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Matienko LI, Mil EM, Albantova AA, Goloshchapov AN. The Role H-Bonding and Supramolecular Structures in Homogeneous and Enzymatic Catalysis. Int J Mol Sci 2023; 24:16874. [PMID: 38069195 PMCID: PMC10707003 DOI: 10.3390/ijms242316874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 11/22/2023] [Accepted: 11/23/2023] [Indexed: 12/18/2023] Open
Abstract
The article analyzes the role of hydrogen bonds and supramolecular structures in enzyme catalysis and model systems. Hydrogen bonds play a crucial role in many enzymatic reactions. However, scientists have only recently attempted to harness the power of hydrogen bonds in homogeneous catalytic systems. One of the newest directions is associated with attempts to control the properties of catalysts by influencing the "second coordination sphere" of metal complexes. The role H-bonding, and the building of stable supramolecular nanostructures due to intermolecular H-bonds, based on catalytic active heteroligand iron (Fe) or nickel (Ni) complexes formed during hydrocarbon oxidations were assessed via the AFM (Atomic-force microscopy) method, which was proposed and applied by authors of this manuscript. Th is article also discusses the roles of hydrogen bonds and supramolecular structures in oxidation reactions catalyzed by heteroligand Ni and Fe complexes, which are not only effective homogeneous catalysts but also structural and functional models of Oxygenases.
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Affiliation(s)
- Ludmila I. Matienko
- N.M. Emanuel Institution of Biochemical Physics Russian Academy of Science, 4 Kosygin Str., 119334 Moscow, Russia; (E.M.M.); (A.A.A.); (A.N.G.)
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2
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Sugioka H, Nakamura H. The weaving of the carbon fiber using induced-charge electro-osmosis with DC–AC alternating switching. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2022.130190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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3
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Juráková J, Midlikova J, Hrubý J, Kliuikov A, Santana VT, Pavlik J, Moncol J, Cizmar E, Orlita M, Mohelsky I, Neugebauer P, Gentili D, Cavallini M, Salitros I. Pentacoordinate Cobalt(II) Single Ion Magnets with Pendant Alkyl Chains: Shall We Go for Chloride or Bromide? Inorg Chem Front 2022. [DOI: 10.1039/d1qi01350e] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Four pentacoordinate complexes 1-4 of the type [Co(L1)X2] and [Co(L2)X2] (where L1=2,6-bis(1-octyl-1H-benzimidazol-2-yl)pyridine for 1 and 2, L2=2,6-bis(1-dodecyl-1H-benzimidazol -2-yl)-pyridine for 3 and 4; X = Cl- for 1 and 3, X...
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4
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Ko J, Berger R, Lee H, Yoon H, Cho J, Char K. Electronic effects of nano-confinement in functional organic and inorganic materials for optoelectronics. Chem Soc Rev 2021; 50:3585-3628. [DOI: 10.1039/d0cs01501f] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review provides a comprehensive overview of the electronic effects of nano-confinement (from 1D to 3D geometries) on optoelectronic materials and their applications.
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Affiliation(s)
- Jongkuk Ko
- Department of Chemical and Biological Engineering
- Korea University
- Seoul 02841
- Republic of Korea
- School of Chemical & Biological Engineering
| | - Rüdiger Berger
- Physics at Interfaces
- Max Planck Institute for Polymer Research
- D-55128 Mainz
- Germany
| | - Hyemin Lee
- Department of Chemical & Biomolecular Engineering
- Seoul National University of Science & Technology
- Seoul 01811
- Republic of Korea
| | - Hyunsik Yoon
- Department of Chemical & Biomolecular Engineering
- Seoul National University of Science & Technology
- Seoul 01811
- Republic of Korea
| | - Jinhan Cho
- Department of Chemical and Biological Engineering
- Korea University
- Seoul 02841
- Republic of Korea
- KU-KIST Graduate School of Converging Science and Technology
| | - Kookheon Char
- School of Chemical & Biological Engineering
- Seoul National University
- Seoul 08826
- Republic of Korea
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5
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Di Silvio L, Lunedei E, Gentili D, Barbalinardo M, Manet I, Milita S, Liscio F, Fraleoni-Morgera A, Cavallini M. Combined wet lithography and fractional precipitation as a tool for fabrication of spatially controlled nanostructures of poly(3-hexylthiophene) ordered aggregates. NANOSCALE 2020; 12:1432-1437. [PMID: 31912835 DOI: 10.1039/c9nr10057a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Herein, we propose an easy and practical method for the fabrication of highly ordered supramolecular structures. The proposed approach combines fractional precipitation and wet lithography, to obtain a spatially-defined pattern of submicrometric structures with a high molecular order of poly(3-hexylthiophene). The process is demonstrated by XRD, confocal and time-resolved spectroscopy and by the performance of an effective field effect transistor.
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Affiliation(s)
- Lorena Di Silvio
- Istituto per lo Studio dei Materiali Nanostrutturati, Consiglio Nazionale delle Ricerche, via Gobetti 101, 40129 Bologna, Italy.
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6
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Gentili D, Manet I, Liscio F, Barbalinardo M, Milita S, Bettini C, Favaretto L, Melucci M, Fraleoni-Morgera A, Cavallini M. Control of polymorphism in thiophene derivatives by sublimation-aided nanostructuring. Chem Commun (Camb) 2020; 56:1689-1692. [DOI: 10.1039/c9cc09507a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Here we applied the concept of “sublimation-aided nanostructuring” to control the polymorphism of a model material.
