Relevant bibliographies by topics / Supramolecular transport

Academic literature on the topic 'Supramolecular transport'

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Published: 4 June 2021
Last updated: 31 January 2023

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Journal articles on the topic "Supramolecular transport"

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Zhang, Jie, Ling Qiu, Linshan Liu, Yang Liu, Peng Cui, Fang Wang, and Zhuxia Zhang. "Photoelectrochemical Response Enhancement for Metallofullerene-[12]Cycloparaphenylene Supramolecular Complexes." Nanomaterials 12, no. 9 (April 20, 2022): 1408. http://dx.doi.org/10.3390/nano12091408.

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The photoelectrochemical properties of three metallofullerene-[12]cycloparaphenylene ([12]CPP) supramolecular complexes of Sc3N@C78⊂[12]CPP, Sc3N@C80⊂[12]CPP, and Sc2C2@C82⊂[12]CPP were studied. It was revealed that the photocurrent responses of these supramolecular complexes show enhancement compared with those of pristine metallofullerenes, indicating the efficient photocurrent generation and promoted charge carrier transport caused by the supramolecular interaction. The results show that Sc2C2@C82 and Sc2C2@C82⊂[12]CPP have the strongest photocurrents. Then, by comparing the photocurrent intensities of the metallofullerene-biphenyl derivates mixture and the metallofullerene⊂[12]CPP complexes, it was demonstrated that the host–guest interaction is the key factor promoting photocurrent enhancement. At the same time, by observing the microscopic morphologies of pristine fullerenes and supramolecular complexes, it was found that the construction of supramolecules helps to improve the morphology of metallofullerenes on FTO glass. Additionally, their electrical conductivity in optoelectronic devices was tested, respectively, indicating that the construction of supramolecules facilitates the transport of charge carriers. This work discloses the potential application of metallofullerene supramolecular complexes as photodetector and photoelectronic materials.
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Gale, Philip A., Jeffery T. Davis, and Roberto Quesada. "Anion transport and supramolecular medicinal chemistry." Chemical Society Reviews 46, no. 9 (2017): 2497–519. http://dx.doi.org/10.1039/c7cs00159b.

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Beginn, U., G. Zipp, A. Mourran, P. Walther, and M. Möller. "Membranes Containing Oriented Supramolecular Transport Channels." Advanced Materials 12, no. 7 (April 2000): 513–16. http://dx.doi.org/10.1002/(sici)1521-4095(200004)12:7<513::aid-adma513>3.0.co;2-s.

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Cheng, Chuyang, Paul R. McGonigal, Wei-Guang Liu, Hao Li, Nicolaas A. Vermeulen, Chenfeng Ke, Marco Frasconi, Charlotte L. Stern, William A. Goddard III, and J. Fraser Stoddart. "Energetically Demanding Transport in a Supramolecular Assembly." Journal of the American Chemical Society 136, no. 42 (October 10, 2014): 14702–5. http://dx.doi.org/10.1021/ja508615f.

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Gierschner, Johannes. "Directional exciton transport in supramolecular nanostructured assemblies." Physical Chemistry Chemical Physics 14, no. 38 (2012): 13146. http://dx.doi.org/10.1039/c2cp42057k.

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Pan, Arvind, Aswini Ghosh, Shubhamoy Chowdhury, and Dipankar Datta. "Electrical transport properties of a supramolecular assembly." Inorganic Chemistry Communications 4, no. 9 (September 2001): 507–10. http://dx.doi.org/10.1016/s1387-7003(01)00264-7.

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Kumar, B. V. V. S. Pavan, K. P. Sonu, K. Venkata Rao, S. Sampath, Subi J. George, and M. Eswaramoorthy. "Supramolecular Switching of Ion-Transport in Nanochannels." ACS Applied Materials & Interfaces 10, no. 28 (July 5, 2018): 23458–65. http://dx.doi.org/10.1021/acsami.8b07098.

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Kumar, B. V. V. S. Pavan, K. Venkata Rao, S. Sampath, Subi J. George, and Muthusamy Eswaramoorthy. "Supramolecular Gating of Ion Transport in Nanochannels." Angewandte Chemie 126, no. 48 (September 26, 2014): 13289–93. http://dx.doi.org/10.1002/ange.201406448.

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Kumar, B. V. V. S. Pavan, K. Venkata Rao, S. Sampath, Subi J. George, and Muthusamy Eswaramoorthy. "Supramolecular Gating of Ion Transport in Nanochannels." Angewandte Chemie International Edition 53, no. 48 (September 26, 2014): 13073–77. http://dx.doi.org/10.1002/anie.201406448.

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Davis, Jeffery T., Philip A. Gale, and Roberto Quesada. "Advances in anion transport and supramolecular medicinal chemistry." Chemical Society Reviews 49, no. 16 (2020): 6056–86. http://dx.doi.org/10.1039/c9cs00662a.

