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Study on Stabilizing Cubic HfO2 Doped Y2O3 using Transmission Electron Microscopy 透射电镜下稳定立方HfO2掺杂Y2O3的研究
The Journal of Undergraduate Research at the University of Illinois at Chicago Pub Date : 2008-10-09 DOI: 10.5210/JUR.V2I1.7461
P. Gu, W. Walkosz, Guang Yang, R. Klie
{"title":"Study on Stabilizing Cubic HfO2 Doped Y2O3 using Transmission Electron Microscopy","authors":"P. Gu, W. Walkosz, Guang Yang, R. Klie","doi":"10.5210/JUR.V2I1.7461","DOIUrl":"https://doi.org/10.5210/JUR.V2I1.7461","url":null,"abstract":"Traditionally, the most common gate insulator used in transistors is Silicon Dioxide or SiO 2 ; however, as transistors are made smaller and smaller a breaking point has been reached such that SiO 2  no longer acts as an insulator. For this reason, in order to continue improving transistor density, a material or a combination of materials must replace or be added to SiO 2  as a gate insulator. HfO 2 seems to be a promising candidate due to its higher dielectric constant compared to Si 2  and large band gap. Furthermore, by doping this HfO 2  with Yttrium Oxide or Y 2 O 3 , the structural transformation from the monoclinic to the cubic phase is possible, consequently maintaining a higher dielectric constant. Several different samples of HfO 2  with varying concentrations of Y 2 O 3  were studied using a Transmission Electron Microscope (TEM) in order to analyze the structure alterations at various temperatures.","PeriodicalId":426348,"journal":{"name":"The Journal of Undergraduate Research at the University of Illinois at Chicago","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128673082","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nonthermal Plasma-Assisted Synthesis of Molybdenum Carbide Thin Film Catalysts 非热等离子体辅助合成碳化钼薄膜催化剂
The Journal of Undergraduate Research at the University of Illinois at Chicago Pub Date : 2007-12-07 DOI: 10.5210/JUR.V1I1.7447
G. Campbell, K. Nelson, C. L. Heitzman, K. Brezinsky, A. Saveliev
{"title":"Nonthermal Plasma-Assisted Synthesis of Molybdenum Carbide Thin Film Catalysts","authors":"G. Campbell, K. Nelson, C. L. Heitzman, K. Brezinsky, A. Saveliev","doi":"10.5210/JUR.V1I1.7447","DOIUrl":"https://doi.org/10.5210/JUR.V1I1.7447","url":null,"abstract":"Optimization of the nonthermal plasma-assisted method of synthesizing molybdenum carbide thin films on molybdenum particle substrates was initiated using a previously existing experimental setup. The yield of the apparatus used has increased by 20% as the result of redesign. The molybdenum carbide produced through nonthermal plasma has been characterized by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). It is tentatively observed by using the TEM that an ethylene concentration of 3% gives the best molybdenum carbide surface layer. The quality of the product is unclear, indicating that further characterization is necessary. This novel method of catalyst production has been tested in very preliminary experiments with a water-gas shift reactor and the CO 2  conversion was 0.5%, suggesting, again, that further optimization is necessary.","PeriodicalId":426348,"journal":{"name":"The Journal of Undergraduate Research at the University of Illinois at Chicago","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129507788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Development and Testing of a Multi-Depth Microwire Electrode Array 多深度微线电极阵列的研制与测试
The Journal of Undergraduate Research at the University of Illinois at Chicago Pub Date : 2007-12-01 DOI: 10.5210/JUR.V1I1.7453
V. Nekrasov, P. Rousche
{"title":"The Development and Testing of a Multi-Depth Microwire Electrode Array","authors":"V. Nekrasov, P. Rousche","doi":"10.5210/JUR.V1I1.7453","DOIUrl":"https://doi.org/10.5210/JUR.V1I1.7453","url":null,"abstract":"We describe a method by which a single shaft multi-microwire electrode can be easily and efficiently fabricated. The constructed electrode can then be used for multi-depth neuronal unit recording from one or more tracks in deep brain structures of anesthetized or awake animals. The electrode consists of multiple strands of 50 μm Teflon insulated tungsten microwires threaded through a 25 gauge stainless steel cannula. The individual microwires