CN104406892A - Interface tension and contact angle test device and method based on analytical balance - Google Patents

Interface tension and contact angle test device and method based on analytical balance Download PDF

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CN104406892A
CN104406892A CN201410722554.2A CN201410722554A CN104406892A CN 104406892 A CN104406892 A CN 104406892A CN 201410722554 A CN201410722554 A CN 201410722554A CN 104406892 A CN104406892 A CN 104406892A
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platinum plate
contact angle
sample
analytical balance
tension
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施建辉
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SHANGHAI SOLON INFORMATION TECHNOLOGY Co Ltd
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SHANGHAI SOLON INFORMATION TECHNOLOGY Co Ltd
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Abstract

The invention discloses an interface tension and contact angle test device and method based on an analytical balance. The device comprises a lifting system, a lifting system bracket, a constant-temperature sample pool, a sample table and a weighing system, wherein the weighing system comprises a platinum plate, a platinum plate bracket, a hook bracket, a sample bracket and the analytical balance; one side of the sample table is fixedly mounted at the output end of the lifting system; the constant-temperature sample pool is mounted on the sample table; the platinum plate is arranged in the constant-temperature sample pool and mounted at the top end of the sample bracket through the platinum bracket and the hook bracket; the bottom end of the sample bracket is mounted on the analytical balance. The device can be widely applied to the industry fields of daily chemicals, pesticides, petrochemical engineering, surfactant research, fire control, electricity and the like, and has a very high promotion value.

Description

A kind of interfacial tension based on analytical balance and contact angle proving installation and method
Technical field
This patent discloses a kind of analytical balance that adopts as LOAD CELLS, utilizes the structure of the existing upper tray of analytical balance or side hanging prop dish, increases one set of lifting mechanism, realize the device of interfacial tension, surface tension and contact angle measured value.By this device, can realize that an instrument completes that analytical balance is weighed, the measurement of table/interfacial tension under density balance and weighing principle and contact angle, reach the object of a tractor serves several purposes.Method of testing to have employed based on the correction of Young-Laplace equation and in conjunction with the standing type adopting platinum plate law technology of Wilhelmy plate method formula, dynamic test surface tension, contact angle and interfacial tension value.The technology that this patent relates to can be widely used in the industry-by-industry fields such as daily use chemicals, agricultural chemicals, petrochemical complex, surfactant research, fire-fighting, electric power, has high promotional value.
Background technology
Adopting platinum plate method (Wilhelmy plate method) proposes (about alcohol capillary constant to by the dependence Ueber die Abhangigkeit der Capillaritats-Constanten des Alkohols von Substanz und Gestalt des benetzlen festen Korpers of the material of moistening solid and shape as a kind of method of classics by L.Wilhelmy1863, Von.Ludwig Wilhelmy, Ann. Phys., 119,177 (1863)).This method and platinum around-France (DuNouy ring) together constitute the classical way of weighing principle test fluid-gas meter surface tension or liquid-liquid interface tension force.By adopting platinum plate being replaced with the solid sample of known wetted perimeter, when surface tension of liquid value is known, the contact angle values that solid-liquid-gas three is alternate can be tested, i.e. well-known wetting balance or dynamic contact angle technology.Application platinum around-France or adopting platinum plate method test surfaces tension force, interfacial tension or contact angle device achieves commercialization, comprise Kruss, Dataphysics, KSV, Cahn, Kyowa, USA KINO, Solon (Shanghai) Information Technology Co., Ltd., upper marine morning digital technology company limited, Chengde testing machine Chang Deng company.From business-like instrument, its technical characterstic major embodiment is: (1) adopts classical sensor draw bail, and namely sensor is positioned at integrally-built top, by lower extension title be hooked together connect adopting platinum plate or platinum loop after complete test purpose; (2) capillary algorithm have employed classical algorithm, the adopting platinum plate method of the platinum around-France (DuNouy method) that C. Huh and S. G. Mason or Zuidema & Waters revises as have employed and simple force equation method ( , θ=0 when adopting platinum plate method, COS θ=1).
