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Yang H, Zhang LM. Hollow organic/inorganic hybrid nanoparticles from dextran-block-polypeptide copolymer: Double click reaction synthesis and properties. Int J Biol Macromol 2021; 181:1243-1253. [PMID: 34022305 DOI: 10.1016/j.ijbiomac.2021.05.101] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 05/08/2021] [Accepted: 05/15/2021] [Indexed: 01/28/2023]
Abstract
To increase the drug loading and prolong the drug release time, novel hollow organic/inorganic hybrid nanoparticles based on dextran-b-poly(L-glutamate-graft-3-mercaptopropyltrimethoxysilane) (Dex-b-P(ALG-g-MTPMS)) were prepared. First, a polysaccharide block polypeptide diblock copolymer, dextran-block-poly(γ-allyl-L-glutamate) (Dex-b-PALG) bearing allyl side-groups, has been synthesized by the combination of ring-opening polymerization and alkyne-azide [2 + 3] Huisgen's cycloaddition. Next, the allyl side-groups residing in the poly(γ-allyl-L-glutamate) block were further functionalized with 3-mercaptopropyltrimethoxysilane(MPTMS) by radical "thiol-ene" addition reactions. Finally, after a sol-gel process of the obtained copolymers, the novel organic/inorganic hybrid nanoparticles were prepared. The molecular structures, physicochemical, and self-assembly of these copolymers were characterized through FTIR, 1H NMR, dynamic light scattering (DLS), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The cross-linked hybrid nanoparticles have a higher drug loading ability and slower release rate as compared to the uncross-linked counterparts. The MTT evaluation demonstrated that the organic/inorganic hybrid nanoparticles with good biocompatibility.
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Affiliation(s)
- Huikang Yang
- DSAPM Lab and PCFM Lab, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China; Department of Radiology, Guangzhou First People's Hospital, School of Medicine, South China University of Technology, Guangzhou, Guangdong 510640, China.
| | - Li-Ming Zhang
- DSAPM Lab and PCFM Lab, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, China.
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2
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Wang L, Tang Z, Li D, Lin J, Guan Z. Adsorption and ordering of amphiphilic rod-coil block copolymers on a substrate: conditions for well-aligned stripe nanopatterns. NANOSCALE 2020; 12:13119-13128. [PMID: 32584339 DOI: 10.1039/d0nr01244k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Controlling the ordering of self-assembled nanostructures is vital in block copolymer nanotechnology but still presents a challenge. Here we demonstrated that the adsorption and ordering of amphiphilic rod-coil block copolymers on a substrate can generate well-aligned stripe nanopatterns by dissipative particle dynamics simulations. The effects of the copolymer concentration and the surface affinity on the formation of stripe nanopatterns were examined. The simulation results revealed that the well-aligned stripe nanopatterns with controllable thickness and stripe width can be obtained in the systems with higher copolymer concentration and surface affinity. An immersion coating experiment was designed to verify the simulation results, and an agreement is shown. The present work provides a strategy for constructing well-aligned stripe nanopatterns in a controllable way.
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Affiliation(s)
- Liquan Wang
- Shanghai Key Laboratory of Advanced Polymeric Materials, Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
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3
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Valdés O, Marican A, Mirabal-Gallardo Y, Santos LS. Selective and Efficient Arsenic Recovery from Water through Quaternary Amino-Functionalized Silica. Polymers (Basel) 2018; 10:polym10060626. [PMID: 30966660 PMCID: PMC6404077 DOI: 10.3390/polym10060626] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Revised: 05/25/2018] [Accepted: 05/30/2018] [Indexed: 11/16/2022] Open
Abstract
The free-radical graft polymerization of acryloxyethyl-trimethylammonium chloride onto commercial silica particles was studied experimentally for extraction of arsenic ions from water. Two steps were used to graft acryloxyethyl-trimethylammonium chloride (Q) onto the surface of nanosilica: anchoring vinyltrimethoxysilane (VTMSO) onto the surface of silica to modify it with double bonds and then grafting Q onto the surface of silica with potassium persulfate as an initiator. The products were characterized by Fourier-transform infrared (FT-IR), the thermogravimetric analysis (TGA), scanning electron microscopy (SEM), 13C, 29Si nuclear magnetic resonance (NMR), and X-ray powder diffraction (XRD). The results showed that it is easy to graft Q onto the surface of silica under radical polimerization. The morphology analysis of silica and modified silica indicated that the silica decreased the size scale after modification. Q/VTMSO-SiO₂ was tested for its ability to remove arsenic from drinking water. The results show that the new silica hybrid particles efficiently remove all arsenate ions. In addition, Q/VTMSO-SiO₂ showed better sorption capacities for other metal ions (such as copper, zinc, chromium, uranium, vanadium, and lead) than a commercial water filter.
