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Dissertations / Theses on the topic '250103 Colloid and Surface Chemistry'

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Published: 4 June 2021

Last updated: 13 February 2022

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1

Freitas, Alexandre Mussumeci. "Role of acid-base interactions in colloid adhesion and stability of aqueous thin films /." Digital version accessible at:, 1998. http://wwwlib.umi.com/cr/utexas/main.

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2

Feldötö, Zsombor. "Structures of Polyelectrolyte Multilayers and Preasorbed Mucin : The Influence of Counterions." Doctoral thesis, KTH, Yt- och korrosionsvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-13182.

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The focus in this thesis has been to gain a fundamental understanding of how different type of salts affect preadsorbed polyelectrolytes, both natural and synthetic. The knowledge from the fundamental work is then applied on a commercial system to investigate if the efficiency can be enhanced. We built thin films using the synthetic polyelctrolytes by using layer-by layer (LbL) deposition. The formed film is commonly known as a polyelectrolyte multilayer. The LbL method allows the incorporation of proteins, polymers, polyelectrolytes with different functions and so on within the film, thus ach

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3

Seppänen, Rauni. "On the Internal Sizing Mechanisms of Paper with AKD and ASA Related to Surface Chemistry, Wettability and Friction." Doctoral thesis, KTH, Kemi, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4537.

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Paper and board are hydrophobized (sized) to control the spreading and absorption of waterbased inks and retard the absorption and edge penetration of liquid packaging by aqueous liquids. Alkenyl ketene dimers (AKD) and alkenyl succinic anhydride (ASA) are synthetic sizing agents that are generally used under neutral or slightly alkaline papermaking conditions. The overall objective of this thesis is to improve understanding of the internal sizing of paper and board by AKD and ASA by establishing a link between the sizing mechanism on one hand, and properties of sized papers, such as surface c

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4

Lundberg, Pontus. "Designing Polymers for Biological Interfaces - From Antifouling to Drug Delivery." Doctoral thesis, KTH, Ytbehandlingsteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26413.

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Unspecific interactions, at the interface between a synthetic material and an aqueous biological environment, leading to irreversible protein adsorption can cause to undesired consequences. These include fouling of a boat hull or a triggered immune response. Thus, stealthy materials are a topic that has generated a great deal of interest in the scientific community. This work deals with the design of networks, nanoparticles, and surfaces containing poly(ethylene glycol) (PEG), known for its resistance to protein adsorption and non-toxic nature. Initially, PEG-based networks, hydrogels, were sy

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5

Öhman, Maria. "Development of ATR-FTIR Kretschmann Spectroscopy for In situ Studies of Metal / Polymer Interfaces : and its Intergration with EIS for Exposure to Corrosive Conditions." Doctoral thesis, KTH, Korrosionslära, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-26996.

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The environmental stability of a metal / polymer interface is essential for the durability and mechanical stability of constructions in several important areas such as the automotive, offshore, building and aerospace industries. The protective capability of a polymer film is strongly connected to its barrier properties, but the transport of water and corrosive constituents through the polymer and the subsequent processes at the metal surface are complicated to analyse in detail. The surface to be analysed is confined between two media that are impermeable to most probing particles used in conv

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6

Alexander, Shovsky. "Polyelectrolyte complexes of bottle brush copolymers : Solution and adsorption properties." Doctoral thesis, KTH, Yt- och korrosionsvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-33666.

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The aim of this thesis work was to systematically investigate the physico-chemical properties of polyelectrolyte complexes (PECs) formed by bottle brush and linear polyelectrolytes in solution and at solid / liquid interfaces. Electrostatic self-assembly of oppositely charged macromolecules in aqueous solution is a versatile strategy to construction of functional nanostructures with easily controlled properties. Bottle brush architecture, introduced into the PEC, generates a number of distinctive properties of the complexes, related to a broad range of application, such as colloidal stability

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7

Stiernstedt, Johanna. "Interactions of cellulose and model surfaces." Doctoral thesis, Stockholm : Chemical Science and Engineering, KTH, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-619.

