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Xue Z, Li X, Chen X, Huang C, Ye H, Li A, Wang T. Mechanical and Tribological Performances Enhanced by Self-Assembled Structures. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2002004. [PMID: 32754977 DOI: 10.1002/adma.202002004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 07/03/2020] [Indexed: 06/11/2023]
Abstract
Taking inspiration from natural materials, composite materials can be reinforced by creating matrix architectures that can better accommodate and control internal stresses. Despite the recent success in the synthesis of artificial assemblies for local reinforcement through the introduction of oriented fibers and plates into host multilayered composites, there is a lack of fundamental understanding of the factors that determine mechanical properties. Moreover, designing building blocks and interfaces that facilitate higher resistance and energy dissipation is highly challenging. When the intrinsic material is fixed, the mechanical and tribological properties can be further adjusted. In this study, europium oxide nanosheets are arranged in interlocked-junction superstructures that resist sliding at junction points, thereby enhancing the mechanical properties of the nanosheet assemblies compared to those of the conventional face-to-face superstructures formed by parallel nanosheets. Furthermore, the crystalline origin of building blocks is revealed by demonstrating that faulty crystal nanosheets adopting an amorphous structure are different from single-crystal nanosheets, with the former exhibiting superior mechanical reinforcement and improved abrasive resistance.
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Affiliation(s)
- Zhenjie Xue
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Xiao Li
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Xiangyu Chen
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Chuanhui Huang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Haochen Ye
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
| | - Ailin Li
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
| | - Tie Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China
- School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, P. R. China
- Life and Health Research Institute, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin, 300384, P. R. China
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2
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Wang Y, Santos PJ, Kubiak JM, Guo X, Lee MS, Macfarlane RJ. Multistimuli Responsive Nanocomposite Tectons for Pathway Dependent Self-Assembly and Acceleration of Covalent Bond Formation. J Am Chem Soc 2019; 141:13234-13243. [PMID: 31357862 PMCID: PMC6727667 DOI: 10.1021/jacs.9b06695] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2019] [Indexed: 12/22/2022]
Abstract
Nanocomposite tectons (NCTs) are a recently developed building block for polymer-nanoparticle composite synthesis, consisting of nanoparticle cores functionalized with dense monolayers of polymer chains that terminate in supramolecular recognition groups capable of linking NCTs into hierarchical structures. In principle, the use of molecular binding to guide particle assembly allows NCTs to be highly modular in design, with independent control over the composition of the particle core and polymer brush. However, a major challenge to realize an array of compositionally and structurally varied NCT-based materials is the development of different supramolecular bonding interactions to control NCT assembly, as well as an understanding of how the organization of multiple supramolecular groups around a nanoparticle scaffold affects their collective binding interactions. Here, we present a suite of rationally designed NCT systems, where multiple types of supramolecular interactions (hydrogen bonding, metal complexation, and dynamic covalent bond formation) are used to tune NCT assembly as a function of multiple external stimuli including temperature, small molecules, pH, and light. Furthermore, the incorporation of multiple orthogonal supramolecular chemistries in a single NCT system makes it possible to dictate the morphologies of the assembled NCTs in a pathway-dependent fashion. Finally, multistimuli responsive NCTs enable the modification of composite properties by postassembly functionalization, where NCTs linked by covalent bonds with significantly enhanced stability are obtained in a fast and efficient manner. The designs presented here therefore provide major advancement for the field of composite synthesis by establishing a framework for synthesizing hierarchically ordered composites capable of complicated assembly behaviors.