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Affiliation(s)
- Oscar Valdés
- Vicerrectoría de Investigación y Postgrado, Universidad Católica del Maule, 3460000 Talca, Chile.
| | - Adolfo Marican
- Instituto de Química de Recursos Naturales, Universidad de Talca, 3460000 Talca, Chile.
| | - Yaneris Mirabal-Gallardo
- Instituto de Ciencias Químicas Aplicadas, Facultad de Ingeniería en Construcción, Universidad Autónoma de Chile, 3460000 Talca, Chile.
| | - Leonardo S Santos
- Laboratory of Asymmetric Synthesis, Instituto de Química de Recursos Naturales, Universidad de Talca, 3460000 Talca, Chile.
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4
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Czarnecki S, Bertin A. Hybrid Silicon-Based Organic/Inorganic Block Copolymers with Sol-Gel Active Moieties: Synthetic Advances, Self-Assembly and Applications in Biomedicine and Materials Science. Chemistry 2018; 24:3354-3373. [PMID: 29218744 DOI: 10.1002/chem.201705286] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Indexed: 11/11/2022]
Abstract
Hybrid silicon-based organic/inorganic (multi)block copolymers are promising polymeric precursors to create robust nano-objects and nanomaterials due to their sol-gel active moieties via self-assembly in solution or in bulk. Such nano-objects and nanomaterials have great potential in biomedicine as nanocarriers or scaffolds for bone regeneration as well as in materials science as Pickering emulsifiers, photonic crystals or coatings/films with antibiofouling, antibacterial or water- and oil-repellent properties. Thus, this Review outlines recent synthetic efforts in the preparation of these hybrid inorganic/organic block copolymers, gives an overview of their self-assembled structures and finally presents recent examples of their use in the biomedical field and material science.
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Affiliation(s)
- Sebastian Czarnecki
- German Federal Institute for Materials Research and Testing (BAM), Dpt. 6. Materials Protection and Surface Technology, Unter den Eichen 87, 12205, Berlin, Germany
| | - Annabelle Bertin
- German Federal Institute for Materials Research and Testing (BAM), Dpt. 6. Materials Protection and Surface Technology, Unter den Eichen 87, 12205, Berlin, Germany.,Freie Universität Berlin, Institute of Chemistry and Biochemistry-Organic Chemistry, Takustr. 3, 14195, Berlin, Germany
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5
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Murugan P, Krishnamurthy M, Jaisankar SN, Samanta D, Mandal AB. Controlled decoration of the surface with macromolecules: polymerization on a self-assembled monolayer (SAM). Chem Soc Rev 2015; 44:3212-43. [PMID: 25839067 DOI: 10.1039/c4cs00378k] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Polymer functionalized surfaces are important components of various sensors, solar cells and molecular electronic devices. In this context, the use of self-assembled monolayer (SAM) formation and subsequent reactions on the surface have attracted a lot of interest due to its stability, reliability and excellent control over orientation of functional groups. The chemical reactions to be employed on a SAM must ensure an effective functional group conversion while the reaction conditions must be mild enough to retain the structural integrity. This synthetic constraint has no universal solution; specific strategies such as "graft from", "graft to", "graft through" or "direct" immobilization approaches are employed depending on the nature of the substrate, polymer and its area of applications. We have reviewed current developments in the methodology of immobilization of a polymer in the first part of the article. Special emphasis has been given to the merits and demerits of certain methods. Another issue concerns the utility - demonstrated or perceived - of conjugated or non-conjugated macromolecules anchored on a functionally decorated SAM in the areas of material science and biotechnology. In the last part of the review article, we looked at the collective research efforts towards SAM-based polymer devices and identified major pointers of progress (236 references).
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Affiliation(s)
- P Murugan
- Polymer Division, Council of Scientific and Industrial Research (CSIR)-CLRI, Adyar, Chennai-600020, India.
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6
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Xie MX, Jiang L, Xu ZP, Chen DY. Monofunctional polymer nanoparticles prepared through intramolecularly cross-linking the polymer chains sparsely grafted on the surface of sacrificial silica spheres. Chem Commun (Camb) 2015; 51:1842-5. [DOI: 10.1039/c4cc07885c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polymeric monofunctional nanoparticles with exactly one functional group on the surface of each nanoparticle are prepared.
