Ordered arrangements of metal nanoparticles on alpha-cyclodextrin inclusion complexes by magnetron sputtering

Barrientos, Lorena; Allende, Patricio; Orellana, Claudia; Jara, Paul

doi:10.1016/j.ica.2011.10.032

Cited by 14 publications

(7 citation statements)

References 43 publications

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“…Barrientos et al . [ 20 ] reported the PXRD patterns of several other hexagonal crystal structures, including the complexes of α-CD (host) with 1-octylamine and 1-octanethiol (guests). These results suggested that the PXRD pattern of the crystalline RALA-αCD complex indicated that the RALA-αCD molecules were put the channel structures in order through two dimensional network interactions between the guest and the host (α-CD) molecules, with the α-CD network running parallel to the hexagonal faces.…”

Section: Resultsmentioning

confidence: 99%

“…Furthermore, the results of PXRD and 1 H-NMR show that the crystalline RALA-αCD complex is a channel type 2:3 (RALA:α-CD) complex. Barrientos and co-workers [ 20 ] synthesized α-CD/C 8 H 17 SH (1-octanethiol) and 2α-CD/C 8 H 17 NH 2 (octylamine) complexes and evaluated their physic-chemical properties using PXRD, SEM imaging, and Raman spectroscopy. They showed that 2α-CD/C 8 H 17 NH 2 crystals had hexagonal shape and in the crystal structure, the supramolecular complexes were put in the channel structures in order.…”

Section: Discussionmentioning

confidence: 99%

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Structural Analysis of Crystalline R(+)-α-Lipoic Acid-α-cyclodextrin Complex Based on Microscopic and Spectroscopic Studies

Ikuta

Endo

Hosomi

et al. 2015

IJMS

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R(+)-α-lipoic acid (RALA) is a naturally-occurring substance, and its protein-bound form plays significant role in the energy metabolism in the mitochondria. RALA is vulnerable to a variety of physical stimuli, including heat and UV light, which prompted us to study the stability of its complexes with cyclodextrins (CDs). In this study, we have prepared and purified a crystalline RALA-αCD complex and evaluated its properties in the solid state. The results of 1H NMR and PXRD analyses indicated that the crystalline RALA-αCD complex is a channel type complex with a molar ratio of 2:3 (RALA:α-CD). Attenuated total reflection/Fourier transform infrared analysis of the complex showed the shift of the C=O stretching vibration of RALA due to the formation of the RALA-αCD complex. Raman spectroscopic analysis revealed the significant weakness of the S–S and C–S stretching vibrations of RALA in the RALA-αCD complex implying that the dithiolane ring of RALA is almost enclosed in glucose ring of α-CD. Extent of this effect was dependent on the direction of the excitation laser to the hexagonal morphology of the crystal. Solid-state NMR analysis allowed for the chemical shift of the C=O peak to be precisely determined. These results suggested that RALA was positioned in the α-CD cavity with its 1,2-dithiolane ring orientated perpendicular to the plane of the α-CD ring.

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Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Structural Analysis of Crystalline R(+)-α-Lipoic Acid-α-cyclodextrin Complex Based on Microscopic and Spectroscopic Studies

Ikuta

Endo

Hosomi

et al. 2015

IJMS

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“…The amine/cyclodextrin molar ratios used in the experiments were 2:1. The crystals were filtered and dried under vacuum [ 27 , 28 ].…”

Section: Methodsmentioning

confidence: 99%

In Situ Visualization of the Local Photothermal Effect Produced on α-Cyclodextrin Inclusion Compound Associated with Gold Nanoparticles

et al. 2016

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Evidence of guest migration in α-cyclodextrin-octylamine (α-CD-OA) inclusion compound (IC) generated via plasmonic heating of gold nanoparticles (AuNPs) has been studied. In this report, we demonstrate local effects generated by laser-mediated irradiation of a sample of AuNPs covered with inclusion compounds on surface-derivatized glass under liquid conditions by atomic force microscopy (AFM). Functionalized AuNPs on the glass and covered by the ICs were monitored by recording images by AFM during 5 h of irradiation, and images showed that after irradiation, a drastic decrease in the height of the AuNPs occurred. The absorption spectrum of the irradiated sample showed a hypsochromic shift from 542 to 536 nm, evidence suggesting that much of the population of nanoparticles lost all of the parts of the overlay of ICs due to the plasmonic heat generated by the irradiation. Mass spectrometry matrix-assisted laser desorption/ionization-time-of-flight (MALDI-TOF) performed on a sample containing a collection of drops obtained from the surface of the functionalized glass provided evidence that the irradiation lead to disintegration of the ICs and therefore exit of the octylamine molecule (the guest) from the cyclodextrin cavity (the matrix).Graphical AbstractAtomic Force Microscopy observation of the disintegration of a cyclodextrin inclusion compound by gold nanoparticles photothermal effectElectronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1322-z) contains supplementary material, which is available to authorized users.

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“…[34][35][36] In this sense, our group made an innovation of this method through macromolecular systems, allowing the stabilization of ordered arrangements of metal nanoparticles, and thus improving the size dispersion and particle diameter. [37] Here we report an alternative and more versatile method to growth AgNPs by PVD on nanocrystalline titanium dioxide using a bifunctional surface modifier such as the mercaptoacetic acid (HSCH 2 COOH) type. Combining the efficient photocatalytic activity of titania with the excellent electron acceptor abilities and surface plasmon resonance of AgNPs, it was possible to achieve a very efficient organic pollutant photodegradation.…”

Section: Introductionmentioning

confidence: 99%

Controlled Ag-TiO 2 heterojunction obtained by combining physical vapor deposition and bifunctional surface modifiers

Barrientos

Allende

Laguna‐Bercero

et al. 2018

Journal of Physics and Chemistry of Solids

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A controlled physical method without any solvent was developed to growth Ag nanoparticles on TiO 2 through using mercaptoacetic acid as bifunctional surface modifier. The fabricated Ag-TiO 2 particles were proposed as an innovative photocatalytic material. The particle size, chemical nature, morphology and chemical bonding between the mercaptoacetic acid, silver and titania have been characterized by UV-vis Absorption Spectroscopy, Powder X-Ray Diffraction, Raman Spectroscopy, Transmission Electron Microscopy and Field Emission Scanning Electron Microscopy. Combining the photocatalytic activity of titania with the excellent electron acceptor abilities and visible absorption of small spherical silver nanoparticles, it was possible to demonstrate an efficient photo-induced degradation of cationic organic pollutant under UV-Vis light. The nanocatalyst material obtained at 30s of sputtered time under simulated sunlight provides almost complete degradation (97%) of methylene blue after 120 min. The particle-size and distribution of silver nanoparticles have been achieved for the first time by a physical method using controlled chemical bonding to bifunctional surface modifiers and the sputter deposition time.

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Ordered arrangements of metal nanoparticles on alpha-cyclodextrin inclusion complexes by magnetron sputtering

Cited by 14 publications

References 43 publications

Structural Analysis of Crystalline R(+)-α-Lipoic Acid-α-cyclodextrin Complex Based on Microscopic and Spectroscopic Studies

Structural Analysis of Crystalline R(+)-α-Lipoic Acid-α-cyclodextrin Complex Based on Microscopic and Spectroscopic Studies

In Situ Visualization of the Local Photothermal Effect Produced on α-Cyclodextrin Inclusion Compound Associated with Gold Nanoparticles

Controlled Ag-TiO 2 heterojunction obtained by combining physical vapor deposition and bifunctional surface modifiers

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