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Letteratura scientifica selezionata sul tema "250103 Colloid and Surface Chemistry"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 13 febbraio 2022

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Articoli di riviste sul tema "250103 Colloid and Surface Chemistry"

1

Hines, Melissa A. "The Chemical Physics of Solid Surfaces, Volume 11, Surface Dynamics Edited by D. P. Woodruff (University of Warwick). Elsevier: Amsterdam. 2003. xvi + 378 pp. $250.00. ISBN 0-444-51437-6." Journal of the American Chemical Society 126, n. 28 (luglio 2004): 8858. http://dx.doi.org/10.1021/ja033668x.

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2

Macfarlane, Ronald D. "Analytical Ultracentrifugation: Techniques and Methods Edited by David J. Scott, Stephen E. Harding, and Arthur J. Rowe (University of Nottingham). Royal Society of Chemistry: Cambridge. 2005. xxiv + 588 pp. $250.00. ISBN 0-85404-547-3." Journal of the American Chemical Society 129, n. 29 (luglio 2007): 9246. http://dx.doi.org/10.1021/ja069738s.

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3

Scheeline, Alexander. "Advances in Atomic Spectroscopy, Volume 7 Edited by Joseph Sneddon (McNeese State University). Elsevier Scientific B. V.: Amsterdam and New York. 2002. xxxii + 406 pp. $250.00. ISBN 0-444-51033-8." Journal of the American Chemical Society 125, n. 24 (giugno 2003): 7479. http://dx.doi.org/10.1021/ja033509d.

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Kirk, Martin L. "Metal Ions in Biological Systems. Volume 39. Molybdenum and Tungsten: Their Roles in Biological Processes Edited by Astrid Sigel and Helmut Sigel (University of Basel). 2002. ix + 810 pp. $250.00. ISBN 0-8247-0765-6." Journal of the American Chemical Society 125, n. 1 (gennaio 2003): 305–6. http://dx.doi.org/10.1021/ja0252633.

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5

Allara, David L. "Handbook of Infrared Spectroscopy of Ultrathin Films By Valeri P. Tolstoy (St. Petersburg State University, Russia), Irina V. Chernyshova (St. Petersburg State Polytechnical University, Russia), and Valeri A. Skryshevsky (Kyiv National Taras Shevchenko University, Ukraine). John Wiley and Sons, Inc.: Hoboken. 2003. xxvi + 710 pp. $250.00. ISBN 0-471-35404-X." Journal of the American Chemical Society 126, n. 47 (dicembre 2004): 15633–34. http://dx.doi.org/10.1021/ja0335770.

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6

Ogata, Naoya. "Surface and Colloid Science". Angewandte Chemie International Edition in English 27, n. 11 (novembre 1988): 1584–85. http://dx.doi.org/10.1002/anie.198815841.

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7

Chrzastowski, Tina. "Information Sources in Surface and Colloid Chemistry". Science & Technology Libraries 9, n. 3 (11 luglio 1989): 75–96. http://dx.doi.org/10.1300/j122v09n03_09.

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8

Kerker, Milton. "Eighteen years of colloid and surface chemistry". Journal of Colloid and Interface Science 150, n. 2 (maggio 1992): 599. http://dx.doi.org/10.1016/0021-9797(92)90230-j.

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9

Kerker, Milton. "Surface and colloid science". Journal of Colloid and Interface Science 107, n. 2 (ottobre 1985): 589. http://dx.doi.org/10.1016/0021-9797(85)90219-x.

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10

Shaw, D. J., e Bernard Costello. "Introduction to colloid and surface chemistry (4th edition)". Tribology International 26, n. 3 (giugno 1993): 222. http://dx.doi.org/10.1016/0301-679x(93)90102-7.

