CN100514037C - Electrochemical sensor for appraising ultraviolet shielding behaviour of nanometer oxide powder - Google Patents
Electrochemical sensor for appraising ultraviolet shielding behaviour of nanometer oxide powder Download PDFInfo
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- CN100514037C CN100514037C CNB2005100234448A CN200510023444A CN100514037C CN 100514037 C CN100514037 C CN 100514037C CN B2005100234448 A CNB2005100234448 A CN B2005100234448A CN 200510023444 A CN200510023444 A CN 200510023444A CN 100514037 C CN100514037 C CN 100514037C
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Abstract
An electrochemical transducer for evaluating ultraviolet shielding property of nanooxide powder consists of operation electrode, pair electrode, reference electrode, ultraviolet lamp, inlet tube, outlet tube quarts window, top cover, bottom cover and teflon film. It features that top cover, teflon film and bottom cover are connected together and teflon film has a long strip notch at film middle to form detection cell.
Description
Technical field
The present invention relates to a kind of electrochemical sensor of assessing the powder material of nano oxide uv-shielding capacity, belong to the nano-sensor technical field.
Background technology
Powder material of nano oxide has obtained broad research and Preliminary Applications because of it has unique physics, chemical property.Nano particles such as titania, zinc paste, silicon dioxide have strong absorption to the ultraviolet ray of 200nm-400nm wave band, be added in sunscreen products, coating and the yarn fabric, in order to shielding ultraviolet rays, prevent the damage of ultraviolet ray to human body, delay paint aging.Before select using the nano shielding agent, at first must be fast, economy, effectively its uv-shielding capacity is assessed.Chinese invention patent application " nano-powder material uv-shielding capacity appraisal procedure " (Chinese patent, number of patent application 03114952.9) and " a kind of method of assessing inorganic nanometer oxide powder uv-shielding capacity " (Chinese patent, number of patent application 200410052747.8) method of the uv-shielding capacity of assessment inorganic nano material is all disclosed.But above two patents only disclose the appraisal procedure of the uv-shielding capacity of inorganic nano material, and the sensor of the uv-shielding capacity of inorganic nano material assessment usefulness are not described.And the appraisal procedure of above two patent disclosures also exists jointly, and the sample consumption is big, the defective of complex operation.
Summary of the invention
The object of the present invention is to provide a kind of simple structure, technology simple, the cheap electrochemical sensor of very assessing the powder material of nano oxide uv-shielding capacity again effectively of assessed cost.
The electrochemical sensor of assessment inorganic nanometer oxide powder body material uv-shielding capacity of the present invention comprises working electrode, to electrode, contrast electrode, uviol lamp, induction pipe, outlet, quartz window, upper cover plate, lower cover and poly tetrafluoroethylene, wherein induction pipe and outlet place the both sides of upper cover plate respectively, contrast electrode places within the outlet, upper cover plate central authorities are inlaid with quartz window, uviol lamp places within the quartz window, poly tetrafluoroethylene places the centre of upper cover plate and lower cover, and the middle part has a strip breach to form detection cell, working electrode and electrode is installed in lower cover below, working electrode is for having modified nano-TiO
2The titanium electrode, and working electrode places quartz window below, contrast electrode is saturated calomel electrode or Ag/AgCl electrode, and upper cover plate, poly tetrafluoroethylene and lower cover are fixed, and they are fused.
The electrochemical sensor of assessment powder material of nano oxide uv-shielding capacity provided by the invention, it can be the various metal electrodes of doing electrode that are applicable to electrode, preferred titanium electrode,
The material require of upper cover plate and lower cover satisfies the powder material of nano oxide sample dispersion cording that detects for need has corrosion resistivity, preferably polytetrafluoroethylene plate of the present invention.In addition, upper cover plate, poly tetrafluoroethylene and lower cover need be fixed, and preferred screw of the present invention or rivet are fixed, and upper cover plate, poly tetrafluoroethylene and lower cover are fused.