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Affiliation(s)
- Denis Gentili
- Istituto per lo Studio dei Materiali Nanostrutturati (ISMN)
- CNR
- 40129 Bologna
- Italy
| | - Ilse Manet
- Istituto per la Sintesi Organica e la Fotoreattività
- CNR
- 40129 Bologna
- Italy
| | - Fabiola Liscio
- Istituto per la Microelettronica e Microsistemi
- CNR
- 40129 Bologna
- Italy
| | | | - Silvia Milita
- Istituto per la Microelettronica e Microsistemi
- CNR
- 40129 Bologna
- Italy
| | - Cristian Bettini
- Istituto per la Sintesi Organica e la Fotoreattività
- CNR
- 40129 Bologna
- Italy
| | - Laura Favaretto
- Istituto per la Sintesi Organica e la Fotoreattività
- CNR
- 40129 Bologna
- Italy
| | - Manuela Melucci
- Istituto per la Sintesi Organica e la Fotoreattività
- CNR
- 40129 Bologna
- Italy
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7
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Khorloo M, Cheng Y, Zhang H, Chen M, Sung HHY, Williams ID, Lam JWY, Tang BZ. Polymorph selectivity of an AIE luminogen under nano-confinement to visualize polymer microstructures. Chem Sci 2019; 11:997-1005. [PMID: 34084354 PMCID: PMC8146380 DOI: 10.1039/c9sc04239c] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Despite the huge progress of luminescent molecular assemblies over the past decade, it is still challenging to understand their confined behavior in semi-crystalline polymers for constrained space recognition. Here, we report a polymorphic luminogen with aggregation-induced emission (AIE), capable of selective growth in polymer amorphous and crystalline phases with distinct color. The polymorphic behaviors of the AIE luminogen embedded within the polymer network are dependent on the size of nano-confinement: a thermodynamically stable polymorph of the AIE luminogen with green emission is stabilized in the amorphous phase, while a metastable polymorph with yellow emission is confined in the crystalline phase. The information on polymer crystalline and amorphous phases is transformed into distinct fluorescence colors, allowing a single AIE luminogen as a fluorescent marker for visualization of polymer microstructures in terms of amorphous and crystalline phase distribution, quantitative polymer crystallinity measurement, and spatial morphological arrangement. Our findings demonstrate that confinement of the AIE luminogen in the polymer network can achieve free space recognition and also provide a correlation between microscopic morphologies and macroscopic optical signals. We envision that our strategy will inspire the development of other materials with spatial confinement to incorporate AIE luminogens for various applications. A polymorphic AIEgen is capable of selective growth in amorphous and crystalline polymer phases with distinct color for microstructure visualization.![]()
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Affiliation(s)
- Michidmaa Khorloo
- Department of Chemistry, The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study and Development of Chemical and Biological Engineering, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China
| | - Yanhua Cheng
- Department of Chemistry, The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study and Development of Chemical and Biological Engineering, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China .,State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University Shanghai 201620 China
| | - Haoke Zhang
- Department of Chemistry, The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study and Development of Chemical and Biological Engineering, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China .,HKUST-Shenzhen Research Institute No. 9 Yuexing 1st RD, South Area, Hi-tech Park, Nanshan Shenzhen 518057 China
| | - Ming Chen
- Department of Chemistry, The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study and Development of Chemical and Biological Engineering, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China
| | - Herman H Y Sung
- Department of Chemistry, The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study and Development of Chemical and Biological Engineering, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China
| | - Ian D Williams
- Department of Chemistry, The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study and Development of Chemical and Biological Engineering, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China
| | - Jacky W Y Lam
- Department of Chemistry, The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study and Development of Chemical and Biological Engineering, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China .,HKUST-Shenzhen Research Institute No. 9 Yuexing 1st RD, South Area, Hi-tech Park, Nanshan Shenzhen 518057 China
| | - Ben Zhong Tang
- Department of Chemistry, The Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction, Institute for Advanced Study and Development of Chemical and Biological Engineering, The Hong Kong University of Science and Technology Clear Water Bay Kowloon Hong Kong China .,HKUST-Shenzhen Research Institute No. 9 Yuexing 1st RD, South Area, Hi-tech Park, Nanshan Shenzhen 518057 China.,Center for Aggregation-Induced Emission, SCUT-HKUST Joint Research Institute, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology Guangzhou China
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8
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Xu JP, Zhu JT. Block Copolymer Colloidal Particles with Unique Structures through Three-dimensional Confined Assembly and Disassembly. CHINESE JOURNAL OF POLYMER SCIENCE 2019. [DOI: 10.1007/s10118-019-2294-0] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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9
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Gentili D, Gazzano M, Melucci M, Jones D, Cavallini M. Polymorphism as an additional functionality of materials for technological applications at surfaces and interfaces. Chem Soc Rev 2019; 48:2502-2517. [DOI: 10.1039/c8cs00283e] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This tutorial aims to divulge to the chemistry community the information that polymorphism can be directly exploited as a property in a variety of technological applications.