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Più fonti

Tesi sul tema "250103 Colloid and Surface Chemistry"

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 achieving multilayers with different functions. The major measuring technique used within this thesis is the quartz crystal microbalance with dissipation (QCM-D), which measures mass adsorbed on a surface including the trapped solvent and the viscoelastic properties of an adsorbed film. The QCM-D measurements were complemented with an optical technique, dual polarization interferometry (DPI), which measures the change in refractive index and thickness. From these parameters the dry mass and relative water content of the film can be calculated. The Atomic Force Microscopy (AFM) further gave information about forces acting between preadsorbed films. We investigated the effect of salt on synthetic polyelectrolyte poly(allylamine hydrochloride)/poly(sodium 4-styrenesulfonate) built with the LbL technique, thus forming polyelectrolyte multilayers. We concluded that the multilayer build-up was linear and that the internal structure of the multilayer is of a compact and rigid nature. However, the type of rinsing protocol (termination of adsorption by: salt, water and salt first followed by water) has a significant effect on the outer layer of the formed multilayer. Interestingly, the structural changes only applied when poly(allylamine hydrochloride) was at the outermost layer and the most significant when water was used. We suggest that it is only the top layer that swells due to the removal of counterions resulting in increased intrachain repulsion. We further performed two-layer model calculations with the Voight model to confirm the QCM-D results as well as a novel two layer model simulation for the DPI data in order to resolve the thickness. The model calculations were in good agreement with each other thus we concluded that only the outer layer swells for this particular multilayer system. In a related experiment we studied the adsorption of bovine submaxillary mucin (BSM), which has an important mucousal function, to different thiol modified gold surfaces as well as the effect of electrolytes (NaCl, CaCl2, LaCl3) on preadsorbed mucin to a hydrophobic thiol-modified Au surface. The salt induced an expansion at low concentrations; higher concentrations resulted in a compaction. Increasing the valence of the counter ion resultedin a compaction at low concentrations. The structural change of preadsorbed BSM was reversible for NaCl, partially reversible for CaCl2 and irreversible for LaCl3. Interestingly, the swelling of BSM could not be fully understood by using the QCM-D and thus AFM force curves of the same system were taken and the results showed that NaCl does decrease the tail length due to the effective screening of charged sites within the BSM molecule. Increasing the valence resulted in a notable compaction already at very low concentrations suggesting that the ions bind to the anionic sites on BSM. In the last work we attempted to combine the gained knowledge from the previous studies by using the LbL-buildup on an actual commercial health care application. The above-mentioned mutlilayer were used to coat polystyrene wells in order to increase the binding of immunoglobulin (IgG). The main goal was to increase the sensitivity of the conventional enzymelinked immunosorbent spot assay (ELISpot) and subsequently the modified polystyrene wells were used with the ELISpot test with human peripheral blood mononuclear cells (PBMC) to measure the cytokine response. We suggested that the main driving force for adsorption for IgG on a PAH terminated multilayer is electrostatic attraction, whereas on PSS terminated multilayer the driving force is hydrophobic. Further, we suggested that IgG does not overcharge the surface and the linearity of the multilayer build-up is not altered when IgG is incorporated within the multilayer structure. We concluded that the cytokine response (spots) on the built multilayers regardless thickness or adsorbed IgG is significantly less than the regular polyvinyldiene fluoride (PVDF) backed ELISpot wells. We suggested that due to the compact and rigid nature of the PAH/PSS multilayer structure it is unable to form the kind of three-dimensional antibody-binding support found in the PVDF membrane. PSS terminated PAH/PSS multilayer did not induce any cytokine response whereas PAH terminated did, which suggests that PSS totally covers the surface from the cells point of view.
QC20100705