Patent relevant to surface tension in disclosed patent both domestic and external is very many, and the principle related to includes weight method, maximum bubble method, drop-volume method, capillary tube technique, laser method etc.Wherein, the patent of the weight method relevant to this patent is maximum, reaches nearly 30 especially at Chinese Patents.All in all situation is as follows: (1) to the improvement of test probe (as plate or ring), comprises ZL 200620131314.6 " a kind of Measurement of liquid surface tension coefficient instrument ", ZL02246571.5 " surface tension measuring hanger sheet ", ZL200910116749.1 " a kind of liquid surface tension coefficient measuring apparatus " etc., it doesn't matter and do not affect the novelty of this patent for the technology asked described in these patents and this patent, (2) to the improvement of LOAD CELLS, comprise ZL01216371 " liquid interface tension meter ", ZL01254339.X " a kind of Measurement of liquid surface tension coefficient instrument ", ZL200520039453.1 " a kind of automatic liquid interfacial tension detector ", ZL 200610054181.1 " experimental apparatus for determining surface tension coefficient of temperature-variable liquid ", ZL 200620051680.0 " a kind of Measurement of liquid surface tension coefficient instrument ", ZL 201120020899.5 " automatic interface tension test instrument " etc., its innovative point is to have employed torsion wire or improve torsion wire sensor, or introduce new sensor (as strain-ga(u)ge transducer, analytical balance) etc., do not exist conflict with the innovative structure (increasing an elevating mechanism when not changing analytical balance structure) described in this patent, thus the novelty of this patent is not affected, (3) to the innovation of the part-structures such as the control of sample cell temperature or sample stage, comprise ZL02213618.5 " sample stage for investigating surface tension of liquid ", ZL200820208896.2 " a kind of experimental provision measuring liquid surface tension coefficient ", ZL201120008560.3 " liquid surface tension coefficient measuring device for chemistry teaching " etc., because the innovative point that relates to and this patent have nothing to do, do not affect the novelty of this patent yet, (4) surface tension tests integrally-built innovation, comprise ZL 201020159905.0 " instrument of adopting platinum plate method test fluid-gas meter surface tension and liquid-liquid interface tension force ", ZL 201120065224.2 " a kind of platinum ring method liquid surface/interface tension meter ", Jap.P. JP2001099772A " surface tension test method " (the manual surface tension instrument of Japanese KYOWA) etc., the structure of these patents have employed the connection relation inconsistent with patent, does not thus also affect the novelty of this patent.
As a kind of method, adopting platinum plate method (Wilhelmy Plate method) is at " the Interfacial tensiometry " of A.I.Rusanov, " the Physical Chemistry of Surface " of Arthur.W.Adamson and " Fundamentals of Interfae and Colloid Science " Vol 3 of J.Lyklema, reasonable analysis and summary have all been carried out in the professional books such as Liquid-Fluid interfaces, relate generally to the process for treating surface (packing) of adopting platinum plate, the Perpendicular Problems of adopting platinum plate method, adopting platinum plate method angle point wetting out problems etc. improve adopting platinum plate method, promote measuring accuracy etc.But for test surfaces tension value, whether liquid level really defines a zero contact angle at the curved surface that solid (plate)-liquid-gas three-phase is formed and does not all make description; Whether revise with the buoyancy of upper part liquid level, impact is how many is not described yet; If dynamic corrections contact angle values and buoyancy value thus be also a field never related to.According to the actual fact, the contact angle values that liquid level is formed between the curved surface and plate of solid (plate)-liquid-gas three-phase formation is seldom zero degree, or may not be zero degree.As shown in Figure 1.Although under fact of case, the respective liquid that we record by optical contact angle instrument is zero degree in the contact angle values of solid surface, and due to the necessary being of this curved surface, COS θ item cannot be considered as equaling 1 by we in the formula of the force equation adopting platinum plate method of classics.Thus, in the method for testing of this patent, we have proposed a brand-new solution, dynamic corrections contact angle values and buoyancy value can be become, promote the gordian technique of adopting platinum plate method test surfaces tension force, contact angle and interfacial tension.In the method for testing implementing surface tension or interfacial tension, mainly comprise four kinds of technology at present: (1) contact method (Detachment method method), the feature of this kind of method is that namely plate stops after just having touched sample, now think that buoyancy is zero, then show that surface tension value equals by simple Mechanical Method formulae discovery ; (2) classical adopting platinum plate method (max pull), after its feature is that adopting platinum