytes due to its wide electrochemical window and excellent thermal stability. Further incorporation with garnet filler endows PVDF-based electrolyte with increased ionic conductivity and mechanical strength. However, the spontaneous formation of alkaline layer containing LiOH/LiCO on garnet surface cannot be neglected, concerning its low ionic conductivity combined with the destructive effect on electrochemical performance of PVDF-based composite electrolytes.
View Article and Find Full Text PDFThe influence of solute concentration and filtration on mesoscale clusters of flufenamic acid, a typical pharmaceutical compound, in ethanol.
J Colloid Interface Sci
December 2024
Department of Chemical Sciences, SSPC, the Research Ireland Centre for Pharmaceuticals, Bernal Institute, University of Limerick, V94 T9PX, Ireland. Electronic address:
Hypothesis: It is hypothesised in this work that mesoscale clusters will be present in both undersaturated and supersaturated solutions of organic pharmaceutical molecules. These clusters, being loose aggregates, could be sensitive to shear forces experienced during filtration. Thus, comparing the behaviour of these clusters alongside nanoparticles during filtration-an important sample treatment parameter during crystallization-will elucidate qualitative differences from solid, crystalline nanoparticles of similar size.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!