Polymers
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2019
·Vol. 11
·期 9
·1397
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IF 3.164
Luwei Zhang,Haijuan Kong,Mengmeng Qiao,Xiaoma Ding,Muhuo Yu
Aramid fibers (AFs) with their high Young′s modulus and tenacity are easy to degrade seriously with ultraviolet (UV) radiation that leads to reduction in their performance, causing premature failure and limiting their outdoor end use. Herein, we report a method to synthesize nano-SiO2on AFs surfaces in supercritical carbon dioxide (Sc-CO2) to simultaneously improve their UV resistance, thermal stability, and interfacial shear strength (IFSS). The effects of different pressures (10, 12, 14, 16 MPa) on the growth of nanoparticles were investigated. The untreated and modified fibers were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). It was found that the nano-SiO2-decorated fibers exhibited improvement of thermal stability and mechanical properties, and the IFSS of the nano-SiO2modified fibers increases by up to 64% compared with the untreated fibers. After exposure to 216 h of UV radiation, the AFs-UV shows a less decrease in tensile strength, elongation to break and tensile modulus, retaining only 73%, 91%, and 85% of the pristine AFs, respectively, while those of AFs-SiO2-14MPa-UV retain 91.5%, 98%, and 95.5%. In short, this study presents a green method for growing nano-SiO2on the surface of AFs by Sc-CO2to enhance the thermal stability, IFSS, and UV resistance.Keywords:aramid fiber;nano-SiO2;supercritical CO2;thermal stability;interfacial shear strength;UV resistance
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Wei-Guang Xiong,Chang-Yong Li,Ranjith Kumar Kankala,Ai-Zheng Chen,Shi-Bin Wang
There has been a growing emphasis on facile preparation of binary heterogeneous composite materials. Leveraging the eco-friendly efficiency of supercritical CO2 technology, we achieved precise control over the influencing factors of mass transfer, enabling the accurate modulation of the resulting product morphology and properties. In the current study, CuxO/ZrOy composite materials were prepared using this technology and calcined to obtain electrode materials for the detection of cysteine (Cys). Essential comprehensive characterization techniques were employed to elucidate the heterojunction. The resulting electrode demonstrated a linear response to Cys within a concentration range of 0.5 nM to 1 μM, featuring a high sensitivity of 1035 μA·cm–2·μM–1 and a low detection limit of 97.3 nM. Thus, establishing a novel avenue for nonenzyme-based electrochemical sensors tailored for biologically active Cys detection through the implementation of a heterogeneous structure.
研究领域:
材料科学
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分析化学
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生物传感
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DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2024
·
IF 8.1
Jinghao Qian,Haiying Zhan,Hao-Yang Mi,Xiao Li,Weipeng Zhong,Xinchao Wang,Chuntai Liu,Changyu Shen
Asymmetric composite foams (TCFAs) based on thermoplastic polyurethane (TPU) containing carbon nanotubes (CNTs) and Fe 3 O 4 -decorated reduced graphene oxide (Fe 3 O 4 @rGO) electrical-magnetic dual networks with oriented cell structures and a silver layer were fabricated through supercritical carbon dioxide foaming, thermal stretching and a knife coating process. The oriented cells prolonged the electromagnetic (EM) wave transmission path and induced more multiple reflections, and the asymmetric silver layer enabled a special “absorption-reflection-reabsorption” mechanism, which contributed to a high electromagnetic interference (EMI) shielding effectiveness (SE) of 89.5 dB with an A value of 0.748 at a relatively low total filler content of 1.784 vol%. By regulating the oriented cell structure and the incorporation of asymmetric design, the TCFA-1 achieved 10 times improvement in EMI SE T with a low EMI SE R of 1.27 dB. This work offers new insights into the design and fabrication strategies for high performance absorption-dominated EMI shielding foams.
