The role of surface defects in large organic molecule adsorption: substrate configuration effects

2012 ◽  
Vol 14 (30) ◽  
pp. 10726 ◽  
Author(s):  
Thomas Waldmann ◽  
Christina Nenon ◽  
Katrin Tonigold ◽  
Harry E. Hoster ◽  
Axel Groß ◽  
...  
Keyword(s):  
Organic Molecule ◽  
Surface Defects ◽  
Molecule Adsorption ◽  
Large Organic Molecule

Organic Molecule Adsorption on Stepped Si–Au Surfaces: Role of Functional Group on Geometry and Electronic Structure

2019 ◽  
Vol 256 (7) ◽  
pp. 1800653
Author(s):  
Conor Hogan ◽  
Svetlana Suchkova ◽  
Friedhelm Bechstedt ◽  
Eugen Speiser ◽  
Sandhya Chandola ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Organic Molecule ◽  
Functional Group ◽  
Molecule Adsorption

Ab initiostudy of electron affinity variation induced by organic molecule adsorption on the silicon (001) surface

2007 ◽  
Vol 76 (3) ◽  
Author(s):  
Ivo Borriello ◽  
Giovanni Cantele ◽  
Domenico Ninno ◽  
Giuseppe Iadonisi ◽  
Maurizio Cossi ◽  
...  
Keyword(s):  
Electron Affinity ◽  
Organic Molecule ◽  
Molecule Adsorption

Surface Defects in Drawn Aluminum Magnet Wire

1975 ◽  
Vol 97 (1) ◽  
pp. 134-141 ◽  
Author(s):  
R. N. Wright ◽  
A. T. Male
Keyword(s):  
Defect Structure ◽  
Surface Characterization ◽  
Surface Defect ◽  
Potential Role ◽  
Surface Defects ◽  
Repair Process ◽  
Fine Surface ◽  
Magnet Wire ◽  
Characterization Studies

The fine surface defect structure of commercial EC grade aluminum magnet wire has been characterized and four basic component types have been identified. A grading system has been established for each of the component defects. Intermediate process surface characterization studies and laboratory drawing experiments have been performed to clarify the origin of the defects. The potential role of drawing lubrication in repairing or compounding the defect structure has been demonstrated and the mechanics of a drawing related repair process have been clarified through study of the effects of rod drawing on hardness indentations.

Death at Number

2013 ◽  
Author(s):  
Lars Öhrström
Keyword(s):  
Natural Resources ◽  
Organic Molecule ◽  
Copper Production ◽  
Direct Link ◽  
North West ◽  
Good Story ◽  
The World ◽  
Large Organic Molecule ◽  
Male Activity ◽  
The Military

The five others went first, one by one, and contemporary sources noted how humane the spectacle was, as the participants did not need to see each other. Thousands of Stockholmers had turned out to watch, on this cold day of 30 January 1744, as the last of the six, Gustaf Schedin, accountant at the Insjö copper works, mounted the scaffold. As the culmination of the show, he would be both beheaded and then cut to pieces. The summer before, Schedin had led the fourth Dalecarlian Rebellion: the last march of the free miners and farmers of Dalarna— the mine-rich county 100 miles north-west of Stockholm—to the Swedish capital, in a movement expressing raging discontent with the king, Fredrik I, and his disastrous war with Russia. This sort of thing had been successful before: the fiercely independent-minded people of Dalarna traditionally wielded a certain power, rich as they were in natural resources—the jewel in the crown being the famous Great Copper Mountain mine in Falun. Once it was the largest of its kind in the world, and yielded something like 70 per cent of the world’s copper production. The Falun mine, like many others, was once managed as a cooperative operation, and worked by free miners called mountain-men (bergsmän) with special privileges and laws of their own. But their time was at an end. In 1743 the uprising ended in a bloodbath in Stockholm, and now the six leaders were to be executed. The copper mine was also losing its privileged position. It had given the Swedish kings and queens economic strength for numerous more-or-less successful military adventures down in continental Europe, but was now in decline, and so was the military power of Sweden. This traditionally male activity—becoming angry and getting the lads together to sort things and people out—is chemically related to high levels of the large organic molecule testosterone. For a inorganic chemist inclined to find a good story, it would have been great to now present a direct link between copper and the way we make this molecule in our bodies, starting from cholesterol, claiming that this made the men from Dalarna more inclined to hasty revolutionary actions.

Characterization of Surface Defects Associated with Flash Butt-Welded Pearlitic Rails and their Contribution to Overload and Fatigue Failures

2009 ◽  
Vol 83-86 ◽  
pp. 1262-1269 ◽  
Author(s):  
Mostafa Mousavizade ◽  
Hassan Farhangi
Keyword(s):  
Surface Defects ◽  
Weld Zone ◽  
Welding Process ◽  
Electrical Heating ◽  
Main Concern ◽  
Zone Formation ◽  
Butt Welding ◽  
Fatigue Failures

Generally about 80 percent of railway tracks are welded by flash-butt welding that consists of electrical heating and hydraulic forging. Fracture of rails specially weld zone fractures are of main concern because of potential risk of a catastrophic derailment. In this paper, surface defects associated with flash butt welding process are examined. Metallographic and fractographic studies show various defects can be formed at the surface of weld zone. Formation mechanism of these defects and their contribution to the observed fatigue and overload weld failures are discussed. Fracture mechanics is also utilized to clarify the role of these defects in fatigue and overload failures.

An Atomistic Simulation Study of the Role of Asperities and Indentations on Heterogeneous Bubble Nucleation

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
Brian R. Novak ◽  
Edward J. Maginn ◽  
Mark J. McCready
Keyword(s):  
Heat Flux ◽  
Atomistic Simulation ◽  
Surface Defects ◽  
Constant Heat Flux ◽  
Bubble Nucleation ◽  
Nonequilibrium Molecular Dynamics ◽  
Lennard Jones ◽  
Dynamics Simulations ◽  
Fluid Interaction

Heterogeneous bubble nucleation was studied on surfaces having nanometer scale asperities and indentations as well as different surface-fluid interaction energies. Nonequilibrium molecular dynamics simulations at constant normal stress and either temperature or heat flux were carried out for the Lennard–Jones fluid in contact with a Lennard–Jones solid. When surface defects were of the same size or smaller than the estimated critical nucleus (the smallest nucleus whose growth is energetically favored) size of 1000–2000Å3, there was no difference between the defected surfaces and atomically smooth surfaces. On the other hand, surfaces with significantly larger indentations had nucleation rates that were about two orders of magnitude higher than the systems with small defects. Moreover, nucleation was localized in the large indentations. This localization was greatest under constant heat flux conditions and when the solid-fluid interactions were weak. The results suggest strategies for enhancing heterogeneous bubble nucleation rates as well as for controlling the location of nucleation events.

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