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The development of discrete molecular carriers for anions and supramolecular anion channels are reviewed followed by an overview of the use of these systems in biological systems as putative treatments for diseases such as cystic fibrosis and cancer.
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Dissertations / Theses on the topic "Supramolecular transport"

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Kim, Jinsang 1969. "Supramolecular assemblies of conjugated sensory polymers and the optimization of transport properties." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/28246.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2001.
Includes bibliographical references.
(cont.) The vectorial energy transfer design of sensory films to harvest and direct energy to the surface detection layer toward ultimate signal amplification has been discussed. Third, the role of chemical structure of a sensory polymer in the selectivity of a conjugated polymer-based fluorescent sensor has been examined. In two different sensory systems for the detection of potassium ions and a nitroaromatic explosive TNT, respectively, key chemical design parameters governing their selectivity have been rationalized. Finally, the combination of the conclusions of this thesis provided an idealized structure of a fluorescent conjugated polymer-based sensory film with optimized sensitivity and selectivity.
A sensor is one of the many important applications of conjugated polymers. Poly(p-phenylene ethynylene)s (PPEs) have been studied for fluorescence-based sensor applications. The chemical structure and nano-structure of a polymer in the solid-state are two critical parameters that determine sensitivity and selectivity of a conjugated polymer-based sensor. In this thesis, both parameters have been systematically investigated. First, the Langmuir-Blodgett method was used to control the nano-structure of PPEs in the solid-state. Rational design of surfactant PPEs made it possible to control the conformation of a single polymer strand and interpolymer spatial arrangement at the air-water interface. In situ UV-Vis and fluorescence spectroscopy on the Langmuir film in controlled nano-structures revealed the effects of conformation and spatial arrangement of conjugated polymers on their intrinsic optical properties. Since the controlled structure of a monolayer at the air-water interface can be transferred to a solid substrate, structurally well-defined multilayer LB films of PPEs with confined optical properties were fabricated. This made it possible to study the role of interpolymer aggregation in the photophysical properties of conjugated polymer films. The results provided a general design principle to make a highly emissive conjugated polymer film. Second, an ideal thickness of a sensory film for optimizing sensitivity was determined by experimental and theoretical analysis of energy transport phenomena in multilayer PPE films.
y Jinsang Kim.
Ph.D.
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Wittmann, Bernd [Verfasser], and Richard [Akademischer Betreuer] Hildner. "Tailoring long-range energy transport in supramolecular architectures / Bernd Wittmann ; Betreuer: Richard Hildner." Bayreuth : Universität Bayreuth, 2021. http://d-nb.info/1241183716/34.

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Schönle, Joachim. "Quantum transport studies for spintronics implementation : from supramolecular carbon nanotube systems to topological crystalline insulator." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAY022/document.

