The Surface Chemistry of Amorphous Synthetic Silica—Interaction with Organic Molecules in an Aqueous Medium

2009 ◽  
pp. 3-3-27 ◽  
Author(s):  
RK Iler
Keyword(s):  
Surface Chemistry ◽  
Aqueous Medium ◽  
Organic Molecules

Can an ammonium-based room temperature ionic liquid counteract the urea-induced denaturation of a small peptide?

2017 ◽  
Vol 19 (11) ◽  
pp. 7772-7787 ◽  
Author(s):  
Soumadwip Ghosh ◽  
Souvik Dey ◽  
Mahendra Patel ◽  
Rajarshi Chakrabarti
Keyword(s):  
Ionic Liquid ◽  
Aqueous Medium ◽  
Room Temperature ◽  
Organic Molecules ◽  
Room Temperature Ionic Liquid ◽  
Small Peptide ◽  
Small Organic Molecules

The folding/unfolding equilibrium of proteins in aqueous medium can be altered by adding small organic molecules generally termed as co-solvents.

Electrosynthesis in aqueous medium: a kinetic study of the electrocatalytic oxidation of oxygenated organic molecules

1991 ◽  
Vol 36 (7) ◽  
pp. 1157-1164 ◽  
Author(s):  
E.M. Belgsir ◽  
E. Bouhier ◽  
H. Essis Yei ◽  
K.B. Kokoh ◽  
B. Beden ◽  
...  
Keyword(s):  
Kinetic Study ◽  
Aqueous Medium ◽  
Electrocatalytic Oxidation ◽  
Organic Molecules

Microstructure and permittivity of sintered BaTiO3: influence of particle surface chemistry in an aqueous medium

2004 ◽  
Vol 39 (1) ◽  
pp. 93-102 ◽  
Author(s):  
Sangkyu Lee ◽  
Ungyu Paik ◽  
Vincent A. Hackley ◽  
Yeon-Gil Jung ◽  
Kyung-Jin Yoon
Keyword(s):  
Surface Chemistry ◽  
Aqueous Medium ◽  
Particle Surface

scholarly journals A new multi-beam apparatus for the study of surface chemistry routes to formation of complex organic molecules in space

2020 ◽  
Vol 91 (12) ◽  
pp. 124504
Author(s):  
E. Congiu ◽  
A. Sow ◽  
T. Nguyen ◽  
S. Baouche ◽  
F. Dulieu
Keyword(s):  
Surface Chemistry ◽  
Organic Molecules ◽  
Complex Organic

Coating of Silicon Nitride with Sintering Aid

1991 ◽  
Vol 249 ◽  
Author(s):  
P. N. Joshi ◽  
R. A. Mccauley
Keyword(s):  
Silicon Nitride ◽  
Surface Chemistry ◽  
Metal Oxides ◽  
Aqueous Medium ◽  
Sintered Material ◽  
Sintering Behavior ◽  
Nitride Powder ◽  
Sintering Aid ◽  
Precise Control ◽  
Metal Organic

ABSTRACTCommercially available silicon nitride powders were coated with various metal oxides with the help of metal-organic surfactants in an aqueous medium. A surfactants could also act as a dispersant. The coatings were studied by XPS, TEM and accoustophoresis and the mechanism for formation of these coatings is proposed. The amount of sintering aid incorporated was determined by the surface area and surface chemistry of the nitride powder, the pH of the solution, the structure of the surfactant and the surface charge behavior of the powder and the coating. Multicomponent coatings were also possible by precise control of these parameters. The sintering behavior of the coated powders and the properties of the sintered material were promising.

scholarly journals Complex organic molecules along the accretion flow in isolated and externally irradiated protoplanetary disks

2014 ◽  
Vol 168 ◽  
pp. 389-421 ◽  
Author(s):  
Catherine Walsh ◽  
Eric Herbst ◽  
Hideko Nomura ◽  
T. J. Millar ◽  
Susanna Widicus Weaver
Keyword(s):  
Surface Chemistry ◽  
Gas Phase ◽  
Organic Molecules ◽  
Molecular Layer ◽  
Accretion Flow ◽  
Chemical Complexity ◽  
Outer Disk ◽  
Molecular Abundances ◽  
Grain Surface ◽  
Complex Organic

The birth environment of the Sun will have influenced the physical and chemical structure of the pre-solar nebula, including the attainable chemical complexity reached in the disk, important for prebiotic chemistry. The formation and distribution of complex organic molecules (COMs) in a disk around a T Tauri star is investigated for two scenarios: (i) an isolated disk, and (ii) a disk irradiated externally by a nearby massive star. The chemistry is calculated along the accretion flow from the outer disk inwards using a comprehensive network which includes gas-phase reactions, gas-grain interactions, and thermal grain-surface chemistry. Two simulations are performed, one beginning with complex ices and one with simple ices only. For the isolated disk, COMs are transported without major chemical alteration into the inner disk where they thermally desorb into the gas reaching an abundance representative of the initial assumed ice abundance. For simple ices, COMs can efficiently form on grain surfaces under the conditions in the outer disk. Gas-phase COMs are released into the molecular layer via photodesorption. For the irradiated disk, complex ices are also transported inwards; however, they undergo thermal processing caused by the warmer conditions in the irradiated disk which tends to reduce their abundance along the accretion flow. For simple ices, grain-surface chemistry cannot efficiently synthesise COMs in the outer disk because the necessary grain-surface radicals, which tend to be particularly volatile, are not sufficiently abundant on the grain surfaces. Gas-phase COMs are formed in the inner region of the irradiated disk via gas-phase chemistry induced by the desorption of strongly bound molecules such as methanol; hence, the abundances are not representative of the initial molecular abundances injected into the outer disk. These results suggest that the composition of comets formed in isolated disks may differ from those formed in externally irradiated disks with the latter composed of more simple ices.

Modeling the surface chemistry of biomass model compounds on oxygen-covered Rh(100)

2016 ◽  
Vol 18 (34) ◽  
pp. 23888-23903 ◽  
Author(s):  
B. Caglar ◽  
J. W. (Hans) Niemantsverdriet ◽  
C. J. (Kees-Jan) Weststrate
Keyword(s):  
Surface Chemistry ◽  
Aqueous Medium ◽  
Metal Surfaces ◽  
Model Compounds ◽  
Fundamental Insight ◽  
Related Compounds

This study provides a fundamental insight about how biomass-related compounds interact with metal surfaces in aqueous medium.

Chemical modelling of N-bearing COMs in star-forming regions

2017 ◽  
Vol 13 (S332) ◽  
pp. 415-417
Author(s):  
David Quénard ◽  
Izaskun Jiménez-Serra ◽  
Serena Viti ◽  
Jonathan Holdship
Keyword(s):  
Surface Chemistry ◽  
Gas Phase ◽  
Organic Molecules ◽  
Methyl Isocyanate ◽  
Star Forming ◽  
Star Forming Regions ◽  
Chemical Modelling ◽  
Grain Surface ◽  
Complex Organic

AbstractThe study of complex organic molecules, and more specifically those of prebiotic interest, is important to understand the chemical richness of star-forming regions. The chemistry of nitrogen bearing molecules such as formamide or methyl isocyanate is poorly constrained. We study different chemical pathways to form and destroy these molecules from both the gas phase and grain surface chemistry. From comparison with observations of four different relevant astrophysical regions, we show that both the gas phase and grain surface chemistry are required to explain the observed abundances of these species.

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