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Affiliation(s)
- Denis Gentili
- Istituto per lo Studio dei Materiali Nanostrutturati (ISMN)
- Consiglio Nazionale delle Ricerche (CNR)
- 40129 Bologna
- Italy
| | - Massimo Gazzano
- Istituto per la Sintesi Organica e Fotoreattività (ISOF)
- Consiglio Nazionale delle Ricerche
- 40129 Bologna
- Italy
| | - Manuela Melucci
- Istituto per la Sintesi Organica e Fotoreattività (ISOF)
- Consiglio Nazionale delle Ricerche
- 40129 Bologna
- Italy
| | - Derek Jones
- Istituto per la Sintesi Organica e Fotoreattività (ISOF)
- Consiglio Nazionale delle Ricerche
- 40129 Bologna
- Italy
| | - Massimiliano Cavallini
- Istituto per lo Studio dei Materiali Nanostrutturati (ISMN)
- Consiglio Nazionale delle Ricerche (CNR)
- 40129 Bologna
- Italy
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10
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11
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Ma H, Jiang Z, Xie X, Huang L, Huang W. Multiplexed Biomolecular Arrays Generated via Parallel Dip-Pen Nanolithography. ACS APPLIED MATERIALS & INTERFACES 2018; 10:25121-25126. [PMID: 29986136 DOI: 10.1021/acsami.8b07369] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The capability of transferring target materials especially functionality-reliable biomolecules, into specific locations and with arbitrarily designed patterns are of critical importance for high-throughput disease diagnosis, multiplexing, and drug screening. Herein, we report the simultaneous patterning of two types of biomolecules using the parallel dip-pen nanolithography technology where an array of the atomic force microscope (AFM) tips can be selectively and alternately coated with target biomolecules via a specially designed inkwell array. Moreover, mixing target biomolecules at a proper volumetric ratio with polyethylene glycol dissolved in PBS buffer solution that works as an ink carrier can not only facilitate the smooth transfer of ink materials from the AFM tip to the substrate, it can also help to adjust the ink diffusion constant of different biomolecules to be highly similar so that the multiplexed biofunctional dot and/or line arrays at similar sizes can be reliably generated.
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Affiliation(s)
- Hui Ma
- Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University , 30 South Puzhu Road , Nanjing 211816 , China
| | - Zhang Jiang
- Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University , 30 South Puzhu Road , Nanjing 211816 , China
| | - Xiaoji Xie
- Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University , 30 South Puzhu Road , Nanjing 211816 , China
| | - Ling Huang
- Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University , 30 South Puzhu Road , Nanjing 211816 , China
| | - Wei Huang
- Institute of Advanced Materials (IAM), Jiangsu National Synergistic Innovation Center for Advanced Materials (SICAM) , Nanjing Tech University , 30 South Puzhu Road , Nanjing 211816 , China
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12
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Jana NC, Brandão P, Mathonière C, Panja A. Synthesis, structure and magnetic properties of dinuclear cobalt-tetraoxolene complexes with bidentate terminal ligands. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.12.038] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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13
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Borgatti F, Torelli P, Brucale M, Gentili D, Panaccione G, Castan Guerrero C, Schäfer B, Ruben M, Cavallini M. Opposite Surface and Bulk Solvatochromic Effects in a Molecular Spin-Crossover Compound Revealed by Ambient Pressure X-ray Absorption Spectroscopy. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:3604-3609. [PMID: 29510051 DOI: 10.1021/acs.langmuir.8b00028] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We investigate the solvatochromic effect of a Fe-based spin-crossover (SCO) compound via ambient pressure soft X-ray absorption spectroscopy (AP-XAS) and atomic force microscopy (AFM). AP-XAS provides the direct evidence of the spin configuration for the Fe(II) 3d states of the SCO material upon in situ exposure to specific gas or vapor mixtures; concurrent changes in nanoscale topography and mechanical characteristics are revealed via AFM imaging and AFM-based force spectroscopy, respectively. We find that exposing the SCO material to gaseous helium promotes an effective decrease of the transition temperature of its surface layers, while the exposure to methanol vapor causes opposite surfacial and bulk solvatochromic effects. Surfacial solvatochromism is accompanied by a dramatic reduction of the surface layers stiffness. We propose a rationalization of the observed effects based on interfacial dehydration and solvation phenomena.
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Affiliation(s)
- Francesco Borgatti
- Consiglio Nazionale delle Ricerche , Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) , Via P. Gobetti 101 , Bologna 40129 , Italy
| | - Piero Torelli
- CNR-IOM , Tasc Laboratory , S.S. 14 Km 163.5 in Area Science Park , Basovizza , Trieste 34149 , Italy
| | - Marco Brucale
- Consiglio Nazionale delle Ricerche , Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) , Via P. Gobetti 101 , Bologna 40129 , Italy
| | - Denis Gentili
- Consiglio Nazionale delle Ricerche , Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) , Via P. Gobetti 101 , Bologna 40129 , Italy
| | - Giancarlo Panaccione
- CNR-IOM , Tasc Laboratory , S.S. 14 Km 163.5 in Area Science Park , Basovizza , Trieste 34149 , Italy
| | - Celia Castan Guerrero
- CNR-IOM , Tasc Laboratory , S.S. 14 Km 163.5 in Area Science Park , Basovizza , Trieste 34149 , Italy
| | - Bernhard Schäfer
- Institute of Nanotechnology , Karlsruhe Institute of Technology , Eggenstein-Leopoldshafen D-76344 , Germany
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) , CNRS-Université de Strasbourg , 23, rue du Loess, BP 43 , Strasbourg Cedex 2 67034 , France
| | - Mario Ruben
- Institute of Nanotechnology , Karlsruhe Institute of Technology , Eggenstein-Leopoldshafen D-76344 , Germany
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) , CNRS-Université de Strasbourg , 23, rue du Loess, BP 43 , Strasbourg Cedex 2 67034 , France
| | - Massimiliano Cavallini
- Consiglio Nazionale delle Ricerche , Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) , Via P. Gobetti 101 , Bologna 40129 , Italy
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14
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Jana NC, Brandão P, Saha A, Panja A. Synthesis, crystal structure and electronic property of a tetraoxolene bridged dinuclear cobalt(II) complex with bipyridyl blocking ligand. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.09.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Bergenti I, Ruani G, Liscio F, Milita S, Dinelli F, Xu X, Wang E, Cavallini M. Highly Ordered Organic Ferroelectric DIPAB-Patterned Thin Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:12859-12864. [PMID: 29028341 DOI: 10.1021/acs.langmuir.7b02102] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Ferroelectric molecular compounds present great advantages for application in electronics because they combine high polarization values, comparable to those of inorganic materials, with the flexibility and low-cost properties of organic ones. However, some limitations to their applicability are related to the high crystallinity required to deploy ferroelectricity. In this article, highly ordered ferroelectric patterned thin films of diisopropylammonium bromide have been successfully fabricated by a lithographically controlled wetting technique. Confinement favors the self-organization of ferroelectric crystals, avoiding the formation of polymorphs and promoting the long-range orientation of crystallographic axes. Patterned structures present high stability, and the polarization can be switched to be arranged in stable domain pattern for application in devices.
