RARE METALS
·
2021
·Vol. 41
·期 2
·385-395
·
IF 4.003
Feng Ya-Jie,Wang Yang,Wang Kai-Wen,Ma Jiang-Ping,Duan You-Yu,Liu Jie,Lu Xu,Zhang Bin,Wang Guo-Yu,Zhou Xiao-Yuan
Hydrogen, with the merits of zero emissions and high energy density, is one of the promising green energy sources. Seeking for high efficiency and low-cost catalysts is one of the key issues for hydrogen evolution and its practical applications. Nano-structured metal co-catalysts are widely used to improve the photocatalytic performance via surface electronic structure/properties optimization of the catalyst. Herein, we report ultra-fine (~ 1 nm) Cu clusters decorated hydrangea-like TiO 2 systems for photocatalytic hydrogen evolution. The pristine hydrangea-like TiO 2 support shows a promising performance of hydrogen evolution (1.8 mmol·h −1 ·g −1 ), which is ~ 10.7 times higher than that of the commercial P25 (168 μmol·h −1 ·g −1 ). After ultra-fine Cu clusters decoration, a maximal hydrogen evolution performance (3.7 mmol·h −1 ·g −1 ) is achieved in the optimized system 6Cu–TiO 2 (6 wt%). Experimental and theoretical studies demonstrate that the ultra-fine Cu clusters decoration could promote the charge separation and transfer process effectively. The Cu clusters also act as reaction sites for reduction of H 2 O to H 2 . These results are of great importance for the study of Cu-based co-catalyst systems and also shed light on the development of other non-noble metal co-catalysts in photocatalysis hydrogen evolution. Graphical abstract
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 11
·7327-7339
·
IF 5.044
Xu Yongjian,Shi Yun,Chen Xuyong,Liu Fenfen,Zhao Wei
As the living standard improves, disposable sanitary and household paper requires not only softness or easy to fluff in a dry state, but also good antibacterial property. In this study, a series of alkyl quaternary ammonium salts ( AQAS ), a kinds of antibacterial-debonding agents, were synthesized by using a two-step process. The SN2 nucleophilic substitution reaction was designed between triethanolamine and sulfoxide chloride, and followed subsequent quaternization by tertiaryamines with different long alkyl chains. The obtained products can be used as an antibacterial and softening/debonding agent for improving the performance of paper or fluff pulp. The results showed that these new compounds can endow antibacterial function and high softness to paper or control appropriate burst strength to fluff pulp. These AQAS products can be not only used in daily disposable sanitary products, but also have potential applications in other products such as glass spacer paper, advanced household paper, or antibacterial tissue products to prevent microbial contamination.
✓ 已验证
产品关联
DOI
高影响因子
Advanced Fiber Materials
·
2021
·Vol. 3
·期 4
·239-250
·
IF 0
Xue Lili,Fan Wei,Yu Yang,Dong Kai,Liu Chengkun,Sun Yanli,Zhang Cong,Chen Weichun,Lei Ruixin,Rong Kai,Wang Qi
Wearable and portable electronic devices based on textile structure have been widely used owing to their wearability and comfortableness. However, yarn fineness and the comfort of the fabric cannot satisfy the requirements of smart wearable devices. This work presents a novel strategy to prepare highly integrated PVDF/conductive nylon core-sheath structure piezoelectric yarns for wearable which is fabricated by combining electrospinning strategy with 2D braiding technology. The fineness of single yarns as well as strength are both improved significantly compared to previous works. The piezoelectric outputs of the yarn are still stable after 800 s fatigue test at a frequency of 4 Hz, and the cycle stability can maintain more than 3200 cycles. Furthermore, the piezoelectric yarns are further woven into piezoelectric plain fabric. According to the electrical performance, the length of the piezoelectric yarn and the thickness of the piezoelectric layer would both affect the output electrical performance. The yarn of the 10 cm in length and 600 μm in fineness can produce an output voltage of 120 mV. Meanwhile, Both the piezoelectric yarn and the fabric could generate piezoelectric output signals through human movement, such as bending, walking. Therefore, the electrical and mechanical performance of the piezoelectric yarns prepared in our work could be improved significantly, and the comfortableness and durability performance of the piezoelectric fabric can satisfy most wearing requirements, which would provide some help in the field of piezoelectric wearable devices based on yarns and fabrics. Graphical Abstract
✓ 已验证
产品关联
DOI
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 7
·1-13
·
IF 3.097
Yao Qi,Lan Hai,Li Xin,Chen Youyi
Organic–inorganic interpenetrating network poly (acrylic acid- co -acrylamide) IPN-P(AA-co-AM) polymer sphere with core–shell structure has been synthesized by modified suspension polymerization, which the core is high cross-linked and shell is light cross-linked, respectively. The dispersed phase (water phase) and continuous phase (oil phase), as well as core and shell crosslinking agent are screened based on the water absorption capacity of the polymer spheres. In addition, SiO 2 is applied to endow polymer spheres with excellent thermal and water absorption properties. FTIR, TG, SEM, and XPS analyze the chemical structure, thermal properties, morphology and surface element of polymer spheres, respectively. Particularly, the forming mechanism of polymer spheres and water absorption dynamic model are discussed in detail. The results show that the Organic–inorganic IPN-P(AA-co-AM) polymer spheres are successfully synthesized. The polymer spheres could be wrapped effectively when the SiO 2 content up to 2%. Compared to polymer spheres without SiO 2 , the thermal stability is greatly improved. The optimum core and shell crosslinking agent are pentaerythritol triacrylate (PETA) and sodium alginate, respectively. The maximum absorption capacity of polymer spheres for distilled water and 0.9wt% sodium chloride can up to 922.22 g/g and 93.87 g/g, respectively. Finally, the water absorption of IPN-P(AA-co-AM) polymer spheres dynamic model is closed to second-order.
