Chemistry-An Asian Journal
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2020
·Vol. 15
·期 7
·1088-1093
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IF 4.056
Yuchen Deng,Peng Li,Shujuan Sun,Haiyan Jiang,Xu Ji,Huanrong Li
Graphical Supramolecular co-assembling terpyridine-derivatives with laponite® nanoclay are exploited to acquire the efficient amorphous room-temperature phosphorescence (RTP), which display distinctive RTP performance (green RTP for 1 @ LP and blue-green RTP for 2 @ LP) . Owing to their distinctive RTP performance, the RH sensing and high-level data encryption are achieved. Supramolecular co-assembling terpyridine-derivatives with nanoclay ( LP ) are exploited to acquire efficient amorphous room-temperature phosphorescence (RTP). Experimental and theoretical investigations reveal that this co-assembly not only brings about a configuration transformation from the trans-trans ( a ) to the cis-trans ( a′′ ) form via the protonating process, significantly narrowing the singlet-triplet energy gap, thereby effectively facilitating the single-triplet ISC processes, but also well protects the triplet state and suppresses the nonradiative transitions via restricting molecular rotation and vibration by the hydrogen-bond interactions between them. Additionally, the flexible and transparent films, through co-assembling 1 @ LP (or 2 @ LP ) with polyvinyl alcohol (PVA), also display excellent phosphorescence performance. Owing to their distinctive RTP performances, the RH sensing and high-level data encryption are achieved.
研究领域:
材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Sheng Shang,Xiao Ma,Bihe Yuan,Gongqing Chen,Yaru Sun,Chuyuan Huang,Song He,Huaming Dai,Xianfeng Chen
A novel nano-clay flame retardant (HNTs@MEL-PA) is prepared by modifying halloysite nanotubes (HNTs) with supramolecular self-assembly technology using melamine (MEL) and bio-based phytic acid (PA) as the building blocks. Transmission electron microscopy images and Fourier transform infrared spectra show that the surface of HNTs is successfully decorated with MEL-PA supramolecular aggregates by hydrogen bonding . The feasibility of using HNTs@MEL-PA as a flame retardant for polypropylene (PP) is explored. Compared with PP/HNTs composites, the dispersion of HNTs@MEL-PA and its interfacial interactions with PP matrix are greatly improved. Heat release of PP is decreased in a certain degree and its smoke release is greatly reduced by HNTs@MEL-PA. With the addition of 15 wt% HNTs@MEL-PA, total smoke production of PP is decreased from 15.7 to 10.2 m 2 , indicating the greatly improved fire safety. Flame retardant and smoke suppression mechanisms of HNTs@MEL-PA are proposed based on thermal decomposition results and the analysis on char residue .
研究领域:
材料科学
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化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2022
·Vol. 57
·期 24
·11430-11442
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IF 4.682
Xu Jun,Zhang Zixiang,Nie YongJia,Liu Yanxia,Fan Yue,Zhao Wenpeng,Feng Xianqi
Self-healing materials can autonomously heal injury like organism, which have attracted increasing attention from academics and industry engineers. However, the mechanical property and self-healing ability of the self-healing material is hard to be reconciled. Here, we report a simple approach to fabricate fast self-healing materials with high mechanical strength and improved triple shape memory effect by incorporation of nanoclay into a polymer matrix. The nanocomposite was prepared by in situ polymerization of poly(ethylene glycol) 400 methyl ether acrylate (mPEG-acrylate) and acryloylmorpholine (ACMO) in the presence of nanoclay. The thus obtained composite exhibits remarkable mechanical properties of an optimistic maximum tensile strength of ~ 8.9 MPa, and high healing efficiency of ~ 99.6% can be achieved after healing for only 1 min at room temperature. This strategy provides insights for the preparation of high-strength, multi-shape memory and fast self-healing composites. Graphical abstract
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2022
·Vol. 29
·期 12
·1-15
·
IF 3.061
Olonisakin Kehinde,Li Ran,He Suping,Aishi Wen,Lifei Feng,Mengting Cao,Xin-Xiang Zhang,Ruohai Jiang,Yang Wenbin
