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2017

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Quantum Dragon Solutions For Electron Transport Through Single-Layer Planar Rectangular, Godfred Inkoom Dec 2017

Quantum Dragon Solutions For Electron Transport Through Single-Layer Planar Rectangular, Godfred Inkoom

Theses and Dissertations

When a nanostructure is coupled between two leads, the electron transmission probability as a function of energy, E, is used in the Landauer formula to obtain the electrical conductance of the nanodevice. The electron transmission probability as a function of energy, T (E), is calculated from the appropriate solution of the time independent Schrödinger equation. Recently, a large class of nanostructures called quantum dragons has been discovered. Quantum dragons are nanodevices with correlated disorder but still can have electron transmission probability unity for all energies when connected to appropriate (idealized) leads. Hence for a single channel setup, the electrical conductivity …

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Race, Drugs, And Sentencing: A Quantitative Analysis Of Sentencing Outcomes For Federal Cocaine And Methamphetamine Drug Offenses, Makeela Johari Wells Dec 2017

Race, Drugs, And Sentencing: A Quantitative Analysis Of Sentencing Outcomes For Federal Cocaine And Methamphetamine Drug Offenses, Makeela Johari Wells

Theses and Dissertations

For decades, the United States has fought a “War on Drugs” with no success. This war has led to substantial increases in the number of individuals incarcerated in the United States prison system. The following dissertation investigates the impact of the Fair Sentencing Act of 2010 (FSA 2010) on sentencing decisions for crack and powder cocaine offenders sentenced in the federal system. The FSA 2010 is a federal policy that reduced the crack-to-powder cocaine quantity from 100-to1 to 18-to-1 in an effort to reduce racial/ethnic disparity in sentencing associated with harsh penalties. Specifically, I examined federal crack cocaine and powder …

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Imaging Calcium Carbonate Crystallization In Association With Organic Compounds, Maurice Philip Testa Dec 2017

Imaging Calcium Carbonate Crystallization In Association With Organic Compounds, Maurice Philip Testa

Theses and Dissertations

The objective of this study is to better understand the relationship between organic compounds and carbonate mineral growth in different natural environments by imaging the interface between organic compounds and carbonate precipitates in ancient and modern rocks, and laboratory experiments. Three separate projects were designed to document the organic/carbonate mineral interface through imagery. 1) Images of the interfaces between organic components and initial mineral precipitates were investigated in a deteriorating microbial mat from Vermelha, Brazil that was taken from the site in 2006. As the mat deteriorated the amount of calcification increased. A section of the transitional section between living …

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Impacts Of Immigration Policy Changes On Employment Of Foreign Born Doctorate Recipients, Jun Cheng Dec 2017

Impacts Of Immigration Policy Changes On Employment Of Foreign Born Doctorate Recipients, Jun Cheng

Theses and Dissertations

The H-1B visa program was initiated in 1990 to temporarily hire highly-skilled foreign workers. The H-1B visa program has changed several times since its initiation. One of the most important changes occurred in 2001 when the 21st Century Act exempted individuals employed by institutions of higher education and nonprofit and government research organizations from the H-1B visa cap increasing the number of visas available for foreign high-skilled immigrants. To analyze the impact of policy changes affecting the H-1B program on highly-skilled workers, we study the behavior of foreign-born Ph.D. students who graduated from institutions in the United States over the …

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In Vitro And In Vivo Effects Of An Encapsulated Butyric Acid And A Lactic Acid Producing Bacteria Used Alone Or In Combination, Dana Kristen Dittoe Dec 2017

In Vitro And In Vivo Effects Of An Encapsulated Butyric Acid And A Lactic Acid Producing Bacteria Used Alone Or In Combination, Dana Kristen Dittoe

Theses and Dissertations

Lactic acid producing bacteria (LAB) and organic acids have been proposed as effective alternatives to antibiotics, however there is limited literature concerning their combination. Thus, the objective of this thesis was to investigate the effects of LAB, encapsulated butyric acid (EBA), and their combination. Under challenged conditions, the in vitro study demonstrated that both EBA and LAB were capable of reducing pathogen proliferation over time, with greater efficacy at lower initial concentration. However, EBA demonstrated a greater effectiveness on pathogen reduction. Under challenged conditions, the results of the in vivo study indicated that birds fed LAB performed comparatively to that …

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Incorporating Fermented By-Products Of Lactobacillus Diolivorans Sp. In Food Grade Coatings Designed For Inhibition Of Tyrophagus Putrescentiae On Dry-Cured Hams, Hector Asis Portillo Dec 2017