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L'électronique moléculaire est l'un des domaines les plus intrigants de la recherche moderne. Ce domaine pourrait produire un système de construction modulaire et évolutif pour des applications spintroniques à l'échelle nanométrique. Un exemple particulièrement prometteur est celui des aimants à une seule molécule, qui se sont déjà avérés être appropriés pour des la réalisation de spin valve et de qubit de spin. L'un des plus grands défis du domaine est l'intégration de ces objets de taille nanométrique dans des circuits complexes afin de permettre la détection et la manipulation d'états de spin moléculaires. Comme l'ont montré ces dernières années le groupe NanoSpin, les nanotubes de carbone (CNTs) peuvent servir de support pour les aimants à une seule molécule, en combinant les caractéristiques des deux constituants.Une pierre angulaire de ce projet de thèse a donc été le développement d'une technique de fabrication fiable pour des dispositifs de CNTs de haute qualité, contrôlables par de multiples électrodes de grille locales afin de permettre le contrôle local des systèmes hybrides moléculaires. Un procédé basé sur la fabrication conventionnelle à un substrat a été développé à partir de zéro, pour lequel l'optimisation de la conception des échantillons, les techniques de lithographie et de dépôt ainsi que les choix de matériaux ont dû être soigneusement incorporés afin de respecter les restrictions imposées par les conditions de croissance. Nous avons d'abord réussi à produire des échantillons CNT propres, permettant de mettre en évidence une configuration à double boite quantique, tout en ajustant des caractéristiques de type p à n. Les segments créés de cette manière peuvent être contrôlés de manière stable sur toute la longueur du dispositif et devraient donc constituer une base appropriée pour l'étude de la physique moléculaire.La matière topologique non triviale constitue une plate-forme séduisante pour étudier à la fois les principes fondamentaux et les applications possibles de la spintronique au calcul quantique. Les isolants cristallins topologiques, avec tellurure d'étain (SnTe) comme exemple principal, représentent un nouvel état au sein de ce zoo des matériaux topologiques 3D. Peu de temps après les premières réalisations expérimentales, des suggestions ont été faites sur la possibilité d’un type de supraconductivité non conventionnelle hébergé à l'interface entre la matière topologique et les supraconducteurs classiques. Les implications possibles de ces systèmes comprennent l'appariement de Cooper avec une quantité de mouvement finie dans la phase FFLO ou l’ordinateur quantique topologique, basé sur des excitations particulières, appelé quasi-particule Majorana.Ce projet de thèse visait à participer à l'enquête sur les signes de supraconductivité non conventionnelle dans SnTe. Les expériences de transport sur des couches pures dans les géométries de la barre de Hall et des dispositifs hybrides supraconducteurs, réalisés à la fois comme jonctions Josephson et SQUID, sont discutés. Un couplage étonnamment fort de SnTe au supraconducteur a été trouvé et dépendances de la supraconductivité sur les géométries des échantillons, la température et le champ magnétique ont été étudiées. La relation courant-phase a été analysée dans la limite d’effets cinétiques forts. Le couplage électrostatique et l'exposition à des micro-ondes ont été explorée, mais la physique prédominante dans de telles configurations s'est avéré être de type purement conventionnel, soulignant l’importance des améliorations sur le côté matériaux.Des mesures de champ magnétique dans le plan ont donné lieu à la signature d’un φ0-SQUID avec des transitions 0-π accordables, fournissant des preuves de possibles de transitions contrôlées de la supraconductivité triviale aux régimes de couplage non conventionnels dans SnTe
Molecular electronics is one of the most intriguing fields of modern research, which could bring forth a modular and scalable building system for nanoscale spintronics applications. A particularly promising example are single-molecule magnets, which have already successfully shown to be suitable for spin valve or spin qubit operations. One of the biggest challenges of the field is the integration of these nanometer-sized objects in complex circuits in order to allow for detection and manipulation of moleculear spin states. As shown in recent years by the NanoSpin group, carbon nanotubes (CNTs) can serve as such type of carrier for the single-molecule magnets, combining features of both constituents.A corner stone of this thesis project was hence the development of a dependable fabrication technique for high-quality CNT devices, controllable by multiple local gate electrodes in order to enable local control of molecular hybrid systems. A process based on conventional one-chip fabrication was developed from scratch, for which optimization of sample design, lithography and deposition techniques as well as material choices had to be carefully incorporated, in order to accomodate the restrictions imposed by the CNT growth conditions on the prevention of leakage currents. We succeeded in producing clean CNT devices, which could support a double dot configuration, tunable from p- to n-type characteristics. The segments created in this way can be stabily controlled over the entire device length and should hence provide a suitable backbone to study molecular physics.Topological matter constitutes an enticing platform to investigate both fundamental principles as well as possible applications from spintronics to quantum computation. Topological crystalline insulators, with tin telluride ( SnTe ) as a prime example, represent a new state of matter within this zoo of 3D topological materials. Soon after first experimental realizations, suggestions were made about the possibility of an unconventional type of superconductivity hosted at the interface between topological matter and conventional superconductors. Possible implications of such systems include Cooper pairing with finite momentum, the FFLO phase, or topological quantum computing, based on peculiar excitations, called Majorana bound states.This thesis project aimed to participate in the investigation of signs of unconventional superconductivity in SnTe . Transport experiments on bare films in Hall bar geometries and superconducting hybrid devices, realized as both Josephson junctions and SQUIDs, are discussed. A surprisingly strong coupling of SnTe to Ta superconductor was found and dependencies of superconductivity on sample geometries, temperature and magnetic field were investigated. The current-phase relation was analyzed in the limit of strong kinetic effects. Electrostatic gating and rf exposure was explored, but predominant physics in such configurations turned out to be of purely conventional type, pointing out the importance of improvements on the material side.In-plane magnetic field measurements gave rise to the manifestation of ϕ0-SQUIDs with tunable 0−π-transitions, providing evidence for possible controlled transitions from trivial superconductivity to unconventional coupling regimes in SnTe
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Gence, Valérie. "Auto-assemblage dynamique de nano-objets pour de nouvelles voies de transport membranaire dirigé." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20263/document.

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Le sujet principal de ces travaux de thèse concerne la synthèse et la caractérisation de nouveaux matériaux membranaires bioinspirés dont la fonction première est le transport dirigé d'espèces chimiques. La réalisation de ces systèmes est basée sur l'auto-assemblage de briques élémentaires (moléculaires, polymériques) dont les propriétés vont induire la création de chemins de transport directionnels au sein des nouveaux matériaux. Tout d'abord, la synthèse de nouveaux composés bola-amphiphiles a tout d'abord été présentés. Ces derniers ont ensuite été étudiées par spectroscopie de fluorescence et par diffusion dynamique de la lumière ont permis de mettre en évidence leur capacité à former des canaux ioniques, des canaux protoniques et des canaux d'eau au sein d'une bicouche lipidique. Une seconde étude a consisté en l'élaboration de nanomatériaux membranaires mésoporeux. Ces derniers ont été fonctionnalisés par des groupements hydrophobes afin de permettre le confinement de composés au sein des mésopores via des interactions de van der Waals. Enfin ,une dernière étude a porté sur la l'élaboration de matériaux membranaires à base d'Aquaporines artificielles dans le but d'obtenir un matériau permettant un transport dirigé d'eau au travers de la membrane
The main topic of this thesis concerns the synthesis and characterization of novel bioinspired membrane materials whose primary function is the transport of chemical species directed . The realization of these systems is based on the self-assembly of building blocks ( molecular , polymeric ) whose properties will induce directional transport in new materials.First, the synthesis of new bola - amphiphilic compounds was shown . They were then examined by fluorescence spectroscopy and dynamic light scattering allowed to highlight their ability to form ion channels, proton channels and water channels in a lipid bilayer.A second study involved the development of mesoporous nanomaterials membrane. These have been functionalized with hydrophobic groups to allow the confinement of the compounds in the mesopores via van der Waals interactions.Finally, a recent study has focused on the development of materials membrane based on artificial Aquaporins in order to obtain a material to transport water directed through the membrane
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Chen, Ying. "NMR Applications in Soft Materials Science: Correlation of Structure, Dynamics, and Transport." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/75177.