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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 chemistry, wettability and friction, on the other. Fundamental research has been conducted in parallel with more applied research on laboratory and pilot papers. Significant effort has been expended to study the spreading behavior of AKD. The main instrument to characterize the surface chemical composition of AKD and ASA sized papers was X-ray photoelectron spectroscopy (XPS). By combination with time-of-flight secondary ion mass spectrometry (ToF-SIMS) we have been able to determine the lateral distribution and the chemical state of the sizing agent at the paper surface. Combined with contact angle measurements using liquids with different surface tensions, and other methods to analyze the amounts of size in paper, this has enabled us to obtain a deeper knowledge of the sizing mechanisms of AKD and ASA. The results indicate a definitive relationship between the redistribution of AKD at the surface of pilot papers and the drying profile used during papermaking. However, the spreading was not complete, as also seen on a model surface. Further spreading of AKD was shown to occur via surface diffusion in the form of an autophobic monolayer precursor. The spreading rate increased linearly with temperature and showed an inverse proportionality with respect to the melting point of the AKD. This monolayer spreading is relatively slow the diffusion coefficient being of the order 10-11 m2/s. AKD spreading was not hindered by hydrolyzed AKD (ketone) that spread as well. Moreover, AKD spread on the surface of crystalline calcium carbonate. In laboratory papers, the extractives present on CTMP fiber surfaces appeared to have enhanced the spreading of AKD when the fibers were in water. In spite of a slightly lower retention, ASA covered the surface of unfilled and PCC-filled pilot papers to a significantly higher extent than AKD. The ASA sized papers, however demonstrated slightly lower resistance to water. This was attributed to formation of hydrolyzed ASA products. The results obtained confirm the proposed sizing mechanism for ASA, where the hydrolyzed ASA plays a key role. The sizing level of these papers stored wrapped in aluminium foil at 23 °C and 5O %RH was nearly unchanged over prolonged storage time. In contrast, the papers exposed to ambient conditions suffered from sizing loss, most likely due to hydrolysis and migration. The reduction of the sizing degree was higher for the AKD than ASA sized unfilled papers and the catalytic effect of PCC contributed to the hydrolysis of AKD in PCC-filled papers. As expected, the use of sizing agent reduced the surface energy of paper. The higher the sizing degree of paper the lower the surface energy, and thus the higher the resistance to wetting. This was particularly seen in the contact angles with ethylene glycol having a lower surface tension than water. AKD significantly decreased the friction between unfilled papers, whereas ASA had no impact. This difference was attributed to surface chemical composition. Friction reduction for the AKD sized papers started at the AKD coverage normally found in paper produced for low water absorption. As expected, PCC filler increased paper-to-paper friction.
Papper och kartong hydrofoberas (limmas) för att kontrollera spridning och absorption avvattenbaserade tryckfärger och hindra kantinträngning av vattenbaserade vätskor ivätskekartong. Alkylketendimer (AKD) och alkylbärnstensyra anhydrid (ASA) är syntetiskahydrofoberingsmedel som allmänt används under neutrala eller något alkaliska förhållandenvid papperstillverkning.Arbetets övergripande målsättning var att förbättra förståelse för mäldhydrofobering avpapper och kartong med AKD och ASA genom att upprätta ett samband mellanhydrofoberingsmekanism på ena sida och ytkemi hos hydrofoberat papper och dessvätningsförmåga och friktion på den andra sidan. Grundläggande studier parallellt med mertillämpade undersökningar på laboratorie- och pilotpapper har utförts. En betydande strävanhar använts för att studera spridning av AKD. Huvudinstrumentet för att karakterisera kemisksammansättning av ytan av pilotpapper hydrofoberade med AKD och ASA var röntgenfotoelektron spektroskopi (XPS). Genom att kombinera det med sekundär jonmasspektrometri (ToF-SIMS) har lateral fördelning och kemiskt tillstånd av AKD och ASAvid en yta av papper kunnat bestämmas. Kombinerat med mätningar av kontaktvinkel medvätskor med olika ytspänning och andra metoder för att analysera halten avhydrofoberinsgmedel i papper har gjort det möjligt att erhålla djupare kunskap omhydrofoberingsmekanismer av AKD och ASA.Resultaten indikerar en klar koppling mellan omfördelning av AKD på ytan av pilotpapperoch torkningsprofil vid papperstillverkning. Emellertid, spridningen var inte fullständig, vilketvar fallet även på modellytor. Fortsatt spridning av AKD visades ske som ytdiffusion i formav ett autofobiskt monoskikt (precursor film). Spridningshastigheten ökade linjärt medtemperatur och visade omvänd proportionalitet med avseende på AKD:s smältpunkt. Dennamonoskiktspridning är relativt långsam, diffusionshastighet är i storleksordningen 10-11 m2/s.Hydrolyserat AKD (keton) hindrade inte AKD:s spridning utan spred även den. Dessutomspred AKD på ytan av kristallina kalciumkarbonat. I laboratoriepapper är extraktivämnennärvarande på ytor av CTMP fiber och tycktes ha förbättrat AKD:s spridning när fibrerna varunder vatten.ivTrots något lägre retention täckte ASA ytan av icke-fyllda och PCC-fyllda papper tillsignifikant högre grad än AKD. ASA-papperen visade dock något lägre motstånd mot vatten.Detta var hänvisat till bildning av hydrolyserade ASA-produkter. De uppnådda resultatenbekräftar den föreslagna hydrofoberingsmekanismen för ASA, där hydrolyserat ASA spelaren avgörande roll. Hydrofoberingsgraden av papper lagrade inlindade i aluminiumfolie vid23 °C och 50 RH var nästan oändrad över den förlängda lagringstiden. Som motsatsgenomgick papperen som exponerats mot omgivande atmosfärsförhållanden genomgick enminskning av hydrofoberingsgraden, troligen på grund av hydrolys och migrering. Minskningav hydrofoberingsgraden var större för icke-fyllda papper av AKD än av ASA. PCC:skatalytiska effekt bidrog till hydrolys av AKD i PCC-fyllda papper.Som förväntat reducerade användning av hydrofoberingsmedel reducerade ytenergin avpapper. Ju högre hydrofoberingsgrad desto lägre var ytenergin och därmed desto högremotstånd mot vätning. Detta sågs särskilt i kontaktvinklar med etylenglykol som har lägreytspänning än vatten.AKD minskade signifikant friktionen mellan icke-fyllda papper, medan ASA inte hadeinverkan. Denna skillnad hänfördes till skillnad i ytsammansättning. Minskning av friktion förAKD-hydrofoberade papperen påbörjades vid en sådan yttäckning av AKD som är normaltför papper tillverkat för låg vattenabsorption. Som förväntat ökade PCC-fyllmedel friktionenmellan papperen.
QC 20100817

