Enhanced Carrier Transport By Transition Metal Doping In Ws2 Field Effect Transistors,
2020
State University of New York at Buffalo
Enhanced Carrier Transport By Transition Metal Doping In Ws2 Field Effect Transistors, Maomao Liu, Sichen Wei, Simran Shahi, Hemendra Nath Jaiswal, Paolo Paletti, Sara Fathipour, Maja Remskar, Jun Jiao, Wansik Hwang, Fei Yao, Huamin Li
Physics Faculty Publications and Presentations
High contact resistance is one of the primary concerns for electronic device applications of two-dimensional (2D) layered semiconductors. Here, we explore the enhanced carrier transport through metal–semiconductor interfaces in WS2 field effect transistors (FETs) by introducing a typical transition metal, Cu, with two different doping strategies: (i) a “generalized” Cu doping by using randomly distributed Cu atoms along the channel and (ii) a “localized” Cu doping by adapting an ultrathin Cu layer at the metal–semiconductor interface. Compared to the pristine WS2 FETs, both the generalized Cu atomic dopant and localized Cu contact decoration can provide a Schottky-to-Ohmic contact …
Development Of B-Type And Multi-Ion Doped Carbonated Hydroxyapatite Bioceramics,
2020
Universiti Malaya
Development Of B-Type And Multi-Ion Doped Carbonated Hydroxyapatite Bioceramics, Safarzadeh Marjan
Student Works (2020-2029)
The present research is aimed to investigate the effect of varying the carbonate to phosphate (CO32−/ PO43‒) molar ratios from 0.5 to 5 on the physical and mechanical properties of carbonated hydroxyapatite (CHA) synthesized by a wet chemical method. The sintering was performed under dry carbon dioxide atmosphere at 900 °C to maintain the B-type CHA structure. It was found that increases in CO32−/ PO43‒ ratio was accompanied by an increase in the c/a lattice ratio. The diffraction peaks of the synthesized 0.5-5 CHA powders exhibited a single phase material except for 5CHA which revealed the some minor calcite or …
Scanning Electron Microscopy (Sem) Investigation Of Morphology Changes In The Reduction Of Silica Nanoparticles To Elemental Silicon,
2020
Portland State University
Scanning Electron Microscopy (Sem) Investigation Of Morphology Changes In The Reduction Of Silica Nanoparticles To Elemental Silicon, Allison M. Cairns
University Honors Theses
The application of silicon nanoparticles varies from energy storage materials, to drug-delivery, and molecular recognition. Various chemical and physical properties of the Si nanoparticles arise from their morphology. This paper aims to reveal the morphology of Si nanoparticles following magnesiothermic reduction of silica (SiO2) nanoparticles. Two sets of SiO2 nanoparticles were used, commercially available NanoXact nanoparticles and laboratory-synthesized Stöber nanoparticles. A Zeiss Sigma VP FEG SEM was used to examine the morphology. Following the magnesiothermic reduction, the nanoparticles were etched with HF. Ten sets of images were taken of both Stöber and NanoXact nanoparticles: 1,2: the SiO …
Role Of Thyroid Hormone Modulating Astrocyte Activation,
2020
University of South Florida
Role Of Thyroid Hormone Modulating Astrocyte Activation, Payal Ghosh
USF Tampa Graduate Theses and Dissertations
Astrocytes are the specialized cells in the central nervous system (CNS). They play an important role in neuronal homeostasis. When activated, astrocytes may cause neuronal inflammation and degeneration. Thyroid hormones are important in maintaining neuronal development and homeostasis. Astrocytes play a pivotal role in this process. However, the role of levothyroxine (T4) in neuroinflammation is not clear. It is hypothesized that thyroid hormone treatment will reduce the inflammatory activation in astrocytes. Available oral T4 supplementations allow accumulation of T4 in the body and cause toxicity and side effects. It is hypothesized that the encapsulation of T4 in liposomes would reduce …
A Wirelessly Controlled Smart Bandage With 3d-Printed
Miniaturized Needle Arrays,
2020
University of Nebraska - Lincoln
A Wirelessly Controlled Smart Bandage With 3d-Printed Miniaturized Needle Arrays, Hossein Derakhshandeh, Fariba Aghabaglou, Alec Mccarthy, Azadeh Mostafavi, Chris Wiseman, Zack Bonick, Ian Ghanavati, Seth Harris, Craig Kreikemeier-Bower, Seyed Masoud Moosavi Basri, Jordan Rosenbohm, Ruiguo Yang, Pooria Mostafalu, Dennis Orgill, Ali Tamayol
Department of Mechanical and Materials Engineering: Faculty Publications
PUBLIC ACCESS
Luciferase Reporter Crc Cell Line For Bioluminescence Imaging In Orthotopic Tumor Model,
2020
University of South Florida
Luciferase Reporter Crc Cell Line For Bioluminescence Imaging In Orthotopic Tumor Model, Pratik Chopade
USF Tampa Graduate Theses and Dissertations
