99951
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Xia D, Marszalek T, Li M, Guo X, Baumgarten M, Pisula W, Müllen K. Solution-Processable n-Type Organic Semiconductors Based on Angular-Shaped 2-(12H-Dibenzofluoren-12-ylidene)malononitrilediimide. Org Lett 2015; 17:3074-7. [DOI: 10.1021/acs.orglett.5b01343] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Debin Xia
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Tomasz Marszalek
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Mengmeng Li
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Xin Guo
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Martin Baumgarten
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Wojciech Pisula
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
- Department
of Molecular Physics, Lodz University of Technology, Zeromskiego
116, 90-924 Lodz, Poland
| | - Klaus Müllen
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
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99952
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Luo Z, Cheng B, Cui S. Effects of Water on the Single-Chain Elasticity of Poly(U) RNA. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6107-6113. [PMID: 25989243 DOI: 10.1021/acs.langmuir.5b01313] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Water, the dominant component under the physiological condition, is a complicated solvent which greatly affects the properties of solute molecules. Here, we utilize atomic force microscope-based single-molecule force spectroscopy to study the influence of water on the single-molecule elasticity of an unstructured single-stranded RNA (poly(U)). In nonpolar solvents, RNA presents its inherent elasticity, which is consistent with the theoretical single-chain elasticity calculated by quantum mechanics calculations. In aqueous buffers, however, an additional energy of 1.88 kJ/mol·base is needed for the stretching of the ssRNA chain. This energy is consumed by the bound water rearrangement (Ew) during chain elongation. Further experimental results indicate that the Ew value is uncorrelated to the salt concentrations and stretching velocity. The results obtained in an 8 M guanidine·HCl solution provide more evidence that the bound water molecules around RNA give rise to the observed deviation between aqueous and nonaqueous environments. Compared to synthetic water-soluble polymers, the value of Ew of RNA is much lower. The weak interference of water is supposed to be the precondition for the RNA secondary structure to exist in aqueous solution.
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Affiliation(s)
- Zhonglong Luo
- Key Lab of Advanced Technologies of Materials, Ministry of Education of China, Southwest Jiaotong University, Chengdu 610031, China
| | - Bo Cheng
- Key Lab of Advanced Technologies of Materials, Ministry of Education of China, Southwest Jiaotong University, Chengdu 610031, China
| | - Shuxun Cui
- Key Lab of Advanced Technologies of Materials, Ministry of Education of China, Southwest Jiaotong University, Chengdu 610031, China
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99953
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Samyn P, Van Nieuwkerke D, Schoukens G, Stanssens D, Vonck L, Van den Abbeele H. Hybrid palm-oil/styrene-maleimide nanoparticles synthesized in aqueous dispersion under different conditions. J Microencapsul 2015; 32:336-48. [DOI: 10.3109/02652048.2015.1028493] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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99954
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Preparation and characterization of polyaniline-poly(styrene-acrylate) composite latexes. Polym Bull (Berl) 2015. [DOI: 10.1007/s00289-015-1415-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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99955
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Kibeche A, Dionne A, Brion-Roby R, Gagnon C, Gagnon J. Simple and green technique for sequestration and concentration of silver nanoparticles by polysaccharides immobilized on glass beads in aqueous media. Chem Cent J 2015; 9:34. [PMID: 26075020 PMCID: PMC4464050 DOI: 10.1186/s13065-015-0110-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Accepted: 05/26/2015] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Engineered nanoparticles have unique properties compared to bulk materials and their commercial uses growing rapidly. They represent a potential risk for environment and health and could be eventually released in water. Silver nanoparticles (Ag NP) are applied in various products and are well-known for their antibacterial properties. Nowadays, pre-concentration and separation methods for Ag NP possess some limitations. Here, we present a simple, green method to sequestrate and concentrate Ag NP from different aqueous media. RESULTS Supported polysaccharides on glass beads synthesized in water by a single step reaction show high sequestration capacity of citrate-coated Ag NP in aqueous media. Supported polysaccharides were characterized by infrared spectroscopy, scanning electron microscopy (SEM) and elemental analysis. Sequestration of 83.0 % of Ag NP was attained from a 20 μg.L(-1) aqueous solution with supported chitosan in water whereas supported 2-hydroxyethylcellulose (HEC) reached 64.0 % in synthetic seawater in 2 h. The influence of polymer/glass beads ratio and molecular weight of polysaccharides was also studied. The effect of the salinity and humic acids on sequestration of Ag NP was investigated. Supported polymers have shown high performance for sequestration of ionic silver. Sequestration of 82.5 % and 80.8 % were obtained from a 60 μg.L(-1) silver ion (as nitrate salt) with supported HEC and chitosan, respectively. Sequestrated Ag NP was characterized with transmission electron microscopy (TEM) where images showed Ag NP with unchanged size and shape. CONCLUSIONS This sequestration method, involving green synthesis, allows efficient concentration and characterization of Ag NP from different aqueous media. This simple and fast method is a potential sustainable technique for elimination of Ag NP and ionic silver from waste waters and waters at different salinities.
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Affiliation(s)
- Alaeddine Kibeche
- Département de Biologie, chimie et géographie, Université du Québec à Rimouski, 300 allée des Ursulines, Rimouski, QC G5L 3A1 Canada
| | - Alexandre Dionne
- Département de Biologie, chimie et géographie, Université du Québec à Rimouski, 300 allée des Ursulines, Rimouski, QC G5L 3A1 Canada
| | - Roxanne Brion-Roby
- Département de Biologie, chimie et géographie, Université du Québec à Rimouski, 300 allée des Ursulines, Rimouski, QC G5L 3A1 Canada
| | - Christian Gagnon
- Centre Saint-Laurent, Environment Canada, 105 McGill st., 7th floor, Montreal, QC H2Y 2E7 Canada
| | - Jonathan Gagnon
- Département de Biologie, chimie et géographie, Université du Québec à Rimouski, 300 allée des Ursulines, Rimouski, QC G5L 3A1 Canada
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99956
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Mandal J, Ramakrishnan S. Periodically Grafted Amphiphilic Copolymers: Effects of Steric Crowding and Reversal of Amphiphilicity. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6035-6044. [PMID: 25984651 DOI: 10.1021/acs.langmuir.5b01227] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Two series of periodically clickable polyesters were prepared; one of them carries alkylene segments along its backbone, whereas the other carries poly(ethylene glycol) (PEG) segments. These polyesters were clicked with either MPEG-350 azide or docosyl (C22) azide to yield periodically grafted amphiphilic copolymers (PGACs) carrying either flexible hydrophilic or crystallizable hydrophobic backbone segments. The immiscibility between hydrocarbon and PEG segments causes both of these systems to fold in either a zigzag or hairpin-like conformation; the hairpin-like conformation appears to be preferred when flexible PEG segments are present in the backbone. The folded chains further reorganize in the solid state to develop a lamellar morphology that permits the collocation of the PEG and hydrocarbon (HC) segments within alternate domains; evidence for the self-segregation was gained from DSC, SAXS, and AFM studies. SAXS studies revealed the formation of an extended lamellar structure, whereas AFM images showed uniform layered morphology with layer heights that matched reasonably well with the interlamellar spacing obtained from the SAXS study. Labeling one representative PGAC, carrying crystallizable long alkylene segments in the backbone and pendant PEG-350 side chains, with a small mole fraction of pyrene fluorophore permitted the examination of the conformational transition that occurs upon going from a good to a poor solvent; this single-chain folded conformation, we postulate, is the intermediate that organizes into the lamellar morphology.
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Affiliation(s)
- Joydeb Mandal
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
| | - S Ramakrishnan
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India
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99957
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Kim B, Jeon TY, Oh YK, Kim SH. Microfluidic Production of Semipermeable Microcapsules by Polymerization-Induced Phase Separation. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6027-6034. [PMID: 26020458 DOI: 10.1021/acs.langmuir.5b01129] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Semipermeable microcapsules are appealing for controlled release of drugs, study of cell-to-cell communication, and isolation of enzymes or artificial catalysts. Here, we report a microfluidic strategy for creating monodisperse microcapsules with size-selective permeability using polymerization-induced phase separation. Monodisperse water-in-oil-in-water (W/O/W) double-emulsion drops, whose ultrathin middle layer is composed of photocurable resin and inert oil, are generated in a capillary microfluidic device, and irradiated by UV light. Upon UV illumination, the monomers are photopolymerized, which leads to phase separation between the polymerized resin and the oil within the ultrathin shell. Subsequent dissolution of the oil leaves behind regular pores in the polymerized membrane that interconnect the interior and exterior of the microcapsules, thereby providing size-selective permeability. The degree of phase separation can be further tuned by adjusting the fraction of oil in the shell or the affinity of the oil to the monomers, thereby enabling the control of the cutoff value of permeation. High mechanical stability and chemical resistance of the microcapsules, as well as controllable permeability and high encapsulation efficiency, will provide new opportunity in a wide range of applications.
