Time-Resolved FTIR Spectroscopy on Structure and Mobility of Single Crystal Ferroelectric Liquid Crystalline Elastomers

Skupin, H.; Kremer, Friedrich; Shilov, S. V.; Stein, Peter; Finkelmann, Heino

doi:10.1021/ma981361q

Cited by 22 publications

(17 citation statements)

References 20 publications

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“…Furthermore most of these synthetic molecules are developed for DNA vectors in gene therapy. One efficient synthetic gene-delivery agent is the Poly(amidoamine) dendrimer 2 . Size and morphology of these self-assembled nonviral gene delivery systems (DNA/dendrimer) are not fully understood, although size and morphology may influence the efficiency of transfection 3 .…”

Section: Molecular Nanotechnology Group Ipht Jena Germanymentioning

confidence: 99%

“…The structure and mobility of FCLE is studied by employing polarized, timeresolved Fourier-Transform IR-spectroscopy [1][2][3]. This enables to analyse in detail the reorientation of the single molecular moieties in the supramolecular system (angle of reorientation, time constant, phase relationship) in response to an external electric field.…”

Section: Universität Leipzig Germanymentioning

confidence: 99%

“…Models of the extinctive, scattering, and electrical transport properties of these assemblies have been developed (2). In both dry and aqueous assemblies, interparticle separations have been measured using small angle X-ray scattering (3).…”

Section: Dna-nanoparticle Assemblies: Structural Basis For the Opticamentioning

confidence: 99%

“…With respect to these efforts, DNA is a highly promising material for the fabrication of nanostructured supramolecular architecture [1]. We have carried out extensive scanning force microscopy studies on a novel class of semisynthetic DNA-protein conjugates, self-assembled oligomeric networks consisting of streptavidin and double-stranded DNA [2]. These nanostructured assemblies are applicable as high performance reagents in immuno-PCR, a very sensitive technique for the trace analysis of proteins and other antigens.…”

Section: Universität Bremen Fb 2 -Uft Germanymentioning

confidence: 99%

“…These structures consist of tungsten electrodes, etched from a 25 nm thick tungsten layer on a silicon wafer with a 80-300 nm thick thermal oxide using an electron beam lithography process based on a negative resist and a SF 6 Oppositely charged polyelectrolytes can be adsorbed onto nano-and micrometer sized particles. By using degradable cores, one can obtain hollow polyelectrolyte shells, also known as nanocapsules [1,2].…”

Section: Universität Bremen Fb 2 -Uft Germanymentioning

confidence: 99%

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Molecular‐Level Devices and Machines

Balzani¹,

Venturi²

2000

Stimulating Concepts in Chemistry

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Inorganic nanocrystals with well defined shapes are important for understanding basic size-dependent scaling laws, and may be useful in a wide range of applications. Methods for controlling the shapes of inorganic nanocrystals are evolving rapidly. This talk will focus on a strategy that involves pyrolysis of organometallic precursos in mixtures of hot organic surfactants. The surfactant mixtures can be used to control the growth rates of differnet facets of the nanocrystals, allowing for wide tunability of shape. This will be illustrated with CdSe and Co nanocrystals. Both of these materials show pronounced variation of fundamental properties with aspect ratio. The nanorods can be aligned in a variety of ways. For instance, monolayers of surfacatant coated rod-like nanocrystals of these materials display a very rich phase diagram, analogous to the phases of liquid crystals. Block copolymers can be used to orient the rods. Finally, very special inorganic structures, tetrapods consisting of four rods at the tetrahedral angle, will always spontaneously align perpendicular to a surface. The possible application of these aligend nanorods in biological detection, photovoltaics, and light emitting diodes will be described briefly. Molecular-Level Devices and Machines Vincenzo Balzani Università di Bologna, ItalyA molecular-level device can be defined as an assembly of a discrete number of molecular components (that is, a supramolecular structure) designed to achieve a specific function. Each molecular component performs a single act, while the entire supramolecular structure performs a more complex function, which results from the cooperation of the various molecular components. Molecular-level devices operate via electronic and/or nuclear rearrangements, and like macroscopic devices they need energy to operate and signals to communicate with the operator. Light is the most important answer to this dual requirement, as shown by Nature where photons are used as energy by the devices responsible for photosynthetic processes and as signals by the devices responsible for vision-related processes. Another useful technique to cause and to monitor the occurrence of electronic and nuclear rearrangements in molecular and supramolecular systems is electrochemistry.In the last few years prototypes of very simple molecular-level machines and molecular-level components related to the construction of molecular-based (chemical) computers have been developed by several research groups. 1 Examples of molecular-level devices and machines investigated in our laboratory will be illustrated and discussed. For many applications manufactured surfaces with engineered structures in the nano-meter range are desirable. The properties of nucleic acids makes them a perfect material for this purpose: Nucleic acids have a regular structure with a 0.34 nm period, through its sequence it is addressable in a nanometer range.Technically we propose to immobilise DNA-oligomers on multiple points in an ordered way. It is important to retain its functional...

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Section: Molecular Nanotechnology Group Ipht Jena Germanymentioning

confidence: 99%

Section: Universität Leipzig Germanymentioning

confidence: 99%

Section: Dna-nanoparticle Assemblies: Structural Basis For the Opticamentioning

confidence: 99%

Section: Universität Bremen Fb 2 -Uft Germanymentioning

confidence: 99%

Section: Universität Bremen Fb 2 -Uft Germanymentioning

confidence: 99%

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