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A superspreading layering process enabled high performance layered nanocomposites

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Science China Chemistry 2020年第7期63卷 873-874页

作者： qing-fang guan Shu-Hong Yu Division of Nanomaterials&Chemistry Hefei National Laboratory for Physical Sciences at the MicroscaleDepartment of ChemistryUniversity of Science and Technology of ChinaHefei 230026China

Biomaterials like nacre, bones and mollusk shells provide a rich source of inspiration for developing mechanically strong and tough composites. They have stimulated great research interest to explore various methods to prepare artificially synthetic composites with desired strength and toughness for practical applications. In addition to mineralization [1], a number of approaches, such as vacuum filtration.

关键词： composites tough shells

Regenerated isotropic wood

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National Science Review 2021年第7期8卷 137-145页

作者： qing-fang guan Zi-Meng Han Huai-Bin Yang Zhang-Chi Ling Shu-Hong Yu Division of Nanomaterials & Chemistry Hefei National Laboratory for Physical Sciences at the Microscale Institute of Energy Hefei Comprehensive National Science Center CAS Center for Excellence in Nanoscience Department of Chemistry Institute of Biomimetic Materials & Chemistry University of Science and Technology of China

Construction of sustainable high-performance structural materials is a core part of the key global sustainability goal. Many efforts have been made in this field; however, challenges remain in terms of lowering costs by using all-green basic building blocks and improving mechanical properties to meet the demand of practical applications. Here, we report a robust and efficient bottom-up strategy with micro/nanoscale structure design to regenerate an isotropic wood from natural wood particles as a high-performance sustainable structural material. Regenerated isotropic wood（RGI-wood） exceeds the limitations of the anisotropic and inconsistent mechanical properties of natural wood, having isotropic flexural strength of170 MPa and flexural modulus of10 GPa. RGI-wood also shows superior water resistance and fire retardancy properties to natural pine wood. Mass production of large sized RGI-wood and functional RGI-wood nanocomposites can also be achieved.

关键词： sustainable structural materials wood material cellulose nanofiber micro/nanoscale structure design bottom-up strategy

Multiscale cellulose-based fireproof and thermal insulation gel materials with water-regulated forms

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Nano Research 2023年第2期16卷 3379-3386页

作者： Chong-Han Yin Huai-Bin Yang Zi-Meng Han Kun-Peng Yang Zhang-Chi Ling qing-fang guan Shu-Hong Yu Department of Chemistry Institute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Institute of Innovative Materials Department of Materials Science and EngineeringDepartment of ChemistrySouthern University of Science and TechnologyShenzhen 518055China

Different forms of construction materials(e.g.,paints,foams,and boards)dramatically improve the quality of *** the increasing environmental requirements for buildings,it is necessary to develop a comprehensive sustainable construction material that is flexible in application and exhibits excellent performance,such as fireproofing and thermal ***,an adjustable multiform material strategy by water regulation is proposed to meet the needs of comprehensive applications and reduce environmental *** gels are constructed based on multiscale cellulose fibers and hollow glass microspheres,with fireproofing and thermal *** traditional materials,this multiscale cellulose-based gel can change forms from dispersion to paste to dough by adjusting its water content,which can realize various construction forms,including paints,foams,and low-density boards according to different scenarios and corresponding needs.

关键词： bioinspired multiscale structure nanocellulose water regulation gel material

A general aerosol-assisted biosynthesis of functional bulk nanocomposites

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National Science Review 2019年第1期6卷 64-73页

作者： qing-fang guan Zi-Meng Han Tong-Tong Luo Huai-Bin Yang Hai-Wei Liang Si-Ming Chen guang-Sheng Wang Shu-Hong Yu Division of Nanomaterials & Chemistry Hefei National Laboratory for Physical Sciences at the MicroscaleDepartment of Chemistry University of Science and Technology of China School of Chemistry and Environment Beihang University CAS Center for Excellence in Nanoscience Collaborative Innovation Center of Suzhou Nano Science and Technology Hefei Science CenterDepartment of Chemistry University of Science and Technology of ChinaHefei 230026 China3.School of Chemistry and EnvironmentBeihang University

Although a variety of nanoparticles with better-than-bulk material performances can be synthesized, it remains a challenge to scale the extraordinary properties of individual nanoscale units to the macroscopic level for bulk nanostructured materials. Here, we report a general and scalable biosynthesis strategy that involves simultaneous growth of cellulose nanofibrils through microbial fermentation and co-deposition of various kinds of nanoscale building blocks(NBBs) through aerosol feeding on solid culture substrates. We employ this biosynthesis strategy to assemble a wide range of NBBs into cellulose nanofibril-based bulk nanocomposites. In particular, the biosynthesized carbon nanotubes/bacterial cellulose nanocomposites that consist of integrated 3D cellulose nanofibril networks simultaneously achieve an extremely high mechanical strength and electrical conductivity, and thus exhibit outstanding performance as high-strength lightweight electromagnetic interference shielding materials. The biosynthesis approach represents a general and efficient strategy for large-scale production of functional bulk nanocomposites with enhanced performances for practical applications. Industrial-scale production of these bulk nanocomposite materials for practical applications can be expected in the near future.

