CN1382971A - Measurer of expansion viscosity and elasticity for interface or surface - Google Patents
Measurer of expansion viscosity and elasticity for interface or surface Download PDFInfo
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- CN1382971A CN1382971A CN 01115539 CN01115539A CN1382971A CN 1382971 A CN1382971 A CN 1382971A CN 01115539 CN01115539 CN 01115539 CN 01115539 A CN01115539 A CN 01115539A CN 1382971 A CN1382971 A CN 1382971A
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Abstract
The invention relates to the device for measuring the expansive visco elasticity on interface or surface by using Langmuir channel process. The device includes Langmuir trough solid, the slide block and the part for measuring the interfacial tension. The temperature sensor is located on the trough solid with notching style inside. The slide block is connected to the screw with the reversed screw thread. The temperature sensor, the force sensor and the stepper motor are connected the interface of the data line through the interface board. The force sensor is fixed on the bracket of the force sensor positioned above the trough solid. The slung piece is hung on the pothook located on the arm of force of the force sensor. The invented device provides three working modes of tool for measuring the expansive visco elasticity on interface.
Description
The invention belongs to the viscoelasticity measurement Instrument technology field, particularly the interface of Lang Miuer (Langmuir) channel process or surface spreading determination of viscoelasticity instrument.
Interface or surface spreading viscoelasticity are the critical natures on emulsion fluid water-oil interface or surface, and measuring method can be divided into Langmuir channel process and liquid drip expansion technology two big classes.It is similar to the normal film balance that the Langmuir channel process is measured the used Langmuir groove of the experimental provision of interface expansion viscosity and elasticity, the compression at interface or expansion are obtained by the motion of sliding barrier, according to the difference of sliding barrier mode of motion, the method that this class utilizes the Langmuir groove to measure the interface expansion viscosity and elasticity can be divided into three kinds of small size low-frequency oscillation method, macroscopic deformation method and interface or surface tension relaxation methods again.These three kinds of methods respectively have its relative merits, are applicable to different measurement systems.Though prepared corresponding surveying instrument according to different measuring methods, because these surveying instruments all are a certain measuring methods of taking separately wherein, so measuring method has been subjected to bigger restriction.
The interface or the surface spreading determination of viscoelasticity instrument of existing Langmuir channel process, have following defective: (1) is because the restriction of Mechanical Driven mode, sliding barrier motion can only be taked a kind of in uniform motion mode or the three kinds of mode of motion above-mentioned in the existing technology, measuring method is more single, be difficult to the experimental data that obtains enriching, this has brought bigger restriction for scope of application of instrument.(2) because the design of Langmuir groove and sliding barrier, existing technology or only be applicable to the viscoelastic measurement of surface spreading, otherwise bigger to the disturbance at interface when measuring the interface expansion viscosity and elasticity, may bring adverse influence to measurement.
The objective of the invention is to overcome the interface of existing Lang Miuer (Langmuir) channel process or the above-mentioned defective that surface spreading determination of viscoelasticity instrument exists, provide a kind of and can use small size low-frequency oscillation method, macroscopic deformation method and interface or three kinds of measuring methods of surface tension relaxation method, interface or surface spreading determination of viscoelasticity instrument to interface or surface spreading viscoelasticity are measured can provide more comprehensive interface or surface spreading viscoelasticity experimental data by this analyzer.
The object of the present invention is achieved like this:
Interface of the present invention or surface spreading determination of viscoelasticity instrument comprise Lang Miuer (Langmuir) cell body, sliding barrier and the mechanical control section of sliding barrier motion, measure portion and the constant temperature water bath and the temp measuring system of interfacial tension;
On the cell body of Langmuir groove 1, be provided with water inlet 15, water delivering orifice 16 and temperature sensor 8; Sliding barrier 2 is installed in the inside of Langmuir groove 1; Sliding barrier 2 is connected with the screw rod 6 with reverse thread, and screw rod 6 is connected with stepper motor 7;
Temperature sensor 8, force transducer 4 and stepper motor 7 link to each other with data line interface 9 and power lead 17 by interface board 18;
The data line 11 that data line interface 9 is drawn is connected with circuit control section 19 with power lead 17, and the data line interface 12 on the circuit control section 19 is connected with the com port 14 of computing machine by data line 13.
