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  1. AU="Chang, Chao-Wen"
  2. AU="BENDICH, A"
  3. AU="Battista, Brad"
  4. AU="Xiong, Bing"
  5. AU="Alexandra Griffith"
  6. AU="Kawamura, Junpei"
  7. AU="Lyons, Karen M"
  8. AU="Biemans, Barbara"

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  1. Artikel ; Online: Accelerating Solvent Selection for Type II Porous Liquids.

    Chang, Chao-Wen / Borne, Isaiah / Lawler, Robin M / Yu, Zhenzi / Jang, Seung Soon / Lively, Ryan P / Sholl, David S

    Journal of the American Chemical Society

    2022  Band 144, Heft 9, Seite(n) 4071–4079

    Abstract: Type II porous liquids, comprising intrinsically porous molecules dissolved in a liquid solvent, potentially combine the adsorption properties of porous adsorbents with the handling advantages of liquids. Previously, discovery of appropriate solvents to ... ...

    Abstract Type II porous liquids, comprising intrinsically porous molecules dissolved in a liquid solvent, potentially combine the adsorption properties of porous adsorbents with the handling advantages of liquids. Previously, discovery of appropriate solvents to make porous liquids had been limited to direct experimental tests. We demonstrate an efficient screening approach for this task that uses COSMO-RS calculations, predictions of solvent p
    Mesh-Begriff(e) Porosity ; Solubility ; Solvents
    Chemische Substanzen Solvents
    Sprache Englisch
    Erscheinungsdatum 2022-02-16
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.1c13049
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel: Accelerating Solvent Selection for Type II Porous Liquids

    Chang, Chao-Wen / Borne, Isaiah / Lawler, Robin M. / Yu, Zhenzi / Jang, Seung Soon / Lively, Ryan P. / Sholl, David S.

    Journal of the American Chemical Society. 2022 Feb. 16, v. 144, no. 9

    2022  

    Abstract: Type II porous liquids, comprising intrinsically porous molecules dissolved in a liquid solvent, potentially combine the adsorption properties of porous adsorbents with the handling advantages of liquids. Previously, discovery of appropriate solvents to ... ...

    Abstract Type II porous liquids, comprising intrinsically porous molecules dissolved in a liquid solvent, potentially combine the adsorption properties of porous adsorbents with the handling advantages of liquids. Previously, discovery of appropriate solvents to make porous liquids had been limited to direct experimental tests. We demonstrate an efficient screening approach for this task that uses COSMO-RS calculations, predictions of solvent pKₐ values from a machine-learning model, and several other features and apply this approach to select solvents from a library of more than 11,000 compounds. This method is shown to give qualitative agreement with experimental observations for two molecular cages, CC13 and TG-TFB-CHEDA, identifying solvents with higher solubility for these molecules than had previously been known. Ultimately, the algorithm streamlines the downselection of suitable solvents for porous organic cages to enable more rapid discovery of Type II porous liquids.
    Schlagwörter adsorbents ; adsorption ; algorithms ; artificial intelligence ; liquids ; models ; solubility ; solvents
    Sprache Englisch
    Erscheinungsverlauf 2022-0216
    Umfang p. 4071-4079.
    Erscheinungsort American Chemical Society
    Dokumenttyp Artikel
    ZDB-ID 3155-0
    ISSN 1520-5126 ; 0002-7863
    ISSN (online) 1520-5126
    ISSN 0002-7863
    DOI 10.1021/jacs.1c13049
    Datenquelle NAL Katalog (AGRICOLA)

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  3. Artikel ; Online: A novel software-defined network packet security tunnel forwarding mechanism.

    Zuo, Zhi Bin / He, Rong Yu / Zhu, Xian Wei / Chang, Chao Wen

    Mathematical biosciences and engineering : MBE

    2019  Band 16, Heft 5, Seite(n) 4359–4381

    Abstract: The OpenFlow protocol match field capacity is fixed and limited, and packet forwarding in software-defined network lacks valid authentication of data source, integrity verification, and confidentiality protection mechanism. OpenFlow only supports the ... ...

    Abstract The OpenFlow protocol match field capacity is fixed and limited, and packet forwarding in software-defined network lacks valid authentication of data source, integrity verification, and confidentiality protection mechanism. OpenFlow only supports the MPLS label tunnel establishment, and therefore cannot establish a secure tunnel flexibly. In order to solve these problems, we propose P4Sec, a novel software-defined network packet security tunnel forwarding mechanism. As P4 allows the data plane to be reprogrammed to realize the characteristics of packet forwarding, we build a software-defined network security tunnel to prevent data malicious tampering, stealing, forgery and other malicious network behavior, implementing packet routing and forwarding based on gateway identity. Finally, we construct a P4Sec prototype system based on the software switch BMv2, verify the effectiveness of the mechanism through experimental analysis, and evaluate the overhead of the mechanism. The results demonstrate that P4Sec security mechanism ensure the authenticity, integrity, and confidentiality of forwarded data, and realize the secure forwarding requirements of data packets in software-defined network.
    Sprache Englisch
    Erscheinungsdatum 2019-09-09
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 1551-0018
    ISSN (online) 1551-0018
    DOI 10.3934/mbe.2019217
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  4. Artikel ; Online: A prospect of cost-effective handling and transportation of graphene oxides: folding and redispersion of graphene oxide microsheets.