The mountmorinollite (MMT) nano clay, microcrystalline cellulose (MCC), and poly(Lactic acid) (PLA (MMT/MCC/PLA) composites with reinforced strength and toughness were prepared. This study aimed to develop MMT/MCC/PLA composite with improved thermal stability and flame rating based on reinforced strength and toughness. A simple and efficient method to hydrophobize MCC and intercalate the interlayer of MMT by mobilising cerium oxide nanoparticles (CeO 2 NP) bearing long-chain saturated fatty acid (Myristic acid; MA) to enhance compatibility with the PLA was adopted. The modified MCC (mMCC) and MMT (mMMT) were incorporated into PLA at different wt%. The flaming rating was studied by adding fire retardant (FR) into the composite. The mMCC, mMMT and their composites were characterised by Fourier Transformed Infrared spectroscopy(FTIR), Scanning Electron Microscopy(SEM), X-ray diffraction, Thermogravimetric analysis(TGA), UL-94 test, Limiting Oxygen Index(LOI), and mechanical analysis. FTIR and XRD confirmed the intercalation of MMT with the CeO 2 -MA and the mobilisation of CeO 2 -MA onto the surface of mMCC. SEM study showed the homogenous distribution of mMCC in the PLA matrix and revealed the layered clay structure with the deposition of nanoparticles into the clay interlayer space. The compatibility effect of the MA significantly improved the strength and toughness with more than 100% improvement in tensile strength of mMCC/PLA compared to neat PLA. The flame rating resulted in a 58.8% improvement in the LOI with the addition of the FR. The thermal stability was enhanced by the mMMT and mobility of CeO 2 NP into the interlayer space of the clay. The composite of mMCC/PLA, mMMT/PLA, and mMCC/mMMT/FR/PLA attained a V2, V1 and V0 rating in the UL-94 at a low FR addition. The improvement in fire retardancy did not significantly compromise the mechanical properties. The high mechanical performance of the mMCC/PLA presented MA as a potential fiber-matrix compatibiliser.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Gels
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2023
·Vol. 9
·期 4
·323
·
IF 4.6
Fushuai Wang,Lang Yang,Ye Sun,Yiming Cai,Xin Xu,Zhenzhong Liu,Qijie Liu,Hongliang Zhao,Chunxin Ma,Jun Liu
Hydrogel-based wet electrodes are the most important biosensors for electromyography (EMG), electrocardiogram (ECG), and electroencephalography (EEG); but, are limited by poor strength and weak adhesion. Herein, a new nanoclay-enhanced hydrogel (NEH) has been reported, which can be fabricated simply by dispersing nanoclay sheets (Laponite XLS) into the precursor solution (containing acrylamide, N, N′-Methylenebisacrylamide, ammonium persulfate, sodium chloride, glycerin) and then thermo-polymerizing at 40 °C for 2 h. This NEH, with a double-crosslinked network, has nanoclay-enhanced strength and self-adhesion for wet electrodes with excellent long-term stability of electrophysiology signals. First of all, among existing hydrogels for biological electrodes, this NEH has outstanding mechanical performance (93 kPa of tensile strength and 1326% of breaking elongation) and adhesion (14 kPa of adhesive force), owing to the double-crosslinked network of the NEH and the composited nanoclay, respectively. Furthermore, this NEH can still maintain a good water-retaining property (it can remain at 65.4% of its weight after 24 h at 40 °C and 10% humidity) for excellent long-term stability of signals, on account of the glycerin in the NEH. In the stability test of skin–electrode impedance at the forearm, the impedance of the NEH electrode can be stably kept at about 100 kΩ for more than 6 h. As a result, this hydrogel-based electrode can be applied for a wearable self-adhesive monitor to highly sensitively and stably acquire EEG/ECG electrophysiology signals of the human body over a relatively long time. This work provides a promising wearable self-adhesive hydrogel-based electrode for electrophysiology sensing; which, will also inspire the development of new strategies to improve electrophysiological sensors.Keywords:electrophysiology signals;hydrogel electrodes;nanoclay;self-adhesion;wearable sensors
研究领域:
生物医学工程
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材料科学
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电子工程
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产品关联
DOI
PubMed
高影响因子
POLYMER
·
2022
·
IF 4.432
Xinyue Zhang,Haimo Zhang,Min Zuo,Jun Zhong,Xuanyu Shi,Shihao Sun,Li Yang,Yihu Song,Qiang Zheng
