1
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Itoh T, Okuno M, Moriya Y, Shimomoto H, Ihara E. Poly(acrylic acid) block copolymers as stabilizers for dispersion polymerization. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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2
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Seike M, Asaumi Y, Kawashima H, Hirai T, Nakamura Y, Fujii S. Morphological and chemical stabilities of polypyrrole in aqueous media for 1 year. Polym J 2021. [DOI: 10.1038/s41428-021-00572-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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3
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Terao T, Shiraishi H, Yamazaki M, Hayakawa T, Ohta N, Fujii S, Nakamura Y, Hirai T. Hairy Particles Synthesized by Living Anionic Polymerization-induced Self-assembly and Evaluation of Their Nanostructure. CHEM LETT 2021. [DOI: 10.1246/cl.200957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Toshiki Terao
- Department of Applied Chemistry, Faculty of Engineering, and Graduate School of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan
| | - Hibiki Shiraishi
- Department of Applied Chemistry, Faculty of Engineering, and Graduate School of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan
| | - Mikito Yamazaki
- Department of Applied Chemistry, Faculty of Engineering, and Graduate School of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan
| | - Teruaki Hayakawa
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-S8-36 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Noboru Ohta
- Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198, Japan
| | - Syuji Fujii
- Department of Applied Chemistry, Faculty of Engineering, and Graduate School of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan
| | - Yoshinobu Nakamura
- Department of Applied Chemistry, Faculty of Engineering, and Graduate School of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan
| | - Tomoyasu Hirai
- Department of Applied Chemistry, Faculty of Engineering, and Graduate School of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan
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4
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Fujii S. Stimulus-responsive soft dispersed systems developed based on functional polymer particles: bubbles and liquid marbles. Polym J 2019. [DOI: 10.1038/s41428-019-0233-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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5
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Itoh T, Kojima K, Shimomoto H, Ihara E. Control of lengths and densities of surface-attached chains on polymer particles prepared by dispersion polymerization using macromonomer stabilizer. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.10.040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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6
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Ito M, Takano K, Hanochi H, Asaumi Y, Yusa SI, Nakamura Y, Fujii S. pH-Responsive Aqueous Bubbles Stabilized With Polymer Particles Carrying Poly(4-vinylpyridine) Colloidal Stabilizer. Front Chem 2018; 6:269. [PMID: 30065921 PMCID: PMC6056661 DOI: 10.3389/fchem.2018.00269] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2018] [Accepted: 06/14/2018] [Indexed: 11/28/2022] Open
Abstract
Free radical dispersion polymerization was conducted to synthesize near-monodispersed, micrometer-sized polystyrene (PS) particles carrying pH-responsive poly(4-vinylpyridine) (P4VP) colloidal stabilizer (P4VP-PS particles). The P4VP-PS particles were extensively characterized in terms of morphology, size, size distribution, chemical composition, surface chemistry, and pH-response using optical and scanning electron microscopies, elemental microanalysis, X-ray photoelectron spectroscopy, laser diffraction particle size analysis, and zeta potential measurement. The P4VP-PS particles can work as a pH-responsive stabilizer of aqueous bubbles by adsorption at the air-water interface. At and above pH 4.0, where the particles have partially protonated/non-protonated P4VP stabilizer with relatively hydrophobic character, particle-stabilized bubbles were formed. Optical and scanning electron microscopy studies confirmed that the P4VP-PS particles were adsorbed at the air-water interface of the bubbles in aqueous media. At and below pH 3.0, where the particles have cationic P4VP stabilizer with water-soluble character, no bubble was formed. Rapid disruption of the bubbles can be induced by decreasing the pH; the addition of acid caused the in situ protonation of pyridine groups in P4VP, which impart water-soluble character to the P4VP stabilizer, and the P4VP-PS particles were desorbed from the air-water interface. The bubble stabilization/destabilization cycles could be repeated at least five times.
