Department of Chemical Engineering 313836

Fall 2014
Solution to Tutorial2
Question1
Question2
Synthesis methods for Nanomaterials:
Top Down method:
Photolithography
Beam Lithography
Nanoparticle Lithography
Scanning probe lithography
Colloidal lithography
Chemical Itching
Bottom up Lithography
Direct se
Department of Chemical Engineering 313836

Fall 2014
Solutions toTutorial4
1) Volume of pyramid: V=1/3 x12 x 1 =1/3
Volume of equivalent sphere: V=/6 x dv3 =1/3 dv
Surface area of pyramid: Spyramid = 3.236
Surface area of equivalent sphere: Ssphere = 2.325
Sphericity = Ssphere/ Spyramid = 0.72
2) Porosity
Department of Chemical Engineering 313836

Fall 2014
Solution to Tutorial3
Question1
The surface mean diameter is given by:
Since the size analysis is represented by the continuous curve:
Question2
SiO2 particle
Diameter = 10 nm
Density = 2.3 gcm
Specific surface area = surface area per unit mass
= (surf
Department of Chemical Engineering 313836

Fall 2014
Solution to Tutorial5
1) a. The surface tension determined by the differential capillary rise method is
described as
gr1r2 h
2 r1 r2
Inserting the numerical values gives
996kg / m 3 9.81m / s 2 0.7 10 3 m 0.5 10 3 m 6.8 10 3 m
2 (0.7 10 3 0.5 10 3 )
0
Department of Chemical Engineering 313836

Fall 2014
Solution to Tutorial1
Question1
A, microporous materials with Type I isotherm
Question2
Langmuir
BET method
Langmuir isotherm is applicable to the adsorption with monolayer. Usually, the real adsorption
involves multilayers of the adsorbates, therefor
Department of Chemical Engineering 313836

Fall 2014
Solution:
(a) Mass balance on the dust in the room:
( rate of )_ (rate offlow)_ (rate Offlow out)
accumulation into the room Of room with air
assuming constant gas density,
dC
V = 0.12 4C
dt
where 0.12 is the leak rate in m3/h, V is the volume of the room