are then cut to specified offsets, depending on which layers the researcher is interested in. In this case the three wires present are cut to 1 mm, 600 μm, and 250 μm from the tip of the distal end of the cannula. These distances correspond to the II, III, and V layer of the rat sensorimotor cortex. At the base of the electrode, the wires are soldered to individual pins of a miniature connector that plugs into preamplifier that is part of a TDT (Tucker-Davis Technologies) modular signal processing system. Although in vivo data has yet to be attained and analyzed for this type of an electrode, EIS (Electrochemical Impedance Spectroscopy) analysis has shown that the electrode design is well suited for brain tissue recordings.","PeriodicalId":426348,"journal":{"name":"The Journal of Undergraduate Research at the University of Illinois at Chicago","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117197573","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electrospinning: A study in the formation of nanofibers 静电纺丝:纳米纤维形成的研究
The Journal of Undergraduate Research at the University of Illinois at Chicago Pub Date : 2007-12-01 DOI: 10.5210/JUR.V1I1.7444
J. Vonch, A. Yarin, C. Megaridis
{"title":"Electrospinning: A study in the formation of nanofibers","authors":"J. Vonch, A. Yarin, C. Megaridis","doi":"10.5210/JUR.V1I1.7444","DOIUrl":"https://doi.org/10.5210/JUR.V1I1.7444","url":null,"abstract":"Electrospinning is a technique to produce nanofibers more efficiently. In electrospinning, electricity spins fibers by extracting the polymer from the solvent and stretching it, all in one continuous electric field. Basics of electrospinning are discussed in sequence from simple homogenous fibers through a single nozzle to heterogeneous core-shell fibers from double, concentric nozzles. Experimental set-up is described and the effect of different variables in the process of electrospinning on nanofiber quality is illustrated. Formation of carbon nanotube fibers with porous walls from polyethylene oxide/polyacrylnitrile (PEO/PAN) core-shell fibers is the definitive objective. Zipped LaTex file","PeriodicalId":426348,"journal":{"name":"The Journal of Undergraduate Research at the University of Illinois at Chicago","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127790203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 18
Intercalation of Poly-acrylonitrile (PAN) into carbon nanotubes 聚丙烯腈(PAN)嵌入碳纳米管的研究
The Journal of Undergraduate Research at the University of Illinois at Chicago Pub Date : 2007-12-01 DOI: 10.5210/JUR.V1I1.7452
V. Chan, K. Sun, A. Yarin, C. Megaridis
{"title":"Intercalation of Poly-acrylonitrile (PAN) into carbon nanotubes","authors":"V. Chan, K. Sun, A. Yarin, C. Megaridis","doi":"10.5210/JUR.V1I1.7452","DOIUrl":"https://doi.org/10.5210/JUR.V1I1.7452","url":null,"abstract":"The primary goal of this work is to fill 200 nm average diameter CVD Carbon nanotubes (CNTs) with Poly-acrylonitrile (PAN) - a carbonizable polymer - with the diffusion process reported by Bazilevsky  et al.  and to control the thickness and structure of the PAN inside the CNTs. Transmission electron microscope (TEM) was used as a tool to monitor the morphology of polymer filled nanotubes. TEM images of CNTs that were filled using five different PAN concentrations of the PAN/DMF solution - 0.1, 0.5, 1, 2, and 5 wt% - demonstrated that the intercalation process is independent of the initial PAN concentration in solution. Furthermore, a DMF rinse process was used to remove polymer that was clinging to the outer walls of the CNTs, allowing clearer visual of the PAN structure in the interior of the CNTs. Finally, TEM images of filled CNTs taken through a carbonization process demonstrated that the CNT samples were able to survive the high temperature, with some damage to the CNT walls.","PeriodicalId":426348,"journal":{"name":"The Journal of Undergraduate Research at the University of Illinois at Chicago","volume":"286 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116111779","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Binding Analysis of a Novel Peptide to Plasmodium falciparum Knob-Associated Histidine Rich Protein (KAHRP) 一种新型肽与恶性疟原虫旋钮相关组氨酸富蛋白(KAHRP)的结合分析