研究领域:
材料科学
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电磁学
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纳米技术
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DOI
高影响因子
ACS Applied Polymer Materials
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2024
·
IF 4.4
Hao Zheng,Guoliang Guo,Xiaoqiang Pei,Pengke Huang,Xiaoling Liu,Wenge Zheng
Elastomer foams with customized multimodal cellular structures have great application requirements in advanced fields, but a simple and practical way to realize it needs to be further studied. Herein, a strategy of presetting cells into elastomers before supercritical CO2 foaming was introduced to customize the cellular structures. Typically, taking olefin block copolymers (OBC, a thermoplastic elastomer with crystalline hard segments and rubbery soft segments) foams as an example, bimodal, sandwich, and gradient multimodal cellular structures were successfully prepared. The interaction between preset cells and newly nucleated cells during foaming had been systematically studied by controlling the morphology of preset cells and foaming conditions. It was found that the configuration of preset cells and the nucleation rate of small cells in OBC foams had a significant impact on their cellular structures. Specifically, the bimodal cellular structures can improve the expansion ratio and elasticity of OBC foams, and their rebounding ability could be improved by 14%, while their energy loss coefficient would be decreased by 17% (compared to homogeneous ones in this study). Furthermore, the feasibilities of this strategy in other elastomer foams (like POE, EPDM, and EVA foams) with bimodal cellular structures were also verified, which was expected to promote the development of high-performance elastomer foams.
研究领域:
材料科学
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高分子化学
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DOI
高影响因子
PARTICLE & PARTICLE SYSTEMS CHARACTERIZATION
·
2019
·Vol. 36
·期 9
·1900016
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IF 4.194
Nina Jiang,Yiwei Wang,Danyang Li,Jie Niu,Shibin Wang,Aizheng Chen
Various C-doped metal oxide nanoparticles (NPs) are prepared from metal nitrates in poly-(methyl vinyl ether- co -maleic anhydride) (PVM/MA) nanoreactors. The loading of metal nitrates in the nanoreactors is realized via a process of solution-enhanced dispersion by supercritical CO 2 . When the temperature exceeds the thermal decomposition temperature of the nitrates, the nitrates-loaded nanoreactors transform into C-doped metal oxide NPs. ZnO, NiO, and Co 3 O 4 NPs as representative of the doped oxides are successfully fabricated. A precise control over the doping concentration and doping site in the lattice is achieved by changing the mass ratio between PVM/MA and metal nitrate. The controllable carbon doping avoids undesirable aggregation of carbon species and metal oxide NPs, endows the NPs with broad and strong absorption bands in the visible light region, and creates channels for separation of photo-generated electrons and holes. In this regard, the resultant C-doped metal oxide NPs exhibit excellent photocatalytic, photo-induced antibacterial, and photothermal performances.
研究领域:
材料科学
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化学工程
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环境科学
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产品关联
DOI
高影响因子
Journal of CO2 Utilization
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2022
·
IF 8.321
Jian-Lei Qi,Qin-Qin Xu,Dan Zhou,Jian-Zhong Yin
Supported single-atom catalytic materials (SACMs) have aroused extensive interest due to their remarkable properties. Herein, a novel method was proffered to prepare Co-NC SACMs using custom-designed N-doped carbon (NC) as support, CoCl 2 as the precursor in supercritical CO 2 with appropriate co-solvent. It was found that when ethanol was used as co-solvent, nanoparticles were obtained while only Co single-atom was obtained when N, N-Dimethylformamide (DMF) was used as co-solvent. Both the theoretical loading and the deposition time influenced the Co loading a lot, and the maximum Co loading was as high as 1.71 wt%. Strong acid, strong alkali, corrosive solvent, and high-temperature treatment were avoided in the whole process. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (AC-HAADF-STEM), X-ray photoelectron spectroscopy (XPS), Inductively Coupled Plasma-Atomic Emission Spectrometry (ICP-AES), and Energy Dispersive X-ray spectroscopy (EDX) were conducted to confirm the existence and uniform distribution of Co atoms over the N-doped carbon materials. The conversion rate of 90.0% and selectivity of 86.0% were obtained for the solvent-free selective oxidation of benzyl alcohol to benzaldehyde at 70 °C and 1 h using the Co-NC SACMs.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF SUPERCRITICAL FLUIDS
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2021
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IF 4.577
Jian-Lei Qi,Qin-Qin Xu,Dan Zhou,Jian-Zhong Yin,Qi-Ke Jiang
Cu single atoms dispersed on N-doped carbon materials (Cu-NC) were obtained after supercritical CO 2 deposition and decompression, without further post-treatment. AC-HAADF-STEM, STEM , XRD , ICP-OES, and XPS results confirmed that the Cu atoms were equably dispersed over the N-doped carbon (NC) support with the loading of 0.80 wt%. The catalytic performance of Cu-NC in solvent-free oxidation of phenylcarbinol to benzaldehyde was investigated, and the conversion of 73.9% and selectivity of 85.7% were obtained at 50 °C for 1 h. A high-pressure view cell was used to observe the dissolution and diffusion for Cu(acac) 2 in scCO 2 . The stability of Cu-NC structures and the formation path of active oxygen species (O*) on different configurations were predicted by density functional theory (DFT) calculations, and CuN 3 C 1 was found to be more conducive to the activation of tert-butyl hydroperoxide (TBHP).
