Identifying and characterising the different structural length scales in liquids and glasses: an experimental approach

ABSTRACTDuring processes of mechanical alloying the characteristic structural length scales of an alloy, including the phase domain size and the crystallite grain size, decrease gradually to a nanocrystalline or even amorphous final state. This method therefore allows a unique avenue to explore the structure-property relationship over several orders of magnitude in length scale. In this work we have considered an ideal equiatomic Ti-Zr system deformed through multiple cold-rolling passes to refine the structural length scales into the nanometer range. The variation of the hardness of the system with decreasing length scale is discussed in terms of traditional Hall-Petch scaling, chemical mixing and the phase evolution of the system, as well as other possible contributions to the hardness variations during processing.

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Sensitivity of structural models of composite material to structural length scales

International Applied Mechanics ◽

10.1007/s10778-006-0206-9 ◽

2006 ◽

Vol 42 (12) ◽

pp. 1364-1370 ◽

Cited By ~ 9

Author(s):

J. J. Rushchitsky

Keyword(s):

Composite Material ◽

Structural Models ◽

Length Scales ◽

Structural Length

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Rescaling of structural length scales for “soft effective segment” representations of polymers in good solvent

Soft Matter ◽

10.1039/c1sm05335c ◽

2011 ◽

Vol 7 (11) ◽

pp. 5255 ◽

Cited By ~ 12

Author(s):

Ivan Coluzza ◽

Barbara Capone ◽

Jean-Pierre Hansen

Keyword(s):

Length Scales ◽

Structural Length

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Advances in our understanding of the structure and functionality of edible fats and fat mimetics

Soft Matter ◽

10.1039/c9sm01704f ◽

2020 ◽

Vol 16 (2) ◽

pp. 289-306 ◽

Cited By ~ 10

Author(s):

Alejandro G. Marangoni ◽

John P. M. van Duynhoven ◽

Nuria C. Acevedo ◽

Reed A. Nicholson ◽

Ashok R. Patel

Keyword(s):

Fractal Aggregates ◽

Length Scales ◽

Edible Fats ◽

Fat Crystal Network ◽

Crystal Network ◽

Structural Length

Structural length scales within a fat crystal network, from TAG molecules packing into lamellae, crystalline nanoplatelets and fractal aggregates of nanoplatelets.

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Mesoscopic Structural Length Scales in P3HT/PCBM Mixtures Remain Invariant for Various Processing Conditions

Chemistry of Materials ◽

10.1021/cm4011426 ◽

2013 ◽

Vol 25 (14) ◽

pp. 2812-2818 ◽

Cited By ~ 18

Author(s):

Sameer Vajjala Kesava ◽

Rijul Dhanker ◽

Derek R. Kozub ◽

Kiarash Vakhshouri ◽

U Hyeok Choi ◽

...

Keyword(s):

Processing Conditions ◽

Length Scales ◽

Structural Length

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Experimental Determination of the Effective Resolution Limit in Thick Specimens at High Voltages

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100116942 ◽

1975 ◽

Vol 33 ◽

pp. 664-665

Author(s):

Mircea Fotino

Keyword(s):

Experimental Approach ◽

Chromatic Aberration ◽

Resolving Power ◽

Biological Research ◽

Specimen Thickness ◽

Resolution Limit ◽

High Voltage Electron Microscopy ◽

Voltage Electron ◽

Resolution Level

The use of thick specimens (0.5 μm to 5.0 μm or more) is one of the most resourceful applications of high-voltage electron microscopy in biological research. However, the energy loss experienced by the electron beam in the specimen results in chromatic aberration and thus in a deterioration of the effective resolving power. This sets a limit to the maximum usable specimen thickness when investigating structures requiring a certain resolution level.An experimental approach is here described in which the deterioration of the resolving power as a function of specimen thickness is determined. In a manner similar to the Rayleigh criterion in which two image points are considered resolved at the resolution limit when their profiles overlap such that the minimum of one coincides with the maximum of the other, the resolution attainable in thick sections can be measured by the distance from minimum to maximum (or, equivalently, from 10% to 90% maximum) of the broadened profile of a well-defined step-like object placed on the specimen.

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Malfunctional Reorganization in the Developing Limbo-Prefrontal System in Animals: Implications for Human Psychoses?

Zeitschrift für Neuropsychologie ◽

10.1024//1016-264x.12.1.8 ◽

2001 ◽

Vol 12 (1) ◽

pp. 8-14

Author(s):

Gertraud Teuchert-Noodt ◽

Ralf R. Dawirs

Keyword(s):

Prefrontal Cortex ◽

Mental Disorders ◽

Dentate Gyrus ◽

Cognitive Functions ◽

Experimental Approach ◽

Regulatory Mechanisms ◽

Hippocampal Dentate Gyrus ◽

Non Invasive ◽

Invasive Method ◽

Activity Dependent

Abstract: Neuroplasticity research in connection with mental disorders has recently bridged the gap between basic neurobiology and applied neuropsychology. A non-invasive method in the gerbil (Meriones unguiculus) - the restricted versus enriched breading and the systemically applied single methamphetamine dose - offers an experimental approach to investigate psychoses. Acts of intervening affirm an activity dependent malfunctional reorganization in the prefrontal cortex and in the hippocampal dentate gyrus and reveal the dopamine position as being critical for the disruption of interactions between the areas concerned. From the extent of plasticity effects the probability and risk of psycho-cognitive development may be derived. Advance may be expected from insights into regulatory mechanisms of neurogenesis in the hippocampal dentate gyrus which is obviously to meet the necessary requirements to promote psycho-cognitive functions/malfunctions via the limbo-prefrontal circuit.

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