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Ultra-transparent nanostructured coatings via flow-induced one-step coassembly

Nano Materials Science 2022年第2期4卷 97-103页

作者： Jingjing Liu Sonia E.Chavez Hao Ding Maria M.Farooqui Zaili Hou Sharon Lin Thomas D.D'Auria Julia M.Kennedy Anna Marie LaChance Luyi Sun Polymer Program Institute of Materials ScienceUniversity of ConnecticutStorrsConnecticut06269United States Department of Chemical&Biomolecular Engineering University of ConnecticutStorrsConnecticut06269United States Department of Biomedical Engineering University of ConnecticutStorrsConnecticut06269United States

Polyvinyl alcohol(PVA)/laponite(LP)nanocomposite coatings were fabricated via a facile one-step coassembly *** formed nanocoatings contain a high concentration of LP nanosheets,which can be well aligned along the substrate surface during the coassembly *** to the highly orientated structure,the flexible nanocoatings exhibit ultra-high transparency and superior mechanical properties,and can also act as excellent gas *** nanocoatings can be exceptional candidates for a variety of applications,such as food packaging.

关键词： Nanocoating Coassembly Polyvinyl alcohol Laponite

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Bio-inspired Smart Composites with Multi-scale Architecture and Surface engineering 23

Bio-inspired Smart Composites with Multi-scale Architecture ...

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23rd International Conference on Composite Materials, ICCM 2023

作者： Zeng, Songshan Shen, Kuangyu Li, Rui Smith, Andrew Zhang, Dianyun Sun, Luyi Polymer Program Institute of Materials Science Department of Chemical & Biomolecular Engineering University of Connecticut United States

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Smart Soft Materials with Multiscale Architecture and Dynamic Surface Topographies

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Accounts of Materials Research 2022年第11期3卷 1115-1126页

作者： Songshan Zeng Andrew T.Smith Kuangyu Shen Luyi Sun Polymer Program Institute of Materials Science and Department of Chemical&Biomolecular EngineeringUniversity of ConnecticutStorrsConnecticut 06269United StatesPresent Address:Macao Institute of Materials Science and Engineering(MIMSE)Zhuhai MUST Science and Technology Research InstituteFaculty of Innovation EngineeringMacao University of Science and TechnologyTaipa999078MacaoChina Polymer Program Institute of Materials Science and Department of Chemical&Biomolecular EngineeringUniversity of ConnecticutStorrsConnecticut 06269United States

CONSPECTUS:Smart soft materials have one or more characteristics that can be significantly altered in convertible fashions by external stimuli,such as light,moisture,mechanical force,temperature,electric/magnetic fields,pH,and so *** materials can lead to widespread application in multifunctional smart ***,various smart soft materials have been developed under the inspiration of the intriguing multiscale structures,adaptive mechanisms,and dynamic responses of natural life,with an aim to further design advanced material systems with novel,intriguing,and unprecedented properties.

关键词： Smart properties. Dynamic

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A breathing A4 paper by in situ growth of green metal-organic frameworks for air freshening and cleaning

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Chinese Journal of chemical engineering 2022年第12期52卷 95-102页

作者： Bo Zhang Hongwen Chen Liming Jiang Youqing Shen Dan Zhao Zhuxian Zhou Key Laboratory of Biomass Chemical Engineering of Ministry of Education and Zhejiang Key Laboratory of Smart Biomaterials College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027China Department of Polymer Science and Engineering Zhejiang UniversityHangzhou 310027China Department of Chemical&Biomolecular Engineering National University of Singapore117585Singapore Hangzhou Global Scientific and Technological Innovation Center Zhejiang UniversityHangzhou 311215China

