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Brugman SJT, Ottenbros AB, Megens F, van Enckevort WJP, Vlieg E. Epitaxy of Rhodochrosite (MnCO 3) on Muscovite Mica and Its Relation with Calcite (CaCO 3). CRYSTAL GROWTH & DESIGN 2020; 20:4802-4810. [PMID: 33828440 PMCID: PMC8016177 DOI: 10.1021/acs.cgd.0c00578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 05/18/2020] [Indexed: 06/12/2023]
Abstract
The flatness of muscovite mica makes it a convenient substrate to study epitaxy. We have analyzed the growth of rhodochrosite (MnCO3) crystals in solution and on muscovite mica. Growth at high supersaturations occurs via the formation of amorphous MnCO3, which over time transforms into the crystalline form. In the presence of muscovite mica, epitaxial rhodochrosite crystals with a size of approximately 1 μm form. These crystals are kinetically roughened, because of the high supersaturation. The lattice match between MnCO3 and muscovite was found not to be the main reason for epitaxy. If the growth experiment is performed twice, the original epitaxial MnCO3 crystals are overgrown by many small crystallites. Similarly, spherical MnCO3 crystals with many overgrown facets can be formed on a muscovite surface that is exposed to humidity or by using a higher MnCO3 supersaturation. A comparison with calcite shows that epitaxy strongly depends on initial supersaturation for both carbonates. In contrast to previous studies, we find that at the right supersaturation, epitaxial calcite crystal growth is possible on freshly cleaved muscovite.
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Suwannasom N, Smuda K, Kloypan C, Kaewprayoon W, Baisaeng N, Prapan A, Chaiwaree S, Georgieva R, Bäumler H. Albumin Submicron Particles with Entrapped Riboflavin-Fabrication and Characterization. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E482. [PMID: 30934597 PMCID: PMC6474188 DOI: 10.3390/nano9030482] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 03/15/2019] [Accepted: 03/19/2019] [Indexed: 01/19/2023]
Abstract
Although riboflavin (RF) belongs to the water-soluble vitamins of group B, its solubility is low. Therefore, the application of micro-formulations may help to overcome this limiting factor for the delivery of RF. In this study we immobilized RF in newly developed albumin submicron particles prepared using the Co-precipitation Crosslinking Dissolution technique (CCD-technique) of manganese chloride and sodium carbonate in the presence of human serum albumin (HSA) and RF. The resulting RF containing HSA particles (RF-HSA-MPs) showed a narrow size distribution in the range of 0.9 to 1 μm, uniform peanut-like morphology, and a zeta-potential of -15 mV. In vitro release studies represented biphasic release profiles of RF in a phosphate buffered saline (PBS) pH 7.4 and a cell culture medium (RPMI) 1640 medium over a prolonged period. Hemolysis, platelet activation, and phagocytosis assays revealed a good hemocompatibility of RF-HSA-MPs.
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Affiliation(s)
- Nittiya Suwannasom
- Institute of Transfusion Medicine, Charité-Universitätsmedizin Berlin, 10117 Berlin, Germany.
- School of Medical Sciences, University of Phayao, Phayao 56000, Thailand.
| | - Kathrin Smuda
- Institute of Transfusion Medicine, Charité-Universitätsmedizin Berlin, 10117 Berlin, Germany.
| | - Chiraphat Kloypan
- Institute of Transfusion Medicine, Charité-Universitätsmedizin Berlin, 10117 Berlin, Germany.
- School of Allied Health Sciences, University of Phayao, Phayao 56000, Thailand.
| | - Waraporn Kaewprayoon
- Institute of Transfusion Medicine, Charité-Universitätsmedizin Berlin, 10117 Berlin, Germany.
- Faculty of Pharmacy, Payap University, Chiang Mai 50000, Thailand.
| | - Nuttakorn Baisaeng
- School of Pharmaceutical Sciences, University of Phayao, Phayao 56000, Thailand.
| | - Ausanai Prapan
- Institute of Transfusion Medicine, Charité-Universitätsmedizin Berlin, 10117 Berlin, Germany.
- Faculty of Allied Health Sciences, Naresuan University, Phitsanulok 65000, Thailand.
| | - Saranya Chaiwaree
- Institute of Transfusion Medicine, Charité-Universitätsmedizin Berlin, 10117 Berlin, Germany.
- Faculty of Pharmacy, Payap University, Chiang Mai 50000, Thailand.
| | - Radostina Georgieva
- Institute of Transfusion Medicine, Charité-Universitätsmedizin Berlin, 10117 Berlin, Germany.