plate is immersed sample, then draw high, after obtaining maximal value, surface tension equals , from practical application, this method is static surface tension method of testing and cannot be used for test surfaces activating agent and has viscosity samples; (3) neutral buoyancy method zero-buoyancy method, the feature of this method is continue to immerse certain depth as 2mm after adopting platinum plate touches liquid level, adopting platinum plate is retracted 2mm to the much the same height of liquid level, now suppose that buoyancy is zero, contact angle is zero, surface tension equals again ; (4) immersion depth method immersion method, the feature of this method is forced by adopting platinum plate to immerse certain degree of depth as 1mm, after revising the buoyancy value of this height, calculates surface tension value by mechanics adopting platinum plate method .(reference: In situ force-balance tensiometry, G. S. Lapham, D. R. Dowling, W. Schult, Experiments in Fluids 27 (1999) 157-166, Springer-Verla, 1999).See accompanying drawing 2 adopting platinum plate method measuring technology.From as above each method, its feature be all used method be adopting platinum plate method under simple force equation condition, all suppose contact angle values be zero and all the hypothesis liquid that liquid melody bread encloses that climbs be zero to the buoyancy of adopting platinum plate.See accompanying drawing 3 adopting platinum plate method ultimate principle figure.Although 2005, Solon (Shanghai) Information Technology Co., Ltd. in the surface tension instrument A201 and A601 type of development novelty propose a kind of adopting platinum plate algorithm based on elasticity coefficient and the correction of Young-Laplace equation, but its core technology is the leverage factor that have employed simple Young-Laplace equation binding analysis balance or torsion wire sensor, simply calculate the height of liquid, but contact angle values is not comprehensively revised.This technology is inconsistent with the algorithm be combined according to liquid wetting speed, force equation and the correction of Young-Laplace formula described in this patent, so the technology of surface tension instrument A201 type or A601 type does not affect the novelty of this patent.
This patent novelty propose a brand-new connection relation, take full advantage of analytical balance original structure, achieving a tractor serves several purposes both can the surface chemistry parameter such as test surfaces tension force, interfacial tension and contact angle, can be used as analytical balance and density balance again.On testing algorithm, this patent introduces a set of calculating completely newly based on the surface tension of adopting platinum plate method principle, contact angle and interfacial tension method of testing, to solve dynamic corrections buoyancy, contact angle, promotes the object of surface tension measuring accuracy.The technology that this patent relates to can be widely used in the industry-by-industry fields such as daily use chemicals, agricultural chemicals, petrochemical complex, surfactant research, fire-fighting, electric power, has high promotional value.
Summary of the invention
This patent is for realizing as above object, and the structure of this patent surface tension proving installation composition, parts select and the various aspects such as algorithm of connection relation and adopting platinum plate method test surfaces tension force are all done well-designed.Concrete summary of the invention is as follows:
A kind of interfacial tension based on analytical balance and contact angle proving installation, comprise: jacking system, jacking system support, constant-temperature sample pool, sample stage, weighing system, described weighing system comprises adopting platinum plate, adopting platinum plate support, hook support, sample holder, analytical balance, sample stage side is fixedly mounted on the output terminal of jacking system, sample stage is provided with constant-temperature sample pool, adopting platinum plate is provided with in constant-temperature sample pool, adopting platinum plate is arranged on sample holder top by adopting platinum plate support and hook support, and sample holder bottom is arranged on analytical balance.
Described jacking system is by housing, handwheel, motor, elevating movement panel, limit switch, screw mandrel, slide block, guide track system, shaft coupling, control interface, handwheel is positioned at the top of motor and is connected with motor, motor is fixed on housing, the output terminal of motor is connected with screw mandrel by shaft coupling, screw mandrel is provided with slide block, the both sides of slide block are provided with guide track system, and the top of screw mandrel and low side are respectively arranged with a limit switch.
The sample holder of described weighing system is designed to C shape, is fixed in the pallet hole of analytical balance, is hung with adopting platinum plate below hook support bottom the sample holder of C shape.
Also comprise LOAD CELLS and single-chip microcomputer, LOAD CELLS is arranged on below or the rear of sample stage, and LOAD CELLS is electrically connected with single-chip microcomputer.
