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Doping Plasmon-Enhanced Tio2 With Zirconia To Improve Solar Energy Harvesting In Dye-Sensitized Solar Cells, Anastasia Pasche 2015 The University of Western Ontario

Doping Plasmon-Enhanced Tio2 With Zirconia To Improve Solar Energy Harvesting In Dye-Sensitized Solar Cells, Anastasia Pasche

Electronic Thesis and Dissertation Repository

Solar energy is a promising solution towards meeting the world’s ever-growing energy demand. Dye-sensitized solar cells (DSSCs) are hybrid organic-inorganic solar cells with potential for commercial application, but are plagued by inefficiency due to their poor sunlight absorption. Silver nanoparticles have been shown to enhance the absorptive properties of DSSCs, but their plasmonic resonance causes local hot spots, resulting in cell deterioration. This thesis studies the mitigation of thermal energy loss of plasmon-enhanced DSSCs by the co-incorporation of zirconia, a well-known thermostabilizer, into the cell’s photoactive material. TiO2 was also synthesized using green bio-sourced solvents in supercritical CO2 ...


Synthesis And Characterizations Of Stimuli-Responsive Polymeric Materials For Biomedical Applications, Shuangcheng Tang 2015 University of Tennessee - Knoxville

Synthesis And Characterizations Of Stimuli-Responsive Polymeric Materials For Biomedical Applications, Shuangcheng Tang

Doctoral Dissertations

Stimuli-responsive polymeric materials have been now widely researched toward the biomedical applications including therapeutic delivery, bio-sensor surface modification, and tissue-engineering, etc., considering their desirable biocompatibility, tunable properties, and sensitivity toward physiological stimuli. Beyond the monoresponsive materials, polymers with responsiveness simultaneously toward multiple stimuli are paid great attention to because the control of responsive behaviors could be achieved at a more accurately and delicately level in a complex local environment. However, many challenges still exist such as maintaining integrity of the structure, shaping the morphology at micro- and macro-scale, and regulating a controllable and predictable transition behavior.

The objectives of this ...


Placenta-On-A-Chip: Developing An In-Vitro Platform To Mimic Substance Transport, Catherine Meis 2015 Iowa State University

Placenta-On-A-Chip: Developing An In-Vitro Platform To Mimic Substance Transport, Catherine Meis

Honors Projects and Posters

Organ-on-a-chip technology utilizes microfluidics to create an environment for cell culture that represents basic organ function. These dynamic cell culture models are promising tools for improving drug testing methods and investigating how cells respond to a variety of stimuli. At the time of the project inception, no published work was available on applying organ-on-a-chip technology to develop an in-vitro model for the placenta, an important organ. The placenta’s main function is to transport nutrients, waste and other substances between the mother and developing fetus. A microfluidic platform to replicate the placental barrier was designed based on studying other organ-on-a-chip ...


Devices For Application And Load Bearing And Method Of Using The Same, Alfred J. Crosby, Michael D. Bartlett, Duncan J. Irschick, Daniel R. King 2015 University of Massachusetts - Amherst

Devices For Application And Load Bearing And Method Of Using The Same, Alfred J. Crosby, Michael D. Bartlett, Duncan J. Irschick, Daniel R. King

Michael Bartlett

Gecko-like adhesive application devices suited for dynamic applications are disclosed, where the device can be easily applied to target substrates, exhibiting a firm hold, and subsequently released therefrom. Gecko-like adhesive application devices that are suited for sustained holding after easy application (e.g., on vertical or inclined surfaces or ceiling) also are disclosed.


