CN207114376U - The liquid-adding device of apparatus for measuring contact angle - Google Patents
The liquid-adding device of apparatus for measuring contact angle Download PDFInfo
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- CN207114376U CN207114376U CN201721170806.0U CN201721170806U CN207114376U CN 207114376 U CN207114376 U CN 207114376U CN 201721170806 U CN201721170806 U CN 201721170806U CN 207114376 U CN207114376 U CN 207114376U
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Abstract
The utility model discloses the liquid-adding device of apparatus for measuring contact angle, including frame, bottom of the frame is provided with motor, and motor upper end is provided with screw mandrel, feed screw nut is arranged with screw mandrel；Frame inner wall is provided with line slideway, and line slideway is provided with guide rail slide block；The feed screw nut is fixed on guide rail slide block, and guide rail slide block side wall is provided with plunger fixture, is provided with syringe fixture below plunger fixture, syringe fixture is fixed in frame；The frame side is provided with syringe, and syringe includes syringe, is provided with plunger in syringe, syringe is fixed on syringe fixture, and plunger is fixed on plunger fixture；The syringe lower end is connected with liquid feeding needle tubing.Liquid feeding precision of the present utility model is high.Because with double mode liquid adding functions, the utility model can both simplify measuring process to improve the automation of measurement by contactless liquid feeding, while expand the application of measurement；It can switch again between different liquid feeding patterns to be adapted to the requirement of measurement apparatus multipurpose measurement.
Description
Technical field
A kind of liquid-adding device is the utility model is related to, particularly a kind of liquid-adding device of apparatus for measuring contact angle.
Background technology
In numerous surface/interface measurements, the method characterized, Contact Angle Measurement Technique conduct of the liquid in the surface of solids
A kind of surface analysis, characterization technique, there is relatively easy instrument and equipment, relative low price, easy to operate, measuring condition to approach
Many advantages, such as practical service environment, acquisition contain much information, so in recent years, these measuring methods are widely used in basis
Theoretical research, the research and development of new product and the quality control of field of industrial production, the demand of this quasi-instrument is also increased year by year.
Contact angle of the liquid in the surface of solids is measured, one of important step is to need to form one in the surface of solids
Drop (seat drip, sessile drop), then can by image (the side or overhead view image) shape analysis to drop and
Calculate and obtain the related physical quantities such as contact angle.As a rule, according to the actual conditions of testing sample, it is desirable in a comparison
Wide scope can control formation, droplet size for measurement.
The liquid feeding mode of Contact-angle measurement is divided into two kinds：When contacted by liquid with sample surfaces realize liquid transfer and
The contact liquid feeding method of drop is formed, the liquid-adding device using the method is mostly syringe pump or syringe；First, by right
Liquid pressing or extruding assign liquid enough (dynamic) energy, while control the outflow of liquid, make it in needle tubing/jet expansion shape
Fly into drop or liquid stream (jet) and voluntarily the contactless liquid feeding method of (stream) from needle tubing/jet expansion, use adding for the method
The outflow of liquid device generally use miniature valve control liquid and elution volume.Two kinds of above-mentioned liquid-adding devices all may be only available for respectively
From method.
The syringe pump of contact liquid feeding can relatively accurately control the volume of liquid feeding, and can carry out two-way liquid feeding.
In use, the needle tubing (or capillary) for forming drop is leaving the position of the segment distance of the surface of solids one (such as 3-10mm) first,
By controlling liquid volume added, the hanging drop of a designated volume is formed in needle tubing lower port, then by relative movement, allows hanging drop to approach
Sample surfaces, hanging drop is transferred on sample surfaces by contact of the hanging drop lower end with sample surfaces and forms a drop.Opening
Begin before or after measuring, then allow needle tubing (or capillary) to be separated with sample surfaces by relative movement.But this operation phase
When cumbersome, compare and lose time, and extra difficulty and obstacle are brought to the further automation of measuring method.
