Morphology-Dependent Phase Selectivity of Cobalt Sulfide during Nanoparticle Cation Exchange Reactions

2021 ◽  
Author(s):  
Auston G. Butterfield ◽  
Connor R. McCormick ◽  
Joseph M. Veglak ◽  
Raymond E. Schaak
Keyword(s):  
Cation Exchange ◽  
Cobalt Sulfide ◽  
Exchange Reactions ◽  
Phase Selectivity

Determinants of crystal structure transformation of ionic nanocrystals in cation exchange reactions

Science ◽  
2021 ◽  
Vol 373 (6552) ◽  
pp. 332-337
Author(s):  
Zhanzhao Li ◽  
Masaki Saruyama ◽  
Toru Asaka ◽  
Yasutomi Tatetsu ◽  
Toshiharu Teranishi
Keyword(s):  
Crystal Structure ◽  
Cation Exchange ◽  
Cobalt Sulfide ◽  
Hexagonal Prism ◽  
Structure Transformation ◽  
Exchange Reactions ◽  
Reaction Conditions ◽  
Hexagonal Close Packed ◽  
Crystal Structure Transformation ◽  
Thermodynamic Instability

Changes in the crystal system of an ionic nanocrystal during a cation exchange reaction are unusual yet remain to be systematically investigated. In this study, chemical synthesis and computational modeling demonstrated that the height of hexagonal-prism roxbyite (Cu1.8S) nanocrystals with a distorted hexagonal close-packed sulfide anion (S2−) sublattice determines the final crystal phase of the cation-exchanged products with Co2+ [wurtzite cobalt sulfide (CoS) with hexagonal close-packed S2– and/or cobalt pentlandite (Co9S8) with cubic close-packed S2–]. Thermodynamic instability of exposed planes drives reconstruction of anion frameworks under mild reaction conditions. Other incoming cations (Mn2+, Zn2+, and Ni2+) modulate crystal structure transformation during cation exchange reactions by various means, such as volume, thermodynamic stability, and coordination environment.

Facile Synthesis of Colloidal Zn3X2 (X = P, As) Quantum Dots: Transformation into (InyZn1-y)3X2 via Cation-Exchange Reactions

Nanoscale ◽  
2021 ◽  
Author(s):  
Sang-Wook Kim ◽  
Seungmin Baek ◽  
Jin-Soo Ha ◽  
Sungwoo Kim
Keyword(s):  
Quantum Dots ◽  
Cation Exchange ◽  
Environmentally Friendly ◽  
Exchange Reactions ◽  
Facile Synthesis ◽  
Organometallic Precursor

We firstly synthesized uniform Zn3X2 (X=P, As) quantum dots (QDs) using stable, environmentally friendly zinc precursor instead of organometallic precursor such as Me2Zn or Et2Zn, and controlled the QD size...

scholarly journals Exchange Characteristics of Lead, Zinc, and Cadmium in Selected Tropical Soils

2014 ◽  
Vol 2014 ◽  
pp. 1-7
Author(s):  
Tope O. Bolanle-Ojo ◽  
Abiodun D. Joshua ◽  
Opeyemi A. Agbo-Adediran ◽  
Ademola S. Ogundana ◽  
Kayode A. Aiyeyika ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Tropical Soils ◽  
Exchange Capacity ◽  
Exchange Reactions ◽  
Soil System ◽  
Soil Systems ◽  
Wide Range ◽  
Lead Zinc ◽  
High Base

Conducting binary-exchange experiments is a common way to identify cationic preferences of exchangeable phases in soil. Cation exchange reactions and thermodynamic studies of Pb2+/Ca2+, Cd2+/Ca2+, and Zn2+/Ca2+were carried out on three surface (0–30 cm) soil samples from Adamawa and Niger States in Nigeria using the batch method. The physicochemical properties studies of the soils showed that the soils have neutral pH values, low organic matter contents, low exchangeable bases, and low effective cation exchange capacity (mean: 3.27 cmolc kg−1) but relatively high base saturations (≫50%) with an average of 75.9%. The amount of cations sorbed in all cases did not exceed the soils cation exchange capacity (CEC) values, except for Pb sorption in the entisol-AD2 and alfisol-AD3, where the CEC were exceeded at high Pb loading. Calculated selectivity coefficients were greater than unity across a wide range of exchanger phase composition, indicating a preference for these cations over Ca2+. TheKeqvalues obtained in this work were all positive, indicating that the exchange reactions were favoured and equally feasible. These values indicated that the Ca/soil systems were readily converted to the cation/soil system. The thermodynamic parameters calculated for the exchange of these cations were generally low, but values suggest spontaneous reactions.

