The Experts below are selected from a list of 183351 Experts worldwide ranked by ideXlab platform
Calum J Drummond - One of the best experts on this subject based on the ideXlab platform.
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solvent nanostructure the solvophobic effect and amphiphile Self Assembly in ionic liquids
Chemical Society Reviews, 2013Co-Authors: Tamar L Greaves, Calum J DrummondAbstract:The ability of ionic liquids (ILs) to support amphiphile Self-Assembly into a range of mesophase structures has been established as a widespread phenomenon. From the ILs evaluated as Self-Assembly media, the vast majority have supported some lyotropic liquid crystal phase formation. Many neat ionic liquids have been shown to segregate into polar and non-polar domains to form a nanostructured liquid. A very strong correlation between the nanostructure of the ionic liquid and its characteristics as an amphiphile Self-Assembly solvent has been found. In this review we discuss ionic liquids as amphiphile Self-Assembly media, and identify trends that can be used to distinguish which ionic liquids are likely to have good promotion properties as Self-Assembly media. In particular these trends focus on the nanostructure of neat ionic liquids, their solvent cohesive energy density, and the related solvophobic effect. We forecast that many more ILs will be identified as amphiphile Self-Assembly solvents in the future.
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Ionic liquids as amphiphile Self-Assembly media
Chemical Society Reviews, 2008Co-Authors: Tamar L Greaves, Calum J DrummondAbstract:In recent years, the number of non-aqueous solvents which mediate hydrocarbon–solvent interactions and promote the Self-Assembly of amphiphiles has been markedly increased by the reporting of over 30 ionic liquids which possess this previously unusual solvent characteristic. This new situation allows a different exploration of the molecular ''solvophobic effect'' and tests the current understanding of amphiphile Self-Assembly. Interestingly, both protic and aprotic ionic liquids support amphiphile Self-Assembly, indicating that it is not required for the solvents to be able to form a hydrogen bonded network. Here, the use of ionic liquids as amphiphile Self-Assembly media is reviewed, including micelle and liquid crystalline mesophase formation, their use as a solvent phase in microemulsions and emulsions, and the emerging field of nanostructured inorganic materials synthesis. Surfactants, lipids and block co-polymers are the focus amphiphile classes in this critical review (174 references).
Tamar L Greaves - One of the best experts on this subject based on the ideXlab platform.
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solvent nanostructure the solvophobic effect and amphiphile Self Assembly in ionic liquids
Chemical Society Reviews, 2013Co-Authors: Tamar L Greaves, Calum J DrummondAbstract:The ability of ionic liquids (ILs) to support amphiphile Self-Assembly into a range of mesophase structures has been established as a widespread phenomenon. From the ILs evaluated as Self-Assembly media, the vast majority have supported some lyotropic liquid crystal phase formation. Many neat ionic liquids have been shown to segregate into polar and non-polar domains to form a nanostructured liquid. A very strong correlation between the nanostructure of the ionic liquid and its characteristics as an amphiphile Self-Assembly solvent has been found. In this review we discuss ionic liquids as amphiphile Self-Assembly media, and identify trends that can be used to distinguish which ionic liquids are likely to have good promotion properties as Self-Assembly media. In particular these trends focus on the nanostructure of neat ionic liquids, their solvent cohesive energy density, and the related solvophobic effect. We forecast that many more ILs will be identified as amphiphile Self-Assembly solvents in the future.
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Ionic liquids as amphiphile Self-Assembly media
Chemical Society Reviews, 2008Co-Authors: Tamar L Greaves, Calum J DrummondAbstract:In recent years, the number of non-aqueous solvents which mediate hydrocarbon–solvent interactions and promote the Self-Assembly of amphiphiles has been markedly increased by the reporting of over 30 ionic liquids which possess this previously unusual solvent characteristic. This new situation allows a different exploration of the molecular ''solvophobic effect'' and tests the current understanding of amphiphile Self-Assembly. Interestingly, both protic and aprotic ionic liquids support amphiphile Self-Assembly, indicating that it is not required for the solvents to be able to form a hydrogen bonded network. Here, the use of ionic liquids as amphiphile Self-Assembly media is reviewed, including micelle and liquid crystalline mesophase formation, their use as a solvent phase in microemulsions and emulsions, and the emerging field of nanostructured inorganic materials synthesis. Surfactants, lipids and block co-polymers are the focus amphiphile classes in this critical review (174 references).
Erik Winfree - One of the best experts on this subject based on the ideXlab platform.
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integrating dna strand displacement circuitry with dna tile Self Assembly
Nature Communications, 2013Co-Authors: David Y Zhang, Harry M T Choi, Rizal F Hariadi, Erik WinfreeAbstract:DNA nanotechnology has emerged as a reliable and programmable way of controlling matter at the nanoscale through the specificity of Watson–Crick base pairing, allowing both complex Self-assembled structures with nanometer precision and complex reaction networks implementing digital and analog behaviors. Here we show how two well-developed frameworks, DNA tile Self-Assembly and DNA strand-displacement circuits, can be systematically integrated to provide programmable kinetic control of Self-Assembly. We demonstrate the triggered and catalytic isothermal Self-Assembly of DNA nanotubes over 10 µm long from precursor DNA double-crossover tiles activated by an upstream DNA catalyst network. Integrating more sophisticated control circuits and tile systems could enable precise spatial and temporal organization of dynamic molecular structures.
