CN107457012A - For the micro flow control chip device of the double mode coupling driving of hydrophobic base sheet matter - Google Patents

Abstract

The present invention relates to a kind of micro flow control chip device of the double mode coupling driving for hydrophobic base sheet matter, belong to analysis testing field.The substrate of micro-fluidic chip, physical presence series problem are made using dimethyl silicone polymer i.e. PDMS that is cheap and easily processing.This case main points are, the selected PDMS with ecosystem surface of substrate, and its neighbor positions fixes installing miniature ultrasonic transducer units in the sample liquid stream terminal of the micro-fluidic chip, with driving force of the ultrasonic wave induced synthesis based on interfacial tension difference, its driving force couples running with Micropump simultaneously, collaboration drives test liquid to flow to terminal direction flowing, micron silica granule filler is filled up in its pipeline of the chip, its function of the filler includes supporting pipeline inwall, and, with the set of hydrophily fluid channel come the hydrophobic pipeline of compensatory script, and, extruding, cover inner-walls of duct face and thereby reduce the chance that large biological molecule contacts with the internal face.

Description

For the micro flow control chip device of the double mode coupling driving of hydrophobic base sheet matter

Technical field

The present invention relates to a kind of micro flow control chip device of the double mode coupling driving for hydrophobic base sheet matter, belong to point Analyse testing field.

Background technology

For the microflow control technique overall general picture of itself, famous micro-fluidic expert Mr. Lin Ping Cheng may refer to not The monograph " diagram Microfluid based Lab on a chip " gone out before long, the monograph is published via Science Press, and the monograph is for miniflow Past of control technology, now, and, vision of the future etc. etc., suffer from detail, be deep into long opinion of detail State.

The field that micro-fluidic chip is often applied to include to containing large biological molecule sample solution carry out it is various analysis, Detection.

The basic framework of micro-fluidic chip, including it is etched with the substrate of conduit and the cover plate to fit together therewith, institute State the fluid course on substrate, before upper cover plate is assembled, it is apparent on see to be exactly some conduits, wait until lid is covered thereon After piece, just really closure forms the fluid course, and the conduit inner surface of the conduit is together with the part that surround the conduit Cover plate forms described fluid course together；So, it is clear that assemble the fluid course after completing, its inner surface face Long-pending major part is the inner surface area of that conduit, and in other words, the state or property of the conduit inner surface are substantially determined The integrality or property of the fluid course are determined；Therefore say, the inner surface state or interior of this conduit of the structure on substrate Surface nature is key factor；In principle, any material that can be kept or keep its solid forms substantially, can be used To make substrate and cover plate, such as, the material that can act as substrate and cover plate can be monocrystalline silicon piece, quartz plate, sheet glass, height Polymers such as dimethyl silicone polymer, polymethyl methacrylate, makrolon etc.；Certainly, the selection of substrate and the choosing of cover plate Material be able to can also be differed with identical；From the point of view of material consumption, manufacture difficulty and application popularization prospect etc. etc., these Not small difference, the especially selection of that substrate between material be present, have a great influence.

In various substrate making materials, dimethyl silicone polymer, i.e. PDMS, comparatively very easily shaping, at this It is extremely simple that conduit is made on the substrate of sample, and the lower cost for material, substrate is made with the polydimethyl siloxane material, Conduit is being suppressed or etched thereon, and is being engaged with the cover plate that the cheap material such as glass or polypropylene or other plastic sheets makes, It is a kind of more satisfactory selection seemingly；Certainly, patch material can also select to use cheap polydimethyl siloxane material： So, this substrate selection is the scheme of polydimethyl siloxane material, and material is extremely cheap, and making is extremely simple, seems and should also be as It is extremely easy to popularize, promotes.

But thing is really not so simple.

First, this polydimethyl siloxane material, that is, the material that alphabetical PDMS is referred to of abridging, itself are a kind of strong Strong hydrophobic material, conduit is built on this material, if without being operated for the modified of the conduit surface, then, it is whole After body assembling is completed, that is, after covering cover plate, because the conduit its inner surface in structure occupies most fluid course Inner surface, then, its strong hydrophobic property of the PDMS conduits inner surface, is deciding factor, it can be similar to water The fine liquid stream of polar liquid of solution by becoming very difficult, its flow resistance is big, or even in general Micropump is all difficult to Promote, certainly, if cover plate also selects to use the PDMS material, then, problem is substantially identical, similar；Therefore, existing Among having technology, modification is modified particular for the conduit inner surface on the PDMS material, is necessary operation；So, this The individual modified operation for PDMS conduit inner surfaces is pretty troublesomeThat falls nor this problem, forms serious technical puzzlement, It is another problem：PDMS polymer molecules inside its body phase of this PDMS material substrate have to be diffused to the surface, moves automatically The characteristic of shifting, the characteristic that this substrate body phase inside PDMS polymer molecules are diffused to the surface, migrated automatically, will cause by table State after the modification of its inner surface of that conduit of face modifying and decorating can not maintain the sufficiently long time, and that is through surface Holding time for conduit its inner surface state after modification is substantially only sufficient to the time needs for completing laboratory internal test experiments； In other words, by surface is modified or the PDMS conduit inner surfaces of surface modification, after it is modified or institute's shape after modification is said Into surface state can not be lasting, but soon automatically tend to or say become again surface be modified before surface state, compared with The strong hydrophobic surface state of that script is returned in the short time, then, just think, such micro-fluidic chip can be big Amount making, mass storage, it is widely popularized, answer is it is obvious that is, impossible.Conduit on this PDMS material, does not do If surface modification, it can not pump and pass through similar to the fine liquid stream of polar solvent of the aqueous solution, chip also cannot just use；And such as Fruit has been cooked surface modification, can not persistently keep its state after modifying again, or equally can not popularization and application.