CRC is the second most common type of cancer in women and the third most common type of cancer in men. It accounts for 9.7% of all cancers in terms of people diagnosed. Measuring the real-time effect of chemotherapeutic drugs has been a major obstacle in developing a tumor model mouse. Tracking the regression of cancer cells after chemotherapy could be an effective way to resolve this issue. Therefore, cancer cells expressing the constitutive luciferase reporter gene can be a potential solution. The biggest advantage of the luciferase (Luc) reporter is that it is detectable at very low concentrations in …
Identification Of Snps Associated With Multiple Antibiotic Resistance Genes In Eight Clinical Variants Of Enterococcus Faecium.,
2020
University of South Florida
Identification Of Snps Associated With Multiple Antibiotic Resistance Genes In Eight Clinical Variants Of Enterococcus Faecium., Krishna S. Karia
USF Tampa Graduate Theses and Dissertations
The evolution of multi drug resistant (MDR) bacteria has been well documented these last decade, suggesting that resistance to antibiotics is most commonly associated to single nucleotide polymorphism (SNPs) mutation. To this aim, several molecular methods have been performed to elucidate SNPs in the increasing number of resistant microorganisms. Early detection of MDR bacteria has become of prime necessity in order to combat the disease and ensure public health. Therefore, this research was conducted to screen for SNP mutations correlated to drug resistance in some nosocomial MDR bacteria strains donated from Moffitt Cancer Center (MCC) hospital. Blood, stool, urine, and …
A Micro-Nano Particle System For Sustained Drug Release In Lung Cancer Therapy,
2020
University of South Florida
A Micro-Nano Particle System For Sustained Drug Release In Lung Cancer Therapy, Heta N. Jadhav
USF Tampa Graduate Theses and Dissertations
Lung cancer remains the leading cause of cancer-related mortality in men and women worldwide (National Comprehensive Cancer Network). Hence, developing an effective new therapy to treat lung cancer is under intense investigation. Specifically, the sustained release of a drug in lung tumors is critically important. Previous studies at the USF have shown that telmisartan exhibits synergistic properties when combined with Actinomycin-D for lung cancer treatment. The objective of this study is to develop a novel micro/nano system consisting of lipids and chitosan polymers that would be able to deliver Tel directly to the lungs and release its payloads in a …
Role Of Serum Amyloid P Component In The Pathogenesis Of Chronic Traumatic Encephalopathy,
2020
University of South Florida
Role Of Serum Amyloid P Component In The Pathogenesis Of Chronic Traumatic Encephalopathy, Brittany Urban
USF Tampa Graduate Theses and Dissertations
Serum amyloid P (SAP) component is a glycoprotein that is a major constituent of human serum. SAP has been recognized to stimulate amyloid fibrillogenesis. One way that SAP can be transported to the brain is by passing through the blood brain barrier (BBB). Traumatic brain injury (TBI) and repeated or severe non-penetrating head injury, can escalate the exposure of the brain to SAP, which in turn can contribute to neurodegeneration. TBI can lead to chronic traumatic encephalopathy (CTE) which is a neuropathological condition that has been found in people who have been exposed to repeated head injuries or impacts. In …
Sunitinib-Loaded Mpeg-Pcl Micelles For The Treatment Of Age-Related Macular Degeneration,
2020
University of South Florida
Sunitinib-Loaded Mpeg-Pcl Micelles For The Treatment Of Age-Related Macular Degeneration, Jarriaun D. Streets
USF Tampa Graduate Theses and Dissertations
Age-related Macular Degeneration, or AMD will be responsible for the vision impairment of more than 5 million late-aged adults in the next 30 years. Current treatment options include frequent intravitreal injections which report high levels of pain resulting in a low patient compliance. However, there are methods of drug delivery that can decrease the amount of intravitreal injections by sustaining drug release. Polymeric micelles, specifically MPEG-PCL have reported superb biocompatibility and more efficient ways of delivering anti-VEGF drugs such as Sunitinib to the posterior segment of the eye. In this study, the novel micellar formulation exhibited an average DLS particle …
Synthesis Of A Targeted Ph Responsive Nanoparticle For Controlled Release Of Actinomycin D,
2020
University of South Florida
Synthesis Of A Targeted Ph Responsive Nanoparticle For Controlled Release Of Actinomycin D, Alejandro Jesus Gonzalez
USF Tampa Graduate Theses and Dissertations
