The Experts below are selected from a list of 14247 Experts worldwide ranked by ideXlab platform
Huanfu Zhou - One of the best experts on this subject based on the ideXlab platform.
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excellent temperature stability on Relative Permittivity and conductivity behavior of k0 5na0 5nbo3 based lead free ceramics
Journal of Alloys and Compounds, 2018Co-Authors: Xiuli Chen, Xiao Yan, Gaofeng Liu, Jie Sun, Huanfu ZhouAbstract:Abstract (1-x)K0.5Na0.5NbO3-xBi(Ni2/3Nb1/3)O3 [(1-x)KNN-xBNN] (x = 0.005, 0.0075, 0.01, 0.0125, 0.015) and (1-x)K0.5Na0.5NbO3-xBi(Ni0.75W0.25)O3 [(1-x)KNN-xBNW] (x = 0.005, 0.01, 0.015, 0.02) ceramics were prepared successfully via the conventional solid-state sintering method. The phase structure, dielectric properties, and conductivity behavior of ceramics were investigated. X-ray diffraction (XRD) patterns showed that both KNN-BNN and KNN-BNW had formed the solid solutions. The sintering behavior and dielectric properties could be enhanced with adding BNN and BNW. When x = 0.01, 0.99KNN-0.01BNN ceramics exhibited good properties with high Relative Permittivity er of ∼1657, small Δe/e132 °C ≤ ± 10% from 132 °C to 346 °C, low dielectric loss tanδ ≤0.037 from 132 °C to 415 °C. And for (1-x)KNN-xBNW, when x = 0.01, the excellent performances with er of ∼1590, Δe/e140 °C ≤ ± 15% from 140 °C to 350 °C, tanδ ≤ 0.04 from 140 °C to 411 °C were obtained in ceramics. The conductivity behavior shows that the defects and oxygen vacancies in material would provide the moving passage of a carrier.
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k0 5na0 5 nbo3 bi zn0 5zr0 5 o3 perovskite ceramics high Relative Permittivity low dielectric loss and good thermal stability
Ceramics International, 2015Co-Authors: Xiuli Chen, Huanfu Zhou, Guisheng Huang, Jie Chen, Liang FangAbstract:Abstract A novel lead-free perovskite ceramic system with the composition of (1− x )(K 0.5 Na 0.5 )NbO 3 – x Bi(Zn 0.5 Zr 0.5 )O 3 [(1− x )KNN– x BZZ, x =0–0.02] was developed. The effects of BZZ addition on the phase transition, microstructure and dielectric performances of KNN ceramic were systematically investigated. The BZZ addition can significantly enhance the Relative Permittivity and thermal stability of Permittivity of ceramics below the Curie temperature. When x =0.015, the ceramic possessed the optimized dielectric performance with small Δ e / e 115 °C value (≤±15%) and Relatively high Permittivity (~1500) over the temperature range from 115 to 343 °C. Moreover, the dielectric loss was dramatically reduced below 4.5% from room temperature to ~544 °C, which suggests that this ceramic is a candidate for high-temperature capacitor application.
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high Relative Permittivity low dielectric loss and good thermal stability of novel k0 5na0 5 nbo3 bi zn0 75w0 25 o3 solid solution
Materials Letters, 2015Co-Authors: Xiuli Chen, Guisheng Huang, Jie Chen, Liang Fang, Huanfu ZhouAbstract:Abstract (1− x )(K 0.5 Na 0.5 )NbO 3 – x Bi(Zn 0.75 W 0.25 )O 3 [(1− x )KNN– x BZW, 0≤ x ≤0.015] ceramics were prepared by a conventional solid state reaction method. The effects of BZW addition on the phase transition, microstructure and dielectric performances of KNN ceramics were systematically investigated. The temperature dependences of the Relative Permittivity illustrate that the small amount of BZW addition can effectively improve the temperature stability and Relative Permittivity of ceramics below the Curie temperature. As x =0.01, the ceramic showed superior dielectric temperature stability (±15%) and a Relatively high Permittivity (~1300) over the temperature range from 150 to 350 °C. In particular, the dielectric loss was prominently reduced below 5% from room temperature to ~470 °C, which suggests that this ceramic is a promising candidate for high-temperature capacitor application.
