Molecular Imaging of Thermochromic Carbohydrate-Modified Polydiacetylene Thin Films

Lio, Anna; Reichert, A.; Ahn, Dong June; Nagy, Jon O.; Salmerón, Miquel; Charych, Deborah H.

doi:10.1021/la970406y

Cited by 139 publications

(173 citation statements)

References 38 publications

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“…[28][29][30] However, recent infrared spectroscopy and AFM studies of PDA films suggest that the side chains of "red phase" PDAs induced by thermal treatment are in an equally or more ordered conformation than those in "blue phase" PDAs. 7,8 A compromised explanation suggests that the alkyl side chains in the "red phase" remain in an ordered conformation, with only a slightly different packing mode from the "blue phase". 31 More recent investigation of the temperature dependence of visible absorption spectra and the electron diffractions of PDA films revealed that the electronic natures of the PDAs are strongly dependent on their resonance backbone structures as well as the stacking of the main chains.…”

Section: Discussionmentioning

confidence: 99%

“…1). Amphiphilic diacetylene lipids have been polymerized to form single crystals, 4,5 Langmuir-Blodgett films, 3,[6][7][8] self-assembled monolayers, 9 and vesicles [10][11][12][13] and ribbons 14,15 in aqueous solution. Recently, immobilization of disulfide-modified PDA vesicles on gold surfaces 16 and amine-terminated vesicles on aldehyde-functionalized glass slides 17 were reported.…”

Section: Introductionmentioning

confidence: 99%

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Functional Self-Assembling Bolaamphiphilic Polydiacetylenes as Colorimetric Sensor Scaffolds

2004

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ABSTRACT. Conjugated polymers capable of responding to external stimuli by changes in optical, electrical or electrochemical properties can be used for the construction of direct sensing devices.Polydiacetylene-based systems are attractive for sensing applications due to their colorimetric response to changes in the local environment. Here we present the design, preparation and characterization of self-assembling functional bolaamphiphilic polydiacetylenes (BPDAs) inspired by Nature's strategy for membrane stabilization. We show that by placing polar headgroups on both ends of the diacetylene lipids in a transmembranic fashion, and altering the chemical nature of the polar surface residues, the conjugated polymers can be engineered to display a range of radiation-, thermaland pH-induced colorimetric responses. We observed dramatic nanoscopic morphological 2 transformations accompanying charge-induced chromatic transitions, suggesting that both side chain disordering and main chain rearrangement play important roles in altering the effective conjugation lengths of the poly(ene-yne). These results establish the foundation for further development of BPDAbased colorimetric sensors. Introduction:

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Functional Self-Assembling Bolaamphiphilic Polydiacetylenes as Colorimetric Sensor Scaffolds

2004

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“…Further compression of the film to 35 mN/m results in a stable film with MMA = 9 2 /molecule. It was therefore assumed that the film is organized into a trilayer superstructure [26]. Photopolymerization was carried out with a hand-held UV lamp (254 nm).…”

Section: Methodsmentioning

confidence: 99%

Uniaxial Alignment of Cadmium Sulfide on Polymerized Films: Electron Microscopy and Diffraction Study

Berman

Charych²

1999

Adv. Mater.

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Gaining control over crystal growth continues to be the focus of many modern research efforts, motivated by the possibility of producing particles of well-defined orientation, size, morphology, and structure. One strategy of controlling crystal growth borrows from biological systems, which routinely demonstrate precise control over crystal growth, by utilizing organic macromolecular ªtemplatesº or crystal ªmodifiersºÐa process broadly known as biomineralization.[1] One prominent attribute of biologically controlled crystal nucleation is crystallite co-alignment and the formation of ordered arrays. This is achieved, primarily, by the long-range order of the underlying organic matrix that templates the inorganic deposits.[2] Other characteristics of biomineralized materials include enhanced mechanical strength (due to their composite nature), uniform crystallite size and morphology, and correlation between the morphology of the inorganic constructs and their crystallography.[1±4]Using biological materials as models, simpler organic template structures, such as vesicles, reverse micelles, and surfactant thin films (e.g., Langmuir monolayers or self-assembled monolayers) are also shown to direct the orientation of a variety of crystals grown at their interfaces. [5] Structural relationships between the crystal and the artificial organic ªmatrixº can sometimes be derived or postulated. A variety of amphiphilic molecules have been shown to direct the crystallization of ionic crystals such as calcite [6,7] and other minerals. [8] Recently, this approach has been extended to the development of methods for controlling the orientation and size of semiconducting particles, a field in which a variety of other methods of controlling nucleation, [9,10] growth, [11,12] and organization [13±17] are being explored. The motivation for these studies is the technological need for tunable bandgap energy and optical properties. [18] Particle size and surface doping with organic compounds of the particles influence these properties. [19±22] Surfactant thin films (particularly fatty acids) have been shown to direct the growth of size-quantized semiconductor nanoparticles and nanoparticulate films of CdS or CdSe. [9,23] Independent of these studies, the detailed structural features and the capability of Langmuir monolayers to induce three-dimensional crystal growth at the air±solu-tion interface has been investigated. [24] Precise structural parameters of long-chain acids on subphases containing cadmium ions were measured with grazing-incidence X-ray diffraction (GIXRD), leading to the conclusion that Cd 2+ ions assume a supercell organization that is not directly juxtaposed over the carboxylate lattice.[25] Therefore, attempts to imply lattice match between an assumed structure of the fatty acid monolayer and the templated crystalline cadmium sulfide should be made with caution. It is suggested, therefore, that transfer of structural information between a cadmium salt monolayer and the templated clusters may not be based on simple ...

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“…Islands of multilayer PDA are also visible. The monolayer regions are polycrystalline, and each domain can be identified by the orientation of the striations visible in the phase image along which the PDA backbones lie [12,17]. The typical phase f in Fig.…”

mentioning

confidence: 99%

Material Anisotropy Revealed by Phase Contrast in Intermittent Contact Atomic Force Microscopy

et al. 2002

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Molecular Imaging of Thermochromic Carbohydrate-Modified Polydiacetylene Thin Films

Cited by 139 publications

References 38 publications

Functional Self-Assembling Bolaamphiphilic Polydiacetylenes as Colorimetric Sensor Scaffolds

Functional Self-Assembling Bolaamphiphilic Polydiacetylenes as Colorimetric Sensor Scaffolds

Uniaxial Alignment of Cadmium Sulfide on Polymerized Films: Electron Microscopy and Diffraction Study

Material Anisotropy Revealed by Phase Contrast in Intermittent Contact Atomic Force Microscopy

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