International Journal of Minerals Metallurgy and Materials
·
2021
·Vol. 28
·期 11
·1868-1874
·
IF 2.232
Xiong Shan-xia,Kuang Jian-lei,Zheng Qian-fang,Xiao Ting,Liu Wen-xiu,Wang Qi,Jiang Peng,Cao Wen-bin
Wood-based panels containing urea-formaldehyde resin result in the long-term release of formaldehyde and threaten human health. In this study, inorganic aluminosilicate coatings prepared by combining metakaolin, silica fume, NaOH, and H 2 O were applied to the surfaces of wood-based panels to obstruct formaldehyde release. The Si/Al, Na/Al, and H 2 O/Na 2 O molar ratios of the coatings were regulated to investigate their effects on the structure and formaldehyde-resistant barrier properties of coatings. Results showed that the cracks in the coatings gradually disappeared and the formaldehyde resistance rates of the barrier increased as the Si/Al molar ratio was increased from 1.6 to 2.2. This value also increased as the Na/Al molar ratio was increased from 0.9 to 1.2 because of the improvement of the degree of polymerization. As the H 2 O/Na 2 O molar ratio was increased from 12 to 15, the thickness of the dry film decreased gradually and led to the reduction in the formaldehyde resistance rate. When the Si/Al, Na/Al, and H 2 O/Na 2 O molar ratios were 2.2, 1.2, and 12, respectively, the inorganic aluminosilicate coating showed good performance as a formaldehyde-resistant barrier and its formaldehyde resistance rate could reach up to 83.2%.
✓ 已验证
产品关联
DOI
高影响因子
Science China-Materials
·
2021
·Vol. 65
·期 1
·95-104
·
IF 8.273
Bao Kepan,Pang Yuepeng,Yang Junhe,Sun Dalin,Fang Fang,Zheng Shiyou
Rational composite design is highly important for the development of high-performance composite polymer electrolytes (CPEs) for solid-state lithium (Li) metal batteries. In this work, Li closo-borohydride, Li 2 B 12 H 12 , is introduced to poly(vinylidene fluoride)-Li-bis-(trifluoromethanesulfonyl) imide (PVDF-LiTFSI) with a bound N -methyl pyrrolidone plasticizer to form a novel CPE. This CPE shows superb Li + conduction properties, as evidenced by its conductivity of 1.43 × 10 −4 S cm −1 and Li + transference number of 0.34 at 25°C. Density functional theory calculations reveal that Li 2 B 12 H 12 , which features electron-deficient multicenter bonds, can facilitate the dissociation of LiTFSI and enhance the immobilization of TFSI to improve the Li + conduction properties of the CPE. Moreover, the fabricated CPE exhibits excellent electrochemical, thermal, and mechanical stability. The addition of Li 2 B 12 H 12 can help form a protective layer at the anode/electrolyte interface, thereby preventing unwanted reactions. The above benefits of the fabricated CPE contribute to the high compatibility of the electrode. Symmetric Li cells can be stably cycled at 0.2 mA cm −2 for over 1200 h, and Li∥LiFePO 4 cells can deliver a reversible specific capacity of 140 mA h g −1 after 200 cycles at 1 C at 25°C with a capacity retention of 98%.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOBIOTECHNOLOGY
·
2021
·Vol. 19
·期 1
·1-19
·
IF 10.435
Deng Xingyu,Chen Xiabin,Geng Fang,Tang Xin,Li Zhenzhen,Zhang Jie,Wang Yikai,Wang Fangqian,Zheng Na,Wang Peng,Yu Xiaohua,Hou Shurong,Zhang Wei
Background The poor regenerative capability and structural complexity make the reconstruction of meniscus particularly challenging in clinic. 3D printing of polymer scaffolds holds the promise of precisely constructing complex tissue architecture, however the resultant scaffolds usually lack of sufficient bioactivity to effectively generate new tissue.Results Herein, 3D printing-based strategy via the cryo-printing technology was employed to fabricate customized polyurethane (PU) porous scaffolds that mimic native meniscus. In order to enhance scaffold bioactivity for human mesenchymal stem cells (hMSCs) culture, scaffold surface modification through the physical absorption of collagen I and fibronectin (FN) were investigated by cell live/dead staining and cell viability assays. The results indicated that coating with fibronectin outperformed coating with collagen I in promoting multiple-aspect stem cell functions, and fibronectin favors long-term culture required for chondrogenesis on scaffolds. In situ chondrogenic differentiation of hMSCs resulted in a time-dependent upregulation of SOX9 and extracellular matrix (ECM) assessed by qRT-PCR analysis, and enhanced deposition of collagen II and aggrecan confirmed