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Affiliation(s)
| | | | | | | | | | - Xiaofeng Xu
- Chalmers University of Technology , SE-412 96 Gothenburg, Sweden
| | - Ergang Wang
- Chalmers University of Technology , SE-412 96 Gothenburg, Sweden
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Controlled self-organization of polymer nanopatterns over large areas. Sci Rep 2017; 7:10526. [PMID: 28874796 PMCID: PMC5585330 DOI: 10.1038/s41598-017-09463-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Accepted: 07/26/2017] [Indexed: 12/14/2022] Open
Abstract
Self-assembly methods allow to obtain ordered patterns on surfaces with exquisite precision, but often lack in effectiveness over large areas. Here we report on the realization of hierarchically ordered polymethylmethacrylate (PMMA) nanofibres and nanodots over large areas from solution via a fast, easy and low-cost method named ASB-SANS, based on a ternary solution that is cast on the substrate. Simple changes to the ternary solution composition allow to control the transition from nanofibres to nanodots, via a wide range of intermediate topologies. The ternary solution includes the material to be patterned, a liquid solvent and a solid substance able to sublimate. The analysis of the fibres/dots width and inter-pattern distance variations with respect to the ratio between the solution components suggests that the macromolecular chains mobility in the solidified sublimating substance follows Zimm-like models (mobility of macromolecules in diluted liquid solutions). A qualitative explanation of the self-assembly phenomena originating the observed nanopatterns is given. Finally, ASB-SANS-generated PMMA nanodots arrays have been used as lithographic masks for a silicon substrate and submitted to Inductively Coupled Plasma-Reactive Ion Etching (ICP-RIE). As a result, nanopillars with remarkably high aspect ratios have been achieved over areas as large as several millimeters square, highlighting an interesting potential of ASB-SANS in practical applications like photon trapping in photovoltaic cells, surface-enhanced sensors, plasmonics.
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Pathak A, Bora A, Braunschweig B, Meltzer C, Yan H, Lemmens P, Daum W, Schwartz J, Tornow M. Nanocylindrical confinement imparts highest structural order in molecular self-assembly of organophosphonates on aluminum oxide. NANOSCALE 2017; 9:6291-6295. [PMID: 28485443 DOI: 10.1039/c7nr02420g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
We report the impact of geometrical constraint on intramolecular interactions in self-assembled monolayers (SAMs) of alkylphosphonates grown on anodically oxidized aluminum (AAO). Molecular order in these films was determined by sum frequency generation (SFG) spectroscopy, a more sensitive measure of order than infrared absorption spectroscopy. Using SFG we show that films grown on AAO are, within detection limits, nearly perfectly ordered in an all-trans alkyl chain configuration. In marked contrast, films formed on planar, plasma-oxidized aluminum oxide or α-Al2O3 (0001) are replete with gauche defects. We attribute these differences to the nanocylindrical structure of AAO, which enforces molecular confinement.
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Affiliation(s)
- Anshuma Pathak
- Institut für Halbleitertechnik, TU Braunschweig, Germany
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18
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Japaridze A, Orlandini E, Smith KB, Gmür L, Valle F, Micheletti C, Dietler G. Spatial confinement induces hairpins in nicked circular DNA. Nucleic Acids Res 2017; 45:4905-4914. [PMID: 28201616 PMCID: PMC5605231 DOI: 10.1093/nar/gkx098] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 01/25/2017] [Accepted: 02/06/2017] [Indexed: 01/05/2023] Open
Abstract
In living cells, DNA is highly confined in space with the help of condensing agents, DNA binding proteins and high levels of supercoiling. Due to challenges associated with experimentally studying DNA under confinement, little is known about the impact of spatial confinement on the local structure of the DNA. Here, we have used well characterized slits of different sizes to collect high resolution atomic force microscopy images of confined circular DNA with the aim of assessing the impact of the spatial confinement on global and local conformational properties of DNA. Our findings, supported by numerical simulations, indicate that confinement imposes a large mechanical stress on the DNA as evidenced by a pronounced anisotropy and tangent-tangent correlation function with respect to non-constrained DNA. For the strongest confinement we observed nanometer sized hairpins and interwound structures associated with the nicked sites in the DNA sequence. Based on these findings, we propose that spatial DNA confinement in vivo can promote the formation of localized defects at mechanically weak sites that could be co-opted for biological regulatory functions.