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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 synthesized using photoinduced thiol-ene chemistry in order to afford coatings targeted for marine antifouling applications. By varying the length of the PEG chain, curing chemistry, cross-linker as well as hydrolytical stability, a library of hydrogel coatings was produced. The coatings were subsequently characterized with respect to curing efficiency, thermal and mechanical properties, and aqueous stability. Furthermore, the antifouling properties of coatings were evaluated using in vitro tests with proteins, marine bacteria, and diatoms. As a final test the coatings were evaluated in a four month field test. It was found that coatings comprising longer PEG chains displayed enhanced antifouling performance, compared to shorter PEGs. In addition, the choice of cross-linker, curing chemistry, and hydrolytical stability also affected the properties to a great extent. This thesis further deals with the design of amphiphilic linear dendritic hybrids, with PEG as the hydrophilic block. Using non-toxic 2,2-bis(methylol) propionic acid (bis-MPA) based dendrons, bearing click functional cores (alkyne or allyl) and peripheral hydroxyl groups, as macrointitiators for ring-opening polymerization of ε-caprolactone, a library of star branched materials was afforded. As a final step, click functional (azide or thiol) PEGs were attached using copper(I)-catalyzed azide-alkyne cycloaddition (CuAAC) or thiol-ene click chemistry. The size of the dendrons was varied from generation 0-4, along with variation of both poly(ε-caprolactone) (PCL) length and PEG length. The materials were designed in order to allow a study of the impact of the dendron generation. Finally, the hybrid materials were used for the preparation of micelles, as well as for the formation of honeycomb membranes. The micelles critical micelle concentration, size and drug loading capacity were shown to be highly dependent on the generation of the dendron. The generation of the dendron also had a profound effect on the ability of the hybrid materials to form ordered honeycomb membranes, and hybrid materials of the 3rd generation yielded the most highly ordered membranes.
Ickespecifika interaktioner vid gränsytan, mellan ett syntetiskt material och en vattenbaserad biologisk miljö, kan leda till irreversibel adsorption av proteiner. Detta kan i sin tur leda till oönskade följdeffekter, såsom beväxning på båtskrov eller trigga en immunologisk reaktion. För att motverka dessa effekter har forskare utvecklat så kallade smygmaterial. Denna avhandling behandlar design av nätverk, nanopartiklar och ytor innehållande poly(etylenglykol) (PEG), som är känt för sina smygegenskaper och för att vara icke-toxiskt. Initialt behandlar avhandlingen PEG-baserade nätverk, hydrogeler, syntetiserade med fotoinitierad tiol-enekemi, för användning som beväxningsavvisande beläggningar för marina applikationer. Genom att variera olika parametrar, såsom längden på PEG-kedjan, härdningskemin, tvärbindaren samt den hydrolytiska stabiliteten, byggdes ett bibliotek av hydrogelbeläggningar upp. Hydrogelbeläggningarna karaktäriserades sedan med avseende på härdningseffektivitet, termiska och mekaniska egenskaper, samt hydrolytisk stabilitet. Vidare studerades beläggningarnas avvisande förmåga mot proteiner, bakterier samt kiselalger. Slutligen studerades ytbeläggningarna i ett fyra månader långt fälttest. Av testerna framgick att längre PEG-kedjor gav beläggningar med bättre avvisande förmåga. Dessutom framgick att valet av tvärbindare, härdningskemi samt hydrolytisk stabilitet var av betydelse för beläggningarnas effektivitet. Denna avhandling behandlar vidare design av amfifila linjära dendritiska hybridmaterial, med PEG som den hydrofila delen. Genom att använda icke-toxiska 2,2-bis(metylol)propionsyrabaserade dendroner, med en klickfunktionalitet i kärnan (alkyne eller allyl) och perifera hydroxylgrupper, som makroinitiatorer för ringöppningspolymerisation av ε-kaprolakton byggdes ett bibliotek av material upp. För att göra materialen amfifila, kopplades klickfunktionella PEG-kedjor (azid eller tiol) till kärnan med koppar(I)-katalyserad azid-alkyn cykloadditionskemi alternativt tiol-enekemi. Storleken på dendronerna varierades från generation 0-4, dessutom varierades längden på både poly(ε-kaprolakton)- och PEG-kedjorna. Materialen designades så att inverkan av dendrongenerationen kunde studeras. Slutligen användes dessa hybridmaterial för att framställa miceller samt isoporösa filmer. Micellernas kritiska micellbildningskoncentration, storlek samt förmåga att laddas med läkemedel visade sig vara mycket beroende av dendrongenerationen. Dendrongenerationen visade sig vidare även ha stor inverkan i hybridmaterialens förmåga att självorganisera sig till en isoporös struktur och material av tredje generationen gav de mest välordnade filmerna.
QC 20101125