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high Relative Permittivity low dielectric loss and good thermal stability of batio3 bi mg0 5zr0 5 o3 solid solution
Ceramics International, 2015Co-Authors: Xiuli Chen, Jie Chen, Liang Fang, Huanfu ZhouAbstract:Abstract (1− x )BaTiO 3 - x Bi(Mg 0.5 Zr 0.5 )O 3 (BT-BMZ, x =0–0.1) ceramics were fabricated via a conventional solid-state reaction method. The phase transition, microstructure and dielectric performances of the composites were investigated. It is intriguing that the Relative Permittivity ( e r ) increased rapidly (>10 5 ) at phase transition temperature by adding small amounts of BMZ ( x =0.01). With further increasing BMZ content (0.06≤ x ≤0.1), e r was deteriorated slightly, however, the temperature independence of Permittivity was significantly improved (Δ e / e 200 °C
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thermally stable batio3 bi mg2 3nb1 3 o3 solid solution with high Relative Permittivity in a broad temperature usage range
Journal of the American Ceramic Society, 2015Co-Authors: Xiuli Chen, Jie Chen, Liang Fang, Huanfu ZhouAbstract:A combined X-ray diffraction (XRD), Raman spectra, X-ray photoelectron spectroscopy, Scanning electron microscopy, and dielectric characterization of (1–x)BaTiO3−xBi(Mg2/3Nb1/3)O3 ceramic system were investigated for compositions of 0 ≤ x ≤ 0.2. Single-phase perovskite-type XRD patterns were observed for all compositions. A systematically structural change from tetragonal to pseudocubic symmetry occurred at 0.04 Tm significantly ameliorated at x = 0.1: near-stable temperature coefficient of higher Relative Permittivity (~6800 ± 15%) and the corresponding loss tanδ ≤ 0.09 over a more broader temperature range of 25°C–240°C (1 kHz), which indicates that this ceramic is a promising dielectric material for elevated temperature dielectrics.
Xiuli Chen - One of the best experts on this subject based on the ideXlab platform.
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excellent temperature stability on Relative Permittivity and conductivity behavior of k0 5na0 5nbo3 based lead free ceramics
Journal of Alloys and Compounds, 2018Co-Authors: Xiuli Chen, Xiao Yan, Gaofeng Liu, Jie Sun, Huanfu ZhouAbstract:Abstract (1-x)K0.5Na0.5NbO3-xBi(Ni2/3Nb1/3)O3 [(1-x)KNN-xBNN] (x = 0.005, 0.0075, 0.01, 0.0125, 0.015) and (1-x)K0.5Na0.5NbO3-xBi(Ni0.75W0.25)O3 [(1-x)KNN-xBNW] (x = 0.005, 0.01, 0.015, 0.02) ceramics were prepared successfully via the conventional solid-state sintering method. The phase structure, dielectric properties, and conductivity behavior of ceramics were investigated. X-ray diffraction (XRD) patterns showed that both KNN-BNN and KNN-BNW had formed the solid solutions. The sintering behavior and dielectric properties could be enhanced with adding BNN and BNW. When x = 0.01, 0.99KNN-0.01BNN ceramics exhibited good properties with high Relative Permittivity er of ∼1657, small Δe/e132 °C ≤ ± 10% from 132 °C to 346 °C, low dielectric loss tanδ ≤0.037 from 132 °C to 415 °C. And for (1-x)KNN-xBNW, when x = 0.01, the excellent performances with er of ∼1590, Δe/e140 °C ≤ ± 15% from 140 °C to 350 °C, tanδ ≤ 0.04 from 140 °C to 411 °C were obtained in ceramics. The conductivity behavior shows that the defects and oxygen vacancies in material would provide the moving passage of a carrier.