According to the literature, there is a kind of expedient solution, be that a small amount of surface-active is added in sample to be tested solution Agent, so as to which during test, dynamic, temporary transient effective surface hydrophilic layer is built temporarily in the PDMS conduits inner surface； However, due to the amphipathic characteristic of surfactant, the introduced surfactant of the program is inevitable simultaneously also can be with sample solution In tested composition occur combination so that tested composition can not be detected normally or it is detected ratio and dubiously dropped It is low；The surfactant is possibly even fully wrapped around by tested composition with micelle form so that tested composition can not be detected or Identification；Therefore, this kind adds the scheme of surfactant into sample solution, is far from a preferable solution.

So, how to accomplish that substrate can either be made using cheap PDMS material, and the conduit can be released Inner surface decorating state can not persistently, chip can not largely make, largely lay in and then be widely popularized and such a make this area The puzzlement that numerous professionals are entangled with for a long time, the highly difficult problem that exactly one its obvious technology barrier can not despise.

Be present many year in the highly difficult problem, so far, not yet properly settled.

Second, the PDMS material of non-surface modification, it is stated that, its surface is strongly hydrophobic above, this strong hydrophobic Material surface and also have another problem, that is, this strong hydrophobic PDMS surfaces can adsorb large biological molecule, and And these adsorbed large biological molecules can also further depression further on PDMS surfaces, gradually fall into it is gradually deep, until It is heavy to be trapped within the body phase of PDMS substrates, in fact, this process, partly it is also due to PDMS material body phase interior polymer Molecule, which has, to be diffused to the surface, caused by travel motion；Such case, it can also be explained from another angle, i.e. continue not Disconnectedly from inside PDMS body phases to those polymer molecules of its diffusion into the surface, migration, its result moved, be little by little by that It has been involved in a bit by the large biological molecule of adsorption within the body phase of PDMS substrates, briefly, these adsorbed biologies Macromolecular is exactly to be swallowed up by PDMS substrate body phases；So, this PDMS substrates body phase swallows up the phenomenon of large biological molecule, its institute Caused by influence, necessarily cause the severe deviations of all kinds of test data of experiment for being related to large biological molecule.

As described above, the problem of PDMS substrates, is, its not only adsorption large biological molecule, and swallow up biological big point Son, so, as the large biological molecule of experiment test object, its disappearance will not stop because surface saturation is adsorbed, and It is, it is constantly adsorbed, also constantly swallowed up.

On PDMS substrates, its body phase is constantly swallowed up and tests showing for associated biomolecule macromolecular in related experiment test process As, it is to say that another kind, which is explained, substantial amounts of Minute pores in PDMS body phases be present, associated biomolecule macromolecular by after adsorption, Depression enters these Minute pores, and then is swallowed up；However, inventor thinks, those can allow the sky of miniature scale Qi leel squeezes into the Minute pores therebetween, not equal to saying that they also can directly allow the large biological molecule of relative large scale to enter Enter, both difference on yardstick are huge, must not make sweeping generalizations.Explanation is bypassed, in any case, as dependence test analysis object Large biological molecule is adsorbed by PDMS substrate conduits inner surface, and then is constantly swallowed up by PDMS substrate body phases, and this is known objective Existing phenomenon.

, can be from containment PDMS surfaces pair in order to prevent swallow up effect of this PDMS substrate bodies relative to large biological molecule The absorption of large biological molecule addresses, and method is chemically modified modification aiming at the PDMS material surface, for For PDMS is the situation of substrate material, modification exactly is chemically modified to the surface of described channel portion, by chemistry The conduit inner surface of modification, can contain its absorption to large biological molecule, and then avoid large biological molecule quilt PDMS substrate body phases are swallowed up；But or that old problem, that is, the chemical modification on PDMS material surface is modified it Surface state afterwards can not persistently be kept, the polymer molecule inside the PDMS substrate body phases its diffuse to the surface, migrate automatically Process, can soon by that by surface chemical modification be modified conduit inner surface state become again script it is strong it is hydrophobic simultaneously And the state of strong adsorption large biological molecule, in other words, no matter how professionals in the field turn from side to side, the PDMS substrates its Conduit inner surface is always rapidly to strong hydrophobic surface state evolution.

So, how can either obtain that PDMS material price is extremely cheap, substrate makes extremely easy benefit, and can is enough Reach and contain the absorption process of the PDMS substrate conduit inner surfaces to large biological molecule for a long time, and then prevent PDMS substrate bodies relative The effect of swallowing up of large biological molecule so that related chip manufactured goods are able to maintain that a prolonged enough, rational shelf-life, It is exactly a very intractable problem.The problem equally makes this area numerous specially as another problem addressed above Industry personnel are entangled with, perplexed for a long time, and the problem is equally the highly difficult problem that its obvious technology barrier can not despise.Should Also be present many year in problem, so far, also not yet properly settled.

