In situ synthesis of Ag nanoparticles in aminocalix[4]arene multilayers

Gao, Shuiying; Yuan, Daqiang; Lü, Jian; Cao, Rong

doi:10.1016/j.jcis.2009.09.025

Cited by 18 publications

(7 citation statements)

References 58 publications

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“…[1][2][3][4][5] With such properties, calixarenes have been used in detecting metallic ions, such as alkaline [6][7][8] and alkaline earth [8][9][10] metals, cadmium, [10][11][12] copper, 7,13,14 and for incorporating neutral molecules, [15][16][17][18][19][20] including dopamine, 15 volatile organic compounds 16 and aminoacids. 17 They have also been studied in biological membranes, [18][19][20] and in the formation of molecularly organized films using self-assembled monolayers [21][22][23] and LangmuirBlodgett (LB) [6][7][8][9][10][11][12][13][15][16][17][18][19][20] techniques. These organized films have been applied in metal ion sensors, biosensors, immunosensors and for encapsulating nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Interaction of para-tert-butylcalix[6]arene molecules in Langmuir films with cadmium ions and their effects on molecular conformation and surface potential

Wrobel

Santos

Lazzarotto

et al. 2014

Phys. Chem. Chem. Phys.

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In this paper, we employ the surface-specific polarization-modulated infrared reflection absorption spectroscopy (PM-IRRAS) and sum-frequency generation (SFG) methods with surface pressure and surface potential isotherms to determine the organization of p-tert-butylcalix[6]arene molecules and their interaction with Cd 2+ ions in Langmuir monolayers. The area per molecule was estimated to be 135 Å 2 , which corresponds to the Calix6 axis perpendicular to the air-water interface with most OH groups parallel to the interface. This area is larger than predicted by molecular modeling with quantum chemical calculations with a PM3 Hamiltonian (109 Å 2 ), which is ascribed to the repulsion between Calix6 molecules. The incorporation of Cd 2+ ions in the subphase leads to drastic changes in the dipole moment contribution of the monolayer surface potential. Rather than increasing with incorporation of Cd 2+ ions owing to a decrease in the negative double-layer potential, the measured surface potential decreased monotonically with increasing ion concentration. This unexpected result was ascribed to a strong interaction with Cd 2+ ions that induced the calyx of the molecule to adopt a more open conformation at the air/water interface and affected the orientation of hydration water molecules, according to the SFG data. This finding allows us to understand the reason why the Gouy-Chapman model fails to explain surface potential results for subphases containing divalent or trivalent ions, and may be relevant for the application of calixarenes in sensing.

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Section: Introductionmentioning

confidence: 99%

Interaction of para-tert-butylcalix[6]arene molecules in Langmuir films with cadmium ions and their effects on molecular conformation and surface potential

Wrobel

Santos

Lazzarotto

et al. 2014

Phys. Chem. Chem. Phys.

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“…At the beginning, only electrostatic interactions were utilized for LbL assembly. Subsequently, other interactions such as covalent bond,38–44 hydrogen bonding,45–51 charge transfer,52, 53 hydrophobic,54–56 host–gest,57–60 and coordination bond61–67 interactions have been investigated to facilitate polymer association for ultrathin film deposition. The most important concept for LbL assembly is how to use the interactions between the polymeric materials.…”

Section: Introductionmentioning

confidence: 99%

Layer‐by‐Layer Assembly Through Weak Interactions and Their Biomedical Applications

et al. 2011

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The surface design and control of substrates with nanometer- or micrometer-sized polymer films are of considerable interest for both fundamental and applied studies in the biomedical field because of the required surface properties. The layer-by-layer (LbL) technique was discovered in 1991 by Decher and co-workers for the fabrication of polymer multilayers constructed mainly through electrostatic interaction. The scope and applicability of this LbL assembly has been extended by introducing molecularly regular conformations of polymers or proteins by employing, for the first time, weak interactions such as van der Waals interactions and biological recognition. Since these weak interactions are the sum of the attractive or repulsive forces between parts of the same molecule, they allow macromolecules to be easily arranged into the most stable conformation in a LbL film. By applying this characteristic feature, the template polymerization of stereoregular polymers, stereoregular control of surface biological properties, drastic morphological control of biodegradable nano materials, and the development of three-dimensional cellular multilayers as a tissue model were successfully achieved. It is expected that LbL assembly using weak interactions will promote further interest into fundamental and applied studies on the design of surface chemistry in the biomedical field.

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“…In fact, Cao and coworkers have used LbL films consisting of tetraamino-CA[n]s as nano-reactors to synthesize silver (Ag) nanoparticles ( Figure 3) [50]. Ag + ions were selectively bound into the cavity of CA[n]s in the LbL film from the solution through π-cation interactions [51,52], followed by in situ reduction of Ag + ions to Ag nanoparticles.…”

Section: Ca[n]-containing Lbl Filmsmentioning

confidence: 99%

Host-Guest Chemistry in Layer-by-Layer Assemblies Containing Calix[n]arenes and Cucurbit[n]urils: A Review

2018

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In situ synthesis of Ag nanoparticles in aminocalix[4]arene multilayers

Cited by 18 publications

References 58 publications

Interaction of para-tert-butylcalix[6]arene molecules in Langmuir films with cadmium ions and their effects on molecular conformation and surface potential

Interaction of para-tert-butylcalix[6]arene molecules in Langmuir films with cadmium ions and their effects on molecular conformation and surface potential

Layer‐by‐Layer Assembly Through Weak Interactions and Their Biomedical Applications

Host-Guest Chemistry in Layer-by-Layer Assemblies Containing Calix[n]arenes and Cucurbit[n]urils: A Review

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