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Affiliation(s)
- Bomi Kim
- †Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 305-701, Republic of Korea
| | - Tae Yoon Jeon
- †Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 305-701, Republic of Korea
| | - You-Kwan Oh
- ‡Biomass and Waste Energy Laboratory, Korea Institute of Energy Research (KIER), Daejeon, 305-343, Republic of Korea
| | - Shin-Hyun Kim
- †Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, 305-701, Republic of Korea
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99958
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Yusop AHM, Daud NM, Nur H, Kadir MRA, Hermawan H. Controlling the degradation kinetics of porous iron by poly(lactic-co-glycolic acid) infiltration for use as temporary medical implants. Sci Rep 2015; 5:11194. [PMID: 26057073 PMCID: PMC4460907 DOI: 10.1038/srep11194] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Accepted: 05/15/2015] [Indexed: 11/09/2022] Open
Abstract
Iron and its alloy have been proposed as biodegradable metals for temporary medical implants. However, the formation of iron oxide and iron phosphate on their surface slows down their degradation kinetics in both in vitro and in vivo scenarios. This work presents new approach to tailor degradation behavior of iron by incorporating biodegradable polymers into the metal. Porous pure iron (PPI) was vacuum infiltrated by poly(lactic-co-glycolic acid) (PLGA) to form fully dense PLGA-infiltrated porous iron (PIPI) and dip coated into the PLGA to form partially dense PLGA-coated porous iron (PCPI). Results showed that compressive strength and toughness of the PIPI and PCPI were higher compared to PPI. A strong interfacial interaction was developed between the PLGA layer and the iron surface. Degradation rate of PIPI and PCPI was higher than that of PPI due to the effect of PLGA hydrolysis. The fast degradation of PIPI did not affect the viability of human fibroblast cells. Finally, this work discusses a degradation mechanism for PIPI and the effect of PLGA incorporation in accelerating the degradation of iron.
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Affiliation(s)
- Abdul Hakim Md Yusop
- Medical Devices Technology Group (MediTeg), Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, Johor Bahru, 81310, Malaysia
| | - Nurizzati Mohd Daud
- Medical Devices Technology Group (MediTeg), Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, Johor Bahru, 81310, Malaysia
| | - Hadi Nur
- Center for Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, Johor Bahru, 81310, Malaysia
| | - Mohammed Rafiq Abdul Kadir
- Medical Devices Technology Group (MediTeg), Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, Johor Bahru, 81310, Malaysia
| | - Hendra Hermawan
- Medical Devices Technology Group (MediTeg), Faculty of Biosciences and Medical Engineering, Universiti Teknologi Malaysia, Johor Bahru, 81310, Malaysia
- Dept. of Mining, Metallurgical and Materials Engineering & CHU de Québec Research Center, Laval University, Quebec City, G1V 0A6, Canada
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99959
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Chu F, Heptner N, Lu Y, Siebenbürger M, Lindner P, Dzubiella J, Ballauff M. Colloidal Plastic Crystals in a Shear Field. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:5992-6000. [PMID: 25635343 DOI: 10.1021/la504932p] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We study the structure and viscoelastic behavior of 3D plastic crystals of colloidal dumbbells in an oscillatory shear field based on a combination of small-angle neutron scattering experiments under shear (rheo-SANS) and Brownian dynamics computer simulations. Sterically stabilized dumbbell-shaped microgels are used as hard dumbbell model systems which consist of dumbbell-shaped polystyrene (PS) cores and thermosensitive poly(N-isopropylacrylamide) (PNIPAM) shells. Under increasing shear strain, a discontinuous transition is found from a twinned-fcc-like crystal to a partially oriented sliding-layer phase with a shear-molten state in between. In the novel partially oriented sliding-layer phase, the hard dumbbells exhibit a small but finite orientational order in the shear direction. We find that this weak correlation is sufficient to perturb the nature of the nonequilibrium phase transition as known for hard sphere systems. The discontinuous transition for hard dumbbells is observed to be accompanied by a novel yielding process with two yielding events in its viscoelastic shear response, while only a single yielding event is observed for sheared hard spheres. Our findings will be useful in interpreting the shear response of anisotropic colloidal systems and in generating novel colloidal crystals from anisotropic systems with applications in colloidal photonics.
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Affiliation(s)
- Fangfang Chu
- †Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, D-12489 Berlin, Germany
- ‡Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin, Hahn-Meitner Platz 1, D-14109 Berlin, Germany
| | - Nils Heptner
- †Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, D-12489 Berlin, Germany
- ‡Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin, Hahn-Meitner Platz 1, D-14109 Berlin, Germany
| | - Yan Lu
- ‡Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin, Hahn-Meitner Platz 1, D-14109 Berlin, Germany
| | - Miriam Siebenbürger
- ‡Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin, Hahn-Meitner Platz 1, D-14109 Berlin, Germany
| | - Peter Lindner
- §Institut Laue-Langevin, 71 avenue des Martyrs - CS 20156 - 38042 Grenoble Cedex 9, France
| | - Joachim Dzubiella
- †Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, D-12489 Berlin, Germany
- ‡Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin, Hahn-Meitner Platz 1, D-14109 Berlin, Germany
| | - Matthias Ballauff
- †Institut für Physik, Humboldt-Universität zu Berlin, Newtonstr. 15, D-12489 Berlin, Germany
- ‡Soft Matter and Functional Materials, Helmholtz-Zentrum Berlin, Hahn-Meitner Platz 1, D-14109 Berlin, Germany
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99960
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Bacterial cellulose in the field of wound healing and regenerative medicine of skin: recent trends and future prospectives. Polym Bull (Berl) 2015. [DOI: 10.1007/s00289-015-1407-3] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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99961
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Yang S, Yu H, Lei F, Li J, Guo S, Wu H, Shen J, Xiong Y, Chen R. Formation Mechanism and Morphology of β-Transcrystallinity of Polypropylene Induced by Two-Dimensional Layered Interface. Macromolecules 2015. [DOI: 10.1021/acs.macromol.5b00396] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shuo Yang
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, Sichuan 610065, China
| | - Huaning Yu
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, Sichuan 610065, China
| | - Fan Lei
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, Sichuan 610065, China
| | - Jiang Li
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, Sichuan 610065, China
| | - Shaoyun Guo
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, Sichuan 610065, China
| | - Hong Wu
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, Sichuan 610065, China
| | - Jiabin Shen
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, Sichuan 610065, China
| | - Ying Xiong
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, Sichuan 610065, China
| | - Rong Chen
- The State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute of Sichuan University, Chengdu, Sichuan 610065, China
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99962
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Lo CW, Liao WH, Wu CH, Lee JL, Sun MK, Yang HS, Tsai WB, Chang Y, Chen WS. Synergistic Effect of PEI and PDMAEMA on Transgene Expression in Vitro. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6130-6136. [PMID: 25985827 DOI: 10.1021/acs.langmuir.5b00520] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Polyethylenimine (PEI) and poly(2-(dimethylamino) ethyl methacrylate) (PDMAEMA) have both been used for DNA delivery. PDMAEMA has been shown to exhibit better gene transfection efficiency but lower expression ability than PEI. We mixed the two polymers at different ratios to investigate whether the resulting "dual" polyplex (PEI/PDMAEMA/DNA) could enhance both gene transfection efficiency and DNA expression ability. Experimental results showed a significant increase in DNA internalization and DNA expression for the PDMAEMA/PEI/DNA polyplexes at a ratio of 1:3 or 1:9 (PDMAEMA: PEI), depending on cell type, in comparison with PEI/DNA, PDMAEMA/DNA, and PDMAEMA/PEI/DNA at other ratios. PDMAEMA/PEI/DNA polyplexes did not reduce cell viability. In contrast to with the conventional approach using covalently modified PEI, the proposed "combination" approach provided a more convenient and effective way to improve transgene expression efficiency.