The electrochemical sensor of assessment powder material of nano oxide uv-shielding capacity of the present invention is connected by the injector of microchannel with the flow injection instruments of sensor outside, working electrode, electrode is connected electroanalyzer with contrast electrode.Because the injector of flow injection instruments and electroanalyzer are conventional instrument, do not discuss in detail among the present invention.The principle of work of the electrochemical sensor of assessment powder material of nano oxide uv-shielding capacity of the present invention is: the nano-TiO of modifying on the working electrode
2Can produce light induced electron and hole under the irradiation of ultraviolet light, light induced electron and hole be migration round about under the effect of extra electric field, forms photocurrent, and when system one timing, the size of photocurrent depends on the power of ultraviolet light, ultraviolet light intensity, and photocurrent is big; A little less than the ultraviolet light, photocurrent is little.Open solution inlet port pipe and outlet, carrier fluid is with the certain flow rate detection cell of flowing through, startup and working electrode, the electroanalyzer that electrode is connected with contrast electrode, record background signal.Open uviol lamp, detect photo-signal, be injected into powder material of nano oxide-Na to be assessed
2SO
4During-aqueous dispersion, the conductively-closed of part ultraviolet light, light intensity decreasing, TiO
2The probability that electronics in the valence band is excited reduces, and photocurrent reduces.So just can reflect the variation of transmitted intensity, thereby realize assessment to the nano-oxide uv-shielding capacity by the variation of photocurrent.
The present invention has following advantage and effect:
1, because the assessment of uv-shielding capacity of the present invention is to realize in the shielding process of nano oxide powder to ultraviolet light, therefore this appraisal procedure is more reasonable than the method for surveying absorbance, and the means of direct screening are provided for the application of powder material of nano oxide in the ultraviolet protection industry.
2, because the working electrode that the present invention uses is directly to make by anodizing, and method is simple, technological requirement is low, and is cheap for manufacturing cost, easy to operate, guaranteed penetration and promotion of the present invention.
3, because the present invention has adopted the thin layer detection cell, required sample size is few when therefore detecting.
4, because principle of work of the present invention is the variation a little less than with ultraviolet light intensity of the size of photocurrent changes, so sensitivity and stability is improved, and can directly make assessment to the uv-shielding capacity of different nano oxide powders.
5, the present invention compares with the appraisal procedure based on absorbance, owing to need not to prepare a large amount of samples and can guarantee that powder suspension to be measured can stablize for a long time, therefore can assess the uv-shielding capacity of inorganic nanometer oxide powder body material fast, speed is fast, and analysis cost is low.
Description of drawings
Fig. 1 is the front elevation of the electrochemical sensor of assessment powder material of nano oxide uv-shielding capacity
Fig. 2 is the partition figure of the electrochemical sensor of assessment powder material of nano oxide uv-shielding capacity
Wherein each member is respectively: working electrode 1, to electrode 2, contrast electrode 3, uviol lamp 4, induction pipe 5, outlet 6, quartz window 7, upper cover plate 8, lower cover 9 and poly tetrafluoroethylene 10.
Embodiment
Discuss the course of work of the electrochemical sensor of assessment powder material of nano oxide uv-shielding capacity provided by the invention in detail below in conjunction with Figure of description:
Chemical sensor comprises working electrode 1, to electrode 2, contrast electrode 3, uviol lamp 4, induction pipe 5, outlet 6, quartz window 7, upper cover plate 8, lower cover 9 and poly tetrafluoroethylene 10 are formed, wherein induction pipe 5 and outlet 6 place the both sides of upper cover plate 8 respectively, contrast electrode places within the outlet 6, upper cover plate 8 central authorities are inlaid with quartz window 7, uviol lamp 4 places within the quartz window 7, poly tetrafluoroethylene 10 places the centre of upper cover plate 8 and lower cover 9, and the middle part has a strip breach to form detection cell, working electrode 1 and electrode 2 is installed in lower cover 9 belows, working electrode 1 is for having modified nano-TiO
2The titanium electrode, and working electrode 1 places quartz window 7 belows, contrast electrode 3 is saturated calomel electrode or Ag/AgCl electrode, and upper cover plate 8, poly tetrafluoroethylene 10 and lower cover 9 are fixed, and they are fused.
