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Li W, Zhao K, Chen X, Li Y. Dielectric Analysis of Microcapsule-Immobilized Composite Capsules Suspension: Substances Release. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:966-971. [PMID: 31941280 DOI: 10.1021/acs.langmuir.9b03539] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Dielectric spectroscopy has unique advantages in monitoring drug release. In this work, a dielectric measurement was carried out on the release of the substances of microcapsule-immobilized composite capsules, which were fabricated by encapsulating the Perinereis aibuhitensis extract-loaded gum Arabic/gelatin microcapsules (PaE: GA/GE-MCs) in calcium alginate hydrogel (PaE: CA/GA/GE-CCs). We established the dielectric model of PaE: CA/GA/GE-CCs and got in-depth information on the systems. There are two relaxations in the dielectric spectroscopy, both of which are caused by interfacial polarization. The relaxation mechanisms correspond to the interfacial polarization of the PaE-loading core/calcium alginate shell interface and the calcium alginate shell/solution interface, respectively. Besides, the swelling of composite capsules and substance migration in the composite capsules were observed by analyzing phase parameters. Finally, the characteristic release of calcium alginate composite capsules was confirmed, and the substance release mechanism of composite capsules, namely, the swelling-diffusion mechanism, was obtained.
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Affiliation(s)
- Wantong Li
- College of Chemistry , Beijing Normal University , Beijing 100875 , China
| | - Kongshuang Zhao
- College of Chemistry , Beijing Normal University , Beijing 100875 , China
| | - Xiguang Chen
- Biochemistry and Biomaterial Key Laboratory of Shandong Colleges and Universities, College of Marine Life Science , Ocean University of China , Yushan Road , Qingdao , Shandong 266003 , China
| | - Yang Li
- Biochemistry and Biomaterial Key Laboratory of Shandong Colleges and Universities, College of Marine Life Science , Ocean University of China , Yushan Road , Qingdao , Shandong 266003 , China
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2
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Gicquel E, Martin C, Gauthier Q, Engström J, Abbattista C, Carlmark A, Cranston ED, Jean B, Bras J. Tailoring Rheological Properties of Thermoresponsive Hydrogels through Block Copolymer Adsorption to Cellulose Nanocrystals. Biomacromolecules 2019; 20:2545-2556. [DOI: 10.1021/acs.biomac.9b00327] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Erwan Gicquel
- Univ. Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38000 Grenoble, France
| | - Céline Martin
- Univ. Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38000 Grenoble, France
| | - Quentin Gauthier
- Univ. Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38000 Grenoble, France
| | - Joakim Engström
- Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, Teknikringen 56, SE-100 44 Stockholm, Sweden
| | - Clara Abbattista
- Univ. Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38000 Grenoble, France
| | - Anna Carlmark
- Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, KTH Royal Institute of Technology, Teknikringen 56, SE-100 44 Stockholm, Sweden
| | - Emily D. Cranston
- Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, British Columbia V6T 1Z3, Canada
- Department of Wood Science, University of British Columbia, 2424 Main Mall, Vancouver, British Columbia V6T 1Z4, Canada
| | - Bruno Jean
- Univ. Grenoble Alpes, CNRS, CERMAV, 38000 Grenoble, France
| | - Julien Bras
- Univ. Grenoble Alpes, CNRS, Grenoble INP, LGP2, F-38000 Grenoble, France
- Institut Universitaire de France, F-75000 Paris, France
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Li W, Wang J, Yang M, Zhao K. Dielectric Behavior and Phase Behavior of Block Copolymer PEO 13-PPO 30-PEO 13 Aqueous Solution. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2018; 34:5574-5580. [PMID: 29694785 DOI: 10.1021/acs.langmuir.8b00776] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Dielectric spectroscopy can be applied to study the structure and dynamics of block polymer. In this work, dielectric measurements of block copolymer Pluronic L64 solution are carried out in the frequency range between 40 Hz and 110 MHz with variable temperatures and concentrations. We analyze the phase behavior of the PEO13-PPO30-PEO13 (Pluronic L64) aqueous system according to the concentration/temperature-dependence of direct current conductivity. The result indicates the sensitivity of the phase behavior and conductivity of the Pluronic L64 solution to temperature. Besides, two relaxations were observed: relaxation 1 (0.5 MHz) is related to the gelation process, while relaxation 2 (5 MHz) is caused by the interface polarization. On the basis of relaxation 2, the volume fraction and permittivity of the particle were calculated. The formations of the block copolymer micelle and gel are monitored successfully by the temperature/concentration-dependence of the dielectric parameters and the volume fraction.