Foregoing contactless liquid-adding device, although the volume of its liquid feeding can be by controlling various parameters (such as simultaneously
Pressure, valve apertures and valve service time etc.) it is adjusted, but the actual volume finally obtained also liquid body attribute and use
The influence of the factors such as environment, it is relative.The absolute value of the device liquid feeding volume must be by each combination (liquid/pressure
Power/valve apertures/valve service time/...) actual measurement and the calibration curve obtained by using could obtain, and easily
Influenceed (purity liquid/change of temperature/pressure/valve apertures in use etc.) by various parameters.For without
The liquid of measurement or combination, it can not directly specify liquid feeding volume.
Due to the limitation on this body structure, above-mentioned contactless liquid-adding device does not possess two-way liquid adding functions, can not resorption
Liquid.In contact angle measuring method, due to the contact in actual solid (such as almost all of macromolecule) surface generally existing
Angle hysteresis, not only need to measure so-called static (static) contact angle, and be frequently necessary to measure liquid in solid table
The dynamic contact angle in face, it includes dynamic advancing contact angle and receding contact angle.Information only by obtaining dynamic contact angle
Wetness attributes (M.Strobel, C.S.Lyons, An Essay the on Contact of the surface of solids can be just fully described by
Angle Measurements,Plasma Process and Polymers 2011,8,8-13).One conventional measurement is moved
The method of state advancing contact angle and receding contact angle is by allowing drop (seat drop) volume constantly, slowly to expand and reduce
Means (droplet size increase and decrease method), should be increased by output liquid by drop here, also will be by drawing back liquid by drop again
Reduce.So the liquid dispensing apparatus for not drawing back function can not just be applied to retreat to enter Mobile state by reducing droplet size
The measurement of contact angle, the information of complete dynamic contact angle also can not be just obtained by this method.
Secondly, common optical contact angle measuring instrument is except that can carry out contact angles and wetting of the liquid in the surface of solids
Measurement, can also measure liquid surface/interfacial tension.By the graphical analysis of liquid/stream-hanging drop to formation, can obtain non-
The often accurately surface/interface tension value of liquid/stream-system, and compared with traditional surface tension instrument based on dynamometry, this
The application of method is wider, and operation is simpler, and automaticity is high.So liquid configured in common contact angle measurement
(or fluid) distribution system is except the drop for producing certain volume in the surface of solids is in addition to carrying out Contact-angle measurement, going back
Equally it is used for forming the hanging drop for being suspended on needle tubing port to carry out the measurement of surface/interface tension force.Using based on describing above
(with miniature valve or piezoelectric unit) non-contact liquid distributor can not also be used to directly to be formed at present hanging drop or
Person is controlled or modulated exactly (including reducing volume) in measurement process to the volume of hanging drop, because its liquid feeding mode
It is unidirectional.So such liquid feeding method can not also realize that same liquid-adding device can be used for different measuring methods or mould
The general purpose of formula.
Utility model content
The purpose of this utility model is, there is provided the liquid-adding device of apparatus for measuring contact angle.Liquid feeding essence of the present utility model
Degree is high.Due to two-way liquid adding functions, therefore the utility model can both realize contactless liquid feeding, simplify measuring process with
The automation of measurement is improved, while expands the application of measurement；Two-way liquid feeding and contact liquid feeding can be realized again, it is suitable with this
Requirement with the measurement of measurement apparatus multipurpose.
The technical solution of the utility model：The liquid-adding device of apparatus for measuring contact angle, including frame, bottom of the frame are provided with electricity
Machine, motor upper end are provided with screw mandrel, feed screw nut are arranged with screw mandrel；Frame inner wall is provided with line slideway, and line slideway is provided with
Guide rail slide block；The feed screw nut is fixed on guide rail slide block, and guide rail slide block side wall is provided with plunger fixture, is set below plunger fixture
There is syringe fixture, syringe fixture is fixed in frame；The frame side is provided with syringe, and syringe includes syringe, pin
Plunger is provided with cylinder, syringe is fixed on syringe fixture, and plunger is fixed on plunger fixture；The syringe lower end, which is connected with, to be added
Liquid needle tubing.