Out of all cancer diagnosis’s, lung cancer has the highest mortality in both sexes making it the leading cause of cancer deaths. Current therapeutic and clinical methods fail to successfully treat the disease, contributed to the development of multi-drug resistance (MDR). Hence, new therapies are needed that can exploit the tumor microenvironment (TME) to target Cancer Stem Cells (CSC). CSCs constitute a key population of the TME, promoting hypoxia, low intracellular pH, and angiogenesis. Actinomycin D (ACD) is a potent CSC inhibitor, but due to its high toxicity and lack of specificity towards cancer cells presents a need for a …
Testing Glutathione-S-Transferase Mu 1 (Gstm1) In Protecting Retinal Pigment Epithelium Cells From Oxidative Stress,
2020
University of South Florida
Testing Glutathione-S-Transferase Mu 1 (Gstm1) In Protecting Retinal Pigment Epithelium Cells From Oxidative Stress, Inyoung C. Garner
USF Tampa Graduate Theses and Dissertations
Currently, the most widely available treatment for wet age-related macular degeneration (AMD) involves the intraocular delivery of biopharmaceuticals, such as anti-VEGF therapy. Drawbacks of this treatment includes a short-term efficacy, requiring repeated injections with additional risks, and a limited availability of options for non-responders. Furthermore, there are no treatments available for patients diagnosed with dry-AMD. The drawbacks and limitations of current therapies represent a need for more effective and permanent therapy as the prevalence of the population affected by AMD is growing. Antioxidant gene therapies are one solution to these implications, protecting the cells from oxidative stress which is one …
Amino Acid Quantification For Dmc Biotechnologies,
2020
Dartmouth College
Amino Acid Quantification For Dmc Biotechnologies, Russell Beckerman, Rebecca Hines, Kenya Jacob, Megan Mccabe, Ju Yun Lee
ENGS 89/90 Reports
From pharmaceuticals to biofuels, fermentation bioprocessing has gained traction in many industries reaching a global market value of almost $60 billion in 2018. However, applications of bioprocessing have been limited in scope due to high capital costs, long development times, and difficulties maintaining productivity during scale-up. Furthering development and scale-up of fermentation bioprocesses require careful monitoring and control through analytical chemistry. Currently, there are no small molecule quantification techniques that are sufficiently accurate, inexpensive, and high-throughput. This investigation explores viability of a novel quantification assay for amino acids in fermentation broth leveraging molecularly imprinted polymers (MIPs) and gold nanoparticles (AuNPs).
Laser Induced Thermal Degradation Of Carbon Fiber-Carbon Nanotube Hybrid Laminates,
2020
Air Force Institute of Technology
Laser Induced Thermal Degradation Of Carbon Fiber-Carbon Nanotube Hybrid Laminates, Joshua A. Key
Theses and Dissertations
Recent advancements in fiber laser technology have increased interest in target material interactions and the development of thermal protection layers for tactical laser defense. A significant material of interest is carbon fiber reinforced polymers due to their increased use in aircraft construction. In this work, the thermal response of carbon fiber-carbon nanotube (CNT) hybrid composites exposed to average irradiances of 0.87-6.8 W/cm2 were observed using a FLIR sc6900 thermal camera. The camera had a pixel resolution of 640x512 which resulted in a spatial resolution of 0.394x0.383 mm/pixel for the front and 0.463x0.491 mm/pixel for the back. The hybrid samples …
Electrochemical Impedance Spectroscopy For Electrocatalytic Interfaces And Reactions: Classics Never Die,
2020
College of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China;
Electrochemical Impedance Spectroscopy For Electrocatalytic Interfaces And Reactions: Classics Never Die, Jun Huang
Journal of Electrochemistry
This review article recapitulates electrochemical impedance spectroscopy (EIS) studies in the field of electrocatalysis. The history of this specialized field, ranging from the beginning of the twentieth century to now, is outlined. We then chronicle milestones of the impedance theory. Special emphases are put on the Dolin-Ershler model, the prevailing model for analyzing adsorption impedance data. Afterwards, we narrow into a very specific and fundamental topic, the double-layer capacitance at platinum (Pt) single crystals. We discuss the challenges in experimentation and theoretical understanding thereof. We cast doubts into the validity of using the Dolin-Ershler model to obtain the double-layer capacitance …
Electrochemical Preparations And Applications Of Nano-Catalysts With High-Index Facets,
2020
State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry,College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
Electrochemical Preparations And Applications Of Nano-Catalysts With High-Index Facets, Chi Xiao, Na Tian, Zhi-You Zhou, Shi-Gang Sun