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Affiliation(s)
- M. X. Xie
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science
- Fudan University
- Shanghai 200433
- P. R. China
| | - L. Jiang
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science
- Fudan University
- Shanghai 200433
- P. R. China
| | - Z. P. Xu
- Australian Institute for Bioengineering and Nanotechnology
- The University of Queensland
- St. Lucia
- Australia
| | - D. Y. Chen
- The State Key Laboratory of Molecular Engineering of Polymers and Department of Macromolecular Science
- Fudan University
- Shanghai 200433
- P. R. China
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7
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Tsai JD, Yang CI. Utilization of a ligand containing 2,2′-bipyridyl and tetrazolate groups to construct a 2D Co(ii) coordination polymer: spin canting and metamagnetism. Dalton Trans 2014; 43:15576-82. [DOI: 10.1039/c4dt01793e] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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8
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Sun W, Zhou S, You B, Wu L. Polymer Brush-Functionalized Surfaces with Reversible, Precisely Controllable Two-Way Responsive Wettability. Macromolecules 2013. [DOI: 10.1021/ma401416k] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Wei Sun
- Department of Materials Science
and State Key Laboratory of Molecular Engineering of Polymers, Advanced
Coatings Research Center of MEC, Fudan University, Shanghai 200433, China
| | - Shouxue Zhou
- Department of Materials Science
and State Key Laboratory of Molecular Engineering of Polymers, Advanced
Coatings Research Center of MEC, Fudan University, Shanghai 200433, China
| | - Bo You
- Department of Materials Science
and State Key Laboratory of Molecular Engineering of Polymers, Advanced
Coatings Research Center of MEC, Fudan University, Shanghai 200433, China
| | - Limin Wu
- Department of Materials Science
and State Key Laboratory of Molecular Engineering of Polymers, Advanced
Coatings Research Center of MEC, Fudan University, Shanghai 200433, China
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9
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Homo- and mixed polymer brushes prepared by surface-grafting of asymmetric non-sticky/sticky diblock copolymers and their stimuli–responsive behaviors. REACT FUNCT POLYM 2013. [DOI: 10.1016/j.reactfunctpolym.2012.09.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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10
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Jhu ZR, Yang CI, Lee GH. Two new series of rare-earth organic frameworks involving two structural architectures: syntheses, structures and magnetic properties. CrystEngComm 2013. [DOI: 10.1039/c3ce26766k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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11
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Zengin A, Caykara T. RAFT-mediated synthesis of poly[(oligoethylene glycol) methyl ether acrylate] brushes for biological functions. ACTA ACUST UNITED AC 2012. [DOI: 10.1002/pola.26250] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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12
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Jhon YK, Arifuzzaman S, Özçam AE, Kiserow DJ, Genzer J. Formation of polyampholyte brushes via controlled radical polymerization and their assembly in solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:872-882. [PMID: 22112235 DOI: 10.1021/la203697a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We describe the formation of polyampholytic block copolymer brushes and their assembly in solution. Specifically, we employ "surface-initiated" activators regenerated by electron transfer atom transfer radical polymerization (ARGET-ATRP) sequentially to form diblock copolymer grafts comprising blocks of poly[2-(dimethylamino)ethyl methacrylate] (PDMAEMA) and poly(sodium methacrylate) (PNaMA) on flat impenetrable silica surfaces, i.e., SiO(x)/PNaMA-b-PDMAEMA and SiO(x)/PDMAEMA-b-PNaMA. Protonation of the PNaMA block results in formation of poly(methacrylic acid) (PMAA). We demonstrate that ARGET-ATRP of NaMA provides a convenient route to preparation of PMAA, which is an alternative method to the more traditional approach based on preparing PMAA by polymerizing tert-butyl methacrylate (tBMA) followed by cleavage of the tert-butyl group. We also discuss conformational changes of the individual polyelectrolyte blocks in solution as a function of solution pH by monitoring adsorption behavior of functionalized polystyrene spheres.
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Affiliation(s)
- Young K Jhon
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina 27695-7905, United States
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13
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Novel, highly selective gold nanoparticle patterning on surfaces using pure water. J Colloid Interface Sci 2011; 364:304-10. [DOI: 10.1016/j.jcis.2011.08.072] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2011] [Revised: 07/21/2011] [Accepted: 08/29/2011] [Indexed: 11/19/2022]
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14
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Min J, Shah PN, Ahn JH, Lee JS. Effects of Different Reactive Oxyanionic Initiators on the Anionic Polymerizaition of n-Hexyl Isocyanate. Macromolecules 2011. [DOI: 10.1021/ma200414f] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Joonkeun Min
- Department of Nanobio Materials and Electronics and School of Material Science and Engineering, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea
| | - Priyank N. Shah
- Department of Nanobio Materials and Electronics and School of Material Science and Engineering, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea
| | - Jun-Hwan Ahn
- Department of Nanobio Materials and Electronics and School of Material Science and Engineering, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea
| | - Jae-Suk Lee
- Department of Nanobio Materials and Electronics and School of Material Science and Engineering, Gwangju Institute of Science and Technology (GIST), 1 Oryong-dong, Buk-gu, Gwangju 500-712, Korea
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15
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Jia X, Jiang X, Liu R, Yin J. Ultrafast generation of thick poly(ether amine) (PEA) brush on a gold surface and its protein resistance. Chem Commun (Camb) 2011; 47:1276-8. [DOI: 10.1039/c0cc04181e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Yang CI, Song YT, Yeh YJ, Liu YH, Tseng TW, Lu KL. A flexible tris-phosphonate for the design of copper and cobalt coordination polymers: unusual cage array topology and magnetic properties. CrystEngComm 2011. [DOI: 10.1039/c0ce00439a] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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17
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Chang WH, Chou SH, Lin JJ, Chen WC, Sheng YJ. Thin film morphologies of π-conjugated rod-coil block copolymers with thermoresponsive property: A combined experimental and molecular simulation study. J Chem Phys 2010; 132:214901. [DOI: 10.1063/1.3428761] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
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18
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Chen F, Jiang X, Liu R, Yin J. Well-defined PMMA brush on silica particles fabricated by surface-initiated photopolymerization (SIPP). ACS APPLIED MATERIALS & INTERFACES 2010; 2:1031-1037. [PMID: 20423123 DOI: 10.1021/am900758j] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
The photochemical method is a convenient and simple way to synthesize the polymer brush on surface. We presented here a facile approach to fabricate PMMA brush on silica particles (SPs) by combination of self-assembly monolayer of hyperbranched polymeric thioxanthone (HPTX) and surface-initiated photopolymerization (SIPP). HPTX was immobilized on the surface of silica particles (SPs) through nucleophilic addition between amine and epoxy groups, and then initiated photopolymerization of MMA to generate PMMA brush on SPs at room temperature. The whole process was well-traced by FT-IR, TGA, SEM, and TEM. The results show that it is easy to create PMMA brushes of tunable thickness under UV irradiation. Especially, TEM images reveal the obvious formation of well-defined hybrid particles with SPs as the core and PMMA layers as the shell. The obtained hybrid particles can be implanted into PMMA matrix to produce PMMA composite with enhanced thermal and mechanical properties.
