PP andPoster Session, Thursday, June 17Theme F686 - N1123Electrok<strong>in</strong>etic Flow Model<strong>in</strong>g <strong>in</strong> a Porous Nanochannel us<strong>in</strong>g Curvil<strong>in</strong>ear Coord<strong>in</strong>ates111UMehdi MostofiUP P*, Davood D. GanjiP Mofid Gorji-BandpyP1PDepartment of Mechanical Eng<strong>in</strong>eer<strong>in</strong>g, Noshiravani University of Technology, Babol, IranAbstract- In this Paper, it is expected to model the behavior of the electrok<strong>in</strong>etics driven fluid <strong>in</strong> porous nanochannel. <strong>in</strong> this case, cont<strong>in</strong>uumtheory is no longer valid. As a result, it is necessary to model the Poisson-Boltzmann and Navier-Stokes us<strong>in</strong>g molecular simulation. Incont<strong>in</strong>ue, for four typical nano-scale particles, porous media assumption is made and validity of the cont<strong>in</strong>uum theory <strong>in</strong> nano-scale is<strong>in</strong>vestigated.One of the most important subsystems of the micro- andnano- fluidic devices is their passage or “Micro- and Nano-Channel”. Nano-channel term is referred to channels withhydraulic diameter less than 100 nanometers [1]. Bydecrease <strong>in</strong> size and hydraulic diameter some of the physicalparameters such as surface tension will be more significantwhile they are negligible <strong>in</strong> normal sizes.Concentrat<strong>in</strong>g surface loads <strong>in</strong> liquid – solid <strong>in</strong>terface makesthe EDL to be existed. If the loads are concentrated <strong>in</strong> theend of nano-channels, a potential difference will begenerated that forces the ions <strong>in</strong> the nano-channel. However,<strong>in</strong>duced electric field is discharged by electric conduction ofthe electrolyte.Rice and Whitehead [2], Lu and Chan [3] and Ke and Liu[4] studied the flow <strong>in</strong> capillary tube. None of them solvedthe problem based on the curvil<strong>in</strong>ear coord<strong>in</strong>ates system.Also, all of them studied the problem with existence of thepressure gradient while <strong>in</strong> the modern applications, thepressure gradient can be elim<strong>in</strong>ated and consequently,solv<strong>in</strong>g the problem consider<strong>in</strong>g this fact is necessary. In thispaper, for small zeta potentials without pressure gradientwill be studied based on the curvil<strong>in</strong>ear coord<strong>in</strong>ates <strong>in</strong> acapillary tube.In case of electrok<strong>in</strong>etic flows <strong>in</strong> porous media, references[5] – [7] can be mentioned <strong>in</strong> order to have some reviewabout it. In this work, a nano-tube with 15 nm radius will be<strong>in</strong>vestigated. Despite most of the works were done, <strong>in</strong> thiswork, curvil<strong>in</strong>ear coord<strong>in</strong>ates will be employed.Based on [8], <strong>in</strong> nano-scale, we should aware of thecompatibility of traditional theories that are used <strong>in</strong> greaterscales. On the other hand, <strong>in</strong> nano-scale, there areexperimentally proved limitations that, traditional theoriesTable 1. (a) Effect of four typical particle diameters on zetapotential <strong>in</strong> a 15 nm radius nano-tubeNormalizes ZetaRadius (nm)Potential for Particles1 0.062 0.224 0.568 0.84are no longer valid. In this paper, it is tried to trespass thoseborders and as a result, molecular simulation has beenemployed and the nano-tube is assumed to be porous. In thiscase, Poisson-Boltzmann equation must be solved [8].In simulation phase of the work, first of all, analyticaltreatment has been employed <strong>in</strong> order to have non-porousmedia results. Figure (a) shows the result <strong>in</strong> this case. Afterthat, some specific particle diameters have been <strong>in</strong>vestigated<strong>in</strong> order to have achievements about the particle diametereffect on the zeta potential <strong>in</strong> nano-tube. In this paper,diameters of 