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8

Theander, Katarina. "Studies of surfactant behaviour and model surfaces relevant to flotation deinking." Doctoral thesis, Stockholm : Stockholm : Chemical Science and Engineering, KTH ; Ytkemiska institutet (YKI), 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-602.

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9

Pettersson, Torbjörn. "Lubrication and Surface Properties of Adsorbed Layers of Polyelectrolytes and Proteins." Doctoral thesis, KTH, Ytkemi, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4663.

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Friction forces between protein / polyelectrolyte layers, adsorption properties of proteins, and conformational changes due to variation in electrolyte concentration have been investigated. The aim was to obtain better understanding of adsorbed layer properties, with focus on the relation between layer structure and lubrication capabilities. The major techniques used were AFM (atomic force microscope) with colloidal probe for normal force and friction measurements together with QCM-D (quartz crystal microbalance with dissipation) for measurement of adsorption and conformational changes of adso

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10

Rentzhog, Maria. "Water-based Flexographic Printing on Polymer-coated Board." Doctoral thesis, Stockholm : Chemical Science Engineering, KTH, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-603.

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11

Voltaire, Joakim. "Ink Film Splitting Acoustics in Offset Printing." Doctoral thesis, Stockholm : Chemical Science and Engineering, KTH, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3869.

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12

Davis, Christina Clarkson. "Aqueous Silica in the Environment: Effects on Iron Hydroxide Surface Chemistry and Implications for Natural and Engineered Systems." Thesis, Virginia Tech, 2000. http://hdl.handle.net/10919/33948.

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Aqueous silica is present in all natural waters and exhibits a high affinity for the surfaces of iron oxides. Therefore, it is expected to play an important role in environmental systems. Experiments were conducted to investigate the fundamentals of silica sorption onto pre-formed ferric hydroxide at pH 5.0-9.5 and silica concentrations of 0-200 mg/L as SiO<sub>2</sub>. Over the entire pH range studied, sorption densities exceeding monolayer sorption were observed at silica levels typical of natural waters. Under some circumstances, sorption exceeded a monolayer while the particle zeta pot

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13

García, García Sandra. "Generation, stability and migration of montmorillonite colloids in aqueous systems." Doctoral thesis, KTH, Kemiteknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11847.

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In Sweden the encapsulated nuclear waste will be surrounded by compacted bentonite in the granitic host rock. In contact with water-bearing fractures the bentonite barrier may release montmorillonite colloids that may be further transported in groundwater. If large amounts of material are eroded from the barrier, the buffer functionality can be compromised. Furthermore, in the scenario of a leaking canister, strongly sorbing radionuclides, can be transported by montmorillonite colloids towards the biosphere. This thesis addresses the effects of groundwater chemistry on the generation, stabilit

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14

Mira, Isabel. "Interactions between surfactants and starch : from starch granules to amylose solutions." Doctoral thesis, Stockholm : Chemical Science and Engieering, KTH : Ytkemiska institutet, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4123.

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15

Dahlberg, Carina. "Drugs and polymers in dissolving solid dispersions : NMR imaging and spectroscopy." Doctoral thesis, Stockholm : Skolan för teknikvetenskap, Kungliga Tekniska högskolan, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11783.

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16

Kong, Moreno Maynard J. "Principles of colloid and surface chemistry. Paul C. Hiemenz y Raj Rajagopalan. Marcel Dekker, Inc. 3th edición. Nueva York, 1997. 650 págs." Revista de Química, 2013. http://repositorio.pucp.edu.pe/index/handle/123456789/101337.

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17

Ulrich, Christian. "Electric Fields for Surface Design and Chemical Analysis." Doctoral thesis, Linköpings universitet, Tillämpad Fysik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-12485.