✓ 已验证
产品关联
DOI
高影响因子
Nanoscale Research Letters
·
2021
·Vol. 16
·期 1
·1-13
·
IF 4.703
An Li,Tao Qing,Wu Yue,Wang Nana,Liu Yan,Wang Feifei,Zhang Lixing,Shi Aihua,Zhou Xiumin,Yu Shuang,Zhang Jingzhong
Parkinson's disease (PD) is characterized by the progressive loss of dopaminergic neurons in the midbrain, and the stem cell transplantation method provides a promising strategy for the treatment. In these studies, tracking the biological behaviors of the transplanted cells in vivo is essential for a basic understanding of stem cell function and evaluation of clinical effectiveness. In the present study, we developed a novel ultrasmall superparamagnetic iron oxide nanoparticles coating with the polyacrylic acid (PAA) and methoxypolyethylene glycol amine (PEG) by thermal decomposition method and a two-step modification. The USPIO-PAA/PEG NPs have a uniform diameter of 10.07 ± 0.55 nm and proper absorption peak of the corresponding ligands, as showed by TEM and FTIR. MTT showed that the survival of cells incubated with USPIO-PAA/PEG NPs remained above 96%. The synthesized USPIO-PAA/PEG had a good relaxation rate of 84.65 s −1 Mm −1 , indicating that they could be efficiently uptake and traced by MRI. Furthermore, the primary human adipose-derived stem cells (HADSCs) were characterized, labeled with USPIO-PAA/PEG and transplanted into the striatum of 6-hydroxydopamine (6-OHDA)-induced PD rat models. The labeled cells could be traced by MRI for up to 3 weeks after the transplantation surgery; moreover, transplantation with the labeled HADSCs significantly attenuated apomorphine-induced rotations in PD models and increased the number of the dopaminergic neurons in the substania nigra . Overall, the development of USPIO-PAA/PEG NPs provides a promising tool for in vivo tracing technique of cell therapy and identifies a novel strategy to track stem cells with therapeutic potential in PD.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Advanced Ceramics
·
2021
·Vol. 10
·期 6
·1291-1298
·
IF 6.707
Huang Jiaxuan,Wan Hujie,Li Mian,Zhang Yiming,Zhu Jianfeng,Li Xuelin,Shui Wenchao,Li Yao,Fan Xiaomeng,Wen Qiye,Xiao Xu,Huang Qing
Electromagnetic interference (EMI) shielding materials have received considerable attention in recent years. The EMI shielding effectiveness (SE) of materials depends on not only their composition but also their microstructures. Among various microstructure prototypes, porous structures provide the advantages of low density and high terahertz wave absorption. In this study, by using carbonised wood (CW) as a template, 1-mm-thick MAX@CW composites (Ti 2 AlC@CW, V 2 AlC@CW, and Cr 2 AlC@CW) with a porous structure were fabricated through the molten salt method. The MAX@CW composites led to the formation of a conductive network and multilayer interface, which resulted in improved EMI SE. The average EMI SE values of the three MAX@CW composites were > 45 dB in the frequency of 0.6–1.6 THz. Among the composites, V 2 AlC@CW exhibited the highest average EMI SE of 55 dB.