1, 2, 4 and 8 nm are <strong>in</strong>vestigated. Table (a)shows the results of these four simulations. As thesimulation mentions, the greater the particle, the moresignificant the zeta potential. The zeta potential have beengiven <strong>in</strong> Table (a) are normalized by the wall zeta potential<strong>in</strong> a non-porous similar nano-tube.In summary, by consider<strong>in</strong>g curvil<strong>in</strong>ear coord<strong>in</strong>ates andapply<strong>in</strong>g it on a nano-tube, no porous media is <strong>in</strong>vestigated.Then, for some specific nano-scale particle diameters,simulation has been applied. In the case of particles, forgreater particles <strong>in</strong> comparison of the tube diameter,significant effects of particles have been occurred and as aresult, cont<strong>in</strong>uum mechanics are no longer valid. However,for smaller particles, it has been shown that, cont<strong>in</strong>uummechanics are valid at least for diffusion layer. Thisachievements are <strong>in</strong> good agreements with experimentalresults <strong>in</strong> [8].* Correspond<strong>in</strong>g author: mehdi_mostofi@yahoo.comFigure 1. (a) Normalized distribution of potential as a function ofnormalized radius <strong>in</strong> a non-porous nano-tube with 30 nm diameter.[1] S. Kandlikar, et. al, Heat Transfer and Fluid Flow <strong>in</strong>M<strong>in</strong>ichannels and Microchannels. Elsevier Limited, Oxford (2006).[2] Rice, C.L. and Whitehead, R. J. Phys. Chem., 69(11), 4017–4023 (1965)[3] W.Y. Lo, and K. Chan. J. Chem. Phys., 143, 339–353 (1994)[4] H. Keh, and Y.C. Liu, J. Colloids and Interface Surfaces, 172,222–229 (1995)[5] Coelho, D. et. al. J. Colloid Interface Sci. 181, 169 (1996).[6] Coelho, D. et. al. Fractals, 5, 507 (1997).[7] Mar<strong>in</strong>o, S. et. al. J. Colloid Interface Sci. 223, 292 (2000).[8] G. Karniadakis, et. al. Microflows and Nanoflows. Spr<strong>in</strong>ger(2005).6th Nanoscience and Nanotechnology Conference, zmir, 2010 695
PPPoster Session, Thursday, June 17Theme F686 - N11232Vole Repeller Spider Robot with Artificial Muscle12UKadir SabancUP P*, Cevat AydnP1PSelcuk University Doganhisar Vocational School, Konya, TurkeyPSelcuk University Faculty of Agriculture, Agricultural Mach<strong>in</strong>ery Department, Konya, TurkeyAbstract-In this study, an example of us<strong>in</strong>g nitonel which is an alloy with shape memory at the robotic field. Nitonel material that is commonlyused <strong>in</strong> today movement technology, don’t pollute the environment, quiet operat<strong>in</strong>g, economic, easy controlled has been used as artificial muscle atthe robot. It is aimed to remove the rat that gives harm to crop at the field through design<strong>in</strong>g an amplificatory and a sonant signal 25- 35 KHzamp on this robot.Today, us<strong>in</strong>g alloys with shape memory is generalized fast<strong>in</strong>to many technological areas. Alloys with shape memory isused various fields from temperature sensors at electronic toblood pressure test valves at the medic<strong>in</strong>e, from automotiveradiator fans to robots with multi leg at the robotic [1, 2].When robot movement systems are generally exam<strong>in</strong>ed, it isseen that hydraulic, pneumatic, electric motor systems that arecalled as traditional robot accelerator mechanisms are the mostcommon systems [3].In recent years, various studies have been achieved aboutwork<strong>in</strong>g pr<strong>in</strong>ciples, characteristics and application of nitonolwires at the robotic areas. Nit<strong>in</strong>ol wires are used as artificialmuscle at multi leg and reptile robots [4,5,6].The work<strong>in</strong>g block diagram of vole repeller spider robotwith artificial muscle used <strong>in</strong> this study is shown <strong>in</strong> Figure 1and 2.Figure 1. Spider robot top viewFigure 2. Block diagram of systemThe Vole has an important place among the pests that areaccepted as general plant pests of culture plants. The vole isharmful for every