In the liquid-adding device of foregoing apparatus for measuring contact angle, the highest liquid feeding speed of the liquid-adding device is not less than 27-
85μl/s。
In the liquid-adding device of foregoing apparatus for measuring contact angle, it is provided with below described guide rail slide block on motor end face
The limit position sensor of side；Described upper rack is provided with connection socket.
Compared with prior art, the utility model can reach higher highest liquid feeding speed, while liquid feeding velocity interval is non-
Constant width, and there is matched liquid feeding acceleration range, contactless liquid feeding is supported with this.Compared to based on valve control
The non-contact liquid feeding mode of system, the utility model can directly, definitely by the non-contact liquid feeding mode of motor driven syringe
The volume of liquid feeding is specified on ground, is needed not move through and is measured and establish calibration curve in advance, is not also influenceed substantially by environmental factor.
The utility model has two-way liquid adding functions, that is, can both export (fluid), can also pumpback (fluid).When
When the setting of liquid feeding speed is more than a critical value, and under the cooperation of suitable liquid feeding acceleration, because liquid is in the extremely short time
It is interior to obtain enough energy, it just can after drop is formed, quite neatly realize from the separation of needle tubing port and voluntarily from
Open, fly to specified surface of solids position, form seat drop, the measurement for contact angle and relevant parameter.Now this practicality
It is new using contactless liquid feeding pattern, Gu greatly simplify the survey of contact angle and related fluid/stream/- wetting characteristics parameter
Operating procedure is measured, improves the speed of measurement, is advantageous to further improve the automaticity of measurement.And contribute to further
Application and occasion (such as the survey applied to fast on-line measurement or non-smooth/non-horizontal surface of e measurement technology are expanded
Amount).
When the setting of liquid feeding speed is less than critical value, now the utility model is changed into contact, available for various patterns
Lower contact angle (measurement for including complete dynamic contact angle) and the measurement of correlative, it can be used for the table based on hanging drop analysis again
The measurement of face/interfacial tension, because liquid-adding device has two-way liquid adding functions, it can not only realize the complete of stalagmometry
Automation, and the control or modulation to drop can be realized in whole measurement process, realize full-automatic, long-time dynamic table
The measurement of face tension force and for studying viscoelastic surfactant fluid unisexuality modulus etc..
To sum up, liquid feeding precision of the present utility model is high.Due to different liquid feeding patterns and two-way liquid adding functions, therefore this
Utility model can both realize contactless liquid feeding, simplify measuring process to improve the automation of measurement, while expand measurement
Application；It can switch again in contact type/non-contact type liquid feeding and two-way liquid feeding isotype, it is more to be adapted to measurement apparatus with this
The requirement of purposes measurement.
Brief description of the drawings
Fig. 1 is structural representation of the present utility model；
Fig. 2 is the distribution of the 2 μ l and 4 μ l droplet sizes by non-contact liquid feeding pattern formation in the utility model embodiment
Figure；
Fig. 3 is the distribution map of the 0.5 μ l droplet sizes by non-contact liquid feeding pattern formation in the utility model embodiment.
Reference：801- motors, 802- screw mandrels, 803- feed screw nut, 804- guide rail slide blocks, 805- line slideways,
806- connection sockets, 807- limit position sensors, 808- plunger fixtures, 809- syringe fixtures, 810- frames, 820- injections
Device, 821- syringes, 822- plungers, 823- liquid feeding needle tubings.
Embodiment
With reference to embodiment, the utility model is described in further detail, but be not intended as to the utility model limitation according to
According to.