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This thesis deals with the use of electric fields for evaluation and control of chemical systems. An electric field can result in the flow of charge across an interface between a metal and a solution, by means of chemical reactions. This interplay between electricity and chemistry, i.e. electrochemistry, is a field of crucial importance both within research and industry. Applications based on electrochemical principles encompass such diverse areas as batteries and fuel cells, pH electrodes, and the glucose monitor used by people suffering from diabetes.A major part of the present work concerns

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18

McCardy, Nicole R. "Prediction of Surfactant Mildness for Rinse-off Formulations Using Preclinical Assays." University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1468512440.

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19

Herting, Gunilla. "Bioaccessibility of Stainless Steels : Importance of Bulk and Surface Features." Doctoral thesis, KTH, Korrosionslära, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4773.

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With increasing environmental awareness, the desire to protect human beings and the environment from adverse effects induced by dispersed metals has become an issue of great concern and interest. New policies, such as REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals) within the European Community, have been implemented to reduce hazards posed by the use of chemicals on producers and downstream users. The generation of exposure assessment data and relevant test procedures able to simulate realistic scenarios are essential in such legislative actions. This doctoral stu

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20

Halthur, Tobias. "Multilayer Structures for Biomaterial Applications : Biomacromolecule-based Coatings." Doctoral thesis, KTH, Chemistry, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-551.

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<p>The cellular response to a biomaterial, such as a dental implant, is mainly governed by the surface properties, and can thus be altered by the introduction of a surface coating. In this thesis the buildup of a biomacromolecule-based coating formed by layerby-layer (LbL) deposition of the charged polypeptides poly(L-lysine) (PLL) and poly(L-glutamic acid) (PGA) has been studied. In an attempt to make these coatings bioactive and useful for bone-anchored implants, an amelogenin protein mixture (EMD), has been immobilized in these thin polyelectrolyte multilayer (PEM) films. Multilayers were a

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21

Petru, Niga. "Self Assembly at the Liquid Air Interface." Doctoral thesis, KTH, Yt- och korrosionsvetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12865.

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The aim of this work is to study the interfacial properties of amphiphilic compounds at the liquid–air interface in an attempt to develop a comprehensive understanding of their orientation as well as the influence of their interaction with the solvent on the interfacial layer properties. Using Vibrational Sum Frequency Spectroscopy (VSFS) as the main tool, the molecular structure of the amphiphilic layer and the amphiphile–solvent relation can be illuminated in great detail – it is arguably the most sensitive surface spectroscopy currently available. Due to its second order nature, the VSFS te

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22

Liljeblad, Jonathan F. D. "Biomimetic Membranes: : Molecular Structure and Stability Studies by Vibrational Sum Frequency Spectroscopy." Licentiate thesis, KTH, Surface and Corrosion Science, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-24465.

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<p>In the research presented in this licentiate thesis the surface specific technique Vibrational Sum Frequency Spectroscopy, VSFS, combined with the Langmuir trough has been utilized to investigate Langmuir monolayers and Langmuir-Blodgett (LB) deposited mono- and bilayers of phospholipids. Their molecular structure, stability, and hydration were probed to gain additional understanding of important properties aiming at facilitating the use of such layers as model systems for biological membranes.</p><p>VSFS was applied to <em>in situ</em> studies of the degradation of Langmuir monolayers of 1

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23

Tyrode, Eric. "Vibrational Sum Frequency Spectroscopy Studies at the Air-Liquid Interface." Doctoral thesis, KTH, Chemistry, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-440.

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<p>In this thesis the structure and hydration of small organic and amphipilic compounds adsorbed at the air-liquid interface, have been studied using the nonlinear optical technique Vibrational Sum Frequency Spectroscopy (VSFS). The second order nature of the sum frequency process makes this technique particularly surface sensitive and very suitable for interfacial studies, as molecules at the surface can be distinguished even in the presence of a vast excess of the same molecules in the bulk. Particular emphasis was given to the surface water structure and how it is affected by the presence o

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24

Wallqvist, Viveca. "Interactions between non-polar surfaces in water: Fokus on talc, pitch and surface roughness effects." Doctoral thesis, KTH, Ytkemi, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10283.