Third, as described above, the PDMS conduit inner surfaces are strongly hydrophobic, and targetedly surface chemical modification or come to the surface Learn modification to be difficult to again persistently, therefore, actually can only still belong to effective in the surface state after the modification of its surface or surface modification It is used within short-term；If having had been subjected to that ofer short duration period of validity, and still by force if use, due to surface State already again close to hydrophobic state, then certainly exists bigger flowing using usual Micropump driving sample liquid stream and hindered Power, so, just by increasing Micropump pump power and pumping pressure test liquid can only be forced to flow to target direction flowing, as above institute State, this PDMS material is soft, and sample liquid stream is pumped with too high, mechanical pumping pressure, will cause the substrate its Bubbling, expanded, distortion, deformation, also, this high-pressure situations occur for the conduit that sample introduction end includes sample introduction end near zone Under, the stripping between substrate and cover plate, this feelings also easily occur in the sample introduction end and its conduit of near zone and its periphery Under shape, sample solution flows in the crack for entering appearance of the stripping afterwards between the substrate and cover plate of formation everywhere, this Actually result in the damage of the micro-fluidic chip；Certainly, it is not in place if surface modification or surface modification script, also result in There is said circumstances within the of short duration usual term of validity；In the case where carrying out liquid stream driving using additional Micropump merely, The above-mentioned problem exists all the time.As described above, if it is preposition not do any surface modification or surface modification etc. completely Operation, then, the above-mentioned problem will be even more serious, even without conduit bubbling described in sample introduction end and its near zone, swollen occurs The problems such as changing, being peeled off between distortion, deformation and substrate and cover plate, merely because the flow resistance is excessive, using high pressure Micropump Also sample liquid stream may not can be driven to be marched forward towards terminal side.

Fourth, the polydimethyl siloxane material, namely PDMS material, the active force very little wherein between polymer molecule, The polymer molecule of low polymerization degree inside its body phase is in constantly into the dynamic process of surface migration, therefore, includes PDMS After it has been formed, the surface topography in its inner-walls of duct face of chip can be because of described low polymerization degree polymer point for the chip of substrate material Son moves about, pours into the surface and change, and the change of its pattern is somewhat similarly to Rheological Deformation, trickling deformation or creep and become Pattern caused by shape institute is possible changes；In the higher PDMS material of some low polymerization degree component ratios, this kind somewhat similar Can be showed in the phenomenon of Rheological Deformation, trickling deformation or the deformation of creep must be than more significant；This kind include PDMS substrates chip its The dynamic of inner-walls of duct surface topography after shaping changes property, namely the described property or stream that are somewhat similarly to Rheological Deformation Dropping down the property of deformation or the property of the deformation of creep, the word of rheology one is applied mechanically in this case, integration, also referred to as the rheological equationm of state or rheology become Shape property, the dynamic of corresponding inner-walls of duct face pattern change, and this case is also referred to as rheology；As described above, because of this kind of material Expect certain Rheological Deformation property as described above that its own has, its manufactured goods actually can at leisure Rheological Deformation and cause The manufactured goods total form generation changes；Influence caused by its Rheological Deformation property, it is to be not easy to feel in terms of macroscopic perspective Examine, still, for the very fine micro-fluidic chip of its internal structure, the rheological equationm of state can but cause bigger shadow Ring, the fluid course namely the pipeline therefore, during pre-production formed, because the wall of its tube chamber of pipeline is main It is the wall of PDMS materials, so, the cross-sectional area of the pipeline actually can gradually become because of rheology over time It is small, stated differently, since the reason for the rheology, the natively finer pipeline that is flowed through for liquid sample Its tube chamber the more can become the more narrow, in the case of flow time is sufficiently long, or even the pipeline tube chamber can partly close or all Ground closes, and then make it that sample fluid course is thoroughly blocked, and closes with being even also not reaching to its luminal part of pipeline The degree closed or fully closed, its fluid passage that can be provided of that pipeline narrow because of rheology, then, in pipeline Its inner surface originally be exactly strongly it is hydrophobic in the case of, aqueous sample liquid is just more difficult to by becoming more so because of rheology Narrow micro-channel, then, the influence of substrate rheology how is resisted, maintains the basic framework of the pipeline not occur seriously to become for a long time The problem of shape, also, keep the long-term unobstructed of the pipeline is exactly a urgent need to resolve.

The content of the invention

The technical problem to be solved by the invention is to provide a package solution, while solve to address above A series of problem.