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Affiliation(s)
- Chia-Wen Lo
- †Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan ROC
| | - Wei-Hao Liao
- †Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan ROC
| | - Chueh-Hung Wu
- †Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan ROC
- ‡Institute of Biomedical Engineering, College of Medicine and College of Engineering, National Taiwan University, Taipei, Taiwan ROC
| | - Jyun-Lin Lee
- †Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan ROC
| | - Ming-Kuan Sun
- ⊥Division of Medical Engineering Research, National Health Research Institutes, Miaoli, Taiwan
| | | | - Wei-Bor Tsai
- §Department of Chemical Engineering, National Taiwan University, Taipei, Taiwan ROC
| | | | - Wen-Shiang Chen
- †Department of Physical Medicine and Rehabilitation, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan ROC
- ⊥Division of Medical Engineering Research, National Health Research Institutes, Miaoli, Taiwan
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99963
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One pot fabrication of optically active and efficient antibacterial poly(amide-benzimidazole-imide)/Ag bionanocomposite. JOURNAL OF POLYMER RESEARCH 2015. [DOI: 10.1007/s10965-015-0743-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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99964
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Nagatani H, Sakae H, Torikai T, Sagara T, Imura H. Photoinduced Electron Transfer of PAMAM Dendrimer-Zinc(II) Porphyrin Associates at Polarized Liquid|Liquid Interfaces. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2015; 31:6237-6244. [PMID: 25989445 DOI: 10.1021/acs.langmuir.5b01165] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The heterogeneous photoinduced electron-transfer reaction of the ion associates between NH2-terminated polyamidoamine (PAMAM) dendrimers and 5,10,15,20-tetrakis(4-sulfonatophenyl)porphyrinato zinc(II) (ZnTPPS(4-)) was studied at the polarized water|1,2-dichloroethane (DCE) interface. The positive photocurrent arising from the photoreduction of ZnTPPS(4-) by a lipophilic quencher, decamethylferrocene, in the interfacial region was significantly enhanced by the ion association with the PAMAM dendrimers. The photocurrent response of the dendrimer-ZnTPPS(4-) associates was dependent on the pH condition and on the generation of dendrimer. A few cationic additives such as polyallylamine and n-octyltrimethyammonium were also examined as alternatives to the PAMAM dendrimer, but the magnitude of the photocurrent enhancement was rather small. The high photoreactivity of the dendrimer-ZnTPPS(4-) associates was interpreted mainly as a result of the high interfacial concentration of photoreactive porphyrin units associated stably with the dendrimer which was preferably adsorbed at the polarized water|DCE interface. The photochemical data observed in the second and fourth generation PAMAM dendrimer systems demonstrated that the higher generation dendrimer which can incorporate a porphyrin molecule more completely in the interior is less efficient for the photocurrent enhancement at the interface. These results indicated that the photoreactivity of ionic reactant at a polarized liquid|liquid interface can readily be modified via ion association with the charged dendrimer.
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Affiliation(s)
- Hirohisa Nagatani
- †Faculty of Chemistry, Institute of Science and Engineering and ‡Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
- §Department of Materials Engineering and Molecular Science, Graduate School of Science and Technology and ∥Division of Chemistry and Materials Science, Graduate School of Engineering, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan
| | - Hiroki Sakae
- †Faculty of Chemistry, Institute of Science and Engineering and ‡Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
- §Department of Materials Engineering and Molecular Science, Graduate School of Science and Technology and ∥Division of Chemistry and Materials Science, Graduate School of Engineering, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan
| | - Taishi Torikai
- †Faculty of Chemistry, Institute of Science and Engineering and ‡Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
- §Department of Materials Engineering and Molecular Science, Graduate School of Science and Technology and ∥Division of Chemistry and Materials Science, Graduate School of Engineering, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan
| | - Takamasa Sagara
- †Faculty of Chemistry, Institute of Science and Engineering and ‡Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
- §Department of Materials Engineering and Molecular Science, Graduate School of Science and Technology and ∥Division of Chemistry and Materials Science, Graduate School of Engineering, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan
| | - Hisanori Imura
- †Faculty of Chemistry, Institute of Science and Engineering and ‡Division of Material Sciences, Graduate School of Natural Science and Technology, Kanazawa University, Kakuma, Kanazawa 920-1192, Japan
- §Department of Materials Engineering and Molecular Science, Graduate School of Science and Technology and ∥Division of Chemistry and Materials Science, Graduate School of Engineering, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan
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99965
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Chng LL, Yang J, Ying JY. Efficient Synthesis of Amides and Esters from Alcohols under Aerobic Ambient Conditions Catalyzed by a Au/Mesoporous Al2 O3 Nanocatalyst. CHEMSUSCHEM 2015; 8:1916-25. [PMID: 25925279 DOI: 10.1002/cssc.201403469] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2014] [Revised: 03/11/2015] [Indexed: 05/21/2023]
Abstract
An efficient heterogeneous Au/mesoporous alumina nanocatalyst has been successfully developed for the synthesis of amides and esters from simple building blocks of readily available alcohols and amines. The processes were simple and were performed at room temperature and atmospheric pressure of O2 to form the desired products with up to 97 % isolated yield. The ability of Au/mesoporous alumina to catalyze these reactions under ambient conditions further enhances the sustainability of these chemical processes. Furthermore, the nanocatalyst was stable to air and water and could be recovered and reused easily. The enhanced catalytic activity of Au/mesoporous alumina might be attributed to the presence of negatively charged Au nanoparticles that could promote oxidation processes as well as the stability of the mesoporous alumina support calcined at a high temperature of 800 °C.
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Affiliation(s)
- Leng Leng Chng
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, The Nanos, Singapore 138669 (Singapore)
| | - Jinhua Yang
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, The Nanos, Singapore 138669 (Singapore)
| | - Jackie Y Ying
- Institute of Bioengineering and Nanotechnology, 31 Biopolis Way, The Nanos, Singapore 138669 (Singapore).
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99966
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Wang J, Li B, Jin Q, Huang X, Shen J, Kan C. Preparation of covalently colored polymer latex through miniemulsion polymerization based on a polymerizable dye. Des Monomers Polym 2015. [DOI: 10.1080/15685551.2015.1045228] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Affiliation(s)
- Jishuai Wang
- Department of Chemical Engineering and Laboratory of Advanced Materials of Ministry of Education, Tsinghua University, Beijing 100084, P.R. China
| | - Botian Li
- Department of Chemical Engineering and Laboratory of Advanced Materials of Ministry of Education, Tsinghua University, Beijing 100084, P.R. China
| | - Qingjun Jin
- Department of Chemical Engineering and Laboratory of Advanced Materials of Ministry of Education, Tsinghua University, Beijing 100084, P.R. China
| | - Xinyi Huang
- Department of Chemical Engineering and Laboratory of Advanced Materials of Ministry of Education, Tsinghua University, Beijing 100084, P.R. China
| | - Jie Shen
- Department of Chemical Engineering and Laboratory of Advanced Materials of Ministry of Education, Tsinghua University, Beijing 100084, P.R. China
| | - Chengyou Kan
- Department of Chemical Engineering and Laboratory of Advanced Materials of Ministry of Education, Tsinghua University, Beijing 100084, P.R. China
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99967
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Sabbatier G, Larrañaga A, Guay-Bégin AA, Fernandez J, Diéval F, Durand B, Sarasua JR, Laroche G. Design, Degradation Mechanism and Long-Term Cytotoxicity of Poly(l-lactide) and Poly(Lactide-co-ϵ-Caprolactone) Terpolymer Film and Air-Spun Nanofiber Scaffold. Macromol Biosci 2015; 15:1392-410. [DOI: 10.1002/mabi.201500130] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Revised: 05/14/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Gad Sabbatier
- Laboratoire d'Ingénierie de Surface, Centre de Recherche sur les Matériaux Avancés, Département de génie des mines, de la métallurgie et des matériaux; Université Laval; 1065, avenue de la Médecine Québec City Canada G1V 0A6
- Axe Médecine Régénératrice, Centre de recherche du CHU de Québec; Hôpital St François d'Assise; 10, rue de l'Espinay Québec City Canada G1L 3L5
- Laboratoire de Physique et Mécanique Textile, Université de Haute Alsace; École Nationale Supérieure d'Ingénieurs du Sud Alsace; 11 rue Alfred Werner 68093 Mulhouse Cedex France
| | - Aitor Larrañaga
- Department of Mining-Metallurgy Engineering and Materials Science, School of Engineering; University of the Basque Country (UPV/EHU); Alameda de Urquijo s/n 48013 Bilbao Spain