研究领域:
催化化学
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材料科学
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理论计算化学
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DOI
高影响因子
POLYMER
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2025
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IF 4.5
Wentao Guo,Shaolong Wei,Jie Yuan,Xiulu Gao,Ling Zhao,Dongdong Hu
A series of PBST with the branching agent glycerol ranging from 0 mol.% to 1.5 mol.% were synthesized by in-situ polymerization, and different branched PBST foams were prepared using supercritical CO 2 . The introduction of branching structure both improve the rheological, mechanical properties and crystallization behavior of PBST. The crystallinity, relaxation time and tensile modulus of branched PBST increase from 12.7% to 15.2%, from 0.0136 s to 2.288 s and from 63.9 MPa to 87.0 MPa, respectively. When the glycerol content was 1.0 mol.%, the degree of branching was optimal and the maximum initial and final expansion ratios of the prepared foams were 38.5 and 21.5, respectively. The addition of branching agent increases the rigidity and entanglement of the molecular chain and provides more hydroxyl groups as degradation sites, resulting in branched PBST foams exhibiting superior compression and degradation properties. Compared to linear PBST, the compressive modulus of branched PBST foams with an expansion ratio of 10 increases from 1.21 MPa to 2.92 MPa. Introduction of branching structure by in-situ polymerization can provide an effective strategy for the preparation of degradable foams with excellent mechanical and degradation properties, and adjustable cell parameters.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
Artificial Cells Nanomedicine and Biotechnology
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2020
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IF 3.343
Baiji Xue,Jinxiang Huang,Haoxiang Zhang,Bingliang Li,Man Xu,Yuelan Zhang,Maobin Xie,Xuefeng Li
Curcumin (CM) is a natural polyphenolic compound with multiple biomedical functions. However, clinical applications face more challenges due to its low dissolution rate and poor bioavailability. Micronization is an effective strategy to overcome these drawbacks. Herein, CM nanoparticles (CM NPs, ∼300 nm) were fabricated using solution enhanced dispersion by supercritical CO2 (SEDS). The solubility of CM NPs was remarkably enhanced. Aim to study the effects of micronization on the biological functions of CM, we investigated the antibacterial activity of original CM and CM NPs upon Pseudomonas aeruginosa. In vitro, the minimal inhibitory concentrations (MIC) assay, solid-medium spot assay, growth kinetics assay and morphologic observation using atomic force microscopy (AFM) confirmed that the anti-P. aeruginosa activity of CM NPs was enhanced compared to original CM. Moreover, CM NPs also showed stronger inhibition for adhesion and biofilm formation of P. aeruginosa compared to original CM. Experiments on mice infected with P. aeruginosa showed that CM NPs have a better therapeutic effect than the original CM in vivo. In summary, CM NPs may be a novel and promising therapeutic candidate for bacterial infection.
