Direct Force Measurements at the Smooth Gold/Mica Interface

and, Randolph F. Knarr; Quon, R.; Vanderlick, T. Kyle

doi:10.1021/la980133m

Cited by 34 publications

(45 citation statements)

References 44 publications

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“…In this communication we report on a facile route to SAM‐protected ultrasmooth gold surfaces that does not involve harsh mechanical shear on the lower gold/mica interface. Knarr et al measured the adhesion of this smooth gold/mica interface by direct force measurement and their value ( F p / R =1800 mN m −1 )9a proves that high forces are indeed necessary to separate the gold from the mica.…”

Section: Contact Angles and Thicknesses For Sams Produced By Thiol Spmentioning

confidence: 94%

Triphenylphosphane‐Functionalised Amphiphilic Copolymers: Tailor‐Made Support Materials for the Efficient and Selective Aqueous Two‐Phase Hydroformylation of 1‐Octene

Bortenschlager

Schöllhorn

Wittmann

et al. 2006

Chemistry A European J

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Amphiphilic copolymers (random P1 and block P2) based on 2-oxazolines were synthesised with triphenylphosphane ligands covalently linked to the polymers by means of a metal-free synthesis route. The resulting macroligands were used in the aqueous two-phase hydroformylation of 1-octene. The influence of the polymer architecture (random and block copolymers) on activity and selectivity of the hydroformylation reaction was investigated and compared with that of nonfunctionalised copolymers (random P3 and block P4) and Rh(I)/triphenylphosphane trisulfonate as a water-soluble catalyst. The highest activities were observed for the random copolymer P1 (p=50 bar, T=100 degrees C, c=8 x 10(-4) mol L(-1)) with a turnover frequency (TOF) of 3700 h(-1), whereas the corresponding block copolymer P2 reached TOF numbers of 1630 h(-1). Additionally, both macroligands indicated efficient suppression of isomerisation and led to almost constant n/iso selectivities of about 3 after complete substrate conversion. Copolymers P3 and P4 showed, under identical reaction conditions, strong isomerisation after 40-60 % conversion (n/iso approximately 0.7) and maximum activities of 1560 h(-1) (P3) and 1330 h(-1) (P4) at a concentration of 5 x 10(-3) mol L(-1).

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Section: Contact Angles and Thicknesses For Sams Produced By Thiol Spmentioning

confidence: 94%

Triphenylphosphane‐Functionalised Amphiphilic Copolymers: Tailor‐Made Support Materials for the Efficient and Selective Aqueous Two‐Phase Hydroformylation of 1‐Octene

Bortenschlager

Schöllhorn

Wittmann

et al. 2006

Chemistry A European J

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“…[1][2][3] Similarly, the measurement of surface forces is extremely sensitive to substrate inhomogeneities. 4,23 Nicolas Vogel Nicolas Vogel studied chemistry at the University of Mainz, Germany and at Seoul National University, South Korea and conducted research for his diploma thesis in the group of Wolfgang Knoll at the Max Planck Institute for Polymer Research in Mainz, Germany. For his PhD, he joined Katharina Landfester's group at the Max Planck Institute to work on two dimensional colloidal crystallization and colloidal lithography.…”

Section: Introductionmentioning

confidence: 99%

As flat as it gets: ultrasmooth surfaces from template-stripping procedures

2012

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In an experimentally simple replica process, the natural flatness of mica or polished silicon wafers can be transferred to metal films, resulting in metal surfaces with topographic features in Angstrom dimensions over large areas. Two decades after its invention, the template-stripping process continues to appeal to scientists from diverse research backgrounds primarily due to its simplicity, cost-effectiveness and ability to yield high quality substrates and structures. This article introduces the basic construction process for template-stripped substrates, and reports on a variety of extensions of the process, including the generation of materials contrasts and the design of tailored topographies. It also highlights the use of such substrates in a variety of research fields in nanoscience and technology ranging from surface force measurement and high definition imaging to the self-assembly of model membranes and plasmonics.

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“…9 is developed. The direct metal-metal contacts can occur during the unloading process, causing cold-welding (re-bonding) at the contact surfaces [15][16][17]. During the process, microstructure refinement can also occur near the crack surfaces.…”

Section: Discussionmentioning

confidence: 99%

Fatigue crack propagation properties of Ti–6Al–4V in vacuum environments

Oguma

Nakamura

2013

International Journal of Fatigue

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Abstract:To determine the effects of vacuum environment on fatigue crack propagations in a Ti-6Al-4V alloy, K-decreasing tests were conducted in air and vacuum. The fatigue crack propagation rate became slower and threshold stress intensity factor range became larger with decreasing vacuum pressure.The tendency cannot be fully explained by the crack closure. Based on fracture surface observations, granular region of a few micrometer size asperities was observed on the fracture surface only in high vacuum and ultra high vacuum. The high vacuum environment is one of the necessary conditions for the formation of the granular region, and the fraction of surface coverage of adsorbed gas on fracture surfaces relates to the phenomenon. The formation of the granular region represents the difference of the crack propagation mechanism between vacuum and air environments. A new mechanism for the formation of the granular region was proposed, and that is one of the phenomena which can explain the reduction of crack propagation rate in vacuum.

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Direct Force Measurements at the Smooth Gold/Mica Interface

Cited by 34 publications

References 44 publications

Triphenylphosphane‐Functionalised Amphiphilic Copolymers: Tailor‐Made Support Materials for the Efficient and Selective Aqueous Two‐Phase Hydroformylation of 1‐Octene

Triphenylphosphane‐Functionalised Amphiphilic Copolymers: Tailor‐Made Support Materials for the Efficient and Selective Aqueous Two‐Phase Hydroformylation of 1‐Octene

As flat as it gets: ultrasmooth surfaces from template-stripping procedures

Fatigue crack propagation properties of Ti–6Al–4V in vacuum environments

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