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Affiliation(s)
- Yuping Wang
- Department of Materials Science and
Engineering, Massachusetts Institute of
Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Peter J. Santos
- Department of Materials Science and
Engineering, Massachusetts Institute of
Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Joshua M. Kubiak
- Department of Materials Science and
Engineering, Massachusetts Institute of
Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Xinheng Guo
- Department of Materials Science and
Engineering, Massachusetts Institute of
Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Margaret S. Lee
- Department of Materials Science and
Engineering, Massachusetts Institute of
Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
| | - Robert J. Macfarlane
- Department of Materials Science and
Engineering, Massachusetts Institute of
Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, United States
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Kang S, Nam D, Choi J, Ko J, Kim D, Kwon CH, Huh J, Cho J. Highly Conductive Paper/Textile Electrodes Using Ligand Exchange Reaction-Induced in Situ Metallic Fusion. ACS APPLIED MATERIALS & INTERFACES 2019; 11:12032-12042. [PMID: 30883078 DOI: 10.1021/acsami.8b21445] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Here, we report that metal nanoparticle (NP)-based paper/textile electrodes with bulk metallic conductivity can be prepared via organic linker-modulated ligand exchange reaction and in situ room-temperature metallic fusion without additional chemical or thermal treatments. For this study, amine-functionalized molecule linkers instead of bulky polymer linkers were layer-by-layer (LbL)-assembled with tetraoctylammonium bromide (TOABr)-stabilized Au NPs to form Au NP multilayered films. By conversion of the amine groups of the organic molecule linkers from -NH3+ to the -NH2 groups, as well as by a decrease in the size of the organic linkers, the LbL-assembled Au NPs became highly interconnected and fused during LbL deposition, resulting in Au NP multilayers with adjustable conductivity and transport behavior. These phenomena were also predicted by a density functional theory investigation for the model system. Particularly, LbL-assembled films composed of TOABr-Au NPs and diethylenetriamine ( Mw: ∼104) exhibited a remarkable electrical conductivity of 2.2 × 105 S·cm-1, which was higher than the electrical conductivity of the metal NP-based electrodes as well as the carbon material-based electrodes reported to date. Furthermore, based on our approach, a variety of insulating flexible papers and textiles were successfully converted into real metal-like paper and textile electrodes with high flexibility preserving their highly porous structure. This approach can provide a basis for further improving and controlling the electrical properties of flexible electrodes through the control of organic linkers.
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Affiliation(s)
- Sungkun Kang
- Department of Chemical and Biological Engineering , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
| | - Donghyeon Nam
- Department of Chemical and Biological Engineering , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
| | - Jimin Choi
- Department of Chemical and Biological Engineering , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
| | - Jongkuk Ko
- Department of Chemical and Biological Engineering , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
| | - Donghee Kim
- Department of Chemical and Biological Engineering , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
| | - Cheong Hoon Kwon
- Department of Chemical and Biological Engineering , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
| | - June Huh
- Department of Chemical and Biological Engineering , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
| | - Jinhan Cho
- Department of Chemical and Biological Engineering , Korea University , 145 Anam-ro , Seongbuk-gu, Seoul 02841 , Republic of Korea
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Wang Y, Lv Z, Liao Q, Shan H, Chen J, Zhou Y, Zhou L, Chen X, Roy VAL, Wang Z, Xu Z, Zeng YJ, Han ST. Synergies of Electrochemical Metallization and Valance Change in All-Inorganic Perovskite Quantum Dots for Resistive Switching. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1800327. [PMID: 29782667 DOI: 10.1002/adma.201800327] [Citation(s) in RCA: 105] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2018] [Revised: 03/22/2018] [Indexed: 06/08/2023]
Abstract
The in-depth understanding of ions' generation and movement inside all-inorganic perovskite quantum dots (CsPbBr3 QDs), which may lead to a paradigm to break through the conventional von Neumann bottleneck, is strictly limited. Here, it is shown that formation and annihilation of metal conductive filaments and Br- ion vacancy filaments driven by an external electric field and light irradiation can lead to pronounced resistive-switching effects. Verified by field-emission scanning electron microscopy as well as energy-dispersive X-ray spectroscopy analysis, the resistive switching behavior of CsPbBr3 QD-based photonic resistive random-access memory (RRAM) is initiated by the electrochemical metallization and valance change. By coupling CsPbBr3 QD-based RRAM with a p-channel transistor, the novel application of an RRAM-gate field-effect transistor presenting analogous functions of flash memory is further demonstrated. These results may accelerate the technological deployment of all-inorganic perovskite QD-based photonic resistive memory for successful logic application.