The present invention solves the technical problem by following scheme, and the device that the program provides is that one kind is directed to hydrophobic substrate The micro flow control chip device of the double mode coupling driving of material, the structure of the device include micro-fluidic chip, the micro-fluidic chip Structure include being bonded to each other installing substrate and cover plate together, its test liquid of the micro-fluidic chip flows into sample end and the sample The terminal of fluid flow is located remotely from each other, and the distance between the sample introduction end and the terminal are between 3 centimetres and 10 centimetres, emphasis It is that its material of the substrate is dimethyl silicone polymer material, its surface of the substrate is the surface of primary form, the primary form Surface its be intended to refer to the primary form of the not material by any surface chemical modification or any surface chemical modification Surface, the structure of the device also includes miniature ultrasonic transducer units, and, higher-order of oscillation electric signal transmission cable, the high frequency One end of vibration electric signal transmission cable links together with the miniature ultrasonic transducer units, and the miniature ultrasonic transducer units attach Ground is installed in the position of the cover plate of the micro-fluidic chip or the neighbouring terminal of substrate；Its is main for the miniature ultrasonic transducer units Function is in the actual sample introduction test of micro-fluidic chip, utilizes the sample introduction end and the terminal and the miniature ultrasonic transducing Difference in the distance between device installation position difference and its ultrasonic intensity experienced, sample introduction end described in induced synthesis Difference between its interfacial tension and the terminal its interfacial tension, the interfacial tension difference between the micro-fluidic chip both ends Pressure gap can be formed between the both ends of the micro-fluidic chip, the pressure gap can drive sample solution to the terminal stream It is dynamic；Softness simultaneously has its function of the substrate of the dimethyl silicone polymer material of elasticity including with its property to the strong absorption of ultrasonic wave Matter, ultrasonic wave is absorbed strongly, and thereby in micro-fluidic chip terminal to the limited short distance between the sample introduction end The rapid decrement of ultrasonic intensity is realized within；And Micropump, the Micropump are connected with the sample introduction end, the Micropump is built-in Micropump or external Micropump；The function of the Micropump is to come the institute with ultrasonic wave induction with the mechanicalness pumping strength of the Micropump State the interfacial tension difference between both ends its caused driving force to support mutually, adjust mutually, be mutually coupled, to cooperate with fortune The mode of work pools the strength that one driving test liquid flows to the terminal direction flowing；Described its thickness of cover plate and substrate is equal Between 1.0 millimeters and 5.0 millimeters；And many silica dioxide granules, many silica dioxide granules are filled in this In the pipeline of micro-fluidic chip, its tube chamber of the pipeline is filled up by many silica dioxide granules, the silica dioxide granule For its particle size range between 10 microns and 200 microns, the silica dioxide granule is silica crystalline particles, silica glass Glass particle or silica composition its inorganic glass particles of shared percentage by weight more than 80%.

Its particle diameter of the silica dioxide granule can be that the basis between 10 microns and 200 microns is actually needed and any The particle diameter specified, such as 10 microns, 30 microns, 70 microns, 100 microns, 150 microns or 200 microns of the particle diameter, etc..

The scope of further preferred its particle diameter of the silica dioxide granule is between 100 microns and 200 microns.

Its pattern of the silica dioxide granule is unlimited, and the silica dioxide granule for example can be spheric granules, rod-shaped particles, length Cube shape particle or any amorphous granular.

The various silica dioxide granules manufacturing technology of itself is known technology.

Various forms, the silica dioxide granule market of all size are on sale.

The silica dioxide granule can also customize to specialized factory.

The preferred scope of its internal diameter of pipeline is between 500 microns and 1000 microns；It is but excellent compared to above-mentioned The internal diameter of the pipeline scope of choosing, more tiny internal diameter of the pipeline or thicker internal diameter of the pipeline are also what this case was allowed.

The word of Micropump one art-recognized meanings of itself are known for the professional in micro-fluidic chip field.

The Micropump both can be the Micropump of external form；The Micropump can also do into or say the embedded micro-fluidic chip The Micropump of the built in version of its internal sample introduction end structure position or the sample introduction end Near-neighbor Structure position.

For example miniature piezoelectric pump of the Micropump, miniature peristaltic pump or miniature air driven pump.

Only for professional of the word of ultrasonic transducer one art-recognized meanings of itself for ultrasonic technology field, It is known.

Various sizes, variously-shaped ultrasonic transducer are commercially available；Its size of commercially available miniature ultrasonic transducer units It may diminish to the magnitude only calculated with millimeter.

Only with regard to miniature ultrasonic transducer units its technique for fixing on general industry application solid body surface its It is known general technology for the professional in ultrasonic technology field for body.This case is not to this expansion superfluous words.

Only with regard to naked PDMS substrates itself conduit molding or lithographic technique for, be open-and-shut known technology.

The industrial products market of involved its all size of higher-order of oscillation electric signal transmission cable is on sale.

The structure of the device can also include higher-order of oscillation electric signal generator；The higher-order of oscillation electric signal transmission cable Its other end can be connected with the higher-order of oscillation electric signal generator.

The involved higher-order of oscillation electric signal generator technology of itself, come for the professional in ultrasonic technology field Say, be simple and known；The higher-order of oscillation electric signal generator can customize to ultrasonic instrument specialized factory.

The preferred scope of its specified ultrasonic wave transmission power of the miniature ultrasonic transducer units is between 2 milliwatts and 9000 milliwatts Between；The preferred scope of the frequency of its ultrasonic wave operationally launched of the miniature ultrasonic transducer units be between 100KHz with Between 12MHz.

This case device can further include some annexes certainly, and the annex can for example coordinate with micro-fluidic chip The electrically or optically detection device used.The equipment that the electricity, optics etc. are used cooperatively with micro-fluidic chip, may refer to The monograph.