Beyond Cervical Length: A Pilot Study Of Ultrasonic Attenuation For Early Detection Of Preterm Birth Risk, Barbara L. McFarlin, Viksit Kumar, Timothy A. Bigelow, Douglas G. Simpson, Rosemary C. White-Traut, Jacques S. Abramowicz, William D. O'Brien Jr. 2015 University of Illinois at Chicago

Beyond Cervical Length: A Pilot Study Of Ultrasonic Attenuation For Early Detection Of Preterm Birth Risk, Barbara L. Mcfarlin, Viksit Kumar, Timothy A. Bigelow, Douglas G. Simpson, Rosemary C. White-Traut, Jacques S. Abramowicz, William D. O'Brien Jr.

Electrical and Computer Engineering Publications

The purpose of this study was to determine whether cervical ultrasonic attenuation could identify women at risk of spontaneous preterm birth. During pregnancy, women (n = 67) underwent from one to five transvaginal ultrasonic examinations to estimate cervical ultrasonic attenuation and cervical length. Ultrasonic data were obtained with a Zonare ultrasound system with a 5- to 9-MHz endovaginal transducer and processed offline. Cervical ultrasonic attenuation was lower at 17–21 wk of gestation in the SPTB group (1.02 dB/cm-MHz) than in the full-term birth groups (1.34 dB/cm-MHz) (p = 0.04). Cervical length was shorter (3.16 cm ...


Incorporation Of Fibrin Into A Collagen–Glycosaminoglycan Matrix Results In A Scaffold With Improved Mechanical Properties And Enhanced Capacity To Resist Cell-Mediated Contraction, Claire Brougham, Tanya J. Levingstone, Stefan Jockenhoevel, Thomas C. Flanagan, Fergal J. O'Brien 2015 Dublin Institute of Technology

Incorporation Of Fibrin Into A Collagen–Glycosaminoglycan Matrix Results In A Scaffold With Improved Mechanical Properties And Enhanced Capacity To Resist Cell-Mediated Contraction, Claire Brougham, Tanya J. Levingstone, Stefan Jockenhoevel, Thomas C. Flanagan, Fergal J. O'Brien

Articles

Fibrin has many uses as a tissue engineering scaffold, however many in vivo studies have shown a reduction in function resulting from the susceptibility of fibrin to cell-mediated contraction. The overall aim of the present study was to develop and characterise a reinforced natural scaffold using fibrin, collagen and glycosaminoglycan (FCG), and to examine the cell-mediated contraction of this scaffold in comparison to fibrin gels. Through the use of an injection loading technique, a homogenous FCG scaffold was developed. Mechanical testing showed a sixfold increase in compressive modulus and a thirtyfold increase in tensile modulus of fibrin when reinforced with ...


Characterization Of Antimicrobial Susceptibility Profile Of Biofield Treated Multidrug-Resistant Klebsiella Oxytoca, Mahendra Kumar Trivedi, Alice Branton, Dahryn Trivedi, Harish Shettigar, Mayank Gangwar, Snehasis Jana 2015 Trivedi Global Inc.

Characterization Of Antimicrobial Susceptibility Profile Of Biofield Treated Multidrug-Resistant Klebsiella Oxytoca, Mahendra Kumar Trivedi, Alice Branton, Dahryn Trivedi, Harish Shettigar, Mayank Gangwar, Snehasis Jana

Mahendra Kumar Trivedi

Klebsiella are opportunistic pathogens that cause a wide spectrum of severe diseases. The aim of the present study was to investigate the impact of biofield treatment on multidrug resistant strain of K. oxytoca with respect to antibiogram pattern along with biochemical study and biotype number. Clinical lab isolate of K. oxytoca was divided into two groups i.e. control and treated. Control group remain untreated and treated group was subjected to Mr. Trivedi’s biofield. The analysis was done on day 10 after biofield treatment and compared with control group. Control and treated groups were analyzed for antimicrobial susceptibility pattern ...