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Affiliation(s)
- Fengting Chen
- Shanghai Jiao Tong University, Shanghai 200240, People's Republic of China
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19
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Liu P, Sun J, Huang J, Peng R, Tang J, Ding J. Fabrication of micropatterns of nanoarrays on a polymeric gel surface. NANOSCALE 2010; 2:122-7. [PMID: 20648373 DOI: 10.1039/b9nr00124g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Micro-nano patterns of gold on the surface of poly(ethylene glycol) (PEG) hydrogels were prepared. The approach combines the technique of conventional photolithography (a top-down method for micropatterns), block copolymer micelle nanolithography (a bottom-up method for gold nanopatterns), and a linker-assistant technique to transfer a pattern on a hard surface to a polymeric surface. Hybrid micro-nano patterns on hydrogels were characterized using scanning electron microscopy, atomic force microscopy and X-ray photoelectron spectroscopy. The patterned Au nanoparticles were further modified by a peptide containing arginine-glycine-aspatate (RGD). The cell-adhesion contrast of the patterned hydrogel surface was confirmed by preliminary cell experiments.
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Affiliation(s)
- Peng Liu
- Key Laboratory of Molecular Engineering of Polymers of Ministry of Education, Department of Macromolecular Science, Laboratory of Advanced Materials, Fudan University, Shanghai, China
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Abstract
It's all about polymers! Polymers play a key role in the patterning and functionalization of surfaces by microcontact printing. Polymers are versatile stamps, inks and substrates and microcontact printing can provide microstructured polymer surfaces in a single printing step.
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Affiliation(s)
- Tobias Kaufmann
- Organic Chemistry Institute
- Westfälische Wilhelms-Universität Münster
- Münster
- Germany
| | - Bart Jan Ravoo
- Organic Chemistry Institute
- Westfälische Wilhelms-Universität Münster
- Münster
- Germany
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21
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Park JW, Kim H, Han M. Polymeric self-assembled monolayers derived from surface-active copolymers: a modular approach to functionalized surfaces. Chem Soc Rev 2010; 39:2935-47. [DOI: 10.1039/b918135k] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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22
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Sung D, Park S, Jon S. Facile method for selective immobilization of biomolecules on plastic surfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:11289-94. [PMID: 19739621 DOI: 10.1021/la902784g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
A key aspect of biochip and biosensor preparation is optimizing surface attachment of biomolecules. Here, we report a facile approach for selectively immobilizing biomolecules on amphiphilic polymer-coated plastic surfaces with anti-biofouling properties. To modify plastic surfaces, we synthesized two types of random copolymers by radical polymerization, which consisted of three parts: an anchoring group; a PEG component, which acted as a repellent of nonspecific biomolecules; and a functional group, to which biomolecules were conjugated. Dodecyl- and benzyl-based copolymers were highly soluble in water, presumably due to the presence of multiple PEG groups, and could easily coat the model plastic surface (polystyrene) in an aqueous environment. The antibiofouling property of each polymer-coated plastic surface was examined by measuring the extent of nonspecific protein adsorption using bovine serum albumin (BSA). Both polymer-coated plastic surfaces showed a very low level of BSA adsorption relative to that of an uncoated plastic surface (control). Finally, we showed that streptavidin and antibodies, as representative biomolecules, could be selectively immobilized on the polymer-coated plastic surfaces imprinted with biotin and protein A, respectively, by microcontact printing, exhibiting an intense signal with low background.