The cover plate in chip structure, its material can allow to be any electrical insulating property material, such as：Polypropylene, Glass, polymethyl methacrylate, dimethyl silicone polymer, etc., in order to make smaller size of micro-fluidic chip, for example do Into the micro-fluidic chip of only 2.0 centimetres to 3.0 centimetres of super-small of length, and realized in the extremely short distance to ultrasonic wave Extremely fast decay, can preferably dimethyl silicone polymer be used as cover plate.Certainly, selected on large-sized micro-fluidic chip Using dimethyl silicone polymer it is used as the cover plate, and this case technical scheme is allowed.

Described its thickness of cover plate and substrate can allow be any setting the thickness for being easy to assembling, the thickness of recommendation or say Preferable thickness is between 1.0 millimeters and 5.0 millimeters.Less thickness is advantageous to save material.

It is an advantage of the invention that its close position installs miniature ultrasonic with attaching in the terminal of the micro-fluidic chip Wave transducer, with the ultrasonic wave of miniature ultrasonic transducer units transmitting low-power, high-frequency band, meanwhile, utilize poly dimethyl silicon Its strong absorbability to ultrasonic wave of oxyalkyl piece, in shorter distance, it is, from the terminal to the sample introduction In the very short distance of only several centimeters yardsticks between end, reach the rapid decrement of ultrasonic intensity, thereby in the micro-fluidic core The difference of the interfacial tension is caused at the both ends of piece, and the pressure gap that this kind is formed by Ultrasonic Radiation itself is exactly One driving strength of sample solution to the end flow, at the same it also and the driving force that is provided of Micropump intercouple, Collaboration, above-mentioned two bursts of strength make a concerted effort to drive sample liquid stream to flow to the terminal direction in the pipeline in the lump.

Its scheme of this case and by the pipeline except electrode installation take up space in addition to all clearance spaces whole Filled up with the silica dioxide granule.Those are filled in the silica dioxide granule in pipeline, and this case is to its overall abbreviation titanium dioxide Silicon grain filler, its function include support, withstand the tube chamber of the pipeline its inwall so that the tube chamber of the pipeline is from because of institute State rheology and narrow, prevent its reduced cross-sectional area of the tube chamber of the pipeline or even close, so as to maintain the base of the pipeline for a long time Serious deformation does not occur for this framework.

Numerous silica dioxide granule entities are mutually banked up under this case framework together at random in the pipeline, the titanium dioxide The function of silicon grain filler, also include certainly with the hydrophilic surface of its silica dioxide granule, utilize each adjacent titanium dioxide Mutual formed complications are continuous and its inner surface that is mutually close together by water-wetted surface of silicon grain has hydrophilic The space of property, in the hydrophilic fluid channel of the pipeline Inner Constitution network morphology, although this complications can be continuous All the time the fluid channel with hydrophilic nmature, then, inside the tube chamber of the pipeline simultaneously and a plurality of miniflow deposited The effect of its synthesis of road, integrated, cumulative superposition in other words, is the equal of the relatively fine hydrophilic capillary of caliber Passage；Its presence of the continuous hydrophilic fluid channel of the complications, the PDMS of the primary form is counteracted to a large extent The flow resistance for liquid sample caused by the strong hydrophobic property in its surface of substrate；In other words, because of liquid sample, it is accounted for The composition of maximum ratio is water, and liquid sample is substantially exactly the aqueous solution, therefore, the presence of the silica dioxide granule filler, Can significantly overcome with the unmodified PDMS substrates of hydrophobic property and surface its to the aqueous solution it is incompatible, repel and Barrier effect, so be greatly reduced belong to properties of Aqueous Solution sample liquid stream its be advanced through the resistance of pipeline.

Under this case framework, inside the tube chamber of the pipeline, the area of its lumen wall wall of former pipeline, because of described two The rigid of silicon oxide particle filler ties up, the table of part hydrophobic property that still can also be exposed on lumen wall wall Its area of face is already dramatically reduced, and the area on its still exposed part surface for belonging to hydrophobic property is much Less than the wall surface area of the hydrophobic property of the lumen wall wall in the presence of no silica dioxide granule filler； So, under this case framework, in its lumen of the pipeline, its remaining hydrophobic surface increases surface newly with hydrophilic part, and it is folded Adding, comprehensive, summation, cumulative technique effect, is to form the surface for tending to be hydrophilic on the whole；In other words, in institute State inside the tube chamber of pipeline, its interfacial tension between sample solution of the part surface of remaining hydrophobic property, plus parent The part of aqueous nature increases its interfacial tension between sample solution of surface newly, that it is superimposed, comprehensive, summation, cumulative Technique effect, be so that its solid-liquid interfacial tension inside the tube chamber of the pipeline synergy level off to capillary glass tube its Interfacial tension between tube chamber inner surface and sample solution.

On the other hand, due to its rheological equationms of state of the PDMS as substrate material, it is filled in the pipeline The interior silica dioxide granule filler, can gradually by constantly Rheological Deformation and to arest neighbors free space promote PDMS The pipeline wall of material more tightly wraps up, and this process eventually causes those part two for pressing close to the lumen wall wall Silicon oxide particle is stuck in original place or is stuck in original place or embedding in-situ silica dioxide granule and its embedded in original place, the part Incarceration is together, described due to this reason each other for the remaining silica dioxide granule banked up with being mutually closely packed together Silica dioxide granule filler just will not move in the pipeline easily, silica dioxide granule therein be also substantially all by Original place is locked in, therefore the stream framework of the micro-fluidic chip can be kept for a long time.

