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Structure regulating of metal clusters in carbonized metallic organic frameworks for high-efficient microwave absorption via tuning interaction strength between metals and ligands

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Nano Research 2024年第3期17卷 1699-1709页

作者： Chang Sun Kun-Yan Zhao Ming-Lu Huang Cheng-Long Luo Xu-Dong Chen Ming Wang School of chemistry and Chemical Engineering Chongqing Key Laboratory of Soft-Matter Material Chemistry and Function ManufacturingSouthwest UniversityChongqing 400715China Jieyang Branch of chemistry and Chemical Engineering Guangdong laboratory(Rongjiang laboratory) Jieyang 515200China

Carbonized metallic organic frameworks(CMOF)have been attracting attention in microwave absorption(MA)research area because of their diverse structures,tunable compositions,and rich porosity.Herein,structure regulation on metal clusters in CMOF is achieved by tuning the interaction strength between metals and ligands to enhance microwave absorption performance.Due to relatively weak interaction among copper cations and ligands,copper nanoclusters(CuNC)can be uniformly formed and embedded within the cobalt/zinc(Co/Zn)CMOF.Firstly,copper cations are added to the Co/Zn bimetallic zeolitic imidazolate frameworks(ZIFs).Secondly,the CMOF composite particles with CuNCs(CuNCs/CoZn-CMOF)were developed by a pyrolysis process.The CuNCs/CoZn-CMOF with an appropriate amount of CuNCs can harmonize both dielectric and magnetic losses.As a result,the minimum reflection loss(RLmin)reaches–45.1 dB at a matching thickness of 2.30 mm and the effective absorption bandwidth(EAB)is 8.80 GHz at a thickness of 3.10 mm.The broadband response to electromagnetic waves is attributed to interfacial polarization at CuNCs surface and heterogeneous interfaces,impedance matching and multiple scattering of electromagnetic waves.This study provides a feasible method to develop CMOF microwave absorption materials with high EAB values.

关键词： heterogeneous interface carbonized metallic organic frameworks microwave absorption interfacial polarization

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Mulberry Biomass-Derived Nanomedicines Mitigate Colitis through Improved Inflamed Mucosa Accumulation and Intestinal Microenvironment Modulation

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Research 2024年第1期6卷 791-807页

作者： Wenjing Yang Ya Ma Haiting Xu Zhenhua Zhu Jiaxue Wu Cheng Xu Wei Sun Erhu Zhao Min Wang Rui L.Reis Subhas C.Kundu Xiaoxiao Shi Bo Xiao State key laboratory of Silkworm Genome Biology College of SericultureTextileand Biomass SciencesSouthwest UniversityChongqing 400715China chongqing key laboratory of soft-matter material chemistry and function manufacturing Faculty of Materials and EnergySouthwest UniversityChongqing 400715China Department of Gastroenterology The First Affiliated Hospital of Nanchang UniversityNanchang 330006China Bs Research Group I3Bs—Research Institute on BiomaterialsBiodegradables and BiomimeticsUniversity of MinhoHeadquarters of the European Institute of Excellence on Tissue Engineering and Regenerative MedicineAveParkBarco 4805-017GuimaraesPortugal ICVS/3B’s-PT Government Associate laboratory BragaGuimarãesPortugal

The therapeutic outcomes of conventional oral medications against ulcerative colitis(UC)are restricted by inefficient drug delivery to the colitis mucosa and weak capacity to modulate the inflammatory microenvironment.Herein,a fluorinated pluronic(FP127)was synthesized and employed to functionalize the surface of mulberry leaf-derived nanoparticles(MLNs)loading with resveratrol nanocrystals(RNs).The obtained FP127@RN-MLNs possessed exosome-like morphologies,desirable particle sizes(around 171.4 nm),and negatively charged surfaces(−14.8 mV).The introduction of FP127 to RN-MLNs greatly improved their stability in the colon and promoted their mucus infiltration and mucosal penetration capacities due to the unique fluorine effect.

