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Development of poly(lactic acid)/polyvinyl alcohol-based temperature-responsive shell-core nanofibers: Controlled release, biosafety evaluation, and application in raspberry preservation

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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES 2025年第Pt 2期307卷 142084页

作者： Xia, Shuqiong Bian, Mengjie Li, Hengyi Shi, Chong Xu, Mengyang Lyu, Lianfei Wu, Yaqiong Cao, Fuliang Wang, Yicheng Li, Weilin Fang, Donglu Nanjing Forestry Univ Coll Light Ind & Food Engn Nanjing 210037 Jiangsu Peoples R China Jiangsu Prov & Chinese Acad Sci Inst Bot Jiangsu Key Lab Res & Utilizat Plant Resources Nanjing Bot Garden Mem Sun Yat Sen Nanjing 210014 Jiangsu Peoples R China Nanjing Forestry Univ Coll Forestry & Grassland Coinnovat Ctr Sustainable Forestry Southern China State Key Lab Tree Genet & Breeding Nanjing 210037 Jiangsu Peoples R China

With the increasing demand for sustainable and effective food preservation methods, the development of novel smart preservation materials has become a pressing need. A temperature-responsive smart nanofiber material with a shell-core structure, polyvinyl alcohol/poly(N-isopropylacrylamide)/polylactic acid/lemon essential oil (PPPL), was developed by incorporating lemon essential oil as a core-layer preservative and poly(N-iso- propylacrylamide) as a temperature-responsive shell layer. Transmission electron microscopy confirmed the shell-core structure of the fibers. When the temperature exceeded the lower critical solution temperature, the water contact angle increased from 56 degrees to 91 degrees, confirming that PPPL was temperature-responsive. Infrared spectroscopy revealed interactions between the core and shell layers, which contributed to the tensile strength of 4.31 MPa and enhanced the material's water vapor barrier properties. Release studies indicated that the fibers effectively regulated lemon essential oil release, achieving a radical scavenging rate of 42 % within 24 h. Analysis of the release kinetics revealed temperature-dependent control and effective inhibition of Staphylococcus aureus and Escherichia coli growth. Additionally, the PPPL fibers exhibited significant natural degradation after three months of incubation and showed no toxicity to zebrafish or BV2 mouse glial cells, confirming their environmental and biological safety. A raspberry preservation experiment further demonstrated that under fluctuating temperature conditions, the nanofiber membrane slowed postharvest deterioration in fruit quality. This coaxial nanofiber material enables the sustained release of antibacterial agents triggered by temperature variations, offers long-term preservation for food storage, and supports the use of electrospinning technology in smart food packaging.

关键词： Nanofiber membrane Temperature-responsive shell-core structure Antimicrobial activity Electrospinning Controlled release

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Integrating coaxial electrospinning and 3D printing technologies for the development of biphasic porous scaffolds enabling spatiotemporal control in tumor ablation and osteochondral regeneration

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Bioactive Materials 2024年第4期34卷 338-353页

作者： Wenbao He Chunlin Li Shitong Zhao Zhendong Li Jing Wu Junjun Li Haichao Zhou Yunfeng Yang Yong Xu Huitang Xia Department of Thoracic Surgery Shanghai Pulmonary HospitalSchool of MedicineTongji UniversityShanghaiChina Department of Orthopedics Shanghai Tongji HospitalSchool of MedicineTongji UniversityShanghaiChina Department of Plastic Surgery The First Affiliated Hospital of Shandong First Medical University&Shandong Provincial Qianfoshan HospitalJinanShandong250014PR China Jinan Clinical Research Centre for Tissue Engineering Skin Regeneration and Wound Repair The First Affiliated Hospital of Shandong First Medical UniversityJinanChina Department of Orthopaedics Qilu Hospital of Shandong UniversityShandong University Centre for OrthopaedicsAdvanced Medical Research InstituteCheeloo College of MedicineShandong UniversityJinanChina Department of Neurosurgery Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhanChina Department of Orthopaedics Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghaiChina

