CN2237848Y

CN2237848Y - Liquid interface tension measurer using rotary dropping method

Info

Publication number: CN2237848Y
Application number: CN 95216525
Authority: CN
Inventors: 梅乐和; 余忠华; 朱自强; 吴有庭
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 1995-07-05
Filing date: 1995-07-05
Publication date: 1996-10-16
Anticipated expiration: 2005-07-05

Abstract

The utility model relates to a measurer using a rotary dropping method for liquid interface tension. The upper ends of two supporting bases are provided with a screw rod; a nut on the supporting frame of a sliding plate is engaged with the screw rod; the supporting frame of a sliding plate penetrates a guide rail to form a slide fit; a gear on the sliding plate is engaged with a rack on a microscope; the lower ends of the two supporting bases are provided with a hollow rotating shaft which is connected with a synchronous pulley on a motor via the transmission of a synchronous belt. The known liquid and the measured liquid whose density is different from the density of the known liquid are loaded into a test tube, and are put into the hollow rotating shaft to rotate with high speed; the length or the diameter of the liquid elongated is measured; the interfacial tension is obtained via calculation.

Description

Rotating liquid drop method liquid interfacial tension analyzer

The utility model relates to a kind of device of test liquid interfacial tension.

Interfacial tension is a kind of important basic data, and aspects such as design of its (surface) chemistry and liquid-liquid extraction at the interface and operation are quite important, and its assay method is a lot, but rotating liquid drop method commonly used is measured low interfacial tension.Succeeded in developing the rotating liquid drop method interfacial tensimeter that can be used for measuring low interfacial tension abroad, and commercialization.Yet at home such instrument development there is not report as yet.The several units of only a fews such as Daqing Petroleum Administration introduce the instrument of country's productions such as the U.S., though the measuring accuracy height, structure is complicated, and measurement and debugging require height, and cost an arm and a leg, and also are difficult to bear in general unit.

The purpose of this utility model is: a kind of rotating liquid drop method liquid interfacial tension analyzer with microscope measurement system simple in structure, that measuring accuracy is higher is provided, can solves the problem that exists in the background technology.

The technical scheme that the utility model adopted is: between the two bearings upper end of pedestal screw mandrel is housed, rotating reading drum drive screw mandrel can rotate in the hole of two bearings, the nut that is contained on the sliding plate support is meshed with screw mandrel, a guide rail is housed respectively between two bearings of the upper and lower of screw mandrel, sliding plate support penetrates to form in two guide rails and is slidingly matched, gear on the slide plate is meshed with tooth bar on the microscope, between two bearing upper surfaces graduated scale is housed.The hollow rotating shaft of mounting hole is housed out between two bearing lower ends of pedestal, and the hollow rotating shaft two ends can be rotated in the hole of two bearings, and hollow rotating shaft one end is connected with motor through synchronous pulley, synchronous belt, another synchronous pulley.Above-mentioned two guide rails are respectively cylindrical guide, and ring washer is equipped with at the screw mandrel two ends respectively.

Be equipped with known high density and tested low-density mutually the test tube of liquid be placed on and use high-speed rotation in the hollow rotating shaft, because of action of centrifugal force, make the liquid of tested low-density phase be drawn as the cylinder bodily form, record its length, calculate through formula and can try to achieve the interfacial tension value with microscope.

The utility model is compared with background technology, the useful effect that is had is: this apparatus structure is simple, cost is low, it is convenient to measure and debug, fidelity factor and precision are all higher, error is applicable to the mensuration of the liquid-liquid interface tension force of the biochemical double-aqueous phase system that separates in 3%, all having at aspects such as chemical industry, petroleum industry, food, medicine, agricultural chemicals, mineral floatings extensively has important practical value.

Below in conjunction with accompanying drawing, provide details of the present utility model by description to embodiment.

Fig. 1, front view of the present utility model;

Fig. 2, vertical view of the present utility model;

Fig. 3, left view of the present utility model;

Two kinds of different densities liquid condition enlarged drawings are housed in Fig. 4, the test tube.