Incorporating Fermented By-Products Of Lactobacillus Diolivorans Sp. In Food Grade Coatings Designed For Inhibition Of Tyrophagus Putrescentiae On Dry-Cured Hams, Hector Asis Portillo

Theses and Dissertations

Distillate solutions that were derived from concentrated ferment were incorporated into either a carrageenan (CG) and propylene glycol alginate (PGA) gum blend or into a CG, PGA, and xanthan gum (XG) blend. Distillate treatments were compared against a 10% propylene glycol treatment, a gum only control, and negative control using three hams that were cut into 2.5 cm thick slices and then cut into 2.5×2.5×2.5cm cubes (n=50) that were dipped into solutions prior to conducting mite bioassays. Coated and control ham cubes were inoculated with 20 adult mites from the species T. putrescentiae (Schrank), and incubated for 2 and 3 …

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African American Male Students' Perceptions Of The Community College Experience In Rural Louisiana And How It Influences Graduation And Retention Rates, Aaron Jagers Dec 2017

African American Male Students' Perceptions Of The Community College Experience In Rural Louisiana And How It Influences Graduation And Retention Rates, Aaron Jagers

Theses and Dissertations

This quantitative study explored the obstacles African American male students face that can hinder their academic progress at community colleges within the rural regions of Louisiana. This study viewed the collective experiences of African American males in community colleges in order to improve their academic outcomes, completion, and retention rates. This study also explored the African American male’s educational experiences and the personal and academic obstacles they faced as students in the community college environment. This study used a research design that collected data from African American male students in two rural Louisiana community colleges. This study utilized a survey …

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Alternative Post Emergence Nitrogen Management Strategies For Delayed-Flood Rice Production, Richard Edward Turner Dec 2017

Alternative Post Emergence Nitrogen Management Strategies For Delayed-Flood Rice Production, Richard Edward Turner

Theses and Dissertations

Rice (Oryza sativa L.) that is grown in the U.S. is predominantly grown in the mid-south. Current Mississippi State University recommendations for nitrogen (N) fertilization of rice suggest a single application of 168 kg N ha-1 on soils with CEC ¡Ü 20 and 202 kg N ha-1 on soils with CEC > 20. The primary objective was to identify alternative N management strategies that may potentially be used to reduce costs associated with aerial application of N fertilizer to rice. Research was established at the Delta Research and Extension Center, at Stoneville, MS, on two soil textures during 2015 and 2016. …

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The Application And Exploration Of The City Biodiversity Index Through A Case Study Of The City Of Starkville, Mississippi, Leslie Rhea Moma Dec 2017

The Application And Exploration Of The City Biodiversity Index Through A Case Study Of The City Of Starkville, Mississippi, Leslie Rhea Moma

Theses and Dissertations

During the 21st century, more people will reside in cities than in rural areas for the first time in human history. As cities expand to accommodate their growing population, pressure is mounting on local biodiversity and the ecosystems they support. This prompted the U.N. Convention on Biological Diversity - in collaboration with the City of Singapore - to develop a biodiversity index specifically for cities. In 2014, the final draft of the City Biodiversity Index was released. Twenty-three indicators comprise three categories that assess: native biodiversity, ecosystem services, and municipal support for local biodiversity. A case-study was designed for Starkville, …

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The Characterization Of Zebrafish Natural Killer Cells And Their Role In Immunological Memory, Preeti Judith Muire Dec 2017

The Characterization Of Zebrafish Natural Killer Cells And Their Role In Immunological Memory, Preeti Judith Muire

Theses and Dissertations

Rag1-/- mutant zebrafish lack lymphocytes and were used to study the basis of acquired protective immunity in the absence of lymphocytes to the intracellular bacterium Edwardsiella ictaluri. This study morphologically identified and quantified lymphocyte like cells (LLCs) present in the liver, kidney and spleen of these fish. LLCs included Natural Killer (NK) cells and non-specific cytotoxic cells (NCCs) and were discriminated by size, and by the presence of cytoplasmic granules. The antibodies anti-NITR9, anti-NCCRP-1 (5C6) and anti-MPEG-1 were used to evaluate these cell populations by flow cytometry. Gene expression profiles in these tissues were evaluated after the Rag1-/- mutants were …

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The Defense Response Of Glycine Max To Heterodera Glycines And Macrophomina Phaseolina, Bisho Ram Lawaju Dec 2017

The Defense Response Of Glycine Max To Heterodera Glycines And Macrophomina Phaseolina, Bisho Ram Lawaju