Based on the interfacial tension of analytical balance and the interfacial tension of contact angle proving installation and contact angle testing algorithm, this algorithm adopts a set of standing type adopting platinum plate method combined in conjunction with liquid wetting speed, adopting platinum plate Mechanical Method, Young-Laplace equation to test, and the steps include:
One, adopting platinum plate is searched and is in static condition after touching fluid sample, and its notable feature is stop lifting after adopting platinum plate one touches liquid level immediately;
Two, based on adopting platinum plate method principle time, make use of liquid wetting speed formula, adopting platinum plate Mechanical Method formula, Young-Laplace equation three equations in computing formula, and simultaneous solution, obtain surface tension, moistening height and contact angle values, have employed the mode of theoretical curve and actual curve least square approximation when computing method.
The adopting platinum plate method computing formula of this simplify of arithmetic, have employed the unit conversion expression of 1mN/m=0.048544mg/m or 1mN/m=0.049456mg as gauging surface tension force.
5, a set of a set of system of equations solving adopting platinum plate method principle of standing type adopting platinum plate method method of testing proposition combined in conjunction with liquid wetting speed, adopting platinum plate Mechanical Method, Young-Laplace equation is designed:
Wherein: as above formula (1) is adopting platinum plate method Young-Laplace formula.W is adopting platinum plate length, and d is adopting platinum plate thickness, and Δ ρ is that fluid density is poor, σ is surface tension value, θ is contact angle values, and x is the length of liquid level curved surface, y and h is the height of liquid level curved surface, t is the time, mass is the weight that analytical balance claims, and h is the climb altitude of liquid level, and g is gravity system, V is wetting speed, and η is sample viscosity.
6, propose a set ofly equation as above described in 5 to be carried out the simplification Conversion of measurement unit formula after empirical solving:
(1) be 23.6-23.85mm for plate length, thickness 0.15-0.18mm, girth is the adopting platinum plate of about 48mm, and be between 0.6-1.4 in fluid density difference, when viscosity is less than 500CP.S, its reduced mechanical model is: 1mN/m=0.048544mg/m;
(2) be 24-24.232mm for plate length, thickness is 0.156-0.18mm, and girth is the adopting platinum plate of about 48.8mm, is between 0.6-1.4 in fluid density difference, and when viscosity is less than 500CP.S, its computing formula simplified is: 1mN/m=0.049456mg.
7, a method utilizing Long Gekula (Runge-Kutta) or position, Europe (Euler) method to solve the discrete Young-Laplace system of equations as above proposed in 6 is proposed, and utilize the mode analyzed and draw, show each coordinate points (x on corresponding theoretical curve and curve i, y i), calculate corresponding height value h and contact angle values θ and surface tension value σ.
Advantage of the present invention is: this patent novelty propose a brand-new connection relation, take full advantage of analytical balance original structure, achieving a tractor serves several purposes both can the surface chemistry parameter such as test surfaces tension force, interfacial tension and contact angle, can be used as analytical balance and density balance again.On testing algorithm, this patent introduces a set of calculating completely newly based on the surface tension of adopting platinum plate method principle, contact angle and interfacial tension method of testing, to solve dynamic corrections buoyancy, contact angle, promotes the object of surface tension measuring accuracy.
Accompanying drawing explanation
Fig. 1: contact angle situation during different surfaces/interfacial tension value;
Fig. 2: adopting platinum plate method measuring technology schematic diagram;
Fig. 3: adopting platinum plate method ultimate principle figure;
Fig. 4: the interfacial tension described in this patent and contact angle proving installation structural drawing;
Fig. 5: jacking system structural drawing in the interfacial tension described in this patent and contact angle proving installation;
Fig. 6: adopting platinum plate liquid film fit solution under different surfaces tension.
Embodiment
In order to realize after namely a tractor serves several purposes mentioned by this patent realize test surfaces tension force and contact angle object by the structure improving analytical balance, equally, this device still may be used for weighing function and the density analysis sky equality function of analytical balance; And realizing the object of dynamic corrections contact angle and buoyancy value, this patent has all carried out total innovation for aspects such as the structure in device and connection relation, testing algorithms.Embodiment is as follows:
1, select business-like analytical balance as the sensor of test surfaces tension force, interfacial tension and contact angle, concrete implementation detail comprises: the rear panel glass (Sai Duolisi, plum Teller and permanent equality analytical balance) of analytical balance takes off and is replaced with innovative design jacking system by (1), and is fixed on analytical balance pedestal; (2) rear panel is had to the analytical balance (as plum Teller balance or other brand balances domestic) of wiring board, then by after taking off elevating movement panel, the structure of elevating movement panel and housing can be utilized, fixed riser system.(3) utilize analytical balance existing pan of a steelyard structure (above putting pan of a steelyard structure or rearmounted title pan of a steelyard structure), existing pan of a steelyard is taken off and installs a C shape sample stage 7.By the connected mode not using the lower scale hook of analytical balance or sensor as above, realize the structure of a novelty.