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The aim of this thesis work was to gain understanding of the interactions between talc mineral and surfaces, liquids and chemicals relevant for industrial applications, such as pulp and paper. Talc is used in the pulp and paper industry as a filler pigment, in control of pitch (lipophilic extractives) deposits and as a coating pigment. A deeper understanding of talc interactions will be beneficial in optimizing its use. Long-range attractive interactions between talc and hydrophobic model probes, as well as pitch probes, have been measured using the atomic force microscope (AFM) colloidal prob

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25

Bastardo, Zambrano Luis Alejandro. "Self assembly of surfactants and polyelectrolytes in solution and at interfaces." Doctoral thesis, KTH, Ytkemi, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-425.

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This thesis focuses on the study of the interactions between polyelectrolytes and surfactants in aqueous solutions and at interfaces, as well as on the structural changes these molecules undergo due to that interaction. Small–angle neutron scattering, dynamic, and static light scattering were the main techniques used to investigate the interactions in bulk. The first type of polymer studied was a negatively charge glycoprotein (mucin); its interactions with ionic sodium alkyl sulfate surfactants and nonionic surfactants were determined. This system is of great relevance for several application

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26

Kivisäkk, Ulf. "Influence of hydrogen on corrosion and stress induced cracking of stainless steel." Doctoral thesis, KTH, Korrosionslära, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-12436.

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Hydrogen is the smallest element in the periodical table. It has been shown in several studies that hydrogen has a large influence on the corrosion and cracking behaviour of stainless steels. Hydrogen is involved in several of the most common cathode reactions during corrosion and can also cause embrittlement in many stainless steels. Some aspects of the effect of hydrogen on corrosion and hydrogen-induced stress cracking, HISC, of stainless steels were studied in this work. These aspects relate to activation of test specimens for uniform corrosion testing, modification of a test cell for dewp

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27

Matsson, Maria. "Adsorption of polyhydroxyl based surfactants." Doctoral thesis, KTH, Chemistry, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-421.

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<p>Adsorption on solid surfaces from solution is a fundamental property of a surfactant. It might even be the most important aspect of surfactant behavior, since it influences many applications, such as cleaning, detergency, dispersion, separation, flotation, and lubrication. Consequently, fundamental investigations of surfactant adsorption are relevant to many areas.</p><p>The main aim of this thesis has been to elucidate the adsorption properties, primarily on the solid/water interface, of a particular class of polyhydroxyl based surfactants: the alkyl glucosides. By the use of ellipsometry,

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28

Moore, Lee James. "Spectroscopy and dynamics of colloidal particles and systems at interfaces." Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:80b11157-18d9-4262-9432-c7fe82e24213.

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This thesis presents an investigation of the dynamic properties of wide range of interfacial systems, from colloidal particles in solution, through the realm of aerosols and onto studies of molecular adsorption at an interface. The primary experimental technique utilized is optical tweezers. An exploration of the history of the use of radiation pressure to manipulate matter is presented, followed by an introduction to how optical tweezers work. Some of the more advanced methods of tweezing are discussed, with an emphasis on the use of spatial light modulators (SLMs) to realise dynamic holograp

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29

Iruthayaraj, Joseph. "Poly (ethylene oxide) based bottle-brush polymers and their interaction with the anionic surfactant sodium dodecyl sulphate : solution and interfacial properties /." Doctoral thesis, Stockholm : Kemi, Chemistry, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4680.

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30

Naderi, Ali. "Polyelectrolytes : Bottle-Brush Architectures and Association with Surfactants." Doctoral thesis, Stockholm : Kemi, Chemistry, Kungliga Tekniska högskolan, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4683.

