scholarly journals Modeling Electronic Polarizability Changes in the Course of a Magnesium Ion Water Ligand Exchange Process

2015 ◽  
Vol 119 (32) ◽  
pp. 10275-10286 ◽  
Author(s):  
Igor V. Kurnikov ◽  
Maria Kurnikova
Keyword(s):  
Ligand Exchange ◽  
Exchange Process ◽  
Magnesium Ion ◽  
Water Ligand ◽  
Electronic Polarizability

scholarly journals Recent Research Progress in Surface Ligand Exchange of PbS Quantum Dots for Solar Cell Application

2020 ◽  
Vol 10 (3) ◽  
pp. 975 ◽  
Author(s):  
Hyung Ryul You ◽  
Jin Young Park ◽  
Duck Hoon Lee ◽  
Younghoon Kim ◽  
Jongmin Choi
Keyword(s):  
Quantum Dots ◽  
Solid State ◽  
Ligand Exchange ◽  
Exchange Process ◽  
Surface States ◽  
Solution Phase ◽  
Research Progress ◽  
Solar Cell Application ◽  
Exchange Processes ◽  
Particle Size And Shape

Colloidal quantum dots (CQDs) are considered as next-generation semiconductors owing to their tunable optical and electrical properties depending on their particle size and shape. The characteristics of CQDs are mainly governed by their surface chemistry, and the ligand exchange process plays a crucial role in determining their surface states. Worldwide studies toward the realization of high-quality quantum dots have led to advances in ligand exchange methods, and these procedures are usually carried out in either solid-state or solution-phase. In this article, we review recent advances in solid-state and solution-phase ligand exchange processes that enhance the performance and stability of lead sulfide (PbS) CQD solar cells, including infrared (IR) CQD photovoltaics.

Multifunctional silicone nanocomposites for advanced LED encapsulation

2013 ◽  
Vol 1547 ◽  
pp. 161-166 ◽  
Author(s):  
Ying Li ◽  
Peng Tao ◽  
Richard W. Siegel ◽  
Linda S. Schadler
Keyword(s):  
Ligand Exchange ◽  
High Efficiency ◽  
Extraction Efficiency ◽  
Exchange Process ◽  
Polymer Brush ◽  
High Refractive Index ◽  
Inorganic Nanoparticles ◽  
Light Extraction Efficiency ◽  
Yellow Emission ◽  
Color Conversion

ABSTRACTThe addition of high refractive index (RI) inorganic nanoparticles (NPs) to LED encapsulation materials can lead to higher light extraction efficiency. In addition, the NPs can be carriers for additional functionality such as color conversion. Using a simple “grafting-to” approach, bimodal polydimethylsiloxane (PDMS) brushes were grafted onto high-RI ZrO2 NPs. Subsequently, an organic phosphor, 6-[fluorescein-5(6)-carboxamido]hexanoic acid (FCHA), was attached onto the PDMS-grafted ZrO2 NPs via a facile ligand exchange process. The bimodal polymer brush design enables homogenous dispersion of the surface functionalized NPs within the silicone matrix. The functionalized NPs with ∼53 wt% ZrO2 core have a ∼0.08 higher RI than neat silicone, and the NP-filled silicone nanocomposites exhibit a transparency of ∼ 90% in the 550-800 nm wavelength range. In addition, the nanocomposites could be excited at a wavelength around 455 nm by a blue LED and undergo secondary yellow emission at around 571 nm. It is expected that the prepared nanocomposites can be used as high-efficiency, non-scattering, color-tuned materials for advanced LED encapsulation.

Ligand-exchange mechanism: new insight into solid-phase extraction of uranium based on a combined experimental and theoretical study

2015 ◽  
Vol 17 (11) ◽  
pp. 7214-7223 ◽  
Author(s):  
Yin Tian ◽  
Jia Fu ◽  
Yi Zhang ◽  
Kecheng Cao ◽  
Chiyao Bai ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Ligand Exchange ◽  
Theoretical Study ◽  
Solid Phase ◽  
Exchange Process ◽  
Water Molecules ◽  
Phase Extraction ◽  
Extraction Mechanism ◽  
Coordinated Water ◽  
Insight Into

The extraction mechanism is an exchange process between the ligands on Urea-GO and the coordinated water molecules of uranyl.

Engineering the surface chemistry of lead chalcogenide nanocrystal solids to enhance carrier mobility and lifetime in optoelectronic devices

2017 ◽  
Vol 53 (4) ◽  
pp. 728-731 ◽  
Author(s):  
S. J. Oh ◽  
D. B. Straus ◽  
T. Zhao ◽  
J.-H. Choi ◽  
S.-W. Lee ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Chemistry ◽  
Ligand Exchange ◽  
Carrier Mobility ◽  
Exchange Process ◽  
Optoelectronic Devices ◽  
Lead Chalcogenide

We develop a hybrid ligand exchange process to enhance both mobility and lifetime of carriers in nanocrystal thin films.

A Proton Magnetic Resonance Study of Ligand Exchange on the Hexakis-(N, N-dimethylformamide)magnesium(II) Ion

1979 ◽  
Vol 32 (4) ◽  
pp. 715 ◽  
Author(s):  
DL Pisaniello ◽  
SF Lincoln
Keyword(s):  
Reaction Mechanism ◽  
Ligand Exchange ◽  
Kinetic Data ◽  
Proton Magnetic Resonance ◽  
Exchange Process ◽  
Bond Rupture ◽  
Magnetic Resonance Study ◽  
Rate Determining Step ◽  
Proton Magnetic Resonance Study ◽  
Similar Kinetic

The rate of ligand exchange on the hexakis(N, N-dimethylformamide) magnesium(II) ion, [Mg(dmf)6]2+, in CD2Cl2 and (CD3)2CO diluents is found to be virtually independent of the concentration of free dmf. This is consistent with a reaction mechanism in which bond rupture is the major factor in the rate-determining step for the exchange process. For a solution in which [Mg(dmf)62+],[dmf] and [CD2Cl,] are 0.0768, 0.397 and 13.9 mol dm-3 respectively, kex(215 K) = 23.5 � 3.2 s-1, ΔH‡ = 77.8 + 3.0 kJ mol-1 and ΔS‡ = l46 � 14 J K-1 mol-1, and similar kinetic parameters characterize other CD2Cl2 solutions. In (CD3)2CO diluent the ligand-exchange process is characterized by smaller ΔH‡ and ΔS‡ values. These data are discussed in conjunction with kinetic data reported for other magnesium(II) systems.

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