Surface modification of natural cellulose fibers with nanomaterials is an effective strategy for producing functional textiles for multiple applications.A4-sized printing paper is a commonly used,cheap,and easily acquirable office supply which is mainly made of cellulose ***,we report green and simple nanofabrication of A4 paper to endow it with high capability for fragrance encapsulation and sustained release,and strong adsorption to indoor air *** method utilizes the sugar molecule of cellulose for in-situ growth ofγ-cyclodextrin(γ-CD)metal-organic frameworks(MOFs)on A4 *** obtainedγ-CD-MOF/A4 nanocomposites have superior specific surface area and high porous ***γ-CD-MOF/A4 nanocomposites can effectively encapsulate fragrant molecules through host-guest ***γ-CD-MOF/A4 nanocomposites also show strong absorption capability to formaldehyde and carbon dioxide through the formation of hydrogen bonding and chemical ***γ-CD-MOF/A4nanocomposites combine the advantages of both A4 paper andγ-CD-MOF,which can be used in indoor air freshening and cleaning.

关键词： Metal-organic frameworks A4 printing paper In situ synthesis Fragrance encapsulation Formaldehyde removal Carbon dioxide capture

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Scaled-up synthesis of defect-rich layered double hydroxide monolayers without organic species for efficient oxygen evolution reaction

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Green Energy & Environment 2022年第5期7卷 975-982页

作者： Haoyuan Chi Jingwen Dong Tian Li Sha Bai Ling Tan Jikang Wang Tianyang Shen Guihao Liu Lihong Liu Luyi Sun Yufei Zhao Yu-Fei Song State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical TechnologyBeijing100029China College of Chemistry Key Laboratory of Theoretical&Computational Photochemistry of Ministry of EducationBeijing Normal UniversityBeijing100875China Polymer Program Institute of Materials Science and Department of Chemical&Biomolecular EngineeringUniversity of ConnecticutStorrsConnecticut06269USA Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing100029China

The scaled-up synthesis of organic-free monolayer nanomaterials is highly desirable,especially in obtaining green energy by *** this study,a method for the scaled-up synthesis of the series of monolayer layered double hydroxides(LDHs)without the addition of organic solvents is reported via the separate nucleation and aging steps *** resulting monolayer LDHs with the thicknesses of less than 1 nm showed a narrow thickness distribution.X-ray absorption fine-structure revealed that monolayer NiFe-LDH nanosheets have a number of oxygen and metal vacancies *** a practical application,monolayer NiFe-LDH nanosheets containing defects showed an enhanced electrocatalytic water oxidation activity compared with that of bulk *** functional theory calculations uncovered that excellent catalytic activity is attributed to vacancies *** proposed method is an economical and universally applicable strategy for the scaled-up production of monolayer LDHs.

关键词： process synthesis monolayer

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Assembly of exfoliated α-zirconium phosphate nanosheets:Mechanisms and versatile applications

Aggregate

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Aggregate 2022年第4期3卷 41-60页

作者： Hao Ding Abbas Ahmed Kuangyu Shen Luyi Sun Polymer Program Institute of Materials ScienceUniversity of ConnecticutStorrsConnecticutUSA Department of Chemical and Biomolecular Engineering University of ConnecticutStorrsConnecticutUSA Department of Biomedical Engineering University of ConnecticutStorrsConnecticutUSA

α-Zirconium phosphate(Zr(HPO_(4))_(2)⋅H_(2)O,α-ZrP)is an inorganic layered *** the first report of crystallineα-ZrP in 1964,thanks to its simple synthesis and unique physiochemical properties,α-ZrP has found widespread application in many fields including mechanical reinforcing,barrier improvement,flame retardancy,anticorrosion,catalysis,environment,energy,and *** of the ease of exfoliation ofα-ZrP to obtain single-layer nanosheets,as well as its rich surface chemistry thanks to the high density of orderly arranged surface acidic hydroxyl groups,α-ZrP single-layer nanosheets are ideal building blocks for self-assembly or assembly with other *** assembly ofα-ZrP nanosheets could form a randomly dispersed structure(isotropic),roughly ordered structure(nematic),or highly ordered structure(smectic)within liquid colloids or solid hybrids(including hydrogels).Thanks to the combination of the unique structures and the novel functions of the components,the assembled materials have found a wide verity of applications due to their excellent *** this article,the methods to synthesizeα-ZrP,the approaches and mechanisms to exfoliateα-ZrP,and the strategies to assembleα-ZrP nanosheets to form various structures,as well as the applications of the assembled materials are *** emerging prospects ofα-ZrP nanosheets as a key material in next-generation functional applications are envisioned.

