Imaging the Atomic Position of Light Cations in a Porous Network and the Europium(III) Ion Exchange Capability by Aberration-Corrected Electron Microscopy

Those samples which swell rapidly when exposed to water are, at best, difficult to section for transmission electron microscopy. Some materials literally burst out of the embedding block with the first pass by the knife, and even the most rapid cutting cycle produces sections of limited value. Many ion exchange resins swell in water; some undergo irreversible structural changes when dried. We developed our embedding procedure to handle this type of sample, but it should be applicable to many materials that present similar sectioning difficulties.The purpose of our embedding procedure is to build up a cross-linking network throughout the sample, while it is in a water swollen state. Our procedure was suggested to us by the work of Rosenberg, where he mentioned the formation of a tridimensional structure by the polymerization of the GMA biproduct, triglycol dimethacrylate.

Download Full-text

Uniform synthesis of palladium species confined in a small-pore zeolite via full ion-exchange investigated by cryogenic electron microscopy

Journal of Materials Chemistry A ◽

10.1039/d1ta00468a ◽

2021 ◽

Author(s):

Yongwoo Kim ◽

Jongbaek Sung ◽

Sungsu Kang ◽

Jaeha Lee ◽

Min-Ho Kang ◽

...

Keyword(s):

Electron Microscopy ◽

Ion Exchange ◽

Small Pore ◽

Catalytic Applications

Uniformly dispersed palladium species in small-pore zeolite are successfully prepared for catalytic applications, and are investigated by advanced microscopic methods.

Download Full-text

PM-10Evaluation of Atomic Position Precision in Electrical Biasing In-situ Scanning Transmission Electron Microscopy Observation

Microscopy ◽

10.1093/jmicro/dfx065 ◽

2017 ◽

Vol 66 (suppl_1) ◽

pp. i22-i22

Author(s):

Yukio Sato ◽

Takashi Gondo ◽

Hiroya Miyazaki ◽

Ryo Teranishi ◽

Kenji Kaneko

Keyword(s):

Electron Microscopy ◽

Transmission Electron Microscopy ◽

Scanning Transmission Electron Microscopy ◽

Transmission Electron Microscopy Observation ◽

Atomic Position ◽

Microscopy Observation ◽

Transmission Electron ◽

Scanning Transmission ◽

Position Precision

Download Full-text

Effectiveness of Calcium Deficiency in Nanosized Hydroxyapatite for Removal of Fe(II), Cu(II), Ni(II) and Cr(VI) Ions from Aqueous Solutions

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.56.17 ◽

2019 ◽

Vol 56 ◽

pp. 17-27

Author(s):

Van Dat Doan ◽

Van Thuan Le ◽

Hoang Sinh Le ◽

Dinh Hien Ta ◽

Hoai Thuong Nguyen

Keyword(s):

Electron Microscopy ◽

Ion Exchange ◽

Aqueous Solutions ◽

Calcium Deficiency ◽

Exchange Mechanism ◽

Precipitation Method ◽

X Ray ◽

Transmission Electron ◽

Bet Method ◽

Langmuir Isotherm Model

In this work, nanosized calcium deficient hydroxyapatite (nCDHA) was synthesized by the precipitation method, and then utilized as an adsorbent for removal of Fe (II), Cu (II), Ni (II) and Cr (VI) ions from aqueous solutions after characterizing it by various techniques as scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX) and BET method. A possible structure of synthesized nCDHA was proposed. The adsorption study indicated that the adsorption equilibrium is well fitted with Langmuir isotherm model with the maximum adsorption capacities followed the order of Fe (II) > Cu (II) > Ni (II) > Cr (VI) with the values of 137.23, 128.02, 83.19 and 2.92 mg/g, respectively. The ion-exchange mechanism was dominant for the adsorption of metal ions onto nCDHA at initial metal concentrations lower than 0.01 mol/L. Along with the ion-exchange mechanism, there was an additional precipitation occurred on the surface of nCDHA in the case of Fe (II) and Cu (II) at initial concentrations higher than 0.01 mol/L.

Download Full-text