2, design a set of include handwheel 1-1, motor 1-2, elevating movement panel 1-3, limit switch 1-4, screw mandrel 1-5, shaft coupling 1-6, control interface 1-7, guide track system optical table as jacking system.By controlling the motion of motor or manually turning handwheel (in manual system), realize moving up and down of sample stage.Handwheel is positioned at the top of motor and is connected with motor, re-uses shaft coupling and be connected with screw mandrel after on the housing that motor is fixed to sample stage by motor cabinet (sign); Guide track system; Elevating movement panel is fixed on screw mandrel by feed screw nut.
3, a set of sample stage lifting structure including jacking system 1, jacking system support 2, sample stage 3, constant-temperature sample pool composition 4 is designed.Embodiment is as follows: be fixed to after on jacking system support by the optical translation platform as above described in 2, is connected with the rear panel changed a social system or elevating movement panel, thus the object that realization is fixed on analytical balance support; Be connected with jacking system with sample stage load onto a constant-temperature sample pool on sample stage after.By the lifting of motor or Non-follow control sample stage, realize the lifting of sample stage; Place sample in sample cell after, when keeping adopting platinum plate invariant position, use fluid to be measured to touch adopting platinum plate by rising sample stage, then by the surface tension method of testing that this patent is mentioned, calculate contact angle values and corresponding surface tension value.
4, a set of adopting platinum plate 5, hook support 4, sample holder 6, sample stage 7, analytical balance 8 of including is designed at interior adopting platinum plate method weighing system.Embodiment is as follows: (1) sample holder is designed to C shape, and its object, for after getting around hoistable platform, forms a support to hang up adopting platinum plate above hoistable platform.(2) C shape sample holder is fixed to (upper tray is top, and rear tray analytical balance is rear) in the pallet hole of analytical balance; (3) above sample holder, put into a hook support; (4) adopting platinum plate hangs over below adopting platinum plate hook support.By the sample holder that the C shape of particular design as mentioned above is such, the link position forming LOAD CELLS and sample holder is below sample stage or rear, adopting platinum plate hitch point is above sample stage, sample stage is positioned at the special construction relation of sample holder C shape arc, and then provides required structure for realizing test surfaces tension force object.
5, the implementation of test surfaces tension force, interfacial tension: after tested liquid (one or both liquid) is placed into constant-temperature sample pool, adopting platinum plate is hung on sample holder, and the air (surface tension) stayed in above lower floor's liquid or supernatant liquid interior (interfacial tension), control motor or hand turn jacking system, rise sample stage, reach threshold values with no by the title value change of analytical balance, judge whether to find liquid level.Once find liquid level, namely stop rising sample stage.After completing the dynamic surface tension of a period of time or interfacial tension test, control motor decline sample stage or manual dynamic jacking system, decline sample stage, until adopting platinum plate leaves lower floor's liquid.
6, test the implementation of contact angle: by adopting as above mode described in 5, first test draws the surface tension value of respective liquid.Use fixture to be fixed to after below sample holder tested solid again, rise sample stage, once after touching liquid, stop lifting immediately.Motion capture liquid is in the process of climbing of solid sample and speed (weight-time).
7, analytical balance is as the implementation of function of weighing and density balance function: take off constant-temperature sample pool and sample stage, take off sample holder, filled the original pallet of analytical balance, can complete the transformation from surface tension test function to function of weighing; By taking off adopting platinum plate support, hanging up density balance pallet (accessory of analytical balance genuine), the functional realiey of density balance can be completed fast.
