Nanoparticles: Scaffolds for Molecular Recognition

Drechsler, Ulf; Erdogan, Belma; Rotello, Vincent M.

doi:10.1002/chem.200306076

Cited by 216 publications

(144 citation statements)

References 61 publications

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“…[2][3][4][5][6][7] We believe that one field in which these ideas might have a considerable impact is in the development of new chemical signaling protocols. For instance, the blending of models related to chemical sensors and inorganic systems has recently resulted in the preparation of hybrid organic-inorganic materials with enhanced patterns of selectivity.…”

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confidence: 99%

A Simple Approach for the Selective and Sensitive Colorimetric Detection of Anionic Surfactants in Water

et al. 2007

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Since the formulation of supramolecular principles, chemists have been developing systems with enhanced functionalities.[1] More recently, the combination of chemical principles and solid structures has led to new synergic strategies, which embrace unprecedented tunability of the properties of the nanoscopic solids and new perspectives of applicability to supramolecular concepts. [2][3][4][5][6][7] We believe that one field in which these ideas might have a considerable impact is in the development of new chemical signaling protocols. For instance, the blending of models related to chemical sensors and inorganic systems has recently resulted in the preparation of hybrid organic-inorganic materials with enhanced patterns of selectivity. [8][9][10][11][12][13][14][15] In the course of this research we have focused our attention on one type of anion of critical environmental concern, [16][17][18] that is, the anionic surfactants. Surfactants are water-soluble surface-active agents comprised of a hydrophobic portion (a long alkyl chain) attached to a hydrophilic (water-soluble) moiety. Anionic surfactants are of widespread importance in the detergent industry, emulsification, lubrication, catalysis, and so on, and are widely employed. As a result of their anthropogenic origin and extensive use, it is a frequent task to determine surfactants in product formulations and in industrial samples for quality and process control. [19][20][21][22][23] Apart from the efforts in studying methods to reduce their environmental impact, another important aspect is the development of new and improved sensing methods for their determination. Many well-known methodologies require tedious procedures (for example, liquid and gas chromatography) or the use of relatively large amounts of chlorinated solvents that are not readily biodegradable (such as chloroform in the spectroscopic "methylene blue" method), [24] in addition to the fact that these methods cannot usually be used for in situ determinations. A different approach makes use of ion-selective electrodes; however, these still show limitations in their applicability, most commonly related to reproducibility and signal stability. [25][26][27][28][29][30] As a result of these restrictions, there is a real need to develop new methods for anionic surfactant sensing in water that are applicable to a wide range of situations. In this sense, novel selective and sensitive chromo-or fluorogenic methodologies are especially appealing for the design of simple in situ screening applications.As a part of our interest in the development of new chromofluorogenic sensing protocols for target guests, [31][32][33][34][35][36] herein we report a conceptually novel colorimetric method for the selective determination of anionic surfactants based on the use of imidazolium-containing ionic liquids on a solid support. [37][38][39] For this purpose, we have designed and prepared the hybrid system S1 (see Figure 1), which was used in a two-step sensing protocol. In the first step, the contact of S1 with a...

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confidence: 99%

A Simple Approach for the Selective and Sensitive Colorimetric Detection of Anionic Surfactants in Water

et al. 2007

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“…[224][225][226] Miniaturization of sensors to nano-dimensions decreases their typical response time down to the millisecond time scale, exhibiting also spatial resolution at the nanometer scale. Due to their small dimensions, typically smaller than 100 nm, nanosensing probes will find applications in intracellular analysis and in the fabrication of high density sensor arrays.…”

Section: Nanoparticlesmentioning

confidence: 99%

Design of Fluorescent Materials for Chemical Sensing

2007

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There is an enormous demand for chemical sensors for many areas and disciplines. High sensitivity and ease of operation are two main issues for sensor development. Fluorescence techniques can easily fulfill these requirements and therefore fluorescent-based sensors appear as one of the most promising candidates for chemical sensing. However, the development of sensors is not trivial; material science, molecular recognition and device implementation are some of the aspects that play a role in the design of sensors. The development of fluorescent sensing materials is increasingly captivating the attention of the scientists because its implementation as a truly sensory system is straightforward. This critical review shows the use of polymers, sol-gels, mesoporous materials, surfactant aggregates, quantum dots, and glass or gold surfaces, combined with different chemical approaches for the development of fluorescent sensing materials. Representative examples have been selected and they are commented here.

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“…In this context, nanosized catalysts have recently become a hot topic of interest because of their high surface area that results in outstanding activity (Jiang and Gao 2006;Korneva et al 2005). As particle size decreases by reaching nanodimension, gradual transformation, from the bulk in the solid-state to the molecular level occurs (Drechsler et al 2004). By tailoring the size and shape of metal nanoparticles, one can alter and enhance their intrinsic properties for diverse applications.…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted synthesis of platinum nanoparticles and their catalytic degradation of methyl violet in aqueous solution

et al. 2012

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A green synthesis of polyvinylpyrrolidone stabilized platinum nanoparticles (PtNPs) has been done by microwave irradiation in the presence of glucose. The formation process of the PtNPs is pursued by UV-visible spectroscopy. The morphology of the PtNPs was characterized by transmission electron microscopy and X-ray diffraction techniques. Catalytic activity of the above PtNPs has been substantiated through photodecolorization of aqueous methyl violet solution.

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Nanoparticles: Scaffolds for Molecular Recognition

Cited by 216 publications

References 61 publications

A Simple Approach for the Selective and Sensitive Colorimetric Detection of Anionic Surfactants in Water

A Simple Approach for the Selective and Sensitive Colorimetric Detection of Anionic Surfactants in Water

Design of Fluorescent Materials for Chemical Sensing

Microwave-assisted synthesis of platinum nanoparticles and their catalytic degradation of methyl violet in aqueous solution

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