IONICS
·
2022
·Vol. 28
·期 7
·3217-3222
·
IF 2.961
Du Gang,Zhao Jinguo,Yang Hongwei
Lithium-sulfur batteries with high theoretical energy density have drawn much attention during the past decades, while the shuttle effect of the polysulfide also hinders the practical application. The employment of suitable host materials has been considered as the effective strategy to inhibit the polysulfide migration. In this work, we develop MoO 2 /C composite as sulfur host material to increase the capacity of lithium-sulfur batteries while retaining high capacity after cycles. The MoO 2 /C composite could serves as active sites, effectively adsorbing and catalytically converting polysulfide, thus improving the redox kinetics and reducing shuttle effect. Owing to these merits, the as-prepared MoO 2 /C@S cathodes exhibit high capacity of 1165 mAh g −1 at 0.1 C. Meanwhile, the battery exhibits superior rate capability and stable cycling performance.
研究领域:
储能
·
材料科学
·
电化学
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DOI
高影响因子
GLYCOCONJUGATE JOURNAL
·
2012
·Vol. 30
·期 6
·577-583
·
IF 2.117
Zhang Wuxia,Mu Haibo,Zhang Amin,Cui Guoting,Chen Hua,Duan Jinyou,Wang Shunchun
The linear non-sulfated glycosaminoglycan, hyaluronic acid (HA), is widely distributed throughout connective, epithelial and neural tissues etc., and is of great importance in tissue hydration, lubrication and cellular function. Along with the age growth, HA will lose its acetyl groups under action of HA N -deacetylase in vivo . However, the biological consequence of this physiological process remains largely unknown. Herein two highly N -deacetylated HAs, dHA-6 and dHA-10 were generated via the NH 2 NH 2 -HIO 3 procedure. Their molecular weights were estimated to be 24 and 16 kDa by high performance gel-permeation chromatography (HPGPC), and the N -deacetylation degrees were 79.4 % and 93 % respectively, as determined by 1 H nuclear magnetic resonance (NMR). The study on moisture-absorption ( Ra ) and -retention ( Rh ) abilities demonstrated that the Ra values of dHAs under conditions of 81 % or 43 % relative humidity, as well as the Rh values of dHAs under dry condition or 43 % relative humidity, were significantly smaller than that of their respective re- N -acetylated products. The decline of moisture-absorption and –retention capacity after HA N -deacetylation were consistent with the appearance of unsolvated amides remained in the N -deacetylated products, as indicated by circular dichroism (CD) spectroscopy. Our findings implied that HA N -deacetylation, in addition to the decrease of HA contents in the elderly persons, might account for manifestations of naturally aged skin, such as laxity, sagging, and wrinkling.
研究领域:
生物化学
·
皮肤科学
·
糖生物学
·
衰老研究
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DOI
高影响因子
Science China-Materials
·
2019
·Vol. 63
·期 3
·392-402
·
IF 5.636
Yang Xiao,Li Xiao-Ming,Kong Qing-Qiang,Liu Zhuo,Chen Jing-Peng,Jia Hui,Liu Yan-Zhen,Xie Li-Jing,Chen Cheng-Meng
Stable aqueous carbon inks, with graphene sheets (GSs) and carbon black (CB) as conductive fillers, are prepared by a simple one-pot ball-milling method. The as-prepared composite ink with 10 wt% GSs shows optimized rheological properties (viscosity and thixotropy) for screen printing. The as-printed coatings based on the above ink are uniform and dense on a polyimide substrate, and exhibit a sandwich-type conductive three dimensional network at the microscale. The resistivity of the typical composite coating is as low as 0.23±0.01 Ω cm (92±4 Ω sq −1 , 25 µm), which is 30% as that of a pure CB coating (0.77±0.01 Ω cm). It is noteworthy that the resistivity decreases to 0.18±0.01 Ω cm (72±4 Ω sq −1 , 25 µm) after a further rolling compression. The coating exhibits good mechanical flexibility, and the resistance slightly increases by 12% after 3000 bending cycles. With the CB/GSs composite coatings as a flexible conductor, fascinating luminescent bookmarks and membrane switches were fabricated, demonstrating the tremendous potential of these coatings in the commercial production of flexible electronics and devices.