The Journal of Undergraduate Research at the University of Illinois at Chicago Pub Date : 2007-12-01 DOI: 10.5210/JUR.V1I1.7454
J. Preston, Lixiao Zeng, C. Takoudis, Xuerong Li, A. Chishti
{"title":"Binding Analysis of a Novel Peptide to Plasmodium falciparum Knob-Associated Histidine Rich Protein (KAHRP)","authors":"J. Preston, Lixiao Zeng, C. Takoudis, Xuerong Li, A. Chishti","doi":"10.5210/JUR.V1I1.7454","DOIUrl":"https://doi.org/10.5210/JUR.V1I1.7454","url":null,"abstract":"Knob-associated histidine rich protein (KAHRP) is secreted by  Plasmodium falciparum  in infected red blood cells. This protein is required for the production of surface protrusions called knobs, which have been shown to be crucial for the adherence of  P. falciparum -infected erythrocytes ( Pf -IRBC) to the endothelia of small blood vessels. KP-AP, a 10-amino acid (AA) peptide (FITRANDTSK), binds specifically with KAHRP in preliminary studies. KP-AP is expected to disrupt knob formation and prohibit adherence of  Pf -IRBC to blood vessels and greatly reduce the pathogenicity of the parasite. This paper describes an investigation into the binding interaction between biotinylated KP-AP (Biotin-AP) and a segment of KAHRP. ELISA and the real-time bio-interaction optical sensor, BIAcore are the methods of detection. The specific binding was confirmed with ELISA and the KD value was estimated to be 1.2 μM. Binding was not detected with BIAcore, most likely due to the reduced flexibility of Biotin-AP while immobilized on the sensor chip.","PeriodicalId":426348,"journal":{"name":"The Journal of Undergraduate Research at the University of Illinois at Chicago","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125250453","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Optimization of Surface Preparation and Surface Passivation for GaSb Infrared Photodetectors GaSb红外探测器表面制备及表面钝化的优化
The Journal of Undergraduate Research at the University of Illinois at Chicago Pub Date : 2007-12-01 DOI: 10.5210/JUR.V1I1.7456
G. Hearn, K. Banerjee, S. Mallick, Siddhartha Ghosh
{"title":"Optimization of Surface Preparation and Surface Passivation for GaSb Infrared Photodetectors","authors":"G. Hearn, K. Banerjee, S. Mallick, Siddhartha Ghosh","doi":"10.5210/JUR.V1I1.7456","DOIUrl":"https://doi.org/10.5210/JUR.V1I1.7456","url":null,"abstract":"GaSb can be used as an efficient mid-wavelength infrared photodetector, so its improvement is an important field of study. The passivation of GaSb is not as effective as passivation of other semiconductors. We report on the use of surface treatments of Buffered Oxide Etch (BOE) and ammonium sulfide, and their effect on the quality of ZnS passivation. These treatments are compared using Capacitance-Voltage measurement of metal-insulator-semiconductors structures made from the treated GaSb.","PeriodicalId":426348,"journal":{"name":"The Journal of Undergraduate Research at the University of Illinois at Chicago","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121652462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Biocompatibility of polyimide-based neural interfaces for chronic implant applications 聚酰亚胺神经接口在慢性植入物应用中的生物相容性
The Journal of Undergraduate Research at the University of Illinois at Chicago Pub Date : 2007-12-01 DOI: 10.5210/JUR.V1I1.7449
S. Watkins, D. Gandhi, P. Rousche
{"title":"Biocompatibility of polyimide-based neural interfaces for chronic implant applications","authors":"S. Watkins, D. Gandhi, P. Rousche","doi":"10.5210/JUR.V1I1.7449","DOIUrl":"https://doi.org/10.5210/JUR.V1I1.7449","url":null,"abstract":"Neural interfaces provide functional re-establishment of the central nervous system, as well as accessibility to monitor physiological responses at a cellular and molecular level. An ideal device is electrically, mechanically, and biologically compatible in long-term applications. Reducing the foreign body response and scar tissue formation caused by the surrounding tissue of the implant makes the device most biocompatible, while not hindering the electrical interface of the device. Technological advances in polymer materials are leading to improved designs of neural implants with the utilization of flexible polyimide, which decreases the relative micromotion strain. However, the flexibility of polyimide causes the device to buckle