关键词： application assembly exfoliation nanosheets α-zirconium phosphate

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Ni Flower/MXene-Melamine Foam Derived 3D Magnetic/Conductive Networks for Ultra-Efficient Microwave Absorption and Infrared Stealth

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Nano-Micro Letters 2022年第4期14卷 142-157页

作者： Haoran Cheng Yamin Pan Xin Wang Chuntai Liu Changyu Shen Dirk W.Schubert Zhanhu Guo Xianhu Liu Key Laboratory of Advanced Material Processing&Mold(Ministry of Education) National Engineering Research Center for Advanced Polymer Processing TechnologyCollege of Materials Science and EngineeringZhengzhou UniversityZhengzhou 450002People’s Republic of China Institute of Polymer Materials Friedrich-Alexander-University Erlangen-NurembergMartensstr.791058 ErlangenGermany Integrated Composites Laboratory(ICL) Department of Chemical&Biomolecular EngineeringUniversity of TennesseeKnoxvilleTN 37996USA

The development of multifunctional and efficient electromagnetic wave absorbing materials is a challenging research ***,the magnetized Ni flower/MXene hybrids are successfully assembled on the surface of melamine foam(MF)through electrostatic self-assembly and dip-coating adsorption process,realizing the integration of microwave absorption,infrared stealth,and flame ***,the Ni/MXene-MF achieves a minimum reflection loss(RLmin)of−62.7 dB with a corresponding effective absorption bandwidth(EAB)of 6.24 GHz at 2 mm and an EAB of 6.88 GHz at 1.8 *** electromagnetic wave absorption is attributed to the three-dimensional magnetic/conductive networks,which provided excellent impedance matching,dielectric loss,magnetic loss,interface polarization,and multiple *** addition,the Ni/MXene-MF endows low density,excellent heat insulation,infrared stealth,and flame-retardant *** work provided a new development strategy for the design of multifunctional and efficient electromagnetic wave absorbing materials.

关键词： Ni-MXene/Melamine foam Microwave absorption Heat insulation Infrared stealth Flame-retardant

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Adsorption space for microporous polymers with diverse adsorbate species

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npj Computational Materials 2021年第1期7卷 482-490页

作者： Dylan M.Anstine Dai Tang David S.Sholl Coray M.Colina Department of Materials Science and Engineering University of FloridaGainesvilleFLUSA George and Josephine Butler Polymer Research Laboratory University of FloridaGainesvilleFLUSA School of Chemical&Biomolecular Engineering Georgia Institute of TechnologyAtlantaGAUSA Department of Chemistry University of FloridaGainesvilleFLUSA

The enormous number of combinations of adsorbing molecules and porous materials that exist is known as adsorption *** adsorption space for microporous polymers has not yet been systematically explored,especially when compared with efforts for crystalline *** report molecular simulation data for the adsorptive and structural properties of polymers of intrinsic microporosity with a diverse set of adsorbate species with 345 distinct adsorption isotherms and over 240,000 fresh and swollen *** structures and isotherms were obtained using a sorption-relaxation technique that accounts for the critical role of flexibility of the polymeric *** enables us to introduce a set of correlations that can estimate adsorbent swelling and fractional free volume dilation as a function of adsorbate uptake based on readily characterized *** separation selectivity of the 276 distinct binary molecular pairs in our data is reported and high-performing adsorbent systems are identified.

