Figure 3 - uploaded by Rabih O. Al-Kaysi
Content may be subject to copyright.
Comparison of fluorescence quenching of polymer nanotubes by a 1.9 mM DSF solution with perylene concentrations of (a) 4.7 mM and (b) 0.1070 M. Dotted lines are before a quencher is added, and solid lines are after the quencher is added. The inset of b shows the fluorescence intensity changes monitored at 473 nm through four cycles of addition and rinsing of the DSF solution.
Source publication
Al(2)O(3) filters (200 nm) are used as templates to form polymer nanotubes containing an energy donor (perylene). The perylene is isolated from chemical interactions but can undergo electronic energy transfer to acceptor molecules in aqueous solutions passing through the membrane. This energy transfer is analyzed quantitatively in terms of both rad...
Contexts in source publication
Context 1
... obtain a Forster radius R 0 ) 5.9 nm. When a 1.9 mM solution of DSF is allowed to saturate the Anodisc whose PMMA tubes are doped with 4.7 mM perylene, there is ∼50% quenching of the steady-state perylene fluorescence accompanied by the appearance of an intense DSF emission, as shown in Figure 3a. We reasoned that the unquenched perylene emission originated from molecules located at large distances from the PMMA-water interface. ...
Context 2
... increasing the perylene concentration, we hoped that energy transfer between perylenes would allow such excitations to diffuse to the interface and be quenched as well. The results for 107 mM perylene/PMMA tubes are shown in Figure 3b. As expected, the quenching of the perylene fluorescence is more complete, but there is the added complication that the perylene emission is now dominated by the excimer species that forms at high concentrations. ...
Context 3
... expected, the quenching of the perylene fluorescence is more complete, but there is the added complication that the perylene emission is now dominated by the excimer species that forms at high concentrations. 9,10 For both perylene concentrations, the quenching effect is reversible, and the filter can be cycled multiple times, as illustrated in the inset to Figure 3b. Thus, from the standpoint of steady-state fluorescence detection, the PMMA nanotubes provide a robust way to detect DSF in solution. ...
Citations
... The aim of this work was to assess whether these single cyclized knot polymers, with high vinyl functionality, could be used as a simple way to create polymer nanotubes. Nanoscale materials with a high aspect ratio, such as nanorods, nanowires and nanotubes, have been synthesized from a variety of different materials for applications ranging from electrical conductors (Abidian, Ludwig, Marzullo, Martin, & Kipke, 2009), enhancing fluid flow (Whitby, Cagnon, Thanou, & Quirke, 2008;Whitby & Quirke, 2007), fluorescence detection (Barone, Baik, Heller, & Strano, 2005;Lee, Müller, Al-Kaysi, & Bardeen, 2006), and biomedical devices (Al-Jamal et al., 2011;Hillebrenner, Buyukserin, Stewart, & Martin, 2006). Since an early report of carbon nanotubes (CNTs) (Iijima, 1991), much research has focused on the application of these graphitic materials for enhancing material strength. ...
Despite concerns over toxicity, carbon nanotubes have been extensively investigated for potential applications in nanomedicine because of their small size, unique properties, and ability to carry cargo such as small molecules and nucleic acids. Herein, we show that polymer nanotubes can be synthesized quickly and easily from a homopolymer of ethylene glycol dimethacrylate (EGDMA). The nanotubes formed via photo-initiated polymerization of the highly functional prepolymer, inside an anodized aluminium oxide template, have a regular structure and large internal pore and can be loaded with a fluorescent dye within minutes representing a simple alternative to multi-walled carbon nanotubes for biomedical applications.
... Their uses span across a variety of fields such as, photodynamic therapy [1], optoelectronic devices [2], lasing applications [3], electrochemical donor acceptors [4], nano devices [5], LCD color filters [6], solar cells [7], medical applications [8], thin films [9] and chemosensors [10]. Perylene-doped polymer nanotubes were selected as a nanostructured material for sensing applications and a study demonstrated that this material can be used as a fluorescence sensor [11]. Perylene-dpa-Zn platform [dpa; bis(2-pyridylmethyl)amine] material was developed as a fluorescent sensor and this sensor exhibited high selectivity for phosphate derivatives [12]. ...
... Finally, we will focus on thermal analysis of ultra thin polyelectrolyte multilayers as one promising characterization technique for LbL tubes. Polymer nanotubes created from porous templates are potentially important in a variety of applications such as controlled drug release, separations, sensing, and molecular probes8910111213. Various polymer nanotubes comprised of neutral polymers (polystyrene, polytetrafluoroethylene ) can be obtained by solution-casting or melt-wetting porous templates such as anodic aluminum oxide (AAO) membranes [14]. ...
Micro- and nanotubes created via layer-by-layer (LbL) assembly offer many new and exciting opportunities in both nanotechnology and nanoscience. The focus in this present review is to highlight practical challenges in fabricating porous and nano-cylindrical templates used to fabricate LbL tubes and to highlight new results in the area. There are inherent difficulties in constructing well defined polymer nanotubes. The first section presents general guidelines and underlying challenges to consider in the construction of LbL tubes and will focus on the ability of polyelectrolyes to diffuse into nanopores to form tubes. The second section highlights on how thermal analysis of LbL tubes can be leveraged to identify properties previously difficult to determine for LbL assemblies and the role of confinement on the glass transition and cross-linking temperature. We envision that great advances may be made particularly in the field of energy using an LbL tube approach.