Journal of Electrochemistry
The performance of catalysts highly depends on their surface structure and composition. Nanocrystals bounded by high-index facets usually exhibit high catalytic activity due to their high-density low-coordinated step atoms with high reactivity. In this paper, we have reviewed the preparations of noble metals (e.g., Pt, Pd and Rh) nanocatalysts with high-index facets by electrochemical square-wave potential method developed in our group. The square-wave potential method includes a nucleation procedure to generate nuclei, followed by a square-wave potential procedure for a certain period of time for the growth of nuclei into nanocrystals. The formation mechanism of high-index facets is also discussed. …
In-Situ Raman Spectroscopic Study Of Electrochemical Reactions At Single Crystal Surfaces,
2020
College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, China;
In-Situ Raman Spectroscopic Study Of Electrochemical Reactions At Single Crystal Surfaces, Min Su, Jin-Chao Dong, Jian-Feng Li
Journal of Electrochemistry
Since the 1970s, in-situ spectroscopy (Raman, infrared, etc.) has been used to systematically study the electrochemical interfacial reactions which can provide more information about surface reactions and reveal the mechanisms from microscopic view due to its excellent surface sensitivity and energy resolution. With the development of nano-technology, surface-enhanced Raman scattering effect spectroscopy has made rapid progress. Recently, the emergence of SHINERS provides a good in-situ spectroscopic technique for the study of catalytic reactions on single crystal model electrodes with deterministic surface structure. In this paper, we have summarized the application of SHINERS in the study of …
In-Situ Gold-Ceria Nanoparticles: Superior Optical Fluorescence Quenching Sensor For Dissolved Oxygen,
2020
Old Dominion University
In-Situ Gold-Ceria Nanoparticles: Superior Optical Fluorescence Quenching Sensor For Dissolved Oxygen, Nader Shehata, Ishac Kandas, Effat Samir
Electrical & Computer Engineering Faculty Publications
Cerium oxide (ceria) nanoparticles (NPs) have been proved to be an efficient optical fluorescent material through generating visible emission (~530 nm) under violet excitation. This feature allowed ceria NPs to be used as an optical sensor via the fluorescence quenching Technique. In this paper, the impact of in-situ embedded gold nanoparticles (Au NPs) inside ceria nanoparticles was studied. Then, gold–ceria NPs were used for sensing dissolved oxygen (DO) in aqueous media. It was observed that both fluorescence intensity and lifetime were changed due to increased concentration of DO. Added gold was found to enhance the sensitivity of ceria to DO …
Cycle-To-Cycle Flow Variations In A Square Duct With A Symmetrically Oscillating Constriction,
2020
University of Nebraska-Lincoln
Cycle-To-Cycle Flow Variations In A Square Duct With A Symmetrically Oscillating Constriction, Erica Sherman, Lori M. Lambert, Bethany White, Michael H. Krane, Timothy Wei
Department of Mechanical and Materials Engineering: Faculty Publications
Spatially and temporally resolved Digital Particle Image Velocimetry (DPIV) measurements are presented of flow complexities in a nominally two-dimensional, symmetric, duct with an oscillating constriction. The motivation for this research lies in advancing the state-of-the-art in applying integral control volume analysis to modeling unsteady internal flows. The specific target is acoustic modeling of human phonation. The integral mass and momentum equations are directly coupled to the acoustic equations and provide quantitative insight into acoustic source strengths in addition to the dynamics of the fluid-structure interactions in the glottis. In this study, a square cross-section duct was constructed with symmetric, computer …
Development Of Integrated Zinc Oxide Nanorods Coated Glass Substrate Sensing Device,
2020
Universiti Malaya
Development Of Integrated Zinc Oxide Nanorods Coated Glass Substrate Sensing Device, Mohd Yusof Haziezol Helmi
Student Works (2020-2029)
A simple and practical cost-effective integrated zinc oxide (ZnO) nanorods coated glass substrate sensing device for humidity and formaldehyde vapor sensing applications is reported. The developed sensor device is composed of a commercial light-emitting diode (LED) and photodiode that correspondingly served as light source and detector which precisely positioned on a 3D printed sensor platform. A receiver circuit and Arduino platform were employed for signal amplification and processing. A uniform ZnO nanorods coating were grown on the surface of glass substrate via hydrothermal method by controlling the growth durations and coating length. A standard reference for the optimum working condition …