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Affiliation(s)
- Daekyung Sung
- Graduate Program of Medical System Engineering, Department of Life Sciences, Gwangju Institute of Science and Technology, Gwangju, Korea
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23
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Jia X, Jiang X, Liu R, Yin J. Poly(N
-isopropylacrylamide) Brush Fabricated by Surface-Initiated Photopolymerization and its Response to Temperature. MACROMOL CHEM PHYS 2009. [DOI: 10.1002/macp.200900291] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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24
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Cao Z, Du B, Chen T, Nie J, Xu J, Fan Z. Preparation and properties of thermo-sensitive organic/inorganic hybrid microgels. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:12771-8. [PMID: 18950208 DOI: 10.1021/la802087n] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
By utilizing the hydrolysis and condensation of the methoxysilyl groups, thermo-sensitive organic/inorganic hybrid poly[ N-isopropylacrylamide- co-3-(trimethoxysilyl)propylmethacrylate] [P(NIPAm- co-TMSPMA)] microgels were successfully prepared via two different methods without addition of any surfactant. First, the microgels were obtained by a two-step method; that is, the linear copolymer P(NIPAm- co-TMSPMA) was first synthesized by free radical copolymerization, and the aqueous solution of the copolymer was then heated above its low critical solution temperature (LCST) to give colloid particles, which were subsequently cross-linked via the hydrolysis and condensation of the methoxysilyl groups to form the microgels. Second, the microgels were also prepared via conventional surfactant-free emulsion polymerization (SFEP) of the monomers NIPAm and TMSPMA. TMSPMA can act as the cross-linkable monomer. No surfactant was involved in the preparation of the hybrid microgels. The obtained microgels were rather spherical and exhibited reversible thermo-sensitive behavior. The size, morphology, swellability, and phase transition behavior of the microgels were dependent on the initial copolymer or monomer concentration, preparation temperature, and the content of TMSPMA. The size of microgels obtained by SFEP was found to be more uniform than that by the two-step method. The hybrid microgels obtained by these two methods had more homogeneous microstructures than those prepared via conventional emulsion polymerization with chemical cross-linker N, N'-methylene-bisacrylamide.
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Affiliation(s)
- Zheng Cao
- Key Laboratory of Macromolecular Synthesis and Functionalization (Ministry of Education), Department of Polymer Science and Engineering, Zhejian University, Hangzhou 310027, China
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25
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Liu L, Kim JK, Gunawidjaja R, Tsukruk VV, Lee M. Toroid morphology by ABC-type amphiphilic rod-coil molecules at the air-water interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:12340-12346. [PMID: 18837526 DOI: 10.1021/la8023106] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The interfacial and aggregation behavior of the ABC-type amphiphilic molecules with semirigid dumbbell-shaped core and variable length of hydrophobic branched tails (R=(CH2)nCH3 with n=5 (1), 9 (2), 13 (3)) were investigated. At low surface pressure, smooth, uniform monolayers were formed at the air-water interface by molecules 1 and 2, whereas for molecule 3 unique 2D toroid aggregates have been formed. These aggregates were relatively stable within a range of surface pressure and spreading solution concentration. Upon compression, the 2D toroid aggregates collapsed into large, round 3D aggregates. Finally, the choice of spreading solvent has a great influence on aggregation formation into 2D or 3D micelles as a result of the variable balance of the hydrophobic interactions of branched tails and the pi-pi stacking interaction between aromatic segments.
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Affiliation(s)
- Libin Liu
- Center for Supramolecular Nano-Assembly, Department of Chemistry, Yonsei University, Seoul 120-749, Korea
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26
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Yuan J, Xu Y, Walther A, Bolisetty S, Schumacher M, Schmalz H, Ballauff M, Müller AHE. Water-soluble organo-silica hybrid nanowires. NATURE MATERIALS 2008; 7:718-722. [PMID: 18641655 DOI: 10.1038/nmat2232] [Citation(s) in RCA: 143] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2008] [Accepted: 06/24/2008] [Indexed: 05/26/2023]
Abstract
There has been growing interest in the past decade in one-dimensional (1D) nanostructures, such as nanowires, nanotubes or nanorods, owing to their size-dependent optical and electronic properties and their potential application as building blocks, interconnects and functional components for assembling nanodevices. Significant progress has been made; however, the strict control of the distinctive geometry at extremely small size for 1D structures remains a great challenge in this field. The anisotropic nature of cylindrical polymer brushes has been applied to template 1D nanostructured materials, such as metal, semiconductor or magnetic nanowires. Here, by constructing the cylindrical polymer brushes themselves with a precursor-containing monomer, we successfully synthesized hybrid nanowires with a silsesquioxane core and a shell made up from oligo(ethylene glycol) methacrylate units, which are soluble in water and many organic solvents. The length and diameter of these rigid wires are tunable by the degrees of polymerization of both the backbone and the side chain. They show lyotropic liquid-crystalline behaviour and can be pyrolysed to silica nanowires. This approach provides a route to the controlled fabrication of inorganic or hybrid silica nanostructures by living polymerization techniques.
