NEGATIVE
THERMAL EXPANSION
OF ZEOLITES PROJECT
BY SINEAD, ILARIA, ISSY, DAVE AND SID
WHAT ARE ZEOLITES ?

Zeolites are microporous crystalline solids with
well-defined structures.
ZEOLITES
THAT WE LOOKED AT
Do
SBE, MRE and
RHO show negative
thermal expansion?
Generally, materials expand when heated
because the particles gain kinetic energy and so
vibrate more.
 Some of theses zeolites decrease in volume when
heated.

HOW WE
DID IT
We collected data about the zeolite structures
 All the operations were done on the Linux
operating system
 The number of SI and O atoms were entered,
and we changed certain variables to run the test.
 The data was then analysed.

SBE
0
10
86
163
240
316
393
470
546
623
Change in length size/ A
-0.05
-0.1
x Length
Y Length
z
-0.15
-0.2
-0.25
Temperature/ K
41900
Average Volume A^3
41800
41700
41600
41500
41400
41300
41200
0
100
200
300
400
Average Temperture /K
500
600
700
800
MRE
0
10
86
163
240
316
393
470
546
623
Change in length size/ A
-0.05
-0.1
x Length
Y Length
z
-0.15
-0.2
-0.25
Temperature/ K
41900
Average Volume A^3
41800
41700
41600
41500
41400
41300
41200
0
100
200
300
400
Average Temperture /K
500
600
700
800
“Zeolite RHO has an unusual
three dimensional monolayer
surface with a topology that
gives equal access to either
side of the surface.”
The change in volume with temperature
29600
29500
29400
y = 0.001x2 - 1.3645x + 29669
29300
29200
29100
0
100
200
300
400
500
600
700
800
Temperature
The change in
length with temperature
30.96
30.94
30.92
Average length
Average Volume (cm3)
29700
30.9
30.88
30.86
30.84
30.82
30.8
30.78
0
100
200
300
400
Temperature
500
600
700
800
CONCLUSIONS
THE END!!
  