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This dissertation aims to investigate and correlate structure, dynamics and transport properties of several novel soft materials systems using multiple Nuclear Magnetic Resonance (NMR) methodologies, including solid-state NMR (SSNMR), diffusometry, and imaging, and with the help of X-ray scattering. First, we report the investigation of structure and dynamics of three polymeric membranes: hydroxyalkyl-containing imidazolium homopolymers, poly(arylene ether sulfone) segmented copolymers, and disulfonated poly(arylene ether sulfone) random copolymers using a wide array of SSNMR techniques, including: 1) ¹³C cross-polarization magic angle spinning (CPMAS) with varying cross-polarization (CP) contact time, 2) ¹³C single-pulse magic angle spinning (MAS) with varying delay time, 3) ²³Na single-pulse MAS, 4) two dimensional phaseadjusted spinning sideband (2D PASS), 5) proton spin−lattice relaxation (T₁), 6) rotating frame spin−lattice relaxation (T₁ρ), and 7) center-band-only detection of exchange (CODEX). These various types of SSNMR spectroscopic methods provide a wealth of structural and dynamic information over a wide range of time scales from a few nanoseconds to seconds. We further present a picture of rich structural and transport behaviors in supramolecular assemblies formed by amphiphilic wedge molecules using a combination of ²³Na solid-state NMR, ¹H/²H PFG NMR diffusion, relaxation and grazing-incidence small-angle X-ray scattering. Our results show that the liquid crystalline domains in these materials undergo a transition from columnar to bicontinuous cubic phases with a simple increase in humidity, while the amorphous domain boundaries consist of individual wedge molecules with a significant fraction (~ 10%) of total wedge molecules. Multiple-component diffusion of both wedges and water further confirms the structural and dynamic heterogeneity, with the bicontinous cubic phase being able to facilitate much faster water and ion transport than the columnar phase. We then develop a quantitative approach to probe the migration of two novel “theranostic” polymeric agents (combining “therapeutic” and “diagnostic” functions) into bulk hydrogels using two distinct time-resolved magnetic resonance imaging (MRI) methods. To the best of our knowledge, this is the first work that combines time-resolved MRI experiments to reliably quantify diffusivity of paramagnetic and superparamagnetic nanoparticles in bulk biological media. Our results agree closely with those obtained from fluorescence techniques, yet the capability of our approach allows the analysis of actual nanoparticles diffusion through biogels on mm to cm scales during a range of time periods. Finally, we employ a combination of NMR techniques to obtain a comprehensive understanding of ion clustering and transport behaviors of ionic liquids inside the benchmark ionic polymer Nafion. Spin relaxation shows that anion relaxation is more influenced by the fixed sulfonate groups than cation relaxation. 2D ¹H-¹⁹F heteronuclear Overhauser effect spectroscopy (HOESY) and 1D ¹⁹F¹⁹F selective nuclear Overhauser effect (NOE) spectroscopy confirm our assumption of the formation of ion clusters at low water content in the ionomer. While we observe non-restricted diffusion behavior for cations, anion diffusion is strongly restricted both between domain boundaries and within domains in the absence of water. The restricted anion diffusion can serve as a reliable probe for detailed multiscale structures of the ionomer.
Ph. D.
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López, Brito Kenia Amelia. "Síntesis de compuestos híbridos nanoestructurados y evaluación de su comportamiento supramolecular y actividad biológica." Doctoral thesis, Universitat de les Illes Balears, 2013. http://hdl.handle.net/10803/127218.

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En el trabajo desarrollado en esta tesis se han sintetizado y caracterizado diversas nanopartículas de óxidos de hierro funcionalizadas con escuaramidas o antifolatos a través del uso de linkers apropiados como la dopamina o el APTES. Varias nanopartículas funcionalizadas con escuaramidas han sido utilizadas para evaluar su comportamiento supramolecular frente a carboxilatos e iones de metales pesados. Se ha demostrado la capacidad de la conjunción nanopartícula-escuaramida para actuar como receptores de estos analitos estableciendo cierta selectividad en el proceso. Algunas de estas nanopartículas también han sido estudiadas como posibles agentes transportadores de fármacos antineoplásicos, específicamente, antifolatos. Se han evaluado dos estrategias de transporte: una a través de interacciones no covalentes y otra mediante enlaces covalentes. A través de ensayos de viabilidad celular frente a células de adenocarcinoma de pulmón humano (A549) se determinó la mayor eficacia de la estrategia covalente frente a la no covalente.
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Marmin, Thomas. "Premiers nanovecteurs supramoléculaires ciblant le cerveau par transport actif." Mémoire, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/10492.