The osteochondral defects(OCDs)resulting from the treatment of giant cell tumors of bone(GCTB)often present two challenges for clinicians:tumor residue leading to local recurrence and non-healing of ***,this study focuses on developing a double-layer PGPC-PGPH scaffold using shell-core structure nanofibers to achieve“spatiotemporal control”for treating OCDs caused by *** addresses two key challenges:eliminating tumor residue after local excision and stimulating osteochondral regeneration in non-healing OCD *** a shell layer of protoporphyrin IX(PpIX)/gelatin(GT)and inner cores containing chondroitin sulfate(CS)/poly(lactic-co-glycolic acid)(PLGA)or hydroxyapatite(HA)/PLGA,coaxial electrospinning technology was used to create shell-core structured PpIX/GT-CS/PLGA and PpIX/GT-HA/PLGA *** nanofibers were shattered into nano-scaled short fibers,and then combined with polyethylene oxide and hyaluronan to formulate distinct 3D printing *** upper layer consists of PpIX/GT-CS/PLGA ink,and the lower layer is made from PpIX/GT-HA/PLGA ink,allowing for the creation of a double-layer PGPC-PGPH scaffold using 3D printing *** GCTB lesion removal,the PGPC-PGPH scaffold is surgically implanted into the *** sonosensitizer PpIX in the shell layer undergoes sonodynamic therapy to selectively damage GCTB tissue,effectively eradicating residual ***,the thermal effect of sonodynamic therapy accelerates the shell degradation and release of CS and HA within the core layer,promoting stem cell differentiation into cartilage and bone tissues at the OCD site in the correct anatomical *** innovative scaffold provides temporal control for anti-tumor treatment followed by tissue repair and spatial control for precise osteochondral regeneration.

关键词： Spatiotemporal control Giant cell tumors of bone shell-core structure Double-layered scaffold Osteochondral regeneration

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Nitrogen-doped Zn/Fe@PCN derived from metal-organic frameworks activating persulfate to efficiently degrade rhodamine B

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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH 2024年第2期31卷 2228-2242页

作者： Zhong, Dengjie Liu, Peng Liu, Yi Xu, Yunlan Chongqing Univ Technol Sch Chem Engn Chongqing 400054 Peoples R China

The Zn/Fe@N-doped porous graphitic carbon catalyst (Zn/Fe@PCN) was successfully produced through one-step pyrolysis of g-C3N4 and Zn/Fe-MOF and was used for the activation of persulfate (PS) for the degradation of RhB. The Zn/Fe@PCN/PS system was able to degrade 95.92% of RhB in 30 min at a rate of 0.6453 min(-1) when RhB was concentrated at 50 mg L-1. The efficient degradation of RhB is primarily realized through the synergistic activation of PS by Zn, Fe, and N to produce reactive oxygen species O-1(2), O-center dot(2)-, (SO4-)-S-center dot, and (OH)-O-center dot. Zn-0/Fe-0 in Zn/Fe@PCN forms a galvanic cell with carbon to release electrons to join in the activation of PS. The doping of Zn not only provides sufficient electrons for the activation of PS but also promotes the effective reduction of Fe2+ and thus the Fe2+/Fe3+ cycle. The N doping accelerates the electron transfer during the reaction progress.

关键词： Rhodamine B Zn/Fe@PCN shell-core structure Persulfate

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Variable-Temperature Regulation of NiCo2S4/Mn3O4 Nanostructured Composites for High-Performance Microwave Absorption

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ACS APPLIED NANO MATERIALS 2023年第9期6卷 7658-7667页

作者： Wang, Yin Xing, Honglong Yang, Ping Ji, Xiaoli Anhui Univ Sci & Technol Sch Chem Engn Huainan 232001 Anhui Peoples R China

Currently, transition-metal oxides and sulfides remain widely used in the research on electromagnetic-wave absorbing materials. In the present work, NiCo2S4/Mn3O4 nanostructured composites were prepared by a series of hydro thermal and annealing processes and a strategy for the preparation of morphologically controllable absorbers was developed. The results show that the nanostructure design of Mn3O4 was achieved by the variable-temperature strategy, and the Mn3O4 shell was about 500 nm when the temperature reached 160 degrees C, and the composite had a uniform shell-core structure. In addition, the effects of microscopic morphology, lattice defects, and heterogeneous interfaces on electromag netic parameters are investigated. Inconclusion, the multiple loss mechanism and excellent impedance matching ability synergistically enable the NiCo2S4/Mn3O4 nanostructured composite to achieve excellent microwave absorption characteristics, with a minimum reflection loss of -54.4 dB and a maximum effective absorption bandwidth of 5.36 GHz. This work provides a new perspective on the design of wave-absorbing materials for shell-core structures.