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31

Midander, Klara. "Metal Particles – Hazard or Risk? Elaboration and Implementation of a Research Strategy from a Surface and Corrosion Perspective." Doctoral thesis, Stockholm : Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11695.

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32

Lundin, Maria. "Adsorption of biopolymers and their layer-by-layer assemblies on hydrophilic surfaces." Doctoral thesis, KTH, Yt- och korrosionsvetenskap, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11058.

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It is widely known that surfaces play an important role in numerous biological processes and technological applications. Thus, being able to modify surface properties provides an opportunity to control many phenomena occurring at interfaces. One way of controlling surface properties is to adsorb a polymer film onto the surface, for example through layer-by-layer (LbL) deposition of polyelectrolytes. This simple but versatile technique enables various polymers, proteins, colloidal particles etc. to be incorporated into the film, resulting in a multifunctional coating. Due to recent legislations

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33

Barnes, Timothy. "Emulsion droplets of controlled deformability: electrokinetics, colloid stability and polymer adsorption." 2003. http://arrow.unisa.edu.au:8081/1959.8/28912.

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Emulsions are commonly found both in nature and industry. Due to the complex nature of emulsion systems, their interfacial properties and stability are poorly understood, particularly the influence of droplet deformability on the colloid and interfacial behaviour. This study has highlighted the role of emulsion droplet cross-linking (deformability and penetrability) on droplet surface chemistry, droplet colloidal stability and adsorption at the droplet-water interface and provides insight into methods for enhancing the performance of emulsion formulations.

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34

Jiang, Xiuqian. "Gold nanoparticles for biosensor development : a thesis presented in partial fulfillment of the degree of Doctor of Philosphy in Chemistry, Institute of Fundamental Science, Massey University, Palmerston North, New Zealand." 2009. http://hdl.handle.net/10179/1376.

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Gold nanoparticles, are one of the most widely investigated nanoparticles (NP) and are normally synthesized by the reduction of metal salts in citrate solution. The reason for studying this nanostructured material from a technological standpoint is mainly the anticipated application in different areas based on optical properties explained with plasmon resonance. The main work of this study was to develop different sensing systems using gold nanoparticles. Three techniques have been utilized, being lateral flow immunoassay (LFIA), surface plasmon resonance (SPR), and surface-enhanced Raman scat

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35

Djordjevic, Ivan. "Polyoctanediol citrate/sebacate elastomers : a new class of tissue engineering materials." 2009. http://arrow.unisa.edu.au:8081/1959.8/92562.

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The thesis focuses on elastic polymer material that is biodegradable and compatible with human cells and tissues. The presented research describes polymer synthesis, material processing, physico-chemical investigation and biological tests performed on this novel biomaterial.

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Sedeva, Iliana. "Probing the adsorption of polymer depressants on hydrophobic surfaces using the quartz crystal microbalance." 2010. http://arrow.unisa.edu.au:8081/1959.8/92477.

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The hydrophobicity of a surface is an important property in many areas of science and engineering. This is especially the case in mineral processing, where differences in surface hydrophobicity lie at the heart of the separation process of flotation. Chemicals are used to increase and decrease the natural hydrophobicity of minerals to attain a better separation between valuable and worthless material. Polymers are often used to reduce mineral surface hydrophobicity. Decades of empirically based decision making have produced a list of effective depressants. However the detailed study of how the

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37

Zhou, Jingfang. "Thymine-functionalized gold nanoparticles : synthesis, surface structure and colloid stability." 2008. http://arrow.unisa.edu.au:8081/1959.8/47049.