The effect of selective distribution and migration behavior of two kinds of poly (methyl methacrylate)-grafted nanoclays (PMMA- g -clay) on the phase behavior of PMMA/poly (styrene- co -acrylonitrile) (SAN) blends is investigated. The grafting ratios of our two modified nanoclays are similar, but their grafting density and grafted chain lengths are different, resulting in their different initial locations and subsequent migration behaviors in the blend matrix. The PMMA- g -clay(d) nanosheets (NSs) with relatively dense and short chains are always distributed at the interfacial region and further form the percolation networks to block the concentration fluctuation and retard the domain coarsening of blend matrix more remarkably, while the PMMA- g -clay(s) NSs with relatively sparse and long chains are distributed at first in the SAN-rich domains and subsequently move slowly to the interfacial region, resulting in their inhibition of the phase separation for PMMA/SAN blend from retarding SAN chains’ viscous diffusion to their gradual interfacial aggregation for stabilizing the morphology. The variation of storage modulus for three systems in low frequency and long-time regimes are also affected by different selective distributions of two grafted clay NSs in PMMA/SAN blend matrix.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Minerals
·
2022
·Vol. 12
·期 9
·1097
·
IF 2.818
Dongyue Wang,Yuhang Meng,Aidong Tang,Huaming Yang
Engineered nanoparticle–support interaction is an effective strategy for tuning the structures and performance of engineered nanoparticles. Here, we show that tuning the dehydroxylation of kaolinite nanoclay as the support could induce zinc oxide–kaolinite interactions. We used free energy theory, electron microscopy, and X-ray photoemission spectroscopy to identify interaction strengths between metal oxides and the underlying nanoclay induced by dehydroxylation. Desirable exposure of nanoparticle sites and the geometrical and crystal structure were obtained by tuning the interface interactions between ZnO nanoparticles and nanoclay. The surface free energy of zinc oxide–nanoclay results in different interfacial interactions, and the properties of the surface free energy electron-donating (γ−) and electron-accepting (γ+) parameters have significant effects on the electron acceptor. This could, in turn, promote stronger interactions between zinc oxide and the kaolinite surface, which produce more active (0001) Zn-polar surfaces with promoting zinc oxide nanoparticles growing along the <0001> direction. Reactive oxygen species, leached zinc ions, and electron transfer can modulate the antibacterial activities of the samples as a function of interface free energy. This further demonstrates the interfacial interactions induced by dehydroxylation. This work has new application potential in biomedicine and materials science.Keywords:kaolinite;dehydroxylation;interfacial interactions;ZnO nanoparticles;antibacterial activities
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
✓ 已验证
产品关联
DOI
高影响因子
MACROMOLECULAR BIOSCIENCE
·
2024
·
IF 4.4
Kunyuan Han,Jishizhan Chen,Qinglin Han,Lei Sun,Xieping Dong,Gengqiang Shi,Runhuai Yang,Wenqing Wei,Yunzhang Cheng
Addressing complex tissue infections remains a challenging task because of the lack of effective means, and the limitations of traditional bioantimicrobial materials in single-application scenarios hinder their utility for complex infection sites. Hence, the development of a bioantimicrobial material with broad applicability and potent bactericidal activity is necessary to treat such infections. In this study, a layered lithium magnesium silicate nanoclay (LMS) is used to construct a nanobactericidal platform. This platform exhibits a sandwich-like structure, which is achieved through copper ion modification using a dopamine-mediated metallophenolic network. Moreover, the nanoclay is encapsulated within gelatin methacryloyl (GelMA) hydrogel microspheres for the treatment of complex tissue infections. The results demonstrate that the sandwich-like micro- and nanobactericidal hydrogel microspheres effectively eradicated Staphylococcus aureus (S. aureus) while exhibiting excellent biocompatibility with bone marrow-derived mesenchymal stem cells (BMSCs) and human umbilical vein endothelial cells (HUVECs). Furthermore, the hydrogel microspheres upregulated the expression levels of osteogenic differentiation and angiogenesis-related genes in these cells. In vivo experiments validated the efficacy of sandwich-like micro- and nanobactericidal hydrogel microspheres when injected into deep infected tissues, effectively eliminating bacteria and promoting robust vascular regeneration and tissue repair. Therefore, these innovative sandwich-like micro- and nanobacteriostatic hydrogel microspheres show great potential for treating complex tissue infections.