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Affiliation(s)
| | - Enzo Orlandini
- Dipartimento di Fisica e Astronomia and Sezione INFN, Universita di Padova, Via Marzolo 8, 35131 Padova, Italy
| | | | - Lucas Gmür
- Laboratory of Physics of Living Matter, EPFL, 1015 Lausanne, Switzerland
| | - Francesco Valle
- Consiglio Nazionale delle Ricerche (CNR), Istituto per lo Studio dei Materiali Nanostrutturati (ISMN), Via P.Gobetti 101, Bologna 40129, Italy
| | - Cristian Micheletti
- SISSA - Scuola Internazionale Superiore di Studi Avanzati and CNR-IOM Democritos, Via Bonomea 265, 34136 Trieste, Italy
| | - Giovanni Dietler
- Laboratory of Physics of Living Matter, EPFL, 1015 Lausanne, Switzerland
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Castriciano MA, Gentili D, Romeo A, Cavallini M, Scolaro LM. Spatial control of chirality in supramolecular aggregates. Sci Rep 2017; 7:44094. [PMID: 28275239 PMCID: PMC5343480 DOI: 10.1038/srep44094] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 01/26/2017] [Indexed: 01/14/2023] Open
Abstract
Chirality is one of the most intriguing properties of matter related to a molecule’s lack of mirror symmetry. The transmission of chirality from the molecular level up to the macroscopic scale has major implications in life sciences but it is also relevant for many chemical applications ranging from catalysis to spintronic. These technological applications require an accurate control of morphology, homogeneity and chiral handedness of thin films and nanostructures. We demonstrate a simple approach to specifically transfer chirality to the model supramolecular system of J aggregates of the protonated form of tetrakis(4-sulfonatophenyl)-porphyrin by utilizing a soft lithography technique. This approach successfully allows the fabrication of an ordered distribution of sub-micrometric structures in precise and controllable positions with programmed chirality, providing a fundamental breakthrough toward the exploitation of chiral supramolecular aggregates in technological applications, such as sensors, non-linear optics and spintronic.
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Affiliation(s)
- Maria A Castriciano
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati, Italy
| | - Denis Gentili
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati, Italy
| | - Andrea Romeo
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati, Italy.,Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, University of Messina, and C.I.R.C.M.S.B., V.le F. Stagno D'Alcontres 31, Vill. S. Agata, 98166 Messina, Italy
| | - Massimiliano Cavallini
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati, Italy
| | - Luigi Monsù Scolaro
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati, Italy.,Dipartimento di Scienze Chimiche, Biologiche, Farmaceutiche ed Ambientali, University of Messina, and C.I.R.C.M.S.B., V.le F. Stagno D'Alcontres 31, Vill. S. Agata, 98166 Messina, Italy
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20
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Halevi O, Jiang H, Kloc C, Magdassi S. Additive manufacturing of micrometric crystallization vessels and single crystals. Sci Rep 2016; 6:36786. [PMID: 27830827 PMCID: PMC5103199 DOI: 10.1038/srep36786] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 10/17/2016] [Indexed: 11/17/2022] Open
Abstract
We present an all-additive manufacturing method that is performed at mild conditions, for the formation of organic single crystals at specific locations, without any photolithography prefabrication process. The method is composed of two steps; inkjet printing of a confinement frame, composed of a water soluble electrolyte. Then, an organic semiconductor solution is printed within the confinement to form a nucleus at a specific location, followed by additional printing, which led to the growth of a single crystal. The specific geometry of the confinement enables control of the specific locations of the single crystals, while separating the nucleation and crystal growth processes. By this method, we printed single crystals of perylene, which are suitable for the formation of OFETs. Moreover, since this method is based on a simple and controllable wet deposition process, it enables formation of arrays of single crystals at specific locations, which is a prerequisite for mass production of active organic elements on flexible substrates.
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Affiliation(s)
- Oded Halevi
- Casali Center of Applied Chemistry, Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
- School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore
| | - Hui Jiang
- School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore
| | - Christian Kloc
- School of Materials Science and Engineering, Nanyang Technological University, 639798, Singapore
| | - Shlomo Magdassi
- Casali Center of Applied Chemistry, Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem 91904, Israel
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21
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Matienko L, Mosolova L, Binyukov V, Zaikov G. Catalytic Activity of Binary and Triple Systems Based on Redox Inactive Metal Compound, LiSt and Additives of Monodentate Ligands-Modifiers: DMF, HMPA and PhOH, in Selective Ethylbenzene Oxidation with Dioxygen. CHEMISTRY & CHEMICAL TECHNOLOGY 2016. [DOI: 10.23939/chcht10.03.259] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Mechanism of catalysis with binary and triple catalytic systems based on redox inactive metal (lithium) compound {LiSt+L2} and {LiSt+L2+PhOH} (L2=DMF or HMPA), in the selective ethylbenzene oxidation by dioxygen into -phenylethyl hydroperoxide is researched. The results are compared with catalysis by nickel-lithium triple system {NiII(acac)2+LiSt+PhOH} in selective ethylbenzene oxidation to PEH. The role of H-bonding in mechanism of catalysis is discussed. The possibility of the stable supramolecular nanostructures formation on the basis of triple systems, {LiSt+L2+PhOH}, due to intermolecular H-bonds, is researched with the AFM method.
