COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2018
·
IF 4.514
Gaowei Yuan,Bing Yang,Yinghong Chen,Yinggang Jia
Through reaction of the active functional groups on framework of Graphene oxide (GO) with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and cage octaminopropyl silsesquioxane (oapPOSS), a novel multi-structure synergistic graphene-based ternary graft flame retardant oapPOSS-graft-GO-graft-DOPO (P G D) was designed and synthesized successfully. The obtained P G D was then applied in PP flame retardation. Compared with pure PP, the peak heat release rate and total heat release of PP composite are reduced by 78.0% and 44.9% via adding 25 wt% P G D. These notable reductions in fire hazards are mainly due to the synergistic effects of graphene/nitrogen/phosphorus/silicon multi-structures: the graphene sheets enhance the barrier property of carbon layers to prevent heat and volatile transfer; the phosphorus-containing groups as catalyst accelerate and promote the char formation in condensed phase; the Si O Si structures improve the thermal oxidative stability; the nitrogen elements in P G D produce the inert gases at high temperature and play a major role in the gaseous phase.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2020
·
IF 4.939
Siqi Yu,Bing Han,Yunchao Lou,Zhe Liu,Guodong Qian,Zhiyu Wang
In addition to the extended light absorption, the effective spatial charge separation is a crucial factor for highly efficient metal-oxide semiconductor-based photocatalysts . Herein, a rational design of metal-semiconductor-metal nano heterostructure for enhancing photocatalytic performance is proposed. The semiconductor nanoparticles are integrated with two metals in one single nano heterostructure. The disordered layers are induced on the surface of TiO 2 to promote the light absorption capacity . More importantly, the n-n + junction is fabricated at the contact region between crystalline TiO 2 (n-TiO 2 ) and disordered layers (n + -TiO 2 ). Besides, the Schottky diode and Ohmic contact are formed on n-TiO 2 and n + -TiO 2 , respectively. As a result, the existence of multi-junctions leads to the formation of multiple continuous built-in electric fields, thus remarkably accelerating the spatial separation of charge carriers. The resulting nano heterostructure with multi-junctions (Pt–TiO 2 –H–Ag) exhibits remarkably promoted photocatalytic performance. The maximum hydrogen generation rate of Pt–TiO 2 –H–Ag under solar illumination (18001.0 μmol/h/g) is 8.3, 9.3, and 1.5 times superior to that of Pt-loaded P25 (Pt–P25), Pt loaded TiO 2 (Pt–TiO 2 ), and hydrogenated Pt–TiO 2 (Pt–TiO 2 –H), respectively. Moreover, the photocatalytic performance under visible illumination is significantly enhanced by Pt–TiO 2 –H–Ag. Specifically, the H 2 generation rate of Pt–TiO 2 –H–Ag (2382.7 μmol/h/g) is about 15.1, 17.2, and 1.4 times higher than that of Pt–P25, Pt–TiO 2 , and Pt–TiO 2 –H, respectively. The corresponding apparent quantum efficiency of Pt–TiO 2 –H–Ag is 15.8% (420 nm). The nano heterostructure with multi-junctions also exhibits excellent stability after five cycles, remaining hydrogen evolution rates of 15581.5 and 2211.4 μmol/h/g under solar and visible illumination, respectively. This effective and controllable manufacturing strategy could provide new opportunities to simultaneously extend optical absorption and facilitate the spatial charge separation and transport of wide-bandgap metal-oxide semiconductors.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Boyang Yu,Han Xiao,Yilin Zeng,Shiyou Liu,Dirui Wu,Pei Liu,Jinhua Guo,Wenke Xie,Jiangjiang Duan,Jun Zhou
Emerging thermocells have the commercialized potential for directly harvesting low-grade heat. Although a huge progress in p-type thermocells, their n-type counterpart has seriously lagged, becoming a major bottleneck for practical utilization of their integrated devices. Here, we developed a novel Cu-based thermosensitive crystallization and 3D multi-structured electrodes to synergistically boost the thermodynamic and kinetic characteristics of the n-type thermocell. As a result, the optimized Cu/Cu 2+ -based system achieved an exceptionally high value for the Seebeck coefficient (1.66 mV K –1 ) and the power density (3.5 W m –2 ), accompanied with a much competitive cost-performance metric (~$3.28 W –1 ), all of which were superior to the p-type benchmark. Furthermore, a high-performance p-n junction of thermocells was demonstrated with a 14.5 times enhancement of output, paving the way for advancing the integrated devices.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Nano Energy
·
2025
·
IF 17.1
Mengyao Cai,Sijie Zhou,Xiaofeng Wang,Wanjin Hu,Dandan Zhong,Xinjie Wei,Lingling Su,Xuelin Wang,Junyao Gong,Liangjun Xia,Weilin Xu
With the growing demand for wearable electronics, a variety of flexible strain sensors have made booming development. However, achieving good linearity and wide sensing range based on stress distribution controls for flexible strain sensors in an economical manner is still a challenge. Herein, combining mature textile processing methods, three strain sensors based on stress distribution to balance the sensitivity-stretchability contradiction have been fabricated. A porous fiber-based stretchable strain sensor with a unique conductive pathway consisting of a three-dimensional (3D) fiber skeleton of Juncus effusus (JE) and Ketjen black (KB) particles embedded on the surface was presented. The obtained JE-based strain sensor exhibits advanced characteristics of good sensitivity (GF = 7.09) and durability (> 2000 cycles). Secondly, two novel strain sensors were prepared by mature textile methods to extend their sensing range (> 180 %). All three sensors have been demonstrated to have favorable linearity and stability, making them selectable based on specific application requirements. Furthermore, the developed JE-based sensors demonstrate strong potential for energy harvesting, capable of generating an average voltage of 65.5 V and a power output of 82.3 μW. Such the prepared sensors with favorable linearity and a wide sensing range based on stress distribution controls demonstrate potential applications for hand motion monitoring and energy harvesting in wearable electronics.
