CN204718926U - A kind of drop-volume method surveys the device of table (boundary) surface tension - Google Patents
A kind of drop-volume method surveys the device of table (boundary) surface tension Download PDFInfo
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- CN204718926U CN204718926U CN201520329303.8U CN201520329303U CN204718926U CN 204718926 U CN204718926 U CN 204718926U CN 201520329303 U CN201520329303 U CN 201520329303U CN 204718926 U CN204718926 U CN 204718926U
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Abstract
The utility model discloses a kind of device of drop-volume method survey table (boundary) surface tension, device such as schematic diagram is made up of drop volume pipe 1, sample hose 2, the band rubber plug 3 of groove, sample pipe support 4, glass water bath with thermostatic control 5, injection pipeline 6, syringe 7, micro-injection pump 8, iron stand 9; It is characterized by and use micro-injection pump to control to drip speed, can arrange and drip speed to 0.028 microlitre/second, same fast condition can repeatedly repeat and micro-injection pump and drop volume pipe can while reading; The beneficial effects of the utility model are: can carry out low speed titration, reading variation, easy and simple to handle, and accuracy, repeatability are better.
Description
Technical field
The utility model relates to a kind of device of drop-volume method survey table (boundary) surface tension, and this device belongs to apparatus measures field.
Technical background
Drop-volume method is a kind of method of conventional mensuration liquid meter (boundary) surface tension.This method device therefor is simple, and temperature interval is long, and only control by simple temperature, measurement operation is easily grasped, and amount of samples is few, to sample wetness without strict demand.Condition determination, close to balance, is thus used widely in production and scientific research.
Drop-volume method grows up on the basis of drop-weight method.The ultimate principle of this method is: when liquid becomes under drippage at the mouth of pipe, a size that falls is relevant with mouth of pipe radius and surface tension of liquid.If drips moment comes off completely from the mouth of pipe, then a weight that falls and surface tension have following relation:
mg=2πRγ
Wherein m is for falling to dripping weight, and g is acceleration of gravity, and R is mouth of pipe radius.γ is surface tension of liquid, and π is circular constant.This formula represents that the surface tension along mouth of pipe acting by their periphery supports that liquid hangs, and surface tension is contrary with gravity direction; Drop is when suffered gravity exceedes surface tension infinitesimal and all come off from the mouth of pipe.
Along with people are to the continuous research of drop-volume method, test drop volume equipment used also in the process updated.Zhu's control precious jade, and Zhao Guoxi [chemistry circular, 341(1981)] on Harkins working foundation, made a kind of determinator by oneself; Zhang Ke, the people such as Du Zongliang [Sichuan University's journal, 59(2003)] investigate dropper radius on interfacial tension measure affect time also devise a kind of determinator accordingly, these two kinds of devices are all very easy, all can be used for the mensuration of table (boundary) surface tension of solution.
But above-mentioned two kinds of determinators do not have consideration for the two problems existed during drop-volume method chart (boundary) surface tension, namely Accurate Determining droplet size and control drop drip speed etc. be difficult to realize.They are when measuring droplet size and control to drip speed, and pump-up device all selects ear washing bulb, be difficult to control, can not ensure continuity and the accuracy of titration when flow velocity is lower, therefore Accurate Determining droplet size and control drop and drip fast tool and have very important significance.
Summary of the invention
The purpose of this utility model is to provide a kind of device of drop-volume method survey table (boundary) surface tension, for current drop volume device repeatability and poor stability and problem such as measurement result is inaccurate when Accurate Determining droplet size and low speed titration in titration process, devise the device that one accurately can adopt drop-volume method survey table (boundary) surface tension.
In the present invention, drop-volume method surveys the device of table (boundary) surface tension by drop volume pipe 1, sample hose 2, the rubber plug 3 being with groove, sample pipe support 4, glass water bath with thermostatic control 5, injection pipeline 6, syringe 7, micro-injection pump 8, iron stand 9.
The innovative approach that apparatus of the present invention adopt is: control dropping liquid with micro-injection pump and replace original ear washing bulb to control dropper, be characterized in can avoiding in experimentation because controlling the error that the human factors such as ear washing bulb cause, drop volume pipe is with the equal readable of micro-injection pump simultaneously, mutually as reference.
Compared to other drop volume devices, this device adopts micro-injection pump to replace original ear washing bulb control dropping liquid to drip the problem being manually difficult to when first speed solve microtitration accurately control; This device adopts micro-injection pump to replace original ear washing bulb to control dropping liquid to drip speed repeatability is significantly improved; This device adopts micro-injection pump to replace original ear washing bulb to control, and when experimental data reads, with the mutual reference of drop volume pipe reading, makes reading more accurate.
Accompanying drawing explanation
Accompanying drawing is the present utility model installation drawing
Accompanying drawing entitling list: the rubber plug 3 of drop volume pipe 1, sample hose 2, band groove, sample pipe support 4, glass water bath with thermostatic control 5, injection pipeline 6, syringe 7, micro-injection pump 8, iron stand 9.
Embodiment
The using method of apparatus of the present invention is as follows.
(1) sample hose fills sample and fixes, and solution less for the density of concentration known is added sample hose, is fixed by sample pipe support to it.
(2) drop volume pipe dress sample and connection, by drop volume pipe, (transfer pipet ground is made by oneself, test tube port radius), band groove rubber plug, injection pipeline be connected with emulsion tube with syringe, between be coated with vacuum grease sealing, then control syringe and solution large for the density of concentration known is sucked drop volume pipe, stretch in sample hose below liquid level by drop volume pipe, fixing, syringe is fixed on micro-injection pump.
(3) micro-injection pump is set, starts dropping liquid.