Langmuir groove 1 links to each other with Water Tank with Temp.-controlled with water delivering orifice 16 by water inlet 15, comes constant temperature with this.The temperature of Langmuir cell body 1 is measured by temperature sensor 8.
Described interface board 18 is to be connected with the data line 11 of 25 pins.
The inside of described Langmuir cell body 1 is stepped structure.
The course of work of whole instrument (comprising the motion of sliding barrier, data acquisition and data processing) adopts computer controlled automatic.Instrument is made up of mechanical part and circuit control section, computing machine and software section.The effect of computing machine and software section is to send instruction and analyze experimental data; The effect of circuit control section is that computer instruction is transformed into concrete electric signal, the electric signal that measures is transformed into digital data transmission gives computing machine, provides the mechanical part operate as normal required voltage simultaneously; Mechanical part then is the concrete implementer that interface deformation and interfacial tension are measured.
Stepped structure is adopted in the inside of described Langmuir cell body 1, and its advantage is that the position of water-oil interface is easy to obtain.
Described sliding barrier 2, of its drive link 2-a links to each other with screw rod 6, and dead slot is dug out in the other end, 2-b entangles with slide block, the consistency of thickness of the width of dead slot and slide block 2-b, the effect of gib screw 2-c are that frame lives in drive link 2-a, make it very flexible with contacting of slide block 2-b.Since slide block 2-b be gravity pressure by drive link 2-a and it self on Langmuir groove 1, therefore both can ensure that slide block 2-b contacted with the good of cell body 1, make the slip friction force of getting up less.
The first half of described slide block 2-b is the teflon piece of one and a half months shape, and the stainless steel substrates that the latter half has been plated one deck teflon by the outside is made, and stainless steel substrates is fixed on the teflon piece of the first half with screw.
The described sheet that hangs is made with thick ptfe sheet of 0.8mm or the stainless steel substrates that plated the condition of equivalent thickness of one deck teflon.Be suspended on stainless steel wire or nickel filament on the hook of force transducer.
The motion of described sliding barrier is controlled with stepper motor driven screw rod with reverse thread, by the motion step number of computer-controlled stepper motor in the unit interval, thereby obtain to have the mode of motion (as motion of sinusoidal motion, indicial equation or the like) of different motion equation.
Interface of the present invention or surface spreading determination of viscoelasticity instrument have:
1. the instrument of interface or surface spreading viscoelasticity measurement is provided;
2. can adopt three kinds of mode of operations to carry out work, abundant experimental data can be provided, be suitable for the measurement of different systems.
3. the stepped designs of cell body inside is more suitable for the measurement in water-oil interface.
4. adopt the stainless steel substrates of teflon plate or plating teflon to hang sheet, make the contact angle that hangs sheet and water-oil interface can remain on 180 ° for a long time, make the measurement of dynamic interface tension force convenient accurately.
5. adopt the sliding barrier of particular design, make to slide to keep good the slip between barrier and the cell body, and it is very little to the disturbance of liquid bulk phase to slide barrier.
Below in conjunction with embodiment and accompanying drawing technical scheme of the present invention is further described.
Fig. 1. apparatus structure synoptic diagram of the present invention;
Fig. 2. the vertical view of Langmuir groove of the present invention;
Fig. 3. the longitudinal profile synoptic diagram of Langmuir groove of the present invention;
Fig. 4. the structural representation after the sliding barrier combination of the present invention;
Fig. 5. the side structure synoptic diagram of slide block of the present invention;
Fig. 6. the schematic top plan view of drive link of the present invention;
Fig. 7. the stable state surface spreading viscosity experiment data and curves of Triton X-100 (concentration 0.05%) during the different spreading rate constant of the embodiment of the invention 1;
Fig. 8. the empirical curve and the matched curve of n-decane/0.05% Triton X-100 aqueous solution interface under the embodiment of the invention 2 small size low-frequency oscillation mode of operations;
Fig. 9. the interfacial tension relaxation curve and the matched curve of n-decane/0.1% Triton X-100 aqueous solution interface under the embodiment of the invention 3 interfacial tension relaxation mode of operations;
Figure 10. the interface dilatational elasticity (ε that the embodiment of the invention 3 interfacial tension relaxation methods obtain
d) and interface expansion viscosity (η
d) frequency spectrum.