| | - Andrée-Anne Guay-Bégin
- Axe Médecine Régénératrice, Centre de recherche du CHU de Québec; Hôpital St François d'Assise; 10, rue de l'Espinay Québec City Canada G1L 3L5
| | - Jorge Fernandez
- Department of Mining-Metallurgy Engineering and Materials Science, School of Engineering; University of the Basque Country (UPV/EHU); Alameda de Urquijo s/n 48013 Bilbao Spain
| | - Florence Diéval
- Laboratoire de Physique et Mécanique Textile, Université de Haute Alsace; École Nationale Supérieure d'Ingénieurs du Sud Alsace; 11 rue Alfred Werner 68093 Mulhouse Cedex France
| | - Bernard Durand
- Laboratoire de Physique et Mécanique Textile, Université de Haute Alsace; École Nationale Supérieure d'Ingénieurs du Sud Alsace; 11 rue Alfred Werner 68093 Mulhouse Cedex France
| | - Jose-Ramon Sarasua
- Department of Mining-Metallurgy Engineering and Materials Science, School of Engineering; University of the Basque Country (UPV/EHU); Alameda de Urquijo s/n 48013 Bilbao Spain
| | - Gaétan Laroche
- Laboratoire d'Ingénierie de Surface, Centre de Recherche sur les Matériaux Avancés, Département de génie des mines, de la métallurgie et des matériaux; Université Laval; 1065, avenue de la Médecine Québec City Canada G1V 0A6
- Axe Médecine Régénératrice, Centre de recherche du CHU de Québec; Hôpital St François d'Assise; 10, rue de l'Espinay Québec City Canada G1L 3L5
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99968
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Wawrzyńska E, Sikorski A, Zifferer G. Monte Carlo Simulation Studies of Regular and Irregular Dendritic Polymers. MACROMOL THEOR SIMUL 2015. [DOI: 10.1002/mats.201500036] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Edyta Wawrzyńska
- Department of Physical Chemistry; University of Vienna; Währinger Str. 42 A-1090 Vienna Austria
- Faculty of Chemistry; Warsaw University of Technology; Noakowskiego 3 00-664 Warsaw Poland
- Faculty of Chemistry; University of Warsaw; Pasteura 1 02-093 Warsaw Poland
| | - Andrzej Sikorski
- Faculty of Chemistry; University of Warsaw; Pasteura 1 02-093 Warsaw Poland
| | - Gerhard Zifferer
- Department of Physical Chemistry; University of Vienna; Währinger Str. 42 A-1090 Vienna Austria
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99969
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Preparation of reactive fibre interfaces using multifunctional cellulose derivatives. Carbohydr Polym 2015; 132:261-73. [PMID: 26256349 DOI: 10.1016/j.carbpol.2015.05.048] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 05/18/2015] [Accepted: 05/20/2015] [Indexed: 11/20/2022]
Abstract
Cellulose fibres have poor reactivity and limited potential for surface engineering with advanced chemical functionalization in water. In this work, cellulose fibres were decorated with azide functions by charge-directed self-assembly of a novel water-soluble multifunctional cellulose derivative yielding reactive fibres. Propargylamine and 1-ethynylpyrene were utilized as a proof of concept that alkyne molecules may react with the azide functions of the reactive fibres via copper(I)-catalyzed azide-alkyne Huisgen cycloaddition (CuAAc) reaction in mild conditions. Chemical characterization of the fibres was carried out using classical techniques such as Raman-, fluorescence-, and UV-vis spectroscopy. Among other techniques, time-of-flight secondary ion mass spectrometry (ToF-SIMS), X-ray spectroscopy (XPS), two-photon microscopy (TPM), and inductively coupled plasma mass spectrometry (ICP-MS) were useful tools for additional characterization of the fibres decorated with amino- or photoactive groups. The information gathered in this work might contribute to the basis for the preparation of reactive cellulose-based interfaces with potential application in CuAAc reactions.
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99970
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Karmel ISR, Fridman N, Tamm M, Eisen MS. Mixed Imidazolin-2-iminato–Cp* Thorium(IV) Complexes: Synthesis and Reactivity Toward Oxygen-Containing Substrates. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00273] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Isabell S. R. Karmel
- Schulich
Faculty of Chemistry, Institute of Catalysis Science and Technology, Technion − Israel Institute of Technology, Technion City, Haifa, 32000 Israel
| | - Natalia Fridman
- Schulich
Faculty of Chemistry, Institute of Catalysis Science and Technology, Technion − Israel Institute of Technology, Technion City, Haifa, 32000 Israel
| | - Matthias Tamm
- Institut
für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Moris S. Eisen
- Schulich
Faculty of Chemistry, Institute of Catalysis Science and Technology, Technion − Israel Institute of Technology, Technion City, Haifa, 32000 Israel
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99971
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Zhang K, Geissler A, Standhardt M, Mehlhase S, Gallei M, Chen L, Marie Thiele C. Moisture-responsive films of cellulose stearoyl esters showing reversible shape transitions. Sci Rep 2015; 5:11011. [PMID: 26051984 PMCID: PMC4458881 DOI: 10.1038/srep11011] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Accepted: 05/11/2015] [Indexed: 12/21/2022] Open
Abstract
Moisture-responsive materials are gaining greater interest for their potentially wide applications and the readily access to moisture. In this study, we show the fabrication of moisture-responsive, self-standing films using sustainable cellulose as starting material. Cellulose was modified by stearoyl moieties at first, leading to cellulose stearoyl esters (CSEs) with diverse degrees of substitution (DSs). The films of CSE with a low DS of 0.3 (CSE0.3) exhibited moisture-responsive properties, while CSEs with higher DSs of 1.3 or 3 (CSE1.3 and CSE3) not. The CSE0.3 films could reversibly fold and unfold as rhythmical bending motions within a local moisture gradient due to the ab- and desorption of water molecules at the film surface. By spray-coating CSE3 nanoparticles (NPs) onto CSE0.3 films, moisture-responsive films with non-wetting surface were obtained, which can perform quick reversible bending movements and continuous shape transition on water. Furthermore, bilayer films containing one layer of CSE0.3 at one side and one layer of CSE3 at the other side exhibited combined responsiveness to moisture and temperature. By varying the thickness of CSE0.3 films, the minimal bending extent can be adjusted due to altered mechanical resistances, which allows a bending movement preferentially beginning with the thinner side.
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Affiliation(s)
- Kai Zhang
- Ernst-Berl-Institute for Chemical Engineering and Macromolecular Science, Technische Universität Darmstadt, Alarich-Weiss-Str. 8, D-64287 Darmstadt, Germany
| | - Andreas Geissler
- Ernst-Berl-Institute for Chemical Engineering and Macromolecular Science, Technische Universität Darmstadt, Alarich-Weiss-Str. 8, D-64287 Darmstadt, Germany
| | - Michaela Standhardt
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Alarich-Weiss-Str. 16, D-64287 Darmstadt, Germany
| | - Sabrina Mehlhase
- Ernst-Berl-Institute for Chemical Engineering and Macromolecular Science, Technische Universität Darmstadt, Alarich-Weiss-Str. 8, D-64287 Darmstadt, Germany
| | - Markus Gallei
- Ernst-Berl-Institute for Chemical Engineering and Macromolecular Science, Technische Universität Darmstadt, Alarich-Weiss-Str. 8, D-64287 Darmstadt, Germany
| | - Longquan Chen
- School of Mechanics and Engineering, Southwest Jiaotong University, 610031, Chengdu Chine
| | - Christina Marie Thiele
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie, Technische Universität Darmstadt, Alarich-Weiss-Str. 16, D-64287 Darmstadt, Germany
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99972
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Jiang Z, Yi J, Li J, He T, Hu C. Promoting Effect of Sodium Chloride on the Solubilization and Depolymerization of Cellulose from Raw Biomass Materials in Water. CHEMSUSCHEM 2015; 8:1901-1907. [PMID: 25916895 DOI: 10.1002/cssc.201500158] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Indexed: 06/04/2023]
Abstract
The development of a green system to solubilize cellulose from raw biomass is important, yet it is challenging because of the insolubility of cellulose in most solvents. Herein, a green NaCl-H2 O system is developed in which NaCl significantly enhances the dissolution and depolymerisation of cellulose from raw biomass. Nearly all the cellulose in the selected biomass types was dissolved and degraded into oligomers with molecular weights of 200-400 Da under relatively mild conditions. Cl(-) could interact strongly with the end OH group of the glucose unit in a 1:1 ratio, which resulted in the enhanced breaking of both inter- and intramolecular hydrogen bonds. In particular, the intermolecular hydrogen bond with an FTIR band at approximately v=3200 cm(-1) was disrupted significantly by Cl(-) . The FTIR band for a hydrogen bond between hemicellulose and lignin might appear at v=1636 cm(-1) , whereas this bond could be almost totally broken under hydrothermal conditions at 220 °C.
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Affiliation(s)
- Zhicheng Jiang
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan, 610064 (PR China), Fax: (+86) 28-85411105
| | - Jian Yi
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan, 610064 (PR China), Fax: (+86) 28-85411105
| | - Jianmei Li
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan, 610064 (PR China), Fax: (+86) 28-85411105.
| | - Ting He
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan, 610064 (PR China), Fax: (+86) 28-85411105
| | - Changwei Hu
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, Sichuan, 610064 (PR China), Fax: (+86) 28-85411105.
