Molecule

PICT0730

A knit version of the acrylonitrile molecule, as used in the production of acrylic fibres, represented as a ball and stick model.

This pattern is also available as a free PDF download, provided by ravelry.

NB: This pattern requires the knitter to crochet a chain to start each sphere.

Yarn : Any DK weight
Needles : 3.75mm DPNs
1 crochet needle (3.5 or 4mm)
Gauge : 20sts/29 rows to 4”

Ball

You will need seven of these to make your molecule: 3 in white (hydrogen), 3 in light grey (carbon), and 3 in blue (nitrogen).

Using scrap yarn, crochet a chain of 34 stitches. Knot the end.

Turn the chain over, and find the ‘bumps’ running down the centre of the chain – using DPNs, knit a stitch into each bump, until you have 32 stitches on your needles. Join to work in the round.

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Work as follows –

Row 1 : knit.
Row 2 : (k6, k2tog) to end (28 sts).
Row 3 : knit.
Row 4 : (k5, k2tog) to end (24 sts).
Row 5 : knit.
Row 6 : (k4, k2tog) to end (20 sts).
Row 7 : knit.
Row 8 : (k3, k2tog) to end (16 sts).
Row 9 : (k2, k2tog) to end (12 sts).
Row 10: (k1, k2tog) to end (8 sts).

Cut yarn leaving longish tail; run through these 8 sts and pull closed.

Undo knot in end of scrap yarn crochet chain, and begin to ‘unzip’, placing live stitches onto DPNs (32 sts in total).

Work rows 1-10; stuff ball with waste yarn or stuffing and close as before. Using a needle, run both ends through into the ball to hide ends.

Stick

These come in three varieties – single, double and triple. Leave a tail of around 10cm when casting on and off, to use when stuffing later.

Single bonds

You will need four of these – one in light grey, and three in light grey/white.

Single colour single bond

Cast on 9 stitches. Work I-cord for first couple of rows, then switch to DPNs.

Knit 14 rounds in total; cast off.

Two colour single bond

Cast on 9 stitches with light grey yarn. Work I-cord for first couple of rows, then switch to DPNs.

Knit 7 rounds in total; break yarn.

Join white yarn and knit further 7 rounds; cast off.

Double bonds

You will need two of these in light grey.
Cast on 6 stitches and work I-cord for 14 rows.
Cast off.

Triple bonds

You will need three of these in light grey/royal blue.

Cast on 6 stitches with light grey yarn. Work I-cord for 7 rows; break yarn.

Join royal blue yarn and knit further 7 rounds; cast off.

Stuff sticks firmly, using ends of yarn and waste yarn in the same colours.

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Assembly

Sew together as shown in top photo. It’s been a while since I went anywhere near a laboratory, so the positioning of the bonds is likely not 100% accurate, but all the atoms are in the right place – I didn’t want my molecule to be entirely flat, so I used a little artistic licence, but so long as you check that the balls are in the right place relative to one another, and you don’t have more than 4 bonds for each grey (carbon) ball, 3 for the blue (nitrogen) and 1 for the white (hydrogen), I reckon you’re laughing.

You could stuff jingly bells into the balls – I’ve also been thinking that pipe-cleaners inside the sticks might be an idea for bendy fun, if you aren’t going to let it anywhere near babies and/or small children… and toying with the idea of making various colours of ball, not stitching them together, and using velcro patches in the appropriate places.

Oh, and for maximum ha! value, it should be knitted using 100% wool.

PICT0734

More molecules – acetone, benzene and ethanol – can be found here –

A lot of balls