Indicate among the figure:
1.Langmuir groove 2. sliding barriers 3. hang sheet 4. force transducers 5. force transducer supports
6. screw rod 7. stepper motors 8. temperature sensors of reverse thread
9. 25 pin data line interfaces, 10. mechanical part shells, 11. 25 pin data lines
12. 9 pin data line interfaces, 13. 9 pin data lines, 14. computing machine com ports
15. water inlet 16. water delivering orifices 17. power leads 18. interface boards 19. circuit control sections
2-a. drive link 2-b. slide block 2-c. gib screw.
Embodiment 1.
Interface of the present invention or surface spreading determination of viscoelasticity instrument are made up of mechanical part and circuit control section, computing machine and software section.The effect of computing machine and software section is to send instruction and analyze experimental data; The effect of circuit control section is that computer instruction is transformed into concrete electric signal, the electric signal that measures is transformed into digital data transmission gives computing machine, provides the mechanical part operate as normal required voltage simultaneously; Mechanical part then is the concrete implementer that interface deformation and interfacial tension are measured, and the mechanical part of instrument is placed in the shell 19.
On the Langmuir groove 1 of inside employing stepped construction, be provided with water inlet 15, water delivering orifice 16 and temperature sensor 8; Water inlet 15 links to each other with water inlet with the water delivering orifice of Water Tank with Temp.-controlled respectively with water delivering orifice 16, reaches the purpose of constant temperature with this.Temperature sensor 8 is used to measure the temperature of Langmuir groove 1.
In the inside of Langmuir groove 1 sliding barrier 2 is installed, sliding barrier 2 is made up of drive link 2-a, slide block 2-b and the gib screw 2-c of frame under drive link 2-a of control slide block movement.The drive link 2-a of sliding barrier 2 is connected on the screw rod 6 with reverse thread, and screw rod 6 directly links to each other with stepper motor 7, controls the motion of sliding barrier 2 by the rotation of stepper motor.
Temperature sensor 8, force transducer 4 and stepper motor 7 link to each other with data line interface 9 and power lead 17 by interface board 18.Force transducer 4 is fixed on the force transducer support 5 of Langmuir cell body top, hangs sheet 3 and is suspended on the hook on force transducer 4 arm of forces; The horizontal level that hangs sheet is the center that is positioned at the Langmuir groove, is parallel to the direction of slide block 2-b, and height is as the criterion with the position at oil/water or air/water interface.Hang sheet with the thick ptfe sheet of 0.8mm, be suspended on stainless steel wire or nickel filament on the hook of force transducer.
Data line 11 and power lead 17 that data line interface 9 is drawn are connected to circuit control section 19, and circuit control section 19 is connected with the com port 14 of computing machine by data line 13.
One of the drive link 2-a of sliding barrier 2 links to each other with screw rod 6, and dead slot is dug out in the other end, and 2-b entangles with slide block, the consistency of thickness of the width of dead slot and slide block 2-b, and the effect of gib screw 2-c is that frame lives in drive link 2-a, makes it very flexible with contacting of slide block 2-b.The first half of slide block 2-b is the teflon piece of one and a half months shape, and the stainless steel substrates that the latter half has been plated one deck teflon by the outside is made, and stainless steel substrates is fixed on the teflon piece of the first half with screw.
The motion of sliding barrier is controlled with stepper motor driven screw rod with reverse thread, by the motion step number of computer-controlled stepper motor in the unit interval, thereby obtain to have the mode of motion (as motion of sinusoidal motion, indicial equation or the like) of different motion equation.
The course of work of whole instrument (comprising the motion of sliding barrier, data acquisition and data processing) adopts computer controlled automatic.