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Affiliation(s)
- Yan Wang
- College of Electronic Science and Technology, Shenzhen University, Shenzhen, 518060, P. R. China
- Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Ziyu Lv
- College of Electronic Science and Technology, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Qiufan Liao
- Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Haiquan Shan
- Department of Chemistry, South University of Science and Technology of China, No 1088, Xueyuan Road, Xili, Nanshan District, Shenzhen, Guangdong, 518055, P. R. China
| | - Jinrui Chen
- Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Ye Zhou
- Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Li Zhou
- College of Electronic Science and Technology, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Xiaoli Chen
- College of Electronic Science and Technology, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Vellaisamy A L Roy
- Department of Materials Science and Engineering, City University of Hong Kong, Hong Kong SAR, 999077, P. R. China
| | - Zhanpeng Wang
- Institute for Advanced Study, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Zongxiang Xu
- Department of Chemistry, South University of Science and Technology of China, No 1088, Xueyuan Road, Xili, Nanshan District, Shenzhen, Guangdong, 518055, P. R. China
| | - Yu-Jia Zeng
- Shenzhen Key Laboratory of Laser Engineering, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China
| | - Su-Ting Han
- College of Electronic Science and Technology, Shenzhen University, Shenzhen, 518060, P. R. China
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Pham HT, Yang JH, Lee DS, Lee BH, Jeong HD. Ferroelectric/Dielectric Double Gate Insulator Spin-Coated Using Barium Titanate Nanocrystals for an Indium Oxide Nanocrystal-Based Thin-Film Transistor. ACS APPLIED MATERIALS & INTERFACES 2016; 8:7248-7256. [PMID: 26927618 DOI: 10.1021/acsami.6b00109] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Barium titanate nanocrystals (BT NCs) were prepared under solvothermal conditions at 200 °C for 24 h. The shape of the BT NCs was tuned from nanodot to nanocube upon changing the polarity of the alcohol solvent, varying the nanosize in the range of 14-22 nm. Oleic acid-passivated NCs showed good solubility in a nonpolar solvent. The effect of size and shape of the BT NCs on the ferroelectric properties was also studied. The maximum polarization value of 7.2 μC/cm(2) was obtained for the BT-5 NC thin film. Dielectric measurements of the films showed comparable dielectric constant values of BT NCs over 1-100 kHz without significant loss. Furthermore, the bottom gate In2O3 NC thin film transistors exhibited outstanding device performance with a field-effect mobility of 11.1 cm(2) V(-1) s(-1) at a low applied gate voltage with BT-5 NC/SiO2 as the gate dielectric. The low-density trapped state was observed at the interface between the In2O3 NC semiconductor and the BT-5 NCs/SiO2 dielectric film. Furthermore, compensation of the applied gate field by an electric dipole-induced dipole field within the BT-5 NC film was also observed.
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Affiliation(s)
- Hien Thu Pham
- Department of Chemistry, Chonnam National University , Gwangju 500-757, Republic of Korea
| | - Jin Ho Yang
- School of Materials Science & Engineering, Gwangju Institute of Science & Technology , Gwangju 500-712, Republic of Korea
| | - Don-Sung Lee
- Department of Chemistry, Chonnam National University , Gwangju 500-757, Republic of Korea
| | - Byoung Hun Lee
- School of Materials Science & Engineering, Gwangju Institute of Science & Technology , Gwangju 500-712, Republic of Korea
| | - Hyun-Dam Jeong
- Department of Chemistry, Chonnam National University , Gwangju 500-757, Republic of Korea
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6
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Jin F, Zheng ML, Liu ZH, Fan YM, Xu K, Zhao ZS, Duan XM. Layer-by-layer assembled PMMA-SH/CdSe–Au nanocomposite thin films and the optical limiting property. RSC Adv 2016. [DOI: 10.1039/c6ra02893d] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We demonstrate layer-by-layer assembly of PMMA-SH/CdSe–Au nanocomposite thin films with good transparency, thermal stability and optical liming property, which provide potential uses in laser protective devices.
