State-specific dynamics ofD2desorption from Cu(111): The role of molecular rotational motion in activated adsorption-desorption dynamics

1992 ◽  
Vol 69 (18) ◽  
pp. 2678-2681 ◽  
Author(s):  
H. A. Michelsen ◽  
C. T. Rettner ◽  
D. J. Auerbach
Keyword(s):  
Rotational Motion ◽  
Adsorption Desorption

Facilitating role of Pd for hydrogen, oxygen and water adsorption/desorption processes from bulk CeO2 and CeO2/γ-Al2O3

2019 ◽  
Vol 323 ◽  
pp. 141-147 ◽  
Author(s):  
Deniz Kaya ◽  
Dheerendra Singh ◽  
Serkan Kincal ◽  
Deniz Uner
Keyword(s):  
Water Adsorption ◽  
Adsorption Desorption

Carbonised polyaniline and polypyrrole: towards advanced nitrogen-containing carbon materials

2013 ◽  
Vol 67 (8) ◽  
Author(s):  
Gordana Ćirić-Marjanović ◽  
Igor Pašti ◽  
Nemanja Gavrilov ◽  
Aleksandra Janošević ◽  
Slavko Mentus
Keyword(s):  
Electrical Conductivity ◽  
Carbon Materials ◽  
Modern Technology ◽  
Electron Microscopies ◽  
Transmission Electron ◽  
Elemental Analyses ◽  
Adsorption Desorption

AbstractPolyaniline (PANI) and polypyrrole (PPY) undergo carbonisation in an inert/reduction atmosphere and vacuum, yielding different nitrogen-containing carbon materials. This contribution reviews various procedures for the carbonisation of PANI and PPY precursors, and the characteristics of obtained carbonised PANI (C-PANI) and carbonised PPY (C-PPY). Special attention is paid to the role of synthetic procedures in tailoring the formation of C-PANI and C-PPY nanostructures and nanocomposites. The review considers the importance of scanning and transmission electron microscopies, XPS, FTIR, Raman, NMR, and EPR spectroscopies, electrical conductivity and adsorption/desorption measurements, XRD, and elemental analyses in the characterisation of C-PANIs and C-PPYs. The application of C-PANI and C-PPY in various fields of modern technology is also reviewed.

Role of Rotational Motion in the Dissociative Adsorption and Associative Desorption Dynamics ofD2/Cu(111)

1997 ◽  
Vol 78 (2) ◽  
pp. 286-289 ◽  
Author(s):  
Wilson Agerico Diño ◽  
Hideaki Kasai ◽  
Okiji Ayao
Keyword(s):  
Rotational Motion ◽  
Dissociative Adsorption

Role of Electrical Interactions in the Rotational Motion of a Charged Solute Molecule in a Polar Solvent

1998 ◽  
Vol 102 (32) ◽  
pp. 6299-6302 ◽  
Author(s):  
N. V. Brilliantov ◽  
N. G. Vostrikova ◽  
O. P. Revokatov
Keyword(s):  
Rotational Motion ◽  
Polar Solvent ◽  
Solute Molecule

A Mathematical Model Forecasting HF Adsorption onto Cu-Coated Wafers as a Function of the Airborne Concentration and Moisture

2016 ◽  
Vol 255 ◽  
pp. 323-328
Author(s):  
Fernando Herrán ◽  
Hervé Fontaine ◽  
Paola González-Aguirre ◽  
Carlos Beitia ◽  
Jim Ohlsen ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Surface Concentration ◽  
Threshold Concentration ◽  
Sorption Behavior ◽  
Yield Losses ◽  
Airborne Concentration ◽  
Adsorption Desorption

In order to better understand and model the whole sorption behavior of the HF when in contact with a Cu surface inside a FOUP and thus control the related yield losses, Cu-coated wafers have been exposed to varying HF (ppbv) and H2O (% RH) airborne concentrations. These experiments have yielded a HF-Cu sorption empirical-mathematical model that may be used as an industrial tool for queue-time or fluoride surface concentration predictions. Besides, the formation of CuF2 only in case of corrosion is evidenced by the XPS measurements whereas the key role of the H2O is further confirmed by the desorption experiments. The H2O retained by the surface is actually responsible for promoting the HF adsorption/desorption onto/from Cu and enables a HF threshold concentration that separates the two well differenced uptake regimes; adsorption and corrosion.

scholarly journals Pore Characteristics and Hydrothermal Stability of Mesoporous Silica: Role of Oleic Acid

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Junhyun Choi ◽  
Yosep Han ◽  
Soyeon Park ◽  
Jayhyun Park ◽  
Hyunjung Kim
Keyword(s):  
Oleic Acid ◽  
Mesoporous Silica ◽  
Nitrogen Adsorption ◽  
Hydrothermal Stability ◽  
Pore Characteristics ◽  
Silica Surfaces ◽  
Mesopore Structure ◽  
Infrared Spectrometer ◽  
Adsorption Desorption

Silicate mesoporous materials were synthesized with nonionic surfactant and their surfaces were modified by oleic acid adsorption. Infrared spectrometer, nitrogen adsorption-desorption isotherm, scanning electron microscopy, and thermogravimetric analyses were used to investigate the structure of oleic acid modified mesoporous material. The effects of heat treatment at various temperatures on oleic acid modified materials were also studied. Oleic acids on silica surfaces were found to be bonded chemically and/or physically and be capable of enduring up to180°C. The adsorbed oleic acid improved the hydrothermal stability of mesoporous silica and assisted mesopore structure to grow more in hydrothermal treatment process by preventing the approach of water.

scholarly journals Mechanochemical Synthesis and Structure of the Tetrahydrate and Mesoporous Anhydrous Metforminium(2+)-N,N’-1,4-Phenylenedioxalamic Acid Cocrystal Salt: The Role of Hydrogen Bonding and N→π* Charge Assisted Interactions

2020 ◽  
Author(s):  
Sayuri Chong-Canto ◽  
Efrén V. García-Báez ◽  
Francisco J. Martínez-Martínez ◽  
Ángel Ramos-Organillo ◽  
Itzia I. Padilla-Martínez
Keyword(s):  
Hydrogen Bonding ◽  
Mechanochemical Synthesis ◽  
Water Molecules ◽  
X Ray ◽  
X Ray Crystallography ◽  
Adsorption Desorption ◽  
First Time ◽  
Selective Formation ◽  
Crystallization From Solution

A new cocrystal salt of metformin, an antidiabetic drug, and N,N’-(1,4-phenylene)dioxalamic acid, was synthesized by mechanochemical synthesis, purified by crystallization from solution and characterized by single X-ray crystallography. The structure revealed a salt-type cocrystal composed of one dicationic metformin unit, two monoanionic units of the acid and four water molecules namely H2Mf(HpOXA)2∙4H2O. X-ray powder, IR, 13C-CPMAS, thermal and BET adsorption-desorption analyses were performed to elucidate the structure of the molecular and supramolecurar structure of the anhydrous microcrystalline mesoporous solid H2Mf(HpOXA)2. The results suggest that their structures, conformation and hydrogen bonding schemes are very similar between them. To the best of our knowledge, the selective formation of the monoanion HpOXA⁻, as well as its structure in the solid, is herein reported for the first time. Regular O(-)∙∙∙C(), O(-)∙∙∙N+ and bifacial O(-)∙∙∙C()∙∙∙O(-) of n→* charge-assisted interactions are herein described in H2MfA cocrystal salts which could be responsible of the interactions of metformin in biologic systems. The results, support the participation of n→* charge-assisted interactions independently, and not just as a short contact imposed by the geometric constraint due to the hydrogen bonding patterns.

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