关键词： properties adsorbent adsorption

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Block Sequence Effects on the Self-Assembly Behaviors of Polypeptide-Based Penta-Block Copolymer Hydrogels

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ACS Applied Materials and Interfaces 2024年第5期16卷 6674-6686页

作者： Wang, Ke-Hsin Liu, Chung-Hao Tan, Dun-Heng Nieh, Mu-Ping Su, Wei-Fang Department of Materials Science and Engineering National Taiwan University No. 1 Sec. 4 Roosevelt Road Taipei10617 Taiwan Polymer program Institute of Materials Science University of Connecticut 25 King Hill Road Unit 3136 StorrsCT06269-3136 United States Department of Chemical and Biomolecular Engineering University of Connecticut StorrsCT06269 United States Department of Materials Engineering Ming-Chi University of Technology 84 Gungjuan Rd. New Taipei City243303 Taiwan

Peptide-based hydrogels have great potential for applications in tissue engineering, drug delivery, and so on. We systematically synthesize, characterize, and investigate the self-assembly behaviors of a series of polypeptide-based penta-block copolymers by varying block sequences and lengths. The copolymers contain hydrophobic blocks of poly(γ-benzyl-l-glutamate) (PBG, Bx) and two kinds of hydrophilic blocks, poly(l-lysine) (PLL, Ky) and poly(ethylene glycol) (PEG, EG34), where x and y are the number of repeating units of each block, where PBG and PLL blocks have unique functions for nerve regeneration and cell adhesion. It shows that a sufficient length of the middle hydrophilic segment capped with hydrophobic end PBG blocks is required. They first self-assemble into flower-like micelles and sequentially form transparent hydrogels (as low as 2.3 wt %) with increased polymer concentration. The hydrogels contain a microscale porous structure, a desired property for tissue engineering to facilitate the access of nutrient flow for cell growth and drug delivery systems with high efficiency of drug storage. We hypothesize that the structure of Bx-Ky-EG34-Ky-Bx agglomerates is beyond micron size (transparent), while that of Ky-Bx-EG34-Bx-Ky is on the submicron scale (opaque). We establish a working strategy to synthesize a polypeptide-based block copolymer with a wide window of sol-gel transition. The study offers insight into rational polypeptide hydrogel design with specific morphology, exploring the novel materials as potential candidates for neural tissue engineering. © 2024 The Authors. Published by American chemical Society

关键词： Block copolymers

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Optimization of photocatalytic ceramic membrane filtration by response surface methodology: Effects of hydrodynamic conditions on organic fouling and removal efficiency

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Chemosphere 2024年 356卷 141885页

作者： Jang, Hoseok Lee, Chang Soo Kim, Jong Hak Kim, Jeonghwan Department of Environmental Engineering Program of Environmental and Polymer Engineering Inha University Michuholgu Incheon22212 Korea Republic of Department of Chemical Engineering Pukyong National University Busan48513 Korea Republic of Department of Chemical and Biomolecular Engineering Yonsei University Seoul03722 Korea Republic of

The effects of the operating conditions, including the applied pressure, feed organic concentration, and recirculation flowrate along the TiO2-coated ceramic membrane, on the normalized membrane permeability and organic removal efficiency were systematically investigated by operating a photocatalytic membrane reactor (PMR). Response surface methodology (RSM) was conducted to better understand the interactive effect of operational conditions as well as their individual and combined effects to control membrane performance. Our results showed that the applied pressure and feed organic concentration, as single parameter, affected the normalized membrane permeability and organic removal efficiency more dominantly than the recirculation flowrate. The polynomial performance equations generated by RSM successfully predicted the membrane performance of the PMR. The responses to the normalized membrane permeability and organic removal efficiency with respect to the operational conditions were less sensitive to any combination of operational conditions than to their individual impacts. The combined effects of the operating conditions were less pronounced in promoting the catalytic performance of organic contaminants on the TiO2 surface. Our RSM analysis based on experimental observations designed by Box–Behnken Design (BBD) suggested that 1.3 bar of applied pressure, 44 mg/L of feed organic dye concentration and 0.8 L/min as recirculation flowrate as optimum conditions achieved more than 98% of organic removal efficiency and less than 5% of decline in normalized membrane permeability. This research shows that the RSM provides effective tool to optimize operational conditions to determine fouling rate and organic removal in PMR. © 2024 Elsevier Ltd

关键词： Titanium dioxide

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