The particle size range of its particle of this case silica dioxide granule filler between 10 microns and 200 microns, compared to For general organic molecule, general large biological molecule, the particle diameter of its particle of this case silica dioxide granule filler can be rated as huge Greatly, due to its huge particle diameter, and the inner surface of the surface of its polarity and the pipeline of strong hydrophobic PDMS materials can not Mutually perhaps say and mutually melt, then, the huge silica dioxide granule of this kind of particle diameter can not be by the pipeline of PDMS materials Surface is adsorbed, and can not more be swallowed up by the inner surface of the pipeline of PDMS materials, the huge titanium dioxide of this kind of particle diameter Silicon grain surely not be fully sunk in easily or sink to completely PDMS materials its among intrinsic many Minute pores, and Because above it is stated that the rheology the reason for, the silica dioxide granule filler can be stuck in original place in other words it is embedding In original place without moving easily.

Inside the tube chamber of the pipeline, its lumen wall wall of former pipeline is entirely the surface of hydrophobic property originally, such as Upper described, under this case framework, rigid because of the silica dioxide granule filler ties up, on lumen wall wall still also Its area of the surface of part hydrophobic property that can be exposed is already dramatically reduced, and it is still exposed to belong to hydrophobicity The area on the part surface of matter has been far smaller than the tube chamber in the presence of no silica dioxide granule filler The wall surface area of the hydrophobic property of inwall wall；The reason for because of the rheology, it is close to those dioxies of lumen wall wall Silicon carbide particle, little by little it is partially embedded into or is partly absorbed among the lumen wall wall, the dioxy among the state Silicon carbide particle its towards the part surface of lumen wall wall with have occurred and that matching deformation the lumen wall wall it is tight Closely connected conjunction, then, the matching is deformed and closely pasted with silica particles having occurred and that in lumen wall wall The part wall of conjunction actually can not contact with flowing through the sample solution of pipeline, that is to say, that the wall of this part is Through suction-operated can not be produced to the large biological molecule therein that flows through the sample solution of pipeline and organic molecule.Based on above-mentioned Mechanism, then because fill up the pipeline the silica dioxide granule filler its presence, its lumen wall wall of the pipeline The overwhelming majority in face is tightly covered, and these described walls tightly covered can not be with flowing through the pipeline Sample solution contact, only remaining fraction be not brought into close contact by its surface of silica dioxide granule, tightly cover Hydrophobic surface may be contacted with sample solution, in other words, under this case framework, large biological molecule in sample solution and have Its direct touch opportunity with hydrophobic PDMS walls of machine molecule is significantly reduced, thus, the lumen wall faces of PDMS materials its The adsorptive hindrance and interference of swallowing up of large biological molecule and organic molecule are greatly reduced；As described above, this case scheme Be advantageous to exclude or weaken the adsorptive hindrance and swallow up interference, be advantageous to be lifted the reliability of correlation analysis test data.

As described above, this case silica dioxide granule filler, its function actually includes being similar to being directed to PDMS materials Inner surface of pipeline carry out chemical modification effect, functioning as its this respect of this case is by the pipeline of the PDMS materials Surface by the surface modification of hydrophobic property into the surface of hydrophilic nmature, still, with general, usual PDMS surface chemical modifications Its hydrophilic chemical decorative layer retention time is short, hydrophilic effect can not keep situation prolonged enough different, particle described in this case Huge silica dioxide granule filler, its particle being stuck by rheology can not both be moved easily, its huge particle diameter Particle can not more be swallowed up easily by the inner-walls of duct of PDMS materials, and therefore, its from this respect is similar to surface chemical modification Technique effect on see, its technique effect of this case, be form it is permanent, can not erase, can not consume, not be corroded, not by Hydrophilic surface reforming layer swallowing up, being not dissolved, it is just comparable to one kind in its correlation table of PDMS base materials in effect The permanent hydrophilic modifying superficial layer built on face.

With the simultaneous Micropump of miniature ultrasonic transducer units in its structure of micro-fluidic chip, its function is, with this Its caused drive of the interfacial tension difference that the mechanicalness pumping strength of Micropump is come between the both ends of ultrasonic wave induction Amount of power is supported mutually, adjusts mutually, is mutually coupled, and is pooled in a manner of Collaboration described in one driving test liquid flow direction The strength of terminal direction flowing；The presence of the Micropump so that the miniature ultrasonic transducer units its ultrasonic wave emissive porwers can be by Appropriateness is allowed to reduce, this is particularly suitable for for the situation containing ultrasonic wave sensitive composition in detection object；And because this is miniature super The presence of acoustic wave transducer and its radiated ultrasonic wave, the micro-fluidic chip its both ends interfacial tension can be induced and difference occur And the special driving force for being directed to sample solution is thereby brought, meanwhile, due also to being filled out in its pipeline of this case micro-fluidic chip Fill the silica dioxide granule with hydrophilic nmature, then, in the scenario above, its resistance of flowing in the pipeline of sample liquid stream Power is greatly reduced, and correspondingly, its running resistance of the Micropump is greatly reduced, and so, the Micropump just can be with than relatively low pumping pressure Power carries out the pumping work for the sample solution, because mechanical pumping pressure is greatly reduced, therefore, such one Under kind of situation, be just not susceptible to because the sample introduction end caused by sample introduction end Micropump its mechanicalness pumping pressure is excessive and its near The problems such as stripping between the conduit bubbling in region, expansion, deformation, distortion and the region substrate and cover plate etc.；This case should Dual drive couples the scheme of running and added for the handling of sample fluid flow action, can allow for using ultrasound Intensity of wave, ultrasonic frequency, Micropump pump power, Micropump pumping pressure etc. multiple indexs are fast to be directed to the flowing of the flowing Rate, flowing action include flow forward or pause flowing or acceleration flowing etc. flowing action carry out multi-parameter and accurately manipulated；Such as It is upper described, the presence of the Micropump so that its ultrasonic wave emissive porwer of the miniature ultrasonic transducer units can be allowed to appropriate reduction, So, the feature additionally aids described its sensitive coating of working electrode of protection, is allowed to from ultrasound injury.