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k0 5na0 5 nbo3 bi zn0 5zr0 5 o3 perovskite ceramics high Relative Permittivity low dielectric loss and good thermal stability
Ceramics International, 2015Co-Authors: Xiuli Chen, Huanfu Zhou, Guisheng Huang, Jie Chen, Liang FangAbstract:Abstract A novel lead-free perovskite ceramic system with the composition of (1− x )(K 0.5 Na 0.5 )NbO 3 – x Bi(Zn 0.5 Zr 0.5 )O 3 [(1− x )KNN– x BZZ, x =0–0.02] was developed. The effects of BZZ addition on the phase transition, microstructure and dielectric performances of KNN ceramic were systematically investigated. The BZZ addition can significantly enhance the Relative Permittivity and thermal stability of Permittivity of ceramics below the Curie temperature. When x =0.015, the ceramic possessed the optimized dielectric performance with small Δ e / e 115 °C value (≤±15%) and Relatively high Permittivity (~1500) over the temperature range from 115 to 343 °C. Moreover, the dielectric loss was dramatically reduced below 4.5% from room temperature to ~544 °C, which suggests that this ceramic is a candidate for high-temperature capacitor application.
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high Relative Permittivity low dielectric loss and good thermal stability of novel k0 5na0 5 nbo3 bi zn0 75w0 25 o3 solid solution
Materials Letters, 2015Co-Authors: Xiuli Chen, Guisheng Huang, Jie Chen, Liang Fang, Huanfu ZhouAbstract:Abstract (1− x )(K 0.5 Na 0.5 )NbO 3 – x Bi(Zn 0.75 W 0.25 )O 3 [(1− x )KNN– x BZW, 0≤ x ≤0.015] ceramics were prepared by a conventional solid state reaction method. The effects of BZW addition on the phase transition, microstructure and dielectric performances of KNN ceramics were systematically investigated. The temperature dependences of the Relative Permittivity illustrate that the small amount of BZW addition can effectively improve the temperature stability and Relative Permittivity of ceramics below the Curie temperature. As x =0.01, the ceramic showed superior dielectric temperature stability (±15%) and a Relatively high Permittivity (~1300) over the temperature range from 150 to 350 °C. In particular, the dielectric loss was prominently reduced below 5% from room temperature to ~470 °C, which suggests that this ceramic is a promising candidate for high-temperature capacitor application.
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high Relative Permittivity low dielectric loss and good thermal stability of batio3 bi mg0 5zr0 5 o3 solid solution
Ceramics International, 2015Co-Authors: Xiuli Chen, Jie Chen, Liang Fang, Huanfu ZhouAbstract:Abstract (1− x )BaTiO 3 - x Bi(Mg 0.5 Zr 0.5 )O 3 (BT-BMZ, x =0–0.1) ceramics were fabricated via a conventional solid-state reaction method. The phase transition, microstructure and dielectric performances of the composites were investigated. It is intriguing that the Relative Permittivity ( e r ) increased rapidly (>10 5 ) at phase transition temperature by adding small amounts of BMZ ( x =0.01). With further increasing BMZ content (0.06≤ x ≤0.1), e r was deteriorated slightly, however, the temperature independence of Permittivity was significantly improved (Δ e / e 200 °C
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thermally stable batio3 bi mg2 3nb1 3 o3 solid solution with high Relative Permittivity in a broad temperature usage range
Journal of the American Ceramic Society, 2015Co-Authors: Xiuli Chen, Jie Chen, Liang Fang, Huanfu ZhouAbstract:A combined X-ray diffraction (XRD), Raman spectra, X-ray photoelectron spectroscopy, Scanning electron microscopy, and dielectric characterization of (1–x)BaTiO3−xBi(Mg2/3Nb1/3)O3 ceramic system were investigated for compositions of 0 ≤ x ≤ 0.2. Single-phase perovskite-type XRD patterns were observed for all compositions. A systematically structural change from tetragonal to pseudocubic symmetry occurred at 0.04 Tm significantly ameliorated at x = 0.1: near-stable temperature coefficient of higher Relative Permittivity (~6800 ± 15%) and the corresponding loss tanδ ≤ 0.09 over a more broader temperature range of 25°C–240°C (1 kHz), which indicates that this ceramic is a promising dielectric material for elevated temperature dielectrics.
