Nano Research
·
2021
·Vol. 15
·期 2
·838-844
·
IF 8.897
Wu Hao,Cheng Xiaoyu,Dong Hongguang,Xie Songjun,He Sailing
Sub-3 nm aluminum (Al) nanocrystal is an emerging class of nanomaterial with properties distinct to noble metal nanoclusters. The complete solution synthesis of aluminum nanoclusters was recently reported, and their photoluminescence (PL) observed for the first time. At the moment, there exists no method to tune the size of ultrasmall aluminum nanocrystals in solution thus no knowledge on the boundary state between aluminum nanoclusters to plasmonic nanoparticles. In this work, it is demonstrated a study of size-controlled solution synthesis of ultrasmall aluminum nanocrystals with size controlled between ∼ 2.2 to ∼ 3.8 nm. Increasing the size results in three sets of spectral responses: (1) absorption due to nascent plasmons generated at ∼ 340 nm for larger particles, confirmed by Mie theory calculations; (2) significant decreased quantum yield of PL from ∼ 7.8% to ∼ 2.4%, indicating reduced quantum confinement effects and increased metallicity; (3) drop of fluorescence lifetime was observed, especially when the diameter of aluminum nanoparticles was changed from ∼ 3.0 to ∼ 3.8 nm. This study provides experimental evidence and insights to the transitional state between aluminum nanoclusters to plasmonic nanoparticles, which seems to occur at size larger than gold nanoclusters.
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Nature Communications
·
2021
·Vol. 12
·期 1
·1-10
·
IF 14.919
Hu Jing,Tang Xiaomin,Dai Qing,Liu Zhiqiang,Zhang Huamin,Zheng Anmin,Yuan Zhizhang,Li Xianfeng
Membranes with fast and selective ions transport are highly demanded for energy storage devices. Layered double hydroxides (LDHs), bearing uniform interlayer galleries and abundant hydroxyl groups covalently bonded within two-dimensional (2D) host layers, make them superb candidates for high-performance membranes. However, related research on LDHs for ions separation is quite rare, especially the deep-going study on ions transport behavior in LDHs. Here, we report a LDHs-based composite membrane with fast and selective ions transport for flow battery application. The hydroxide ions transport through LDHs via vehicular (standard diffusion) & Grotthuss (proton hopping) mechanisms is uncovered. The LDHs-based membrane enables an alkaline zinc-based flow battery to operate at 200 mA cm −2 , along with an energy efficiency of 82.36% for 400 cycles. This study offers an in-depth understanding of ions transport in LDHs and further inspires their applications in other energy-related devices.
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Communications Biology
·
2021
·Vol. 4
·期 1
·1-14
·
IF 6.268
Geng Yingnan,Duan Huichuan,Xu Liang,Witman Nevin,Yan Bingqian,Yu Zheyuan,Wang Huijing,Tan Yao,Lin Liqin,Li Dong,Bai Shanshan,Fritsche-Danielson Regina,Yuan Jie,Chien Kenneth,Wei Min,Fu Wei
Bone has a remarkable potential for self-healing and repair, yet several injury types are non-healing even after surgical or non-surgical treatment. Regenerative therapies that induce bone repair or improve the rate of recovery are being intensely investigated. Here, we probed the potential of bone marrow stem cells (BMSCs) engineered with chemically modified mRNAs (modRNA) encoding the hBMP-2 and VEGF-A gene to therapeutically heal bone. Induction of osteogenesis from modRNA-treated BMSCs was confirmed by expression profiles of osteogenic related markers and the presence of mineralization deposits. To test for therapeutic efficacy, a collagen scaffold inoculated with modRNA-treated BMSCs was explored in an in vivo skull defect model. We show that hBMP-2 and VEGF-A modRNAs synergistically drive osteogenic and angiogenic programs resulting in superior healing properties. This study exploits chemically modified mRNAs, together with biomaterials, as a potential approach for the clinical treatment of bone injury and defects.
