Intra- and inter-molecular bonding and structure of inorganic pseudohalides with triatomic groupings

2008 ◽  
pp. 25-55 ◽  
Author(s):  
Z. Iqbal
Keyword(s):  
Molecular Bonding

Fabrication of Nanoscale Hydrophobic Regions on Anodic Alumina for Selective Adhesion of Biologic Molecules

2003 ◽  
Vol 773 ◽  
Author(s):  
Xiefan Lin ◽  
Anthony S. W. Ham ◽  
Natalie A. Villani ◽  
Whye-Kei Lye ◽  
Qiyu Huang ◽  
...  
Keyword(s):  
Anodic Alumina ◽  
Biological Molecules ◽  
Spatial Density ◽  
Length Scale ◽  
Adhesion Sites ◽  
A Cell ◽  
Adhesive Molecules ◽  
Receptor Clusters ◽  
Molecular Bonding ◽  
Fabrication Parameters

AbstractStudies of selective adhesion of biological molecules provide a path for understanding fundamental cellular properties. A useful technique is to use patterned substrates, where the pattern of interest has the same length scale as the molecular bonding sites of a cell, in the tens of nanometer range. We employ electrochemical methods to grow anodic alumina, which has a naturally ordered pore structure (interpore spacing of 40 to 400 nm) controlled by the anodization potential. We have also developed methods to selectively fill the alumina pores with materials with contrasting properties. Gold, for example, is electrochemically plated into the pores, and the excess material is removed by backsputter etching. The result is a patterned surface with closely separated islands of Au, surrounded by hydrophilic alumina. The pore spacing, which is determined by fabrication parameters, is hypothesized to have a direct effect on the spatial density of adhesion sites. By attaching adhesive molecules to the Au islands, we are able to observe and study cell rolling and adhesion phenomena. Through the measurements it is possible to estimate the length scale of receptor clusters on the cell surface. This information is useful in understanding mechanisms of leukocytes adhesion to endothelial cells as well as the effect of adhesion molecules adaptation on transmission of extracellular forces. The method also has applications in tissue engineering, drug and gene delivery, cell signaling and biocompatibility design.

Auger electron angular distributions following excitation or ionization from the Xe 3d and F 1s levels in xenon difluoride

2022 ◽  
Author(s):  
Ruaridh Forbes ◽  
Paul Hockett ◽  
Ivan Powis ◽  
John D. Bozek ◽  
Stephen T. Pratt ◽  
...  
Keyword(s):  
Electron Spectroscopy ◽  
Auger Electron ◽  
Angular Distributions ◽  
Xenon Difluoride ◽  
Core Electrons ◽  
Molecular Bonding

Electron spectroscopy following Xe 3d and F 1s ionization in XeF2 elucidates the influence of core electrons on molecular bonding.

Molecular bonding-based descriptors for surface adsorption and reactivity

2015 ◽  
Vol 324 ◽  
pp. 50-58 ◽  
Author(s):  
Benjamin D. Dunnington ◽  
J.R. Schmidt
Keyword(s):  
Surface Adsorption ◽  
Molecular Bonding

Tip-Induced Control of Charge and Molecular Bonding of Oxygen Atoms on the Rutile TiO2 (110) Surface with Atomic Force Microscopy

ACS Nano ◽  
2019 ◽  
Vol 13 (6) ◽  
pp. 6917-6924 ◽  
Author(s):  
Yuuki Adachi ◽  
Huan Fei Wen ◽  
Quanzhen Zhang ◽  
Masato Miyazaki ◽  
Yasuhiro Sugawara ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Rutile Tio2 ◽  
Force Microscopy ◽  
Atomic Force ◽  
Molecular Bonding ◽  
Oxygen Atoms

scholarly journals Moisture Absorption of Carbon/Epoxy Nanocomposites

2020 ◽  
Vol 4 (1) ◽  
pp. 21 ◽  
Author(s):  
Gorkem E. Guloglu ◽  
M. Cengiz Altan
Keyword(s):  
Carbon Nanomaterials ◽  
Moisture Absorption ◽  
Accurate Determination ◽  
Type Model ◽  
Graphite Nanoplatelets ◽  
Epoxy Nanocomposites ◽  
Thermal Environments ◽  
Thermogravimetric Data ◽  
Hindered Diffusion ◽  
Molecular Bonding

Moisture absorption of composites with nanoscale carbon additives such as carbon nanotubes, carbon nanofibers, graphite nanoplatelets, and carbon black is investigated using thermogravimetric data and a non-Fickian hindered diffusion (Langmuir-type) model. The moisture absorption parameters are determined using this model for six different types of carbon/epoxy nanocomposites. The absorption behaviors obtained at different humidity levels and thermal environments are recovered by minimizing the error between the experimental data and model predictions, thus enabling the accurate determination of the moisture equilibrium level. The absorption behavior and the weight gain of all nanocomposites are shown to be accurately represented by this model over the entire absorption period. The presence of carbon nanomaterials is found to induce varying levels of non-Fickian behavior, governed by the nondimensional hindrance coefficient. This behavior is enhanced with the nanomaterial content and separate from the slight non-Fickian behavior of all neat epoxy samples. The molecular bonding during diffusion, as well as the interfacial moisture storage, could be among the reasons for non-Fickian behavior and should be included in the absorption models for accurate characterization of carbon/epoxy nanocomposites.

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