Saturday, January 6, 2007

Friday, January 5, 2007

Thursday, January 4, 2007

My little light tent

To get a better picture for the beaded model, I learned recently that I should use the light tent to control light. Here is a very simple light tent I made by putting a white shirt on a wire-framed molecular model, which is a dodecahedron itself, but large enough so that I can put the tiny beaded molecules inside. I am thinking about making a better light tent later on.

From Craft2

Here are some pictures I took a few days ago:

From Craft2

Two type II isomers:

shifted chiral
From Craft2

From Craft2

Beads with long aspect ratio

Append Huang showed me a curious C60 made of beads with large aspect ratio. The role of beads as chemical bonds is clearly shown by this model. However, there is a drawback for this type of beads, i.e. it cannot produce good steric repulsion between different beads. The structure of this ball is quite flexible. We can easily change its shape by pressing it slightly.

It seems to me the relation between bonds and steric energy in the beaded representation is just like "Fish and Bear's paw", one cannot get both at the same time.

Mencius said, "Fish is something I desire (yu); bear's paw [a Chinese delicacy] is also something I desire. If I cannot have both, I will forsake fish and select bear's paw."

To me the beads with large aspect ratio are the fish and the spherical beads are the bear's paw. I will choose spherical beads for the sake of the fullerene's geometry.

From Craft2

Wednesday, January 3, 2007

Classification of T240

The isomers of T240 can be classified into the following five basic types according to the spatial arrangement of heptagons:

Type I:
Small radius, D5d, D5

Type II:
Medium radius, D5d,D5

Type III:
Medium radius, D5d, D5

Type IV:
Large radius, D5d

Type V
Medium radius, D5h

Monday, January 1, 2007