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JOURNAL OF ELECTRONIC MATERIALS
·
2021
·Vol. 50
·期 4
·2182-2189
·
IF 1.938
Feng Yefeng,Zhao Xiaomiao,Chen Peiyao,Bo Maolin,Deng Qihuang,Zhao Anning,Fu Junjie
High-dielectric-constant (high- k ) polymer–ceramic composites with low-level dielectric loss are expected to enable excellent energy storage. However, high conductivity and high dielectric loss often occur simultaneously with high dielectric constant. To obtain a high dielectric constant but with low conductivity and low dielectric loss, in this work, we studied the ternary polyvinylidene fluoride (PVDF)/La 2 TiO 5 /V 2 C dielectric composite system, which takes advantage of the synergistic effect between the high content (0 wt.% to 40 wt.%) of pseudo-perovskite filler La 2 TiO 5 and the low content (2 wt.%) of highly conductive two-dimensional filler V 2 C. Comparisons with the binary PVDF/La 2 TiO 5 composite system revealed that the ternary PVDF/La 2 TiO 5 /V 2 C composite dielectric system enabled balance and optimization of the comprehensive electrical properties of the composite material. Significantly elevated permittivity as well as depressed low-level dielectric loss were obtained in the ternary composites. The optimized ternary composite with 40 wt.% La 2 TiO 5 and 2 wt.% V 2 C exhibited high dielectric constant of 47 and low dielectric loss of 0.17 at 1 kHz. This work might enable facile fabrication of promising composite dielectric materials based on this excellent synergetic filler strategy.
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MICROCHIMICA ACTA
·
2021
·Vol. 188
·期 2
·1-12
·
IF 5.833
Hong Juncheng,Wang Wenhai,Wang Jiaqi,Wang Xiao,Xie Hongzhen,Li Tianhua,Gan Ning
A pair of composite probes based on aptamer modified polyhedral oligomeric silsesquioxane-perovskite quantum dots (POSS-PQDs-Apt) as signal probe and titanium carbide (Ti 3 C 2 ) MXenes as quencher were prepared for the first time. They were employed to fabricate one turn-on–type aptasensor relying on fluorescence resonance energy transfer (FRET) for Vibrio parahaemolyticus (VP) determination. The POSS-PQDs-Apt can be adsorbed on the MXenes nanosheets, and its fluorescence was quenched due to the FRET. After the composite probes were incubated with VP for 50 min, the POSS-PQDs-Apt binding with VP can be released from the surface of MXenes, and the signal recovered due to its higher affinity to the VP than MXenes. The fluorescence intensity from 519 nm emission of the system was measured at 480 nm excitation. Under In optimized conditions, the assay can determine VP in the concentration range 10 2 - 10 6 cfu/mL, and the detection limit (LOD) was 30 cfu/mL using fluorescence detection. The LOD is still 100 cfu/mL by naked eye detection which is proper for on-line monitoring VP in aquaculture water. This method was also used to detect VP in actual samples of seawater, the recovery of spiked samples was between 93% and 106%, and relative standard deviation (RSD) was between 2.7% and 6.7%. The result is consistent with the plate count. Therefore, this assay could provide a candidate platform for screening VP in aquaculture industry. Graphical abstract
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Journal of Thermal Science
·
2021
·Vol. 30
·期 6
·2002-2014
·
IF 2.438
Shao Xuefeng,Yang Sheng,Chen Chenlin,Fan Liwu,Yu Zitao
The temperature-dependent rheological behaviors of five selected binary eutectic mixture sugar alcohols, with great potential for latent heat storage in the range of 353.15 K to 523.15 K, were investigated. It was found that the rheological behaviors of the mixture sugar alcohols depend on those of the pure compounds as well as their molar ratios. The two mixtures of xylitol (75 mol%)+erythritol and erythritol (84 mol%)+d-mannitol behave like pseudoplastic fluids with typical non-Newtonian shear-thinning behaviors, as indicated by the power law index of 0.99 (<1). The mixture of d-mannitol (70 mol%)+d-dulcitol is a nonlinear Bingham fluid, exhibiting a slight yield stress (0.001 Pa to 0.01 Pa) at low shear rates. The rest two mixtures containing the cyclic-structured inositol behave like Herschel-Bulkley fluids. The infinite shear viscosities of the eutectic mixtures over the entire temperature range appear to be higher than those of their respective pure compounds, except for inositol. The mixture of xylitol (75 mol%)+erythritol at its melting point shows higher dynamic viscosity of about 0.546 Pa·s than the values of about 0.396 Pa·s and 0.035 Pa·s for xylitol and erythritol, respectively. In addition, the activation energies of viscous flow of the mixtures, as determined by fitting the dynamic viscosity-temperature curves using the Arrhenius model, also exhibit higher values than those of their pure compounds. The activation energy of viscous flow of the mixture xylitol (75 mol%)+erythritol was determined to be about 92 400 J/mol in the supercooled liquid state, while the supercooled liquid xylitol and erythritol have much lower values of 83 500 J/mol and 51 900 J/mol, respectively. Both the increased dynamic viscosities and activation energies of viscous flow can result in deteriorated crystallization performance during latent heat retrieval.