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Monolayer protected nanoparticles (MPNs) display fascinating size-dependent electronic, optical and catalytic properties. They are promising candidates to be used as building blocks with which to construct new generation nanoarchitectures and nanodevices for sensing, electronic and optoelectronic applications. The aggregation and dispersion of colloidal nanoparticles is one of the key issues closely related to their potential applications. Our knowledge of the colloid stability of nanoparticle dispersions with small sizes is still in its infancy, however, thymine is one of the bases in DNA, an

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Clasohm, Lucy Y. "A surface force apparatus study of the mercury/water interface with and without self-assembled monolayers." 2005. http://arrow.unisa.edu.au:8081/1959.8/45956.

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The surface force apparatus (SFA) has been an important technique for making direct force measurements and has contributed enormously to our understanding of colloidal interactions. The conventional SFA has been limited to measuring forces between solid surfaces, until recently when a modified SFA was developed at the Ian Wark Research Institute [1]. A fluid drop (mercury) is introduced into the apparatus which allows a range of deformable surfaces to be studied in the SFA. This project is an extension of this technique. Interactions between a mica sheet and a mercury drop are studied, includi

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Snoswell, David Robert Evan. "The influence of surface heterogeneity and solution composition on the colloid stability of SiO2 and TiO2 dispersions." 2003. http://arrow.unisa.edu.au:8081/1959.8/80906.

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Hydrophobic colloidal suspensions are common in nature and industry. DLVO theory has been used to model the interactions between colloidal particles for decades, however the origin of long-ranged attractive forces observed between hydrophobic colloids remains the subject of much debate. In an effort to understand these forces and improve the prediction of colloidal stability, the colloidal stability of synthetic silica and titania was studied at various concentrations of dissolved gas, KCl electrolyte and pH.<br>Thesis (PhD)--University of South Australia, 2003

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(9182480), Kent Douglas Shilts. "DEVELOPING A CELL-LIKE SUBSTRATE TO INVESTIGATE THE MECHANOSENSITIVITY OF CELL-TO-CELL JUNCTIONS." Thesis, 2020.

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<p>The role of mechanical forces in the fate and function of adherent cells has been revealed to be a pivotal factor in understanding cell biology. Cells require certain physical cues to be present in their microenvironment or the cell will begin apoptosis. Mechanical signals from the environment are interpreted at the cellular level and biochemical responses are made due to the information from outside the cell, this process is known as mechanotransduction. Misinterpretation of physical cues has been indicated in many disease states, including heart disease and asthma. When a cell is bound to

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(9121889), Tyson C. Davis. "Controlled Transfer Of Macroscopically Organized Nanoscopically Patterned Sub–10 nm Features onto 2D Crystalline and Amorphous Materials." Thesis, 2020.

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<div>Surface level molecules act as an interface that mediates between the surface and the environment. In this way, interfacial molecules are responsible for conferring characteristics of relevance to many modern material science problems, such as electrical conductivity and wettability. For many applications, such as organic photovoltaics and nanoelectronics, macroscopic placement of chemical patterns at the sub-10 nm must be achieved to advance next generation device applications.</div><div><br></div><div>In the work presented here, we show that sub-10 nm orthogonal features can be prepared

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(7010366), Edwin Jhovany Alzate Rodriguez. "POLYMERIC BONDED PHASES FOR PROTEIN EXTRACTION AND INTACT GLYCOPROTEIN ANALYSIS." Thesis, 2019.

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Polymer brushes are extremely versatile materials, as monomer choice allows the user to design a material with the desired physiochemical properties. Given the wide variety in monomer functionality, polymers can be fine-tuned for a specific application. In this work, polymer brushes bound to a silica support are designed and utilized to enhance performance of protein extraction and chromatographic separations. <br> The effectiveness of an analytical method is strongly affected by matrix composition, however, the presence of species other than the target analyte is usually unavoidable. An ex

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Denman, John A. "The application of time-of-flight secondary ion mass spectrometry (ToF-SIMS) to forensic glass analysis and questioned document examination." 2007. http://arrow.unisa.edu.au:8081/1959.8/40576.