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Affiliation(s)
- Masaya Ito
- Graduate Course in Applied Chemistry, Environmental and Biomedical Engineering, Graduate School of Engineering, Osaka Institute of Technology, Osaka, Japan
| | - Koki Takano
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, Osaka, Japan
| | - Haruka Hanochi
- Graduate Course in Applied Chemistry, Environmental and Biomedical Engineering, Graduate School of Engineering, Osaka Institute of Technology, Osaka, Japan
| | - Yuta Asaumi
- Graduate Course in Applied Chemistry, Environmental and Biomedical Engineering, Graduate School of Engineering, Osaka Institute of Technology, Osaka, Japan
| | - Shin-Ichi Yusa
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, Hyogo, Japan
| | - Yoshinobu Nakamura
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, Osaka, Japan.,Nanomaterials Microdevices Research Center, Osaka Institute of Technology, Osaka, Japan
| | - Syuji Fujii
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, Osaka, Japan.,Nanomaterials Microdevices Research Center, Osaka Institute of Technology, Osaka, Japan
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7
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Sugihara S, Sudo M, Hirogaki K, Irie S, Maeda Y. Synthesis of Various Poly(2-hydroxyethyl vinyl ether)-Stabilized Latex Particles via Surfactant-Free Emulsion Polymerization in Water. Macromolecules 2018. [DOI: 10.1021/acs.macromol.7b02417] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Shinji Sugihara
- Department of Applied Chemistry and Biotechnology,
Graduate School
of Engineering, and ‡Department of Frontier Fiber Technology and Science, Graduate School
of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Masahiro Sudo
- Department of Applied Chemistry and Biotechnology,
Graduate School
of Engineering, and ‡Department of Frontier Fiber Technology and Science, Graduate School
of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Kazumasa Hirogaki
- Department of Applied Chemistry and Biotechnology,
Graduate School
of Engineering, and ‡Department of Frontier Fiber Technology and Science, Graduate School
of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Satoshi Irie
- Department of Applied Chemistry and Biotechnology,
Graduate School
of Engineering, and ‡Department of Frontier Fiber Technology and Science, Graduate School
of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
| | - Yasushi Maeda
- Department of Applied Chemistry and Biotechnology,
Graduate School
of Engineering, and ‡Department of Frontier Fiber Technology and Science, Graduate School
of Engineering, University of Fukui, 3-9-1 Bunkyo, Fukui 910-8507, Japan
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8
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Sekido T, Kappl M, Butt HJ, Yusa S, Nakamura Y, Fujii S. Effects of pH on the structure and mechanical properties of dried pH-responsive latex particles. SOFT MATTER 2017; 13:7562-7570. [PMID: 28972614 DOI: 10.1039/c7sm01625e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Micrometer-sized monodisperse polystyrene (PS) particles carrying a pH-responsive poly[2-(diethylamino)ethyl methacrylate] (PDEA) colloidal stabilizer were synthesized via free radical dispersion polymerization. X-ray photoelectron spectroscopy and electrophoretic measurements verified that PDEA covered the PS particle surface. At pH 3.0 and 6.3, where the PDEA is protonated and cationically charged, the PDEA-PS particles were well dispersed in aqueous media thanks to the water soluble PDEA stabilizer and slowly sedimented due to gravity and enriched at the bottom of the glass vials. At pH 10.0, where the PDEA is non-protonated and neutral, the PDEA-PS particles weakly aggregated due to non-hydrated and collapsed PDEA. These PDEA-PS particles and aggregates sedimented to the bottom. The sediment height observed at pH 10.0 was higher than those observed at pH 3.0 and 6.3 in both wet and dry systems, which indicated that a larger porosity was formed at pH 10.0. Mechanical testing experiments confirmed that the fracture toughness of the dried materials decreased with an increase of pH. The fracture toughness was found to be correlated with the degree of particle ordering in the dried particulate materials: more ordered, dense packings lead to a higher fracture toughness compared to amorphous, less dense packings. Thus, we could tune fracture toughness and degree of particle ordering by controlling the pH.