during insertion; therefore a biodegradable polymer, polyglycolic acid (PGA), is added to the polyimide device in order to temporarily enhance the structural rigidity. In this study we detail the successful biocompatibility demonstrated with both uncoated and PGA coated polyimide devices to provide new design strategies for neural implants used in chronic applications.","PeriodicalId":426348,"journal":{"name":"The Journal of Undergraduate Research at the University of Illinois at Chicago","volume":"238 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114609623","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Study of Au-CeO2 Nano-particles using analytical Transmission Electron Microscopy Au-CeO2纳米粒子的透射电镜分析研究
The Journal of Undergraduate Research at the University of Illinois at Chicago Pub Date : 2007-12-01 DOI: 10.5210/JUR.V1I1.7445
P. Gu, G. Yang, R. Klie
{"title":"Study of Au-CeO2 Nano-particles using analytical Transmission Electron Microscopy","authors":"P. Gu, G. Yang, R. Klie","doi":"10.5210/JUR.V1I1.7445","DOIUrl":"https://doi.org/10.5210/JUR.V1I1.7445","url":null,"abstract":"Cerium oxide doped with various rare earth metals is often used as a support for nano-sized gold particles, and demonstrates to be a promising catalyst for the water gas shift reaction at low temperatures. Many factors are hypothesized to affect the activity of this heterogeneous catalyst, including its loading with gold, the rare-earth dopant, the support and Au particle size, and leaching of the sample. In this study, we examined several Au/CeO 2 -based catalyst samples, including 2.4% Au/(Ce,Gd)O 2 , 1.8% Au/(Ce,La)O 2  leached, 0.5% Au/(Ce,Gd)O 2  leached, and 0.75% Au/CeO 2  utilizing analytical transmission electron microscopy. The effects of Au and rare-earth doping on the ceria lattice parameter were investigated, and it was determined that there are no significant variations in the particle's structure or lattice-spacing. Furthermore, the particle sizes of each of the four samples were investigated concluding that although the 1.8% Au/(Ce,La)O 2  leached sample has a slightly larger particle size, and the 2.4% Au/(Ce,Gd)O 2  sample has a slightly smaller particle size, the differentiation is not adequate to be accountable for the radical distinction in catalytic activity.","PeriodicalId":426348,"journal":{"name":"The Journal of Undergraduate Research at the University of Illinois at Chicago","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125749914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Design and Development of High Performance Vacuum Insulation Panels (VIP) with Kevlar Thread Support 凯夫拉螺纹支撑的高性能真空隔热板的设计与开发
The Journal of Undergraduate Research at the University of Illinois at Chicago Pub Date : 2007-12-01 DOI: 10.5210/JUR.V1I1.7450
V. Sood, A. Feinerman
{"title":"Design and Development of High Performance Vacuum Insulation Panels (VIP) with Kevlar Thread Support","authors":"V. Sood, A. Feinerman","doi":"10.5210/JUR.V1I1.7450","DOIUrl":"https://doi.org/10.5210/JUR.V1I1.7450","url":null,"abstract":"Vacuum insulation is an advanced thermal insulation technology that significantly outperforms conventional materials, such as foam or fiber. The study of this new technology is the first step towards making improvements in the applications of insulation panels to provide energy-efficient and cost saving solutions. The focus this summer has been on creating prototypes using acrylic and Kevlar thread to further improve the quality of insulation panels and make them more efficient. Using a carbon dioxide laser system, acrylic was cut and small prototypes were produced. The insulation panel was sealed in a plastic bag and a small vacuum pump was used to evacuate the air. The results gathered during the research program indicate that Kevlar thread is strong and can provide support without breaking, making the insulation panel effective. Stronger conclusions will arise after further testing and research in this area.","PeriodicalId":426348,"journal":{"name":"The Journal of Undergraduate Research at the University of Illinois at Chicago","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132551723","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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