by immunostaining and western blot analysis. Gene expression data also revealed 3D porous scaffolds coupled with surface functionalization greatly facilitated chondrogenesis of hMSCs. In addition, the subcutaneous implantation of 3D porous PU scaffolds on SD rats did not induce local inflammation and integrated well with surrounding tissues, suggesting good in vivo biocompatibility.Conclusion sOverall, this study presents an approach to fabricate biocompatible meniscus constructs that not only recapitulate the architecture and mechanical property of native meniscus, but also have desired bioactivity for hMSCs culture and cartilage regeneration. The generated 3D meniscus-mimicking scaffolds incorporated with hMSCs offer great promise in tissue engineering strategies for meniscus regeneration.Graphical Abstract
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Analytical Methods
·
2021
·Vol. 15
·期 4
·993-1000
·
IF 3.366
Yu Lili,Jiang Chenrui,Xi Liping,Zhang Xiaoni,Tong Jinzhe,Chen Zhuo,Chen Rong,He Hua
In this paper, a simple and effective strategy was designed for colorimetric sensing of benzoyl peroxide (BPO) based on the morphological transition of silver nanoprisms (AgNPRs). The decomposition of O–O bond of BPO generated strong oxidant benzoyl oxide free radical, which could be first oxidized the silver atoms at the corner areas and the {110} facet of AgNPRs. With the increase of the BPO concentration, AgNPRs were oxidized to produce nanodisks and a blue shift of the in-plane dipole plasmon resonance peak could be observed. In addition, a distinct color change of AgNPRs solution from blue to purple, fuchsia, and finally colorless appeared with 10 min, which could be easily observed by naked eyes. Under the optimal conditions, a linear relationship between the blue shift of the in-plane dipole plasmon resonance peak and BPO concentration ranged from 2 to 80 μM with the detection limit of 0.47 μM. The practical applicability of this assay was verified by successfully determining BPO in flour samples with a good recovery, which demonstrated its great potentials in food safety field. Furthermore, a simple, inexpensive, and portable test kit for the visual detection of BPO in flour samples was also designed by utilizing agarose hydrogel as a visual detection platform. Thus, the proposed sensor provided a promising prospective candidate for the rapid detection and surveillance of BPO.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2021
·Vol. 331
·期 1
·365-373
·
IF 1.371
Li Chunhui,He Hui,He Mingjian,Gao Yang,Zhang Meng,Jiao Caishan
A detailed extraction equilibrium study is experimentally performed to understand the extraction mechanisms of Ce(IV) by 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (C 4 mimNTf 2 ) in 1,2-dichloroethane. Further, the influence of adding TBP on the distribution ratio is investigated and demonstrated. The ceric aqueous chemistry in the nitric acid solution and slope analysis are combined to reveal the extraction mechanism. The monovalent anionic complex HCe(NO 3 ) 6 − is the dominant species, which extracted by C 4 mimNTf 2 . Importantly, this study demonstrates the antagonistic effect between TBP and C 4 mimNTf 2 on the extraction process.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 24
·28891-28908
·
IF 2.478
Liu Guangdi,Cui Xiuxiu,Yao Lijia,Zhao Rongjun,Tian Xu,Li Diquan,Sun Chunyan,Wang Yude
This paper reports the synthesis of ZnO-SnO 2 nanocomposites modified by PdO nanoparticles named PdO-ZSO which are prepared by the one-step hydrothermal method at 160 °C for 12 h and gas sensing test to H 2 and C 4 H 10 inflammable gas. Meanwhile, PdO-ZSO nanoparticles are XRD, SEM, TEM, EDS, XPS and other characterization methods to further explain its morphological formation process. As the sensing materials, PdO-ZSO exhibits extraordinary gas sensing behaviors for hydrogen (H 2 ) and butane (C 4 H 10 ) and the response reaches 98 and 58 to H 2 and C 4 H 10 at operating temperature of 370 °C, respectively. And the response time and recovery time are both less than 2 s and 4 s respectively, with good repeatability and outstanding long-term stability. The existence of PdO is able to increase the resistance modulation range of heterostructure. And the enhanced gas sensing performances can be ascribed to the catalysis of noble metal doping and the formation of ternary heterostructure between PdO and ZnO-SnO 2 nanocomposites.