关键词： self-assembled nanostructures variable-temperature strategy shell-core structure dielectric loss electromagnetic absorbers

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core-shell structure BaFe12O19@PANI composites with thin matching thickness and effective microwave absorption properties

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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 2019年第15期30卷 14344-14354页

作者： Wang, Mengqi Lin, Ying Liu, Yiran Yang, Haibo Shaanxi Univ Sci & Technol Shaanxi Key Lab Green Preparat & Functionalizat I Sch Mat Sci & Engn Xian 710021 Shaanxi Peoples R China

The BaFe12O19@PANI composites with different polyaniline (PANI) contents were successfully synthesized by an in situ polymerization method. The composition, phase and morphologies of these composites were characterized thoroughly. The result shows that the introduction of PANI can effectively the absorbing properties of barium ferrite. The prepared BaFe12O19@PANI composites had the best absorption performance when the amount of aniline addition was 400 mu l with the reflection loss of - 65.354 dB, and the matching thickness is 1.47 mm. The introduction of PANI can decrease the weight of electromagnetic absorbing materials, and enhance the dielectric loss and the degree of polarization of the interface. The effective microwave absorption characteristics with thin thickness make the BaFe12O19@PANI composites have great potential application.

关键词： Absorption (physics) microwave absorption Reflection loss Polarization Composites shell-core structure Dielectric losses Absorptive properties

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Facile synthesis and enhanced microwave absorption of C@Ni0.5Zn0.5Fe2O4 shell-core structured nanoparticles

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MATERIALS RESEARCH BULLETIN 2022年 152卷

作者： Shan, Dongyong He, Longhui Cao, Ke Xu, Yunchao He, Jun Yan, Shuoqing Cent South Univ Xiangya Hosp 3 Postdoctoral Res Stn Clin Med Changsha 410000 Peoples R China Cent South Univ Xiangya Hosp 3 Dept Oncol Radiotherapy Ctr Changsha 410000 Peoples R China Hunan Univ Technol & Business Sch Microelect & Phys Dept Appl Phys Changsha 410205 Peoples R China Cent South Univ Sch Phys & Elect Changsha 410083 Peoples R China Hunan Inst Engn Sch Computat Sci & Elect Xiangtan 411104 Peoples R China

C@Ni0.5Zn0.5Fe2O4 nanoparticles with different annealing temperatures and shell-core mass ratios were synthesized by a tannic acid coating method. Through SEM, TEM, EDS and XRD characterization, the as prepared product was confirmed to be shell-core structured C@Ni0.5Zn0.5Fe2O4 nanoparticles with an average diameter of approximately 650 nm, and a carbon layer was deposited on the surface of the product. Compared with uncoated NiZn ferrite, the carbon-coated NiZn ferrite exhibits a moderate real part and imaginary part of its complex permittivity, while maintaining high permeability, which improves the impedance matching characteristics and microwave loss performance of the material. When the shell-core mass ratio was 9:1 and the annealing temperature was 900 degrees C, the as-prepared sample exhibited advanced microwave absorption performance with a minimum reflection loss (RL) of-26.87 dB at 4.3 GHz with a matching thickness of 1.8 mm, and the effective absorptive bandwidth was approximately 4.05 GHz when the RL was below-10 dB.

关键词： Carbon coating NiZn ferrite shell-core structure Broadband microwave absorption

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core-shell structure acrylamide copolymer grafted on nano-silica surface as an anti-calcium and anti-temperature fluid loss agent

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JOURNAL OF MATERIALS SCIENCE 2019年第7期54卷 5927-5941页

作者： Ma, Jingyuan An, Yuxiu Yu, Peizhi China Univ Geosci Beijing Sch Engn & Technol Beijing 100083 Peoples R China Minist Land & Resources Key Lab Deep Geo Drilling Technol Beijing 100083 Peoples R China