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99973
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Zhang F, Zhou T, Liu Y, Leng J. Microwave synthesis and actuation of shape memory polycaprolactone foams with high speed. Sci Rep 2015; 5:11152. [PMID: 26053586 PMCID: PMC4459203 DOI: 10.1038/srep11152] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 05/15/2015] [Indexed: 11/09/2022] Open
Abstract
Microwave technology is a highly effective approach to fast and uniform heating. This article investigates that the microwave heating as a novel method is used to rapidly foam and actuate biocompatible and biodegradable shape memory crosslinked-polycaprolactone (c-PCL) foams. The optical microscope proves that the resulting c-PCL foams have homogenous pore structure. Mechanical behavior and shape memory performance of c-PCL foams are investigated by static materials testing. Shape recovery ratio is approximately 100% and the whole recovery process takes only 98 s when trigged by microwave. Due to the unique principle of microwave heating, the recovery speed of c-PCL foams in microwave oven is several times faster than that in hot water and electric oven. Hence compared to the traditional heating methods, microwave is expected to bring more advantages to modern industry and scientific research in the field of smart materials and structures.
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Affiliation(s)
- Fenghua Zhang
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin 150080, P. R. China
| | - Tianyang Zhou
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin 150080, P. R. China
| | - Yanju Liu
- Department of Astronautical Science and Mechanics, Harbin Institute of Technology (HIT), Harbin 150001, P. R. China
| | - Jinsong Leng
- Centre for Composite Materials and Structures, Harbin Institute of Technology (HIT), Harbin 150080, P. R. China
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99974
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Grobelny Z, Matlengiewicz M, Skrzeczyna K, Swinarew A, Golba S, Jurek-Suliga J, Michalak M, Swinarew B. Ring-Opening Polymerization of Lactones Initiated with Metal Hydroxide-Activated Macrocyclic Ligands: Determination of Mechanism and Structure of Polymers. INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION 2015. [DOI: 10.1080/1023666x.2015.1036219] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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99975
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A novel capsule-based self-recovery system with a chloride ion trigger. Sci Rep 2015; 5:10866. [PMID: 26051224 PMCID: PMC4458884 DOI: 10.1038/srep10866] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 04/27/2015] [Indexed: 01/24/2023] Open
Abstract
Steel is prone to corrosion induced by chloride ions, which is a serious threat to reinforced concrete structures, especially in marine environments. In this work, we report a novel capsule-based self-recovery system that utilizes chloride ions as a trigger. These capsules, which are functionalized via a smart response to chloride ions, are fabricated using a silver alginate hydrogel that disintegrates upon contact with chloride ions, and thereby releases the activated core materials. The experimental results show that the smart capsules respond to a very low concentration of chloride ions (0.1 wt%). Therefore, we believe that this novel capsule-based self-recovery system will exhibit a promising prospect for self-healing or corrosion inhibition applications.
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99976
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Verduzco R, Li X, Pesek SL, Stein GE. Structure, function, self-assembly, and applications of bottlebrush copolymers. Chem Soc Rev 2015; 44:2405-20. [PMID: 25688538 DOI: 10.1039/c4cs00329b] [Citation(s) in RCA: 430] [Impact Index Per Article: 47.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Bottlebrush polymers are a type of branched or graft polymer with polymeric side-chains attached to a linear backbone, and the unusual architectures of bottlebrushes provide a number of unique and potentially useful properties. These include a high entanglement molecular weight, enabling rapid self-assembly of bottlebrush block copolymers into large domain structures, the self-assembly of bottlebrush block copolymer micelles in a selective solvent even at very low dilutions, and the functionalization of bottlebrush side-chains for recognition, imaging, or drug delivery in aqueous environments. This review article focuses on recent developments in the field of bottlebrush polymers with an emphasis on applications of bottlebrush copolymers. Bottlebrush copolymers contain two (or more) different types of polymeric side-chains. Recent work has explored the diverse properties and functions of bottlebrush polymers and copolymers in solutions, films, and melts, and applications explored include photonic materials, bottlebrush films for lithographic patterning, drug delivery, and tumor detection and imaging. We provide a brief introduction to bottlebrush synthesis and physical properties and then discuss work related to: (i) bottlebrush self-assembly in melts and bulk thin films, (ii) bottlebrushes for photonics and lithography, (iii) bottlebrushes for small molecule encapsulation and delivery in solution, and (iv) bottlebrush micelles and assemblies in solution. We briefly discuss three potential areas for future research, including developing a more quantitative model of bottlebrush self-assembly in the bulk, studying the properties of bottlebrushes at interfaces, and investigating the solution assembly of bottlebrush copolymers.
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Affiliation(s)
- Rafael Verduzco
- Department of Chemical and Biomolecular Engineering, William Marsh Rice University, 6100 Main Street, MS-362, Houston, TX 77005, USA.
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99977
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Oh SY, Kang MS, Knowles JC, Gong MS. Synthesis of bio-based thermoplastic polyurethane elastomers containing isosorbide and polycarbonate diol and their biocompatible properties. J Biomater Appl 2015; 30:327-37. [DOI: 10.1177/0885328215590054] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A new family of highly elastic polyurethanes (PUs) partially based on renewable isosorbide were prepared by reacting hexamethylene diisocyanate with a various ratios of isosorbide and polycarbonate diol 2000 (PCD) via a one-step bulk condensation polymerization without catalyst. The influence of the isorsorbide/PCD ratio on the properties of the PU was evaluated. The successful synthesis of the PUs was confirmed by Fourier transform-infrared spectroscopy and 1H nuclear magnetic resonance. The resulting PUs showed high number-average molecular weights ranging from 56,320 to 126,000 g mol−1 and tunable Tg values from −34 to −38℃. The thermal properties were determined by differential scanning calorimetry and thermogravimetric analysis. The PU films were flexible with breaking strains from 955% to 1795% at from 13.5 to 54.2 MPa tensile stress. All the PUs had 0.9–2.8% weight lost over 4 weeks and continual slow weight loss of 1.1–3.6% was observed within 8 weeks. Although the cells showed a slight lower rate of proliferation than that of the tissue culture polystyrene as a control, the PU films were considered to be cytocompatible and nontoxic. These thermoplastic PUs were soft, flexible and biocompatible polymers, which open up a range of opportunities for soft tissue augmentation and regeneration.
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Affiliation(s)
- So-Yeon Oh
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center, Dankook University Graduate School, Chungnam, South Korea
| | - Min-Sil Kang
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center, Dankook University Graduate School, Chungnam, South Korea
| | - Jonathan C Knowles
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center, Dankook University Graduate School, Chungnam, South Korea
- Division of Biomaterials and Tissue Engineering, UCL Eastman Dental Institute, University College London, London, UK
| | - Myoung-Seon Gong
- Department of Nanobiomedical Science and BK21 PLUS NBM Global Research Center, Dankook University Graduate School, Chungnam, South Korea
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99978
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Highly Sulfonated Diamine Synthesized Polyimides and Protic Ionic Liquid Composite Membranes Improve PEM Conductivity. Polymers (Basel) 2015. [DOI: 10.3390/polym7061046] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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99979
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Hasenaka Y, Okamura TA, Tatsumi M, Inazumi N, Onitsuka K. Behavior of anionic molybdenum(IV, VI) and tungsten(IV, VI) complexes containing bulky hydrophobic dithiolate ligands and intramolecular NH···S hydrogen bonds in nonpolar solvents. Dalton Trans 2015; 43:15491-502. [PMID: 25190301 DOI: 10.1039/c4dt01646g] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molybdenum(IV, VI) and tungsten(IV, VI) complexes, (Et4N)2[M(IV)O{1,2-S2-3,6-(RCONH)2C6H2}2] and (Et4N)2[M(VI)O2{1,2-S2-3,6-(RCONH)2C6H2}2] (M = Mo, W; R = (4-(t)BuC6H4)3C), with bulky hydrophobic dithiolate ligands containing NH···S hydrogen bonds were synthesized. These complexes are soluble in nonpolar solvents like toluene, which allows the detection of unsymmetrical coordination structures and elusive intermolecular interactions in solution. The (1)H NMR spectra of the complexes in toluene-d8 revealed an unsymmetrical coordination structure, and proximity of the counterions to the anion moiety was suggested at low temperatures. The oxygen-atom-transfer reaction between the molybdenum(IV) complex and Me3NO in toluene was considerably accelerated in nonpolar solvents, and this increase was attributed to the favorable access of the substrate to the active center in the hydrophobic environment.