    Chang, Chao-Wen / Zamani, Somayeh / Smilgies, Detlef M / Seo, Honguk / Park, Sangjoon / Kang, Taechung / Lim, Ae Ran / Joo, Yong Lak

    Nanotechnology

    2021  Band 32, Heft 45

    Abstract: Controlling the assembly of 2D materials such as graphene oxides (GO) has a significant impact on their properties and performance. One of the critical issues on the processing and handling of GO is that they need to be in dilution solution (0.5 to 2.5 ... ...

    Abstract Controlling the assembly of 2D materials such as graphene oxides (GO) has a significant impact on their properties and performance. One of the critical issues on the processing and handling of GO is that they need to be in dilution solution (0.5 to 2.5 wt%) to maintain their high degree of exfoliation and dispersion. As a result, the shipment of GO in large quantity involves a huge volume of solvent (water) and thus the transportation costs for large sales volume would become extremely high. Through cross-sectional scanning electron microscopy and polarized optical microscopy together with x-ray diffraction and small-angle x-ray scattering studies, we demonstrated that the assembly and structure of GO microsheets can be preserved without restacking, when assembled GO via water-based wet spinning are re-dispersed into solution. A couple of alkyl ammonium bromides, CTAB and TBAB, as well as NaOH, were examined as coagulants and the resulting fibers were redispersed in an aqueous solution. The redispersed solution of fibers that were wet-spun into the commonly used CTAB and TBAB coagulation baths, maintained their physico-chemical properties (similar to the original GO dispersion) however, did not reveal preservation of liquid crystallinity. Meanwhile, the redispersed fibers that were initially spun into NaOH coagulation bath were able to maintain their liquid crystallinity if the lateral size of the GO sheets was large. Based on these findings, a cost-effective solid handling approach is devised which involves (i) processing GO microsheets in solution into folded layers in solid-state, (ii) transporting assembled GO to the customers, and (iii) redispersion of folded GO into a solution for their use. The proposed solid handling of GO followed by redispersion into solution can greatly reduce the transportation costs of graphene oxide materials by reducing the transportation volume by more than 90%.
    Sprache Englisch
    Erscheinungsdatum 2021-08-17
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 1362365-5
    ISSN 1361-6528 ; 0957-4484
    ISSN (online) 1361-6528
    ISSN 0957-4484
    DOI 10.1088/1361-6528/ac1755
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  5. Artikel: Ultralight graphene/graphite hybrid fibers via entirely water-based processes and their application to density-controlled, high performance composites

    Zamani, Somayeh / Won, Jong Sung / Salim, Muhammad / AlAmer, Mohammed / Chang, Chao-wen / Kumar, Pardeep / Amponsah, Kwame / Lim, Ae Ran / Joo, Yong Lak

    Carbon. 2021 Mar., v. 173

    2021  

    Abstract: Fabrication of lightweight graphene/graphite fibers (GFs) with high thermal and electrical conductivity, and good mechanical properties via facile processing method is yet a challenge for industries. The common fabrication of reduced graphene oxide ... ...

    Abstract Fabrication of lightweight graphene/graphite fibers (GFs) with high thermal and electrical conductivity, and good mechanical properties via facile processing method is yet a challenge for industries. The common fabrication of reduced graphene oxide fibers originated from graphite, requires several cost-intensive steps of oxidation and reduction and still, exceptional thermal and electrical conductivity and stiffness of the graphene sheet as a single layer, has not been translated in such fibers. We report the fabrication of ultralight graphene/graphite fibers with the density of 0.25 g/cm³, and an exceptional thermal and electrical conductivity of 2✕10³ W/K-m and 2✕10⁵ S/m, respectively as well as impressive mechanical properties of ∼0.5 GPa strength and 40 GPa Young’s modulus via entirely water based process, from achieving exfoliation of graphite through assembling into fibers. Furthermore, the resulting ultralight high performance GFs have been incorporated into epoxy resin, producing self-floating, lightweight composites with enhanced electrical and mechanical properties.
    Schlagwörter electrical conductivity ; epoxides ; graphene ; graphene oxide ; oxidation
    Sprache Englisch
    Erscheinungsverlauf 2021-03
    Umfang p. 880-890.
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    Anmerkung NAL-AP-2-clean
    ISSN 0008-6223
    DOI 10.1016/j.carbon.2020.11.079
    Datenquelle NAL Katalog (AGRICOLA)

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  6. Artikel: Polymorphism/pseudopolymorphism of metal–organic frameworks composed of zinc(ii) and 2-methylimidazole: synthesis, stability, and application in gas storage

    Lo, Yang / Lam, Chon Hei / Chang, Chao-Wen / Yang, An-Chih / Kang, Dun-Yen

    RSC advances. 2016 Sept. 20, v. 6, no. 92

    2016  

    Abstract: This paper reports on the synthesis and stability of a polymorphic system of a metal–organic framework (MOF) composed of zinc(ii) and 2-methylimidazole, as well as its potential applicability in gas storage. Three polymorphs/pseudopolymorphs, ZIF-8, ZIF- ... ...