By microchannel, the induction pipe 5 of the electrochemical sensor of powder material of nano oxide uv-shielding capacity is connected with the injector of the flow injection instruments of sensor outside, outlet 6 is linked to each other with waste liquid pool.Working electrode 1, electrode 2 is connected with electroanalyzer with contrast electrode 3.Open solution inlet port pipe 5 and outlet 6, carrier fluid starts with working electrode 1, to the electroanalyzer that electrode 2 is connected with contrast electrode 3 with the certain flow rate detection cell of flowing through, and writes down background signal.After treating that background signal is stable, open uviol lamp 4, at this moment, 1 nano-TiO of modifying on the core titanium working electrode of sensor
2Can produce light induced electron and hole under the irradiation of ultraviolet light, light induced electron and hole be migration round about under the effect of extra electric field, produces photo-signal, and photocurrent can reach stable quickly.Draw certain amount of nano oxide-Na again
2SO
4-aqueous dispersion is injected into the injector sample introduction, treats nano-oxide-Na
2SO
4When-aqueous dispersion was flowed through detection cell, this system will mask a part with ultraviolet light before no show working electrode 1 end face, and ultraviolet light intensity weakens rapidly.Because system one is regularly, the size of photocurrent depends on the power of ultraviolet light, ultraviolet light intensity, and photocurrent is big; A little less than the ultraviolet light, photocurrent is little, so weakening rapidly of ultraviolet light intensity certainly will cause reducing rapidly of photocurrent.Certain amount of nano oxide-Na
2SO
4When-aqueous dispersion flowed out detection cell along with carrier fluid, ultraviolet light shone working electrode 1 end face with original light intensity again, and photocurrent increases to original size again fast.Reducing rapidly of photocurrent increases the photocurrent variations peak that just shows as certain altitude on signal record then again rapidly.In view of the above, just can realize the assessment of different nanometer oxide material uv-shielding capacities: the peak is high more, and screening ability is good more.
Claims (4)
1, a kind of electrochemical sensor of assessing the powder material of nano oxide uv-shielding capacity, it is characterized in that: comprise working electrode (1), to electrode (2), contrast electrode (3), uviol lamp (4), induction pipe (5), outlet (6), quartz window (7), upper cover plate (8), lower cover (9) and poly tetrafluoroethylene (10), wherein induction pipe (5) and outlet (6) place the both sides, upper end of upper cover plate (8) respectively, contrast electrode (3) places in the outlet (6), upper cover plate (8) central authorities are inlaid with quartz window (7), uviol lamp (4) places within the quartz window (7), poly tetrafluoroethylene (10) places the centre of upper cover plate (8) and lower cover (9), and the middle part of upper cover plate (8) has a breach to form detection cell, working electrode (1) and electrode (2) is installed in lower cover (8) below, working electrode (1) is for having modified nano-TiO
2The titanium electrode, and working electrode (1) places quartz window (7) below, to electrode (2) is the noncorroding metal electrode, contrast electrode (3) is saturated calomel electrode or Ag/AgCl electrode, upper cover plate (8) and lower cover (9) are corrosion-resistant plate, upper cover plate (8), poly tetrafluoroethylene (10) and lower cover (9) are fixed, and they are fused.
2, the electrochemical sensor of assessment powder material of nano oxide uv-shielding capacity as claimed in claim 1 is characterized in that: to electrode (2) is the titanium electrode.
3, the electrochemical sensor of assessment powder material of nano oxide uv-shielding capacity as claimed in claim 1 is characterized in that: upper cover plate (8) and lower cover (9) are polyfluortetraethylene plate.
4, as the electrochemical sensor of claim 1 or 2 described assessment powder material of nano oxide uv-shielding capacities, it is characterized in that: fix by screw or rivet between upper cover plate (8), poly tetrafluoroethylene (10) and lower cover (9) three.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100234448A CN100514037C (en) | 2005-01-19 | 2005-01-19 | Electrochemical sensor for appraising ultraviolet shielding behaviour of nanometer oxide powder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100234448A CN100514037C (en) | 2005-01-19 | 2005-01-19 | Electrochemical sensor for appraising ultraviolet shielding behaviour of nanometer oxide powder |
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| Publication Number | Publication Date |
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| CN1645116A CN1645116A (en) | 2005-07-27 |
| CN100514037C true CN100514037C (en) | 2009-07-15 |
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| CNB2005100234448A Expired - Fee Related CN100514037C (en) | 2005-01-19 | 2005-01-19 | Electrochemical sensor for appraising ultraviolet shielding behaviour of nanometer oxide powder |
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| CN105651739B (en) * | 2016-03-01 | 2019-01-08 | 浙江大学 | Contents of many kinds of heavy metal ion nanocomposite optical detection device and method based on Stripping Voltammetry |
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Granted publication date: 20090715 Termination date: 20120119 |