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Affiliation(s)
- Yuki Hasenaka
- Department of Macromolecular Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan.
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99980
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Seoane B, Coronas J, Gascon I, Etxeberria Benavides M, Karvan O, Caro J, Kapteijn F, Gascon J. Metal-organic framework based mixed matrix membranes: a solution for highly efficient CO2 capture? Chem Soc Rev 2015; 44:2421-54. [PMID: 25692487 PMCID: PMC4445399 DOI: 10.1039/c4cs00437j] [Citation(s) in RCA: 478] [Impact Index Per Article: 53.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The field of metal-organic framework based mixed matrix membranes (M(4)s) is critically reviewed, with special emphasis on their application in CO2 capture during energy generation. After introducing the most relevant parameters affecting membrane performance, we define targets in terms of selectivity and productivity based on existing literature on process design for pre- and post-combustion CO2 capture. Subsequently, the state of the art in M(4)s is reviewed against these targets. Because final application of these membranes will only be possible if thin separation layers can be produced, the latest advances in the manufacture of M(4) hollow fibers are discussed. Finally, the recent efforts in understanding the separation performance of these complex composite materials and future research directions are outlined.
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Affiliation(s)
- Beatriz Seoane
- Catalysis Engineering, Chemical Engineering Department, Delft University of Technology, Julianalaan 131, 2628 BL Delft, The Netherlands.
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99981
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Yu S, Yuan J, Shi J, Ruan X, Wang Y, Gao S, Du Y. One-pot synthesis of water-soluble, β-cyclodextrin-based polyrotaxanes in a homogeneous water system and its use in bio-applications. J Mater Chem B 2015; 3:5277-5283. [PMID: 32262603 DOI: 10.1039/c5tb00627a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A small, nano-sized, water-soluble polyrotaxane (PR) was synthesized using a highly efficient one-pot synthesis strategy in a homogeneous water system, formed from β-cyclodextrin-(COOH)2, poly(propylene glycol)bis(2-aminopropyl ether) (PPG, 2 kDa) and a mono-(6-azido-6-desoxy)-β-cyclodextrin stopper via room temperature click chemistry. β-cyclodextrin-(COOH)2 and PR were characterized by one- and two-dimensional NMR as well as by high resolution transmission electron microscopy (HR-TEM). The number of carboxyl groups in one PR was determined by 1H NMR. Two-dimensional diffusion-ordered NMR spectroscopy (2D DOSY) and nuclear Overhauser enhancement spectroscopy (2D NOESY) show that β-cyclodextrin-(COOH)2 and PPG successfully formed an inclusion complex. HR-TEM revealed the morphology of water-soluble PR as a spherical nanoparticle with a size of approximately 3.5 nm ± 1.5 nm. PR was labeled with rhodamine to assess its biocompatibility and cell membrane penetrability in vitro. The in vivo real-time fluorescent imaging biodistribution experiments indicated that water-soluble PR can actively target tumor sites using an enhanced permeability and retention (EPR) effect, with a significantly prolonged blood circulation time in tumor-bearing mice.
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Affiliation(s)
- Shuling Yu
- Key Laboratory of Natural Medicine and Immune-Engineering of Henan Province, Henan University, Kaifeng, Henan 475004, P. R. China.
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99982
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Haraguchi K, Takehisa T, Mizuno T, Kubota K. Antithrombogenic Properties of Amphiphilic Block Copolymer Coatings: Evaluation of Hemocompatibility Using Whole Blood. ACS Biomater Sci Eng 2015; 1:352-362. [PMID: 33445240 DOI: 10.1021/acsbiomaterials.5b00079] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Antithrombogenicity is one of the most critical properties required for materials used in biomedical devices, particularly in devices that contact blood. The antithrombogenicity of surfaces coated with amphiphilic block copolymers composed of hydrophobic poly(2-methoxyethyl acrylate) (M) and hydrophilic poly(N,N-dimethylacrylamide) (D) segments was investigated using plasma protein and whole blood with regard to protein adsorption, thrombus formation, platelet activation, and clotting kinetics. Three types of block copolymers and a random copolymer were synthesized using one-pot reversible addition-fragmentation chain-transfer (RAFT) polymerization under conditions of high yield and high molecular weight. Triblock and 4-arm block copolymers with MDM and (MD)4 architecture, respectively, showed good adhesion to both organic and inorganic substrates, including polyvinyl chloride (PVC) tubes, and the resulting coated surfaces showed superior protein repellency and hemocompatibility compared to the diblock or random copolymer coatings and noncoated control. In a Chandler-loop method with whole blood, PVC tubes coated with MDM and (MD)4 showed improved thromboresistance and adsorption resistance to blood-derived proteins. This high hemocompatibility was also confirmed with human whole blood by thrombelastography (suppression of blood-clotting behavior in both intrinsic and extrinsic coagulation pathways) and platelet function analyses (significant reductions in the aggregation activity of platelets under two types of stimulation). The antithrombogenicity has been discussed based on the structural analyses of the MDM-coated surface. The results of this study will enable the development of more effective biomedical and analytical devices with excellent antithrombogenic characteristics by using a simple and environmentally friendly approach.
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Affiliation(s)
- Kazutoshi Haraguchi
- Material Chemistry Laboratory, Kawamura Institute of Chemical Research, Sakura, Chiba 285-0078 Japan.,Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University, Narashino, Chiba 275-8575 Japan
| | - Toru Takehisa
- Material Chemistry Laboratory, Kawamura Institute of Chemical Research, Sakura, Chiba 285-0078 Japan.,Central Research Laboratories, DIC Co., Sakura, Chiba 285-8668, Japan
| | - Toshihide Mizuno
- Department of Artificial Organs, Research Institute, National Cerebral and Cardiovascular Center, Suita, Osaka, 565-8565, Japan
| | - Kazuomi Kubota
- Material Chemistry Laboratory, Kawamura Institute of Chemical Research, Sakura, Chiba 285-0078 Japan.,Central Research Laboratories, DIC Co., Sakura, Chiba 285-8668, Japan
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99983
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Lin YC, Chen CY, Chen HL, Hashimoto T, Chen SA, Li YC. Hierarchical self-assembly of nanoparticles in polymer matrix and the nature of the interparticle interaction. J Chem Phys 2015; 142:214905. [DOI: 10.1063/1.4921567] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Yu-Chiao Lin
- Department of Chemical Engineering and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Chun-Yu Chen
- National Synchrotron Radiation Research Center, Hsinchu 300, Taiwan
| | - Hsin-Lung Chen
- Department of Chemical Engineering and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Takeji Hashimoto
- Department of Chemical Engineering and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
- Quantum Beam Science Center, Japan Atomic Energy Agency, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan and Kyoto University, Kyoto 606-6501, Japan
| | - Show-An Chen
- Department of Chemical Engineering and Frontier Research Center on Fundamental and Applied Sciences of Matters, National Tsing Hua University, Hsinchu 30013, Taiwan
| | - Yen-Cheng Li
- Material and Chemical Research Laboratories, Industrial Technology Research Institute, Hsinchu 300, Taiwan
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99984
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Zhong M, Liu XY, Shi FK, Zhang LQ, Wang XP, Cheetham AG, Cui H, Xie XM. Self-healable, tough and highly stretchable ionic nanocomposite physical hydrogels. SOFT MATTER 2015; 11:4235-4241. [PMID: 25892460 DOI: 10.1039/c5sm00493d] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present a facile strategy to synthesize self-healable tough and highly stretchable hydrogels. Our design rationale for the creation of ionic cross-linked hydrogels is to graft an acrylic acid monomer on the surface of vinyl hybrid silica nanoparticles (VSNPs) for the growth of poly(acrylic) acid (PAA), and the obtained VSNP-PAA nanobrush can be used as a gelator. Physical cross-linking through hydrogen bonding and ferric ion-mediated ionic interactions between PAA polymer chains of the gelators yielded ionic nanocomposite physical hydrogels with excellent and balanced mechanical properties (tensile strength 860 kPa, elongation at break ∼2300%), and the ability to self-repair (tensile strength ∼560 kPa, elongation at break ∼1800%). The toughness and stretchability arise from the reversible cross-linking interactions between the polymer chains that help dissipate energy through stress (deformation) triggered dynamic processes. These unique properties will enable greater application of these hydrogel materials, especially in tissue engineering.
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Affiliation(s)
- Ming Zhong
- Laboratory of Advanced Materials (MOE), Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.