关键词： fluorine sizes Biomass

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破译pH值和金属离子编程的家蚕纺丝机制

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Science Bulletin 2024年第6期69卷 792-802页

作者：宋凯王叶菁董文杰李珍珍夏庆友朱平何华伟 Integrative Science Center of Germplasm Creation in Western China(chongqing)Science City Biological Science Research CenterSouthwest UniversityChongqing 400715China National laboratory of Biomacromolecules CAS Center for Excellence in BiomacromoleculesInstitute of BiophysicsChinese Academy of SciencesBeijing 100101China chongqing key laboratory of Sericultural Science Chongqing Engineering and Technology Research Center for Novel Silk MaterialsSouthwest UniversityChongqing 400715China University of Chinese Academy of Sciences Beijing 100049China chongqing key laboratory of soft-matter material chemistry and function manufacturing Chongqing 400715China

Silk is one of the toughest fibrous materials known despite spun at ambient temperature and pressure with water as a solvent.It is a great challenge to reproduce high-performance artificial fibers comparable to natural silk by bionic for the incomplete understanding of silkworm spinning in vivo.Here,we found that amphipol and digitonin stabilized the structure of natural silk fibroin(NSF)by a large-scale screening in vitro,and then studied the close-to-native ultrastructure and hierarchical assembly of NSF in the silk gland lumen.Our study showed that NSF formed reversible flexible nanofibrils mainly composed of random coils with a sedimentation coefficient of 5.8 S and a diameter of about 4 nm,rather than a micellar or rod-like structure assembled by the aggregation of globular NSF molecules.Metal ions were required for NSF nanofibril formation.The successive p H decrease from posterior silk gland(PSG)to anterior silk gland(ASG)resulted in a gradual increase in NSF hydrophobicity,thus inducing the sol-gelation transition of NSF nanofibrils.NSF nanofibrils were randomly dispersed from PSG to ASG-1,and self-assembled into anisotropic herringbone patterns at ASG-2 near the spinneret ready for silkworm spinning.Our findings reveal the controlled self-assembly mechanism of the multi-scale hierarchical architecture of NSF from nanofibrils to herringbone patterns programmed by metal ions and p H gradient,which provides novel insights into the spinning mechanism of silk-secreting animals and bioinspired design of high-performance fibers.

关键词： Natural silk fibroin Nanofibril Self-assembly Silkworm Cryo-EM

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Robust microwave absorption in silver-cobalt hollow microspheres with heterointerfaces and electric-magnetic synergism:Towards achieving lightweight and absorption-type microwave shielding composites

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Journal of materials Science & Technology 2023年第7期138卷 245-255页

作者： Dian Yang Jun-Ru Tao Yi Yang Qian-Ming He Ming Wang chongqing key laboratory of soft-matter material chemistry and function manufacturing School of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China

Lightweight and high-efficiency microwave shielding materials based on high absorption loss are the hotspot of current research.Herein,the silver-cobalt bimetallic hollow microspheres(Ag-Co-HM)with low reflection loss and broadband absorption efficiency were fabricated and then used to construct bimetallic hollow structures in polydimethylsiloxane/carbon nanotube composites(PDMS/CNT)to obtain the lightweight and absorption-type microwave shielding composites.The microwave absorption of Ag-Co-HM and the microwave shielding effectiveness(SE T)of the PDMS/CNT/Ag-Co-HM composites was evaluated and discussed.The Ag-Co-HM with a molar ratio(Co/Ag)of 2.07 exhibited a low reflection loss as-46.6 dB at a thickness of 2.6 mm,and an effective absorption bandwidth of 8.40 GHz.The SE T of the PDMS/CNT composites was greatly enhanced by the incorporation of the Ag-Co-HM.Furthermore,the absorption coefficient(A)was also improved by adding the Ag-Co-HM and was much higher than the reflection coefficient.The composites exhibited absorption-type microwave shielding composites.For example,the average microwave SE T of 59.4 dB and A value of 0.78 are achieved in the PDMS/CNT/Ag-Co-HM composites containing 5 wt%CNTs and 10 wt%Ag-Co-HMs,which are much higher than the cor-responding values of 33.7 dB and 0.63 in the PDMS/CNT composites with only 5 wt%CNTs.In addition,the hollow structure of Ag-Co-HM endows the PDMS/CNT/Ag-Co-HM composites to have a low density.