... The high surface-to-volume ratio allows PNTs to be exposed to and interact with a large amount of analyte molecules. Bardeen et al. prepared PMMA nanotubes containing an electron donor (perylene) [405]. Perylene and disodium fluorescein (DSF) comprise a donor-acceptor system. ...
... When the AAO was excited with UV light, absorbed by the perylene and not the DSF, the perylene fluorescence was quenched while the DSF fluorescence evolved. This was indicative of an efficient Förster type energy transfer from the perylene (donor) inside the PMMA nanotube to the DSF (acceptor) in solution [42]. Solution-based formation of polymer nanotubes is a straightforward method for fabricating them. ...
Organic nanostructures are new comers to the fields of nanoscience and nanotechnology. In recent years novel methods for controlling the growth and uniformity of one-dimensional (1D) organic nanostructures (nanowires and nanotubes) have been developing. The use of hard templates as molds for the formation of organic nanowires or nanotubes seems to be a reliable and convenient method. In this review we will discuss the use of anodic aluminum oxide (AAO) templates as the inorganic hard template of choice. We will briefly survey advances in the fabrication of 1D polymer nanostructures using AAO templates, while the bulk of the review will focus on the synthesis of small molecule nanowires, nanotubes, and nanorods. We will also discuss unique properties of some highly crystalline small molecule nanorods fabricated using AAO templates.
Nanopore, due to its advantages of modifiable, controllability and sensitivity, has made a splash in recent years in the fields of biomolecular sequencing, small molecule detection, salt differential power generation, and biomimetic ion channels, etc. In these applications, the role of chemical or biological modification is indispensable. Compared with small molecules, the modification of polymers is more difficult and the methods are more diverse. Choosing appropriate modification method directly determines the success or not of the research, therefore, it is necessary to summarize the polymer modification methods toward nanopores. In addition, it is also important to provide clear and convincing evidence that the nanopore modification is successful, the corresponding characterization methods are also indispensable. Therefore, this review will summarize the methods of polymer modification of nanopores and efficient characterization methods. And we hope that this review will provide some reference value for like‐minded researchers.
Two-photon absorption and two-photon absorption cross-section of perylene and its derivative dissolved in chloroform and dimethyl sulfoxide were estimated using nonlinear transmission technique. It was found that the studied materials exhibit high two-photon absorption process in ps regime. The value of two-photon absorption cross-section of perylene derivative is higher by a factor of 3 compared to perylene. This fact could be due to longer conjugation length of molecule. However, no solvent effect was observed.
Fluorescence quenching of 9-cyanoanthracene in the blue side of the spectra with
gradual addition of perylene in acetonitrile liquid medium is investigated by using steady state
and time-resolved spectroscopic techniques at the ambient temperature (300 K). The
quenching is ascribed to be due to the concurrent occurrences of (i) photoinduced electron
transfer from ground state perylene (electron donor) to singlet excited 9-cyanoanthracene
(electron acceptor) and (ii) photoinduced excitation energy transfer from singlet excited 9
cyanoanthracene to ground state perylene (radiative as well as non-radiative).
The sequestration of luminophores within supramolecular polyhedral compartments of a crystalline zeolite-like hydrogen-bonded framework illustrates a unique approach to limiting the self-quenching ordinarily exhibited at the high concentrations achievable in this framework. A range of differently sized luminescent guests, namely coumarin 1, coumarin 4, fluorescein, [Ru(bpy)3]Cl2, and rhodamine B, can be encapsulated in amounts of up to one molecule per cage, equivalent to a concentration of 0.175 m, which is significantly higher than the concentration at which aggregation-induced quenching occurs in other media. The luminescence spectra of the encapsulated guests are consistent with the presence of isolated monomers and the absence of self-quenching. The emission color of the single crystals can be tuned readily from blue to red through the choice of guest molecules. These observations promise an approach to organic solid-state lasing compounds if crystals of sufficient size and quality can be prepared.
The sequestration of luminophores within supramolecular polyhedral compartments of a crystalline zeolite-like hydrogen-bonded framework illustrates a unique approach to limiting the self-quenching ordinarily exhibited at the high concentrations achievable in this framework. A range of differently sized luminescent guests, namely coumarin 1, coumarin 4, fluorescein, [Ru(bpy)3]Cl2, and rhodamine B, can be encapsulated in amounts of up to one molecule per cage, equivalent to a concentration of 0.175 m, which is significantly higher than the concentration at which aggregation-induced quenching occurs in other media. The luminescence spectra of the encapsulated guests are consistent with the presence of isolated monomers and the absence of self-quenching. The emission color of the single crystals can be tuned readily from blue to red through the choice of guest molecules. These observations promise an approach to organic solid-state lasing compounds if crystals of sufficient size and quality can be prepared.