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99985
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Martins P, Silva M, Lanceros-Mendez S. Determination of the magnetostrictive response of nanoparticles via magnetoelectric measurements. NANOSCALE 2015; 7:9457-61. [PMID: 25967251 DOI: 10.1039/c5nr01397f] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/14/2023]
Abstract
It is successfully demonstrated that nanoparticle's magnetostriction can be accurately determined based on the magnetoelectric effect measured on polymeric composite materials. This represents a novel, simple and versatile method for the determination of particle's magnetostriction at the nano scale and in their dispersed state, which has been, up to now, a difficult and imprecise task.
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Affiliation(s)
- P Martins
- Centro/Departamento de Física, Universidade do Minho, 4710-057 Braga, Portugal.
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99986
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Filimon A, Avram E, Dunca S. Surface and interface properties of functionalized polysulfones: Cell-material interaction and antimicrobial activity. POLYM ENG SCI 2015. [DOI: 10.1002/pen.24103] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Anca Filimon
- Department of Physical Chemistry of Polymers; “Petru Poni” Institute of Macromolecular Chemistry; 41A Gr. Ghica Voda Alley 700487 Iasi Romania
| | - Ecaterina Avram
- Department of Physical Chemistry of Polymers; “Petru Poni” Institute of Macromolecular Chemistry; 41A Gr. Ghica Voda Alley 700487 Iasi Romania
| | - Simona Dunca
- Department of Microbiology; Biology Faculty; “Alexandru Ioan Cuza” University of Iasi; 11 Carol I Bvd., 700506 Iasi Romania
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99987
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Wan X, Zhang Y, Deng Y, Zhang Q, Li J, Wang K, Li J, Tan H, Fu Q. Effects of interaction between a polycation and a nonionic polymer on their cross-assembly into mixed micelles. SOFT MATTER 2015; 11:4197-4207. [PMID: 25882114 DOI: 10.1039/c5sm00380f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
In this paper, to investigate the effects of interactions between poly(quaternary ammonium) salts (PQAs) and poly(ethylene glycol) on their mixed micellar surface structures and properties under spontaneous conditions, a series of PQAs were first designed and synthesized by atom transfer radical polymerization (ATRP) using 2-(dimethylamino) ethyl methacrylate (DMAEMA) quaternized by bromobutane, bromooctane, and bromododecane, respectively. Poly(poly(ethylene glycol) methyl ether methacrylate) (PPEG) with a similar degree of polymerization was also prepared using poly(ethylene glycol) methyl ether methacrylate by ATRP. Next, these PQAs were mixed with an equal weight of PPEG in water to cross-assemble into mixed micelles. The structures and features of these mixed micelles were characterized by fluorescence measurements, transmission electron microscopy (TEM), dynamic light scattering (DLS), phase analysis light scattering (PALS), proton nuclear magnetic resonance ((1)H NMR), and hydrogen-hydrogen correlation spectroscopy nuclear magnetic resonance (H-H COSY NMR). These results suggest that PQAs and PPEG mixtures can cross-assemble into mixed micelles with low CMC. The surface structures, particle sizes, size distributions, and zeta potentials of PQAs and PPEG mixtures can be tailored by varying the alkyl chain length in quaternary ammonium salts, and the alkyl chain length also influences the distribution and the alkyl chain orientation of quaternary ammonium salts on mixed micelle surfaces. In addition, cytotoxicity of these mixed micelles can be markedly reduced by PPEG compared with their corresponding PQAs, but their good antibacterial activities are still maintained to a certain degree, as evaluated by methyl tetrazolium assay (MTT) and minimum inhibitory concentration (MIC). Our present work provides a new avenue for the preparation of biocompatible and antibacterial materials for biomedical applications.
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Affiliation(s)
- Xinyuan Wan
- College of Polymer Science and Engineering, State Key Laboratory of Polymer Materials Engineering Sichuan University, Chengdu 610065, China.
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99988
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Supercapacitor behaviors of polyaniline/CuO, polypyrrole/CuO and PEDOT/CuO nanocomposites. Polym Bull (Berl) 2015. [DOI: 10.1007/s00289-015-1422-4] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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99989
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Hashemnejad SM, Kundu S. Nonlinear elasticity and cavitation of a triblock copolymer gel. SOFT MATTER 2015; 11:4315-4325. [PMID: 25915797 DOI: 10.1039/c5sm00330j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Polymer gels are subjected to large-strain deformation during their applications. The gel deformation at large-strain is non-linear and can often lead to failure of the material. Here, we report the large-strain deformation behavior of a physically cross-linked, swollen triblock copolymer gel, which displays unique strain-stiffening response at large-strain. Investigations were performed using large amplitude oscillatory shear (LAOS) and custom developed cavitation rheology techniques. The Gent constitutive equation, which considers finite extensibility of midblock, was fitted with the LAOS data, thereby, linking the estimated parameters from LAOS analysis to the structure of the gel. The pressure responses obtained from the cavitation experiments were modeled using neo-Hookean and Gent constitutive equations. Our results capture the failure behavior of a gel with finite chain extensibility, initiated from a defect within the gel.
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99990
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Patil RM, Hong H, Chai CLL, Ghanwat AA, Ganugapati S, Gnaneshwar R. Synthesis and characterization of α-(cyclic carbonate), ω-hydroxyl/itaconic acid asymmetric telechelic poly(ε-caprolactone). Polym Bull (Berl) 2015. [DOI: 10.1007/s00289-015-1413-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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99991
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Amann M, Willner L, Stellbrink J, Radulescu A, Richter D. Studying the concentration dependence of the aggregation number of a micellar model system by SANS. SOFT MATTER 2015; 11:4208-4217. [PMID: 25892401 DOI: 10.1039/c5sm00469a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We present a small-angle neutron scattering (SANS) structural characterization of n-alkyl-PEO polymer micelles in aqueous solution with special focus on the dependence of the micellar aggregation number on increasing concentration. The single micellar properties in the dilute region up to the overlap concentration ϕ* are determined by exploiting the well characterized unimer exchange kinetics of the model system in a freezing and diluting experiment. The micellar solutions are brought to thermodynamic equilibrium at high temperatures, where unimer exchange is fast, and are then cooled to low temperatures and diluted to concentrations in the limit of infinite dilution. At low temperatures the kinetics, and therefore the key mechanism for micellar rearrangement, is frozen on the experimental time scale, thus preserving the micellar structure in the dilution process. Information about the single micellar structure in the semidilute and concentrated region are extracted from structure factor analysis at high concentrations where the micelles order into fcc and bcc close packed lattices and the aggregation number can be calculated by geometrical arguments. This approach enables us to investigate the aggregation behavior in a wide concentration regime from dilute to 6·ϕ*, showing a constant aggregation number with concentration over a large concentration regime up to a critical concentration about three times ϕ*. When exceeding this critical concentration, the aggregation number was found to increase with increasing concentration. This behavior is compared to scaling theories for star-like polymer micelles.
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Affiliation(s)
- Matthias Amann
- Jülich Centre for Neutron Science JCNS-1 & Institute of Complex Systems ICS-1, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
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99992
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David TMS, Arasho W, Sun SS. Synthesis and structure-optoelectronic property relationships of a series of PPV and SFTV derived polymers. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/pola.27703] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tanya M. S. David
- Center for Materials Research; Norfolk State University; 700 Park Avenue Norfolk Virginia 23504
| | - Wondwossen Arasho
- Center for Materials Research; Norfolk State University; 700 Park Avenue Norfolk Virginia 23504
| | - Sam-Shajing Sun
- Center for Materials Research; Norfolk State University; 700 Park Avenue Norfolk Virginia 23504
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99993
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Fornaguera C, Dols-Perez A, Calderó G, García-Celma MJ, Camarasa J, Solans C. PLGA nanoparticles prepared by nano-emulsion templating using low-energy methods as efficient nanocarriers for drug delivery across the blood-brain barrier. J Control Release 2015; 211:134-43. [PMID: 26057857 DOI: 10.1016/j.jconrel.2015.06.002] [Citation(s) in RCA: 122] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2015] [Revised: 05/29/2015] [Accepted: 06/01/2015] [Indexed: 12/11/2022]
Abstract
Neurodegenerative diseases have an increased prevalence and incidence nowadays, mainly due to aging of the population. In addition, current treatments lack efficacy, mostly due to the presence of the blood-brain barrier (BBB) that limits the penetration of the drugs to the central nervous system. Therefore, novel drug delivery systems are required. Polymeric nanoparticles have been reported to be appropriate for this purpose. Specifically, the use of poly-(lactic-co-glycolic acid) (PLGA) seems to be advantageous due to its biocompatibility and biodegradability that ensure safe therapies. In this work, a novel approximation to develop loperamide-loaded nanoparticles is presented: their preparation by nano-emulsion templating using a low-energy method (the phase inversion composition, PIC, method). This nano-emulsification approach is a simple and very versatile technology, which allows a precise size control and it can be performed at mild process conditions. Drug-loaded PLGA nanoparticles were obtained using safe components by solvent evaporation of template nano-emulsions. Characterization of PLGA nanoparticles was performed, together with the study of the BBB crossing. The in vivo results of measuring the analgesic effect using the hot-plate test evidenced that the designed PLGA loperamide-loaded nanoparticles are able to efficiently cross the BBB, with high crossing efficiencies when their surface is functionalized with an active targeting moiety (a monoclonal antibody against the transferrin receptor). These results, together with the nanoparticle characterization performed here are expected to provide sufficient evidences to end up to clinical trials in the near future.