Theses and Dissertations

The understanding of plant defense response in plant-pathogen interaction provides useful information to combat the disease. Soybean cyst nematode (SCN), Heterodera glycines, and charcoal rot causing fungus, Macrophomina phaseolina, are major pathogens of soybean, Glycine max, and infestation with SCN has found to aggravate the fungal disease severity. The gene expression analysis in resistant and susceptible interactions between H. glycines and G. max has identified some candidate resistance genes and signaling pathways but they are yet to be fully characterized. This dissertation aims to characterize one such gene, Conserved Oligomeric Golgi (COG) complex. The COG complex is important in structural …

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The Effect Of Controlling Temperature And Relative Humidity On Tyrophagus Putrescentiae (Schrank) (Sarcoptiformes: Acaridae) Infestations On Dry Cured Hams Treated In Food Grade Ingredient Infused Nets, Jasmine Deneen Hendrix Dec 2017

The Effect Of Controlling Temperature And Relative Humidity On Tyrophagus Putrescentiae (Schrank) (Sarcoptiformes: Acaridae) Infestations On Dry Cured Hams Treated In Food Grade Ingredient Infused Nets, Jasmine Deneen Hendrix

Theses and Dissertations

Since methyl bromide is an ozone depleting substance, there is a significant need to find effective alternative compounds to control mite infestations on dry cured hams. Therefore, the objective of this study was to determine the most effective relative humidity and/or temperature to minimize mite reproduction and mold growth on dry cured hams in untreated and food grade ingredient infused nets. Mites on ham slices in untreated nets were reduced from the initial inoculum level of 50 mites per ham slice when exposed to 85% RH at 24, 28, and 32°C. Results indicated that hams should be stored at 85% …

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The Effects Of The First Year Of Implementation Of Positive Behavioral Intervention Supports, Rosalind Flanigan Operton Dec 2017

The Effects Of The First Year Of Implementation Of Positive Behavioral Intervention Supports, Rosalind Flanigan Operton

Theses and Dissertations

Disciplinary practices and protocols in schools have been a notable concern over the past 30 years. The traditional punitive punishment-based tactics have not proven to be effective in changing student behavior. Positive Behavior Intervention Supports (PBIS) is a proactive alternative that puts whole school systems in a place wherein students and teachers share in the responsibility of building a culture and climate of behaviors that produce positive outcomes. Research based on the implementation of PBIS in schools has concluded that problem behaviors decrease, students and staff feel safe, and attendance improves. There is a body of research that concludes that …

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Monetary Valuation Of Waterfront Open Space In Coastal Areas Of Mississippi And Alabama, Ram Prasad Dahal Dec 2017

Monetary Valuation Of Waterfront Open Space In Coastal Areas Of Mississippi And Alabama, Ram Prasad Dahal

Theses and Dissertations

Open space provides a wide range of ecosystem services to communities. In growing communities, open space offers relief from congestion and other negative externalities associated with rapid development. To make effective policy and planning decisions pertaining to open space preservation, it is important to estimate monetary values of its benefits. In addition, assessing public opinions regarding open space provides information on demand and how residents value open space. This study estimated the monetary value of open space in Mississippi and Alabama Gulf Coast communities. The study also collected information on coastal residents’ attitudes towards open space, working waterfronts, and their …

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The Perceptions And Usage Of Social Media In Higher Education, Nancy B. Bardwell Dec 2017

The Perceptions And Usage Of Social Media In Higher Education, Nancy B. Bardwell

Theses and Dissertations

The study examined students’ perceptions of Facebook, Twitter and blogs as tools for learning in a classroom environment. The population of the research was of 109 students from a 4-year college located in the southern region of the US. The results showed that most of the students were undecided in their perception of Facebook, Twitter and blogs as learning tools. The findings also showed that most of the participants were undecided in perception that Facebook, Twitter and blogs were viewed as sources of learning distraction. The findings equally indicated that significant number (about half of the population) of the participants …

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Time Frame For Transitive And Reciprocal Inferences, Ross Allen Mccool Dec 2017

Time Frame For Transitive And Reciprocal Inferences, Ross Allen Mccool

Theses and Dissertations

In language, information is omitted for brevity. Comprehension requires inferences to be made, but do we make such inferences during encoding or later? Kintsch (1988) claimed that transitive inferences are made during reading and proposed transitive inferences are extracted from a constructed mental image. Two experiments were performed to test his ideas. Participants read sentences permitting a transitive or reciprocal inference, then immediately answered an inference based question. Data included reaction time and accuracy. By comparing verification against inferential sentences, it is possible to determine if the inference is made during encoding or later. A further manipulation was to compare …