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Affiliation(s)
- T Sekido
- Division of Applied Chemistry, Graduate School of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka, 535-8585, Japan
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9
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Fujii S, Nakamura Y. Stimuli-Responsive Bubbles and Foams Stabilized with Solid Particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:7365-7379. [PMID: 28478676 DOI: 10.1021/acs.langmuir.7b01024] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Particle-stabilized bubbles and foams have been observed and used in a wide range of industrial sectors and have been exploited as a technology platform for the production of advanced functional materials. The stability, structure, shape, and movement of these bubbles and foams can be controlled by external stimuli such as the pH, temperature, magnetic fields, ultrasonication, mechanical stress, surfactants, and organic solvents. Stimuli-responsive modes can be categorized into three classes: (i) bubbles/foams whose stability can be controlled by the adsorption/desorption/dissolution of solid particles to/from/at gas-liquid interfaces, (ii) bubbles/foams that can move, and (iii) bubbles/foams that can change their shapes and structures. The stimuli-responsive characteristics of bubbles and foams offer potential applications in the areas of controlled encapsulation, delivery, and release.
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Affiliation(s)
- Syuji Fujii
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology , 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan
| | - Yoshinobu Nakamura
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology , 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan
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10
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Fujii S, Mouri E, Akiyama K, Nakayama S, Uda K, Nakamura Y, Matsuoka H. pH-Sensitive Adsorption Behavior of Polymer Particles at the Air-Water Interface. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:1451-1459. [PMID: 28102690 DOI: 10.1021/acs.langmuir.6b03895] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
pH-Sensitive adsorption of polymer particles bearing poly[2-(dimethylamino)ethyl methacrylate] hairs at the air-water interface was investigated using a surface tensiometer, a Langmuir-Blodgett trough, and an X-ray reflectometer. We clarified that the particles are adsorbed at the interface at basic pH; by contrast, at acidic pH, only a small number of particles are adsorbed, whereas the majority are dispersed in the water phase. X-ray reflectometry analysis revealed that a particle monolayer was formed at the air-water interface, which was packed densely under increasing surface pressure, as determined by the electron density profile change. The contact angles of the particles at the air-water interface were estimated to be 29° and 34° at pH 3 and 10, respectively, by direct visualization of the air-water interface position of the particles using a polycyanoacrylate trapping method.
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Affiliation(s)
| | - Emiko Mouri
- Department of Applied Chemistry, Faculty of Engineering, Kyushu Institute of Technology , 1-1 Sensui, Tobata, Kitakyushu, Fukuoka 804-8550, Japan
| | | | | | - Kyohei Uda
- Department of Polymer Chemistry, Kyoto University , Katsura, Nishikyo, Kyoto 615-8510, Japan
| | | | - Hideki Matsuoka
- Department of Polymer Chemistry, Kyoto University , Katsura, Nishikyo, Kyoto 615-8510, Japan
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11
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Nakayama S, Hamasaki S, Ueno K, Mochizuki M, Yusa S, Nakamura Y, Fujii S. Foams stabilized with solid particles carrying stimuli-responsive polymer hairs. SOFT MATTER 2016; 12:4794-4804. [PMID: 27109907 DOI: 10.1039/c6sm00425c] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Submicrometer-sized polystyrene (PS) particles carrying stimuli-responsive poly[2-(diethylamino)ethyl methacrylate] (PDEA) hairs with degrees of polymerization of 30, 60 and 90 were synthesized by dispersion polymerization and used as a particulate foam stabilizer. The effects of the composition of these PDEA-PS particles and foam formation conditions on foamability, foam stability and foam microstructures were extensively investigated. The hairy particles were found to work as an effective stabilizer of aqueous foams in basic media, in which the PDEA hairs are not protonated and thus the particle surfaces exhibit suitable wettability at the air-water interface. In contrast, little to no foam or unstable foams were formed in acidic aqueous media, in which the hairs are protonated and are therefore water soluble. Particles carrying longer hairs resulted in greater foamability and more highly stabilized foams that were capable of persisting for more than one month. Foams were found to form in a narrower pH range when using PS particles with longer hairs, due to both entropic and image charge effects. Data obtained from the touch mixer mixing method showed that both foamability and foam stability increased with increases in the concentration of polymer particles up to 10 wt%, because higher concentrations allowed greater air-water interfacial areas to be stabilized. Conversely, only minimal foam was obtained at and above 15 wt% because of the high viscosity of the resulting aqueous particle dispersion. Trials using the homogenizer mixing method showed that foam with a cream-like texture could be formed even at 40 wt% particle concentration as a result of the improved mixing efficiency. Defoamation could be induced by exposing the foams to HCl vapor. Exposure to acidic vapor led to in situ protonation of the 2-(diethylamino)ethyl methacrylate residues, rendering the PDEA hairs hydrophilic and water soluble, and desorption of the PDEA-PS particles from the air-water interface.