Based on this case scheme, completely without carrying out coming to the surface for its relevant surfaces of dimethyl silicone polymer substrate Modification or surface chemical modification operation are learned, therefore, this surface chemical modification layer or surface chemical modification layer not need In the presence of, then, its body phase interior polymer molecule of the dimethyl silicone polymer substrate constantly diffuses to the surface, migrates its institute automatically It is caused that the damaging influence of the surface chemical modification layer or surface chemical modification layer is also just not present.

It is related that the technical scheme of this case has dissolved its application to dimethyl silicone polymer substrate addressed above totally A series of technical barriers.Based on this case scheme, this kind be very cheap and the easily dimethyl silicone polymer material of processing and fabricating Material be just possible in the micro-fluidic chip its prepare, production, using etc. field play bigger effect.

Brief description of the drawings

Fig. 1 is its rough outside side view of this case device.

In figure, 1 is the substrate of dimethyl silicone polymer material, and 2 be cover plate, and 3 be higher-order of oscillation electric signal transmission cable, 4 It is miniature ultrasonic transducer units, 5 be the sample introduction end of the micro-fluidic chip, and 6 be the terminal of the micro-fluidic chip, and 7 are Micropump, 8 be infusion tube；Arrow in legend indicate the micro-fluidic chip its in actual motion, it is poor by pressure at two ends Driving, the flow direction of its sample liquid stream.

Embodiment

In this case that Fig. 1 is shown embodiment, the structure of the device includes micro-fluidic chip, the micro-fluidic chip Structure includes being bonded to each other the substrate 1 and cover plate 2 of installing together, and its test liquid of the micro-fluidic chip flows into sample end 5 and the examination The terminal 6 of sample fluid flow is located remotely from each other, the distance between the sample introduction end 5 and the terminal 6 between 3 centimetres and 10 centimetres, Emphasis is, its material of the substrate 1 is dimethyl silicone polymer material, and its surface of substrate 1 is the surface of primary form, and this is primary The surface of form its be intended to refer to the original of the not material by any surface chemical modification or any surface chemical modification The surface of raw form, the structure of the device also include miniature ultrasonic transducer units 4, and, higher-order of oscillation electric signal transmission cable 3, one end of the higher-order of oscillation electric signal transmission cable 3 links together with the miniature ultrasonic transducer units 4, the miniature ultrasonic Transducer 4 is installed in the position of the cover plate 2 of the micro-fluidic chip or the neighbouring terminal 6 of substrate 1 with attaching；The miniature ultrasonic Its major function of wave transducer 4 is in the actual sample introduction test of micro-fluidic chip, utilizes the sample introduction end 5 and the terminal 6 Difference in the distance between the installation position of miniature ultrasonic transducer units 4 difference and its ultrasonic intensity experienced It is different, the difference between its interfacial tension of sample introduction end 5 described in induced synthesis and the terminal 6 its interfacial tension, the micro-fluidic chip Interfacial tension difference between the both ends 5,6 can form pressure gap between the both ends 5,6 of the micro-fluidic chip, the pressure Difference can drive sample solution to be flowed to the direction of terminal 6；The base of the dimethyl silicone polymer material that is soft and having elasticity Its function of piece 1 includes, with its property to the strong absorption of ultrasonic wave, absorbing ultrasonic wave strongly, and thereby micro-fluidic at this The chip terminal 6 is to the rapid decrement that ultrasonic intensity is realized within the limited short distance between the sample introduction end 5；It is and micro- Pump 7, the Micropump 7 are connected with the sample introduction end 5；The function of the Micropump 7 is to be come with the mechanicalness pumping strength of the Micropump 7 super with this Interfacial tension difference its caused driving force between the both ends 5,6 of sound wave induction supports mutually, adjustment, mutually mutually It is coupled, the strength that one driving test liquid flows to the direction of terminal 6 flowing is pooled in a manner of Collaboration；The lid Piece 2 and substrate 1 its thickness are between 1.0 millimeters and 5.0 millimeters；And many silica dioxide granules, the two of many Silicon oxide particle is filled in the pipeline of the micro-fluidic chip, and its tube chamber of the pipeline is filled out by many silica dioxide granules Full, for its particle size range of the silica dioxide granule between 10 microns and 200 microns, the silica dioxide granule is titanium dioxide silicon wafer Its unorganic glass of shared percentage by weight more than 80% of state particle, silica glass granule or silica composition Grain.