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Toward A Molecular Mechanism Of Phase Separation In Disordered Elastin-Like Proteins, Yue Zhang Dec 2017

Toward A Molecular Mechanism Of Phase Separation In Disordered Elastin-Like Proteins, Yue Zhang

Theses and Dissertations

Since the last decade, an increasing number of proteins have been shown to be capable of undergoing reversible liquid-liquid phase separation (LLPS) in response to an external stimulus, and the resulting protein-rich phase (coacervate) is considered as one of the main components of membrane-less organelles. Most of these proteins are intrinsically disordered proteins (IDPs) or contain intrinsically disordered regions. More importantly, LLPS often plays an important role in cellular signaling and development of cells and tissues. However, the molecular mechanisms underlying LLPS of proteins remain poorly understood. Elastin-like proteins (ELPs), a class of IDPs derived from the hydrophobic domains of …

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Transcriptome-Wide Prevalence Of Selection Among Wild Populations Of Helianthus Annuus (Common Sunflower), Michael Emmett Kartje Dec 2017

Transcriptome-Wide Prevalence Of Selection Among Wild Populations Of Helianthus Annuus (Common Sunflower), Michael Emmett Kartje

Theses and Dissertations

In the present study, I used transcriptomic data to elucidate the role of selection in maintaining genetic cohesion and promoting divergence among wild populations of the annual sunflower Helianthus annuus. I observed that nearly half of the loci displaying high levels of population structure (44%) show allele frequency spectrum skew consistent with recent exposure to natural selection. Among transcriptomic regions at which allele frequency divergence is lowest, fewer loci maintain strong signals of selection (34%). Additionally, I find evidence supporting the maintenance of evolutionarily complex haplotype structure within populations at loci showing high levels of among-population allele frequency divergence.

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Use Of Formative Research To Develop A Healthy Eating Social Marketing Campaign For Low Resource Families In Mississippi, Rahel Mathews Dec 2017

Use Of Formative Research To Develop A Healthy Eating Social Marketing Campaign For Low Resource Families In Mississippi, Rahel Mathews

Theses and Dissertations

Mississippi leads the nation in chronic disease, obesity, poverty, and food insecurity. Preventing further growth in disease rates, requires a cultural shift towards a ‘healthy eating’ environment. Healthy patterns of food consumption along with physical activity can prevent and reduce these rates. A state-wide ‘healthy eating’ social marketing campaign could motivate voluntary population behavioral change. Three different methodologies were used to develop a strategy for Mississippi: a systematic review of the literature, a state-wide phone survey (quantitative), and focus groups (qualitative). A systematic review of articles published since January 2007 was conducted, using PRISMA guidelines. Five databases were searched with …

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Using Deuterium And Oxygen-18 Stable Isotopes To Understand Mechanisms Of Stemflow Generation As A Function Of Tree Species And Climate, Mercedes Siegle-Gaither Dec 2017

Using Deuterium And Oxygen-18 Stable Isotopes To Understand Mechanisms Of Stemflow Generation As A Function Of Tree Species And Climate, Mercedes Siegle-Gaither

Theses and Dissertations

Stemflow creates biogeochemical hotspots at tree bases. Few studies examine bark structure effects on stemflow generation via stable isotopes. Stemflow volume and isotopic composition (δD, δ18O) were measured over 15 months to address three main objectives: to determine origins and pathways of stemflow, to identify differences in stemflow generation mechanisms between tree species, and to identify differences in stemflow generation mechanisms between meteorological events. Laser ablation spectroscopy showed that, compared to throughfall and precipitation, stemflow was isotopically enriched, signifying isotopic fractionation. A bark-wetting experiment showed bark water storage capacity to be greatest in species with thick, continuous bark. Isotopic composition …

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Wastewater Remediation Using Modified Biochars, Griffin Allen Burk Dec 2017

Wastewater Remediation Using Modified Biochars, Griffin Allen Burk

Theses and Dissertations

Water polluted by metals and phosphates can be hazardous to both the environment and human health. The aim of this study was used to improve understanding of the adsorption properties of low-cost, green adsorbents for removal of pollutants from aqueous solution. Biochar was used as an adsorbent, which was produced from the gasification of pine wood waste and the fast pyrolysis of Douglas fir. Biochar is a bio-renewable product that can easily be modified, and the cost is lower compared to other adsorbents like activated carbon. The gasifier produced biochar was modified by coating the biochar surface with chitosan. Douglas …