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-12
·
IF 4.38
Ma Lan,Yu Yijun,Liu Hanxiao,Sun Weibin,Lin Zitong,Liu Chao,Miao Leiying
The repair of skeletal defects in maxillofacial region remains an intractable problem, the rising technology of bone tissue engineering provides a new strategy to solve it. Scaffolds, a crucial element of tissue engineering, must have favorable biocompatibility as well as osteoinductivity. In this study, we prepared berberine/polycaprolactone/collagen (BBR/PCL/COL) scaffolds with different concentrations of berberine (BBR) (25, 50, 75 and 100 μg/mL) through electrospinning. The influence of dosage on scaffold morphology, cell behavior and in vivo bone defect repair were systematically studied. The results indicated that scaffolds could release BBR stably for up to 27 days. Experiments in vitro showed that BBR/PCL/COL scaffolds had appropriate biocompatibility in the concentration of 25–75 μg/mL, and 50 and 75 μg/mL scaffolds could significantly promote osteogenic differentiation of dental pulp stem cells. Scaffold with 50 μg/mL BBR was implanted into the critical bone defect of rats to evaluate the ability of bone repair in vivo. It was found that BBR/PCL/COL scaffold performed more favorable than polycaprolactone/collagen (PCL/COL) scaffold. Overall, our study is the first to evaluate the capability of in vivo bone repair of BBR/PCL/COL electrospun scaffold. The results indicate that BBR/PCL/COL scaffold has prospective potential for tissue engineering applications in bone regeneration therapy.
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Nature Communications
·
2021
·Vol. 12
·期 1
·1-10
·
IF 14.919
Li Xiangyu,Liu Jingjing,Qu Ruixiang,Zhang Weifeng,Liu Yanan,Zhai Huajun,Wei Yen,Hu Hanshi,Feng Lin
Superwetting porous membranes with tunable liquid repellency are highly desirable in broad domains including scientific research, chemical industry, and environmental protection. Such membranes should allow for controllable droplet bouncing or spreading, which is difficult to achieve for low surface energy organic liquids (OLs). Here we develop an interfacial physical parameter to regulate the OL wettability of nanoparticle-embedded membranes by structuring synergistic layers with reconfigurable surface energy components. Under the tunable solid-liquid interaction in the aggregation-induced process, the membranes demonstrate positive/negative liquid gating regularity for polar protic liquids, polar aprotic liquids, and nonpolar liquids. Such a membrane can be employed as self-adaptive gating for various immiscible liquid mixtures with superior separation efficiency and permeation flux, even afford successive achievement of high-performance in situ extraction-back extraction coupling. This study should provide distinctive insights into intrinsic wetting behaviors and have pioneered a rational strategy to design high-performance separation materials for diverse applications.