Application Of 3d Printing Technology In Porous Anode Fabrication For Enhanced Power Output Of Microbial Fuel Cells, Bin Bian 2015 The University of Western Ontario

Application Of 3d Printing Technology In Porous Anode Fabrication For Enhanced Power Output Of Microbial Fuel Cells, Bin Bian

Electronic Thesis and Dissertation Repository

Microbial fuel cells (MFCs) are widely researched for application in wastewater treatment. However, the current anodes used in MFCs often suffer from high fabrication cost and uncontrollable pore sizes. In this thesis, three-dimensional printing technique was utilized to fabricate anodes with different micro pore sizes for MFCs. Copper coating and carbonization were applied to the printed polymer anodes to increase the conductivity and specific surface area. Voltages of MFCs with various anodes were measured as well as other electrochemical tests such as linear sweep voltammetry and electrochemical impedance spectroscopy. 3D copper porous anode produced higher maximum voltages and power densities ...


Electron Microscopic Observations Of Interfacial Voids In Aluminum Created By Alkaline Dissolution, Saikat Adhikari, L. Scott Chumbley, H. Chen, Y. C. Jean, A. C. Geiculescu, Kurt R. Hebert 2015 Iowa State University

Electron Microscopic Observations Of Interfacial Voids In Aluminum Created By Alkaline Dissolution, Saikat Adhikari, L. Scott Chumbley, H. Chen, Y. C. Jean, A. C. Geiculescu, Kurt R. Hebert

L. Scott Chumbley

We report evidence from electron microscopy and positron annihilation spectroscopy (PAS) for the formation by alkaline dissolution of nm-scale voids in aluminum near the metal-oxide interface. Imaging was carried out using transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM) and field emission scanning electron microscopy (FESEM). EM images supported the PAS finding that voids were found within tens of nm of the interface, and revealed that the void number density increased by at least 10 times due to dissolution. From TEM, void number densities were on the order of 108 cm-2. From TEM and SEM, voids appeared circular in ...


New Laser Optical Fiber For Laser Surgery, Sheila A. Grant, Abdel Soufiane, Steve W. Martin, Gerald Shirk 2015 Iowa State University

New Laser Optical Fiber For Laser Surgery, Sheila A. Grant, Abdel Soufiane, Steve W. Martin, Gerald Shirk

Steve W. Martin

Nd:YAG laser systems, coupled to silica fibers, have shown great benefits as surgical tools. Using the laser system with a bare silica fiber, laser surgeons can photocoagulate tissue to depths of 4 to 5 mm in a non-contact mode. In a contact mode, incision and cauterization of the nearby tissue can be achieved. Although these two capabilities provide powerful tools for hemostatic procedures, research performed at Iowa State University has shown that the silica fiber tips undergo extensive damage when in contact with tissue. Chemical and thermal degradation of the silica glass surface plays a key role. Damaged fibers ...


Development Of An Ultrasonic Method To Detect Cervical Remodeling In Vivo In Full-Term Pregnant Women, Barbara L. McFarlin, Jennifer Balash, Viksit Kumar, Timothy A. Bigelow, Xavier Pombar, Jacques S. Abramowicz, William D. O'Brien Jr. 2015 University of Illinois at Chicago

Development Of An Ultrasonic Method To Detect Cervical Remodeling In Vivo In Full-Term Pregnant Women, Barbara L. Mcfarlin, Jennifer Balash, Viksit Kumar, Timothy A. Bigelow, Xavier Pombar, Jacques S. Abramowicz, William D. O'Brien Jr.

Electrical and Computer Engineering Publications

The objective of this study was to determine whether estimates of ultrasonic attenuation could detect changes in the cervix associated with medically induced cervical remodeling. Thirty-six full-term pregnant women underwent two transvaginal ultrasonic examinations separated in time by 12 h to determine cervical attenuation, cervical length and changes thereof. Ultrasonic attenuation and cervical length data were acquired from a zone (Zonare Medical Systems, Mountain View, CA, USA) ultrasound system using a 5–9 MHz endovaginal probe. Cervical attenuation and cervical length significantly decreased in the 12 h between the pre-cervical ripening time point and 12 h later. The mean cervical ...


