A high resolution probe for scanning electrostatic potential profiles across surfaces

Scruton, B; Blott, B H

doi:10.1088/0022-3735/6/5/019

Cited by 25 publications

(8 citation statements)

References 6 publications

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“…It is well known in the vapour-deposition of metals that nucleation is inhibited by fingerprint contamination. The print also produces striking changes in the surface potential (Scruton and Blott 1973) and affects the nucleation of salts from solution (Robins et a1 in preparation). Nevertheless the quantity of material involved in a fingerprint deposit is small; usually it weighs no more than 10 pg, ie its mean thickness is of the order of 0.1 pm.…”

Section: Introductionmentioning

confidence: 99%

The deposition of fingerprint films

Scruton

Robins

Blott

1975

J. Phys. D: Appl. Phys.

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The contact of human fingers with solid surfaces and their subsequent separation have been studied microscopically. Scanning electron microscopy and contact angle measurements have been applied to examine the deposit film. When a finger touches a surface, a film of liquid present on the finger spreads to produce apparent contact over much of the fingerprint ridge area. Lifting of the finger causes the film to recede and leave a deposit which may be either a distribution of droplets on a thin contaminating layer of adsorbed molecules, or a continuous film: which type is dependent on both the composition of the fingerprint and the nature of the substrate.

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Section: Introductionmentioning

confidence: 99%

The deposition of fingerprint films

Scruton

Robins

Blott

1975

J. Phys. D: Appl. Phys.

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“…f 0 5 360 mV. The commonly encountered surface potentials of clay minerals in engineering applications may be <360 mV (van Olphen, 1977), but in many science disciplines the surface potentials of charged metal surfaces can be as high as 400 mV (Scruton and Blott, 1973). A wide range of electrolyte concentrations was, therefore, selected in the present study in order to analyze the conditions under which the characteristic length, 1/k, becomes equal to the equivalent DDL thickness, d c .…”

Section: Resultsmentioning

confidence: 99%

“…Plastic clays are of interest as buffer and backfill materials in toxic-waste and high-level nuclear-waste disposal facilities all over the world (JNCDI, 1999;Zheng et al, 2011;Sellin and Leupin, 2014). Several natural and commercially available plastic clays (e.g.…”

Section: Introductionmentioning

confidence: 99%

A Critical Appraisal of Debye Length in Clay-Electrolyte Systems

Bharat

Sridharan

2015

Clays and clay miner.

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The equivalent diffuse double layer (DDL) thickness in clay-electrolyte systems is a very useful parameter for analyzing the engineering behavior of clays under different environmental conditions. The equivalent DDL thickness is generally assumed to be equal to the characteristic (Debye) length. The present work examined critically the applicability of characteristic length to define equivalent DDL thickness under various clay-surface and pore-fluid conditions. A critical analysis is presented of the changes in the equivalent DDL thickness and characteristic length under the influence of different clay-surface and electrolyte properties. The equivalent DDL thickness was found to be smaller than the characteristic length for a wide range of surface and pore-fluid parameters normally encountered in engineering practice. An accurate and simple power relationship was developed to predict the equivalent DDL thickness from the characteristic length, which is applicable to a wide range of clay-electrolyte systems.

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“…A high resolution electrostatic probe has been designed to measure this difference (7). Essentially the probe consists of a thin wire (50 [lm to 100 flm in diameter) connected to a high input impedance amplifier.…”

Section: Electrical Propertiesmentioning

confidence: 99%

Physical Methods of Fingerprint Development

Thomas

1975

Canadian Society of Forensic Science Journal

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A brief review is given of recent research in the United Kingdom in the field of physical methods applied to fingerprint problems. Some work on the mechanics of powder adhesion to fingerprints is reported along with new results on the physical properties of fingerprints. The development of fingerprints by the use of metal vapour under vacuum is discussed. This method has been used for the successful devetopment of scene of crime fingerprints on polythene. RESUME l'auteur passe brievement en revue les recherches recentes faites au Royaume-Uni dans le domaine des methodes physiques appliquees aux problemes dactyloscopiques. 11 y etudie les travaux sur le mecanisme de I'adherence des poudres Cl I'empreinte digitale, ains; que les dernieres decouvertes sur les proprietes physiques des empreintes. l'auteur aborde egalement le developpe. ment des traces digitales par la methode des vapeurs metalliques sous vide, methode utilisee avec succes pour le developpement des traces de doigts sur le polythene.

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A high resolution probe for scanning electrostatic potential profiles across surfaces

Cited by 25 publications

References 6 publications

The deposition of fingerprint films

The deposition of fingerprint films

A Critical Appraisal of Debye Length in Clay-Electrolyte Systems

Physical Methods of Fingerprint Development

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