研究领域:
材料科学
·
纳米技术
·
电子工程
·
印刷电子
·
复合材料
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DOI
高影响因子
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2018
·Vol. 124
·期 4
·283
·
IF 1.604
Zhang Zhi Feng,Ma Xinxian,Wang Haibin,Ye Fei
This paper studies the influences of fabrication parameters on the optical properties of poly(ethylene glycol) diacrylate(PEGDA) hydrogels during polymerization, including the irradiation intensity, irradiation time, photoinitiator concentration, and water content. The refractive index of PEGDA hydrogels polymerized under various conditions is measured, with the results shown to be valuable for future research applying PEGDA hydrogels as optical materials. In addition, it is found that the photoinitiator concentration used can be as low as 1.0 wt%, which is severalfold lower than that previously reported, making PEGDA hydrogels more desirable for bioapplications.
研究领域:
材料科学
·
高分子化学
·
光学材料
·
生物医学工程
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 24
·20978-20983
·
IF 2.324
Wen Zheng,Yang Jiahao,Ding Huizhen,Zhang Wule,Wu Di,Xu Junmin,Shi Zhifeng,Xu Tingting,Tian Yongtao,Li Xinjian
In this paper, a new method was proposed to improve the sensitivity of capacitive-type pressure sensors by using the high dielectric constant materials as dielectric layer of sensors. The porous multi-wall carbon nanotubes (MWCNTs)/Ecoflex elastomer composites with high dielectric constant were prepared to serve as dielectric layers of capacitive-type pressure sensors. The MWCNTs/Ecoflex elastomer composite sensors show ultra-high sensitivity of 2.306 kPa −1 , wide dynamic range and low hysteresis. The as-prepared sensors can monitor the response to pressure below 2.6 Pa. Moreover, they have exhibited excellent performances in promising practical applications as wearable devices in detecting pulses of carotid artery and heartbeats. This strategy proposed here presents a promising way to obtain high performance pressure sensors for applications in E-skin, robotics, wearable medical aids and real-time tactile sensing systems.
研究领域:
柔性电子学
·
传感器与传感技术
·
可穿戴设备
·
电子皮肤（E-skin）
·
材料科学
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DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2026
·Vol. 28
·期 6
·139
·
IF 3.5
Luo Haoyu,Liu Feng,Li Jiale,Wang Tao,Lv Lianpeng,Wang Bing
Reactive oxygen species (ROS)-mediated therapeutic modalities, including photodynamic therapy (PDT) and copper ion-mediated chemodynamic therapy (CDT), have been recognized as highly promising non-invasive strategies for cancer treatment. However, their therapeutic efficacy is frequently restricted by poor subcellular targeting capability. To address this challenge, a mitochondria-targeted nanoplatform (Cu@GO-PEG-Ce6/TPP) was developed for light-triggered ROS therapy. Driven by triphenylphosphine (TPP) moieties, selective accumulation of the nanoplatform within mitochondria was achieved. Upon single 660 nm laser irradiation, singlet oxygen ( 1 O 2 ) was generated by the photosensitizer Ce6 to execute the PDT effect, while the loaded copper ions catalyzed endogenous H 2 O 2 within tumor cells through a Fenton-like reaction, leading to in situ production of highly toxic hydroxyl radicals (•OH) to fulfill the CDT function. Additionally, mild photothermal effect (PTT) was produced by the graphene oxide scaffold, with a photothermal conversion efficiency of 22.48%, through which the Fenton-like reaction rate was thermodynamically accelerated, thereby achieving synergistic PTT–CDT enhancement. The combination of mitochondrial localization and mild hyperthermia triggered an amplified local ROS burst. In vitro cellular experiments demonstrated that, under 660 nm laser irradiation at 0.5 W/cm 2 , a tumor cell killing rate of 75.89% was achieved through PDT/CDT/PTT trimodal synergistic effects, and cancer cell apoptosis was significantly enhanced. Consequently, this work provides a novel strategy for precision cancer therapy by co-localizing ROS generation and mild hyperthermia at the most vulnerable subcellular site.