k<strong>in</strong>d of plant as field plants; wheat, barley,rye, oats, pulses, and <strong>in</strong>dustry and oil seeds, fruits vegetablegarden plants, meadow, young forest. They are active at daytime and night time especially at night time. They gives harmto crops through cutt<strong>in</strong>g, corrod<strong>in</strong>g, eat<strong>in</strong>g and pollut<strong>in</strong>g theamount at least tenfold section more than their eat<strong>in</strong>g section.The agricultural medic<strong>in</strong>e has an important place to preventdisease, crop loss due to harmful and foreign plants. But theagricultural pest control with chemicals should be appliedsensitively, carefully and with m<strong>in</strong>imum medic<strong>in</strong>e lossbecause those medic<strong>in</strong>es has negative effects on human health,environment and natural balance and <strong>in</strong>creas<strong>in</strong>g produc<strong>in</strong>gcosts [7].Various methods are used to struggle aga<strong>in</strong>st to mouse andrat. Chemical methods are commonly used one. Poisonousfeed are mostly used at chemical applications. It has been seenthat many birds died because of eat<strong>in</strong>g poisonous wheat thatare used at vole struggle because those wheat are not placeswell <strong>in</strong> to the holes and left on open area. Also poison<strong>in</strong>g isseen at the children of families who are deal with agriculturebecause of contact or eaten those rat feed by the children.Ultrasonic rat repeller robot can be used at supplementary ofother methods. It is used at the area which is isolated fromvoles and <strong>in</strong>vasion of vole aga<strong>in</strong> this isolated area isprevented. The rats/vole is very sensitive aga<strong>in</strong>st to voice.Even a simple noise disturbs them. The po<strong>in</strong>t to take <strong>in</strong>toconsideration is to produce the noise which only disturbs thevole not human. The rodent k<strong>in</strong>ds can hear up to 80 kHzfrequencies noises. However human ear can hear only 20Hz-20 Khz frequencies noises. In this study, the circuit on therobot will give 25-40 kHz frequency range so it is though thatthe vole will be dismissed from agriculture field. Also therobot won’t harm to the products at the land because it is lightnot heavy. Seperately spider robot doesn’t harm the crop <strong>in</strong> thefield because it is so light. Because of not us<strong>in</strong>g harmful toxicfor destroy<strong>in</strong>g mice and nature, natural balance will beprotected. Nit<strong>in</strong>ol materials, gett<strong>in</strong>g widespread <strong>in</strong> ourcountry, are used <strong>in</strong> a robotic field.*Correspond<strong>in</strong>g author: ksabanci@selcuk.edu.tr[1] Dilibal S., Sönmez N., Dilibal H., “Ni-Ti ekil Bellekli Alamlarve Teknolojik Kullanm Alanlar”, 3. Uluslar aras leri TeknolojilerSempozyumu, 2003[2] Dilibal S., Dilibal H., “Ituhand Robot El ve Mayn TemizlemeAlannda Kullanlabilirlii”, Savunma Teknolojileri Kongresi, 2002[3] Dilibal S., Güner E.,Akturk N., "Three-f<strong>in</strong>ger SMA Robot Handand ts Practical Analysis", Robotica, 20,175-180, 2002[4] Topba E., Akku N., “ekil Hafzal Alamlar ve EndüstriyelUygulamalar”, Mak<strong>in</strong>e Teknolojiler Elektronik Dergisi, Cilt 4 sayfa15-22,2007[5]Liu C.Y., Liao W.H. “A Snake Robot Us<strong>in</strong>g Shape MemoryAlloys” , International Conference On Robotics And Biomimetics,,August 22-26,2004, Shenyang, Ch<strong>in</strong>a[6] Raparelli T, Zobel P. B. and Durante F., "A Robot Actuated byShape Memory Alloy Wires,", Proc. Of International Symposium onIndustrial Electronics, Vol. 2, pp.420-423, 2002.[7]Dursun, E., 2000. Meme Anmasnn PülverizasyonKarakteristikler<strong>in</strong>e Etkileri. Ek<strong>in</strong> Dergisi Yl : 6, Say 21.[8]Sabanc K., ”Yapay Kas Kullanlarak Örümcek Robot Tasarm”,Yüksek Lisans Tezi, Selçuk Üniversitesi Fen BilimleriEnstitüsü,Konya,2005.6th Nanoscience and Nanotechnology Conference, zmir, 2010 696
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