Electronic Field
The inner filling materials of capacitor require high
specific surface, so as to produce capacitor of smaller volume
but larger capacity. Likewise, in the design of ordinary
batteries, it is also necessary to consider the material's
specific surface area, in order to gain smaller volume and
larger storage power.
New energy Battery
New energy battery is the hot field for research
currently. It controls the proper stored energy density by
controlling the material's specific surface.
Paints and Coatings
Filler surface area of paints and coatings affects the
smoothness, texture, color, color saturation, brightness, solid
content and film's adhesion property. The porosity can control
the application program's performance, such as liquidity,
curing time and coating thickness, etc.
Catalyst
Catalyst's active specific surface area and pore
structure have great influence on the conversion ratio. Choose
the aperture size to filter or transit some substance
selectively, so as to create a selective catalyst, and
furthermore, produce the desired products.
Automobile Exhaust
Purification of resultants of the automobile exhaust
requires special catalyst material. The exhaust purification
using transition metal is of important practical significance
and economic value. The specific surface and porosity decide
the efficiency, service life and economical efficiency of the
exhaust conversion device.
Combustion control
In the research and development of rocket propellant and
explosive, the combustion rate is controlled by the material's
specific surface. If the speed is too high, it may be more
dangerous; or if the speed is too low, it may cause failure and
inaccuracy.
Active Carbon
Besides an extremely great carrier material, the active
carbon is also an ideal filtering material. The filtering
effects can be controlled by controlling the active carbon's
specific surface and porosity. It has important application in
the gas and liquid purification fields.
Pharmaceuticals
The tablet dissolution rate and medical effect action
time can be controlled by rationally distributing the effective
constituents of the medicines on the filler with certain
specific surface area and porosity.
Principle
Surface area and porosity are important physical
parameter of porous materials. They are usually measured via
physical adsorption. Choosing the proper gas adsorbate and
absorb the gas molecules onto the whole surface of the sample
detected on the cold bath conditions. Study the surface area
and porosity of the material via sensors indirectly.
Mesopore Analysis
On the condition of small partial pressure, only a small
amount of gas can touch the sample surface. In this case, the
adsorbate molecules move freely on the sample surface. With the
increase of adsorbate molecules, a layer of film will be formed
on the sample surface. Then the specific surface of the sample
can be calculated according to the BET and Langmuir
principles.
When the partial pressure increases, multiple layers of
adsorption will be formed on the sample surface. Multiple
layers of molecule accumulate inside the porosity forms the
condensation, named capillary condensation. The aperture can be
calculated by BJH, etc, accordingly the aperture distribution
diagram can be obtained.
When the adsorption balance pressure tends to be
saturate, the pore will be completely filled by adsorbates. In
this case, the total aperture and average aperture of the
measured material can be calculated, and the complete
adsorption isotherm can be worked out.
If adsorption saturated followed immediately by
desorption, the partial pressure can be reduced gradually, and
the adsorbates can be desorbed slowly from the pore, thus the
desorption isotherm can be drawn. We can judge the pore
structure and adsorb type via the adsorption, desorption
isotherms properties and hysteresis loop.
Micropore Analysis
As the pores of micro porous materials are very small,
the potential energy between the pore walls will be greater
than that of mess pores or macropores. Therefore, when
adsorbing on Micro porous materials, the micro porous surface
will be filled quickly, which usually happens on very small
partial pressure (< 0.*1). Present as isotherm, initial
segment of the isotherm of micropore sample will be very steep,
and then level off gradually.
The aperture of micropore is close to the molecular
diameter. Choosing proper absorbate will bring ideal
result.
Intelligent Feeding Technology
FINESORB****0 analyzer employs an intelligent gas feeding
system. The software will automatically choose precise feeding
or rough feeding depending on the preset pressure, and
intelligently judge the balance state, which avoids gas feeding
overshoot or gas feeding waiting for too long. Under
desorption, the gas feeding system first withdraws some gas
from the system, and then feeds gas to the preset pressure. The
system will automatically judge the amount of gas for
withdrawing, so as to ensure automatic gas feeding without
manual intervention during desorption.
Hardware Superiorities
Hardware
Vacuum System
FINESORB****0 analyzer employs 2 independent vacuum
systems, one for analysis station and the other for degassing
station, which allows degassing and analyzing at the same time,
and avoids the delay and error caused by using one vacuum
system. In addition, the independent systems completely
eliminate the effects of gas purity between degassing and
analysis.
Intelligent Degassing Station System
The degassing station can choose the proper degassing
temperature and degassing time depending on the sample
conditions. The degassing processed information can be saved as
files for future analysis on the effects of sample degassing
conditions for the results, so as to ensure the testing
conditions' traceability.
Volumetric Tank and Gas Feeding System
Volumetric tank adopts an integrative design to avoid
temperature deviation. Due to its compact structure, the
integrated volumetric tank has smaller dead volume, and the
measured results are more accurate. Installation and settlement
of structural sensor of integrated design are more rational and
easy for further expansion. The volumetric tank is demarcated
accurately. The volume repeatability error of gas feeding can
be ignored
Multi-Gas Support
FINESORB****0 analyzer supports to use N, Ar, Kr, Co, Co,
H and He as adsorbate. The instrument internally supports
analysis of multiple data models, so that more types of sample
can be analyzed.