ChemInform Abstract: CATION EXCHANGE REACTIONS OF THE MICA-LIKE POTASSIUM NIOBATE K4NB6O17

1976 ◽  
Vol 7 (40) ◽  
pp. no-no
Author(s):  
GERHARD LAGALY ◽  
KLAUS BENEKE
Keyword(s):  
Cation Exchange ◽  
Potassium Niobate ◽  
Exchange Reactions

scholarly journals Tuning infrared plasmon resonances in doped metal-oxide nanocrystals through cation-exchange reactions

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Zeke Liu ◽  
Yaxu Zhong ◽  
Ibrahim Shafei ◽  
Ryan Borman ◽  
Soojin Jeong ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Cation Exchange ◽  
Exchange Reactions ◽  
Plasmon Resonances

Cation Exchange Reactions of Soil and Specimen Vermiculites

1967 ◽  
Vol 31 (3) ◽  
pp. 361-365 ◽  
Author(s):  
J. D. Rhoades
Keyword(s):  
Cation Exchange ◽  
Exchange Reactions

Binary Cation-Exchange Reactions

1998 ◽  
Vol 46 (2) ◽  
pp. 215-218 ◽  
Author(s):  
Ronald K. Stoessell
Keyword(s):  
Cation Exchange ◽  
Exchange Reactions

Rates and mechanisms of the intermolecular cation-exchange reactions of sodium tetraphenylboron with sodium-nitrobenzene and with sodium-p-nitrobenzonitrile

1984 ◽  
Vol 22 (7) ◽  
pp. 456-458 ◽  
Author(s):  
Neil M. Atherton ◽  
Peter H. Blustin ◽  
Ceris A. Humphreys ◽  
Ahmed S. Shalabi
Keyword(s):  
Cation Exchange ◽  
Exchange Reactions ◽  
Sodium Tetraphenylboron

Reactions of smectites with binuclear oxobridged iron complexes of N-alkyl-N,N-bis (2-pyridylmethyl)amines

Clay Minerals ◽  
1998 ◽  
Vol 33 (1) ◽  
pp. 35-42 ◽  
Author(s):  
S. Dick ◽  
A. Weiss
Keyword(s):  
Cation Exchange ◽  
Iron Complexes ◽  
Layer Charge ◽  
Exchange Reactions ◽  
Internal Surfaces ◽  
Small Complex ◽  
Interlayer Region

AbstractCationic binuclear oxo- and carboxylate bridged Fe(III) complexes of N-alkyl-N,Nbis(2-pyridylmethyl)amines are introduced into the interlayer region of smectites by cation exchange reactions. The reaction can be divided into three steps. After a predominant loading of external surfaces, cation exchange sites at internal surfaces react, accompanied by considerable stmctaral expansion. Both reaction stages belong to the steep section of the exchange isotherms. At a certain loading, which depends on the complex substituents and the layer charge of the smectite, the isotherms become flat. With bulky shaped complex cations and highly charged smectites, exchange is not quantitative; vermiculite-type minerals show a very small complex uptake. For this behaviour, both thermodynamic and kinetic reasons must be considered. From these results the number of cation exchange positions at external surfaces of smectite crystals may be estimated.

scholarly journals Understanding the Journey of Dopant Copper Ions in Atomically Flat Colloidal Nanocrystals of CdSe Nanoplatelets Using Partial Cation Exchange Reactions

2018 ◽  
Vol 30 (10) ◽  
pp. 3265-3275 ◽  
Author(s):  
Manoj Sharma ◽  
Murat Olutas ◽  
Aydan Yeltik ◽  
Yusuf Kelestemur ◽  
Ashma Sharma ◽  
...  
Keyword(s):  
Cation Exchange ◽  
Copper Ions ◽  
Colloidal Nanocrystals ◽  
Exchange Reactions ◽  
Atomically Flat
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