The copolymer (PAAN-SiO2) of acrylamide (AM), 2-acrylamido-2-methyl-1-propane sulfonic acid (AMPS), N-vinylpyrrolidone (NVP) and modified nano-silica (M-SiO2) was synthesized by free radical polymerization in a water solution. The composition, micro-morphology and thermal stability properties of PAAN-SiO2 were characterized by Fourier transform infrared spectroscopy, thermal gravity analysis and transmission electron microscopy (TEM). The results showed that AM, AMPS and NVP were successfully grafted onto the surface of M-SiO2 and formed a spherical core-shell structure copolymer. A significant reduction in the filtration volume was achieved after PAAN-SiO2 added, and this phenomenon was even more pronounced after aging at the high temperature. The filtration volume of base slurry containing 2wt% of calcium chloride after aging at 180 degrees C was reduced from 186 to 6ml after adding 2wt% of PAAN-SiO2, which exhibited a special property of anti-calcium contamination at high temperature. The interaction mechanism between PAAN-SiO2 and bentonite and calcium ions was analyzed by particle size analysis, scanning electron microscopy, TEM and X-ray diffraction. Because of the stretching of polymer chain under 180 degrees C that more amide, sulfonic acid groups and cyclic rigid groups were exposed and the strengthening of the connection between PAAN-SiO2 and clay prevents a large amount of ion exchange between Ca2+ and clay layers, reducing the agglomeration of clay. Meantime, the distribution of clay particles was more extensive and some particles with a size of 1-10m plugged the micro-nano-pores on the filter cake, and eventually the thin and compact filter cake was formed.

关键词： Free radical polymerization clays agglomeration Filter cakes Calcium Cation shell-core structure bentonite Filtration Aging aqueous solutions Reinforcement clay particles Calcium Chloride Particle size analysis Acrylamide

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Pd-Ag@CeO2 Catalyst of core-shell structure for Low Temperature Oxidation of Toluene Under Visible Light Irradiation

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JOURNAL OF PHYSICAL CHEMISTRY C 2019年第3期123卷 1761-1769页

作者： Gao, Jian Si, Zhichun Xu, Yunfan Liu, Liping Zhang, Yuanyuan Wu, Xiaodong Ran, Rui Weng, Duan Tsinghua Univ Grad Sch Shenzhen Shenzhen 518055 Peoples R China Tsinghua Univ Sch Mat Sci & Engn Minist Educ Key Lab Adv Mat Beijing 10084 Peoples R China

Heterogeneous thermocatalysis is widely used for the removal of VOCs. However, it is energy-consuming because it must operate at high temperatures. Combining thermocatalysis with photocatalysis makes it possible for the efficient abatement of VOCs at low temperatures. In this work, Pd-Ag@CeO2 photo thermal catalyst was synthesized via synthesizing ceria-coated Ag nanoparticles followed by loading Pd nanoparticles by the liquid phase reduction method. The catalyst has a core shell structure which induces strong electron interactions between Pd/Ag and CeO2 and significantly improves the light harvest, charge separation and dissociative adsorption of Pd-Ag@CeO2 in the visible region. The Pd-Ag@CeO2 catalyst has a good catalytic performance in toluene oxidation, showing the T-50 of Pd-Ag@CeO2 at only 88 degrees C under visible light irradiation. Finally, the possible catalytic mechanism has also been proposed for the oxidation of toluene under visible light irradiation.

关键词： Visible Light low temperature oxidation Toluene shell structures Catalysts REDUCTION METHODS Volatile Organic Compounds shell-core structure Photocatalysts Light irradiation Irradiation

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A novel hydrophobic shell of bio-based polyurethane coated on zeolite 13X: For designing a high-efficiency adsorption heat pump

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ENERGY CONVERSION AND MANAGEMENT 2024年 313卷

作者： He, Xiaoran Xue, Bing Wei, Ruixun Liao, Kanglong Li, Guangyao Zhao, Taibao Zhengzhou Univ Sch Chem Engn Zhengzhou 450001 Peoples R China Zhengzhou Univ Sch Mech & Power Engn Zhengzhou 450001 Peoples R China Kyushu Univ Interdisciplinary Grad Sch Engn Sci Thermal Energy Convers Syst Lab Fukuoka 8168580 Japan Zhengzhou Univ Light Ind Sch Mat & Chem Engn Zhengzhou 450001 Peoples R China