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Affiliation(s)
- C Fornaguera
- Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), C/Jordi Girona, 18-26 Barcelona, Spain; CIBER of Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain.
| | - A Dols-Perez
- Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), C/Jordi Girona, 18-26 Barcelona, Spain; CIBER of Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain
| | - G Calderó
- Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), C/Jordi Girona, 18-26 Barcelona, Spain; CIBER of Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain
| | - M J García-Celma
- CIBER of Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain; Department of Pharmacy and Pharmaceutical Technology, University of Barcelona, Av/ Joan XXIII s/n, 08028 Barcelona, Spain
| | - J Camarasa
- Department of Pharmacology and Therapeutic Chemistry (Pharmacology Section), University of Barcelona, Av/ Joan XXIII s/n, 08028 Barcelona, Spain
| | - C Solans
- Institute of Advanced Chemistry of Catalonia (IQAC-CSIC), C/Jordi Girona, 18-26 Barcelona, Spain; CIBER of Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Barcelona, Spain
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99994
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Allaf RM, Rivero IV, Ivanov IN. Fabrication of co-continuous poly(ε-caprolactone)/polyglycolide blend scaffolds for tissue engineering. J Appl Polym Sci 2015. [DOI: 10.1002/app.42471] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Rula M. Allaf
- Department of Industrial Engineering; German-Jordanian University; Amman 11180 Jordan
| | - Iris V. Rivero
- Department of Industrial and Manufacturing Systems Engineering; Iowa State University; Ames 50011 Iowa
| | - Ilia N. Ivanov
- Center for Nanophase Materials Sciences; Oak Ridge National Laboratory; Oak Ridge 37831 Tennessee
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99995
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Cheng HY, Yang YJ, Li SC, Hong JY, Jang GW. Modification and extrusion coating of polylactic acid films. J Appl Polym Sci 2015. [DOI: 10.1002/app.42472] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Hsiu-Yu Cheng
- Chemical Engineering Division; Material and Chemical Laboratories, Industrial Technology Research Institute; 321 Kuang Fu Road sec. 2 Hsinchu 30011 Taiwan Republic of China
| | - Yin-Ju Yang
- Chemical Engineering Division; Material and Chemical Laboratories, Industrial Technology Research Institute; 321 Kuang Fu Road sec. 2 Hsinchu 30011 Taiwan Republic of China
| | - Shu-Chen Li
- Chemical Engineering Division; Material and Chemical Laboratories, Industrial Technology Research Institute; 321 Kuang Fu Road sec. 2 Hsinchu 30011 Taiwan Republic of China
| | - Jian-Yi Hong
- Chemical Engineering Division; Material and Chemical Laboratories, Industrial Technology Research Institute; 321 Kuang Fu Road sec. 2 Hsinchu 30011 Taiwan Republic of China
| | - Guang-Way Jang
- Chemical Engineering Division; Material and Chemical Laboratories, Industrial Technology Research Institute; 321 Kuang Fu Road sec. 2 Hsinchu 30011 Taiwan Republic of China
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99996
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Boddula R, Srinivasan P. Role of dual dopants in highly ordered crystalline polyaniline nanospheres: Electrode materials in supercapacitors. J Appl Polym Sci 2015. [DOI: 10.1002/app.42510] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Rajender Boddula
- Polymers and Functional Materials Division; Indian Institute of Chemical Technology, Council of Scientific and Industrial Research; Hyderabad 500 007 India
| | - Palaniappan Srinivasan
- Polymers and Functional Materials Division; Indian Institute of Chemical Technology, Council of Scientific and Industrial Research; Hyderabad 500 007 India
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99997
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Toomari Y, Namazi H, Entezami AA. Fabrication of biodendrimeric β-cyclodextrin via click reaction with potency of anticancer drug delivery agent. Int J Biol Macromol 2015; 79:883-93. [PMID: 26056989 DOI: 10.1016/j.ijbiomac.2015.06.010] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2015] [Revised: 05/19/2015] [Accepted: 06/04/2015] [Indexed: 12/01/2022]
Abstract
The aim of this work was the synthesis of biodendrimeric β-cyclodextrin (β-CD) on the secondary face with encapsulation efficacy, with β-CDs moiety to preserve the biocompatibility properties, also particularly growth their loading capacity for drugs with certain size. The new dendrimer, having 14 β-CD residues attached to the core β-CD in secondary face (11), was prepared through click reaction. The encapsulation property of the prepared compound was evaluated by methotrexate (MTX) drug molecule. Characterization of compound 11 was performed with (1)H NMR, (13)C NMR and FTIR and its supramolecular inclusion complex structure was determined using FTIR, DLS, DSC and SEM techniques. In vitro cytotoxicity test results showed that compound 11 has very low or no cytotoxic effect on T47D cancer cells. In vitro drug release study at pHs 3, 5 and 7.4 showed that the release process was noticeably pH dependent and the dendrimer could be used as an appropriate controlled drug delivery system (DDS) for cancer treatment.
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Affiliation(s)
- Yousef Toomari
- Laboratory of Dendrimers and Nano-Biopolymers, Faculty of Chemistry, University of Tabriz, Tabriz, Iran; Research Center for Pharmaceutical Nanotechnology (RCPN), Tabriz University of Medical Science, Tabriz, Iran
| | - Hassan Namazi
- Laboratory of Dendrimers and Nano-Biopolymers, Faculty of Chemistry, University of Tabriz, Tabriz, Iran; Research Center for Pharmaceutical Nanotechnology (RCPN), Tabriz University of Medical Science, Tabriz, Iran.
| | - Ali Akbar Entezami
- Laboratory of Dendrimers and Nano-Biopolymers, Faculty of Chemistry, University of Tabriz, Tabriz, Iran; Research Center for Pharmaceutical Nanotechnology (RCPN), Tabriz University of Medical Science, Tabriz, Iran
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99998
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99999
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Razmimanesh F, Amjad-Iranagh S, Modarress H. Molecular dynamics simulation study of chitosan and gemcitabine as a drug delivery system. J Mol Model 2015; 21:165. [PMID: 26044358 DOI: 10.1007/s00894-015-2705-2] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2015] [Accepted: 05/17/2015] [Indexed: 12/20/2022]
Abstract
By using molecular dynamics (MD) simulation, biodegradable biopolymer chitosan as a carrier for the drug gemcitabine was investigated and the effect of three initial drug concentrations (10, 40, and 80%) on its loading efficiency was studied. Then water was added to the systems of drug and biopolymer and the effects of water on the interactions of drug and chitosan and on the drug loading efficiency were examined. From the results it was found that the maximum loading of the drug occurred at 40% of the drug concentration. The radial distribution function calculations indicated that in the absence of water molecules, the drug molecules were located at shorter distance from chitosan and the loading efficiency of the drug in these systems was higher.
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Affiliation(s)
- Fariba Razmimanesh
- Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Hafez Avenue, Tehran, Iran
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100000
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Nanclares J, Petrović ZS, Javni I, Ionescu M, Jaramillo F. Segmented polyurethane elastomers by nonisocyanate route. J Appl Polym Sci 2015. [DOI: 10.1002/app.42492] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Juliana Nanclares
- Centro de Investigación; Innovación y Desarrollo de Materiales - CIDEMAT, Universidad de Antioquia UdeA; Calle 70 No. 52-21 Medellín Colombia
| | - Zoran S. Petrović
- Kansas Polymer Research Center, Pittsburg State University; Pittsburg Kansas 66762
| | - Ivan Javni
- Kansas Polymer Research Center, Pittsburg State University; Pittsburg Kansas 66762
| | - Mihail Ionescu
- Kansas Polymer Research Center, Pittsburg State University; Pittsburg Kansas 66762
| | - Franklin Jaramillo
- Centro de Investigación; Innovación y Desarrollo de Materiales - CIDEMAT, Universidad de Antioquia UdeA; Calle 70 No. 52-21 Medellín Colombia
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