- Department of Medical Physics, Biophysics and Radiology, Medical Faculty, Trakia University, 6000 Stara Zagora, Bulgaria.
| | - Hans Bäumler
- Institute of Transfusion Medicine, Charité-Universitätsmedizin Berlin, 10117 Berlin, Germany.
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Simioni AR, de Jesus PCC, Tedesco AC. Layer-by-layer hollow photosensitizer microcapsule design via a manganese carbonate hard template for photodynamic therapy in cells. Photodiagnosis Photodyn Ther 2018; 22:169-177. [PMID: 29684688 DOI: 10.1016/j.pdpdt.2018.04.011] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Revised: 04/02/2018] [Accepted: 04/18/2018] [Indexed: 11/30/2022]
Abstract
BACKGROUND Microcapsules fabricated using layer-by-layer self-assembly have unique properties, making them attractive for drug delivery applications. The technique has been improved, allowing the deposition of multiple layers of oppositely charged polyelectrolytes on spherical, colloidal templates. These templates can be decomposed by coating multiple layers, resulting in hollow shells. In this paper, we describe a novel drug delivery system for loading photosensitizer drugs into hollow multilayered microcapsules for photoprocess applications. METHODS Manganese carbonate particles were prepared by mixing NH4HCO3 and MnSO4 and performing consecutive polyelectrolyte adsorption processes onto these templates using poly-(sodium 4-styrene sulfonate) and poly-(allylamine hydrocholoride). A photosensitizer was also incorporated into the layers. Hollow spheres were fabricated by removing the cores in the acidic solution. The hollow, multilayered microcapsules were studied by scanning electron microscopy, steady-state, and time-resolved techniques. Their biological activity was evaluated in vitro with cancer cells using a conventional MTT assay. RESULTS The synthesized CaCO3 microparticles were uniform, non-aggregated, and highly porous spheres. The phthalocyanine derivatives loaded in the microcapsules maintained their photophysical behaviour after encapsulation. The spectroscopic results presented here showed excellent photophysical behaviour of the studied drug. We observed a desirable increase in singlet oxygen production, which is favourable for the PDT protocol. Cell viability after treatment was determined and the proposed microcapsules caused 80% cell death compared to the control. CONCLUSIONS The results demonstrate that photosensitizer adsorption into the CaCO3 microparticle voids together with the layer-by-layer assembly of biopolymers provide a method for the fabrication of biocompatible microcapsules for use as biomaterials.
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Affiliation(s)
- Andreza Ribeiro Simioni
- Organic Synthesis Laboratory, Research and Development Institute - IPD, Vale do Paraíba University, Av. Shishima Hifumi 2911, CEP 12244-000, São José dos Campos, Brazil
| | - Priscila Costa Carvalho de Jesus
- Department of Chemistry, Center of Nanotechnology and Tissue Engineering Photobiology and Photomedicine Research Group, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, Av. dos Bandeirantes 3900, 14040-901, Vila Monte Alegre, University of São Paulo, Brazil
| | - Antonio Claudio Tedesco
- Department of Chemistry, Center of Nanotechnology and Tissue Engineering Photobiology and Photomedicine Research Group, Faculty of Philosophy, Sciences and Letters of Ribeirão Preto, Av. dos Bandeirantes 3900, 14040-901, Vila Monte Alegre, University of São Paulo, Brazil.
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Zhao B, Yang Z, Ran R, Guo Z, Wu X, Weng D. Fabrication of hollow-structured FeO -MnO oxidative catalysts with ultra-large surface area. CATAL COMMUN 2018. [DOI: 10.1016/j.catcom.2017.10.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022] Open
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5
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Xiong Y, Georgieva R, Steffen A, Smuda K, Bäumler H. Structure and properties of hybrid biopolymer particles fabricated by co-precipitation cross-linking dissolution procedure. J Colloid Interface Sci 2017; 514:156-164. [PMID: 29248817 DOI: 10.1016/j.jcis.2017.12.030] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2017] [Revised: 12/06/2017] [Accepted: 12/11/2017] [Indexed: 02/06/2023]
Abstract
The Co-precipitation Crosslinking Dissolution technique (CCD-technique) allows a few-steps fabrication of particles composed of different biopolymers and bioactive agents under mild conditions. Morphology and properties of the fabricated biopolymer particles depend on the fabrication conditions, the nature of the biopolymers and additives, but also on the choice of the inorganic templates for co-precipitation. Here, we investigate the influence of an acidic biopolymer, hyaluronic acid (HA), on the formation of particles from bovine hemoglobin and bovine serum albumin applying co-precipitation with CaCO3 and MnCO3. CaCO3 templated biopolymer particles are almost spherical with particle size from 2 to 20 µm and protein entrapment efficiency from 13 to 77%. Presence of HA causes significant structural changes of the particles and decreasing protein entrapment efficiency. In contrast, MnCO3 templated particles exhibit uniform peanut shape and submicron size with remarkably high protein entrapment efficiency of nearly 100%. Addition of HA has no influence on the protein entrapment efficiency or on morphology and size of the particles. These effects can be attributed to the strong interaction of Mn2+ with proteins and much weaker interaction with HA. Therefore, entrapment efficiency, size and structure of biopolymer particles can be optimized by varying the mineral templates and additives.