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Affiliation(s)
- S Nakayama
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1, Omiya, Asahi-ku, Osaka 535-8585, Japan.
| | - S Hamasaki
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1, Omiya, Asahi-ku, Osaka 535-8585, Japan.
| | - K Ueno
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1, Omiya, Asahi-ku, Osaka 535-8585, Japan.
| | - M Mochizuki
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1, Omiya, Asahi-ku, Osaka 535-8585, Japan.
| | - S Yusa
- Department of Applied Chemistry, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
| | - Y Nakamura
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1, Omiya, Asahi-ku, Osaka 535-8585, Japan. and Nanomaterials Microdevices Research Center, Osaka Institute of Technology, 5-16-1, Omiya, Asahi-ku, Osaka 535-8585, Japan
| | - S Fujii
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1, Omiya, Asahi-ku, Osaka 535-8585, Japan.
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12
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Mai W, Sun B, Chen L, Xu F, Liu H, Liang Y, Fu R, Wu D, Matyjaszewski K. Water-Dispersible, Responsive, and Carbonizable Hairy Microporous Polymeric Nanospheres. J Am Chem Soc 2015; 137:13256-9. [DOI: 10.1021/jacs.5b08978] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Weicong Mai
- Materials Science Institute, Key Laboratory
for Polymeric Composite and Functional Materials of Ministry of Education,
School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Bin Sun
- Materials Science Institute, Key Laboratory
for Polymeric Composite and Functional Materials of Ministry of Education,
School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Luyi Chen
- Materials Science Institute, Key Laboratory
for Polymeric Composite and Functional Materials of Ministry of Education,
School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Fei Xu
- Materials Science Institute, Key Laboratory
for Polymeric Composite and Functional Materials of Ministry of Education,
School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Hao Liu
- Materials Science Institute, Key Laboratory
for Polymeric Composite and Functional Materials of Ministry of Education,
School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Yeru Liang
- Materials Science Institute, Key Laboratory
for Polymeric Composite and Functional Materials of Ministry of Education,
School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Ruowen Fu
- Materials Science Institute, Key Laboratory
for Polymeric Composite and Functional Materials of Ministry of Education,
School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Dingcai Wu
- Materials Science Institute, Key Laboratory
for Polymeric Composite and Functional Materials of Ministry of Education,
School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou 510275, P. R. China
| | - Krzysztof Matyjaszewski
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States
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13
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Multi-sensitive copolymer hydrogels of N-isopropylacrylamide with several polymerizable azobenzene-containing monomers. JOURNAL OF POLYMER RESEARCH 2015. [DOI: 10.1007/s10965-015-0787-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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14
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The forces and physical properties of polymer particulate monolayers at air/aqueous interfaces. Colloids Surf A Physicochem Eng Asp 2015. [DOI: 10.1016/j.colsurfa.2014.12.035] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Shirin-Abadi AR, Darabi A, Jessop PG, Cunningham MF. Preparation of redispersible polymer latexes using cationic stabilizers based on 2-dimethylaminoethyl methacrylate hydrochloride and 2,2′-azobis[2-(2-imidazolin-2-yl)propane]dihydrochloride. POLYMER 2015. [DOI: 10.1016/j.polymer.2015.01.017] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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16
