Mechanical Contact Spectroscopy: Characterizing Nanoscale Adhesive Contacts via Thermal Forces
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F19%3A00508143" target="_blank" >RIV/68081731:_____/19:00508143 - isvavai.cz</a>
Result on the web
<a href="https://pubs.acs.org/doi/10.1021/acs.langmuir.8b04074" target="_blank" >https://pubs.acs.org/doi/10.1021/acs.langmuir.8b04074</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/acs.langmuir.8b04074" target="_blank" >10.1021/acs.langmuir.8b04074</a>
Alternative languages
Result language
angličtina
Original language name
Mechanical Contact Spectroscopy: Characterizing Nanoscale Adhesive Contacts via Thermal Forces
Original language description
The adhesion of micro- and nanoparticles to solid substrates immersed in liquids is a problem of great scientific and technological importance. However, the quantitative characterization of such nanoscale adhesive contacts without rupturing them still presents a major experimental challenge. In this article, we introduce mechanical contact spectroscopy (MCS), an experimental technique for the nondestructive probing of particle adhesion in liquid environments. With MCS, the strength of adhesive contacts is inferred from residual position fluctuations of adherent particles excited by thermal forces. In particular, the strength of adhesion is correlated with the standard deviation of the particle lateral position x, with smaller position standard deviations xi = root <Delta x(2)> indicating higher adhesive strength. For a given combination of particles, substrate, and immersion medium, the adhesion is characterized by the mechanical contact spectrum, which is a histogram of xi values obtained from tracking an ensemble of adherent particles. Because the energy of thermal excitation at room temperature is very small in comparison to the typical total energy of adhesive contacts, the studied contacts remain in equilibrium during the measurement. Using MCS, we study the adhesion of micrometer-sized particles to planar solid substrates under a wide range of environmental conditions, including liquid immersion media of varying ionic strength and adhesion substrates with different chemical functionality of their surfaces. These experiments provide evidence that MCS is capable of reproducibly detecting minute changes in the particle-substrate work of adhesion while at the same time covering the range of adhesive contact strength relevant in the context of surface chemistry, biology, and microfabrication.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Langmuir
ISSN
0743-7463
e-ISSN
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Volume of the periodical
35
Issue of the periodical within the volume
17
Country of publishing house
US - UNITED STATES
Number of pages
12
Pages from-to
5809-5820
UT code for WoS article
000466816900017
EID of the result in the Scopus database
2-s2.0-85065148201