研究领域:
药剂学
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纳米技术
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微生物学
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生物医学工程
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药理学
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DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2024
·
IF 7.1
Zheng Gong,Yichong Chen,Jie Yuan,Ling Zhao,Dongdong Hu
Lightweight, shape memory temperature-tunable, biodegradable, and reusable poly(butylene adipate-co-terephthalate) (PBAT)/polylactic acid (PLA) foams with acetyl tributyl citrate (ATBC) were prepared by a simple, green, and efficient supercritical CO2 foaming technique. ATBC reduces the glass transition temperature (Tg) of PLA in PBAT/PLA composites and, thus, decreases the switching temperature of the shape memory in PBAT/PLA foams. ATBC widens the shape memory applicable temperature range, and the applicable temperature shifts toward lower temperatures. The minimum shape memory applicable temperature is 50 °C. ATBC can also accelerate the shape recovery process. In addition, increased shape memory temperature favors the shape fixing ratio (Rf) and recovery ratio (Rr) and can shorten the shape recovery time. PBAT/PLA foam exhibits a low density of 0.16 g/cm3, an Rf of 93.6%, and an Rr of 95.2%. PBAT/PLA foam also has reusability; both Rf and Rr remain above 85% after 10 cycles.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
Materials Today Bio
·
2025
·
IF 10.2
Jiutao Cao,Shengchang Luo,Wanling Huang,Xiaochang Lu,Ranjith Kumar Kankala,Shibin Wang,Peiyao Xu,Aizheng Chen
Designing dressings that mimic the composition, structure, and function of native skin is of great significance. Despite commercial decellularized extracellular matrix (dECM)-based wound dressings promoted skin regeneration process, reconstructing the fibrous microstructure of native dermis remains a significant challenge. In this work, a dECM-based composite nanofibrous membranes loaded with stem cell secretomes (SCS/dECMM) have been developed for accelerating wound repair, which comprehensively mimicked the dermal tissue in terms of composition, structure, and function. In detail, dermal dECM was prepared by eco-friendly supercritical carbon dioxide (SC-CO 2 ) technology and then mixed with SCS to obtain SCS/dECMM by using electrospinning technology. The resulting nanofibrous membrane with 555.19 nm diameter that maintained SCS bioactivity while enabling sustained SCS release. SCS/dECMM significantly enhanced cell adhesion, proliferation, migration, and angiogenesis, thereby continuously promoting wound repair. In vivo wound healing results revealed that SCS/dECMM accelerated wound healing by promoting re-epithelialization, collagen deposition, and vascularization. SCS/dECMM offered a novel strategy for accelerating wound healing by replicating the composition, structure, and function of native skin.
研究领域:
生物材料
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组织工程
·
再生医学
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纳米技术
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Guiyin Zhang,Danchun Shao,Hongbo Yu,Yi Wan,Yanpeng Jiao,Lihua Li,Jinhuan Tian,Changren Zhou,Lu Lu
Excessive bilirubin in human blood can cause irreversible damage to the patient’s brain and nervous system. Herein, chitin/MXene (Ch/MX) composite aerogel spheres were designed by supercritical CO2 technology to remove bilirubin safely, quickly, and efficiently. In this study, Ti3C2 with 4 nm thickness was uniformly dispersed in the chitin fibers as a monolayer nanofiller and tightly connected with the chitin fibers, which significantly improved the mechanical strength and adsorption capacity of the aerogel spheres. The Ch/MX aerogel spheres could withstand 25,000 times their own weight. Compared with chitin aerogel spheres, the equilibrium time for bilirubin adsorption by Ch/MX aerogel spheres was shortened by 33% and the adsorption capacity was increased by 40%. In addition, Ch/MX aerogel spheres still possess a high adsorption capacity of 142.86 mg/g in bilirubin solution with BSA protein up to 80 mg/mL. Compared with commercial products used clinically, Ch/MX has the advantages of high adsorption capacity and high interference resistance. Compared with our previous chitinous/graphene aerogel spheres, Ch/MX has the advantages of low dosage of functional materials, high bilirubin adsorption rate, and good biocompatibility. This study demonstrates the advantages of MXene as a nanofiller for adsorbing bilirubin and promotes the development and application of inorganic 2D nanomaterials in the clinical treatment of hyperbilirubinemia.
研究领域:
材料科学
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纳米技术
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生物医学工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）