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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 conventional analytical techniques. Several methods exist to describe separate parts of the system, but few techniques work atambient pressure and have the capacity to conduct real-time analysis at relevant exposure conditions. In this work, attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) in the Kretschmann geometry was successfully employed for systematic studies of metal / polymer interfaces. This technique requires the use of thin metal films deposited on an internal reflection element (IRE). Most studies were performed on aluminium, which is an important structural light-weight material, but also zinc was analysed, being frequently used for corrosion protection of steel. Upon exposure to water and electrolytes, the ATR-FTIR Kretschmann technique was found capable to monitor and to separate early deterioration related processes at the aluminium / polymer interface, including water sorption and transport of ionic species through the polymer film. Other main processes identified were the formation of corrosion products and swelling of the surface-near polymer network. To perform more comprehensive interpretations, a spectro-electrochemical method was further developed for in situ studies of the hidden metal / polymer interfaces. The ATR-FTIR Kretschmann technique was here combined with the complementary acting technique, Electrical Impedance Spectroscopy (EIS). The integrated set-up was able to provide complementary information, with ATR-FTIR Kretschmann being sensitive to the surface-near region and EIS to the whole system. For instance, metal oxidation and delamination processes can be difficult to distinguish by EIS, while on the other hand oxidation and hydration reactions on aluminiumcan be confirmed as IR bands at distinct positions. Delamination and swelling of a polymer both result in negative bands in an IR spectrum, but these processes may be distinguished by EIS as alterations in different frequency regions. While traditional chemical pre-treatments for enhanced hydrolytic stability perform excellent, they are being phased out from industrial applications due to environmental concerns and work health issues. Today there is an intense ongoing research regarding the mechanisms and performance of environmentally friendly pretreatments to develop systems of similar performance, and the analysis of the confined metal / polymer interface is crucial for this development. The capability of the integrated in situ ATR-FTIR Kretschmann and EIS set-up was therefore further applied to systems where a surface pre-treatment had been applied to the metal prior to the organic coating. Studies were first performed on vacuum-evaporated films of zinc treated with a titanium-based conversion coating and further coated with a UV-curing polymer. Alterations of the conversion layer could be detected upon exposure to the electrolyte. Also alkaline-cleaned aluminium coated with an amino-functional silane film and a thermo-curing epoxy top-coat was thoroughlycharacterized by both ATR-FTIR and IRRAS and further investigated upon exposure toelectrolyte and humid air. Changes at the hidden interface were detected upon thermal curingof the epoxy film and during exposure in electrolyte, and the in situ ATR-FTIR Kretschm annanalysis showed a high sensitivity towards alterations in the interfacial region. Complementary studies in the absence of metal could confirm a water uptake within the silane film and water-induced alterations of the siloxane network.
QC 20101222