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Cao Z, Du B, Chen T, Li H, Xu J, Fan Z. Fabrication and properties of thermosensitive organic/inorganic hybrid hydrogel thin films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:5543-51. [PMID: 18439032 DOI: 10.1021/la8000653] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We report on a facile method for fabricating thermosensitive organic/inorganic hybrid hydrogel thin films from a cross-linkable organic/inorganic hydrid copolymer, poly[ N-isopropylacrylamide- co-3-(trimethoxysilyl)propylmethacrylate] [P(NIPAm- co-TMSPMA)]. Fourier transform infrared (FT-IR) spectra confirmed the formation of hybrid hydrogel thin films after hydrolysis of the methoxysilyl groups (Si-O-CH 3) and subsequent condensation of the silanol groups (Si-OH). Atomic force microscopy (AFM) images revealed that the surface morphology of the hydrogel thin films depended on the supporting substrates. Microdomains were observed for the hydrogel thin films on a gold surface, which can be attributed to inhomogeneous network structures. The thermoresponsive swelling-deswelling behavior and the viscoelastic properties of the hydrogel thin films were investigated as a function of temperature (25-45 degrees C) by using a quartz crystal microbalance (QCM) operated in water. The high frequency shear modulus of the P(NIPAm- co-TMPSMA) hydrogel thin films was several hundred kilopascals.
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Affiliation(s)
- Zheng Cao
- Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, China
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Yang SY, Kim DY, Jeong SM, Park JW. Stimuli-Responsive Hybrid Coatings of Polyelectrolyte Multilayers and Nano-Patterned Polymer Brushes. Macromol Rapid Commun 2008. [DOI: 10.1002/marc.200800017] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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29
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Li CS, Wu WC, Sheng YJ, Chen WC. Effects of chain architectures on the surface structures of conjugated rod-coil block copolymer brushes. J Chem Phys 2008; 128:154908. [DOI: 10.1063/1.2904866] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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30
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Kim JH, Rahman MS, Lee JS, Park JW. Self-Organization of an Amphiphilic Rod−Coil−Rod Block Copolymer into Liquid Crystalline, Substrate-Supported Monolayers and Bilayers. Macromolecules 2008. [DOI: 10.1021/ma702695a] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jee-Hyuk Kim
- Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Buk-gu, 1 Oryong-dong, Gwangju 500-712, Korea
| | - M. Shahinur Rahman
- Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Buk-gu, 1 Oryong-dong, Gwangju 500-712, Korea
| | - Jae-Suk Lee
- Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Buk-gu, 1 Oryong-dong, Gwangju 500-712, Korea
| | - Ji-Woong Park
- Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Buk-gu, 1 Oryong-dong, Gwangju 500-712, Korea
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31
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Kim JH, Rahman MS, Lee JS, Park JW. Liquid Crystalline Ordering in the Self-Assembled Monolayers of Tethered Rodlike Polymers. J Am Chem Soc 2007; 129:7756-7. [PMID: 17536807 DOI: 10.1021/ja072412e] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jee-Hyuk Kim
- Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, 1 Oryong-Dong, Buk-Gu, Gwangju 500-712, Korea
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32
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Zhou J, Wang L, Dong X, Yang Q, Wang J, Yu H, Chen X. Preparation of organic/inorganic hybrid nanomaterials using aggregates of poly(stearyl methacrylate)-b-poly(3-(trimethoxysilyl) propyl methacrylate) as precursor. Eur Polym J 2007. [DOI: 10.1016/j.eurpolymj.2006.09.022] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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33
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Wu WC, Tian Y, Chen CY, Lee CS, Sheng YJ, Chen WC, Jen AKY. Theoretical and experimental studies on the surface structures of conjugated rod-coil block copolymer brushes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2007; 23:2805-14. [PMID: 17249707 DOI: 10.1021/la0631769] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
A combined theoretical and experimental investigation of conjugated rod-coil block copolymer brushes is reported. The theoretical study for the surface structures of rod-coil block copolymer brushes was established based on the simulation method of dissipative particle dynamics. The effects of solvent stimuli, grafting density, and rod-coil block ratio of the polymer brushes on the surface structures were examined. The rod blocks of polymer brushes were found to be well-dispersed on the surface in their good solvents. On the other hand, aggregative domains of the rod blocks were formed in their poor solvents with the conformations of isolated islands or worm-like structures depending on the grafting density of the polymer brushes. The aggregative domains tend to stay on top of the coil blocks for small rod-to-coil block ratio. However, the submergence of the aggregative domains into the coil blocks is thermodynamically preferred for large enough rod-to-coil block ratio. New multifunctional amphiphilic rod-coil block copolymers, poly-[2,7-(9,9-di-n-hexylfluorene)]-block-poly-[poly(ethylene glycol) methyl ether methacrylate]-block-poly-[3(tripropoxysilyl)propyl methacrylate] (PF-b-PPEGMA-b-PPOPS), with two different block ratios were synthesized and used to prepare the corresponding polymer brushes via the grafting- method. The effects of stimuli factors on the surface structures characterized by the atomic force microscopy images were consistent with the theoretical results. Furthermore, the photophysical properties of PF-b-PPEGMA-b-PPOPS brushes were significantly varied by the solvent stimuli. The emission peaks originated from the aggregation and/or excimer formation of PF blocks were observed after methanol treatment. The photoluminescence intensity and its efficiency were well correlated to the surface structure and the methanol content in mixed solvents. Our study demonstrates how the surface structures and photophysical properties of rod-coil block copolymer brushes response to environmental stimuli.
