Frictional Properties of Molybdenum-Based Lubricating Oil Additives Using Green Chemistry

Bhalla, Gaurav; Tsang, Man Hon; Gao, David; Chen, Qunlai; Ruhe, William; Ushioda, Nobuo

doi:10.4271/2011-01-2131

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…Thin fi lms composed of organic molecules are of wide interest in surface science, catalysis, [ 1 ] lubrication, [ 2,3 ] and molecular electronics. [4][5][6] Controlling the structure and properties of these fi lms at molecular scale is of critical importance for designing novel functionalities of the overall material, which are Achieving control over formation of molecular fi lms on insulating substrates is important for designing novel 2D functional materials and devices.…”

Section: Introductionmentioning

confidence: 99%

Molecular Design and Control Over the Morphology of Self‐Assembled Films on Ionic Substrates

Amrous

Bocquet

Nony

et al. 2014

Adv Materials Inter

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Achieving control over formation of molecular films on insulating substrates is important for designing novel 2D functional materials and devices. To study the main factors governing successful control, organic molecules with interchangeable polar functional groups, a variable length aromatic body, and flexible hydrocarbon chains are designed, synthesized and then deposited on the (001) surfaces of bulk sodium chloride, potassium chloride, and rubidium chloride. The deposited structures are imaged using noncontact atomic force microscopy and modeled using density functional theory. The results show that it is possible to form large‐scale, highly ordered, 2D, porous molecular domains (>104 pores), which are stable at room temperature, and to control the size of the 2D pores. Alternatively, it is possible to form line structures or droplets (through molecular dewetting) by altering the molecular structure or changing the substrate lattice constant. Theoretical calculations explain the balance of the molecule–molecule and molecule–surface interactions and the structure and thermodynamic stability of the grown films.

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Section: Introductionmentioning

confidence: 99%

Molecular Design and Control Over the Morphology of Self‐Assembled Films on Ionic Substrates

Amrous

Bocquet

Nony

et al. 2014

Adv Materials Inter

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show abstract

“…nderstanding the mechanisms of adsorption, interaction, and assembly of atoms and molecules on insulating surfaces is critical to many areas of surface science, such as catalysis, 1 lubrication, 2,3 and molecular electronics. 4À6 Studies of individual molecules, molecular aggregates, and more complex structures at insulating surfaces often involve noncontact atomic force microscopy (NC-AFM).…”

mentioning

confidence: 99%

“…Understanding the mechanisms of adsorption, interaction, and assembly of atoms and molecules on insulating surfaces is critical to many areas of surface science, such as catalysis, lubrication, , and molecular electronics. − Studies of individual molecules, molecular aggregates, and more complex structures at insulating surfaces often involve noncontact atomic force microscopy (NC-AFM). − However, the interpretation of experimental images is difficult, and systematic high-resolution studies of individual molecules are still rare. It is widely acknowledged that knowing the structure of the NC-AFM tip apex is vital for our understanding and faithful interpretation of high-resolution NC-AFM images. , Using well-characterized, stable, and atomically sharp tips is essential for achieving atomic resolution when imaging molecules at surfaces and for accurately analyzing the experimental data.…”

mentioning

confidence: 99%

Using Metallic Noncontact Atomic Force Microscope Tips for Imaging Insulators and Polar Molecules: Tip Characterization and Imaging Mechanisms

Gao

Grenz²,

Watkins

et al. 2014

ACS Nano

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We demonstrate that using metallic tips for noncontact atomic force microscopy (NC-AFM) imaging at relatively large (>0.5 nm) tip-surface separations provides a reliable method for studying molecules on insulating surfaces with chemical resolution and greatly reduces the complexity of interpreting experimental data. The experimental NC-AFM imaging and theoretical simulations were carried out for the NiO(001) surface as well as adsorbed CO and Co-Salen molecules using Cr-coated Si tips. The experimental results and density functional theory calculations confirm that metallic tips possess a permanent electric dipole moment with its positive end oriented toward the sample. By analyzing the experimental data, we could directly determine the dipole moment of the Cr-coated tip. A model representing the metallic tip as a point dipole is described and shown to produce NC-AFM images of individual CO molecules adsorbed onto NiO(001) in good quantitative agreement with experimental results. Finally, we discuss methods for characterizing the structure of metal-coated tips and the application of these tips to imaging dipoles of large adsorbed molecules.

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Imaging Molecules on Bulk Insulators Using Metallic Tips

Gao

Schwarz

Shluger

2015

Noncontact Atomic Force Microscopy

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Frictional Properties of Molybdenum-Based Lubricating Oil Additives Using Green Chemistry

Cited by 5 publications

References 8 publications

Molecular Design and Control Over the Morphology of Self‐Assembled Films on Ionic Substrates

Molecular Design and Control Over the Morphology of Self‐Assembled Films on Ionic Substrates

Using Metallic Noncontact Atomic Force Microscope Tips for Imaging Insulators and Polar Molecules: Tip Characterization and Imaging Mechanisms

Imaging Molecules on Bulk Insulators Using Metallic Tips

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