Arrow in legend indicate the micro-fluidic chip its in actual motion, by both ends 5,6 pressure differentials drive, its The flow direction of sample liquid stream.

Fig. 1 is depicted without the associate members such as the higher-order of oscillation electric signal generator.

Involved miniature ultrasonic transducer units 4 are commercially available；It can also be customized to ultrasonic transducer producer.

Involved higher-order of oscillation electric signal transmission cable 3 is commercially available；It can also be customized to ultrasonic transducer producer.

Involved higher-order of oscillation electric signal generator market has the product close to needs commercially available；It can also determine to relevant manufacturers System.

Involved Micropump 7 can customize to specialized factory.

Its connected mode with various micro-fluidic chip of various Micropump is known.

The Micropump both can be the Micropump of external form；The Micropump can also do into or say the embedded micro-fluidic chip The Micropump of the built in version of internal its sample introduction end structure position or the sample introduction end Near-neighbor Structure position, its basic structure key element with it is outer The Micropump for putting form is identical.Micropump in legend is the Micropump of external form.

Claims (5)

1. the micro flow control chip device of the double mode coupling driving for hydrophobic base sheet matter, the structure of the device is including micro-fluidic Chip, the structure of the micro-fluidic chip include being bonded to each other the substrate and cover plate of installing together, its sample of the micro-fluidic chip Liquid stream sample introduction end and the terminal of the sample fluid flow are located remotely from each other, and the distance between the sample introduction end and the terminal are between 3 centimetres Between 10 centimetres, it is characterised in that its material of the substrate is dimethyl silicone polymer material, and its surface of the substrate is primary shape The surface of state, the surface of the primary form its be intended to refer to and do not change by any surface chemical modification or any surface chemistry Property the material primary form surface, the structure of the device also includes miniature ultrasonic transducer units, and, higher-order of oscillation electricity Signal transmission cable, one end and the miniature ultrasonic transducer units of the higher-order of oscillation electric signal transmission cable link together, should Miniature ultrasonic transducer units are installed in the position of the cover plate of the micro-fluidic chip or the neighbouring terminal of substrate with attaching；This is micro- Its major function of type ultrasonic transducer is in the actual sample introduction test of micro-fluidic chip, utilizes the sample introduction end and the end Difference in the distance between end and the miniature ultrasonic transducer units installation position difference and its ultrasonic intensity experienced Different, the difference between its interfacial tension of sample introduction end described in induced synthesis and the terminal its interfacial tension, the micro-fluidic chip should Interfacial tension difference between both ends can form pressure gap between the both ends of the micro-fluidic chip, and the pressure gap can drive Sample solution is moved to the end flow；It is soft and have the substrate of the dimethyl silicone polymer material of elasticity its function include with Its property to the strong absorption of ultrasonic wave, ultrasonic wave is absorbed strongly, and thereby the micro-fluidic chip terminal to should The rapid decrement of ultrasonic intensity is realized within limited short distance between sample introduction end；And Micropump, the Micropump and the sample introduction End connection, the Micropump is built-in Micropump or external Micropump；The function of the Micropump is to pump strength with the mechanicalness of the Micropump Support mutually come interfacial tension difference its caused driving force between the both ends of ultrasonic wave induction, adjust mutually Fit, be mutually coupled, the strength that one driving test liquid flows to the terminal direction flowing is pooled in a manner of Collaboration；Institute Cover plate and substrate its thickness are stated between 1.0 millimeters and 5.0 millimeters；And many silica dioxide granules, many Silica dioxide granule is filled in the pipeline of the micro-fluidic chip, and its tube chamber of the pipeline is by many silica dioxide granule institutes Fill up, for its particle size range of the silica dioxide granule between 10 microns and 200 microns, the silica dioxide granule is silica Its unorganic glass of shared percentage by weight more than 80% of crystalline particles, silica glass granule or silica composition Grain.

2. the micro flow control chip device of the double mode coupling driving according to claim 1 for hydrophobic base sheet matter, its It is characterised by, its material of the cover plate is dimethyl silicone polymer material.

3. the micro flow control chip device of the double mode coupling driving according to claim 1 for hydrophobic base sheet matter, its It is characterised by, its particle size range of the silica dioxide granule is between 100 microns and 200 microns, its inside diameter ranges of the pipeline Between 500 microns and 1000 microns.

4. the micro flow control chip device of the double mode coupling driving according to claim 1 for hydrophobic base sheet matter, its Be characterised by, the structure of the device also includes higher-order of oscillation electric signal generator, the higher-order of oscillation electric signal transmission cable its The other end is connected with the higher-order of oscillation electric signal generator.

5. the micro flow control chip device of the double mode coupling driving according to claim 1 for hydrophobic base sheet matter, its It is characterised by, for its specified ultrasonic wave transmission power of the miniature ultrasonic transducer units between 2 milliwatts and 9000 milliwatts, this is miniature The frequency of its ultrasonic wave operationally launched of ultrasonic transducer is between 100KHz and 12MHz.