Embodiment：The liquid-adding device of apparatus for measuring contact angle, form as shown in figure 1, including frame 810, the bottom of frame 810
Provided with motor 801, the upper end of motor 801 is provided with screw mandrel 802, and feed screw nut 803 is arranged with screw mandrel 802；The inwall of frame 810 is provided with
Line slideway 805, line slideway 805 are provided with guide rail slide block 804；The feed screw nut 803 is fixed on guide rail slide block 804,
The side wall of guide rail slide block 804 is provided with plunger fixture 808, and the lower section of plunger fixture 808 is provided with syringe fixture 809, syringe fixture 809
It is fixed in frame 810；The side of frame 810 is provided with syringe 820, and syringe 820 includes syringe 821, set in syringe 821
There is plunger 822, syringe 821 is fixed on syringe fixture 809, and plunger 822 is fixed on plunger fixture 808；The syringe 821
Lower end is connected with liquid feeding needle tubing 823.The syringe 820 that the present embodiment uses is μ l of a volume 500, total kilometres 30mm accurate glass
Glass syringe, liquid feeding needle tubing 823 are an external diameter 0.5mm/ internal diameters 0.25mm, overall length 53mm stainless steel needle tubing.
The highest liquid feeding speed of the liquid-adding device is not less than 27-85 μ l/s.
The described lower section of guide rail slide block 804 is provided with the limit position sensor 807 above the end face of motor 801；It is described
The top of frame 810 be provided with connection socket 806.Connection socket 806 is used to connect motor 801 and motor drive controller.The limit
Position sensor 807 is used for the zero position for determining syringe plunger 822, while prevents guide rail slide block 804 or be fixed on guide rail cunning
Part on block 804 collides with other parts.
Described motor 801 can use stepper motor, can also use servomotor, motor 801 and motor drive controller
Connection, motor drive controller are connected with computer by RS232 or RS485, controlled by application software.
The utility model contactless liquid shares out the work critical speed required for pattern and minimum acceleration (and therewith
Related motor driving/control parameter) and the liquid character of use and the size and attribute of liquid feeding needle tubing, and the liquid feeding needed
Volume or volume range are relevant, can be automatically adjusted by testing regulation or software accordingly to complete.The automatic tune of software
Section be based on to each conventional liquid and liquid feeding needle tubing combination, associated fluid kinetic theory (Weber numbers/
Ohnesorge numbers, referring to following technical proposals) guidance under, pass through pre-trial obtain experience working curve.Selection is suitable
Parameter satellite droplet (satellite drops) formation can also be reduced or avoided as far as possible.Required liquid volume added or
Scope and liquid character determine the suitable dimension or scope and the table of corresponding making material or/and needs of liquid feeding needle tubing again
Face is handled.By using external diameter in the different sizes of 0.1-2mm scopes and the liquid feeding needle tubing of making material, it is possible to achieve drop body
The random change of long-pending in the range of 0.1-30 μ l (this scope is applied to water, will be shifted for other liquid number ranges)
Change, this volume range almost entirely covers the drop size range commonly used in Contact-angle measurement application.Due to same chi
Very little liquid feeding needle tubing can be generally used for forming the quite broad various sizes of drop of volume range, so upper not in use
Need often to change liquid feeding syringe size, for example, external diameter 0.5mm (interior through 0.2-0.3mm) stainless steel liquid feeding needle tubing can by with
In forming water droplet of the volume in the range of 0.5-10 μ l, substantially it is adapted to most Contact-angle measurement application.If necessary to more
During the drop of small size, it can change that an external diameter is smaller into, such as 0.3mm liquid feeding needle tubing.
It is 2 μ l to set liquid volume added by application software, and liquid feeding speed is 35 μ l/s.Under this non-contact liquid feeding mode,
Second row in volume (volume of drop is analyzed to calculate by Liquid particle image and obtained) distribution such as Fig. 2 of 40 drops continuously generated
Shown in drop, average external volume is 1.99 μ l, and standard error is 0.12 μ l.
