Počet záznamů: 1
Mechanical Contact Spectroscopy: Characterizing Nanoscale Adhesive Contacts via Thermal Forces
- 1.
SYSNO ASEP 0508143 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Mechanical Contact Spectroscopy: Characterizing Nanoscale Adhesive Contacts via Thermal Forces Tvůrce(i) Jonáš, Alexandr (UPT-D) RID, SAI, ORCID
Kochanczyk, M.D. (US)
Ramirez, A.D. (US)
Speidel, M. (DE)
Florin, E. L. (DE)Celkový počet autorů 5 Zdroj.dok. Langmuir. - : American Chemical Society - ISSN 0743-7463
Roč. 35, č. 17 (2019), s. 5809-5820Poč.str. 12 s. Forma vydání Tištěná - P Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova model porous-media ; colloid detachment ; surface-roughness Vědní obor RIV BH - Optika, masery a lasery Obor OECD Fluids and plasma physics (including surface physics) Způsob publikování Omezený přístup Institucionální podpora UPT-D - RVO:68081731 UT WOS 000466816900017 EID SCOPUS 85065148201 DOI 10.1021/acs.langmuir.8b04074 Anotace 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. Pracoviště Ústav přístrojové techniky Kontakt Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Rok sběru 2020 Elektronická adresa https://pubs.acs.org/doi/10.1021/acs.langmuir.8b04074
Počet záznamů: 1