Liang Fang - One of the best experts on this subject based on the ideXlab platform.
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k0 5na0 5 nbo3 bi zn0 5zr0 5 o3 perovskite ceramics high Relative Permittivity low dielectric loss and good thermal stability
Ceramics International, 2015Co-Authors: Xiuli Chen, Huanfu Zhou, Guisheng Huang, Jie Chen, Liang FangAbstract:Abstract A novel lead-free perovskite ceramic system with the composition of (1− x )(K 0.5 Na 0.5 )NbO 3 – x Bi(Zn 0.5 Zr 0.5 )O 3 [(1− x )KNN– x BZZ, x =0–0.02] was developed. The effects of BZZ addition on the phase transition, microstructure and dielectric performances of KNN ceramic were systematically investigated. The BZZ addition can significantly enhance the Relative Permittivity and thermal stability of Permittivity of ceramics below the Curie temperature. When x =0.015, the ceramic possessed the optimized dielectric performance with small Δ e / e 115 °C value (≤±15%) and Relatively high Permittivity (~1500) over the temperature range from 115 to 343 °C. Moreover, the dielectric loss was dramatically reduced below 4.5% from room temperature to ~544 °C, which suggests that this ceramic is a candidate for high-temperature capacitor application.
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high Relative Permittivity low dielectric loss and good thermal stability of novel k0 5na0 5 nbo3 bi zn0 75w0 25 o3 solid solution
Materials Letters, 2015Co-Authors: Xiuli Chen, Guisheng Huang, Jie Chen, Liang Fang, Huanfu ZhouAbstract:Abstract (1− x )(K 0.5 Na 0.5 )NbO 3 – x Bi(Zn 0.75 W 0.25 )O 3 [(1− x )KNN– x BZW, 0≤ x ≤0.015] ceramics were prepared by a conventional solid state reaction method. The effects of BZW addition on the phase transition, microstructure and dielectric performances of KNN ceramics were systematically investigated. The temperature dependences of the Relative Permittivity illustrate that the small amount of BZW addition can effectively improve the temperature stability and Relative Permittivity of ceramics below the Curie temperature. As x =0.01, the ceramic showed superior dielectric temperature stability (±15%) and a Relatively high Permittivity (~1300) over the temperature range from 150 to 350 °C. In particular, the dielectric loss was prominently reduced below 5% from room temperature to ~470 °C, which suggests that this ceramic is a promising candidate for high-temperature capacitor application.
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high Relative Permittivity low dielectric loss and good thermal stability of batio3 bi mg0 5zr0 5 o3 solid solution
Ceramics International, 2015Co-Authors: Xiuli Chen, Jie Chen, Liang Fang, Huanfu ZhouAbstract:Abstract (1− x )BaTiO 3 - x Bi(Mg 0.5 Zr 0.5 )O 3 (BT-BMZ, x =0–0.1) ceramics were fabricated via a conventional solid-state reaction method. The phase transition, microstructure and dielectric performances of the composites were investigated. It is intriguing that the Relative Permittivity ( e r ) increased rapidly (>10 5 ) at phase transition temperature by adding small amounts of BMZ ( x =0.01). With further increasing BMZ content (0.06≤ x ≤0.1), e r was deteriorated slightly, however, the temperature independence of Permittivity was significantly improved (Δ e / e 200 °C
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thermally stable batio3 bi mg2 3nb1 3 o3 solid solution with high Relative Permittivity in a broad temperature usage range
Journal of the American Ceramic Society, 2015Co-Authors: Xiuli Chen, Jie Chen, Liang Fang, Huanfu ZhouAbstract:A combined X-ray diffraction (XRD), Raman spectra, X-ray photoelectron spectroscopy, Scanning electron microscopy, and dielectric characterization of (1–x)BaTiO3−xBi(Mg2/3Nb1/3)O3 ceramic system were investigated for compositions of 0 ≤ x ≤ 0.2. Single-phase perovskite-type XRD patterns were observed for all compositions. A systematically structural change from tetragonal to pseudocubic symmetry occurred at 0.04 Tm significantly ameliorated at x = 0.1: near-stable temperature coefficient of higher Relative Permittivity (~6800 ± 15%) and the corresponding loss tanδ ≤ 0.09 over a more broader temperature range of 25°C–240°C (1 kHz), which indicates that this ceramic is a promising dielectric material for elevated temperature dielectrics.