Adsorption heat pump is a promising technology to generate steam from the recovery of low-grade waste heat. Although the direct contact heat exchange method has been proposed in the adsorption heat pump, the presence of free water within the adsorbents limits the improvement of system performance. In this work, a shell-core structure was prepared using a hydrothermally stable zeolite 13X as the core and a hydrophobic bio-based polyurethane as the shell through a drum coating method. The Scanning Electron Microscopy results proved the successful preparation of shell-core zeolites with a shell layer thickness ranging from 7.5 to 9.0 mu m. Thermogravimetric analysis results showed that the shell-core zeolite exhibited good thermal stability up to 300 degrees C. The water content is reduced by 69 % compared to unmodified zeolite 13X. Cyclic operation based on a packed bed of the shell-core zeolite showed 218 similar to 233 degrees C steam generated from hot water at 72 degrees C, while 140 degrees C hot dry gas was used for regeneration. The steam temperature and generation rate of the shell-core zeolite were increased by 22.7 % and 21.6 %, respectively. The mass of free water within the packed bed was greatly reduced by 49.3 %, which resulted in a 49.4 % reduction in regeneration consumption. The Coefficient of Performance for Heating and Specific Heating Power of the shell-core zeolite were maximized by 91 % and 12.3 %, respectively. The tiny protrusions on the surface of the silicon dioxide-modified shell and the air within the pores created an air film that effectively prevented liquid water. Consequently, water could only enter the adsorbent in the form of water vapor. Overall, shell-core zeolite is a suitable adsorbent that can greatly reduce regeneration energy consumption and effectively improve system efficiency. It is foreseeable that the adsorbent preparation method presented in this work will provide a means for advancing the fields of coated slow-release fe

关键词： shell-core structure Coating Surface modification Adsorption heat pump High-temperature steam

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Strategically Staged Tumor Ablation and Inflammation Suppression Using shell-core Nanoparticles to Eradicate Bladder Tumors and Prevent Recurrence

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ADVANCED FUNCTIONAL MATERIALS 2024年第37期34卷

作者： Xu, Yong Zhang, Ruiyun Zhu, Junjie Guo, Zhiyi Jin, Di Qian, Lei Yang, Yang Chen, Haige Tongji Univ Shanghai Pulm Hosp Sch Med Dept Thorac Surg Shanghai 200433 Peoples R China Shanghai Jiao Tong Univ Renji Hosp Sch Med Dept Urol Shanghai 200001 Peoples R China Tongji Univ Shanghai Pulm Hosp Sch Med Cent Lab Shanghai 200433 Peoples R China Tongji Univ Sch Mat Sci & Engn Shanghai 201804 Peoples R China

Nanomedicine shows promise in the therapy of eradicating bladder tumors and preventing tumor recurrence caused by cancer-related inflammation. shell-core structured BNN6/Z8@ALA/Z67 nanoparticles with sequential release kinetics is designed, aiming to eliminate tumors and curb inflammation, thereby ablating bladder tumors and preventing their recurrence. The shell of this nanoparticle comprises zeolitic imidazolate framework-67 (Z67) and 5aminolevulinic acid (ALA), while the core comprises zeolitic imidazolate framework-8 (Z8) and N,N'-di-sec-butyl-N,N'-dinitroso-1,4-phenylenediamine (BNN6). Modified with polydopamine-methoxypolyethylene glycol amine, these nanoparticles efficiently target bladder tumors. In the acidic tumor environment, the outer-layered Z67 breaks down rapidly, releasing ALA, which transforms into protoporphyrin IX (PpIX) in mitochondria. Additionally, the degraded Z67 triggers the conversion of hydrogen peroxide into oxygen, aiding PpIX to generate reactive oxygen species under ultrasound, facilitating tumor ablation. As Z67 decomposes, the inner-layered Z8 releases BNN6 in the acidic environment. Ultrasound exposure prompts the release of nitric oxide, effectively reducing inflammation. Under ultrasound, BNN6/Z8@ALA/Z67 showcased outstanding staged anti-tumor and anti-inflammatory effects in both in vitro and murine subcutaneous tumor model tests, and effectively prevents tumor recurrence in rat bladder tumor models. These findings underscore the promising potential of the designed shell-core nanoparticle with staged tumor ablation and inflammation suppression in preventing bladder tumor recurrence. shell-core structured BNN6/Z8@ALA/Z67 nanoparticles with sequential release kinetics, aiming to achieve staged tumor ablation and inflammation suppression is designed. The shell of this nanoparticle comprises zeolitic imidazolate framework-67 (Z67) and 5-aminolevulinic acid (ALA), while the core comprises zeolitic imidazolate framework-8 (Z8) and N,N'

关键词： anti-inflammation bladder tumor recurrence sequential release shell-core structure tumor ablation

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