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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 and protein repellency to name a few. To utilize these materials in a wide range of applications e.g. drug delivery, the understanding of the effects of polymer architecture and solution parameters on the properties of bottle brush PECs is of paramount importance. This thesis constitutes a systematic investigation of PECs formed by a series of cationic bottle-brush polyelectrolytes and a series of anionic linear polyelectrolytes in aqueous solution. The focus of the first part of the thesis was primarily on formation and characterization of PECs in solution, whereas the adsorption properties and adsorption kinetics of bottle-brush polyelectrolytes and their complexes was investigated in the second part of the thesis work. In particular, effects of the side-chain density of the bottlebrush polyelectrolyte, concentration, mixing ratio and molecular weigh of the linearpolyelectrolyte on formation, solution properties, stability and adsorption of PECs were addressed. The pronounced effect of the side-chain density of the bottle-brush polyelectrolyte on the properties of stoichiometric and nonstoichiometric PECs was demonstrated. Formation of PECs by bottle-brush copolymers with high density of side-chains results in small, watersoluble, molecular complexes having nonspherical shape, independent of concentration. Whereas formation of PEC-aggregates was revealed by bottle-brush polyelectrolytes with low side chain density, the level of aggregation in these complexes is controlled by polyelectrolyte concentration. The structure of the PECs formed with low molecular weight polyanions is consistent with the picture that several small linear polyelectrolyte molecules associate with the large bottle-brush. In contrast, when complexation occurs between polyanions of high molecular weigh and the bottle-brush polymers considerably larger PECs are formed, consistent with several bottle-brush polymers associating with one high molecular weight polyanion.
QC 20110516

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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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Abstract (sommario):

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 adsorbed layers. A comparison between some techniques for calibration of the AFM instrument for friction measurements was made to find the most suitably one for colloidal probe friction measurements in aqueous solutions. It is suggested that the normal and torsional Sader methods are preferred in combination with torsional detector sensitivity measurement, for which one new methodology has been proposed. Adsorption was studied for bovine serum albumin, cytochrome c, myoglobin and mucin, whereas conformational changes of the adsorbed layer were monitored only for mucin. It was found that it was essential to take into account bulk density and viscosity changes for correct interpretations of QCM data when studying the effect of changes in electrolyte type and concentration on preadsorbed layers of mucin, and also when having different (high) concentrations of proteins in the measuring solution. The adsorbed amount of proteins appears to depend on the strength of the surface attachment, in such a manner that a too high affinity reduces the adsorbed amount. Friction properties in aqueous solution have been studied for adsorbed layers of PEO45MEMA:METAC co-polyelectrolytes, with varying density of grafted PEO45 side chains and varying charge density, as well as for a naturally occurring polyelectrolyte (chitosan) and the glycoprotein mucin. These polymers were used to cover a wide range of different types of adsorbed layers and interactions to gain a better understanding of friction mechanisms and demands on layer properties for achieving favourable lubrication. It was found that the common features of low friction layers are that no attractive forces are present, and that excluded volume and / or electrostatic forces counteract chain interpenetration under load.
QC 20100903

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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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Libri sul tema "250103 Colloid and Surface Chemistry"

1

Pashley, Richard M., e Marilyn E. Karaman. Applied Colloid and Surface Chemistry. Chichester, UK: John Wiley & Sons, Ltd, 2004. http://dx.doi.org/10.1002/0470014709.

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2

International Conference on Surface and Colloid Science (11th 2003 Iguassu Falls, Brazil). Surface and colloid science. A cura di Galembeck Fernando. Berlin: Springer, 2004.

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3

Introduction to colloid and surface chemistry. 4^a ed. Oxford: Butterworth-Heinemann, 1992.