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Fujii S, Akiyama K, Nakayama S, Hamasaki S, Yusa SI, Nakamura Y. pH- and temperature-responsive aqueous foams stabilized by hairy latex particles. SOFT MATTER 2015; 11:572-579. [PMID: 25426611 DOI: 10.1039/c4sm02236j] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Polystyrene (PS) particles carrying pH- and temperature-responsive poly[2-(dimethylamino)ethyl methacrylate] (PDMA) hairs (PDMA-PS particles) were synthesized by dispersion polymerization. The diameter, diameter distribution, morphology, chemical composition and surface chemistry of the particles were characterized using scanning electron microscopy (SEM), elemental microanalysis, dynamic light scattering and zeta potential measurements. The hydrophilicity-hydrophobicity balance of the PDMA could be tuned by varying both pH and temperature and therefore these sterically stabilized particles acted as doubly stimuli-responsive stabilizers for aqueous foams by adsorption and desorption to/from the air-water interface. At and above pH 6.0, in which range the PDMA hairs were either non-protonated or partially protonated, particle-stabilized foams were formed at both 23 and 55 °C. The foam prepared at 55 °C was the more stable of the two, lasting for at least 24 h, whereas the 23 °C foam destabilized within 24 h. SEM studies indicated that the particles adsorbed at the air-water interface as monolayers at 23 °C and as multilayers at 55 °C. At and below pH 5, in which range the hairs were cationic, hydrophilic and water-soluble, no foam was formed irrespective of temperature. Rapid defoaming could be induced by lowering the solution pH at both temperatures, due to rapid in situ protonation of the PDMA hairs, prompting the PDMA-PS particles to desorb from the air-water interface. The foaming and defoaming cycles could be repeated at least five times.
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Affiliation(s)
- Syuji Fujii
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan.
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17
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Transformable core-corona nanoparticles: Simultaneous change of core morphology and corona wettability in response to temperature. Colloids Surf B Biointerfaces 2014; 123:75-81. [PMID: 25200203 DOI: 10.1016/j.colsurfb.2014.08.031] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 08/22/2014] [Accepted: 08/24/2014] [Indexed: 11/23/2022]
Abstract
We prepared transformable thermoresponsive nanoparticles with variable core softness, controlled by the nanoparticle core's glass transition temperature (Tg). The nanoparticles were prepared by the dispersion copolymerization of butyl methacrylate (BMA) and/or methyl methacrylate (MMA) with a poly(N-isopropylacrylamide) (PNIPAAm) macromonomer in a polar solvent. The shape of the nanoparticle core changed with temperature. We then prepared poly(vinyl alcohol) (PVA) films with dispersed thermoresponsive nanoparticles, to elongate the nanoparticles through a uniaxial stretching of the films at 60°C. In this manner, the nanoparticle shape changed from spherical to rod-like morphologies, depending on the degree of film extension. Additionally, the rod-shaped nanoparticles only changed back to spheres with temperature modulation. The nanoparticle core's Tg value affected the rate of its physical transformation from rods to spheres at 37°C, with a slower rate observed for increased Tg. As the nanorod shape change was relatively minor at 37°C, we could control the shape of these transformable nanoparticles under various physiological conditions, a highly desirable feature for drug delivery applications.