研究领域:
材料科学
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电子工程
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生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Wenjin Li,Wanting Zhao,Qizhen Luo,Wenzhe Xiao,Xiaoning Wang,Yuting Shi,Jian Sun
High photogenerated carrier recombination inhibits the widespread application of graphite-phase carbon nitride (g-C 3 N 4 ). Construction of junctions is an effective strategy but still under challenges, such as tedious procedure and limited efficiency. Herein, WO x /1D g-C 3 N 4 /2D g-C 3 N 4 multi-junction with enhanced separation of photogenerated carriers was one-pot integrated through in-situ “PTA-Mel” ionic microenvironment by mixing phosphotungstic acid (PTA) and melamine (Mel). Protonated Mel by PTA contributed to the formation of 1D g-C 3 N 4 and the decomposition of [P(W 3 O 40 ) 4 ] 3- produced WO x . 1D g-C 3 N 4 and WO x with oxygen-vacancy deficient provided channels and caves for photoelectrons transfer, respectively. Compared with pure g-C 3 N 4 , the degradation rate constants of Rh B and tetracycline hydrochloride (TC) by WO x /1D g-C 3 N 4 /2D g-C 3 N 4 are 2.34 and 1.45 times high respectively due to the excellent visible light absorption and improved photogenerated carrier separation. This method could be extended to the design of multiple heterojunctions in one photocatalyst through a facile process.
研究领域:
材料科学
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环境科学
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化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Njemuwa Nwaji,Eser Metin Akinoglu,Biyun Lin,Xin Wang,Michael Giersig
Chains of alternating semiconductor nanocrystals are complex nanostructures that can offer control over photogenerated charge carriers dynamics and quantized electronic states. We develop a simple one-pot colloidal synthesis of complex Cu1.94S-CdS and Cu1.94S-ZnS nanochains exploiting an equilibrium driving ion exchange mechanism. The chain length of the heterostructures can be tuned using a concentration dependent cation exchange mechanism controlled by the precursor concentrations, which enables the synthesis of monodisperse and uniform Cu1.94S-CdS-Cu1.94S nanochains featuring three epitaxial junctions. These seamless junctions enable efficient separation of photogenerated charge carriers, which can be harvested for photocatalytic applications. We demonstrate the superior photocatalytic activity of these noble metal free materials through solar hydrogen generation at a hydrogen evolution rate of 22.01 mmol g–1 h–1, which is 1.5-fold that of Pt/CdS heterostructure photocatalyst particles.
研究领域:
材料科学
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纳米技术
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光催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
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2018
·
IF 6.042
Kangming Xiong,Fangjun Huo,Jianbin Chao,Yongbin Zhang,Caixia Yin
Although some progress has been made in distinguishing the detection of biothiols, NIR biothiol fluorescent probes for simultaneously distinguishing detection of Cys, Hcy, and GSH in vivo have not been reported. The design of these probes involves the introduction of NIR fluorophores and multiple binding sites; thus, the integrated design of probes remains a challenge. Although Cys, Hcy, and GSH have common functional groups, a sulfydryl group and an amino group, due to their differences in spatial structure, they may react with multiple binding site probes to produce different reaction products in different bonding mechanisms, resulting in different colors and fluorescent signal changes of the system. Therefore, multiple binding site fluorescent probes can realize their discrimination detection. For an NIR fluorescent probe, it is easier to realize in vivo imaging to promote the research of biothiols in clinical diagnosis. In our work, not only were multiple binding sites constructed in the compound but also NIR fluorophores were introduced. This enables the probe to not only efficiently distinguish detection of Cys/Hcy and GSH but also achieve fluorescence imaging in vivo. We believe this result is a milestone in the discrimination detection of biothiols.