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Formulation Of Whey Protein Stabilized Multilayered Microemulsion And Nanoemulsion Systems With Hyperoxidative Curcumin, Soma Mukherjee Dec 2017

Formulation Of Whey Protein Stabilized Multilayered Microemulsion And Nanoemulsion Systems With Hyperoxidative Curcumin, Soma Mukherjee

Theses and Dissertations

A primary emulsion with whey protein isolate (WPI) and hexanoic acid was prepared, and chitosan (Ch) (0.01%, 0.02%, and 0.03%) was added to evaluate its impact on particle size distribution of the emulsion. NaCl (0, 20, 40, and 80 mM) was added to increase ionic interactions to stabilize the multilayer emulsion. Lecithin (0.5%, 1%, 2%, 3 %, w/v) was mixed with the primary emulsion in order to form a multilayer, and casein hydrolysate (CH) was used to stabilize the tertiary emulsion system without the use of NaCl for 28 d at 4 °C. Stable O/W nanoemulsions were generated for use …

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Fracture Study On 2014-T6 (Lt) Aluminum Alloy Sheet Using Critical-Crack-Tip-Opening Angle Criterion, Sara Himmiche Dec 2017

Fracture Study On 2014-T6 (Lt) Aluminum Alloy Sheet Using Critical-Crack-Tip-Opening Angle Criterion, Sara Himmiche

Theses and Dissertations

A two-parameter fracture criterion (TPFC), relates the linear-elastic stress intensity factor KIe and net-section stress Sn at failure with two-material parameters, KF and m. The objective of this work was to validate the TPFC. Two-dimensional elastic-plastic finite-element analyses (FEA) were used with the critical crack-tip-opening-angle fracture criterion and a plane-strain-core height to match failure loads on middle-crack-tension, M(T), specimens made of 2014-T6 (LT) aluminum alloy. The same analyses were used on single-edge-crack-tension, SE(T), and-single-edge-crack-bend, SE(B), specimens. A wide range in specimen widths (w = 0.75 to 24 in.) were considered. The finite-element code, ZIP2D, was used to calculate critical stress-intensity …

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Listeria Monocytogenes Response To Sublethal Sodium Hypochlorite Induced Oxidative Stress On Its Biofilm Forming Ability And Antibiotic Resistance, Mohit Bansal Dec 2017

Listeria Monocytogenes Response To Sublethal Sodium Hypochlorite Induced Oxidative Stress On Its Biofilm Forming Ability And Antibiotic Resistance, Mohit Bansal

Theses and Dissertations

Listeria monocytogenes response to oxidative stress by sublethal sodium hypochlorite was investigated in this study. Continuous exposure of sublethal chlorine influenced biofilm formation and stress adaptation (homologous and heterologous) in L. monocytogenes. The biofilm forming ability of oxidative stress adapted and control cells were investigated on polystyrene surface at 22°C and 37°C. The oxidative stress adapted cells were found to form less biofilm in the presence of chlorine (p < 0.10) when compared to non-treated control cells at both the temperatures. In addition, the biofilm forming ability of L. monocytogenes was reduced significantly at higher sublethal chlorine concentrations (p < 0.10). In conclusion, oxidative stress adapted L. monocytogenes has developed tolerance to chlorine and some of the antibiotics. However, oxidative stress those cells did demonstrate an antibiofilm effect. This demonstrates that oxidative stress reduces L. monocytogenes biofilm formation but can also increase antibiotic resistance.

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Long-Term Effects Of Post-Fire Forest Structure On Understory Vegetation In Larch Forests Of The Siberian Arctic, Homero Pena Dec 2017

Long-Term Effects Of Post-Fire Forest Structure On Understory Vegetation In Larch Forests Of The Siberian Arctic, Homero Pena

Theses and Dissertations

Climate warming is increasing fire severity in boreal forests and can alter forest structure and carbon (C) dynamics in Cajander larch (Larix cajanderi) forests of Siberia, which occur over C and ice-rich yedoma permafrost. Altered forest structure may impact understory vegetation through changing canopy cover, permafrost thaw depth, and soil temperatures. The primary objective of this study was to assess the long-term impacts of fire-driven changes in tree density on understory composition, diversity, and C pools and the underlying soil organic layer (SOL). Shrubs dominated low density stands, likely from reduced canopy cover and thaw depth, while mosses dominated high …