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Affiliation(s)
- Feng Jin
- Laboratory of Organic Nanophotonics and Laboratory of Bio-Inspired Smart Interface Science
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing
- P. R. China
| | - Mei-Ling Zheng
- Laboratory of Organic Nanophotonics and Laboratory of Bio-Inspired Smart Interface Science
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing
- P. R. China
| | - Zheng-Hui Liu
- Suzhou Institute of Nano-Tech and Nano-Bionics
- Chinese Academy of Sciences
- Dushu Lake Higher Education Town
- Suzhou
- P. R. China
| | - Yi-Ming Fan
- Suzhou Institute of Nano-Tech and Nano-Bionics
- Chinese Academy of Sciences
- Dushu Lake Higher Education Town
- Suzhou
- P. R. China
| | - Ke Xu
- Suzhou Institute of Nano-Tech and Nano-Bionics
- Chinese Academy of Sciences
- Dushu Lake Higher Education Town
- Suzhou
- P. R. China
| | - Zhen-Sheng Zhao
- Laboratory of Organic Nanophotonics and Laboratory of Bio-Inspired Smart Interface Science
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing
- P. R. China
| | - Xuan-Ming Duan
- Laboratory of Organic Nanophotonics and Laboratory of Bio-Inspired Smart Interface Science
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing
- P. R. China
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7
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Wang P, Liu Q, Zhang CY, Jiang J, Wang LH, Chen DY, Xu QF, Lu JM. Preparing non-volatile resistive switching memories by tuning the content of Au@air@TiO2-h yolk-shell microspheres in a poly(3-hexylthiophene) layer. NANOSCALE 2015; 7:19579-19585. [PMID: 26541116 DOI: 10.1039/c5nr05835j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Crystalline hybrid microspheres, encapsulating a Au nanocore in the hollow cavity of a hairy semiconductor TiO2 shell (Au@air@TiO2-h microspheres) were prepared using template-assisted synthesis methods. The as-prepared microspheres are dispersed into a poly(3-hexylthiophene) (P3HT) matrix and used as a memory active layer. The electrical rewritable memory effects of Al/[Au@air@TiO2-h + P3HT]/ITO sandwich devices can be effectively and exactly controlled by tuning the microsphere content in the electroactive layer. To clarify the switching mechanism, different components in the device, such as P3HT and the microspheres, have been investigated. And it was determined that the switching mechanism can be attributed to the formation and rupture of oxygen vacancy filaments. These results suggest that the Au@air@TiO2-h microspheres are potentially capable of high density data storage. In addition, this finding could provide important guidelines for the reproducibility of nanocomposite-based memory devices and is helpful to demonstrate the switching mechanism of these devices.
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Affiliation(s)
- Peng Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren'ai Road, Suzhou 215123, China.
| | - Quan Liu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren'ai Road, Suzhou 215123, China.
| | - Chun-Yu Zhang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren'ai Road, Suzhou 215123, China.
| | - Jun Jiang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren'ai Road, Suzhou 215123, China.
| | - Li-Hua Wang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren'ai Road, Suzhou 215123, China.
| | - Dong-Yun Chen
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren'ai Road, Suzhou 215123, China.
| | - Qing-Feng Xu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren'ai Road, Suzhou 215123, China.
| | - Jian-Mei Lu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, and Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, 199 Ren'ai Road, Suzhou 215123, China.