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Affiliation(s)
- Wen-Chung Wu
- Department of Chemical Engineering and Institute of Polymer Science and Engineering, National Taiwan University, Taipei, Taiwan 106
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34
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Park JW, Cho YH. Surface-induced morphologies in thin films of a rod-coil diblock copolymer. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2006; 22:10898-903. [PMID: 17154560 DOI: 10.1021/la062352a] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
A block copolymer containing a rodlike block is studied for its adsorption and formation of nanostructured thin films on the substrate surface. The block copolymer is poly(styrene-b-3-triethoxysilylpropylisocyanate) (PS-b-PIC) of which the PIC chain consists of repeating amide units with triethoxysilyl side groups. As the copolymer chains are adsorbed onto silica surfaces, the PIC blocks pack laterally on the plane in a smectic manner, and the PS chains segregate along the ordered PIC chains, resulting in stripe patterns. The width of the stripes formed on the silica surface appeared to be much larger that on the carbon surface. This was accounted for by the bilayered smectic packing of the rod blocks that is induced by rod-surface attractive interaction. The periodicity of the stripe pattern on the carbon surface indicates that interdigitated packing is preferred by the copolymers on the hydrophobic surface in a manner similar to those in the bulk state of rod-coils. Excess rod-coils on the bilayered smectic layer resulted in a terraced morphology due to large difference in the periodicity between the bilayered smectic layer at the substrate surface and the interdigitated smectic layer in the bulk.
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Affiliation(s)
- Ji-Woong Park
- Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Buk-gu, Oryong-dong 1, Gwangju 500-712, Korea.
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35
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Park JW, Thomas EL. Frustrated Crystallization of a Rod−Coil Block Copolymer from Its Liquid Crystalline State. Macromolecules 2006. [DOI: 10.1021/ma060336e] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ji-Woong Park
- Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Oryong-dong 1, Buk-gu, Gwangju 500-712, Korea, and Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
| | - Edwin L. Thomas
- Department of Materials Science and Engineering, Gwangju Institute of Science and Technology, Oryong-dong 1, Buk-gu, Gwangju 500-712, Korea, and Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
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36
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Chen Y, Du J, Xiong M, Zhang K, Zhu H. Gelation Inside Block Copolymer Aggregates and Organic/Inorganic Nanohybrids. Macromol Rapid Commun 2006. [DOI: 10.1002/marc.200600128] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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37
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Liu G, Yan L, Chen X, Zhang G. Study of the kinetics of mushroom-to-brush transition of charged polymer chains. POLYMER 2006. [DOI: 10.1016/j.polymer.2006.02.091] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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38
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Yuan W, Jiang G, Wang J, Wang G, Song Y, Jiang L. Temperature/Light Dual-Responsive Surface with Tunable Wettability Created by Modification with an Azobenzene-Containing Copolymer. Macromolecules 2006. [DOI: 10.1021/ma051989i] [Citation(s) in RCA: 68] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Wenfang Yuan
- Organic Solids Laboratory, Institute of Chemistry & Center for Molecular Science, Chinese Academy of Sciences, Beijing, 100080, P. R. China
| | - Guiyuan Jiang
- Organic Solids Laboratory, Institute of Chemistry & Center for Molecular Science, Chinese Academy of Sciences, Beijing, 100080, P. R. China
| | - Jingxia Wang
- Organic Solids Laboratory, Institute of Chemistry & Center for Molecular Science, Chinese Academy of Sciences, Beijing, 100080, P. R. China
| | - Guojie Wang
- Organic Solids Laboratory, Institute of Chemistry & Center for Molecular Science, Chinese Academy of Sciences, Beijing, 100080, P. R. China
| | - Yanlin Song
- Organic Solids Laboratory, Institute of Chemistry & Center for Molecular Science, Chinese Academy of Sciences, Beijing, 100080, P. R. China
| | - Lei Jiang
- Organic Solids Laboratory, Institute of Chemistry & Center for Molecular Science, Chinese Academy of Sciences, Beijing, 100080, P. R. China
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39
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Holzmueller J, Genson KL, Park Y, Yoo YS, Park MH, Lee M, Tsukruk V. Amphiphilic treelike rods at interfaces: layered stems and circular aggregation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2005; 21:6392-8. [PMID: 15982046 DOI: 10.1021/la0504107] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Amphiphilic dendron-rod molecules with three hydrophilic poly(ethylene oxide) (PEO) branches attached to a hydrophobic octa-p-phenylene rod stem were investigated for their ability to form two-dimensional micellar structures on a solid surface. A treelike shape of the molecules was reported to be a major factor in the formation of nonplanar micellar structures in solution and in the bulk state (cylindrical and spherical). We observed that in these treelike amphiphilic molecules the hydrophilic terminated dendron branches assemble themselves in surface monolayers with the formation of two-dimensional layered or circular micellar structures. We suggested the formation of the planar ribbon-like structures with interdigitated layering within the loosely packed monolayers and circular, ringlike structures (2D circular aggregates) in the precollapsed state.