研究领域:
生物材料学
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组织工程学
·
感染病学
✓ 已验证
DOI
PubMed
高影响因子
LANGMUIR
·
2025
·
IF 3.9
Yinlei Lin,Sheng Sun,Deqiang Liu,Jiashang Yin,Zhipeng Yang,Dechao Hu,Junjie Deng,Huawen Hu,Guangji Li
Tissue adhesives are increasingly sought after for their potential to minimize invasiveness, simplify surgical procedures, and reduce operative times; however, conventional polyacrylamide (PAM)-based hydrogels are often hindered by irreversible bonding, which limits their reusability and compromises both mechanical integrity and self-healing ability. Motivated by the natural adhesion mechanisms of mussels, we have developed an innovative tissue adhesive hydrogel by incorporating polydopamine (PDA) and cysteine (Cys) into a PAM matrix via free radical polymerization, with polyethylene glycol diacrylate (PEGDA) serving as an effective cross-linker. In our system, PDA contributes essential catechol groups for strong tissue adhesion, while Cys not only preserves these groups from oxidation but also enhances hydrophilic interactions, resulting in a PDA-Cys-PAM hydrogel with a tensile strength of 23.4–30.7 kPa, a fracture elongation of 628–706%, and an elongation recovery of 48%. Significantly, the seamless integration of nanoclay into the hydrogel network further reinforces its structure and improves energy dissipation, leading to a marked enhancement of the self-healing performance─evidenced by an increase in the elongation recovery rate to 71.9%─without compromising the inherent mechanical properties. Moreover, in vitro assays with NIH3T3 cells demonstrate excellent biocompatibility, underscoring the potential of this synergistic design. Overall, our work not only elucidates the distinct and cooperative roles of PDA, Cys, and nanoclay but also represents a significant advancement in the design of reusable, high-performance tissue adhesives for potential applications in tissue repair and regeneration.
研究领域:
生物材料学
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再生医学
·
生物工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Yili Tang,Xiaoguang Zhao,Yihang Li,Zehui Yang,Xiaochao Zuo,Aidong Tang,Huaming Yang
The utilization of graphene aerogel encapsulated phase change materials (PCMs) presents a promising strategy to achieve solar-thermal energy conversion and storage. However, the self-stacking effect and inherent lattice defects in graphene aerogel significantly restrict its overall performance in the encapsulation of PCMs. Herein, interfacially self-assembled amino-attapulgite/graphene hybrid aerogels (GNA) are prepared via inspired by the mortise-tenon structure. Thanks to the structural regulation of the graphene aerogel by the amino-attapulgite nanofibers, the hybrid aerogels establish a continuous heat transfer pathway inside and ensure stable encapsulation of PCMs. The solar-driven shape-stabilized composite PCMs (LA/GNAb) based on GNAb impregnated with lauric acid (LA), which achieves coordinated enhancement of the effective encapsulation rate for LA (93.1%), thermal conductivity (1.164 W m −1 K −1 ), and photothermal conversion capability (90.5%). Drawing upon the photothermal conversion and thermal storage properties of LA/GNAb, this study demonstrates its advanced applications in solar-driven desalination and solar-thermoelectric generation. The evaporator and generator with integrated LA/GNAb show a high evaporation rate of 2.13 kg m −2 h −1 and a stable power density of 1.57 W m −2 under 1-sun irradiation, respectively, which can sustain additional operating time even under the dark. This work provides new insight into the design of multifunctional solar-driven thermal interfacial materials.