8, adopting platinum plate method principle test surfaces tension force dynamic corrections contact angle and the liquid bent curved surface implementation of surrounding the buoyancy correction of liquid is as follows:
Design a set of a set of system of equations solving adopting platinum plate method principle of standing type adopting platinum plate method method of testing proposition combined in conjunction with liquid wetting speed, adopting platinum plate Mechanical Method, Young-Laplace equation:
Mechanical equation (In situ force-balance tensiometry, G. S. Lapham, D. R. Dowling, W. Schult, Experiments in Fluids 27 (1999), 157-166, Springer-Verla, 1999) (5)
Young-Laplace equation (Applied surface thermodynamics, A.W.Neumann, the 414th page) (6)
(the reference of wetting speed equation, D. Bonn, J. Eggers, J. Indekeu, J. Meunier, E. Rolley, Wetting and spreading, Rev.Mod. Phys. 81 (2009) 739 – 805., and O.V. Voinov, Hydrodynamics of wetting, Fluid Dyn. 11 (1976) 714 – 721.)
Wherein: as above formula (1) is adopting platinum plate method Young-Laplace formula.W is adopting platinum plate length, and d is adopting platinum plate thickness, and Δ ρ is that fluid density is poor, σ is surface tension value, and θ is contact angle values, and x is the length of liquid level curved surface, y and h is the height of liquid level curved surface, t is the time, and m is the weight of adopting platinum plate itself, and mass is the weight that analytical balance claims, h is the climb altitude of liquid level, g is gravity system, and V is wetting speed, and η is sample viscosity.
9, solve as above system of equations described in 7, and analysis show that the embodiment of surface tension or interfacial tension value is as follows:
(1) form the state that adopting platinum plate is statically placed in liquid levels, embodiment comprises: rise sample stage, and fluid to be measured is simultaneously raised.Adopting platinum plate method is kept to leave standstill motionless; Search liquid levels, embodiment is as follows, by arranging corresponding threshold values or 0.1mg, after corresponding weight change being read by analytical balance, namely thinking and having found liquid level; Once after finding liquid level, namely sample stage stops rising, and allows adopting platinum plate remain to the position of sample near sample liquid level.
(2) namely can climb on adopting platinum plate surface after liquid one touches adopting platinum plate, the corresponding climbing speed of software dynamically recording, and adopt simultaneous formula 2,3,6, use Long Gekula (Runge-Kutta) or Euler method (Euler) method method for solving, matching obtains reality (x, y) curve, is depicted as curve.As shown in Figure 6.After liquid climbs and reaches maximum climbing speed, namely corresponding dynamometry value can remain unchanged.If tested liquid is surfactant or has viscosity samples, after reaching maximal value, curve still has variation.When applying, get the change curve of wherein a period of time as velocity amplitude.
(3) Simultaneous Equations 1,4,5 adopt Long Gekula (Runge-Kutta) or Euler method (Euler) method solving equation group, and will solve and draw, when for arbitrary surfaces tension value, contact angle values and height, utilize the mode that software is drawn, show each coordinate points (xi on corresponding theoretical curve and curve, yi), corresponding height value h and contact angle values θ is calculated.
(4) will as above the actual speed curve of (2) and the theoretical velocity curve as above described in (3) adopts least square fitting, can draw accordingly highly and contact angle values.Meanwhile, the buoyancy calculations that liquid level curved surface surrounds liquid is completed.
(5) in dynamic surface tension test process, the density due to system can be considered almost constant, and corresponding contact angle variation range is very little, and for convenience's sake, the contact angle values adopting initial calculation to draw participates in final calculating.
10, propose a set ofly equation as above described in 5 to be carried out the simplification Conversion of measurement unit formula after empirical solving:
(1) be 23.6-23.85mm for plate length, thickness 0.15-0.18mm, girth is the adopting platinum plate of about 48mm, and be between 0.6-1.4 in fluid density difference, when viscosity is less than 500CP.S, its reduced mechanical model is: 1mN/m=0.048544mg/m;
(2) be 24-24.232mm for plate length, thickness is 0.156-0.18mm, and girth is the adopting platinum plate of about 48.8mm, is between 0.6-1.4 in fluid density difference, and when viscosity is less than 500CP.S, its computing formula simplified is: 1mN/m=0.049456mg.
Concrete equation simplification mode is as follows:
(1), by some liquid of test known surface tension force, after comprising the wetting speed of redistilled water, alcohol, ethylene glycol, benzene, surface tension value input formula 6, adopt Long Geku daraf(reciprocal of farad), solve and draw corresponding contact angle values and height value.The contact angle values that different surface tension value correspondence is drawn and corresponding height value adopt polynomial curve to carry out optimization matching respectively again, thus the most optimized parameter of the contact angle finally obtained under an all measured value condition of relative adaptation and height value.
