Polyimide (PI) has become an indispensable key material for low-Earth orbit (LEO) spacecraft due to its excellent performance. However, it is highly susceptible to atomic oxygen (AO) erosion, which severely limits the service lifetime of spacecraft. Herein, a dual-protection (matrix modification and coating) strategy is proposed to improve the anti-AO capacity of PI by introducing rectorite nanosheets (RNs) with outstanding AO resistance. The dual-protected rectorite/PI film shows lower AO erosion yield (only 4.04% of the pristine PI film) and more stable mechanical properties after AO irradiation. The AO-resistant mechanism is attributed to the blocking and adsorbing AO of RNs based on the experiment investigation and molecular dynamic simulation. The key advantage of this method is that, even if the coating is compromised, the RNs embedded in the matrix can still provide resistance against AO erosion. Consequently, this protection strategy provides a new approach for constructing superior AO-resistant PI films applicable in LEO conditions. • Rectorite nanosheets are simply and quickly fabricated by ball milling • Dual-protected rectorite/polyimide films show exceptional atomic oxygen resistance • The advantages of the dual-protection strategy are thoroughly explored • The blocking and adsorbing mechanisms of rectorite nanosheets are deeply revealed
{"title":"Rectorite/polyimide films with superior atomic oxygen resistance by a dual-protection strategy","authors":"Ruiheng Feng, Qiang Wei, Chuanjin Huang, Libin Zhao","doi":"10.1016/j.mtcomm.2025.114587","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2025.114587","url":null,"abstract":"Polyimide (PI) has become an indispensable key material for low-Earth orbit (LEO) spacecraft due to its excellent performance. However, it is highly susceptible to atomic oxygen (AO) erosion, which severely limits the service lifetime of spacecraft. Herein, a dual-protection (matrix modification and coating) strategy is proposed to improve the anti-AO capacity of PI by introducing rectorite nanosheets (RNs) with outstanding AO resistance. The dual-protected rectorite/PI film shows lower AO erosion yield (only 4.04% of the pristine PI film) and more stable mechanical properties after AO irradiation. The AO-resistant mechanism is attributed to the blocking and adsorbing AO of RNs based on the experiment investigation and molecular dynamic simulation. The key advantage of this method is that, even if the coating is compromised, the RNs embedded in the matrix can still provide resistance against AO erosion. Consequently, this protection strategy provides a new approach for constructing superior AO-resistant PI films applicable in LEO conditions. • Rectorite nanosheets are simply and quickly fabricated by ball milling • Dual-protected rectorite/polyimide films show exceptional atomic oxygen resistance • The advantages of the dual-protection strategy are thoroughly explored • The blocking and adsorbing mechanisms of rectorite nanosheets are deeply revealed","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":"50 1","pages":"114587-114587"},"PeriodicalIF":0.0,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147331874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Curcumin, a polyphenolic compound, demonstrates neuroprotective potential through its antioxidant, anti-inflammatory, and anti-amyloid activities. To enhance its delivery, we fabricated poly(lactic-co-glycolic acid) (PLGA) nanoparticles encapsulating curcumin and stabilized them with chitosan. Successful formulation was confirmed by FTIR, XRD, and SEM analyses. Zeta potential measurement confirmed a surface charge reversal from -28.1 mV (uncoated PLGA) to + 14.7 mV after chitosan coating. The nanoparticles exhibited favorable drug loading (4.09 ± 0.02 % to 5.67 ± 0.01 %) and encapsulation efficiency (14.33 ± 0.08 % to 19.85 ± 0.04 %), and provided a sustained release profile (>24 h) enhanced by chitosan. The curcumin encapsulated PLGA-chitosan nanocarriers demonstrated potent antioxidant activity (>80 % DPPH scavenging at 0.75 mg/mL) and no significant cytotoxicity against PC12 cells at concentrations up to 80 μg/mL. In HCT116 cells, the chitosan coating enhanced cellular uptake and cytoplasmic distribution. Crucially, the nanocarriers promoted PC12 cells differentiation, resulting in a high proportion of neurite-bearing cells. These findings indicate that the designed chitosan-coated PLGA nanoparticles are a promising delivery system for promoting neuronal differentiation.