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22
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Ariga K, Malgras V, Ji Q, Zakaria MB, Yamauchi Y. Coordination nanoarchitectonics at interfaces between supramolecular and materials chemistry. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.01.015] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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23
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Mohanraj J, Puzzi L, Capria E, Corvaglia S, Casalis L, Mestroni L, Sbaizero O, Fraleoni-Morgera A. Easy fabrication of aligned PLLA nanofibers-based 2D scaffolds suitable for cell contact guidance studies. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2016; 62:301-6. [DOI: 10.1016/j.msec.2015.12.042] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 11/03/2015] [Accepted: 12/18/2015] [Indexed: 10/22/2022]
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24
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Manrique-Juárez MD, Rat S, Salmon L, Molnár G, Quintero CM, Nicu L, Shepherd HJ, Bousseksou A. Switchable molecule-based materials for micro- and nanoscale actuating applications: Achievements and prospects. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2015.04.005] [Citation(s) in RCA: 169] [Impact Index Per Article: 21.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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25
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Gentili D, Liscio F, Demitri N, Schäfer B, Borgatti F, Torelli P, Gobaut B, Panaccione G, Rossi G, Degli Esposti A, Gazzano M, Milita S, Bergenti I, Ruani G, Šalitroš I, Ruben M, Cavallini M. Surface induces different crystal structures in a room temperature switchable spin crossover compound. Dalton Trans 2016; 45:134-43. [PMID: 26575005 DOI: 10.1039/c5dt03712c] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
We investigated the influence of surfaces in the formation of different crystal structures of a spin crossover compound, namely [Fe(L)2] (LH: (2-(pyrazol-1-yl)-6-(1H-tetrazol-5-yl)pyridine), which is a neutral compound thermally switchable around room temperature. We observed that the surface induces the formation of two different crystal structures, which exhibit opposite spin transitions, i.e. on heating them up to the transition temperature, one polymorph switches from high spin to low spin and the second polymorph switches irreversibly from low spin to high spin. We attributed this inversion to the presence of water molecules H-bonded to the complex tetrazolyl moieties in the crystals. Thin deposits were investigated by means of polarized optical microscopy, atomic force microscopy, X-ray diffraction, X-ray absorption spectroscopy and micro Raman spectroscopy; moreover the analysis of the Raman spectra and the interpretation of spin inversion were supported by DFT calculations.
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Affiliation(s)
- Denis Gentili
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) Via P. Gobetti 101, 40129 Bologna, Italy.
| | - Fabiola Liscio
- Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi, (CNR-IMM) Via P. Gobetti 101, 40129 Bologna, Italy
| | - Nicola Demitri
- Elettra - Sincrotrone Trieste, S.S. 14 Km 163.5 in Area Science Park, 34149 Basovizza - Trieste, Italy
| | - Bernhard Schäfer
- Institute of Nanotechnology, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Denmark
| | - Francesco Borgatti
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) Via P. Gobetti 101, 40129 Bologna, Italy.
| | - Piero Torelli
- Consiglio Nazionale delle Ricerche, Istituto Officina dei Materiali (CNR-IOM), Laboratorio TASC, Area Science Park, I-34149 Trieste, Italy
| | - Benoit Gobaut
- Elettra - Sincrotrone Trieste, S.S. 14 Km 163.5 in Area Science Park, 34149 Basovizza - Trieste, Italy
| | - Giancarlo Panaccione
- Consiglio Nazionale delle Ricerche, Istituto Officina dei Materiali (CNR-IOM), Laboratorio TASC, Area Science Park, I-34149 Trieste, Italy
| | - Giorgio Rossi
- Consiglio Nazionale delle Ricerche, Istituto Officina dei Materiali (CNR-IOM), Laboratorio TASC, Area Science Park, I-34149 Trieste, Italy and Universita` di Milano, Dipartimento di Fisica, via Celoria 16, 20133 Milano, Italy
| | - Alessandra Degli Esposti
- Consiglio Nazionale delle Ricerche, Istituto per la Sintesi Organica e la Fotoreattività (CNR-ISOF) Via P. Gobetti 101, 40129 Bologna, Italy
| | - Massimo Gazzano
- Consiglio Nazionale delle Ricerche, Istituto per la Sintesi Organica e la Fotoreattività (CNR-ISOF) Via P. Gobetti 101, 40129 Bologna, Italy
| | - Silvia Milita
- Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi, (CNR-IMM) Via P. Gobetti 101, 40129 Bologna, Italy
| | - Ilaria Bergenti
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) Via P. Gobetti 101, 40129 Bologna, Italy.
| | - Giampiero Ruani
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) Via P. Gobetti 101, 40129 Bologna, Italy.
| | - Ivan Šalitroš
- Institute of Inorganic Chemistry, Technology and Materials, Faculty of Chemical and Food Technology, Slovak University of Technology, Bratislava, 81237, Slovakia
| | - Mario Ruben
- Institute of Nanotechnology, Karlsruhe Institute of Technology, D-76344 Eggenstein-Leopoldshafen, Denmark and Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS), CNRS-Université de Strasbourg, 23, rue du Loess, BP 43, 67034, Strasbourg Cedex 2, France
| | - Massimiliano Cavallini
- Consiglio Nazionale delle Ricerche, Istituto per lo Studio dei Materiali Nanostrutturati (CNR-ISMN) Via P. Gobetti 101, 40129 Bologna, Italy.
