Basic HTML Version
14
16
18
m
Fully porous 5 um
Fully porous 3 um
The next generation to Core Shell particle
Superficially porous silica
“SunShell “ is a core shell silica column made by ChromaNIk Technologies.
Features of SunShell
*1.6
µ
m of core and 0.5
µ
m of superficially porous silica layer
*Same efficiency and high throughput as a Sub 2
µ
m particle
*Same pressure as a 3
µ
m particle (less than a half then a sub 2
µ
m particle)
*Same chemistry as Sunniest technology (reference figure 1)
*Good peak shape for all compounds such as basic, acidic and
chelating compounds
*High stability ( pH range for SunShell C18, 1.5 to 10)
* Low breeding
O
Si
OH
Si
Si
O
O
O
O
Si O
O
Si
O
Si
O
Si
Si
O O
O
O
Si
O
Si
O
Si
Si
O
O
Si
O
Si
Si
O
O O
O
Si
O
Si
O
O
O
O Si
Si
Si
O
O
O
O
Si
OSi
O Si
Si O
O
O
O
O
O
Si
O
Si
Si
O
O
O
O
O
O
Si
OSi
O
Si
Si
OH
O
O
O
Si
O
Si
O
Si
OO
O
O
Si
OH
O
Final TMS
Schematic diagram of bonding of SunShell C18
0.5
µ
m
2.6
µ
m
C
o
r
e
0.5
µ
m
C
o
r
e
Porous silica
2.6
µ
m
Schematic diagram of a core shell silica particle
1.6
µ
m
A term : Eddy diffusion(dp is particle diameter)
B term : Longitudinal diffusion
Van Deemter Equation
SunShell C18 shows same efficiency as a sub 2
µ
m
C18. In comparison between fully porous 2.6
µ
m and
core shell 2.6
µ
m (SunShell), SunShell shows lower
values for A term, B term and C term of Van Deemter
equation. The core shell structure leads higher
performance to compare with the fully porous structure.
Furthermore back pressure of SunShell C18 is less
than a half to compare with sub-2
µ
m C18s.
Comparison of plate height plots
0
2
4
6
8
10
12
0
5
10
15
HETP,
µ
Mobile phase velocity, mm/sec
Fully proous 1.8 um
SunShell 2.6 um
Column: C18, 50 x 4.6 mm C18
Mobile phase: Acetonitrile/water=(60/40)
Temperature: 25
o
C
Sample : Naphthalene
Fully porous 2.6 um
0
5
10
15
20
25
30
35
40
45
0
0.5
1
1.5
Back pressure, MPa
Flow rate, mL/min
Sunniest C18-HT 2.0 um
Brand A C18 1.9 um
Brand B C18 1.8 um
Brand C C18 1.7 um
Brand D C18 2.6 um
SunShell C18 2.6 um
Comparison of back pressure for high throughput columns
Column dimension: 50 x 2.1 mm
Mobile phase: Acetonitrile/water=(70/30)
Temperature: 25
o
C
(Dm is diffusion coefficient)
C term : Mass transfer
H
u
A term
B term
C term
Van Deemter plot
Website : www.chromtech.net.au E-mail : info@chromtech.net.au TelNo : 03 9762 2034 . . . in AUSTRALIA