✓ 已验证
产品关联
DOI
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-15
·
IF 14.919
Qin Xing,Wu Chu,Niu Dechao,Qin Limei,Wang Xia,Wang Qigang,Li Yongsheng
Peroxisome, a special cytoplasmic organelle, possesses one or more kinds of oxidases for hydrogen peroxide (H 2 O 2 ) production and catalase for H 2 O 2 degradation, which serves as an intracellular H 2 O 2 regulator to degrade toxic peroxides to water. Inspired by this biochemical pathway, we demonstrate the reactive oxygen species (ROS) induced tumor therapy by integrating lactate oxidase (LOx) and catalase (CAT) into Fe 3 O 4 nanoparticle/indocyanine green (ICG) co-loaded hybrid nanogels (designated as FIGs-LC). Based on the O 2 redistribution and H 2 O 2 activation by cascading LOx and CAT catalytic metabolic regulation, hydroxyl radical (·OH) and singlet oxygen ( 1 O 2 ) production can be modulated for glutathione (GSH)-activated chemodynamic therapy (CDT) and NIR-triggered photodynamic therapy (PDT), by manipulating the ratio of LOx and CAT to catalyze endogenous lactate to produce H 2 O 2 and further cascade decomposing H 2 O 2 into O 2 . The regulation reactions of FIGs-LC significantly elevate the intracellular ROS level and cause fatal damage to cancer cells inducing the effective inhibition of tumor growth. Such enzyme complex loaded hybrid nanogel present potential for biomedical ROS regulation, especially for the tumors with different redox state, size, and subcutaneous depth.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIBERS AND POLYMERS
·
2021
·Vol. 23
·期 2
·386-395
·
IF 2.153
Xu Qingbo,Wang Peng,Zhang Yanyan,Li Changlong
k]Immobilizing inorganic particles such as zinc oxide (ZnO), titanium dioxide (TiO 2 ), silver nanoparticles (Ag NPs) or grafting special biopolymer such as chitosan on cotton fabrics is the main method to prepare antibacterial and ultraviolet (UV) protective cotton fabrics. However, poor durability and complex finishing methods are still of the main defects of antibacterial and UV protective fabric samples. In the present work, the Ag/TiO 2 colloid solution was prepared with using the carboxymethyl chitosan (CMC) as a stabilizer, then the CMC and Ag/TiO 2 composite nanoparticles were coated on the fabric via finishing technology of pad-dry-cure. As a result, the modified fabric showed excellent antibacterial and UV protective properties, with the values of bacterial reduction (BR) and ultraviolet protection factor were reached at 99.5 % and 79.0, respectively. Moreover, even after 50 washing cycles, these properties of the finished fabrics were not obviously reduced. These results demonstrated that the finished fabric sample has durable antibacterial and UV protective properties which could has a great potential application in the field of medical and outdoor apparel.
✓ 已验证
产品关联
DOI
高影响因子
Scientific Reports
·
2021
·Vol. 11
·期 1
·1-15
·
IF 4.38
Lin Lina,Zhu Wenju,Zhang Cong,Hossain Md. Yousuf,Oli Zubair Bin Sayed,Pervez Md. Nahid,Sarker Shamima,Hoque Md. Ikram Ul,Cai Yingjie,Naddeo Vincenzo
The conventional dyeing process requires a substantial amount of auxiliaries and water, which leaches hazardous colored effluents to the environment. Herein, a newly developed sustainable spray dyeing system has been proposed for cotton fabric in the presence of reactive dyes, which has the potential to minimize the textile dyeing industries environmental impact in terms of water consumption and save significant energy. The results suggest that fresh dye solution can be mixed with an alkali solution before spray dyeing to avoid the reactive dye hydrolysis phenomenon. After that, drying at 60–100 °C, wet fixation treating for 1–6 min, and combined treatments (wet fixation + drying) were sequentially investigated and then dye fixation percentages were around 63–65%, 52–70%, and above 80%, respectively. Following this, fixation conditions were optimized using L 16 orthogonal designs, including wet fixation time, temperature, dye concentration, and pH with four levels where the “larger-the-better” function was selected to maximize the dye fixation rate. Additionally, the color uniformity and wash and rubbing fastnesses were at an acceptable level when both treatments were applied. Finally, the dyes were hydrolyzed after wet fixation, and the hydrolysis percentages were enhanced after the drying process.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2021
·Vol. 30
·期 2
·653-665
·
IF 3.667
Zheng Wenting,Kuchukulla Ratnakar Reddy,Xu Xiangning,Zhang Dandan,Zhou Lihong,Zeng Qingle
How to efficiently and economically remove heavy metals from sewage has been a huge challenge in the world. This article reports on an adsorbing material with comb-shaped chitosan–grafted polyethyleneimine dithiocarbamate (CC-GP-D), which is prepared by grafting polyethyleneimine on chitosan as main chain via glutaraldehyde, then reduce the generated C=N double bond using NaBH 4 , and finally functionalizing primary and secondary amino groups with CS 2 . This comb-shaped structure adsorbent material can better contact with heavy metal ions, so that it can absorb more heavy metal ions at a faster rate. This material is more green, environmentally friendly and economical with chitosan as the main chain. The material can effectively adsorb heavy metals in sewage, such as cadmium (II), copper (II), lead (II), nickel (II), and cobalt (II). After 80 min of adsorption, its adsorption capacity for cadmium (II), copper (II), lead (II), nickel (II), and cobalt (II) reached 178.7 mg/g, 138.9 mg/g, 337.7 mg/g, 109.2 mg/g, 157.6 mg/g respectively.