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Algorithmic Self-Assembly of DNA
2006 International Conference on Microtechnologies in Medicine and Biology, 2006Co-Authors: Erik WinfreeAbstract:Summary form only given. Nucleic acids have proven to be remarkably versatile as an engineering material for chemical tasks including the storage of information, catalyzing reactions creating and breaking bonds, mechanical manipulation using molecular motors, and constructing supramolecular structures. This talk will focus particularly on molecular Self-Assembly, giving examples of engineered DNA "tiles" that crystallize into two-dimensional sheets, one-dimensional tubes and ribbons, and information-guided patterns such as a Sierpinski triangle and a binary counter. A theme is how cooperative binding can be used to control nucleation and direct selective tile attachment. Such "algorithmic" Self-Assembly may provide a bottom-up fabrication method for creating complex, well-defined supramolecular structures that can be used as scaffolds or templates for applications such as arranging molecular electronic components into active circuits
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algorithmic Self Assembly of dna sierpinski triangles
PLOS Biology, 2004Co-Authors: Paul W K Rothemund, Nick Papadakis, Erik WinfreeAbstract:Algorithms and information, fundamental to technological and biological organization, are also an essential aspect of many elementary physical phenomena, such as molecular Self-Assembly. Here we report the molecular realization, using two-dimensional Self-Assembly of DNA tiles, of a cellular automaton whose update rule computes the binary function XOR and thus fabricates a fractal pattern—a Sierpinski triangle—as it grows. To achieve this, abstract tiles were translated into DNA tiles based on double-crossover motifs. Serving as input for the computation, long single-stranded DNA molecules were used to nucleate growth of tiles into algorithmic crystals. For both of two independent molecular realizations, atomic force microscopy revealed recognizable Sierpinski triangles containing 100–200 correct tiles. Error rates during Assembly appear to range from 1% to 10%. Although imperfect, the growth of Sierpinski triangles demonstrates all the necessary mechanisms for the molecular implementation of arbitrary cellular automata. This shows that engineered DNA Self-Assembly can be treated as a Turing-universal biomolecular system, capable of implementing any desired algorithm for computation or construction tasks.
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universal computation via Self Assembly of dna some theory and experiments
DNA Based Computers, 1999Co-Authors: Erik Winfree, Xiaoping Yang, Nadrian C SeemanAbstract:In this paper we examine the computational capabilities inherent in the hybridization of DNA molecules. First we consider theoretical models, and show that the Self-Assembly of oligonucleotides into linear duplex DNA can only generate sets of sequences equivalent to regular languages. If branched DNA is used for Self-Assembly of dendrimer structures, only sets of sequences equivalent to context-free languages can be achieved. In contrast, the Self-Assembly of double crossover molecules into two dimensional sheets or three dimensional solids is theoretically capable of universal computation. The proof relies on a very direct simulation of a universal class of cellular automata. In the second part of this paper, we present results from preliminary experiments which investigate the critical computational step in a two-dimensional Self-Assembly process.
Peter J Stang - One of the best experts on this subject based on the ideXlab platform.
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Self organization in coordination driven Self Assembly
ChemInform, 2010Co-Authors: Brian H Northrop, Yao Rong Zheng, Kiwhan Chi, Peter J StangAbstract:Self-Assembly allows for the preparation of highly complex molecular and supramolecular systems from relatively simple starting materials. Typically, Self-assembled supramolecules are constructed by combining complementary pairs of two highly symmetric molecular components, thus limiting the chances of forming unwanted side products. Combining asymmetric molecular components or multiple complementary sets of molecules in one complex mixture can produce myriad different ordered and disordered supramolecular assemblies. Alternatively, spontaneous Self-organization phenomena can promote the formation of specific product(s) out of a collection of multiple possibilities. Self-organization processes are common throughout much of nature and are especially common in biological systems. Recently, researchers have studied Self-organized Self-Assembly in purely synthetic systems. This Account describes our investigations of Self-organization in the coordination-driven Self-Assembly of platinum(II)-based metallosupra...
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from solvolysis to Self Assembly
ACS National Meeting, 2009Co-Authors: Peter J StangAbstract:My sojourn from classical physical-organic chemistry and solvolysis to Self-Assembly and supramolecular chemistry, over the last forty years, is described. My contributions to unsaturated reactive intermediates, namely vinyl cations and unsaturated carbenes, along with my decade-long involvement with polyvalent iodine chemistry, especially alkynyliodonium salts, as well as my more recent research with metal-ligand, coordination driven, and directed Self-Assembly of finite supramolecular ensembles are discussed.