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4

J, Shaw Duncan, e Biggs Simon, a cura di. Introduction to colloid and surface chemistry. 5^a ed. Oxford: Butterworth-Heinemann, 2007.

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5

Raj, Rajagopalan, a cura di. Principles of colloid and surface chemistry. 3^a ed. New York: Marcel Dekker, 1997.

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6

Principles of colloid and surface chemistry. 2^a ed. New York: M. Dekker, 1986.

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7

author, Kiil Sören, a cura di. Introduction to applied colloid and surface chemistry. Chichester, UK: John Wiley & Sons, 2016.

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8

Birdi, K. S. Surface and colloid chemistry: Principles and applications. Boca Raton: Taylor & Francis, 2010.

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9

Kontogeorgis, Georgios M., e Søren Kiil. Introduction to Applied Colloid and Surface Chemistry. Chichester, UK: John Wiley & Sons, Ltd, 2016. http://dx.doi.org/10.1002/9781118881194.

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Surface and colloid chemistry: Principles and applications. Boca Raton: Taylor & Francis, 2010.

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Capitoli di libri sul tema "250103 Colloid and Surface Chemistry"

1

Abe, Masahiko. "Basics of Surface Chemistry". In Measurement Techniques and Practices of Colloid and Interface Phenomena, 1–11. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-5931-6_1.

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2

Fukushima, Shoji, e Michihiro Yamaguchi. "Physical Chemistry of Cetyl Alcohol: Occurrence and Function of Liquid Crystals in O/W Creams". In Surface and Colloid Science, 1–98. Boston, MA: Springer US, 2001. http://dx.doi.org/10.1007/978-1-4615-1223-3_1.

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3

Biermann, Christopher J. "Colloid and Surface Chemistry". In Handbook of Pulping and Papermaking, 421–37. Elsevier, 1996. http://dx.doi.org/10.1016/b978-012097362-0/50025-x.

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"Colloid and Surface Chemistry:". In Principles of Colloid and Surface Chemistry, 1–61. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 1997. http://dx.doi.org/10.1201/9781315274287-2.

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5

Bajpai, Pratima. "Colloid and Surface Chemistry". In Biermann's Handbook of Pulp and Paper, 381–400. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-12-814238-7.00019-2.

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"Surface and Colloid Chemistry". In Handbook of Surface and Colloid Chemistry, 15–58. CRC Press, 2008. http://dx.doi.org/10.1201/9781420007206-5.

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7

Birdi, K. "Surface and Colloid Chemistry". In Handbook of Surface and Colloid Chemistry, Third Edition, 1–43. CRC Press, 2008. http://dx.doi.org/10.1201/9781420007206.ch1.

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8

Adair, J. H., E. Suvaci e J. Sindel. "Surface and Colloid Chemistry". In Encyclopedia of Materials: Science and Technology, 1–10. Elsevier, 2001. http://dx.doi.org/10.1016/b0-08-043152-6/01622-3.

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9

Shaw, Duncan J. "Colloid stability". In Introduction to Colloid and Surface Chemistry, 210–43. Elsevier, 1992. http://dx.doi.org/10.1016/b978-0-08-050910-5.50012-8.

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10

"Surface Chemistry". In Encyclopedia of Surface and Colloid Science, 2004 Update Supplement, 663–76. CRC Press, 2014. http://dx.doi.org/10.1201/9781482299625-39.

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Atti di convegni sul tema "250103 Colloid and Surface Chemistry"

1

Chen, Kok Hao, e Jong Hyun Choi. "DNA Oligonucleotide-Templated Nanocrystals: Synthesis and Novel Label-Free Protein Detection". In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11958.