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Affiliation(s)
- Wantong Li
- College of Chemistry , Beijing Normal University , Beijing 100875 , China
| | - Juan Wang
- College of Chemistry , Beijing Normal University , Beijing 100875 , China
| | - Man Yang
- College of Chemistry , Beijing Normal University , Beijing 100875 , China
| | - Kongshuang Zhao
- College of Chemistry , Beijing Normal University , Beijing 100875 , China
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Asadujjaman A, Bertin A, Schönhals A. Dielectric analysis of the upper critical solution temperature behaviour of a poly(acrylamide-co-acrylonitrile) copolymer system in water. SOFT MATTER 2017; 13:2384-2393. [PMID: 28294239 DOI: 10.1039/c6sm02684b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A copolymer consisting of acrylamide (AAm) and acrylonitrile (AN) in aqueous solution was investigated using broadband dielectric spectroscopy at frequencies between 10-1 Hz and 106 Hz in the temperature range from 2 °C to 60 °C. This system shows an UCST phase behavior. The phase transition and aggregation behavior is monitored by both the temperature and frequency dependence of the complex conductivity σ*(f, T), where the AN fraction and the concentration of the solution were varied. Additionally, the dielectric data are compared with the results obtained from dynamic light scattering measurements. The temperature dependence of the DC conductivity (σDC) of the copolymer solution is monitored and the phase transition temperature (PTT) of the poly(AAm-co-AN) copolymer is deduced from a change in the T-dependence of the DC conductivity. The change in σDC can be explained by decreased effective charge carrier mobility and a reduction of the effective charge number density at temperatures below the phase transition temperature of the poly(AAm-co-AN) solution. A pronounced interfacial polarization effect on the frequency dependence of the real part of the conductivity (σ') is observed at temperatures below the phase transition temperature. The charge carriers are blocked at the formed aggregates giving rise to this interfacial polarization. The dependence of the interfacial polarization on the acrylonitrile fraction in the copolymer and the concentration of the solution is studied in detail and conclusions concerning the internal structures of the copolymer aggregates are drawn.
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Affiliation(s)
- Asad Asadujjaman
- Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany.
| | - Annabelle Bertin
- Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany. and Freie Universität Berlin, Institute of Chemistry and Biochemistry-Organic Chemistry, Takustr. 3, 14195 Berlin, Germany
| | - Andreas Schönhals
- Bundesanstalt für Materialforschung und -prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany.
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5
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Pramanik P, Ghosh S. Thermoresponsive polymersome from a double hydrophilic block copolymer. ACTA ACUST UNITED AC 2015. [DOI: 10.1002/pola.27735] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Prithankar Pramanik
- Indian Association for the Cultivation of Science; Polymer Science Unit; 2A and 2B Raja S. C. Mullick Road Kolkata India 700032
| | - Suhrit Ghosh
- Indian Association for the Cultivation of Science; Polymer Science Unit; 2A and 2B Raja S. C. Mullick Road Kolkata India 700032
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Luo YL, Han M, Xu F, Chen YS, Zhang YQ. pH-Responsive H-Type PMAA2
-b
-HTPBN-b
-PMAA2
Four-Arm Star Block Copolymer Micelles for PTX Drug Release. Macromol Biosci 2015; 15:1411-22. [DOI: 10.1002/mabi.201500103] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 05/06/2015] [Indexed: 11/12/2022]
Affiliation(s)
- Yan-Ling Luo
- Key Laboratory of Macromolecular Science of Shaanxi Province; School of Chemistry & Chemical Engineering; Shaanxi Normal University; Xi'an 710062 People's Republic of China
| | - Mei Han
- Key Laboratory of Macromolecular Science of Shaanxi Province; School of Chemistry & Chemical Engineering; Shaanxi Normal University; Xi'an 710062 People's Republic of China
| | - Feng Xu
- Key Laboratory of Macromolecular Science of Shaanxi Province; School of Chemistry & Chemical Engineering; Shaanxi Normal University; Xi'an 710062 People's Republic of China
| | - Ya-Shao Chen
- Key Laboratory of Macromolecular Science of Shaanxi Province; School of Chemistry & Chemical Engineering; Shaanxi Normal University; Xi'an 710062 People's Republic of China
| | - Yong-Qin Zhang
- Key Laboratory of Macromolecular Science of Shaanxi Province; School of Chemistry & Chemical Engineering; Shaanxi Normal University; Xi'an 710062 People's Republic of China
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Fan X, Zhao K. Aggregation behavior and electrical properties of amphiphilic pyrrole-tailed ionic liquids in water, from the viewpoint of dielectric relaxation spectroscopy. SOFT MATTER 2014; 10:3259-3270. [PMID: 24626335 DOI: 10.1039/c3sm53143k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The self-aggregation behavior of amphiphilic pyrrole-tailed imidazolium ionic liquids (Py(CH₂)₁₂mim⁺Br⁻: Py = pyrrole, mim = methylimidazolium) in water is investigated by dielectric spectroscopy from 40 Hz to 110 MHz. Dielectric determination shows that the critical micelle concentration (CMC) is 8.5 mM, which is lower than that for traditional ionic surfactants. The thermodynamic parameter of the micellization, the Gibbs free energy ΔG, was calculated for Py(CH₂)₁₂mim⁺Br⁻ and compared to those of the corresponding C(n)mim⁺Br⁻ (n = 12, 14). It was found that the main driven forces of the Py(CH₂)₁₂mim⁺Br⁻ aggregation were hydrophobic interaction and π-π interactions among the adjacent Py groups. Further, the structure of aggregation was speculated theoretically that Py groups partially insert into the alkyl chains and the staggered arrangement in micelles is formed. When the concentration of Py(CH₂)₁₂mim⁺Br⁻ is higher than CMC, two remarkable relaxations which originated from diffusion of counterions and interfacial polarization between the micelles and solution, were observed at about 1.3 MHz and 55 MHz. The relaxation parameters representing the real properties of the whole system were obtained by fitting the experimental data with Cole-Cole equation. A dielectric model characterizing the structure and electrical properties of spherical micelles was proposed by which the conductivity, permittivity and the volume fraction of micelles as well as electrical properties of solution were calculated from the relaxation parameters. An intriguingly high permittivity of about 150 for the micelle was found to be a direct consequence of the strong orientational order of water molecules inside the core of micelle, and essentially is attributed to the special structure of the micelle. Furthermore, the calculation of the interfacial electrokinetic parameters of the micelles, i.e., the surface conductivity, surface charge density and zeta potential, were also achieved based on the relaxation parameters and phase parameters from higher frequency relaxation. On the basis of the results obtained, the aggregation behaviours and interfacial electrokinetic properties of the special micelles are discussed.