✓ 已验证
DOI
高影响因子
Nano Research
·
2021
·Vol. 15
·期 2
·1269-1275
·
IF 8.897
Che Zhiwen,Lu Xuyun,Cai Bingfeng,Xu Xiangxing,Bao Jianchun,Liu Ying
Ultra-small size metal nanoparticles (u-MNPs) have broad applications in the fields of catalysis, biomedicine and energy conversion. Herein, by means of a ligand-controlled synthesis strategy, series of Ru-based NPs with high dispersity and ultra-small size (marked as u-Ru/C), or sparse and aggregated state (marked as a-Ru/C) anchored on the surface of hollow porous carbon shells are prepared. Systematical in-situ thermogravimetry-mass spectrometry-Fourier transform infrared spectra tests suggest that the different ligands in these Ru-based precursors can regulate the nucleation, growth and fixation of metal sites during the pyrolysis process, thus contributing to Ru NPs with various size and dispersity. As a result, when applied to hydrogen evolution reaction, the u-Ru-1/C catalyst displays a low Tafel slope of 26 mV·dec −1 , overpotential of 31 mV (at 10 mA·cm −2 ) and a large exchange current density of 1.7 mA·cm −2 in 1.0 M KOH, significantly better than that of the a-Ru-2/C, hollow carbon and even commercial 20% Pt/C. This is mainly because that the u-Ru-1/C sample owns both smaller particle size, more electrochemical active sites, higher intrinsic activity and optimized surface H adsorption ability than that of the a-Ru-2/C counterpart. Such ligand-modulated growth strategy is not only applicable to Ru, but also can be extended to other similar metals, offering a step forward in the design and synthesis of highly dispersed u-MNPs.
✓ 已验证
产品关联
DOI
高影响因子
Biotechnology for Biofuels
·
2021
·Vol. 14
·期 1
·1-13
·
IF 6.04
Zhao Yu,Liu Shiqi,Lu Zhihui,Zhao Baixiang,Wang Shuhui,Zhang Cuiying,Xiao Dongguang,Foo Jee Loon,Yu Aiqun
Background In biological cells, promoters drive gene expression by specific binding of RNA polymerase. They determine the starting position, timing and level of gene expression. Therefore, rational fine-tuning of promoters to regulate the expression levels of target genes for optimizing biosynthetic pathways in metabolic engineering has recently become an active area of research.Results In this study, we systematically detected and characterized the common promoter elements in the unconventional yeast Yarrowia lipolytica, and constructed an artificial hybrid promoter library that covers a wide range of promoter strength. The results indicate that the hybrid promoter strength can be fine-tuned by promoter elements, namely, upstream activation sequences (UAS), TATA box and core promoter. Notably, the UASs of Saccharomyces cerevisiae promoters were reported for the first time to be functionally transferred to Y. lipolytica. Subsequently, using the production of a versatile platform chemical isoamyl alcohol as a test study, the hybrid promoter library was applied to optimize the biosynthesis pathway expression in Y. lipolytica. By expressing the key pathway gene, ScARO10, with the promoter library, 1.1–30.3 folds increase in the isoamyl alcohol titer over that of the control strain Y. lipolytica Po1g KU70∆ was achieved. Interestingly, the highest titer increase was attained with a weak promoter PUAS1B4-EXPm to express ScARO10. These results suggest that our hybrid promoter library can be a powerful toolkit for identifying optimum promoters for expressing metabolic pathways in Y. lipolytica.Conclusion We envision that this promoter engineering strategy and the rationally engineered promoters constructed in this study could also be extended to other non-model fungi for strain improvement.
✓ 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）