关键词： bacterial cellulose nanoscale building blocks biosynthesis electromagnetic shielding scalable fabrication

The reservoir characteristics and their controlling factors of the sublacustrine fan in the Paleogene Dongying Formation, Bohai Sea,China

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Journal of Palaeogeography 2024年第1期13卷 127-148页

作者： Xiao-Jun Pang guan-Min Wang Meng Zhao qing-Bin Wang Xue-fang Zhang School of Geosciences China University of Petroleum(East China)QingdaoShandong 266580China Tianjin Branch of China National Offshore Oil Corporation Limited Tianjin 300459China

Sublacustrine fan is an important element in continental lacustrine basins and is significant for reservoir exploration. Oil and gas resources have been found in the sublacustrine fan sandstone reservoirs of the Paleogene Dongying Formation in the Bohai Sea. In this study, the characteristics of the sublacustrine fan reservoirs and the controlling factors are studied using information from logging, cores, physical properties,casting thin sections, X-ray diffraction of clay minerals, vitrinite reflectance, rock pyrolysis, manometry data,and 3D seismic data. The sublacustrine fans of the Dongying Formation in the LD10, QHD34, and BZ21 structures show high-quality reservoirs with porosity >15 % and permeability >5 m D. The main controlling factors of the high-quality reservoirs are attributed to the favorable sedimentary facies type and negligible compaction,and cementation, substantial dissolution of K-feldspar, overpressure, and the development of faults and fractures. A high-quality sublacustrine fan reservoir model has been established to explain how these factors affected the physical properties. The favorable targets for oil and gas exploration in the Dongying Formation of Bohai Sea include undercompacted sandy debris flow reservoirs showing the dissolution of K-feldspar, and the reservoirs which are connected to the source rocks by faults. This study provides insights to establish the relationship between sedimentology, diagenesis and reservoir quality. The results of this study are significant for the exploration and development of the sublacustrine fan sandstone reservoirs in the Bohai Sea and analogous sandstone reservoirs elsewhere.

关键词： Sublacustrine fan High-quality reservoir Dissolution Overpressure Fault Bohai Sea

A low-frequency and broadband wave-insulating vibration isolator based on plate-shaped metastructures

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Applied Mathematics and Mechanics(English Edition) 2024年第7期45卷 1171-1188页

作者： Wei WEI Feng guan Xin fang College of Intelligent Science National University of Defense TechnologyChangsha410073China Naval Research Academy Beijing100161China

A metamaterial vibration isolator,termed as wave-insulating isolator,is proposed,which preserves enough load-bearing capability and offers ultra-low and broad bandgaps for greatly enhanced wave *** consists of plate-shaped metacells,whose symmetric and antisymmetric local resonant modes offer several low and broad mode bandgaps although the complete bandgap remains high and *** bandgap mechanisms,vibration isolation properties,effects of key parameters,and robustness to complex conditions are *** experimentally demonstrated,the wave-insulating isolator can improve the vibration insulation in the ranges of[50 Hz,180 Hz]and[260 Hz,400 Hz]by 15 dB and 25 dB,respectively,in contrast to the conventional isolator with the same first resonant frequency.

关键词： metamaterial and metastructure vibration isolation bandgap wave insulation plate

Growing Bacterial Cellulose-Based Sustainable Functional Bulk Nanocomposites by Biosynthesis:Recent Advances and Perspectives

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Accounts of Materials Research 2022年第6期3卷 608-619页

作者： qing-fang guan Zi-Meng Han Zhang-Chi Ling Huai-Bin Yang Shu-Hong Yu Department of Chemistry Institute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Laboratory for Physical Sciences at the MicroscaleInstitute of EnergyHefei Comprehensive National Science CenterUniversity of Science and Technology of ChinaHefei 230026China