(2) the optimization height as above described in (1) and contact angle data are input in formula 3, surface tension value are weighed value as 100mg input formula 3, just can obtain the formula of reduction of the adopting platinum plate of one group of corresponding length and width accordingly.
Experiment proves, by one of the proposition of this patent novelty brand-new connection relation, take full advantage of analytical balance original structure, achieving a tractor serves several purposes both can the surface chemistry parameter such as test surfaces tension force, interfacial tension and contact angle, can be used as analytical balance and density balance again.On testing algorithm, this patent introduces a set of calculating completely newly based on the surface tension of adopting platinum plate method principle, contact angle and interfacial tension method of testing, solves dynamic corrections buoyancy, contact angle, promotes the object of surface tension measuring accuracy.The technology that this patent relates to can be widely used in the industry-by-industry fields such as daily use chemicals, agricultural chemicals, petrochemical complex, surfactant research, fire-fighting, electric power, has high promotional value.

Claims (6)

1. the interfacial tension based on analytical balance and contact angle proving installation, it is characterized in that, comprise: jacking system, jacking system support, constant-temperature sample pool, sample stage, weighing system, described weighing system comprises adopting platinum plate, adopting platinum plate support, hook support, sample holder, analytical balance, sample stage side is fixedly mounted on the output terminal of jacking system, sample stage is provided with constant-temperature sample pool, adopting platinum plate is provided with in constant-temperature sample pool, adopting platinum plate is arranged on sample holder top by adopting platinum plate support and hook support, sample holder bottom is arranged on analytical balance.
2. the interfacial tension based on analytical balance according to claim 1 and contact angle proving installation, it is characterized in that, described jacking system is by housing, handwheel, motor, elevating movement panel, limit switch, screw mandrel, slide block, guide track system, shaft coupling, control interface, handwheel is positioned at the top of motor and is connected with motor, motor is fixed on housing, the output terminal of motor is connected with screw mandrel by shaft coupling, screw mandrel is provided with slide block, the both sides of slide block are provided with guide track system, and the top of screw mandrel and low side are respectively arranged with a limit switch.
3. the interfacial tension based on analytical balance according to claim 1 and contact angle proving installation, it is characterized in that, the sample holder of described weighing system is designed to C shape, is fixed in the pallet hole of analytical balance, is hung with adopting platinum plate below hook support bottom the sample holder of C shape.
4. the interfacial tension based on analytical balance according to claim 1 and contact angle proving installation, is characterized in that, also comprise LOAD CELLS and single-chip microcomputer, and LOAD CELLS is arranged on below or the rear of sample stage, and LOAD CELLS is electrically connected with single-chip microcomputer.
5., according to claim 1 based on the interfacial tension of analytical balance and the interfacial tension of contact angle proving installation and contact angle testing algorithm, it is characterized in that, comprise the following steps:
One, form the state that adopting platinum plate is statically placed in liquid levels, rise sample stage, fluid to be measured is simultaneously raised, keeps adopting platinum plate method to leave standstill motionless; Search liquid levels, embodiment is as follows, by arranging corresponding threshold values or 0.1mg, after corresponding weight change being read by analytical balance, namely thinking and having found liquid level; Once after finding liquid level, namely sample stage stops rising, and allows adopting platinum plate remain to the position of sample near sample liquid level;
Two, design formula:
Wherein: as above formula (1) is adopting platinum plate method Young-Laplace formula; W is adopting platinum plate length, and d is adopting platinum plate thickness, and Δ ρ is that fluid density is poor, σ is surface tension value, θ is contact angle values, and x is the length of liquid level curved surface, y and h is the height of liquid level curved surface, t is the time, mass is the weight that analytical balance claims, and h is the climb altitude of liquid level, and g is gravity system, V is wetting speed, and η is sample viscosity; Namely can climb on adopting platinum plate surface after liquid one touches adopting platinum plate, the corresponding climbing speed of software dynamically recording, and adopt simultaneous formula 2; 3,6, use Long Gekula or Euler method method method for solving; matching obtains reality (x, y) curve, is depicted as curve; After liquid climbs and reaches maximum climbing speed, namely corresponding dynamometry value can remain unchanged, if tested liquid is surfactant or has viscosity samples, after reaching maximal value, curve still has variation; When applying, get the change curve of wherein a period of time as velocity amplitude;
Three, Simultaneous Equations 1,4,5 adopt Long Gekula or Euler method method solving equation group, and will solve and draw, when for arbitrary surfaces tension value, contact angle values and height, utilize the mode analyzed and draw, show each coordinate points (xi on corresponding theoretical curve and curve, yi), corresponding height value h and contact angle values θ is calculated;
Four, the as above actual speed curve of step 2 and the theoretical velocity curve as above described in step 3 are adopted least square fitting, can draw accordingly highly and contact angle values; Meanwhile, the buoyancy calculations that liquid level curved surface surrounds liquid is completed;
Five, in dynamic surface tension test process, the density due to system can be considered almost constant, and corresponding contact angle variation range is very little, and for convenience's sake, the contact angle values adopting initial calculation to draw participates in final calculating.