Jie Chen - One of the best experts on this subject based on the ideXlab platform.
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k0 5na0 5 nbo3 bi zn0 5zr0 5 o3 perovskite ceramics high Relative Permittivity low dielectric loss and good thermal stability
Ceramics International, 2015Co-Authors: Xiuli Chen, Huanfu Zhou, Guisheng Huang, Jie Chen, Liang FangAbstract:Abstract A novel lead-free perovskite ceramic system with the composition of (1− x )(K 0.5 Na 0.5 )NbO 3 – x Bi(Zn 0.5 Zr 0.5 )O 3 [(1− x )KNN– x BZZ, x =0–0.02] was developed. The effects of BZZ addition on the phase transition, microstructure and dielectric performances of KNN ceramic were systematically investigated. The BZZ addition can significantly enhance the Relative Permittivity and thermal stability of Permittivity of ceramics below the Curie temperature. When x =0.015, the ceramic possessed the optimized dielectric performance with small Δ e / e 115 °C value (≤±15%) and Relatively high Permittivity (~1500) over the temperature range from 115 to 343 °C. Moreover, the dielectric loss was dramatically reduced below 4.5% from room temperature to ~544 °C, which suggests that this ceramic is a candidate for high-temperature capacitor application.
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high Relative Permittivity low dielectric loss and good thermal stability of novel k0 5na0 5 nbo3 bi zn0 75w0 25 o3 solid solution
Materials Letters, 2015Co-Authors: Xiuli Chen, Guisheng Huang, Jie Chen, Liang Fang, Huanfu ZhouAbstract:Abstract (1− x )(K 0.5 Na 0.5 )NbO 3 – x Bi(Zn 0.75 W 0.25 )O 3 [(1− x )KNN– x BZW, 0≤ x ≤0.015] ceramics were prepared by a conventional solid state reaction method. The effects of BZW addition on the phase transition, microstructure and dielectric performances of KNN ceramics were systematically investigated. The temperature dependences of the Relative Permittivity illustrate that the small amount of BZW addition can effectively improve the temperature stability and Relative Permittivity of ceramics below the Curie temperature. As x =0.01, the ceramic showed superior dielectric temperature stability (±15%) and a Relatively high Permittivity (~1300) over the temperature range from 150 to 350 °C. In particular, the dielectric loss was prominently reduced below 5% from room temperature to ~470 °C, which suggests that this ceramic is a promising candidate for high-temperature capacitor application.
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high Relative Permittivity low dielectric loss and good thermal stability of batio3 bi mg0 5zr0 5 o3 solid solution
Ceramics International, 2015Co-Authors: Xiuli Chen, Jie Chen, Liang Fang, Huanfu ZhouAbstract:Abstract (1− x )BaTiO 3 - x Bi(Mg 0.5 Zr 0.5 )O 3 (BT-BMZ, x =0–0.1) ceramics were fabricated via a conventional solid-state reaction method. The phase transition, microstructure and dielectric performances of the composites were investigated. It is intriguing that the Relative Permittivity ( e r ) increased rapidly (>10 5 ) at phase transition temperature by adding small amounts of BMZ ( x =0.01). With further increasing BMZ content (0.06≤ x ≤0.1), e r was deteriorated slightly, however, the temperature independence of Permittivity was significantly improved (Δ e / e 200 °C
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thermally stable batio3 bi mg2 3nb1 3 o3 solid solution with high Relative Permittivity in a broad temperature usage range
Journal of the American Ceramic Society, 2015Co-Authors: Xiuli Chen, Jie Chen, Liang Fang, Huanfu ZhouAbstract:A combined X-ray diffraction (XRD), Raman spectra, X-ray photoelectron spectroscopy, Scanning electron microscopy, and dielectric characterization of (1–x)BaTiO3−xBi(Mg2/3Nb1/3)O3 ceramic system were investigated for compositions of 0 ≤ x ≤ 0.2. Single-phase perovskite-type XRD patterns were observed for all compositions. A systematically structural change from tetragonal to pseudocubic symmetry occurred at 0.04 Tm significantly ameliorated at x = 0.1: near-stable temperature coefficient of higher Relative Permittivity (~6800 ± 15%) and the corresponding loss tanδ ≤ 0.09 over a more broader temperature range of 25°C–240°C (1 kHz), which indicates that this ceramic is a promising dielectric material for elevated temperature dielectrics.