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Affiliation(s)
- Xiaoqing Fan
- College of Chemistry, Beijing Normal University, Beijing, China.
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8
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Cardoso AM, Calejo MT, Morais CM, Cardoso AL, Cruz R, Zhu K, Pedroso de Lima MC, Jurado AS, Nyström B. Application of Thermoresponsive PNIPAAM-b-PAMPTMA Diblock Copolymers in siRNA Delivery. Mol Pharm 2014; 11:819-27. [DOI: 10.1021/mp400510a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Ana M. Cardoso
- CNC−Centre
for Neurosciences and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
- Department
of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal
| | - M. Teresa Calejo
- Department
of Electronics and Communications Engineering, Tampere University of Technology, 33720 Tampere, Finland
| | - Catarina M. Morais
- CNC−Centre
for Neurosciences and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
- Department
of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal
| | - Ana L. Cardoso
- CNC−Centre
for Neurosciences and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
| | - Rita Cruz
- Department
of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal
| | - Kaizheng Zhu
- Department
of Chemistry, University of Oslo, 0313 Oslo, Norway
| | - Maria C. Pedroso de Lima
- CNC−Centre
for Neurosciences and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
- Department
of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal
| | - Amália S. Jurado
- CNC−Centre
for Neurosciences and Cell Biology, University of Coimbra, 3004-517 Coimbra, Portugal
- Department
of Life Sciences, University of Coimbra, 3004-517 Coimbra, Portugal
| | - Bo Nyström
- Department
of Chemistry, University of Oslo, 0313 Oslo, Norway
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Larsson E, Sanchez CC, Porsch C, Karabulut E, Wågberg L, Carlmark A. Thermo-responsive nanofibrillated cellulose by polyelectrolyte adsorption. Eur Polym J 2013. [DOI: 10.1016/j.eurpolymj.2013.05.023] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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10
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Han X, Zhang X, Zhu H, Yin Q, Liu H, Hu Y. Effect of composition of PDMAEMA-b-PAA block copolymers on their pH- and temperature-responsive behaviors. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:1024-1034. [PMID: 23289767 DOI: 10.1021/la3036874] [Citation(s) in RCA: 102] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
A series of poly(2-(dimethylamino) ethyl methacrylate) (PDMAEMA) homopolymers and poly(2-(dimethylamino)ethyl methacrylate)-b-poly(acrylic acid) (PDMAEMA-b-PAA) diblock copolymers were synthesized by atomic transfer radical polymerization. Thanks to a fine-tuning of the hydrophobic-hydrophilic balance by varying the molecular weight of the polymers and the pH of the aqueous solutions, as well as the composition for the block copolymers, the lower critical solution temperature (LCST) and the aggregation-dissolution kinetics of PDMAEMA homopolymers and PDMAEMA-b-PAA block copolymers can be adjusted. For the block copolymers, the results show that larger relative size of the PDMAEMA blocks leads to an increasing tendency to form micellar aggregates and a decrease of the LCST of the aqueous solution, which is consistent with the increasing copolymer hydrophobicity. A significant difference of the stimuli-responsive behavior between PDMAEMA-rich and PAA-rich copolymers is observed, because the former exhibit thermo-responsive behavior in a broad temperature range of 40-60 °C in basic media, while the pH-responsive behavior is dominant, and only a weak thermo-responsive behavior is exhibited around the specific isoelectric point (IEP) in the latter case. The aggregation rate is strongly influenced by temperature, molecular weight, structure, and composition of the polymer. Specifically, temperature has a stronger effect than the molar ratio of the PDMAEMA segment in the copolymer (related to its hydrophobicity) and the chain molecular weight, although the PDMAEMA-b-PAA copolymers show faster aggregation rate than do the PDMAEMA homopolymers.
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Affiliation(s)
- Xia Han
- Key Laboratory for Advanced Materials and Department of Chemistry, East China University of Science & Technology, Shanghai 200237, China
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