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8
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Caruntu D, Rostamzadeh T, Costanzo T, Parizi SS, Caruntu G. Solvothermal synthesis and controlled self-assembly of monodisperse titanium-based perovskite colloidal nanocrystals. NANOSCALE 2015; 7:12955-12969. [PMID: 26168304 DOI: 10.1039/c5nr00737b] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The rational design of monodisperse ferroelectric nanocrystals with controlled size and shape and their organization into hierarchical structures has been a critical step for understanding the polar ordering in nanoscale ferroelectrics, as well as the design of nanocrystal-based functional materials which harness the properties of individual nanoparticles and the collective interactions between them. We report here on the synthesis and self-assembly of aggregate-free, single-crystalline titanium-based perovskite nanoparticles with controlled morphology and surface composition by using a simple, easily scalable and highly versatile colloidal route. Single-crystalline, non-aggregated BaTiO3 colloidal nanocrystals, used as a model system, have been prepared under solvothermal conditions at temperatures as low as 180 °C. The shape of the nanocrystals was tuned from spheroidal to cubic upon changing the polarity of the solvent, whereas their size was varied from 16 to 30 nm for spheres and 5 to 78 nm for cubes by changing the concentration of the precursors and the reaction time, respectively. The hydrophobic, oleic acid-passivated nanoparticles exhibit very good solubility in non-polar solvents and can be rendered dispersible in polar solvents by a simple process involving the oxidative cleavage of the double bond upon treating the nanopowders with the Lemieux-von Rudloff reagent. Lattice dynamic analysis indicated that regardless of their size, BaTiO3 nanocrystals present local disorder within the perovskite unit cell, associated with the existence of polar ordering. We also demonstrate for the first time that, in addition to being used for fabricating large area, crack-free, highly uniform films, BaTiO3 nanocubes can serve as building blocks for the design of 2D and 3D mesoscale structures, such as superlattices and superparticles. Interestingly, the type of superlattice structure (simple cubic or face centered cubic) appears to be determined by the type of solvent in which the nanocrystals were dispersed. This approach provides an excellent platform for the synthesis of other titanium-based perovskite colloidal nanocrystals with controlled chemical composition, surface structure and morphology and for their assembly into complex architectures, therefore opening the door for the design of novel mesoscale functional materials/nanocomposites with potential applications in energy conversion, data storage and the biomedical field.
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Affiliation(s)
- Daniela Caruntu
- Department of Chemistry and Biochemistry, Central Michigan University, 1200, S. Franklin St., Mt. Pleasant, MI 48858, USA
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9
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Hernandez JST, Muriel AA, Tabares JA, Alcázar GAP, Bolaños A. Preparation of Fe3O4Nanoparticles and Removal of Methylene Blue through Adsorption. ACTA ACUST UNITED AC 2015. [DOI: 10.1088/1742-6596/614/1/012007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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10
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Wu D, Chen X, Chen T, Ding C, Wu W, Li J. Substrate-anchored and degradation-sensitive anti-inflammatory coatings for implant materials. Sci Rep 2015; 5:11105. [PMID: 26077243 PMCID: PMC4650647 DOI: 10.1038/srep11105] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2014] [Accepted: 04/24/2015] [Indexed: 12/27/2022] Open
Abstract
Implant materials need to be highly biocompatible to avoid inflammation in clinical practice. Although biodegradable polymeric implants can eliminate the need for a second surgical intervention to remove the implant materials, they may produce acidic degradation products in vivo and cause non-bacterial inflammation. Here we show the strategy of “substrate-anchored and degradation-sensitive coatings” for biodegradable implants. Using poly(lactic acid)/hydroxyapatite as an implant material model, we constructed a layer-by-layer coating using pH-sensitive star polymers and dendrimers loaded with an anti-inflammatory drug, which was immobilised through a hydroxyapatite-anchored layer. The multifunctional coating can effectively suppress the local inflammation caused by the degradation of implant materials for at least 8 weeks in vivo. Moreover, the substrate-anchored coating is able to modulate the degradation of the substrate in a more homogeneous manner. The “substrate-anchored and degradation-sensitive coating” strategy therefore exhibits potential for the design of various self-anti-inflammatory biodegradable implant materials.
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Affiliation(s)
- Duo Wu
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Xingyu Chen
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Tianchan Chen
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Chunmei Ding
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Wei Wu
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China
| | - Jianshu Li
- College of Polymer Science and Engineering, Sichuan University, Chengdu 610065, China.,State Key Laboratory of Polymer Materials Engineering, Sichuan University, Chengdu 610065, China
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11
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