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18
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Surface structure of stimuli-responsive polystyrene particles prepared by dispersion polymerization with a polystyrene/poly(l-lysine) block copolymer as a stabilizer. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.06.069] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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19
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Thiol-terminated hydroxy-functional polymer as a transtab toward polymer latex particles. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2845-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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20
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Synthesis, characterization, and temperature-dependent colloidal stability of poly(N-isopropylacrylamide)-grafted polystyrene/poly(styrene-co-4-vinylbenzyl N, N-diethyldithiocarbamate) hairy particles. Colloid Polym Sci 2012. [DOI: 10.1007/s00396-012-2647-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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21
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Fujii S, Aono K, Suzaki M, Hamasaki S, Yusa SI, Nakamura Y. pH-Responsive Hairy Particles Synthesized by Dispersion Polymerization with a Macroinitiator as an Inistab and Their Use as a Gas-Sensitive Liquid Marble Stabilizer. Macromolecules 2012. [DOI: 10.1021/ma300048m] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Syuji Fujii
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Ohmiya, Asahi-ku,
Osaka 535-8585, Japan
| | - Kodai Aono
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Ohmiya, Asahi-ku,
Osaka 535-8585, Japan
| | - Motomichi Suzaki
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Ohmiya, Asahi-ku,
Osaka 535-8585, Japan
| | - Sho Hamasaki
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Ohmiya, Asahi-ku,
Osaka 535-8585, Japan
| | - Shin-ichi Yusa
- Graduate
School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280, Japan
| | - Yoshinobu Nakamura
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Ohmiya, Asahi-ku,
Osaka 535-8585, Japan
- Nanomaterials Microdevices Research Center, Osaka Institute of Technology, Osaka, Japan
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22
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Su X, Jessop PG, Cunningham MF. Surfactant-Free Polymerization Forming Switchable Latexes That Can Be Aggregated and Redispersed by CO2 Removal and Then Readdition. Macromolecules 2012. [DOI: 10.1021/ma202547c] [Citation(s) in RCA: 93] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xin Su
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston,
Ontario, Canada K7L 3N6
| | - Philip G. Jessop
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston,
Ontario, Canada K7L 3N6
| | - Michael F. Cunningham
- Department of Chemistry, Queen’s University, 90 Bader Lane, Kingston,
Ontario, Canada K7L 3N6
- Department of Chemical Engineering, Queen’s University, 19 Division Street, Kingston,
Ontario, Canada K7L 3N6
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Fujii S, Mochizuki M, Aono K, Hamasaki S, Murakami R, Nakamura Y. pH-responsive aqueous foams stabilized by hairy latex particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:12902-9. [PMID: 21910465 DOI: 10.1021/la203062b] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Polystyrene (PS) latex particles carrying pH-responsive poly[2-(diethylamino)ethyl methacrylate] (PDEA) hair (PDEA-PS particles) were synthesized by dispersion polymerization and characterized in terms of diameter, diameter distribution, morphology, chemical composition, surface chemistry, and pH-response using scanning electron microscopy (SEM), elemental microanalysis, (1)H nuclear magnetic resonance spectroscopy, the laser diffraction method, and zeta potential measurements. The hairy particles can act as pH-responsive stabilizers of aqueous foams by adsorption at the air-water surface. Above pH 8.0, where particles have nonprotonated PDEA hair, which is relatively hydrophobic, particle-stabilized foams are stable for at least 1 month. Optical microscopy and SEM confirmed that flocculated PDEA-PS latex particles were adsorbed at the air-water interface and stabilized the aqueous foams. At pH 6.1 and 7.1, relatively stable foams can be prepared that remain stable for at least 24 h. SEM studies indicated that the PDEA-PS particles were adsorbed at the air-water interface as a monolayer at pH 6.1. At pH 5.1 and 3.1, where the particles have cationic water-soluble PDEA hairs with hydrophilic character, no foam was formed. Rapid defoamation can be induced by lowering the solution pH; the addition of acid caused the in situ protonation of 2-(diethylamino)ethyl methacrylate residues, which impart water-soluble hydrophilic character to the PDEA hair, and the PDEA-PS particles desorbed from the air-water interface. The foaming and defoaming cycles could be repeated at least five times.
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Affiliation(s)
- Syuji Fujii
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Ohmiya, Asahi-ku, Osaka 535-8585, Japan.