6. according to claim 5 based on the interfacial tension of analytical balance and the interfacial tension of contact angle proving installation and contact angle testing algorithm, it is characterized in that, the adopting platinum plate method computing formula of this simplify of arithmetic, have employed the unit conversion expression of 1mN/m=0.048544mg/m or 1mN/m=0.049456mg as gauging surface tension force.
CN201410722554.2A 2014-12-04 2014-12-04 Interface tension and contact angle test device and method based on analytical balance Pending CN104406892A (en)

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CN104880387A (en) * 2015-06-17 2015-09-02 成都理工大学 Test device for measuring contact angle of water repellency soil
CN105606493A (en) * 2015-12-18 2016-05-25 中国矿业大学 Device and method for rapid testing of degree of wetting of dustfall agent
CN106483044A (en) * 2016-09-30 2017-03-08 北京金风科创风电设备有限公司 Pole piece, fibre reinforced materials and its assay device, control method
CN106596348A (en) * 2016-12-23 2017-04-26 中国海洋石油总公司 Testing method for rock surface static contact angle and rock surface wettability dynamic change testing method utilizing testing method for rock surface static contact angle
CN106644806A (en) * 2016-12-14 2017-05-10 合肥国轩高科动力能源有限公司 Test device and test method for liquid absorption rate of lithium ion battery diaphragm
CN109682723A (en) * 2018-11-09 2019-04-26 中国农业大学 A kind of fast appraisement method of agricultural chemicals formula
CN110954443A (en) * 2019-12-09 2020-04-03 武汉理工大学 Method for calculating dynamic contact angle of asphalt material by using plate inserting method

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Publication number Priority date Publication date Assignee Title
CN104880387A (en) * 2015-06-17 2015-09-02 成都理工大学 Test device for measuring contact angle of water repellency soil
CN104880387B (en) * 2015-06-17 2018-02-27 成都理工大学 One kind measures repellency soil contact angle experimental rig
CN105606493A (en) * 2015-12-18 2016-05-25 中国矿业大学 Device and method for rapid testing of degree of wetting of dustfall agent
CN105606493B (en) * 2015-12-18 2018-08-07 中国矿业大学 A kind of apparatus and method of quick test dustfall agent degree of wetting
CN106483044A (en) * 2016-09-30 2017-03-08 北京金风科创风电设备有限公司 Pole piece, fibre reinforced materials and its assay device, control method
CN106644806A (en) * 2016-12-14 2017-05-10 合肥国轩高科动力能源有限公司 Test device and test method for liquid absorption rate of lithium ion battery diaphragm
CN106596348A (en) * 2016-12-23 2017-04-26 中国海洋石油总公司 Testing method for rock surface static contact angle and rock surface wettability dynamic change testing method utilizing testing method for rock surface static contact angle
CN106596348B (en) * 2016-12-23 2018-12-07 中国海洋石油集团有限公司 Rock surface static contact angle and its wetability dynamic change test method
CN109682723A (en) * 2018-11-09 2019-04-26 中国农业大学 A kind of fast appraisement method of agricultural chemicals formula
CN109682723B (en) * 2018-11-09 2020-09-15 中国农业大学 Rapid evaluation method of agricultural chemical formula
CN110954443A (en) * 2019-12-09 2020-04-03 武汉理工大学 Method for calculating dynamic contact angle of asphalt material by using plate inserting method

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