Three-Dimensional Confocal Microscopy Indentation Method For Hydrogel Elasticity Measurement, Donghee Lee, Md Mahmudur Rahman, You Zhou, Sangjin Ryu 2015 University of Nebraska-Lincoln

Three-Dimensional Confocal Microscopy Indentation Method For Hydrogel Elasticity Measurement, Donghee Lee, Md Mahmudur Rahman, You Zhou, Sangjin Ryu

Md Mahmudur Rahman

No abstract provided.


Simulating Low-Frequency Sonic Pulsations To Achieve Thrombolysis, Joseph C. Muskat, Matthew C. Pharris, Charles F. Babbs 2015 Purdue University

Simulating Low-Frequency Sonic Pulsations To Achieve Thrombolysis, Joseph C. Muskat, Matthew C. Pharris, Charles F. Babbs

The Summer Undergraduate Research Fellowship (SURF) Symposium

Cardiovascular thrombosis may result in critical ischemia to a range of anatomical regions, constituting a leading cause of death in the United States. Current invasive treatments for such arterial blockages often yield blood clot recurrence, resulting in repeated hospitalization of patients. This research aims to show how internally introduced pressure oscillations may be used to initiate thrombolysis. We present a novel computational model for determining the resonant frequency and corresponding deformation of an idealized thrombus. Sinusoidal pressure differences across the thrombus induce axial displacements of frequency dependent amplitude. The maximum peak displacement occurs at a resonant frequency of 73 Hz ...


Towards An Optical In-Line Characterization Of Nano Petals, Yiming Ding, Huisung Kim, Euiwon Bae 2015 Purdue University

Towards An Optical In-Line Characterization Of Nano Petals, Yiming Ding, Huisung Kim, Euiwon Bae

The Summer Undergraduate Research Fellowship (SURF) Symposium

Carbon Nano Petals (i.e. CNPs) are cantilevered multilayer grapheme sheets that are seeded from core graphite fibers. The resulting structure offers a possibility of minimizing interfacial losses in transport application, improved interactions with surrounding matrix materials in composites, and a route toward substrate independence for device applications. The mass production of CNPs on the substrate required a method that can provide synchronous feedback on the sample status without pulling them out of the production line. Different optical properties can be observed when surfaces with different roughness are illuminated with a highly coherent light such as a laser beam. Similarly ...


Biodegradable Nano-Hybrid Polymer Composite Networks For Regulating Cellular Behavior, Charles Henley Sprague 2015 University of Tennessee - Knoxville

Biodegradable Nano-Hybrid Polymer Composite Networks For Regulating Cellular Behavior, Charles Henley Sprague

Masters Theses

Photo-crosslinkable polymeric biomaterials have emerged in the field of biomedical research to promote tissue regeneration. For example, scaffolds that can be crosslinked and hardened in situ have been known to make suitable implant alternatives. Since injectable and photo-crosslinkable biomaterials offer the advantage of being minimally invasive, they have emerged to compete with autografts, a current highly invasive method to repair diseased tissue. A series of novel photo-crosslinkable, injectable, and biodegradable nano-hybrid polymers consisting of poly(ε-caprolactone fumarate) (PCLF) and polyhedral oligomeric silsesquioxane (POSS) has been synthesized in our laboratory via polycondensation. To engineer the material properties of the nano-hybrid networks ...


Molecular Dynamics Investigation Of The Arabinan-Cellulose Interface For Cellulose Nanocomposite Applications, Luke Thornley 2015 California Polytechnic State University - San Luis Obispo

Molecular Dynamics Investigation Of The Arabinan-Cellulose Interface For Cellulose Nanocomposite Applications, Luke Thornley

Materials Engineering

Atom level computer simulations of the arabinan and cellulose interface were performed to better understand the mechanisms that give arabinan-cellulose composites (ArCCs) their strength with the goal to improve man-made ArCCs. The molecular dynamics (MD) software LAMMPS was used in conjunction with the ReaxFF/c force field to model the bond between cellulose and arabinan. A cellulose nanocrystal with dimensions 51 x 32 x 8 Å was minimized with various weight percent of water, 0%, 3%, 5%, 8%, 10%, and 12%. After the system was equilibrated for at least 100,000 femtoseconds, an arabinan molecule composed of 8 arabinose rings ...