研究领域:
生物化学
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医学诊断
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分子探针研究
✓ 已验证
DOI
PubMed
高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 12
·7355-7370
·
IF 3.917
Dong Yahao,Bi Jiajun,Zhu Dajian,Meng Di,Ming Shujun,Guo Wen,Chen Zhen,Liu Qian,Guo Lei,Li Tao
Due to their eco-friendly nature, polysaccharides are desirable supporting materials in organic transformations. Nevertheless, as is the case for other supports, polysaccharides have to face the issue of seeking more binding sites via multifunctional structures to capture metal species in the catalyst, which enhance stability and promote catalytic performance in aforementioned process. In this paper, an environmentally-friendly and multifunctional cellulose supported Pd(II)-Schiff base complex is fabricated and applied in the formation of different biaryls under mild ambient conditions. The results of thermal analysis reveal that the composite has high thermal stability. The as-prepared catalyst demonstrates to be a robust and efficient catalyst with more than 90% yields in H 2 O: EtOH (1:1) at 70 °C by using 0.30 mol% of catalyst under air towards the coupling of various substituted aryl halides and phenylboronic acids. Moreover, identified by ICP-OES analysis, the green Pd(II) catalyst displays higher metal content (1.93%) in comparison with the direct deposition of Pd particles on cellulose (0.93%), and prevents the metal leaching (< 1%) via the coordination interaction of multiple capturing sites (–OH, Schiff base and pyridyl moieties) with palladium. The resultant catalyst is characterized by FT-IR, TGA, XRD, SEM, TEM, XPS, CP/MAS 13 C-NMR, and ICP-OES examination. Also, this green catalyst is able to be retrieved in five cycles with simple centrifugation. Notably, we propose a plausible multifunctional catalyst complex. The present study offers a novel and effective supported catalyst, which broadens the contributions of polysaccharides in green catalysis. Graphic abstract
研究领域:
高分子化学
·
绿色化学
·
有机催化
·
材料化学
·
环境友好材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Yu Tian,Zhijie Zhu,Qing Li,Jing Zhang,Cai-Feng Wang,Guan Wu,Shen Shen Li,Ji Jun Xiao,Su Chen
Methods that allow the self-assembly of colloidal nano/micro-particles into controllable structures are highly important in many applications, such as photonics, biosensors and electronic chemicals. However, the complicated procedures, low assembly efficiency and multiscale integration of self-assembly of colloidal particles have become great challenges. Here, we first develop a hydrophobic-force-induced self-assembly (HFSA) method to fabricate homogeneous and binary colloidal microdroplets by the feed of volatile fluorocarbon oil. Specially, both mono-color and dual-color colloidal photonic crystals (CPCs) can be architected via HFSA in an efficient (within 200 s), coffee-ring free and visualized fashion. Additionally, such effective HFSA process is further confirmed by dissipative particle dynamics (DPD) simulations. Moreover, a variety of multi-structural colored CPCs are available by using hydrophobic reagents, combining with the visualized HFSA process. This work presents an easy-to-perform platform for designing orderly structural materials, which will significantly highlight the development of colloidal assembly methodology.
研究领域:
材料科学
·
光子学
·
胶体化学
·
自组装技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Zhongyu Shi,Xiasen Wei,Yunfan Wei,Zheyi Zhang,Sibao Wan,Haiyan Gao,Zhen Qin
A novel glycoside hydrolase (GH) family 16 multi-domain β-1,3-1,4-glucanase (FsGlc16A) from Fibrobacter sp. UWP2 was identified, heterogeneously expressed, and its enzymatic properties, protein structure and application potential were characterized. Enzymological characterization showed that FsGlc16A performed the optimal catalytic activity at pH 4.5 and 50 °C with a specific activity of 3263 U/mg. FsGlc16A exhibited the substrate specificity towards oat β-glucan, barley β-glucan and lichenan, and in addition, it hydrolyzed oat β-glucan and lichenan into different β-glucooligosaccharides with polymerization degrees of 3–4, which further illustrated that it belonged to the endo-type β-1,3-1,4-glucanase. FsGlc16A was classified in subfamily25 of GH16. A ‘PXSSSS’ repeats domain was identified at the C-terminus of FsGlc16A, which was distinct from the typical GH family 16 β-1,3-1,4-glucanases. Removing the ‘PXSSSS’ repeats domain affected the binding of the substrate to FsGlc16A and reduced the enzyme activity. FsGlc16A displayed good potential for the applications, which hydrolyzed oat bran into β-glucooligosaccharides, and reduced filtration time (18.89 %) and viscosity (3.64 %) in the saccharification process. This study investigated the enzymatic properties and domain function of FsGlc16A, providing new ideas and insights into the study of β-1,3-1,4-glucanase.
研究领域:
生物化学
·
酶学
·
微生物学
·
食品科学
✓ 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）