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Affiliation(s)
- Jason Holzmueller
- Materials Science and Engineering, Iowa State University, Ames, Iowa 50011, USA
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40
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Cai QJ, Fu GD, Zhu FR, Kang E, Neoh K. GaAs–Polymer Hybrids Formed by Surface‐Initiated Atom‐Transfer Radical Polymerization of Methyl Methacrylate. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200461570] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Qin Jia Cai
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore 119260, Singapore, Fax: (+65) 6779‐1936
- Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Singapore
| | - Guo Dong Fu
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore 119260, Singapore, Fax: (+65) 6779‐1936
| | - Fu Rong Zhu
- Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Singapore
| | - En‐Tang Kang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore 119260, Singapore, Fax: (+65) 6779‐1936
| | - Koon‐Gee Neoh
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore 119260, Singapore, Fax: (+65) 6779‐1936
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41
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Cai QJ, Fu GD, Zhu FR, Kang ET, Neoh KG. GaAs–Polymer Hybrids Formed by Surface‐Initiated Atom‐Transfer Radical Polymerization of Methyl Methacrylate. Angew Chem Int Ed Engl 2005; 44:1104-1107. [PMID: 15643652 DOI: 10.1002/anie.200461570] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Qin Jia Cai
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore 119260, Singapore, Fax: (+65) 6779-1936
- Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Singapore
| | - Guo Dong Fu
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore 119260, Singapore, Fax: (+65) 6779-1936
| | - Fu Rong Zhu
- Institute of Materials Research and Engineering, 3 Research Link, Singapore 117602, Singapore
| | - En-Tang Kang
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore 119260, Singapore, Fax: (+65) 6779-1936
| | - Koon-Gee Neoh
- Department of Chemical and Biomolecular Engineering, National University of Singapore, Kent Ridge, Singapore 119260, Singapore, Fax: (+65) 6779-1936
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42
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Park JW, Thomas EL. Anisotropic Micellar Nanoobjects from Reactive Liquid Crystalline Rod−Coil Diblock Copolymers. Macromolecules 2004. [DOI: 10.1021/ma035921j] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ji-Woong Park
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
| | - Edwin L. Thomas
- Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139
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Pyun J, Jia S, Kowalewski T, Matyjaszewski K. Synthesis and Surface Attachment of ABC Triblock Copolymers Containing Glassy and Rubbery Segments. MACROMOL CHEM PHYS 2004. [DOI: 10.1002/macp.200300070] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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44
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Shin YD, Han SH, Samal S, Lee JS. Synthesis of poly(2-vinyl pyridine)-b-poly(n-hexyl isocyanate) amphiphilic coil-rod block copolymer by anionic polymerization. ACTA ACUST UNITED AC 2004. [DOI: 10.1002/pola.20530] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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45
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Cozzoli PD, Kornowski A, Weller H. Low-Temperature Synthesis of Soluble and Processable Organic-Capped Anatase TiO2Nanorods. J Am Chem Soc 2003; 125:14539-48. [PMID: 14624603 DOI: 10.1021/ja036505h] [Citation(s) in RCA: 865] [Impact Index Per Article: 41.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We demonstrate the controlled growth of high aspect ratio anatase TiO2 nanorods by hydrolysis of titanium tetraisopropoxide (TTIP) in oleic acid (OLEA) as surfactant at a temperature as low as 80 degrees C. Chemical modification of TTIP by OLEA is proven to be a rational strategy to tune the reactivity of the precursor toward water. The most influential factors in shape control of the nanoparticles are investigated by simply manipulating their growth kinetics. The presence of tertiary amines or quaternary ammonium hydroxides as catalysts is essential to promote fast crystallization under mild conditions. The novelty of the present approach relies on the large-scale production of organic-capped TiO2 nanocrystals to which standard processing of colloidal nanocrystals, such as surface ligand exchange, can be applied for the first time. Concentrated colloidal titania dispersions can be prepared for a number of fundamental studies in homogeneous solutions and represent a new source of easily processable oxide material for many technological applications.
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Affiliation(s)
- P Davide Cozzoli
- Institute of Physical Chemistry, University of Hamburg, Bundesstrasse 45, D-20146 Hamburg, Germany
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