Adv Eng Mater
 2010
DOI: 10.1002/adem.201000090
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Adhesion Characteristics of PDMS Surfaces During Repeated Pull‐Off Force Measurements

Elmar Kroner
1
,
Roya Maboudian
2
,
Eduard Arzt
3

Abstract: To mimic the adhesive effects of gecko toes, artificial surfaces have been manufactured recently using polydimethylsiloxanes (PDMS). However, the effects of repeated contacts on the adhesive properties remain largely unexplored. In this paper we report on the effect of repeated pull‐off force measurements on the adhesion behavior of PDMS (polymer kit Sylgard 184, Dow Corning) tested with a borosilicate glass probe. A decrease in pull‐off force with increase in number of test cycles is found until a plateau is … Show more

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Cited by 117 publications

(94 citation statements)
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“…First, under 0% RH the adhesion force increases as the preload increases from 2 to 32 mN. This trend is consistent with other investigations of flat PDMS with spherical glass probes . A preload dependent adhesion force is not anticipated for the elastic contact of spherical unpatterned/smooth bodies .…”
Section: Resultssupporting
confidence: 90%
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
“…First, under 0% RH the adhesion force increases as the preload increases from 2 to 32 mN. This trend is consistent with other investigations of flat PDMS with spherical glass probes . A preload dependent adhesion force is not anticipated for the elastic contact of spherical unpatterned/smooth bodies .…”
Section: Resultssupporting
confidence: 90%
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
“…The adhesion force does not change as significantly compared to the friction force over the eight cycles. The decrease and adhesion and friction forces are consistent with Kroner's study, 22 where this phenomenon was also attributed to material transfer from the sample to the probe.…”
Section: ■ Results and Discussionsupporting
confidence: 89%
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
“…Force-distance curves show strong adhesion forces ( from 27 to 56nN), especially in the unloading part (pulloff force), that appear to be influenced by the probe state. We have observed the same experimental evidence made by E. Kroner et al [59], where during the first contact the adhesion force is lower than the second contact maybe because some free oligomers are pulled out from the sample and transferred on the tip [59].…”
Section: Young's Modulus Evaluationsupporting
confidence: 88%
Exaggerated anticipatory anxiety is common in social anxiety disorder (SAD). Neuroimaging studies have revealed altered neural activity in response to social stimuli in SAD, but fewer studies have examined neural activity during anticipation of feared social stimuli in SAD. The current study examined the time course and magnitude of activity in threat processing brain regions during speech anticipation in socially anxious individuals and healthy controls (HC). Method Participants (SAD n = 58; HC n = 16) underwent functional magnetic resonance imaging (fMRI) during which they completed a 90s control anticipation task and 90s speech anticipation task.
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