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Large-area self assembled monolayers of silica microspheres formed by dip coating

Wang Y., Chen L., Yang H., Guo Q., Zhou W., Tao M.

Materials Science Poland

2010

Vol. 28, No. 2

467--478

Formation by dip coating of highly ordered and closely packed, self assembled monolayers (SAMs) of microsized silica spheres has been reported. Under optimized coating conditions, SAMs were formed with 2 žm diameter silica spheres on record-breakingly large areas, measuring 3×10 mm2 on silicon substrates and 1.5×11 mm2 on glass substrates. The SAMs structure and their spatial extension were significantly influenced by the concentration of the solution, withdrawal speed, immersion time, relative humidity, types of solvent and substrate material. The SAMs of silica microspheres provide a glimpse into the wide range of photonic applications for dip coating such as surface texturing and anti-reflection coatings.

Effect of growth time on the morphologies of vapour grown carbon fibres and a suggested mechanism of growth

Zhang H., Shi J., Song Y., Zhao J., Wang K., Guo Q., Zhai G., Liu L.

Materials Science Poland

2009

Vol. 27, No. 3

885--890

The microstructure of vapour grown carbon fibres is two-double layered. This paper addresses the question of morphology transformation of vapour grown carbon fibres. Special attention is given to developing understanding of the growth mechanism of the outer layer of the fibres. The influence of growth time on the morphologies of as-prepared carbon fibres was investigated using scanning electron microscopy. Results showed that with the prolongation of reaction time, their morphology changed from linear fibres to carbon micro-bead chains and then again to thicker linear fibres, which led to the increase of the carbon fibres diameters from 200 nm to several micrometers. Furthermore, several kinds of carbon fibres with special morphology such as carbon micro-beads, chains, etc., could be obtained by adjusting the growth time. A growth mechanism, henceforth referred to as fibre-bead-thicker fibre, for the outer layer of vapour grown carbon fibres is proposed.

Algorithms for Computing the [lambda]-regularities in Strings

Zhang H., Guo Q., Iliopoulos C.S.

Fundamenta Informaticae

2008

Vol. 84, nr 1

33-49

We introduce the notion of [lambda]-regularities in strings that consist of [lambda]-covers and [lambda]-seeds, and study three [lambda]-regularities problems- the [lambda]-cover problem, the general [lambda]-cover problem and the [lambda]-seed problem in this paper. [lambda]-regularities can be viewed as generalized string regularities in the sense that a set of [lambda] repetitive strings rather than a single repeated string are considered. We first present a general algorithm for computing all the [lambda]-combinations of a given string, since they serve as candidates for both [lambda]-covers and [lambda]-seeds. The running time of this algorithm is O(n2). Relying on this result, we answer the above mentioned three problems all in O(n2) time.