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Management Practices For Corn Producers Implementing Early Planting As A Production Strategy, Matthew W. Hock Dec 2017

Management Practices For Corn Producers Implementing Early Planting As A Production Strategy, Matthew W. Hock

Theses and Dissertations

Producers choosing to implement an early corn planting management strategy often experience several yield limiting biotic and abiotic factors. Field variability, flooding, sub-optimal soil temperatures which leads to poor nutrient uptake, delayed emergence and reduced root growth can limit grain production. Three separate experiments were conducted to address some of the negative effects associated with early corn planting. Experiment 1 evaluated flooding effects on several morpho-physiological traits including root system architecture during early crop development. Hybrids (DKC 6208, Pioneer 1197) were flooded at planting (V0) and growth stages V1, V2, V3 for 0, 6, 12, 24, 48, 96 hours. Plants …

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Understanding Molecular Mechanisms Of Host-Edwardsiella Ictaluri Interaction, Nawar Hadi Al-Janabi Dec 2017

Understanding Molecular Mechanisms Of Host-Edwardsiella Ictaluri Interaction, Nawar Hadi Al-Janabi

Theses and Dissertations

Catfish, the "king" of the U.S. aquaculture, is threatened by a severe, systemic bacterial disease known as enteric septicemia of catfish (ESC). This disease causes high mortality and massive economic losses in cultured channel catfish (Ictalurus punctatus) in the United States. E. ictaluri penetrates catfish intestinal epithelia quickly and establishes a systemic infection rapidly. However, our knowledge on catfish intestine and E. ictaluri interaction is very limited. In Particular, catfish intestinal immune responses and virulence genes needed by E. ictaluri to evade host defenses are not well understood. Hence, our long-term goal is to identify the molecular mechanisms of E. …

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Classroom Responsibility In Transitioning Teachers: What Drives It When Self-Efficacy Is Lacking?, Shameeka Renee Deanes Dec 2017

Classroom Responsibility In Transitioning Teachers: What Drives It When Self-Efficacy Is Lacking?, Shameeka Renee Deanes

Theses and Dissertations

Previous research has linked self-efficacy to classroom responsibility noting that teachers take on more classroom responsibility when they have confidence in themselves and their abilities. However, the gap to be addressed is with transitioning teachers who transitioned from other careers and those who entered alternate route programs. Previous research has found that these teachers lack self-efficacy because of lack of preparation and classroom experience, yet they still must take on the responsibilities of the classroom. The purpose of this qualitative study was to determine the internal factors that drive classroom responsibility for transitioning teachers who have low self-efficacy. In addition …

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The Effects Of Cover Crops And Tillage Method On Sweetpotato [Ipomoea Batatas (L.) Lam.] In North Mississippi., Jeffrey Len Main Dec 2017

The Effects Of Cover Crops And Tillage Method On Sweetpotato [Ipomoea Batatas (L.) Lam.] In North Mississippi., Jeffrey Len Main

Theses and Dissertations

Sweetpotato (Ipomoea batatas (L.) Lam) is a major food resource of much of the world. Sweetpotato production is damaging to the soils in which it is grown due to the nature of production and the condition the soil is left to overwinter. There is potential for future regulation on the production of sweetpotato as related to runoff and nonpoint source pollution as the sediment from runoff erosion is easy to pinpoint in nearby waterways. Two studies were carried out to determine the effect of a reduced tillage practice and cover crops on the accumulation of nutrients in cover crops and …

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Production Of Tempo-Oxidized Cellulose Nanofibers From Cotton Stalks And Its Utilization In Different Industrial Applications, Bhawna Soni Dec 2017

Production Of Tempo-Oxidized Cellulose Nanofibers From Cotton Stalks And Its Utilization In Different Industrial Applications, Bhawna Soni

Theses and Dissertations

Cellulose nanofibers (CNFs) have established widespread attention in various industries with their potential applications. Production of CNFs from agricultural post harvesting wastes has several cost-effective and eco-friendly benefits. The objective of this research was to prepare four different types of CNFs from cotton stalks by different chemical treatments followed by ultra-sonication. CNFs via untreated bleached pulp, sulfuric acid hydrolysis, and TEMPO [(2,2,6,6-tetramethylpiperidin-1-yl) oxy radical]-mediated oxidation process were produced. Physical and chemical properties of these CNFs were investigated by morphological (FE-SEM, AFM), structural (FTIR), and thermal gravimetric analysis (TGA). Developed TEMPO-oxidized cellulose nanofibers (TEMPO-CNFs) were brighter and higher in yields ( …

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