Methods For Growing Retinal Pigment Epithelial Cells: Current Protocols And Future Recommendations, Aaron H. Fronk 2015 Utah State University

Methods For Growing Retinal Pigment Epithelial Cells: Current Protocols And Future Recommendations, Aaron H. Fronk

All Graduate Plan B and other Reports

The retinal pigment epithelium (RPE) is a layer of tissue found in the vertebrate eye between Bruch’s membrane and the photoreceptor layer of the neural retina [1]. It is derived from the outer layer of the optic cup [2], possesses an innate immune system [3], and consists of a monolayer of highly pigmented cells that fit together in a tight matrix (fig. 1) [4]–[6]. The monolayer is often compared to a mosaic or cobblestones in its configuration, while the shape of the individual cells is usually described as polygonal/hexagonal, columnar (aligned perpendicular to the underlying membrane), or ...


Surface-Enhanced Raman Spectroscopy-Based Biomarker Detection For B-Cell Malignancies, Nathan Israelsen 2015 Utah State University

Surface-Enhanced Raman Spectroscopy-Based Biomarker Detection For B-Cell Malignancies, Nathan Israelsen

All Graduate Theses and Dissertations

This thesis presents a light scattering-based method for biomarker detection, which could potentially be used for the quantification of multiple biomarkers specific to B-cell malignancies. This method uses fabricated gold nanoparticle probes to amplify inelastic light scattering in a process referred to as surface-enhanced Raman scattering. These gold nanoparticle probes were conjugated to antibodies for specific and targeted molecular binding. The spectrum of the amplified inelastic light scattering was detected using a spectrometer and a detector. To detect the light scattering signal from the gold nanoparticle probes, several commercial Raman spectrometer instruments were evaluated. Initial results from these evaluations are ...


Investigation Of The Interaction Between Graphene Oxide And A Biopolymer Surface, Pei Pang 2015 College of William and Mary

Investigation Of The Interaction Between Graphene Oxide And A Biopolymer Surface, Pei Pang

Undergraduate Honors Theses

Graphene oxide (GO) is functionalized graphene sheet. Due to its exceptional mechanical properties, GO is widely considered a promising filler material for producing nanocomposites. Biopolymers are polymers produced by living organism. They are as strong and tough as synthetic polymers, yet feature exceptional biocompatibility. The combination of GO and biopolymers, then, can yield potential novel nanocomposites. These novel materials have the potential to possess a combination of outstanding properties. They would be thin, lightweight, strong, and biocompatible. Therefore, these materials can have many applications in various fields, such as biocompatible coatings and body implants. In this project, we report an ...


Designing A Clarifier To Recover Wastewater Algae Biomass For Production Of Biofuels, Elizabeth Martinez 2015 Utah State Univesity

Designing A Clarifier To Recover Wastewater Algae Biomass For Production Of Biofuels, Elizabeth Martinez

All Graduate Plan B and other Reports

The Logan Lagoons, Logan City’s Wastewater Treatment Facility ensures 15 million gallons of wastewater are cleaned and filtered each day. With the implementation of new and stricter wastewater effluent standards, the city of Logan now has to guarantee the phosphorous concentration in the effluent is also reduced. Algal biomass produced and harvested from the lagoons has been proven to affect the way nitrogen and phosphorous are removed, while having the potential to be converted to biofuels. Therefore, implementing a secondary type clarifier in the Logan Lagoons would produce treated water with a reduced phosphorous concentration, and algae feedstock for ...


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