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.