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Affiliation(s)
- Yu Xiong
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Transfusion Medicine, Charitéplatz 1, 10117 Berlin, Germany.
| | - Radostina Georgieva
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Transfusion Medicine, Charitéplatz 1, 10117 Berlin, Germany
| | - Axel Steffen
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Transfusion Medicine, Charitéplatz 1, 10117 Berlin, Germany
| | - Kathrin Smuda
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Transfusion Medicine, Charitéplatz 1, 10117 Berlin, Germany
| | - Hans Bäumler
- Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Institute of Transfusion Medicine, Charitéplatz 1, 10117 Berlin, Germany.
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Liu X, Zheng H, Li G, Li H, Zhang P, Tong W, Gao C. Fabrication of polyurethane microcapsules with different shapes and their influence on cellular internalization. Colloids Surf B Biointerfaces 2017; 158:675-681. [DOI: 10.1016/j.colsurfb.2017.06.036] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Revised: 06/06/2017] [Accepted: 06/22/2017] [Indexed: 02/07/2023]
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Tang Y, Lu Y, Luo G. Synthesis of Micro–Nano-assembled Manganese Carbonate via Aqueous Precipitation Assisted by Ethanol. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b02039] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yanqing Tang
- State Key Laboratory of Chemical
Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Yangcheng Lu
- State Key Laboratory of Chemical
Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
| | - Guangsheng Luo
- State Key Laboratory of Chemical
Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China
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Nassar MY, Amin AS, Ahmed IS, Abdallah S. Sphere-like Mn2O3 nanoparticles: Facile hydrothermal synthesis and adsorption properties. J Taiwan Inst Chem Eng 2016. [DOI: 10.1016/j.jtice.2016.03.041] [Citation(s) in RCA: 49] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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9
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Shams K, Fayazbakhsh A. Dynamics of reactive chromatographic columns of inert core/hollow/film coated spherical packing: An analytical solution and applications. J Chromatogr A 2014; 1370:93-104. [DOI: 10.1016/j.chroma.2014.10.032] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 09/02/2014] [Accepted: 10/09/2014] [Indexed: 11/28/2022]
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10
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Yunoki A, Tsuchiya E, Fukui Y, Fujii A, Maruyama T. Preparation of inorganic/organic polymer hybrid microcapsules with high encapsulation efficiency by an electrospray technique. ACS APPLIED MATERIALS & INTERFACES 2014; 6:11973-11979. [PMID: 25011051 DOI: 10.1021/am503030c] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Microcapsules composed of calcium phosphate and chitosan were prepared in a single step by electrospraying. An aqueous solution containing calcium chloride and chitosan was electrosprayed into a phosphate solution to form a calcium phosphate shell on the sprayed droplets. The resulting microcapsules were 350 μm in average diameter. Investigation using fluorescently labeled chitosan and XRD measurements revealed that the shells of the microcapsules were composed of calcium phosphate (mainly hydroxyapatite) and chitosan. Instead of chitosan, poly(diallyldimethylammonium chloride) and polyethylene glycol were also available for microcapsule production by electrospraying. Variations in the electrospraying conditions resulted in a variety of microcapsule shapes. Various types of substrates were successfully encapsulated in microcapsules with a high encapsulation efficiency (more than 80%). Finally, we succeeded in the encapsulation of living yeast cells in microcapsules, and observed their growth within these microcapsules.