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La délivrance de médicament dans l’organisme vers des organes cibles tout en minimisant les effets secondaires représente un énorme défi scientifique. Les recherches actuelles révèlent qu’il existe de nombreuses embuches pour acheminer des composés thérapeutiques vers le système nerveux central. De nombreuses maladies (l’autisme, la schizophrénie, la maladie d’Alzheimer…) liées au système nerveux central nuisent à la qualité de vie et entrainent des coûts importants pour la société. Ce mémoire repose sur l’amélioration de l’accessibilité de composés thérapeutiques vers le cerveau en passant la barrière hémato-encéphalique, une barrière biologique difficilement franchissable. Pour introduire des médicaments dans le système nerveux central, il faut passer cette barrière, ce qui est très difficile, car elle est remarquablement efficace pour protéger le milieu cérébral. C’est pourquoi nous allons développer une nouvelle stratégie consistant à élaborer un nouveau type de transporteur. Nous proposons d’utiliser des macrolactames ayant la propriété de s’empiler sous forme de tubes supramoléculaires d’une stabilité adéquate. Il sera alors possible d’y greffer des médicaments et aussi des agents d’ouverture de la barrière hémato-encéphalique. Ce mémoire présente l’élaboration de ces nouveaux macrocycles chiraux, les résultats de différentes analyses structurales prouvant la présence de tubes et de systèmes robustes et enfin la fonctionnalisation du macrocycle par un agent médicamenteux (doxorubicine).
Abstract : Delivering drug into the body to target specific organs, while minimizing side effects, is an enormous scientific challenge. Current research reveals that there are many pitfalls for delivering therapeutic compounds to the central nervous system. Many diseases (autism, schizophrenia, Alzheimer's, etc.) linked to the central nervous system affect the quality of life and entail significant costs for society. This thesis is based on the improvement in the accessibility of therapeutic compounds to the brain by passing the blood-brain barrier, a biological barrier difficult to cross. To introduce drugs into the central nervous system, this barrier must be overcome. This is very difficult because it is remarkably effective in protecting the brain. This is why we will develop a new strategy based on a new type of transporter. We propose to use macrolactams having the property of stacking in the form of supramolecular tubes of adequate stability. It will then be possible to graft medicines and also agents capable of opening the blood-brain barrier. This manuscript describes the development of these new chiral macrocycles, the results of various structural analyses proving the presence of robust tubes and systems, and finally the functionalization of the macrocycles by a medicinal agent (doxorubicin).
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Walker, Glen William, and not available. "Electron Transfer Reactivity, Synthesis, Surface Chemistry and Liquid-Membrane Transport of Sarcophagine-Type Poly-Aza Cage Complexes." The Australian National University, 1997. http://thesis.anu.edu.au./public/adt-ANU20010702.124104.