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coordination driven Self Assembly of functionalized supramolecular metallacycles
Chemical Communications, 2008Co-Authors: Brian H Northrop, Haibo Yang, Peter J StangAbstract:Coordination-driven Self-Assembly that combines rigid ditopic Pt(II) metal acceptors and bis-pyridyl organic donors provides a facile means of synthesizing well-defined metallacycles of predetermined size and geometry. Functionalization of the component acceptor or donor building blocks allows for the preparation of multifunctional supramolecular materials wherein the stoichiometry and position of individual functional moieties can be precisely controlled. The design, Self-Assembly, and applications of polyfunctional supramolecules incorporating functional moieties with host–guest, photonic, materials, and Self-organizational properties is discussed.
Jonathan P Hill - One of the best experts on this subject based on the ideXlab platform.
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Self Assembly as a key player for materials nanoarchitectonics
Science and Technology of Advanced Materials, 2019Co-Authors: Katsuhiko Ariga, Michihiro Nishikawa, Taizo Mori, Jun Takeya, Lok Kumar Shrestha, Jonathan P HillAbstract:ABSTRACTThe development of science and technology of advanced materials using nanoscale units can be conducted by a novel concept involving combination of nanotechnology methodology with various research disciplines, especially supramolecular chemistry. The novel concept is called ‘nanoarchitectonics’ where Self-Assembly processes are crucial in many cases involving a wide range of component materials. This review of Self-Assembly processes re-examines recent progress in materials nanoarchitectonics. It is composed of three main sections: (1) the first short section describes typical examples of Self-Assembly research to outline the matters discussed in this review; (2) the second section summarizes Self-assemblies at interfaces from general viewpoints; and (3) the final section is focused on Self-Assembly processes at interfaces. The examples presented demonstrate the strikingly wide range of possibilities and future potential of Self-Assembly processes and their important contribution to materials nanoa...
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Self-Assembly as a key player for materials nanoarchitectonics
Taylor & Francis Group, 2019Co-Authors: Katsuhiko Ariga, Michihiro Nishikawa, Taizo Mori, Jun Takeya, Lok Kumar Shrestha, Jonathan P HillAbstract:The development of science and technology of advanced materials using nanoscale units can be conducted by a novel concept involving combination of nanotechnology methodology with various research disciplines, especially supramolecular chemistry. The novel concept is called ‘nanoarchitectonics’ where Self-Assembly processes are crucial in many cases involving a wide range of component materials. This review of Self-Assembly processes re-examines recent progress in materials nanoarchitectonics. It is composed of three main sections: (1) the first short section describes typical examples of Self-Assembly research to outline the matters discussed in this review; (2) the second section summarizes Self-assemblies at interfaces from general viewpoints; and (3) the final section is focused on Self-Assembly processes at interfaces. The examples presented demonstrate the strikingly wide range of possibilities and future potential of Self-Assembly processes and their important contribution to materials nanoarchitectonics. The research examples described in this review cover variously structured objects including molecular machines, molecular receptors, molecular pliers, molecular rotors, nanoparticles, nanosheets, nanotubes, nanowires, nanoflakes, nanocubes, nanodisks, nanoring, block copolymers, hyperbranched polymers, supramolecular polymers, supramolecular gels, liquid crystals, Langmuir monolayers, Langmuir–Blodgett films, Self-assembled monolayers, thin films, layer-by-layer structures, breath figure motif structures, two-dimensional molecular patterns, fullerene crystals, metal–organic frameworks, coordination polymers, coordination capsules, porous carbon spheres, mesoporous materials, polynuclear catalysts, DNA origamis, transmembrane channels, peptide conjugates, and vesicles, as well as functional materials for sensing, surface-enhanced Raman spectroscopy, photovoltaics, charge transport, excitation energy transfer, light-harvesting, photocatalysts, field effect transistors, logic gates, organic semiconductors, thin-film-based devices, drug delivery, cell culture, supramolecular differentiation, molecular recognition, molecular tuning, and hand-operating (hand-operated) nanotechnology
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Challenges and breakthroughs in recent research on Self-Assembly
Science and Technology of Advanced Materials, 2008Co-Authors: Katsuhiko Ariga, Michael V. Lee, Richard Charvet, Ajayan Vinu, Jonathan P Hill, Somobrata AcharyaAbstract:The controlled fabrication of nanometer-scale objects is without doubt one of the central issues in current science and technology. However, existing fabrication techniques suffer from several disadvantages including size-restrictions and a general paucity of applicable materials. Because of this, the development of alternative approaches based on supramolecular Self-Assembly processes is anticipated as a breakthrough methodology. This review article aims to comprehensively summarize the salient aspects of Self-Assembly through the introduction of the recent challenges and breakthroughs in three categories: (i) types of Self-Assembly in bulk media; (ii) types of components for Self-Assembly in bulk media; and (iii) Self-Assembly at interfaces.