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Semiconductor and magnetic nanoparticles hold unique optical and magnetic properties, and great promise for bio-imaging and therapeutic applications. As part of their stable synthesis, the nanocrystal surfaces are usually capped by long chain organic moieties such as trioctylphosphine oxide. This capping serves two purposes: it saturates dangling bonds at the exposed crystalline lattice, and it prevents irreversible aggregation by stabilizing the colloid through entropic repulsion. These nanocrystals can be rendered water-soluble by either ligand exchange or overcoating, which hampers their widespread use in biological imaging and biomedical therapeutics. Here, we report a novel scheme of synthesizing fluorescent PbS and magnetic Fe3O4 nanoparticles using DNA oligonucleotides. Our method of PbS synthesis includes addition of Na2S to the mixture solution of DNA sequence and Pb acetate (at a fixed molar ratio of DNA/S2−/Pb2+ of 1:2:4) in a standard TAE buffer at room temperature in the open air. In the case of Fe3O4 particle synthesis, ferric and ferrous chloride were mixed with DNA in DI water at a molar ratio of DNA/Fe2+/Fe3+ = 1:4:8 and the particles were formed via reductive precipitation, induced by increasing pH to ∼11 with addition of ammonium hydroxide. These nanocrystals are highly stable and water-soluble immediately after the synthesis, due to DNA termination. We examined the surface chemistry between oligonucleotides and nanocrystals using FTIR spectroscopy, and found that the different chemical moieties of nucleobases passivate the particle surface. Strong coordination of primary amine and carbonyl groups provides the chemical and colloidal stabilities, leading to high particle yields (Figure 1). The resulting PbS nanocrystals have a distribution of 3–6 nm in diameter, while a broader size distribution is observed with Fe3O4 nanoparticles as shown in Figure 1b and c, respectively. A similar observation was reported with the pH change-induced Fe3O4 particles of a bimodal size distribution where superparamagnetic and ferrimagnetic magnetites co-exist. In spite of the differences, FTIR measurements suggest that the chemical nature of the oligonucleotide stabilization in this case is identical to the PbS system. As a particular application, we demonstrate that aptamer-capped PbS QD can detect a target protein based on selective charge transfer, since the oligonucleotide-templated synthesis can also serve the additional purpose of providing selective binding to a molecular target. Here, we use thrombin and a thrombin-binding aptamer as a model system. These QD have diameters of 3∼6 nm and fluoresce around 1050 nm. We find that a DNA aptamer can passivate near IR fluorescent PbS nanocrystals, rendering them water-soluble and stable against aggregation, and retain the secondary conformation needed to selectively bind to its target, thrombin, as shown in Figure 2. Importantly, we find that when the aptamer-functionalized nanoparticles binds to its target (only the target), there is a highly systematic and selective quenching of the PL, even in high concentrations of interfering proteins as shown in Figure 3a and b. Thrombin is detected within one minute with a detection limit of ∼1 nM. This PL quenching is attributed to charge transfer from functional groups on the protein to the nanocrystals. A charge transfer can suppress optical transition mechanisms as we observe a significant decrease in QD absorption with target addition (Figure 3c). Here, we rule out other possibilities including Forster resonance energy transfer (FRET) and particle aggregation, because thrombin absorb only in the UV, and we did not observe any significant change in the diffusion coefficient of the particles with the target analyte, respectively. The charge transfer-induced photobleaching of QD and carbon nanotubes was observed with amine groups, Ru-based complexes, and azobenzene compounds. This selective detection of an unlabeled protein is distinct from previously reported schemes utilizing electrochemistry, absorption, and FRET. In this scheme, the target detection by a unique, direct PL transduction is observed even in the presence of high background concentrations of interfering negatively or positively charged proteins. This mechanism is the first to selectively modulate the QD PL directly, enabling new types of label free assays and detection schemes. This direct optical transduction is possible due to oligonucleotidetemplated surface passivation and molecular recognition. This chemistry may lead to more nanoparticle-based optical and magnetic probes that can be activated in a highly chemoselective manner.

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Rapporti di organizzazioni sul tema "250103 Colloid and Surface Chemistry"

1

Powers, Susan E. Characterization of Changes in Colloid and DNAPL Affecting Surface Chemistry and Remediation. Office of Scientific and Technical Information (OSTI), giugno 2003. http://dx.doi.org/10.2172/839338.

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2

Powers, Susan E., Stefan J. Grimberg e Miles Denham. DOE-EMSP Final Report: Characterization of Changes in Colloid and DNAPL Affecting Surface Chemistry and Remediation. Office of Scientific and Technical Information (OSTI), febbraio 2007. http://dx.doi.org/10.2172/899135.

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3

Olson, T. M. Surface chemistry investigation of colloid transport in packed beds. Final report, August 1, 1989--July 31, 1996. Office of Scientific and Technical Information (OSTI), dicembre 1996. http://dx.doi.org/10.2172/656472.

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