There are two categories in the graphene preparations which top-down and bottom-up methods. Top-down methods consist of mechanical exfoliation, chemical exfoliation synthesis reduction. Meanwhile, vapor deposition (CVD), pyrolysis epitaxial growth under Graphene has its own limitation unsuitable for certain applications. Thus, functionalizing with selected molecules nanomaterials may result fun...

The mechanism of atomic-scale image formation in non-contact AFM on metallic surfaces is analysed using total-energy pseudopotential calculations. Depending on the tip–apex configuration, we find two different imaging modes. Both clean and metal contaminated Si tips provide atomic resolution arising from the very strong covalent tip–sample interaction, in striking similarity with the imaging me...

One of the striking results of protein thermodynamics is that the heat capacity change upon denaturation is large and positive. This change is generally ascribed to the exposure of non-polar groups to water on denaturation, in analogy to the large heat capacity change for the transfer of small non-polar molecules from hydrocarbons to water. Calculations of the heat capacity based on the exposed...

A two-dimensional nanoporous covalent organic framework can be prepared on a Au(111) substrate with near complete surface coverage and can be used to control the organisation of a sublimed layer of C(60).

Interchromophore interactions in flexible multidipolar structures for nonlinear optics were addressed by a combined experimental and theoretical study on two series of one-, two-, and three-chromophore systems in which identical push-pull chromophores are assembled through covalent and flexible linkers in close proximity. The photophysical and nonlinear optical properties (quadratic hyperpolari...

Molecular interactions underlie the whole of chemistry and biology. This tutorial review illustrates the use of rotameric folding molecules, topoisomers, atropoisomers, and tautomers as molecular balances for quantifying non-covalent interactions. This intramolecular approach enables a wide variety of interactions to be examined with a degree of geometric control that is difficult to achieve in...

A two-dimensional porphyrin covalent organic framework is solvothermally synthesized and the macroscopic structure and pore parameters can be synthetically controlled. A remarkable and positive COF size effect on the pore parameters enables such structural control with a synchronized feature.

We report a photoelectron imaging study of (OCS)-2 and compare the results to OCS-.H2O. Two electron-emission mechanisms are observed for the dimer anion: direct photodetachment and autodetachment, while OCS-.H2O exhibits only the direct mechanism. The results provide evidence of covalent (OCS)-2 coexisting with the OCS-.OCS cluster anion. The autodetachment originating from the covalent specie...

Unlike classical covalent polymers, one-dimensionally (1D) elongated supramolecular polymers (SPs) can be encoded with high degrees of internal order by the cooperative aggregation of molecular subunits, which endows these SPs with extraordinary properties and functions. However, this internal order has not yet been exploited to generate and dynamically control well-defined higher-order (second...