As Fig. 1, Fig. 2, shown in Figure 3, two bearings 12 at pedestal 1, screw mandrel 18 is housed between 12 ' upper end, screw mandrel 18 1 ends are equipped with reading drum 11, rotating reading drum 11 drive screw mandrels 18 can be at two bearing 12,12 ' the hole in rotate, the nut 20 that is contained on the sliding plate support 15 is meshed with screw mandrel 18, two bearings 12 of the upper and lower of screw mandrel 18,12 ' cylindrical guide 10 is housed, 7, sliding plate support 15 penetrates guide rail 10, also can be in 7 at guide rail 10, slide in 7, gear on the slide plate 9 is meshed two bearings 12 with tooth bar on the microscope 6, graduated scale 14 is housed between 12 ' upper surface; The hollow rotating shaft 16 of mounting hole is housed out between two bearings 12 of pedestal 1,12 ' lower end, its two ends can two bearings 12,12 ' the hole in rotate.

As Fig. 2, Fig. 3, shown in Figure 4, known high density phase liquid 21 is put full in test tube 13, after covering bottle stopper, with syringe the tested low-density phase of one droplet liquid 22 is splashed in the high density phase liquid 21, test tube 13 is placed in the hollow rotating shaft 16 that has mounting hole, cover stifle 19 hollow rotating shafts 16 and be supported on two bearings 12 of pedestal 1, between 12 ' lower end, starting the motor 2 that is contained on the pedestal 1 rotates, the synchronous pulley 3 of power on motor 2, synchronous belt 4, synchronous pulley 5 on the hollow rotating shaft 16, make the test tube 13 that is in horizontality make high speed rotating, because of action of centrifugal force, make the liquid 22 of tested low-density phase be drawn as the cylinder bodily form (dotting among Fig. 3), till interfacial tension and centrifugal force reach balance.

As Fig. 1, Fig. 2, shown in Figure 3, it is intermeshing being contained in gear on the slide plate 9 and the tooth bar on the microscope 6, rotates the control hand wheel 8 on the slide plate 9, and the gear driven tooth bar moves up and down microscope 6, regulate the microscope focal length, make that to be drawn as tubular liquid imaging clear.Rotate reading drum 11, after screw mandrel 18 rotates, the nut 20 that drives on the sliding plate support 15 rotates, whole measurement bracket is moved laterally along

cylindrical guide

10,7, read twice numerical value on the graduated scale 14, promptly measure the low-density phase liquid cylindrical length L that is elongated, back-up ring 17 is equipped with at screw mandrel 18 two ends.By measuring tested low-density phase liquid volume V, the angular velocity omega of test tube rotation and the density difference Δ P of two liquid phases, just can try to achieve the interfacial tension value γ of this tested low-density phase liquid from following formula:

γ＝1/4π ^-0.5·ΔP.ω ²·V ^0.5·L ^-0.5

Also be carved with the scale of some five equilibriums on the scale in microscope ocular, can directly read the low-density phase liquid cylindrical diameter d that is elongated, according to formula V=π (d/2) ²L, the substitution following formula also can be obtained the interfacial tension γ of tested low-density phase liquid.

Claims

1. rotating liquid drop method liquid interfacial tension analyzer is characterized in that:

1) between two bearings [12] of pedestal [1], [12 '] upper end, screw mandrel [18] is housed, rotation reading drum [11] drive screw mandrel [18] can rotate the nut [20] that is contained on the sliding plate support [15] and be meshed with screw mandrel [18] in the hole of two bearings [12], [12 '], between two bearings [12] of the upper and lower of screw mandrel [18], [12 '] guide rail [10], [7] are housed, sliding plate support [15] penetrates to form in guide rail [10], [7] and is slidingly matched, gear on the slide plate [9] is meshed with microscope [6] upper rack, between two bearings [12], [12 '] upper surface graduated scale [14] is housed;

2) hollow rotating shaft [16] of mounting hole is housed out between two bearings [12] of pedestal [1], [12 '] lower end, hollow rotating shaft [16] two ends can be rotated in the hole of two bearings [12], [12 '], hollow rotating shaft [16] one ends are connected with motor [1] through synchronous pulley [5], synchronous belt [4], synchronous pulley [3].

2. rotating liquid drop method liquid interfacial tension analyzer according to claim 1, it is characterized in that: guide rail [10], [7] are respectively cylindrical guide, and ring washer [17] is equipped with at screw mandrel [18] two ends respectively.