(4) control micro-injection pump, slowly form the first dropping liquid drip at the drop volume mouth of pipe, drippage stops micro-injection pump instantaneously, and reading drop volume pipe registration is V
0, micro-injection pump registration returns to zero, and then starts titration, records time of preliminary examination t simultaneously
0, record the number of drops n that drips from start to end and time t, and now drop volume pipe registration V, then (V-V
0)/n is each volume, (t-t
0)/n is each rise time.
Table (boundary) surface tension of solution to be measured is:
Be the density difference of two solution in formula, V is the volume of each, and g is acceleration of gravity, and r is drop volume pipe mouth of pipe radius, and F is and V/r
3relevant correction factor can be tabled look-up (Zhu's control precious jade, Zhao Guoxi, chemistry circular, 341(1981)) obtain.
Below in conjunction with accompanying drawing and example, illustrate the utility model further, but without any restrictions to scope of the present invention.
embodiment:as accompanying drawing, with reference to the using method of apparatus of the present invention, utilize sample pipe support 4 to be fixed in glass water bath with thermostatic control 5 sample hose 2, add a certain amount of 1 × 10
-4m TODGA/ normal octane solution (density is surveyed).Drop volume pipe 1(transfer pipet ground is made by oneself), the rubber plug 3 of band groove, injection pipeline 6 and syringe 7 be tightly connected with emulsion tube, suck a certain amount of distilled water, to stretch in sample hose 2 below liquid level, vertically fix.Syringe 7 is fixed on micro-injection pump 8.Arrange flow velocity, start titration, slowly form the first dropping liquid drip drop volume pipe 1 mouthful, drippage stops micro-injection pump 8 instantaneously, and reading drop volume pipe 1 registration is V
0, micro-injection pump 8 registration returns to zero, and then starts titration, records initial time t simultaneously
0, record the number of drops n that drips from start to end and time t, and now drop volume pipe 1 registration V, then (V-V
0)/n is each volume, (t-t
0)/n is each rise time, and interfacial tension is calculated as follows
At in formula being 20 DEG C, two-phase density difference (0.9982-0.7100) g/mL, V are the volume of each, and g is acceleration of gravity (980.7cm/s
2), r is drop volume pipe mouth of pipe radius 0.1395cm, and F is and V/r
3relevant correction factor can be tabled look-up (Zhu's control precious jade, Zhao Guoxi, chemistry circular, 341(1981)) obtain.
Attachedly survey data:
Claims (5)
1. drop-volume method surveys a device for table/interfacial tension, is made up of drop volume pipe (1), sample hose (2), the rubber plug (3) of band groove, sample pipe support (4), glass water bath with thermostatic control (5), injection pipeline (6), syringe (7), micro-injection pump (8), iron stand (9); Drop volume pipe, injection pipeline are connected with emulsion tube with syringe, the liquid that density is large is sucked by drop volume pipe and fixes, syringe is fixed on micro-injection pump, the liquid that density is little adds sample hose and fixes, drop volume pipe gos deep into below sample hose liquid level to be fixed, the flow velocity of setting micro-injection pump, carries out titration determination.
2. survey the device of table/interfacial tension by a kind of drop-volume method according to claim 1, it is characterized in that: control to drip speed by micro-injection pump.
3. survey the device of table/interfacial tension by a kind of drop-volume method described in claim 1 or 2, it is characterized in that: the control accuracy of micro-injection pump is 0.1mL/h.
4. survey the device of table/interfacial tension by a kind of drop-volume method described in claim 1 or 2, it is characterized in that: micro-injection pump can arrange and drip speed, can repeat.
5. survey the device of table/interfacial tension by a kind of drop-volume method described in claim 1 or 2, it is characterized in that: micro-injection pump and drop volume Guan Jun can read dropping liquid volume.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520329303.8U CN204718926U (en) | 2015-05-21 | 2015-05-21 | A kind of drop-volume method surveys the device of table (boundary) surface tension |
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| CN201520329303.8U CN204718926U (en) | 2015-05-21 | 2015-05-21 | A kind of drop-volume method surveys the device of table (boundary) surface tension |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114295521A (en) * | 2022-01-07 | 2022-04-08 | 四川大学 | Method for measuring surface tension coefficient of liquid by using needle tube |
| CN114324072A (en) * | 2022-01-17 | 2022-04-12 | 四川大学 | Method for measuring surface tension coefficient of liquid by thin plate method |
| CN114354452A (en) * | 2022-01-04 | 2022-04-15 | 四川大学 | Method for measuring surface tension coefficient by dropping liquid drops on needle tube |
| CN114383979A (en) * | 2022-01-21 | 2022-04-22 | 四川大学 | Method for measuring surface tension coefficient of liquid by liquid drop method |
-
2015
- 2015-05-21 CN CN201520329303.8U patent/CN204718926U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114354452A (en) * | 2022-01-04 | 2022-04-15 | 四川大学 | Method for measuring surface tension coefficient by dropping liquid drops on needle tube |
| CN114295521A (en) * | 2022-01-07 | 2022-04-08 | 四川大学 | Method for measuring surface tension coefficient of liquid by using needle tube |
| CN114295521B (en) * | 2022-01-07 | 2023-04-25 | 四川大学 | Method for measuring surface tension coefficient of liquid by using needle tube |
| CN114324072A (en) * | 2022-01-17 | 2022-04-12 | 四川大学 | Method for measuring surface tension coefficient of liquid by thin plate method |
| CN114383979A (en) * | 2022-01-21 | 2022-04-22 | 四川大学 | Method for measuring surface tension coefficient of liquid by liquid drop method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151021 Termination date: 20180521 |