In recent years,with the continuous development of nanomaterials and composite preparation methods,nanocomposites are playing an increasingly important role as structural materials or functional materials due to their outstanding *** an important part of nanocomposites,polymerbased nanocomposites have attracted the interest of researchers,whose preparation methods have been significantly expanded with the rapid development of polymer chemistry and *** present,nanomaterials can be combined with the polymer matrix to form various nanocomposite materials in multiple ways,ranging from simple blending to complex processes combining surface modification and in situ ***,these polymerbased nanocomposites are still limited by their incompatibility of structural strength and functionality and unsustainability of the preparation *** a new type of polymer-based materials,the polymers synthesized by microorganisms,especially bacterial cellulose(BC)produced by bacteria such as Gluconacetobacter xylinus,have great potential to overcome the above-mentioned *** the one hand,BC has a fine nanoscale three-dimensional(3D)network with extremely high *** continuous nanoscale 3D network means that the nanomaterials composited with BC can be interspersed in a 3D network,effectively exerting their functionality without compromising the strength of the *** the other hand,the process of microbial production of BC is completed under normal pressure and temperature without using toxic reagents and solvents,which gives it a huge advantage in terms of sustainability over traditional polymer ***,the high-density 3D nanoscale network of BC is too tight to allow the entry of nanomaterials in a homogeneous way,which brings great difficulties to the composite process of BC and *** this problem,a new in situ composite preparation strategy called aerosol-assisted biosynthesis(AABS)strategy h

关键词： composite composites preparation

Design of Protograph LDPC-Coded MIMO-VLC Systems with Generalized Spatial Modulation

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China Communications 2024年第3期21卷 118-136页

作者： Dai Lin fang Yi guan Yongliang Mohsen Guizani School of Information Engineering Guangdong University of TechnologyGuangzhou 51006China The State Key Laboratory of Integrated Services Networks Xidian UniversityXi’an 710126China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore Department of Machine Learning Mohamed Bin Zayed University of Artificial Intelligence(MBZUAI)Abu DhabiUnited Arab Emirates

This paper investigates the bit-interleaved coded generalized spatial modulation(BICGSM) with iterative decoding(BICGSM-ID) for multiple-input multiple-output(MIMO) visible light communications(VLC). In the BICGSM-ID scheme, the information bits conveyed by the signal-domain(SiD) symbols and the spatial-domain(SpD) light emitting diode(LED)-index patterns are coded by a protograph low-density parity-check(P-LDPC) code. Specifically, we propose a signal-domain symbol expanding and re-allocating(SSER) method for constructing a type of novel generalized spatial modulation(GSM) constellations, referred to as SSERGSM constellations, so as to boost the performance of the BICGSM-ID MIMO-VLC ***, by applying a modified PEXIT(MPEXIT) algorithm, we further design a family of rate-compatible P-LDPC codes, referred to as enhanced accumulate-repeat-accumulate(EARA) codes,which possess both excellent decoding thresholds and linear-minimum-distance-growth property. Both analysis and simulation results illustrate that the proposed SSERGSM constellations and P-LDPC codes can remarkably improve the convergence and decoding performance of MIMO-VLC systems. Therefore, the proposed P-LDPC-coded SSERGSM-mapped BICGSMID configuration is envisioned as a promising transmission solution to satisfy the high-throughput requirement of MIMO-VLC applications.

关键词： bit-interleaved coded modulation generalized spatial modulation multiple-input multipleoutput protograph LDPC codes visible light communication

High-current pulsed electron beam modification on microstructure and performance of Cu/CuW diffusion bonding joints

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Rare Metals 2024年第6期43卷 2819-2831页

作者： Na-Na Tian Cong-Lin Zhang Peng Lyu Jin-Tong guan Jie Cai qing-Feng guan Shun Guo School of Materials Science and Engineering Jiangsu UniversityZhenjiang 212013China School of Material Science and Engineering Yancheng Institute of TechnologyYancheng 221051China Engineering Institute of Advanced Manufacturing and Modern Equipment Technology Jiangsu UniversityZhenjiang 212013China

This study investigates the influence of high-current pulsed electron beam(HCPEB)modification on the microstructure and shear strength of Cu/CuW *** solid-state diffusion bonding of modified-Cu(MCu)and modified-CuW(M-CuW)was achieved by HCPEB modification pretreatment at a temperature of 800-900℃and a pressure of 5 MPa for 10-50 *** demonstrate that HCPEB modification facilitates the dissolution of W and Cu,resulting in the formation of a Cu_(0.4)W_(0.6)solid solution and thus enhancing the uniform distribution of ***,HCPEB-induced defects play a beneficial role in promoting the diffusion process by providing fast diffusion paths for *** optimal joints with the maximum shear strength of 213.7 MPa were obtained through bonding M-Cu and M-CuW at 900℃and 5 MPa for 30 min,which attributes to the combined effects of fine-grained strengthening and solid solution ***,the application of HCPEB modification showcases its effectiveness in promoting element diffusion and enhancing the mechanical performance of the joints.

关键词： HCPEB Element diffusion Shear strength Crystal defects Surface modification