关键词： Microwave shielding Absorption loss Lightweight Polydimethylsiloxane Carbon nanotube

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Hybrid TiO_(2)/Ag NPs/g-C_(3)N_(4) nanocomposite coatings on TC4 titanium alloy for enhanced synergistic antibacterial effect under full spectrum light

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Journal of materials Science & Technology 2022年第23期118卷 35-43页

作者： Xi.Rao L.Du J.J.Zhao X.D.Tan Y.X.Fang L.Q.Xu Y.P.Zhang School of materials and Energy Southwest UniversityChongqing 400715China chongqing key laboratory of soft-matter material chemistry and function manufacturing Southwest UniversityChongqing 400715China

The hybrid TiO_(2)/AgNPs/g-C_(3) N_(4) nanocomposite coatings were constructed on TC4 alloy by a hydrothermal and calcining method.TiO_(2)/AgNPs/g-C_(3) N_(4) nanocomposite coatings demonstrated excellent biocompatibility and osteogenesis compared to those of titanium alloy.The existence of trace AgNPs on the surface and interface of the heterojunction could further enhance the transfer and separation of photogenerated electron/hole pairs,which greatly improved the antibacterial performance under full spectrum light.Holes at the valence band of TiO_(2) and g-C_(3) N_(4) reacted with adsorbed H_(2) O to generate·OH,killing bacteria through photocatalytic redox reaction under light irradiation,while released AgNPs exhibited bacteriostatic efficacy with or without light.This study provides a pathway of coating modification for further improving the antibacterial properties of heterojunction coatings and maintaining the biocompatibility of matrix materials.

关键词： TiO_(2)/AgNPs/g-C_(3)N_(4)nanocomposite g-C_(3)N_(4) Photocatalysis Photocatalytic inactivation of bacteria Disinfection mechanism

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Improving dispersion and delamination of graphite in biodegradable starch materials via constructing cation-π interaction: Towards microwave shielding enhancement

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Journal of materials Science & Technology 2022年第34期129卷 196-205页

作者： Yi Yang Jun-Ru Tao Dian Yang Qian-Ming He Xu-Dong Chen Ming Wang chongqing key laboratory of soft-matter material chemistry and function manufacturing School of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China key laboratory of Polymer Composite and function materials of Ministry of Education Key Laboratory for Designed Synthesis and Applied Polymer MaterialsSchool of Chemistry and Chemical EngineeringSun Yat-sen UniversityGuangzhou 510275China

Herein, a low-cost, biodegradable, and high-performance microwave shielding graphite/starch material was fabricated via constructing a cation-π interaction between ammonium ions and graphite. The graphite flakes and starch were firstly mixed with distilled water containing ammonium hydroxide to form graphite/starch slurry under an ultrasonic assistant. The cation-π interaction could improve delamination degree and dispersion of graphite in starch matrix. The slurry was first used as a coating material on the surface of wood and paper to develop shielding packages. The effect of coating thickness and coating layers on EM shielding property of the materials was investigated. Second, the composites with a high orientation of graphite were fabricated by compression at high pressures. The electrical conductivity and EM shielding effectiveness(SET) of the materials were greatly enhanced by construction of cation-πinteraction and orientation of graphite. Specifically, the EM SETvalues increased from 56.9 to 66.8 d B for the composites with 50 wt.% graphite and 2.0 mm in thickness by constructing cation-π interaction. The EM SETvalues raised from 17.4 to 66.8 d B via the graphite orientation in the materials with the same components and thickness. The shielding mechanism of the compressed composites with orientation dispersion of graphite was also discussed in comparison to the coating layer with random dispersion of graphite.