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Li L, Xing X, Liu Z. Triply-responsive (thermo/light/pH) copolymeric hydrogel of N-isopropylacrylamide with an azobenzene-containing monomer. J Appl Polym Sci 2011. [DOI: 10.1002/app.35036] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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25
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Preparation of polyacrylonitrile nanoparticles via dispersion polymerization of acrylonitrile using a poly(N-vinyl pyrrolidone)-cobalt complex in an aqueous system. POLYMER 2011. [DOI: 10.1016/j.polymer.2011.07.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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26
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Fujii S, Suzaki M, Armes SP, Dupin D, Hamasaki S, Aono K, Nakamura Y. Liquid marbles prepared from pH-responsive sterically stabilized latex particles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:8067-8074. [PMID: 21631122 DOI: 10.1021/la201317b] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Submicrometer-sized pH-responsive sterically stabilized polystyrene (PS) latex particles were synthesized by dispersion polymerization in isopropyl alcohol with a poly[2-(diethylamino)ethyl methacrylate]- (PDEA-) based macroinitiator. These PDEA-PS latexes were extensively characterized with respect to their particle size distribution, morphology, chemical composition, and pH-responsive behavior. Millimeter- and centimeter-sized "liquid marbles" with aqueous volumes varying between 15 μL and 2.0 mL were readily prepared by rolling water droplets on the dried PDEA-PS latex powder. The larger liquid marbles adopted nonspherical shapes due to gravitational forces; analysis of this deformation enabled the surface tension to be estimated. Scanning electron microscopy and fluorescence microscopy studies indicated that flocs of the PDEA-PS particles were adsorbed at the surface of these water droplets, leading to stable liquid marbles. The relative mechanical integrity of the liquid marbles prepared from alkaline aqueous solution (pH 10) was higher than those prepared from acidic aqueous solution (pH 2) as judged by droplet roller experiments. These liquid marbles exhibited long-term stability (over 1 h) when transferred onto the surface of liquid water, provided that the solution pH of the subphase was above pH 8. In contrast, the use of acidic solutions led to immediate disintegration of these liquid marbles within 10 min, with dispersal of the PDEA-PS latex particles in the aqueous solution. Thus the critical minimum solution pH required for long-term liquid marble stability correlates closely with the known pK(a) value of 7.3 for the PDEA stabilizer chains. Stable liquid marbles were also successfully prepared from aqueous Gellan gum solution and glycerol.
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Affiliation(s)
- Syuji Fujii
- Department of Applied Chemistry, Faculty of Engineering, Osaka Institute of Technology, 5-16-1 Ohmiya, Osaka 535-8585, Japan.
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27
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Mihara M, Jessop P, Cunningham M. Redispersible Polymer Colloids Using Carbon Dioxide as an External Trigger. Macromolecules 2011. [DOI: 10.1021/ma200249q] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masatoshi Mihara
- Department of Chemistry, Queen’s University, Kingston, Ontario, Canada K7L 3N6
| | - Philip Jessop
- Department of Chemistry, Queen’s University, Kingston, Ontario, Canada K7L 3N6
| | - Michael Cunningham
- Department of Chemistry, Queen’s University, Kingston, Ontario, Canada K7L 3N6
- Department of Chemical Engineering, Queen’s University, Kingston, Ontario, Canada K7L 3N6
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Agarwal S, Grabe N. Use of Reactive and Functional Hydrophobes (Hydrophobins) in the Miniemulsion Polymerization of Styrene and Methyl Methacrylate. MACROMOL CHEM PHYS 2011. [DOI: 10.1002/macp.201000638] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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29
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Fujii S, Suzaki M, Nakamura Y, Sakai K, Ishida N, Biggs S. Surface characterization of nanoparticles carrying pH-responsive polymer hair. POLYMER 2010. [DOI: 10.1016/j.polymer.2010.10.041] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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30
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Pi M, Yang T, Yuan J, Fujii S, Kakigi Y, Nakamura Y, Cheng S. Biomimetic synthesis of raspberry-like hybrid polymer–silica core–shell nanoparticles by templating colloidal particles with hairy polyamine shell. Colloids Surf B Biointerfaces 2010; 78:193-9. [DOI: 10.1016/j.colsurfb.2010.02.031] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2009] [Revised: 02/06/2010] [Accepted: 02/28/2010] [Indexed: 10/19/2022]
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31
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Tang X, Liang X, Gao L, Fan X, Zhou Q. Water-soluble triply-responsive homopolymers of N,N
-dimethylaminoethyl methacrylate with a terminal azobenzene moiety. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pola.24034] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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