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401.
D.C. Meyer A. Klingner Th. Holz P. Paufler 《Applied Physics A: Materials Science & Processing》1999,69(6):657-659
After aging at room temperature for several months W/C multilayers (20 periods, single layer thicknesses in the nanometer
range) grown on Si-(111) substrates by pulsed laser deposition (PLD) developed homogeneously wrinkled surfaces. Their structures
were studied by optical microscopy, atomic force microscopy and X-ray diffractometry. Typical dimensions of debonded areas
are some 100 μm in length, about 40 μm in width and 2–3 μm in height. The formation of wrinkles is accompanied by an increase
in the free surface by 1–2%. Stress relaxation is considered the driving force of this phenomenon.
Received: 26 July 1999 / Accepted: 29 July 1999 / Published online: 16 September 1999 相似文献
402.
J.A. Cuesta R.P. Sear 《The European Physical Journal B - Condensed Matter and Complex Systems》1999,8(2):233-243
The interplay of interactions between micelles, and the aggregation of these micelles into large, highly anisotropic micelles,
is studied. Simple, hard-body, models of rod-like and disc-like micelles are used, which allows us to apply fundamental measure
theory to determine the free energy. Then we study the phase transition from the fluid phase to a liquid crystalline phase.
We find that aggregation induces a strongly first order transition from a fluid phase of small micelles to a close packed
liquid crystalline phase of infinitely large micelles.
Received: 3 December 1997 相似文献