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[Formulae and special characters can only be approximated here. Please see the pdf version of the Abstract for an accurate reproduction.] The kinetics for outer-sphere electron transfer between a series of cobalt(II) poly-aza cage ligand complexes and the iron(III) sarcophagine-type hexa-aza cage complex, [Fe(sar)]3+ (sar = 3,6,10,13,16,19-hexaazabicyclo[6.6.6]icosane), in aqueous solution have been investigated and the Marcus correlation is used to deduce the electron self-exchange rate constant for the [Fe(sar)]3+/2+ couple from these cross-reactions. The deduced electron self-exchange rate constant is in relatively good agreement with the experimentally determined rate constant (k ex calc = 4 ´ 10 5 M -1 s -1 ; k ex obs = 8 ´ 10 5 M -1 s -1 ). The successful application of the Marcus correlation to the electron transfer reactions of the Fe cage complex is consistent with the trend for the Co, Mn, Ni and Ru cage complexes which all follow the pattern of outer-sphere electron transfer reactivity expected from the Marcus-Hush formalism. A comparison of predictions based on the Marcus correlation with the experimentally determined kinetics of an extended series of cross reactions involving cobalt cage complexes with low-spin-high-spin cobalt(III)/(II) couples shows that electron transfer reactions involving large spin changes at the metal centre are not necessarily anomalous in the context of the adiabatic Marcus-Hush formalism. The results of this study also show that for suitable systems, the Marcus correlation can be used to reliably calculate the rates of outer-sphere electron transfer cross-reactions, with reaction free-energy changes spanning the range -6 to -41 kJ mol -1 and many different combinations of initial electronic configurations. Together, these results provide a coherent and internally consistent set of experimental data in support of the Marcus-Hush formalism for outer-sphere electron transfer. The results with the caged metal-ion systems also highlight the special nature of the mechanism of electron transfer in reactions of metal-aqua ions. ¶ A new range of symmetrically disubstituted hexa-aza sarcophagine-type cage ligand complexes are prepared in this study by the base-catalysed co-condensation of formaldehyde and a-methylene aliphatic aldehydes with cobalt(III) tris(1,2-diamine) precursors in acetonitrile solution. Encapsulation reactions based on the condensation of the weak carbon di-acids propanal and decanal with formaldehyde and the cobalt(III) tris(1,2-diamine) precursors, [Co(en)3 ] 3+ (en = 1,2-ethanediamine) and D-lel3 -[Co((R, R)-chxn)3 ] 3+ (chxn = 1,2-cyclohexanediamine), yield unsaturated cobalt(III) cage complexes with an endo-cyclic imine function in each cap. The Co III -coordinated endo-cyclic imine units of the cage ligands are reactive electrophiles that are readily reduced by the BH4 - ion to give the corresponding symmetrically di-substituted hexaamine macrobicyclic cage ligands. The nitromethane carbanion is also shown to add at the endo-cyclic imine function to yield a novel nitromethylated cage ligand complex. The latter reaction introduces a new method for the regioselective functionalisation of cage ligands at sites removed from the more commonly substituted bridgehead positions. The capping of cobalt(III) tris(1,2-diamine)-type complexes with weak CH-acids developed in this study introduces a new and more direct route to symmetrically di-substituted cage ligand complexes. ¶ A new range of cobalt(III) surfactant cage complexes, with linear octyl, dodecyl and hexadecyl hydrocarbon chains built directly into the bridgehead structure of the cage ligand, have been prepared by the base catalysed co-condensation of formaldehyde and long chain aliphatic aldehydes with the tripodal cobalt(III) hexaamine complex, [Co(sen)]3+ (sen = 4,4',4''-ethylidynetris(3-azabutan-1-amine)), in acetonitrile solution. Chiral surfactant cage complexes are obtained by capping reactions beginning with the optically pure L-[Co(sen)]3+ precursor complex. The cobalt(III) cage complexes with octyl to hexadecyl substituents are surface active and reduce the surface tension of water to levels approaching those of organic solvents. The dodecyl substituted cage complex forms micelles in aqueous solution when the concentration of cage complex is > 1 ´ 10 -3 mol dm -3 at 25 °C. The cobalt(III) cage head-group of these surfactants undergoes an electrochemically reversible one-electron reduction to the corresponding cobalt(II) cage complex. The reduction potential of the surfactant head group can be tuned to more positive potentials by replacing the bridgehead hydrocarbon chain substituent with an ether linked hydrocarbon chain. The cobalt(III) surfactant-cage complexes are biologically active and are lethal to the tapeworm Hymenolepis diminuta, and the vaginal parasites, Trichomonas vaginalis and Tritrichomonas foetus. The surfactant cage complexes also cause lysis in red-blood cell membranes at concentrations as low 10 -5 mol dm -3 . Their biological activity is linked to the high head-group charge (3+) and size which cause distortions in biological membranes when the membrane is treated with these molecules. The combination of the chemically reversible outer-sphere redox properties of the cobalt cage head-groups and the chirality of the head group introduces a new and possibly unique series of chiral surfactant coordination complexes which are also redox active. ¶ The chiral carboxylic-acid ionophore, lasalocid A, has been used to promote the selective supramolecular transport and extraction of cobalt(III) hexa-aza cage cations and related tripodal cobalt(III) complexes. The conjugate base anion of lasalocid A forms stoichiometric outer-sphere complexes with the cobalt(III) cage and tripod complexes. These outer-sphere complexes are highly lipophilic and partition strongly from water into a chloroform phase. The extraction of the dissymmetric cobalt(III) complexes by the chiral polyether anion is enantioselective for many systems and results in the partial resolution of initially racemic complexes in the aqueous phase. A strong structural preference was demonstrated by the ionophore for symmetrically disubstituted cobalt(III) hexa-aza cage cations with a D-absolute configuration of the ligand about the metal-ion and an R configuration of the coordinated secondary amine N-H groups. The lasalocid A anion was also shown to promote the transport of the complexes, intact, across a chloroform bulk-liquid membrane against an NH4 + concentration gradient. The transport of the cobalt(III) complexes was also enantioselective and resulted in partial resolution of the initially racemic aqueous phase. The most efficiently transported enantiomer of each complex was also the most efficiently extracted isomer in all systems examined, consistent with a transport process limited by interfacial diffusion. The magnitude of the enantiomer separation obtained in some systems was sufficient to indicate that lasalocid A mediated extraction and transport may become a practical method for the resolution of particular types of kinetically-inert chiral metal-amine complexes.
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Wang, Chien-Lung. "Synthesis and Characterization of C60-Porphyrin Derivatives for Enhanced Photovoltaic Performance through Efficient Charge Generation and Transport." University of Akron / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=akron1301353045.

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Chang, Mincheol. "Processing parameter effects on the molecular ordering and charge transport of poly(3-hexylthiophene) thin films." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54281.