Multiple Cold Bath Support
FINESORB****0 analyzer supports to use liquid nitrogen,
liquid oxygen, liquid argon and other cold baths. The
instrument internally supports adsorption models under multiple
cold bath conditions, which is easy for analyzing multiple
types of sample.
Temperature Maintaining System
Dewar flask with longer heat insulation time, sealing
soft cover and equipped with heat preserving case, the
temperature of the sample pipe can be maintained. The
instrument is also optionally equipped with a siphon system
which will automatically add liquid nitrogen when the liquid
level temperature drops.
High-precision Sensor
The instrument is equipped with a built in high-precision
resistance sensor and a Pirani-gauge sensor, which can detect
pressure from 1**0*6 Pa
to 2**05 Pa, so that the
mesopore and micropore adsorption and desorption can be
analyzed completely.
Cold Trap Filtering Device
FINESORB****0 analyzer is equipped with a cold trap
filtering device. It uses liquid nitrogen or the mixed solution
of liquid nitrogen and isopropanol as cold trap pool, so that
the vacuum degree can be enhanced.
Other Accessories
Off-line Degassing Station
This equipment can make preparation for specific surface
and pore capacity analysis for multiple sets of sample. Usually
the pollutants such as the steam and adsorbed gas are removed
from the sample surface or pore by using following gas or
vacuum in combination of heating device. The accuracy of the
specific surface and pore capacity analysis data largely
depends on the clean degree of the sample surface.
The common preprocessing equipments can use inert gases
like helium, nitrogen and argon or vacuum atmosphere. Off-line
degassing station can support 6 paths of sample
degassing.
LN2 Storage and Transmission
Liquid nitrogen requires special containers to store. The
common capacity of containers for laboratory use has several
sizes ranging from *0 L to **0L. Customers can choose the
liquid nitrogen tank with proper capacity according to the
laboratory’s use frequency,
Liquid Nitrogen Siphon Equipment
Depending on the laboratory condition, customers can
choose manual or automatic siphon equipments to facilitate
adding liquid nitrogen from the liquid nitrogen tank to the
Dewar flask. This equipment is optional, for concrete choices,
please contact *********6.
Reference materials
Usually reference materials are required for test to
verify the instrument’s performance in china, GBW (E)
******-GWE (E) *****9 standard substances are used for
verifying the specific surface. Internationally, standard
substances of NIST are used.
During the actual usage, some substances which have been
tested by different authorities will be used for reference,
such as white carbon black, molecule sieve, crystal ball and
active carbon, etc.
Vacuum Pump
During usage, the instrument requires equipping sliding
vane rotary vacuum pump and molecular pump and molecule pump,
The vacuum pump performance is directly related to the vacuum
pump. During purchase, pump is an item of the list; customers
can choose the appropriate pump according to their needs. In
addition, different pump models are chosen for degassing
station and analysis station. Please call *********6
Ultrahigh vacuum
Take the optional micro molecular pump as a secondary
pump, which can increase the vacuum system to high vacuum.
Equipped with Pirani vacuum gauge, the micropore measurement
can be performed or the krypton can be used for specific
surface analysis.
Software Overview
FINESORB****0 software is based on Windows interface. The
software interfaces are simple, clear and easy operation. By
using the software, we can set the adsorbate and sample
parameters, control the degassing station and analysis station,
and control the automatic completion of adsorptions and
desorptions. Via the software, we can also view the data after
test, generate reports and then print, edit and cut the
reports, and export the data to a txt file, which is easy for
interaction with the softwares like ORIGIN.
Software Control
The instrument schematic diagram is displayed on the
screen, including the valve state and the pressure sensor
values, both of which will be shown on the software interface
at the same time. The software will automatically judge the
operation on the electromagnetic valve according to the preset
pressure, and draw isotherm. The software can also support
manual control mode, such as the manual operation for the
elevator and the electromagnetic valve. The software uses the
**5 protocol for control, and supports extended control over
multiple instruments.
Report Preview
The software can display the reports generated by
different algorithmic models on the screen, and allows editing,
copying, printing and exporting them. We can also compare the
data and check the repeatability of different results via
it.
Data Export
The data in the report can be exported to txt files, easy
for interaction with ORIGIN. The graphs in the report can also
be copied to the pasteboard, easy for copying to WORD documents
for further editing.
Software Controlling Gas Feeding
Software features
The software chooses precise gas feeding or rough gas
feeding mode automatically depending on the preset pressure,
which ensures higher measurement efficiency. The gas feeding
mode is intelligent, which can finely tune the gas feeding rate
according to the steel cylinder outlet pressure, and prevent
pressure overshoot. The intelligent controlled preset pressure
option determines a lot the reliability and smooth of isotherm,
complied with the mesporous-based samples, can preset pressure
on a higher point; and for micropore, must preset on a very low
point. Otherwise, samples volumes also influence the preset
pressure. While adding samples, we can choose proper preset
pressure according to the samples’ specific surface, relative
experience please refer “Operation Handbook”.
Software Analyzing Model
According to the isotherm obtained from tests, different
test results can be obtained by using different analyzing
models. By using BET or Langmuir model, the total specific
surface can be calculated; by using t-Plot model, the inner
specific surface and outer specific surface can be calculated;
by using BJH model, the porosity of mesoporous materials can be
calculated; by using HK/SF model, the porosity distribution of
microporous materials can be calculated. The research on pore
is also being improved, new technologies appears
constantly.