关键词： Electromagnetic shielding Graphite Starch Bio-degradable Cation-πinteraction

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Improving anti-Gram-positive-bacterial performance and osteogenesis for zinc alloy via mussel mimetic polydopamine with non-antibiotic lysozyme and parathyroid hormone

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Biosurface and Biotribology 2023年第4期9卷 199-209页

作者： Deren Zhao Tianhao Chen Jinqian Chen Banglun Huang Jihua Nie Hulin Liu Yangkai Liu Zilin Chen Feng Zou Qiqi Lu Xiaodong Tan Yunjie Xiang Jing Li Yongping Zhang Xue Feng Xi Rao School of materials and Energy Southwest UniversityChongqingChina chongqing key laboratory of soft-matter material chemistry and function manufacturing Southwest UniversityChongqingChina Department of Clinical laboratory University-Town Hospital of Chongqing Medical UniversityChongqingChina

In this work,a novel coating with a non-antibiotic agent for inhibiting Gram-positive bacteria and promoting osteogenesis was prepared on zinc-aluminium alloy(ZA6-1)via mussel mimetic polydopamine(PDA)containing lysozyme(LYS)and parathyroid hormone(PTH).The results indicate that as-deposited coatings can efficiently decrease the degradation rate of ZA6-1 from 0.52 to 0.16 mm/year,and the addition of LYS weakens the coating resistance,while the addition of PTH enhances the coating resis-tance.In spite that no obvious inhibition of Escherichia coli is observed,the coated zinc alloys show good in vitro antibacterial performance against Staphylococcus aureus.Compared with ZA6-1 zinc alloys,the increase of antibacterial efficacy reaches 86.9%-90.1%.Furthermore,the lower hydrophilicity(26.4°),higher osteoblast cell viability(>100%),good osteoblast cell morphology and better osteoblast cell differentiation(ALP=107.7%)for PDA-LYS/PTH coated samples support that as-prepared coating is promising for modifying biodegradable zinc implants.

关键词： antibacterial biocompatibility non-antibiotic antimicrobial strategy

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The Systematic Evaluation of Physicochemical and Biological Properties In Vitro and In Vivo for Natural Silk Fibroin Nanoparticles

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Advanced Fiber materials 2022年第5期4卷 1141-1152页

作者： Xinyi Li Mengjie Ye Yong‑E.Gao Shengxin Hou Peng Jia Peng Xue Yuejun Kang Zhigang Xu State key laboratory of Silkworm Genome Biology School of Materials and Energy and Chongqing Engineering Research Center for Micro‑Nano Biomedical Materials and DevicesSouthwest UniversityChongqing 400715People’s Republic of China chongqing key laboratory of soft‑matter material chemistry and function manufacturing Southwest UniversityChongqing 400715People’s Republic of China

Nanoparticle-based theranostics has served as a preferential technology for diagnosis and treatment of diseases.However,there are still massive challenges in constructing the ideal platform,which hopefully integrate various characteristics such as easy preparation,multiple utilization,and high therapeutic effect and safety into a single system.Herein,we reported a drug delivery system-based on natural silk fibroin(denoted as SF NPs),and systematically evaluated the physicochemi-cal properties,biological properties and the biosafety assessment of SF NPs.The in vitro and in vivo experimental results confirmed that SF NPs showed high stability,low blood hemolysis and the universal delivery ability of drugs.Additionally,the SF NPs could rapidly enter into cells due to its nanoscale size,and had a weak cytotoxicity against MCF-7,4T1 and L929 cells.Meanwhile,the SF NPs showed enhanced tumor permeability in a simulative model of multicellular spheroids,combined with excellent in vivo biosafety and the negligible organ injury,demonstrate that SF-based nanomedicine presents the utilization potentiality for drug delivery and may provide a new view for cancer treatment.