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Conjugated polymers have attracted much interest as promising alternatives to inorganic semiconductors, due to their low-temperature, solution-based processability, which may provide for low-cost, large-area electronic device fabrication. However, commercialization of polymer-based electronic devices has been restricted owing to low device performance of solidified thin-films. In order to enhance charge transport of polymer semiconductor thin-films, the self-organization of organic polymer semiconductors into ordered supramolecular assemblies has been achieved by tuning a range of process parameters including film deposition method (spin vs. drop cast), solvent boiling point (low vs. high boiling point), polymer-dielectric interface treatment, and post-deposition processing (solvent vapor or thermal annealing). However, these strategies give rise to limitations for large-scale high-throughput processing due to associated pre- and/or post semiconductor deposition steps. Therefore, in this thesis, we identify alternative processing parameters (i.e., hydrogen bonds between good and poor solvents, UV irradiation to polymer precursor solutions, and combination of sonication and subsequent UV irradiation to polymer precursor solutions) which can contribute to enhancement in charge transport of a model polymer semiconductor, poly(3-hexylthiophene) (P3HT), eliminating the additional pre- and/or post-steps mentioned above. Further, we understand of how the processing parameters effect intra- and intermolecular interactions of the polymer chains, micro- through macroscopic morphologies, and charge transport characteristics of the resultant films.
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Books on the topic "Supramolecular transport"

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Suslick, K. S. Comprehensive Supramolecular Chemistry : Supramolecular Reactivity and Transport: Bioinorganic Systems (Comprehensive Supramolecular Chemistry). Pergamon, 1996.

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Murakami, Y. Comprehensive Supramolecular Chemistry : Supramolecular Reactivity and Transport: Bioorganic Systems (Comprehensive Supramolecular Chemistry). Pergamon, 1996.

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Suslick, K. S. Comprehensive Supramolecular Chemistry, Volume 5 : Supramolecular Reactivity and Transport: Bioinorganic Systems. Elsevier Science & Technology Books, 1999.

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Book chapters on the topic "Supramolecular transport"

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Fyles, T. M. "Cation Transport Across Bilayer Membranes." In Physical Supramolecular Chemistry, 39–46. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0317-3_4.

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Martinelli, Nicolas, Yoann Olivier, Luca Muccioli, Andrea Minoia, Patrick Brocorens, Mari-Carmen Ruiz Delgado, Claudio Zannoni, et al. "Charge Transport in Organic Semiconductors: A Multiscale Modeling." In Functional Supramolecular Architectures, 1–38. Weinheim, Germany: WILEY-VCH Verlag & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527689897.ch01.

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Bässler, Heinz, and Anna Köhler. "Charge Transport in Organic Semiconductors." In Unimolecular and Supramolecular Electronics I, 1–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/128_2011_218.

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Yamana, Kazushige. "Gating Electrical Transport Through DNA." In DNA in Supramolecular Chemistry and Nanotechnology, 79–93. Chichester, UK: John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781118696880.ch2.1.

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Yamana, Kazushige, A. Erbe, Jacqueline K. Barton, Ariel L. Furst, Michael A. Grodick, Jungkweon Choi, and Tetsuro Majima. "DNA Wires and Electron Transport Through DNA." In DNA in Supramolecular Chemistry and Nanotechnology, 79–136. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118696880.ch2.

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Barton, Jacqueline K., Ariel L. Furst, and Michael A. Grodick. "DNA Sensors Using DNA Charge Transport Chemistry." In DNA in Supramolecular Chemistry and Nanotechnology, 105–20. Chichester, UK: John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781118696880.ch2.3.

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Canadell, E. "Hydrogen Bonding and Transport Properties of Molecular Conductors." In Supramolecular Engineering of Synthetic Metallic Materials, 337–51. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-5280-8_20.

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Govor, L. V., and J. Parisi. "Charge Transport in Chain of Nanoparticles." In Bottom-Up Self-Organization in Supramolecular Soft Matter, 83–99. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-19410-3_4.

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Zonda, Radu, Sorin-Alexandru Ibanescu, Mihaela Silion, Adina Coroaba, Dragos-Lucian Isac, Marc J. M. Abadie, and Mariana Pinteala. "Measuring Ionic Transport Through Lipid Bilayers." In New Trends in Macromolecular and Supramolecular Chemistry for Biological Applications, 25–50. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-57456-7_2.

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Danz, Karin, Hagen von Briesen, and Sylvia Wagner. "Biodegradable Nanoparticles for Specific Drug Transport." In New Trends in Macromolecular and Supramolecular Chemistry for Biological Applications, 255–74. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-57456-7_13.

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Conference papers on the topic "Supramolecular transport"

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Curnutt, Austin, Kaylee Smith, Emily Darrow, Keisha B. Walters, Erick S. Vasquez, and Santanu Kundu. "Physicochemical Characterization of Mammalian Mucus and Mucin Solutions in Response to pH and [Ca2+]." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-4944.