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The combination of analytical sensitivity and selectivity provided by time-of-flight secondary ion mass spectrometry (ToF-SIMS), with advanced statistical interrogation by principal component analysis (PCA), has allowed a significant advancement in the forensic discrimination of pen, pencil and glass materials based on trace characterisation.

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(5929496), Jae Jin Bang. "Tailoring Nanoscopic and Macroscopic Noncovalent Chemical Patterns on Layered Materials at Sub-10 nm Scales." Thesis, 2018.

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<p></p><p></p><p>The unprecedented properties of 2D materials such as graphene and MoS2 have been researched extensively [1,2] for a range of applications including nanoscale electronic and optoelectronic devices [3–6]. Their unique physical and electronic properties promise them as the next generation materials for electrodes and other functional units in nanostructured devices. However, successful incorporation of 2D materials into devices entails development of high resolution patterning techniques that are applicable to 2D materials. Patterning at the sub-10 nm scale is particularly of gre

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Gellner, Magdalena. "Plasmonisch aktive Kern/Schale-Nanopartikel für die oberflächenverstärkte Raman-Spektroskopie." Doctoral thesis, 2012. https://repositorium.ub.uni-osnabrueck.de/handle/urn:nbn:de:gbv:700-2012030810053.

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In der vorliegenden Dissertation werden verschiedene plasmonisch aktive Kern/Schale- Nanopartikel synthetisiert, experimentell und theoretisch charakterisiert und in analytischen Anwendungen der oberflächenverstärkten Raman-Spektroskopie (engl. surface-enhanced Raman scattering, SERS) eingesetzt. Es werden die optischen Eigenschaften von Gold/Silber-Nanoschalen mit durchstimmbaren Plasmonbanden behandelt. Motivation dafür ist die Frage nach optimalen SERS-Markern für die rote Laseranregung (λ = 632.8 nm). In SERS-Anwendungen gibt es die Möglichkeit mehrere Marker-Moleküle auf die Oberfläche d

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46

(5929808), Rachel E. Jacobson. "HILIC-MS analysis of protein glycosylation using nonporous silica." Thesis, 2019.

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The objective of this research is to develop and apply a HILIC UHPLC stationary phase that allows for separation of intact glycoproteins. In Chapter 1 I give an overview of the problems of current glycosylation profiling with regards to biotherapeutics, and my strategy to separate the intact glycoprotein with HILIC. Chapter 2 describes the methods used to produce the nonporous packing material and stationary phase. In Chapter 3 I describe previous work in developing a HILIC polyacrylamide stationary phase, and further improvements I have made. Chapter 4 describes development of an assa

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(6630413), Aashutosh Mistry. "Mesoscale Interactions in Porous Electrodes." Thesis, 2019.

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Despite the central importance of porous electrodes to any advanced electrochemical system, there is no clear answer to “<i>How to make the best electrode</i>?”. The source of ambiguity lies in the incomplete understanding of convoluted material interactions at smaller – difficult to observe length and timescales. Such mesoscopic interactions, however, abide by the fundamental physical principles such as mass conservation. The porous electrodes are investigated in such a physics-based setting to comprehend the interplay among structural arrangement and off-equilibrium processes. As a result, a

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He, Mingzhao. "The influence of adsorbed polymer on clay and copper mineral particles' interactions." 2009. http://arrow.unisa.edu.au:8081/1959.8/69122.

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Attractive particle interactions which lead to the hetero-aggregation or 'sliming' of silicate clay gangue and valuable sulphide mineral particles are encountered in a number of hydrometallurgical and flotation processes. Sliming leads to poor recovery of the valuable minerals and high recovery of the clay gangue minerals in flotation concentrates. In the present work, the hetero-aggregation mechanism of hydrophilic mica clay mineral sericite (or muscovite) and hydrophobic chalcocite was investigated by probing the particle interactions and the prevailing interfacial chemistry under dispersion

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