At first soak inwall, the slide block 2-b of Langmuir groove 1 and hang sheet 3,, clean drying with first water and redistilled water respectively then to remove the organic impurities that may exist with chromic acid lotion.Be adjusted to suitable position with sliding barrier 2 and hanging sheet 3, the Langmuir groove is adjusted to level.Inject water, the liquid level of water is concordant with the bench height of Langmuir groove 1.If carry out the measurement of surface nature, then directly carry out following operation, if carry out the measurement of interfacial property, also to inject oil phase, the liquid level of oil phase hangs sheet 3 with complete submergence and is as the criterion.With water bath with thermostatic control experimental system is carried out temperature control.
Treat system pre-equilibration long enough after the time, the measurement of beginning interface or surface spreading viscoelastic property.Method is as follows; Open computing machine and instrument power source, instrument preheating 30 minutes.Open control program, computing machine and instrument is online, after the online success, select mode of operation, the input controlled variable is pressed record button, can begin experiment measuring.After measuring end, again the raw data that obtains can be obtained corresponding measurement result with software processes.
1. steady state method is measured the stable state surface spreading viscosity of 0.1% Triton X-100 aqueous solution.
Measurement result as shown in Figure 7.Δ σ value in the time of can reading different spreading rate constant from figure, substitution formula can get stable state expansion viscosity, and the result is as shown in the table.
| dlnA/dt(s -1) | 0.0121 | ?9.06 *10 -3 | ?6.04 *10 -3 | ?4.53 *10 -3 | ?3.62 *10 -3 |
| ?Δσ(mN/m) | 1.10 | ?1.17 | ?1.15 | ?0.92 | ?0.63 |
| ?K(mN/ms) | 90.9 | ?129.1 | ?190.4 | ?203.0 | ?173.8 |
2. measure the expansion viscosity and elasticity of n-decane/Triton X-100 aqueous solution interface under the small size low-frequency oscillation mode of operation
Measuring condition: temperature: 20 ℃
Oscillation amplitude: 10%
Oscillation frequency: 0.05Hz
Experiment primary curve and matched curve are as shown in Figure 8.
From figure, read: Δ σ
Balance=0.20mN/m.Calculate and can obtain according to formula, under this experiment condition, | ε |=1.88mN/m.Can obtain phase angle theta=36 ° by the sinusoidal curve data fitting.Can calculate ε respectively by formula
d=1.52mN/m, η
d=22.1mN/ms.
3. the expansion viscosity and elasticity interfacial tension relaxation curve of interfacial tension relaxation method measurement decane/0.1% Triton X-100 aqueous solution interface and matched curve are as shown in Figure 9.The interface dilatational elasticity ε that utilizes formula to obtain
dWith interface expansion viscosities il
dFrequency spectrum respectively as shown in figure 10.
Claims (8)
1. interface or surface spreading determination of viscoelasticity instrument comprise youth Miu Er cell body, sliding barrier and the mechanical control section of sliding barrier motion, measure portion and the constant temperature water bath and the temp measuring system of interfacial tension, it is characterized in that:
On the cell body of youth Miu Er groove (1), be provided with water inlet (15), water delivering orifice (16) and temperature sensor (8); Sliding barrier (2) is installed in the inside of youth Miu Er groove (1); Sliding barrier (2) is connected with the screw rod with reverse thread (6), and screw rod (6) is connected with stepper motor (7);
Temperature sensor (8), force transducer (4) and stepper motor (7) link to each other with data line interface (9) and power lead (17) by interface board (18).
2. interface as claimed in claim 1 or surface spreading determination of viscoelasticity instrument, it is characterized in that: the data line (12) that described data line interface (9) is drawn is connected with circuit control section (19) with power lead (17), and the data line interface (12) on the circuit control section (19) is connected with the com port (14) of computing machine by data line (13).
3. interface as claimed in claim 1 or surface spreading determination of viscoelasticity instrument is characterized in that: described force transducer (4) is fixed on the force transducer support (5) of youth Miu Er cell body top, hangs sheet (3) and is suspended on the hook on force transducer (4) arm of force.