Change liquid volume added is 4 μ l, and the liquid feeding speed used is 30 μ l/s.Under this non-contact liquid feeding mode, continuous production
Volume (volume of drop is analyzed to calculate by Liquid particle image and obtained) distribution of 40 raw drops is such as the first row drop institute in Fig. 2
Show, average external volume is 4.03 μ l, and standard error is 0.10 μ l.
Change liquid feeding parameter again, liquid volume added changes into 0.5 μ l, and liquid feeding speed (is realized non-in 38 μ l/s under conditions present
Contact the minimum liquid feeding speed of liquid feeding pattern) more than.Fig. 3 is given under this non-contact liquid feeding mode, 40 continuously generated
Volume (volume of drop pass through Liquid particle image analysis calculate obtain) distribution of individual liquid, average external volume is 0.49 μ l, standard error
Difference is 0.02 μ l.
From the result of three different liquid feeding volumes above it can also be seen that the utility model is even in non-contact liquid feeding mould
Under formula, can also directly, utterly specify liquid feeding volume, and the repeatability of liquid feeding volume is good.
Technical scheme：The highest liquid feeding velocity computation process for the liquid-adding device that the utility model uses is as follows：
When a density is ρ, surface tension γ, the fluid that viscosity is η from a needle tubing mouth/jet hole flowed out with speed when, its
Specific outflow form can substantially be estimated by Weber numbers (We) and Ohnesorge numbers (On)：
D in above formula represents the characteristic length of system, can refer to the diameter of needle tubing mouth/jet hole or caused drop
Diameter.Whether Weber numbers are shown when drop or liquid flow out from needle tubing/jet expansion has enough kinetic energy to overcome flowing
During resistance and exit surface tension of liquid, and come off from outlet, form a drop (free that can voluntarily fly
Flying droplet) leave away.When this numerical value is relatively low (when generally believing less than 8), liquid does not have enough kinetic energy to overcome
Surface tension, thus can only be formed in outlet hanging drop, slowly grow up, it is big to a certain extent when come off due to gravity
(dripping regime).Practical experience shows only when Weber numbers exceed a certain critical value, and liquid could be voluntarily to fly
The form of row drop leaves outlet.For the relatively low liquid of the viscosity such as water, it is considered that when Weber numbers are greater than about 12, liquid
Can produces a size and the similar voluntarily flight drop of outlet size；But when Weber numbers are more than 40 or so, the liquid of outflow
Body is atomized because kinetic energy is too big, forms the drop (atomization regime) of one tiny diverging.For viscosity
The significantly liquid high compared with water, it is also necessary to consider influence of the viscosity to this process, Weber numbers critical value now need to pass through
Ohnesorge numbers On is corrected as follows:
WeCritical=12 (1+1.07 × On1.6)
Above formula surface：Ohnesorge numbers are higher, into the Weber number critical values in voluntarily flight drop outflow form region
Also it is higher.
For liquid water in atmosphere：ρ=1000kg/m3, γ=0.072N/m.
If it is assumed that the size (diameter) of the drop intentionally got (corresponds to the liquid of about 0.1-30 μ l volumes in 0.6-4mm
Drop) scope, i.e. D when requiring Weber numbers in critical value more than 12, can calculate liquid in 0.6-4mm scopes from We formulas
Flowing velocity be at least 0.465m/s (when drop size is 4mm) and arrive 1.2m/s (when drop size is 0.6mm)：Drop
Size it is smaller, required speed is higher.The internal diameter of the liquid feeding needle tubing used is assumed again that as 0.25mm, its corresponding sectional area
For 0.0491mm2.The volume flow rate scope corresponding with the liquid flow velocity limits of above-mentioned requirements be 23ul/s (when
When drop size is 4mm) arrive 59ul/s (when drop size is 0.6mm).If consider further that other possible (energy) consumption
With necessary safety coefficient, it is necessary to which highest volume flow rate is scheduled on about 27ul/s to 70ul/s.