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Affiliation(s)
- Ayumi Yunoki
- Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University , 1-1 Rokkodaicho, Nada-ku, Kobe 657-8501, Japan
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She S, Yu D, Han X, Tong W, Mao Z, Gao C. Fabrication of biconcave discoidal silica capsules and their uptake behavior by smooth muscle cells. J Colloid Interface Sci 2014; 426:124-30. [PMID: 24863774 DOI: 10.1016/j.jcis.2014.03.062] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Revised: 03/21/2014] [Accepted: 03/24/2014] [Indexed: 10/25/2022]
Abstract
Biconcave discoidal silica microcapsules were fabricated by reaction of tetraethoxysilane (TEOS) on biconcave discoidal Ca(OH)2 templates, followed by core removal. The biconcave discoidal morphology of microcapsules was characterized by confocal laser scanning microscopy (CLSM) and transmission electron microscopy (TEM). The thickness of silica capsule shell can be tuned by two methods, "Gradient concentration" method and "Multi-step growth" method. Through the latter one, the shell thickness can be controlled more effectively. Compared with spherical microcapsules, the biconcave discoidal ones were internalized into smooth muscle cells (SMCs) with a slower rate.
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Affiliation(s)
- Shupeng She
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Dahai Yu
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Xu Han
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Weijun Tong
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
| | - Zhengwei Mao
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Changyou Gao
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
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12
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Xiang Y, Yin Z, Li X. Synthesis and characterization of manganese-, nickel-, and cobalt-containing carbonate precursors for high capacity Li-ion battery cathodes. J Solid State Electrochem 2014. [DOI: 10.1007/s10008-014-2461-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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13
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Lee HK, Sakemi D, Selyanchyn R, Lee CG, Lee SW. Titania nanocoating on MnCO3 microspheres via liquid-phase deposition for fabrication of template-assisted core-shell- and hollow-structured composites. ACS APPLIED MATERIALS & INTERFACES 2014; 6:57-64. [PMID: 24320871 DOI: 10.1021/am404052p] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
A novel class of core-shell- and hollow-structured MnCO3/TiO2 composites was synthesized by titania nanocoating on MnCO3 microspheres via two-step liquid-phase deposition at room temperature. Morphological change from core-shell to hollow microparticles was possible in the prepared samples by controlling prereaction time of MnCO3 and [NH4]2TiF6. Upon the prereaction process, the core of the core-shell MnCO3/TiO2 became highly porous, and a honeycomb-like surface that resembled the orientation of self-assembled MnCO3 nanocrystals was developed. The MnCO3 core was completely removed after 6 h prereaction. Calcination at 600 °C resulted in the transformation of both core-shell- and hollow-structured composites to Mn2O3/TiO2 anatase microspheres that retained their original morphologies. X-ray diffraction, field-emission scanning electron microscopy, Fourier transform infrared spectroscopy, transmission electron microscopy, and electron probe microanalysis were employed for microsphere characterization. As the first trial for application of the synthesized materials, solid-extraction of organics from aqueous media was examined using methylene blue (MB). Both types of Mn2O3/TiO2 composites showed very fast adsorption of MB with high extraction values of 5.2 and 6.4 μmol g(-1) for the core-shell and hollow structures, respectively. Current work provides a new approach for facile fabrication of titania-metal oxide nanocomposites with unique morphological features and promising application possibilities.
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Affiliation(s)
- Hack-Keun Lee
- Graduate School of Environmental Engineering, The University of Kitakyushu , Kitakyushu 808-0135, Japan
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Saladino R, Guazzaroni M, Crestini C, Crucianelli M. Dye Degradation by Layer-by-Layer Immobilised Peroxidase/Redox Mediator Systems. ChemCatChem 2013. [DOI: 10.1002/cctc.201200660] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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15
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She S, Shan B, Li Q, Tong W, Gao C. Phenomenon and Mechanism of Capsule Shrinking in Alkaline Solution Containing Calcium Ions. J Phys Chem B 2012; 116:13561-7. [DOI: 10.1021/jp307922e] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Shupeng She
- MOE Key Laboratory
of Macromolecular Synthesis and
Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Bowen Shan
- MOE Key Laboratory
of Macromolecular Synthesis and
Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Qinqin Li
- MOE Key Laboratory
of Macromolecular Synthesis and
Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Weijun Tong
- MOE Key Laboratory
of Macromolecular Synthesis and
Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
| | - Changyou Gao
- MOE Key Laboratory
of Macromolecular Synthesis and
Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
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She S, Xu C, Yin X, Tong W, Gao C. Shape deformation and recovery of multilayer microcapsules after being squeezed through a microchannel. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:5010-5016. [PMID: 22381035 DOI: 10.1021/la3003299] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The deformation and recovery behaviors of multilayer microcapsules were investigated after being forced to flow through a microchannel. The microchannel device with a constriction (5.7 μm in depth) in the middle was designed, and the multilayer microcapsules with different size and layer thickness (and thereby different mechanical strength) were used. Deformation in the microchannel was observed for all the capsules with a size larger than the constriction height, and its extent was mainly governed by the difference between capsule size and constriction height. The squeezed microcapsules could recover their original spherical shape when the deformation extent was smaller than 16%, whereas permanent physical deformation took place when the deformation extent was larger than 34%. The capsules filled with polyelectrolytes could greatly enhance their shape recovery ability due to the higher osmotic pressure in the capsule interior and could well maintain the preloaded low-molecular-weight dyes regardless of the squeezing.