Geoffrey M Geise - One of the best experts on this subject based on the ideXlab platform.
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influence of salt concentration on hydrated polymer Relative Permittivity and state of water properties
Macromolecules, 2021Co-Authors: Kevin Chang, Hongxi Luo, Geoffrey M GeiseAbstract:Little is known about how aqueous electrolyte exposure affects hydrated polymer Relative Permittivity and state of water properties. Increasing NaCl solution concentration (0.01, 0.1, and 1.0 mol/L) caused a cross-linked glycidyl and glycerol methacrylate-based copolymer to osmotically deswell and caused ion sorption to increase opposite to electrostatic theory and Maxwell Garnett equation predictions. The presence, due to salt solution equilibration, of ions in the polymer drove an increase in static Permittivity compared to that of pure water-equilibrated equivalent water content samples. The influence of salt concentration on hydrated polymer dielectric Permittivity properties was fundamentally different from its influence on aqueous electrolyte solutions where dielectric Permittivity decreases as salt concentration increases. Generally, the amount of bulk-like water in the polymers decreased as salt concentration increased, but a maximum was observed in low water content (<7% by mass) polymers, suggesting that ions and water may compete for interactions with the polymer.
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influence of salt concentration on hydrated polymer Relative Permittivity and state of water properties
Macromolecules, 2021Co-Authors: Kevin Chang, Hongxi Luo, Geoffrey M GeiseAbstract:Little is known about how aqueous electrolyte exposure affects hydrated polymer Relative Permittivity and state of water properties. Increasing NaCl solution concentration (0.01, 0.1, and 1.0 mol/L...
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water content Relative Permittivity and ion sorption properties of polymers for membrane desalination
Journal of Membrane Science, 2019Co-Authors: Kevin Chang, Hongxi Luo, Geoffrey M GeiseAbstract:Abstract The interplay of polymer water content, dielectric Relative Permittivity, and ion sorption properties was studied using a cross-linked poly(glycidyl methacrylate) (XL-pGMA) polymer. The water content of the base XL-pGMA polymer was increased, by partial hydrolysis of the epoxide ring on the polymer side chain, to prepare a series of hydrolyzed XL-pGMA materials. Microwave dielectric spectroscopy, performed from 45 MHz to 26.5 GHz, revealed lower Relative Permittivity at a given water content compared to Nafion® 117. This observation suggests that knowledge of polymer water content alone may be insufficient for estimating Relative Permittivity properties of hydrated polymers. State of water analysis suggested that (for polymers that contain similar total amounts of sorbed water) more water in hydrolyzed XL-pGMA interacts with the polymer compared to that in Nafion® 117, and this result may be related to the observed differences in the Relative Permittivity properties of the two materials. The hydrolyzed polymers were more water/ion sorption selective, important for desalination applications, compared to many uncharged materials reported in the literature but less selective compared to Nafion® 117. Membrane phase mean ionic activity coefficients suggest that Nafion® 117 is more thermodynamically ideal (i.e., the mean ionic activity coefficients are closer to unity) than the hydrolyzed XL-pGMA materials, and thus, ion exclusion in Nafion® 117 is primarily due to Donnan exclusion. Measured static Relative Permittivity values were used to estimate, via electrostatic theory, the free energy barrier for ion sorption in each material, and these values were qualitatively consistent with values determined using measured ion sorption data. This study suggests that polymer chemistry, not water content alone, influences the Relative Permittivity properties of hydrated polymers and that Relative Permittivity measurements can provide qualitative insight into ion sorption properties, which is important for designing advanced desalination membranes.