{"title":"Curcumin encapsulated PLGA-chitosan nanocarrier: Fabrication, characterization, and in vitro differentiation evaluation on PC12 cells","authors":"Renzhang Liang, Cuilian Yu, Dong Ma, Xiaohan Cao, Liying Bai, Yulan Li, Jingxian Zhang, Jiayue Liu, Xia Qiao, Bingren Tian","doi":"10.1016/j.mtcomm.2025.114549","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2025.114549","url":null,"abstract":"Curcumin, a polyphenolic compound, demonstrates neuroprotective potential through its antioxidant, anti-inflammatory, and anti-amyloid activities. To enhance its delivery, we fabricated poly(lactic-co-glycolic acid) (PLGA) nanoparticles encapsulating curcumin and stabilized them with chitosan. Successful formulation was confirmed by FTIR, XRD, and SEM analyses. Zeta potential measurement confirmed a surface charge reversal from -28.1 mV (uncoated PLGA) to + 14.7 mV after chitosan coating. The nanoparticles exhibited favorable drug loading (4.09 ± 0.02 % to 5.67 ± 0.01 %) and encapsulation efficiency (14.33 ± 0.08 % to 19.85 ± 0.04 %), and provided a sustained release profile (>24 h) enhanced by chitosan. The curcumin encapsulated PLGA-chitosan nanocarriers demonstrated potent antioxidant activity (>80 % DPPH scavenging at 0.75 mg/mL) and no significant cytotoxicity against PC12 cells at concentrations up to 80 μg/mL. In HCT116 cells, the chitosan coating enhanced cellular uptake and cytoplasmic distribution. Crucially, the nanocarriers promoted PC12 cells differentiation, resulting in a high proportion of neurite-bearing cells. These findings indicate that the designed chitosan-coated PLGA nanoparticles are a promising delivery system for promoting neuronal differentiation.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":"50 1","pages":"114549-114549"},"PeriodicalIF":0.0,"publicationDate":"2025-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147331533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-12-01DOI: 10.1016/j.mtcomm.2025.114441
Na Ying, Shuya An, Shiyu Wu, Jing Yang, Jun Ho Ji, Haoyuan Su, Jun Duan, Hongzhi Pan, Dongdong Zeng
{"title":"Engineered baicalin-loaded chitosan nanoparticles with sustained release and biocompatibility","authors":"Na Ying, Shuya An, Shiyu Wu, Jing Yang, Jun Ho Ji, Haoyuan Su, Jun Duan, Hongzhi Pan, Dongdong Zeng","doi":"10.1016/j.mtcomm.2025.114441","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2025.114441","url":null,"abstract":"","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":"49 1","pages":"114441-114441"},"PeriodicalIF":0.0,"publicationDate":"2025-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147333188","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-11-30DOI: 10.1016/j.mtcomm.2025.114428
He Yanping, Jian Xiao, Gong Jiahao, Guibao Qiu
This study introduces a powder metallurgy-based strategy to fabricate copper foam sandwiches (CFSs) with metallurgical bonding interfaces, thereby overcoming the interfacial limitations of conventional riveted or brazed CFSs. A panel-core-panel structure was constructed using copper powder and needle-shaped carbamide, followed by pressing and gradient sintering, which simultaneously enabled porous core formation and interfacial bonding. SEM-EDS, XRD and μ -CT analyses confirmed continuous Cu distribution across the CFS interface via atomic diffusion. Mechanical testing showed that the CFS exhibited a compressive strength of 24.8 MPa (comparable to that of single-layer copper foam, 25.2 MPa) and a shear strength of 43.2 MPa, which was approximately ten times higher than that of single-layer copper foam (4.1 MPa) and over thirteen times greater than that of brazed CFS (3.2 MPa). This improvement results from reduced interfacial resistance due to metallurgical bonding. The proposed strategy achieves structural-mechanical synergy and offers a scalable solution for developing high-strength metal foam sandwich structures.
{"title":"A novel powder metallurgy strategy for fabricating copper foam sandwiches with metallurgical bonding interfaces","authors":"He Yanping, Jian Xiao, Gong Jiahao, Guibao Qiu","doi":"10.1016/j.mtcomm.2025.114428","DOIUrl":"https://doi.org/10.1016/j.mtcomm.2025.114428","url":null,"abstract":"This study introduces a powder metallurgy-based strategy to fabricate copper foam sandwiches (CFSs) with metallurgical bonding interfaces, thereby overcoming the interfacial limitations of conventional riveted or brazed CFSs. A panel-core-panel structure was constructed using copper powder and needle-shaped carbamide, followed by pressing and gradient sintering, which simultaneously enabled porous core formation and interfacial bonding. SEM-EDS, XRD and μ -CT analyses confirmed continuous Cu distribution across the CFS interface via atomic diffusion. Mechanical testing showed that the CFS exhibited a compressive strength of 24.8 MPa (comparable to that of single-layer copper foam, 25.2 MPa) and a shear strength of 43.2 MPa, which was approximately ten times higher than that of single-layer copper foam (4.1 MPa) and over thirteen times greater than that of brazed CFS (3.2 MPa). This improvement results from reduced interfacial resistance due to metallurgical bonding. The proposed strategy achieves structural-mechanical synergy and offers a scalable solution for developing high-strength metal foam sandwich structures.","PeriodicalId":18477,"journal":{"name":"Materials Today Communications","volume":"50 1","pages":"114428-114428"},"PeriodicalIF":0.0,"publicationDate":"2025-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147330697","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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