关键词： Silk fibroin Drug delivery Biocompatibility Cytotoxicity Nanotheranostics

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Natural exosome-like nanovesicles from edible tea flowers suppress metastatic breast cancer via ROS generation and microbiota modulation

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Acta Pharmaceutica Sinica B 2022年第2期12卷 907-923页

作者： Qiubing Chen Qian Li Yuqi Liang Menghang Zu Nanxi Chen Brandon S.B.Canup Liyong Luo Chenhui Wang Liang Zeng Bo Xiao State key laboratory of Silkworm Genome Biology College of SericultureTextileand Biomass SciencesSouthwest UniversityChongqing 400715China chongqing key laboratory of soft-matter material chemistry and function manufacturing School of Materials and EnergySouthwest UniversityChongqing 400715China Department of chemistry Center for Diagnostics and TherapeuticsGeorgia State UniversityAtlantaGA 30303USA College of Food Science Southwest UniversityChongqing 400715China chongqing key laboratory of Natural Product Synthesis and Drug Research School of Pharmaceutical SciencesChongqing UniversityChongqing 401331China

Although several artificial nanotherapeutics have been approved for practical treatment of metastatic breast cancer,their inefficient therapeutic outcomes,serious adverse effects,and high cost of mass production remain crucial challenges.Herein,we developed an alternative strategy to specifically trigger apoptosis of breast tumors and inhibit their lung metastasis by using natural nanovehicles from tea flowers(TFENs).These nanovehicles had desirable particle sizes(131 nm),exosome-like morphology,and negative zeta potentials.Furthermore,TFENs were found to contain large amounts of polyphenols,flavonoids,functional proteins,and lipids.Cell experiments revealed that TFENs showed strong cytotoxicities against cancer cells due to the stimulation of reactive oxygen species(ROS)amplification.The increased intracellular ROS amounts could not only trigger mitochondrial damage,but also arrest cell cycle,resulting in the in vitro anti-proliferation,anti-migration,and anti-invasion activities against breast cancer cells.Further mice investigations demonstrated that TFENs after intravenous(i.v.)injection or oral administration could accumulate in breast tumors and lung metastatic sites,inhibit the growth and metastasis of breast cancer,and modulate gut microbiota.This study brings new insights to the green production of natural exosome-like nanoplatform for the inhibition of breast cancer and its lung metastasis via i.***.and oral routes.

关键词： Tea flower Exosome-like nanoparticle Breast cancer Metastasis ROS generation Microbiota modulation Intravenous injection Oral administration

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Hierarchically spacing DNA probes on bio-based nanocrystal for spatial detection requirements

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Science Bulletin 2019年第13期64卷 934-940页

作者： Lin Gan Ya Wang Meng Zhang Xuehuan Xia Jin Huang key laboratory of Luminescence and Real-Time Analytical chemistry Ministry of EducationSchool of Chemistry and Chemical EngineeringSouthwest UniversityChongqing 400715China chongqing key laboratory of soft-matter material chemistry and function manufacturing Southwest UniversityChongqing 400715China

Sterically spacing and locating functional matters at the nanoscale exert critical effects on their application,especially for the fluorescence probes whose aggregation causes emission quenching.Here we achieved a hierarchical spacing strategy of DNA fluorescence probes for ion detection via locating them separately on rod-like cellulose nanocrystals(CNCs)and further isolating CNCs by pre-grafting long molecular chains.Controlling chemical structure of CNC and location degree could adjust the interspace of DNA probes(with a molecular length of ca.3.6 nm)in a range of 3.5-6.5 nm with a gradient about 0.2 nm.A length up to micrometer scale of the CNC nanorods was necessary to provide DNA probes with well-separated grafting locations and enough freedom,which brought a vast linear detection range from 10 nmol/L to 5 μmol/L of Hg^2+ concentration.The abundant reactive sites on CNC allowed a grafting pre-location of poly(tert-butyl acrylate)(PtBA)to promote the isolation of DNA probes.Controlled radical polymerization was employed to adj ust the length of PtBA molecular chains,which increased the linear sensitivity coefficient of Hg^2+ detection by ca.2.5 times.This hierarchical nanoscale spacing concept based on chemical design can hopefully cond uce to the development of biosensor and medical diagnosis.A hierarchical spacing strategy was applied to separate DNA fluorescent probes on CNCs and detect ion concentration linearly.The first-level spacing was to locate probes uniformly on CNCs,obtaining a wide linear range;and the second-level spacing was to isolate CNCs with polymer,obtaining an increased linear coefficient.

关键词： Cellulose nanocrystal DNA fluorescence probe Steric spacing Surface modification Mercury ion detection

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