4. interface as claimed in claim 1 or surface spreading determination of viscoelasticity instrument is characterized in that: described sliding barrier (2) is made up of drive link (2-a), slide block (2-b) and the frame gib screw (2-c) under drive link (2-a) of control slide block movement.
5. interface as claimed in claim 1 or surface spreading determination of viscoelasticity instrument is characterized in that: the inside of described youth Miu Er cell body (1) is stepped structure.
6. as claim 1 or 4 described interfaces or surface spreading determination of viscoelasticity instrument, it is characterized in that: described sliding barrier (2), of its drive link (2-a) links to each other with screw rod (6), and dead slot is dug out in the other end, (2-b) entangles with slide block, the consistency of thickness of the width of dead slot and slide block (2-b).
7. interface as claimed in claim 4 or surface spreading determination of viscoelasticity instrument is characterized in that: the first half of described slide block (2-b) is the teflon piece of one and a half months shape, and the stainless steel substrates that the latter half has been plated one deck teflon by the outside is made.
8. interface as claimed in claim 3 or surface spreading determination of viscoelasticity instrument is characterized in that: the described sheet that hangs is made with thick ptfe sheet of 0.8mm or the stainless steel substrates that plated the condition of equivalent thickness of one deck teflon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01115539 CN1382971A (en) | 2001-04-27 | 2001-04-27 | Measurer of expansion viscosity and elasticity for interface or surface |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01115539 CN1382971A (en) | 2001-04-27 | 2001-04-27 | Measurer of expansion viscosity and elasticity for interface or surface |
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| CN1382971A true CN1382971A (en) | 2002-12-04 |
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| CN 01115539 Pending CN1382971A (en) | 2001-04-27 | 2001-04-27 | Measurer of expansion viscosity and elasticity for interface or surface |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104794965A (en) * | 2015-05-18 | 2015-07-22 | 哈尔滨工业大学 | Liquid surface stress determination experimental platform |
| CN112704910A (en) * | 2021-01-14 | 2021-04-27 | 青岛理工大学 | Organic liquid membrane interface shearing updating extraction device and use method |
| CN112881236A (en) * | 2021-01-14 | 2021-06-01 | 青岛理工大学 | Liquid-liquid extraction interface shear rheology research device |
| CN113237794A (en) * | 2021-05-11 | 2021-08-10 | 西南石油大学 | Method for evaluating influence of salinity on expansion viscoelasticity of foam liquid film |
-
2001
- 2001-04-27 CN CN 01115539 patent/CN1382971A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104794965A (en) * | 2015-05-18 | 2015-07-22 | 哈尔滨工业大学 | Liquid surface stress determination experimental platform |
| CN112704910A (en) * | 2021-01-14 | 2021-04-27 | 青岛理工大学 | Organic liquid membrane interface shearing updating extraction device and use method |
| CN112881236A (en) * | 2021-01-14 | 2021-06-01 | 青岛理工大学 | Liquid-liquid extraction interface shear rheology research device |
| CN112704910B (en) * | 2021-01-14 | 2021-10-22 | 青岛理工大学 | Organic liquid membrane interface shearing updating extraction device and use method |
| CN112881236B (en) * | 2021-01-14 | 2022-03-01 | 青岛理工大学 | Liquid-liquid extraction interface shear rheology research device |
| WO2022151543A1 (en) * | 2021-01-14 | 2022-07-21 | 青岛理工大学 | Research device for shear rheology of liquid-liquid extraction interface |
| WO2022151544A1 (en) * | 2021-01-14 | 2022-07-21 | 青岛理工大学 | Extraction apparatus for shearing and updating organic liquid membrane interface and usage method |
| CN113237794A (en) * | 2021-05-11 | 2021-08-10 | 西南石油大学 | Method for evaluating influence of salinity on expansion viscoelasticity of foam liquid film |
| CN113237794B (en) * | 2021-05-11 | 2022-07-01 | 西南石油大学 | Method for evaluating influence of salinity on expansion viscoelasticity of foam liquid film |
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