The role of a structure directing agent tetramethylammonium template in the initial steps of silicate oligomerization in aqueous solution

2015 ◽  
Vol 17 (34) ◽  
pp. 21810-21818 ◽  
Author(s):  
Thuat T. Trinh ◽  
Khanh-Quang Tran ◽  
Xue-Qing Zhang ◽  
Rutger A. van Santen ◽  
Evert Jan Meijer
Keyword(s):  
Aqueous Solution ◽  
Zeolite Synthesis ◽  
Structure Directing Agent ◽  
Initial Stage

The understanding of the formation of silicate oligomers in the initial stage of zeolite synthesis is of fundamental scientific and technological importance.

Reply to “Comment on 'Structure-Directing Role of Counterions in the Initial Stage of Zeolite Synthesis”

2011 ◽  
Vol 116 (1) ◽  
pp. 1622-1623 ◽  
Author(s):  
Xue-Qing Zhang ◽  
Thuat T. Trinh ◽  
Rutger A. van Santen ◽  
Antonius P. J. Jansen
Keyword(s):  
Zeolite Synthesis ◽  
Initial Stage

Structure-Directing Role of Counterions in the Initial Stage of Zeolite Synthesis

2011 ◽  
Vol 115 (19) ◽  
pp. 9561-9567 ◽  
Author(s):  
Xue-Qing Zhang ◽  
Thuat T. Trinh ◽  
Rutger A. van Santen ◽  
Antonius P. J. Jansen
Keyword(s):  
Zeolite Synthesis ◽  
Initial Stage

Positive Role of Synthesis Method and Hard Template on the Catalytic Performance of SAPO-34 in Methanol to Olefin Reaction.

2020 ◽  
Vol 23 ◽  
Author(s):  
Sajjad Rimaz ◽  
Reza Katal
Keyword(s):  
Particle Size ◽  
Synthesis Method ◽  
Catalytic Performance ◽  
Hard Template ◽  
Structure Directing Agent ◽  
Positive Role ◽  
Methanol To Olefin ◽  
Dg Method ◽  
Synthesis Procedure

: In the present study, SAPO-34 particles were synthesized using hydrothermal (HT) and dry gel (DG) conversion methods in the presence of diethyl amine (DEA) as an organic structure directing agent (SDA). Carbon nanotubes (CNT) were used as hard template in the synthesis procedure to introduce transport pores into the structures of the synthesized samples. The synthesized samples were characterized with different methods to reveal effects of synthesis method and using hard template on their structure and catalytic performance in methanol to olefin reaction (MTO). DG conversion method results in smaller particle size in comparison with hydrothermal method, resulting in enhancing catalytic performance. On the other side, using CNT in the synthesis procedure with DG method results in more reduction in particle size and formation of hierarchical structure which drastically improves catalytic performance.

scholarly journals A LONGITUDINAL INVESTIGATION OF EXPLICIT AND IMPLICIT AUDITORY PROCESSING IN L2 SEGMENTAL AND SUPRASEGMENTAL ACQUISITION

2021 ◽  
pp. 1-23
Author(s):  
Hui Sun ◽  
Kazuya Saito ◽  
Adam Tierney
Keyword(s):  
Adult Learners ◽  
Auditory Processing ◽  
First Language ◽  
Neural Representation ◽  
Immersion Experience ◽  
Initial Stage ◽  
Chinese Learners ◽  
Processing Ability ◽  
Speech Learning

Abstract Precise auditory perception at a subcortical level (neural representation and encoding of sound) has been suggested as a form of implicit L2 aptitude in naturalistic settings. Emerging evidence suggests that such implicit aptitude explains some variance in L2 speech perception and production among adult learners with different first language backgrounds and immersion experience. By examining 46 Chinese learners of English, the current study longitudinally investigated the extent to which explicit and implicit auditory processing ability could predict L2 segmental and prosody acquisition over a 5-month early immersion. According to the results, participants’ L2 gains were associated with more explicit and integrative auditory processing ability (remembering and reproducing music sequences), while the role of implicit, preconscious perception appeared to be negligible at the initial stage of postpubertal L2 speech learning.

Directing the Growth of Semiconductor Nanocrystals in Aqueous Solution: Role of Electrostatics

ChemPhysChem ◽  
2008 ◽  
Vol 9 (9) ◽  
pp. 1309-1316 ◽  
Author(s):  
Hao Zhang ◽  
Yi Liu ◽  
Chunlei Wang ◽  
Junhu Zhang ◽  
Haizhu Sun ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Semiconductor Nanocrystals

scholarly journals Electrochemiluminescence Study of Europium (III) Complex with Coumarin3-Carboxylic Acid

2008 ◽  
Vol 2008 ◽  
pp. 1-6 ◽  
Author(s):  
Stefan Lis ◽  
Krzysztof Staninski ◽  
Tomasz Grzyb
Keyword(s):  
Aqueous Solution ◽  
Spectral Analysis ◽  
Energy Transfer ◽  
Solid State ◽  
Carboxylic Acid ◽  
Elemental Analysis ◽  
Aluminium Electrode ◽  
The Eu

The europium (III) complex of coumarin-3-carboxylic acid (C3CA) has been prepared and characterized on the basis of elemental analysis, IR, and emission (photoluminescence and electrochemiluminescence) spectroscopy. The synthesised complex having a formula Eu was photophysically characterized in solution and in the solid state. Electrochemiluminescence, ECL, of the system containing the Eu(III)/C3CA complex was studied using an oxide-covered aluminium electrode. The goal of these studies was to show the possibility of the use of electrochemical excitation of the Eu(III) ion in aqueous solution for emission generation. The generated ECL emission was very weak, and therefore its measurements and spectral analysis were carried out with the use of cut-off filters method. The studies proved a predominate role of the ligand-to-metal energy transfer (LMET) in the generated ECL.

Incorporation and Role of Nitrogen During Oxynitridation of Silicon Studied by Photoelectron Spectroscopy

1999 ◽  
Vol 567 ◽  
Author(s):  
Masayuki Suzuki ◽  
Yoji Saito
Keyword(s):  
Photoelectron Spectroscopy ◽  
High Vacuum ◽  
Oxide Films ◽  
Silicon Surfaces ◽  
Gaseous Mixtures ◽  
X Ray ◽  
Initial Stage ◽  
Thermal Stability Of

ABSTRACTWe tried direct oxynitridation of silicon surfaces by remote-plasma-exited nitrogen and oxygen gaseous mixtures at 700°C in a high vacuum. The oxynitrided surfaces were investigated with in-situ X-ray photoelectron spectroscopy. With increase of the oxynitridation time, the surface density of nitrogen gradually increases, but that of oxygen shows nearly saturation behavior after the rapid increase in the initial stage. We also annealed the grown oxynitride and oxide films to investigate the role of the contained nitrogen. The desorption rate of oxygen from the oxynitride films is much less than that from oxide films. We confirmed that nitrogen stabilizes the thermal stability of these oxynitride films.

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