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 52
·期 2
·1375-1384
·
IF 2.047
Shi Chonghua,Fu Hang,Nie Jiajin,Yao Shaowei
A composite material of Co/N-doped porous carbon was derived from a zeolite imidazolate framework (Zn/Co-ZIF) precursor, which exhibited a controllable microstructure and high specific surface area. In order to study the microwave absorption properties of the composites, the Zn/Co-ZIFs were heat-treated at 930°C in a N 2 atmosphere to obtain the composites, in which Co nanoparticles were distributed uniformly in N-doped porous carbon (Co/C composites). Through N 2 adsorption and desorption testing, the specific surface area of the Co/C composites was about 333.5 m 2 g −1 , and the Barrett−Joyner−Halenda (BJH) pore size distribution was 5.7131 nm, with the majority of pores at mesoporous scale. The microwave absorption properties of Co/C composites with different content were then analyzed, revealing that the Co/C composite with absorbent content of 15 wt.% had the smallest reflection loss (−46.36 dB) at a thickness of 3.1 mm. Based on these results, the Co/C composites not only have the advantages of high specific surface area and special porous structure, but with the appropriate absorbent content, the Co/C composites show excellent microwave absorption performance.
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高影响因子
RARE METALS
·
2022
·Vol. 42
·期 3
·916-928
·
IF 6.318
Hu Jin-Zhi,Liu Wen-Jie,Zheng Ji-Hua,Li Guo-Chun,Bu Yong-Feng,Qiao Fen,Lian Jia-Biao,Zhao Yan
Cobalt selenide (CoSe 2 ) has become a promising anode material for sodium-ion batteries (SIBs) due to its stable chemical properties, environmental friendliness, and high theoretical capacity. However, the undesirable rate capacity and cycle stability of the anode materials largely limit its applications for SIBs due to the relatively low electronic conductivity and huge volume change during the Na + insertion/extraction. In this study, electrostatic spinning combined with a wet chemical method is employed to synthesize coral-like composite material (CNF@c-CoSe 2 /C), which is composed of CoSe 2 /carbon nanosheet arrays (CoSe 2 /C) and carbon nanofibers (CNFs). CoSe 2 /C nanoflakes derived from metal-organic frameworks (MOFs) with high surface area and the porous structure can inhibit the pulverization and amorphization of CoSe 2 during charge and discharge processes, thus significantly keeping the stability of the microstructure. CNF can limit the overgrowth of nanosheets and serve as a conductive skeleton. Compared to two-dimensional CoSe 2 /C nanoflakes and pure CoSe 2 nanoparticles, the composite can expose more active sites and effectively accelerate the diffusion of Na + , which displays enhanced rate capability (266.5 mAh·g −1 at 5.0 A·g −1 ) and cycling stability (268.3 mAh·g −1 after 100 cycles at 1.0 A·g −1 ). Moreover, the rational preparation strategy for metal selenide-based heterostructure material presents a new way for high-performance SIBs. Graphical abstract
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高影响因子
Nano-Micro Letters
·
2022
·Vol. 15
·期 1
·1-14
·
IF 23.655
Liang Jiajie,Wang Shaojie,Luo Zhen,Fu Jing,Hu Jun,He Jinliang,Li Qi
Ferroelectric polymer nanocomposites possess exceptional electric properties with respect to the two otherwise uniform phases, which is commonly attributed to the critical role of the matrix–particle interfacial region. However, the structure–property correlation of the interface remains unestablished, and thus, the design of ferroelectric polymer nanocomposite has largely relied on the trial-and-error method. Here, a strategy that combines multi-mode scanning probe microscopy-based electrical characterization and nano-infrared spectroscopy is developed to unveil the local structure–property correlation of the interface in ferroelectric polymer nanocomposites. The results show that the type of surface modifiers decorated on the nanoparticles can significantly influence the local polar-phase content and the piezoelectric effect of the polymer matrix surrounding the nanoparticles. The strongly coupled polar-phase content and piezoelectric effect measured directly in the interfacial region as well as the computed bonding energy suggest that the property enhancement originates from the formation of hydrogen bond between the surface modifiers and the ferroelectric polymer. It is also directly detected that the local domain size of the ferroelectric polymer can impact the energy level and distribution of charge traps in the interfacial region and eventually influence the local dielectric strength.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF POROUS MATERIALS
·
2022
·Vol. 30
·期 3
·871-880
·
IF 2.523
Jiang Wen-Hong,Yang Jian
Brittleness and pulverization have troubles with phenolic porous material application in thermal insulation and mechanical elasticity. Here, we fabricated phenolic/polydimethylsiloxane composites by surface modification and sol impregnation method, it reduced the thermal conductivity and enhanced toughness. Polydimethylsiloxane (PDMS) was used as a bonding point to connect the phenolic structure, when a load was applied, the existence of wrinkles and the interface interaction effectively consumes energy so that the resorcinol-formaldehyde/PDMS materials had cyclic compressibility. Composite materials show better mechanical elasticity and thermal insulation compared to modified resorcinol formaldehyde (RF) foam. After interfacial modification and coating by different sol concentrations, the thermal conductivity significantly decreased from 0.105 to 0.75 Wm −1 K −1 . Moreover, the compression strength of PDMS/RFSi0.6 increased from 0.05 to 0.7 MPa. This work paves a simple and effective way to simultaneously enhance thermal insulation performance and mechanical properties of organic porous materials.