研究领域:
材料科学
·
能源工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2018
·
IF 3.789
Jiabo Shi,Chunhua Wang,To Ngai,Wei Lin
Understanding accessibility and interactions of clay nanoparticles with collagen fibers is an important fundamental issue for the conversion of collagen to leather matrix. In this study, we have investigated the diffusion and binding of Laponite into the collagen fiber network. Our results indicate that the diffusion behaviors of Laponite into the collagen exhibit the Langmuir adsorption, verifying its affinity for collagen. The introduction of Laponite leads to a shift in the isoelectric point of collagen from ∼6.8 to ∼4.5, indicating the ionic bonding between the positively charged amino groups of the collagen and negatively charged Laponite under the tanning conditions. Fluorescence microscopy, atomic force microscopy, field-emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and wide-angle X-ray diffraction analyses reveal that Laponite nanoparticles can penetrate into collagen microstructure and evenly distributed onto collagen fibrils, not altering native D-periodic banding patterns of collagen fibrils. Attenuated total reflectance-Fourier transform infrared and Raman spectroscopy detections further demonstrate the presence of noncovalent interactions, namely, ionic and hydrogen bonding, between Laponite and collagen. These findings provide a theoretical basis for the use of Laponite as an emerging tanning agent in leather manufacture.
研究领域:
材料科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Small
·
2023
·Vol. 19
·期 30
·2300770
·
IF 13.3
Shilin Zhang,Qingjie Wang,Peng Zhang,Jie Wang,Yue Li,Chang Lu,Muhammad Tariq Sarwar,Xiongbo Dong,Qihang Zhao,Aidong Tang,Liangjie Fu,Huaming Yang
To achieve a high separation efficiency of photogenerated carriers in semiconductors, constructing high-quality heterogeneous interfaces as charge flow highways is critical and challenging. This study successfully demonstrates an interfacial chemical bond and internal electric field (IEF) simultaneously modulated 0D/0D/1D-Co 3 O 4 /TiO 2 /sepiolite composite catalyst by exploiting sepiolite surface-interfacial interactions to adjust the Co 2+ /Co 3+ ratio at the Co 3 O 4 /TiO 2 heterointerface. In situ irradiation X-ray photoelectron spectroscopy and density functional theory (DFT) calculations reveal that the interfacial Co 2+ O Ti bond (compared to the Co 3+ O Ti bond) plays a major role as an atomic-level charge transport channel at the p-n junction. Co 2+ /Co 3+ ratio increase also enhances the IEF intensity. Therefore, the enhanced IEF cooperates with the interfacial Co 2+ O Ti bond to enhance the photoelectron separation and migration efficiency. A coupled photocatalysis-peroxymonosulfate activation system is used to evaluate the catalytic activity of Co 3 O 4 /TiO 2 /sepiolite. Furthermore, this work demonstrates how efficiently separated photoelectrons facilitate the synergy between photocatalysis and peroxymonosulfate activation to achieve deep pollutant degradation and reduce its ecotoxicity. This study presents a new strategy for constructing high-quality heterogeneous interfaces by consciously modulating interfacial chemical bonds and IEF, and the strategy is expected to extend to this class of spinel-structured semiconductors.
研究领域:
材料科学
·
环境科学
·
催化科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）