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FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 9
·1927-1937
·
IF 1.797
Nong Yelin,Zhou Zhou,Yuan Jiugang,Wang Ping,Yu Yuanyuan,Wang Qiang,Fan Xuerong
Generally, dyeing and finishing of Bombyx mori silk fibers were proceeded at high temperature, which has the disadvantages of overmuch energy-consumptions. In the present work, bio-inspired in situ coloring and functionalization of silk fabric were carried out via laccase-catalyzed graft polymerization of arylamines, including aniline (ANI) and p -phenylenediamine (PPD). p -Hydroxyphenylacetamide (PHAD) as the model compound of tyrosine residues in silk fibroin (SF) was used to explore the mechanism of graft polymerization by means of MALDI-TOF MS. The actions of the dopants of sodium dodecyl benzene sulfonate (SDBS) and sodium p -aminobenzenesulfonate (ABSA) on the enzymatic treatment were also concerned. The results indicated that laccase might initiate the self-polymerizations of ANI and PPD, respectively, and formed the copolymers of arylamine and PHAD subsequently. High color depth and color fastness were obtained after incubation silk fabric with laccase and arylamines, companying with a noticeable pH-responsiveness. The laccase-mediated treatment endowed silk fabric with antibacterial and antioxidant abilities, meanwhile, the addition of dopants of SDBS and ABSA promoted the enzymatic finishing. Enzymatic graft polymerization of arylamine onto silk fibroin provides a novel approach for dyeing and functionalization of silk fabrics under mild treating conditions.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 11
·1-10
·
IF 2.132
Yang Yunjiang,Zhu Xiaowei,Bao Jinrong,Bai He,Wu Anping,Qiao Yan,Bian Yulong,Zhao Xin,Li Wenxian,Liu Ying
In this study, the core/shell/shell-structured SiO 2 /YPO 4 :Nd/SiO 2 composite microspheres with near-infrared luminescence property were prepared by sol-gel method. The morphology and structure of the as-prepared microspheres were observed by transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and infrared spectroscopy (IR). These tests show that the composite microspheres have a sandwich structure. The diameter of the core SiO 2 microspheres is ~ 220 nm, the intermediate layer thickness of rare-earth phosphate is ~ 5 nm, and the outer SiO 2 layer is ~ 20 nm thick. The core/shell/shell microspheres are emitted at 1063 nm in the near-infrared region, which attributes to optical transparent windows of biological tissues. Meanwhile, the interaction between the composite microspheres and bovine serum albumin (BSA) was investigated. The results showed that the composite microspheres could quench the emission intensity of BSA by binding the tryptophan residues in BSA. The synthesized core/shell/shell composite microspheres may be used as near-infrared luminescence probes in the field of biological tissue imaging.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2020
·Vol. 31
·期 17
·14977-14985
·
IF 2.22
Luo Wenjie,Wang Jie,Zhang Zhen,Lu Donglin,Yu Yang,Ji Yuan,Qiao Hui,Qi Xiang,Liu Yundan
The development of effective but earth-abundant electrocatalysts for hydrogen evolution is still a great challenge. Non-noble metal-based multi-phase nanocomposites are regarded as emerging catalysts for efficient catalysts, but their practical application is still hindered by the lack of both satisfying activity and cost-effective synthesis. In this work, ternary CoSe 2 /MoO 2 /MoSe 2 nanocomposites with controllable phases have been successfully synthesized by simply direct selenization of cobalt molybdate (CoMoO 4 ) nanorods. Compared with related pure Mo-based and Co-based counterparts, the electric conductivity and the active sites of the as-prepared ternary nanocomposites have been both increased due to the synergistic effects. The as-prepared ternary CoSe 2 /MoO 2 /MoSe 2 nanocomposites electrocatalysts demonstrated superior HER performance which only requiring an overpotential of 229 mV for reaching 10 mA/cm 2 current density in acidic media.
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Journal of Inorganic and Organometallic Polymers and Materials
·
2020
·Vol. 31
·期 1
·203-208
·
IF 1.941
Hua Weiwen,Wang Yuanguang,Guo Cun-Yue,Wang Jianjun,Li Songjun,Guo Li
Natural antifreeze proteins are known for their excellent control of ice formation and growth, while synthetic molecules seldom have the similar effects. Here we report a series of protein mimetic peptoids with different side chains exhibiting significant ice recrystallization inhibition activity, and their structure–property relationships are also studied. The presence of peptoid can clearly slow down ice growth and decrease ice crystal grain size, but shows no thermal hysteresis, which make peptoids great antifreeze agent candidates in cryopreservation. Peptoids with methyl, ethyl and amino groups on side chains can modulate ice crystal shape, while peptoids bearing hydroxyl and ethyl groups decrease ice growth rate the most. All peptoids can reduce ice crystal grain size and the one with hydroxyl groups give the smallest grain size. This study reveals peptoid structure effects on ice growth and points to the design rules for biomimetic antifreeze agents.
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