Showing papers in "Advanced Materials in 1996"
TL;DR: In this paper, a new, versatile and environmentally benign synthesis approach by polymer melt intercalation is discussed. But, unlike in-situ polymerization and solution inter-calation, melt interalation involves mixing the layered silicates with the polymer and heating the mixture above the softening point of the polymer.
Abstract: Polymer nanocomposites with layered silicates as the inorganic phase (reinforcement) are discussed. The materials design and synthesis rely on the ability of layered silicates to intercalate in the galleries between their layers a wide range of monomers and polymers. Special emphasis is placed on a new, versatile and environmentally benign synthesis approach by polymer melt intercalation. In contrast to in-situ polymerization and solution intercalation, melt intercalation involves mixing the layered silicate with the polymer and heating the mixture above the softening point of the polymer. Compatibility with various polymers is accomplished by derivatizing the silicates with alkyl ammonium cations via an ion exchange reaction. By fine-tuning the surface characteristics nanodispersion (i. e. intercalation or delamination) can be accomplished. The resulting polymer layered silicate (PLS) nanocomposites exhibit properties dramatically different from their more conventional counterparts. For example, PLS nanocomposites can attain a particular degree of stiffness, strength and barrier properties with far less inorganic content than comparable glass- or mineral reinforced polymers and, therefore, they are far lighter in weight. In addition, PLS nanocomposites exhibit significant increase in thermal stability as well as self-extinguishing characteristics. The combination of improved properties, convenient processing and low cost has already led to a few commercial applications with more currently under development.
3,468 citations
TL;DR: In this article, a series of gold nanocrystals, passivated by self-assembled monolayers (SAMs) of straight-chain alkylthiolate molecules (RS, R) are described.
Abstract: The creation of perfect nanometer-scale crystallites (nanocrystals), identically replicated in unlimited quantities, in a state that can be manipulated and understood as pure macromolecular substances, is an ultimate challenge of modern materials research with outstanding fundamental and potential technological consequences.[’l We report on the prediction, isolation, and characterization of a series of gold nanocrystals, passivated by self-assembled monolayers (SAMs) of straight-chain alkylthiolate molecules (RS, R
1,097 citations
TL;DR: The preparation and characterization of ultrathin films composed of self-assembled graphite oxide (GO) platelets and polyelectrolytes and the subsequent in situ reduction of GO to a conductive graphite-like state by chemical and electrochemical methods are the subject of the present communication.
Abstract: The preparation and characterization of ultrathin films composed of self-assembled graphite oxide (GO) platelets and polyelectrolytes and the subsequent in situ reduction of GO to a conductive graphite-like state by chemical and electrochemical methods are the subject of the present communication
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TL;DR: Mono-thiophene as mentioned in this paper is a mono-orthiophene, which is a polygonal polysilicon-polysilicon derivative of thiophene.
Abstract: mono-thiophene
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IBM1
TL;DR: In this article, a review demonstrates that STM effectively tests new types of control over the microscopic structure of self-assembled monolayers on gold that should prove useful to their application.
Abstract: Self-assembled monolayers (SAMs) of alkanethiols and disulfides on gold form organic interfaces with properties largely controlled by the end groups of the molecules composing the film. SAMs provide a unique link between the science of organic surfaces and technologies that seek to exploit their adaptable character. Many techniques are useful for probing the structure of SAMs although only scanning tunneling microscopy (STM) at picoamperes reveals the details of the packing of their end groups at the sub-angstrom level. This review demonstrates that STM effectively tests new types of control over the microscopic structure–property relationships characteristic of SAMs on gold that should prove useful to their application.
TL;DR: In this paper, the authors used triphenylamines as hole trapping groups, phenylacetylene segments for energy transfer, and 9,10-bis(phenylethynyl)-anthracene as the luminophor.
Abstract: : Electroluminescent devices have been constructed using luminescent dendritic materials as the organic emitting layer. These dendritic macromolecules consisted of triphenylamines as the hole trapping groups, phenylacetylene segments for energy transfer, and 9,10-bis(phenylethynyl)-anthracene as the luminophor. These highly ordered, three-dimensional, covalent structures allow a modular approach to the design and construction of electroluminescent materials. X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM) indicated that dendrimers of generation greater than 3 formed uniform, crack-free films of thickness 600-1200 A. Incorporation of triphenylamine units as hole trapping groups in dendrimer 2b increased the current density and lowered the turn on voltage as compared with its hydrocarbon analog 1c. Efficient energy transfer from phenylacetylene segments to the anthracene core is demonstrated by spectroscopic studies (absorption, emission, and excitation spectra). In the forward bias, these light emitting diodes (LEDs) radiate dim orange light. jg
TL;DR: In this paper, the authors consider that registered names, trademarks, etc. are not to be considered unprotected by law, even without soecific indications thereof, and they propose an approach to protect them.
Abstract: Registered names, trademarks, etc. used in this journal, even without soecific. indications thereof. are not to be considered unprotected by law. Printed in the Federal Republic of Germany
TL;DR: The first dendritic liquid crystalline polymer (DLCP) consisting of a flexible, second-generation carbo-silane scaffold substituted with 36 rigid cyanobiphenyl groups has been prepared as discussed by the authors.
Abstract: The first dendritic liquid crystalline polymer (DLCP), consisting of a flexible, second-generation dendritic carbo-silane scaffold substituted with 36 rigid cyanobiphenyl groups (see Figure), has been prepared. The synthesis and characterization of the mesophase are reported as an initial approach to determining how the formation of liquid crystal phases is related to the mesogen density and the spacer length in DLCPs.