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Affiliation(s)
- Shupeng She
- MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
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Kanimozhi V, Chinnamuth C. Engineering Core/hallow Shell Nanomaterials to Load Herbicide Active Ingredient for Controlled Release. ACTA ACUST UNITED AC 2012. [DOI: 10.3923/rjnn.2012.58.69] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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18
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Han Y, Tong W, Zhang Y, Gao C. Fabrication of Chitosan Single-Component Microcapsules With a Micrometer-Thick and Layered Wall Structure by Stepwise Core-Mediated Precipitation. Macromol Rapid Commun 2012; 33:326-31. [DOI: 10.1002/marc.201100685] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2011] [Revised: 11/11/2011] [Indexed: 11/06/2022]
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19
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Lyophilization of Protein-Loaded Polyelectrolyte Microcapsules. Pharm Res 2011; 28:1765-73. [DOI: 10.1007/s11095-011-0411-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Accepted: 02/25/2011] [Indexed: 10/18/2022]
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20
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Zhang H, Zhou K, Li Z, Huang S. Synthesis of hollow hybrid hydroxyapatite microspheres based on chitosan-poly(acrylic acid) microparticles. Biomed Mater 2009; 4:031002. [PMID: 19372618 DOI: 10.1088/1748-6041/4/3/031002] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Core-template-free hybrid hydroxyapatite (HA) hollow microspheres based on a chitosan-poly acrylic acid (CS-PAA) complex were prepared. The amine groups on chitosan can interact with the carboxyl groups of poly(acrylic acid) to form hollow microspheres. The hollow HA microspheres of about 1.0 microm are obtained by heterogeneous nucleation of HA on CS-PAA hollow spheres. Gelatin (Gel), acting as a novel cross-link agent, is introduced to bind the spheres of CS-PAA and HA. The forming mechanism of hollow spheres and the influencing factors on the size of microspheres are investigated. In addition, the role of Gel is elucidated in the forming process of the hollow hybrid sphere.
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Affiliation(s)
- Haibin Zhang
- State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, People's Republic of China
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Zhu Y, Tong W, Gao C, Möhwald H. Assembly of polymeric micelles into hollow microcapsules with extraordinary stability against extreme pH conditions. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:7810-7816. [PMID: 18590300 DOI: 10.1021/la801119z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Hollow microcapsules containing polymeric micelles in their walls were fabricated by alternating assembly of poly(allylamine hydrochloride) (PAH) and poly(styrene- b-acrylic acid) (PS- b-PAA) micelles on MnCO(3) microparticles followed by sacrificing the templates in acid solution. The successful formation of PAH/micelle multilayers on both planar and curved substrates was confirmed by UV-vis spectroscopy, ellipsometry, and xi-potential measurements. The PS- b-PAA micelles retained their structure during the whole assembly process. The as-prepared microcapsules showed extraordinary stability against concentrated HCl (37%) and 0.1 M NaOH solutions. No variation in capsule size or shape was observed in acidic solution, while slight swelling and distortion of the capsules took place in alkaline solution. However, these capsules completely recovered their original size and morphology after being incubated in acidic solution again. The microcapsules, in which large voids exist between the micelle grains on the walls, were totally permeable to fluorescein-tagged dextran with an M(w) of 2000 kDa. Assembly of additional PAH/poly(sodium 4-styrenesulfonate) multilayers could substantially reduce the permeation of the same molecules. These multicompartmental capsules combine polymeric micelles with multilayer polyelectrolyte microcapsules and could possibly be imparted with multifunctions, thus possibly finding diverse applications in the fields of drug delivery, biosensing, and nanobiotechnology.
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Affiliation(s)
- Yi Zhu
- Key Laboratory of Macromolecular Synthesis and Functionalization, Ministry of Education, and Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China
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22
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pH-responsive protein microcapsules fabricated via glutaraldehyde mediated covalent layer-by-layer assembly. Colloid Polym Sci 2008. [DOI: 10.1007/s00396-008-1885-z] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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23
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Zhu Y, Tong W, Gao C, Möhwald H. Fabrication of bovine serum albumin microcapsules by desolvation and destroyable cross-linking. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b714647g] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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