    Abstract This paper reports on the synthesis and stability of a polymorphic system of a metal–organic framework (MOF) composed of zinc(ii) and 2-methylimidazole, as well as its potential applicability in gas storage. Three polymorphs/pseudopolymorphs, ZIF-8, ZIF-L, and dia(Zn), are discussed in this work. It was found that the synthesis of dia(Zn) with a crystal morphology of hexagonal nanosheets requires a catalyst (NH4OH, CH3COOH, or HCOONa), and a synthesis temperature of 60 °C. In contrast, the synthesis of ZIF-8 and ZIF-L can be conducted in the absence of a catalyst and at room temperature. This suggests that the activation energy of dia(Zn) exceeds that of ZIF-8 and ZIF-L. The three crystals were subjected to hydrothermal treatment at 100 °C to evaluate their stability. ZIF-8 presented the highest hydrothermal stability, whereas ZIF-L presented the lowest. Nitrogen physisorption performed at 77 K suggests that the microporosity of ZIF-8 exceeds that of ZIF-L and dia(Zn), which were almost nonporous. Interestingly, CO2 thermogravimetric analysis revealed that the CO2 adsorption of ZIF-L and dia(Zn) at 323.15 K is on par with that of ZIF-8, which implies that the flexibility of the ZIF-L and dia(Zn) framework increased considerably with temperature. Our results suggest that nonporous MOFs might be useful for gas adsorption or gas separation at ambient or high temperature.
    Schlagwörter acetic acid ; activation energy ; adsorption ; ambient temperature ; ammonium hydroxide ; carbon dioxide ; catalysts ; coordination polymers ; crystals ; hot water treatment ; nanosheets ; nitrogen ; thermogravimetry ; zinc
    Sprache Englisch
    Erscheinungsverlauf 2016-0920
    Umfang p. 89148-89156.
    Erscheinungsort The Royal Society of Chemistry
    Dokumenttyp Artikel
    ISSN 2046-2069
    DOI 10.1039/c6ra19437k
    Datenquelle NAL Katalog (AGRICOLA)

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  7. Artikel: Vapor-phase synthesis of poly(p-xylylene) membranes for gas separations

    Chang, Chao-Wen / Dun-Yen Kang / Hsien-Yeh Chen / Li-Wei Lee / Ming-Yang Kan / Zhen-Yu Guan

    Journal of membrane science. 2017 Oct. 01, v. 539

    2017  

    Abstract: We report a vapor-phase deposition of poly(p-xylylene) (parylene) membranes for gas separations. Three parylene membranes, poly[(2-chloro-p-xylylene)] (parylene C), poly[(4-amino-p-xylylene)-co-(p-xylylene)] (parylene A), and poly[(2-carboxylic acid N- ... ...

    Abstract We report a vapor-phase deposition of poly(p-xylylene) (parylene) membranes for gas separations. Three parylene membranes, poly[(2-chloro-p-xylylene)] (parylene C), poly[(4-amino-p-xylylene)-co-(p-xylylene)] (parylene A), and poly[(2-carboxylic acid N-hydroxysuccinimide ester)-co-(p-xylylene)] (parylene NHS ester), were evaluated. These membranes were deposited on a support of porous poly(vinylidene fluoride) with a dense layer of poly(vinyl alcohol) cast on its top surface. The as-synthesized parylene membranes were characterized by scanning electron microscopy, FT-IR spectroscopy, and the measurements of water contact angle. Single-gas permeation with hydrogen, nitrogen, methane, and carbon dioxide was performed on the parylene membranes for assessing their molecular transport properties. These parylene membranes showed gas permeability of up to hundreds of barrer. To further enhance the gas separation performance of the parylene membranes, polyethylenimine (PEI) was used for modifying the surface of the membranes composed of parylene NHS ester.
    Schlagwörter artificial membranes ; carbon dioxide ; contact angle ; fluorides ; Fourier transform infrared spectroscopy ; hydrogen ; methane ; nitrogen ; permeability ; polyethyleneimine ; polyvinyl alcohol ; scanning electron microscopy ; thermoplastics
    Sprache Englisch
    Erscheinungsverlauf 2017-1001
    Umfang p. 101-107.
    Erscheinungsort Elsevier B.V.
    Dokumenttyp Artikel
    ZDB-ID 194516-6
    ISSN 0376-7388
    ISSN 0376-7388
    DOI 10.1016/j.memsci.2017.05.058
    Datenquelle NAL Katalog (AGRICOLA)

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