Preparation and tribological properties of self‐assembled poly(amide amine)‐Cu nanofilm on silicon

Cui, Baofeng; Zhang, Ling; Zhou, Huidi; Zhang, Junyan; Chen, Jianmin

doi:10.1002/sia.3726

Cited by 9 publications

(3 citation statements)

References 36 publications

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“…While the mechanism of defect formation in mechanically stressed SAMs is of great interest, the question of whether stress induced defects are self-healing or not is of equal importance. Several studies of SAMs under mechanical stress have been carried out using atomic-force microscopy (AFM), nanotribometry, or surface-force investigations that provide detailed structure–activity relations between lubrication properties and macroscopic or microscopic structures. ,− However, these experimental studies only provide limited information on the structural changes during and after release of applied mechanical stress. Molecular-dynamics (MD) simulations of thin molecular films under pressure and/or shear are used to support and interpret these experiments providing additional information about structural changes of SAMs under mechanical stress. − …”

Section: Introductionmentioning

confidence: 99%

Indentation and Self-Healing Mechanisms of a Self-Assembled Monolayer—A Combined Experimental and Modeling Study

Meltzer

Paul²,

Dietrich³

et al. 2014

J. Am. Chem. Soc.

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A combination of in situ vibrational sum-frequency generation (SFG) spectroscopy and molecular-dynamics (MD) simulations has allowed us to study the effects of indentation of self-assembled octadecylphosphonic acid (ODPA) monolayers on α-Al2O3(0001). Stress-induced changes in the vibrational signatures of C-H stretching vibrations in SFG spectra and the results of MD simulations provide clear evidence for an increase in gauche-defect density in the monolayer as a response to indentation. A stress-dependent analysis indicates that the defect density reaches saturation at approximately 155 MPa. After stress is released, the MD simulations show an almost instantaneous healing of pressure-induced defects in good agreement with experimental results. The lateral extent of the contact areas was studied with colocalized SFG spectroscopy and compared to theoretical predictions for pressure gradients from Hertzian contact theory. SFG experiments reveal a gradual increase in gauche-defect density with pressure before saturation close to the contact center. Furthermore, our MD simulations show a spatial anisotropy of pressure-induced effects within ODPA domains: molecules tilted in the direction of the pressure gradient increase in tilt angle while those on the opposite side form gauche-defects.

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Section: Introductionmentioning

confidence: 99%

Indentation and Self-Healing Mechanisms of a Self-Assembled Monolayer—A Combined Experimental and Modeling Study

Meltzer

Paul²,

Dietrich³

et al. 2014

J. Am. Chem. Soc.

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“…N1s spectra of MIL-53(Al)-NH 2 and MIL-53(Al)-2.0G PAMAM are shown in Figure 4 . The observed 399.3 eV peak in raw MIL-53(Al)-NH 2 materials ( Figure 4 A) was attributed to free amine groups [ 34 ]. After grafting with PAMAM dendrimers, two additional peaks at a higher binding energy (400.8 eV) and lower energy (398.6 eV) were observed in MIL-53(Al)-2.0G PAMAM ( Figure 4 B), which could be assigned to amide bond and Schiff base structure [ 35 , 36 ] in PAMAM, respectively.…”

Section: Resultsmentioning

confidence: 99%

Polyamidoamine Dendrimers Functionalized Water-Stable Metal–Organic Frameworks for Sensitive Fluorescent Detection of Heavy Metal Ions in Aqueous Solution

Guo,

Muhammad,

et al. 2023

Polymers

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In this work, polyamidoamine (PAMAM)-functionalized water-stable Al-based metal–organic frameworks (MIL-53(Al)-NH2) were proposed with enhanced fluorescence intensity, and used for the sensitive detection of heavy metal ions in aqueous solution. The size and morphology of MIL-53(Al)-NH2 were effectively optimized by regulating the component of the reaction solvents. PAMAM dendrimers were subsequently grafted onto the surface with glutaraldehyde as a cross-linking agent. It was found that the size and morphology of MIL-53(Al)-NH2 have great influence on their fluorescence properties, and PAMAM grafting could distinctly further improve their fluorescence intensity. With higher fluorescence intensity, the PAMAM-grafted MIL-53(Al)-NH2 showed good linearity (R2 = 0.9925–0.9990) and satisfactory sensitivity (LOD = 1.1–8.6 μmol) in heavy metal ions determination. Fluorescence enhancement and heavy metal ions detection mechanisms were discussed following the experimental results. Furthermore, analogous water-stable Materials of Institute Lavoisier (MIL) metal–organic frameworks such as MIL-53(Fe)-NH2 were also proved to have similar fluorescence enhancement performance after PAMAM modification, which demonstrates the universality of the method and the great application prospects in the design of PAMAM-functionalized high-sensitivity fluorescence sensors.

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“…Usually, hydrophobicity of a surface is directly reflected by its water contact angle (WCA); and surfaces having WCAs below 90° are referred to as hydrophilic surfaces, those with WCAs above 90° are referred to as hydrophobic ones . Previously, we found that the surface roughness and WCA of polyelectrolyte multilayers (PEMs) were increased by introducing Cu nanoparticles . Furthermore, surface‐capped Cu nanoparticles as a lubricating oil additive possessed good anti‐wear and friction‐reduction properties .…”

Section: Introductionmentioning

confidence: 99%

Adhesion and tribological property of Cu nanoparticles‐doped hydrophobic polyelectrolyte multilayers

Yang

Chen

Zhang

et al. 2012

Lubrication Science

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Hydrophobic polyelectrolyte multilayers (PEMs) doped with Cu nanoparticles and modified with fluoroalkylsilane were prepared by a series of reaction cycles, where the polyelectrolyte multilayers were constructed by alternate pipetting of the solutions of poly(diallyldimethylammonium chloride) and poly(sodium 4‐styrene sulfonate) onto a spinning substrate (quartz slide or silicon wafer), and resultant PEMs‐coated substrate was immersed in Cu2+ and NaBH4 solutions to allow nucleation of Cu nanoparticles. The relationship between the water wettability and tribological behavior of the as‐prepared hydrophobic PEMs was studied. Results show that the wettability of the hydrophobic PEMs can be controlled by properly adjusting the reaction cycle. The adhesion and tribological behavior of the Cu nanoparticles‐doped hydrophobic PEMs, excluding the one obtained at 12 reaction cycles, are closely related to their wettability. That is, the PEM film with stronger hydrophobicity has a lower surface energy, showing a lower friction and longer anti‐wear life. Copyright © 2012 John Wiley & Sons, Ltd.

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Preparation and tribological properties of self‐assembled poly(amide amine)‐Cu nanofilm on silicon

Cited by 9 publications

References 36 publications

Indentation and Self-Healing Mechanisms of a Self-Assembled Monolayer—A Combined Experimental and Modeling Study

Indentation and Self-Healing Mechanisms of a Self-Assembled Monolayer—A Combined Experimental and Modeling Study

Polyamidoamine Dendrimers Functionalized Water-Stable Metal–Organic Frameworks for Sensitive Fluorescent Detection of Heavy Metal Ions in Aqueous Solution

Adhesion and tribological property of Cu nanoparticles‐doped hydrophobic polyelectrolyte multilayers

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