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DOI
高影响因子
Cell Death & Disease
·
2022
·Vol. 13
·期 11
·1-13
·
IF 9.685
Chen Shiyu,Cai Kun,Zheng Dijie,Liu Yanqing,Li Lin,He Zhiwei,Sun Chengyi,Yu Chao
Pancreatic cancer (PC) is one of the most malignant types of cancer, and is characterized by early metastasis, limited response to chemotherapeutics, and poor prognosis. Therefore, there is an urgent need to explore new therapeutic strategies for PC treatment. Human rhomboid-like 2 (RHBDL2) is differentially expressed in cervical and breast cancer. However, the correlation between RHBDL2 and PC remains unclear. We found that RHBDL2 is highly expressed in human PC cells and tissues and is significantly associated with distant metastasis and poor survival of patients with PC. Gain- and loss-of-function assays indicated that RHBDL2 could accelerate PC cell proliferation and mobility in vitro and in vivo. The RNA-Seq results suggest that RHBDL2 may be involved in the activation of Notch signaling pathway. IMR-1 could restore the proliferation and metastatic capacity of PC cells mediated by RHBDL2. RHBDL2 interacted with and cleaved Notch1, resulting in the release of N1ICD. RHBDL2 decreased the ubiquitination level of N1ICD and collaborated with Ovarian tumor domain-containing 7B (OTUD7B) to stabilize N1ICD via the ubiquitin-proteasome pathway. RHBDL2 facilitated PC cell proliferation and mobility by stabilizing the N1ICD via the OTUD7B and activating the Notch signaling pathway. Thus, targeting this novel pathway may be a potential therapeutic strategy for PC.
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产品关联
DOI
PubMed
高影响因子
POLYMER JOURNAL
·
2022
·Vol. 55
·期 1
·13-25
·
IF 3.135
Hongbo Tang,Manxin Wang,Yanping Li,Xiaojun Liu
Octenyl succinate hydroxypropyl acidolysis tamarind gum (OSA-HATG) with a high substitution degree of ester groups was first synthesized using hydroxypropyl acidolysis tamarind gum (HATG) as a raw material, 1-butyl-3-methylimidazolium chloride (ionic liquid) as a solvent, octenyl succinic anhydride (OSA) as an acylating agent, and 4-dimethylamino pyridine (DMAP) as a catalyst. The results showed that OSA-HATG, as a new emulsifier, has good emulsification capacity and stability. The emulsifying capacity of OSA-HATG increased with increasing substitution degree. Acidolysis (acid hydrolysis) and hydroxypropylation were mainly conducted on the large particles of TG. The stretching vibration peaks of the C=O bonds at 1735 cm −1 and C=C bonds at 1654 cm −1 indicated that the acylation of HATG by OSA was successfully accomplished. TG was almost amorphous. The acylation resulted in a reduction in the thermal stability of OSA-HATG but obviously increased the contact angle of OSA-HATG (102.7°). The addition of TG and its derivatives did not improve the setback of potato starch. The acidolysis and hydroxypropylation could swell the TG particles.
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高影响因子
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