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26
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Lee SH, Lee SJ, Jazbinsek M, Kang BJ, Rotermund F, Kwon OP. Electro-optic crystals grown in confined geometry with optimal crystal characteristics for THz photonic applications. CrystEngComm 2016. [DOI: 10.1039/c6ce00958a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Singh RS, Mukhopadhyay S, Biswas A, Pandey DS. Exquisite 1D Assemblies Arising from Rationally Designed Asymmetric Donor-Acceptor Architectures Exhibiting Aggregation-Induced Emission as a Function of Auxiliary Acceptor Strength. Chemistry 2015; 22:753-63. [DOI: 10.1002/chem.201503570] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Indexed: 11/05/2022]
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28
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Sachan P, Kulkarni M, Sharma A. Hierarchical Micro/Nano Structures by Combined Self-Organized Dewetting and Photopatterning of Photoresist Thin Films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:12505-12511. [PMID: 26488849 DOI: 10.1021/acs.langmuir.5b02977] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Photoresists are the materials of choice for micro/nanopatterning and device fabrication but are rarely used as a self-assembly material. We report for the first time a novel interplay of self-assembly and photolithography for fabrication of hierarchical and ordered micro/nano structures. We create self-organized structures by the intensified dewetting of unstable thin (∼10 nm to 1 μm) photoresist films by annealing them in an optimal solvent and nonsolvent liquid mixture that allows spontaneous dewetting to form micro/nano smooth dome-like structures. The density, size (∼100 nm to millimeters), and curvature/contact angle of the dome/droplet structures are controlled by the film thickness, composition of the dewetting liquid, and time of annealing. Ordered dewetted structures are obtained simply by creating spatial variation of viscosity by ultraviolet exposure or by photopatterning before dewetting. Further, the structures thus fabricated are readily photopatterned again on the finer length scales after dewetting. We illustrate the approach by fabricating several three-dimensional structures of varying complexity with secondary and tertiary features.
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Affiliation(s)
- Priyanka Sachan
- Department of Chemical Engineering & Center for Nanosciences, Indian Institute of Technology Kanpur , Kanpur, India 208016
| | - Manish Kulkarni
- Department of Chemical Engineering & Center for Nanosciences, Indian Institute of Technology Kanpur , Kanpur, India 208016
| | - Ashutosh Sharma
- Department of Chemical Engineering & Center for Nanosciences, Indian Institute of Technology Kanpur , Kanpur, India 208016
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29
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Thomas D, Gaspar D, Sorushanova A, Milcovich G, Spanoudes K, Mullen AM, O'Brien T, Pandit A, Zeugolis DI. Scaffold and scaffold-free self-assembled systems in regenerative medicine. Biotechnol Bioeng 2015; 113:1155-63. [PMID: 26498484 DOI: 10.1002/bit.25869] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 10/19/2015] [Accepted: 10/23/2015] [Indexed: 01/09/2023]
Abstract
Self-assembly in tissue engineering refers to the spontaneous chemical or biological association of components to form a distinct functional construct, reminiscent of native tissue. Such self-assembled systems have been widely used to develop platforms for the delivery of therapeutic and/or bioactive molecules and various cell populations. Tissue morphology and functional characteristics have been recapitulated in several self-assembled constructs, designed to incorporate stimuli responsiveness and controlled architecture through spatial confinement or field manipulation. In parallel, owing to substantial functional properties, scaffold-free cell-assembled devices have aided in the development of functional neotissues for various clinical targets. Herein, we discuss recent advancements and future aspirations in scaffold and scaffold-free self-assembled devices for regenerative medicine purposes. Biotechnol. Bioeng. 2016;113: 1155-1163. © 2015 Wiley Periodicals, Inc.
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Affiliation(s)
- Dilip Thomas
- Centre for Research in Medical Devices (CÚRAM), Biosciences Research Building, National University of Ireland Galway (NUI Galway), Galway, Ireland.,Regenerative Medicine Institute (REMEDI), Biosciences Research Building, National University of Ireland Galway (NUI Galway), Galway, Ireland
| | - Diana Gaspar
- Centre for Research in Medical Devices (CÚRAM), Biosciences Research Building, National University of Ireland Galway (NUI Galway), Galway, Ireland.,Regenerative, Modular & Developmental Engineering Laboratory (REMODEL), Biosciences Research Building, National University of Ireland Galway (NUI Galway), Galway, Ireland
| | - Anna Sorushanova
- Centre for Research in Medical Devices (CÚRAM), Biosciences Research Building, National University of Ireland Galway (NUI Galway), Galway, Ireland.,Regenerative, Modular & Developmental Engineering Laboratory (REMODEL), Biosciences Research Building, National University of Ireland Galway (NUI Galway), Galway, Ireland
| | - Gesmi Milcovich
- Centre for Research in Medical Devices (CÚRAM), Biosciences Research Building, National University of Ireland Galway (NUI Galway), Galway, Ireland
| | - Kyriakos Spanoudes
- Centre for Research in Medical Devices (CÚRAM), Biosciences Research Building, National University of Ireland Galway (NUI Galway), Galway, Ireland.,Regenerative, Modular & Developmental Engineering Laboratory (REMODEL), Biosciences Research Building, National University of Ireland Galway (NUI Galway), Galway, Ireland
| | | | - Timothy O'Brien
- Centre for Research in Medical Devices (CÚRAM), Biosciences Research Building, National University of Ireland Galway (NUI Galway), Galway, Ireland.,Regenerative Medicine Institute (REMEDI), Biosciences Research Building, National University of Ireland Galway (NUI Galway), Galway, Ireland
| | - Abhay Pandit
- Centre for Research in Medical Devices (CÚRAM), Biosciences Research Building, National University of Ireland Galway (NUI Galway), Galway, Ireland
| | - Dimitrios I Zeugolis
- Centre for Research in Medical Devices (CÚRAM), Biosciences Research Building, National University of Ireland Galway (NUI Galway), Galway, Ireland. .,Regenerative, Modular & Developmental Engineering Laboratory (REMODEL), Biosciences Research Building, National University of Ireland Galway (NUI Galway), Galway, Ireland.