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Abstract Mucus is a complex fluid that maintains moisture and simultaneously acts as a barrier and facilitates transport of select materials between the body and adjacent fluids. While mucus is comprised primarily of water, it is highly heterogeneous containing the biopolymer mucin along with lipids, salts, DNA, proteins, and cells. Complex mechanisms control the reversible network formation observed in mucus and mucin solutions. Some isolated relationships between biopolymer network structure, pH and ionic strength, and rheology have been identified; however, a complete understanding of the interplay in these mechanisms is lacking. In this effort, rheology of native mucus and mucin solutions was examined as a function of pH and salt concentration. Bulk rheology of native and artificial lung mucus confirmed that native mucus displays a solid-like behavior at low strain values. Mucus displays this solid-like gel behavior at pH values ca. 4 and below, and displays solution behavior at higher pH values. Ion concentration also plays an important role with divalent cations (Ca2+) reducing the viscosity of gelled mucin and increasing the viscosity of solution-state mucin. In addition to rheological characterization, mucin-mucin and mucin-solute interactions and resultant changes in microstructure were also studied. Morphological and chemical changes at the nano-scale were correlated to the micro-structural changes observed with rheology. Dynamic light scattering showed mucin polymer particle size heterogeneity as well as a significant increase in particle size at pH values ca. 4 and below — where the solutions display a gel behavior. Using zeta potential a decrease in dispersive forces was observed that allows for polymer-polymer interaction and particle aggregation at low pH values. Atomic force micrography showed spheroid-like aggregates between adjacent mucin particles under acidic conditions. The ability to understand and control the reversible association of network structures in polymer and biopolymer systems, such as mucin, through supramolecular interactions has fundamental impacts in the field of polymer science and engineering. There is also significant potential to advance applications involving novel hydrogel materials, such as disease treatments and drug delivery.
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Reports on the topic "Supramolecular transport"

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Wilson, William L., and Charles M. Schroeder. DOE BES: Directed Assembly of Bio-inspired Supramolecular Materials for Energy Transport and Capture: Mesoscale Construction of Functional Materials in Hydrodynamic Flows. Final Project Report. Office of Scientific and Technical Information (OSTI), September 2018. http://dx.doi.org/10.2172/1470938.

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Kirchhoff, Helmut, and Ziv Reich. Protection of the photosynthetic apparatus during desiccation in resurrection plants. United States Department of Agriculture, February 2014. http://dx.doi.org/10.32747/2014.7699861.bard.

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In this project, we studied the photosynthetic apparatus during dehydration and rehydration of the homoiochlorophyllous resurrection plant Craterostigmapumilum (retains most of the photosynthetic components during desiccation). Resurrection plants have the remarkable capability to withstand desiccation, being able to revive after prolonged severe water deficit in a few days upon rehydration. Homoiochlorophyllous resurrection plants are very efficient in protecting the photosynthetic machinery against damage by reactive oxygen production under drought. The main purpose of this BARD project was to unravel these largely unknown protection strategies for C. pumilum. In detail, the specific objectives were: (1) To determine the distribution and local organization of photosynthetic protein complexes and formation of inverted hexagonal phases within the thylakoid membranes at different dehydration/rehydration states. (2) To determine the 3D structure and characterize the geometry, topology, and mechanics of the thylakoid network at the different states. (3) Generation of molecular models for thylakoids at the different states and study the implications for diffusion within the thylakoid lumen. (4) Characterization of inter-system electron transport, quantum efficiencies, photosystem antenna sizes and distribution, NPQ, and photoinhibition at different hydration states. (5) Measuring the partition of photosynthetic reducing equivalents between the Calvin cycle, photorespiration, and the water-water cycle. At the beginning of the project, we decided to use C. pumilum instead of C. wilmsii because the former species was available from our collaborator Dr. Farrant. In addition to the original two dehydration states (40 relative water content=RWC and 5% RWC), we characterized a third state (15-20%) because some interesting changes occurs at this RWC. Furthermore, it was not possible to detect D1 protein levels by Western blot analysis because antibodies against other higher plants failed to detect D1 in C. pumilum. We developed growth conditions that allow reproducible generation of different dehydration and rehydration states for C. pumilum. Furthermore, advanced spectroscopy and microscopy for C. pumilum were established to obtain a detailed picture of structural and functional changes of the photosynthetic apparatus in different hydrated states. Main findings of our study are: 1. Anthocyan accumulation during desiccation alleviates the light pressure within the leaves (Fig. 1). 2. During desiccation, stomatal closure leads to drastic reductions in CO2 fixation and photorespiration. We could not identify alternative electron sinks as a solution to reduce ROS production. 3. On the supramolecular level, semicrystalline protein arrays were identified in thylakoid membranes in the desiccated state (see Fig. 3). On the electron transport level, a specific series of shut downs occur (summarized in Fig. 2). The main events include: Early shutdown of the ATPase activity, cessation of electron transport between cyt. bf complex and PSI (can reduce ROS formation at PSI); at higher dehydration levels uncoupling of LHCII from PSII and cessation of electron flow from PSII accompanied by crystal formation. The later could severe as a swift PSII reservoir during rehydration. The specific order of events in the course of dehydration and rehydration discovered in this project is indicative for regulated structural transitions specifically realized in resurrection plants. This detailed knowledge can serve as an interesting starting point for rationale genetic engineering of drought-tolerant crops.
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