For some conventional liquid (η similar in viscosity and water<10mPas), due to the ratio between their density and surface tension
Value will be less than water, be easier to overcome the effect of surface tension and form the drop voluntarily to fly under condition of similarity, so this
One volume flow limit value scope is also sufficiently high for these liquid.The conventional contact angle of water is significantly greater tnan for viscosity
Liquid (η is used in measurement>10mPas), it is assumed that highest viscosity is 100mPas, surface tension value about 45mN/N, density 1g/ml, right
The On values answered are below 0.65.After the influence of Ohnesorge numbers is considered, the minimum speed of liquid flowing at least will be about
More than 1.5m/s, just can guarantee that 0.6mm sizes drop enter desired by voluntarily flight droplet area.If consider further that others
Possible (energy) consumption and necessary safety coefficient, it is necessary to which highest volume flow rate is scheduled on more than 85ul/s.
Estimation and consideration based on more than, one when being generally used for class of liquids and the measurement of Contact-angle measurement with respect to majority
As the droplet size scope that uses, the highest liquid feeding speed that liquid-adding device can reach is scheduled on not less than 27-85 μ l/s.
Claims (3)
1. the liquid-adding device of apparatus for measuring contact angle, it is characterised in that：Including frame (810), frame (810) bottom is provided with motor
(801), motor (801) upper end is provided with screw mandrel (802), and feed screw nut (803) is arranged with screw mandrel (802)；Frame (810) inwall
Provided with line slideway (805), line slideway (805) is provided with guide rail slide block (804)；The feed screw nut (803), which is fixed on, leads
On rail sliding block (804), guide rail slide block (804) side wall is provided with plunger fixture (808), and syringe is provided with below plunger fixture (808)
Fixture (809), syringe fixture (809) are fixed in frame (810)；Frame (810) side is provided with syringe (820),
Syringe (820) includes syringe (821), is provided with plunger (822) in syringe (821), syringe (821) is fixed on syringe fixture
(809) on, plunger (822) is fixed on plunger fixture (808)；Syringe (821) lower end is connected with liquid feeding needle tubing (823).
2. the liquid-adding device of apparatus for measuring contact angle according to claim 1, it is characterised in that：The liquid-adding device is most
High liquid feeding speed is not less than 27-85 μ l/s.
3. the liquid-adding device of apparatus for measuring contact angle according to claim 1, it is characterised in that：Described guide rail slide block
(804) lower section is provided with the limit position sensor (807) above motor (801) end face；Described frame (810) top is set
There is connection socket (806).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721170806.0U CN207114376U (en) | 2017-09-13 | 2017-09-13 | The liquid-adding device of apparatus for measuring contact angle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721170806.0U CN207114376U (en) | 2017-09-13 | 2017-09-13 | The liquid-adding device of apparatus for measuring contact angle |
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| CN207114376U true CN207114376U (en) | 2018-03-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505236A (en) * | 2017-09-13 | 2017-12-22 | 宁波新边界科学仪器有限公司 | A kind of contact angle measuring method and its device with new liquid distribution method |
| CN110286064A (en) * | 2019-08-05 | 2019-09-27 | 贵州大学 | A kind of mineral grain wetability measuring device and its measurement method |
-
2017
- 2017-09-13 CN CN201721170806.0U patent/CN207114376U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107505236A (en) * | 2017-09-13 | 2017-12-22 | 宁波新边界科学仪器有限公司 | A kind of contact angle measuring method and its device with new liquid distribution method |
| CN110286064A (en) * | 2019-08-05 | 2019-09-27 | 贵州大学 | A kind of mineral grain wetability measuring device and its measurement method |
| CN110286064B (en) * | 2019-08-05 | 2021-07-27 | 贵州大学 | Mineral particle wettability measuring device and measuring method thereof |
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