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30
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Całus S, Kityk AV, Borowik L, Lefort R, Morineau D, Krause C, Schönhals A, Busch M, Huber P. High-resolution dielectric study reveals pore-size-dependent orientational order of a discotic liquid crystal confined in tubular nanopores. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2015; 92:012503. [PMID: 26274191 DOI: 10.1103/physreve.92.012503] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2015] [Indexed: 05/16/2023]
Abstract
We report a high-resolution dielectric study on a pyrene-based discotic liquid crystal (DLC) in the bulk state and confined in parallel tubular nanopores of monolithic silica and alumina membranes. The positive dielectric anisotropy of the DLC molecule at low frequencies (in the quasistatic case) allows us to explore the thermotropic collective orientational order. A face-on arrangement of the molecular discs on the pore walls and a corresponding radial arrangement of the molecules is found. In contrast to the bulk, the isotropic-to-columnar transition of the confined DLC is continuous, shifts with decreasing pore diameter to lower temperatures, and exhibits a pronounced hysteresis between cooling and heating. These findings corroborate conclusions from previous neutron and x-ray-scattering experiments as well as optical birefringence measurements. Our study also indicates that the relative simple dielectric technique presented here is a quite efficient method in order to study the thermotropic orientational order of DLC-based nanocomposites.
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Affiliation(s)
- Sylwia Całus
- Faculty of Electrical Engineering, Czestochowa University of Technology, 42-200 Czestochowa, Poland
| | - Andriy V Kityk
- Faculty of Electrical Engineering, Czestochowa University of Technology, 42-200 Czestochowa, Poland
| | - Lech Borowik
- Faculty of Electrical Engineering, Czestochowa University of Technology, 42-200 Czestochowa, Poland
| | - Ronan Lefort
- Institut de Physique de Rennes, UMR 6251, Université de Rennes 1, 35042 Rennes, France
| | - Denis Morineau
- Institut de Physique de Rennes, UMR 6251, Université de Rennes 1, 35042 Rennes, France
| | - Christina Krause
- BAM Federal Institute for Materials Research and Testing, D-12203 Berlin, Germany
| | - Andreas Schönhals
- BAM Federal Institute for Materials Research and Testing, D-12203 Berlin, Germany
| | - Mark Busch
- Institute of Materials Physics and Technology, Hamburg University of Technology (TUHH), D-21073 Hamburg-Harburg, Germany
| | - Patrick Huber
- Institute of Materials Physics and Technology, Hamburg University of Technology (TUHH), D-21073 Hamburg-Harburg, Germany
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31
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González-Monje P, Novio F, Ruiz-Molina D. Covalent Grafting of Coordination Polymers on Surfaces: The Case of Hybrid Valence Tautomeric Interphases. Chemistry 2015; 21:10094-9. [DOI: 10.1002/chem.201500671] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Indexed: 11/07/2022]
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32
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Kellermann G, Montoro LA, Giovanetti LJ, dos Santos Claro PC, Zhang L, Ramirez AJ, Requejo FG, Craievich AF. Controlled growth of extended arrays of CoSi2 hexagonal nanoplatelets buried in Si(001), Si(011) and Si(111) wafers. Phys Chem Chem Phys 2015; 17:4945-51. [PMID: 25594082 DOI: 10.1039/c4cp04738a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Because of their high electrical conductivity CoSi2 nanostructures are potential candidates for preparing ordered nano-arrays to be used as electrode interconnectors and contacts in microelectronic devices. We here describe a controlled procedure for the endotaxial growth of hexagonal CoSi2 nanoplatelets buried in differently oriented single crystalline Si wafers on which a Co-doped SiO2 thin film was previously deposited. These nanomaterials were obtained by a clean procedure consisting of isothermal annealing at 750 °C under a He atmosphere of Co-doped SiO2 thin films deposited onto the surface of three differently oriented flat Si substrates, namely Si(001), Si(011) and Si(111). Buried CoSi2 nanoplatelets are in all cases spontaneously formed as a consequence of the diffusion of Co atoms into the silicon wafer and their reaction with host Si atoms. Our TEM and GISAXS analyses demonstrated that these arrays, irrespective of host Si orientation, consist of CoSi2 hexagonal nanoplatelets in all cases parallel to Si{111} crystallographic planes. Additionally, the dimensions of the nanoplatelets were consistently determined by TEM and GISAXS for the three different host Si single crystal orientations.
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Affiliation(s)
- G Kellermann
- Departamento de Física, Universidade Federal do Paraná, Caixa Postal 19091, Curitiba, Paraná 81531-990, Brazil
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33
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Fernández-Regúlez M, Evangelio L, Lorenzoni M, Fraxedas J, Pérez-Murano F. Sub-10 nm resistless nanolithography for directed self-assembly of block copolymers. ACS APPLIED MATERIALS & INTERFACES 2014; 6:21596-21602. [PMID: 25360636 DOI: 10.1021/am506600m] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The creation of highly efficient guiding patterns for the directed self-assembly of block copolymers by resistless nanolithography using atomic force microscopy (AFM) is demonstrated. It is shown that chemical patterns consisting of arrays of lines defined on a brush layer by AFM allow the alignment of the blocks of lamella-forming polymers. The main advantage of this method relies on the capability to create high-resolution (sub-10 nm line-width) guiding patterns and the reduction of the number of process steps compared to the state-of-the-art methods for creating guiding patterns by chemical surface modification. It is found that the guiding patterns induce the block alignment very efficiently, allowing the achievement of a density multiplication factor of 7 for block copolymers of 14 nm half-pitch, which is attributed to the combined effect of topographical and chemical modification.
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Affiliation(s)
- Marta Fernández-Regúlez
- Instituto de Microelectrónica de Barcelona (IMB-CNM, CSIC) , Campus UAB, 08193 Bellaterra, Barcelona, Spain
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