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2021
·Vol. 28
·期 1
·139-149
·
IF 2.817
Zhang Xiaole,Li Song,Wang Shenghe,Liu Kun,Zhang Zining,Wen Zhongsheng,Ji Shijun,Sun Juncai
Abstract The main obstacles to the development of manganese-based oxide anode materials for lithium-ion batteries (LIBs) are inherently low conductivity and sluggish electrochemical kinetics. In this work, we propose a strategy of introducing oxygen vacancies (Vö) on the surface of nanostructure at room temperature and atmospheric pressure to improve the electrochemical performance of anode materials. Porous MnO 2 spheroids with 11.2% Vö are fabricated by a ball milling method using commercial electrolytic MnO 2 . The as-synthesized MnO 2 is composed of 20–30 nm nanoparticles. The optimized MnO 2 shows an excellent rate capability of 350 mAh g −1 at 6.4 A g −1 and high specific capacity of 1200 mAh g −1 after 650 cycles under 2 A g −1 . The boosted electrochemical performance is attributed to the porous hierarchical structure and the appropriate Vö concentration involved in the MnO 2 . In addition, the enhanced Li + diffusion coefficient is demonstrated through the kinetics analysis. The approach provides a facile route via tunable Vö concentration for improving the electrochemical performance of manganese-based oxide anode materials for LIBs. Highlight • The porous MnO 2 spheroids with tunable Vö concentrate were synthesized by a ball milling method. • The MnO 2 spheroids are composed of 20-30 nm nanoparticles. • The MnO 2 spheroids exhibit an excellent rate performance and cycling stability. • The ball mill is facile, environmentally friendly, economical for the mass industrial scale.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POROUS MATERIALS
·
2021
·Vol. 29
·期 1
·241-247
·
IF 2.496
Lu Jun,Cui Chaofan,Yu Qihao,Su Juanjuan,Han Jian
Oily wastewater is an urgent issue that threatens the ecosystem and human health. Superhydrophobic porous materials are widely concerned as promising candidates for effective oil/water separation and oil adsorption. However, superhydrophobic porous materials are still confronted with frustrations such as complex preparation processes and secondary pollution to the environment. Superhydrophobic porous materials with biodegradability and a relatively simple preparation process are more attractive to practical application and environmental protection. In this work, biodegradable and industrially applied polylactic acid (PLA) nonwoven materials were used as porous membranes, then PLA nanoparticles were loaded on the membrane surface to construct the hierarchical rough structure. The modified PLA nonwoven membrane (nano-PLA) shows superhydrophobicity and efficient oil/water separation performance. Moreover, strong mechanical strength and acceptable toughness are obtained. This work offers an easily controlled and industrially used pathway for the design of robust, highly selective, and biodegradable oil/water separation materials.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 23
·27871-27881
·
IF 2.478
Zhang Hongda,Zhou Hong,Liu Guolong,Ge Jing,Jin Liguo
The hybrid fillers (Al 2 O 3 –ATP hybrids) composed of two types of inorganic materials—modified alumina (Al 2 O 3 ) and modified attapulgite (ATP)—were principally prepared, following which the epoxy matrix (EP) composites reinforced with Al 2 O 3 –ATP hybrids were synthesized. The mechanical and dynamic mechanical properties of fabricated Al 2 O 3 –ATP/EP composites are enhanced by doping Al 2 O 3 –ATP hybrids into EP. The highest impact and flexural strength of EP composites (3 wt% Al 2 O 3 –3 wt% ATP/EP) are improved to 27.88 kJ/m 2 and 157.04 MPa, which are 457.6% and 89.2% higher than those of the pure epoxy resin, respectively. The glass transition temperature of Al 2 O 3 –ATP/EP composites increases by 8.8 °C, compared with pure EP composites and the dielectric constant and dielectric loss can reach 3.19 and 0.0041 at 100 Hz. These excellent mechanical and dynamic mechanical properties, accompanied by dielectric property may expand the practical applications of EP composites in industrial engineering.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 10
·13893-13904
·
IF 4.223
Wang He,Liu Congzhi,Ma Xiaofei,Wang Yong
In this work, polymers containing a large number of benzene rings and multiple functional groups were designed to remove aromatic organic pollutants. Using tetrafluoroterephthalonitrile (TFTPN) as a rigid crosslinking agent to crosslink different functionalized phenylcarbamoylated-β-cyclodextrin derivatives to prepare a series of porous multifunctional cyclodextrin (CD) polymerizations, including three preliminary polymerized adsorption materials and a mix β-cyclodextrin polymer (X-CDP) prepared via a secondary crosslinking procedure of the above three materials. The X-CDP preparation process connects the pre-formed nanoparticles and increases the presence of linkers inside the particles. At the same time, X-CDP exhibited porous structure with various functional groups such as nitro, chlorine, fluorine, and hydroxyl. Those special characteristics render this material with good adsorption ability towards various aromatic organic pollutants in water, including tetracycline, ibuprofen, dichlorophenol, norfloxacin, bisphenol A, and naphthol. Especially, the maximum adsorption capacity for tetracycline at equilibrium reached 110.56 mg·g −1 , which is competitive with the adsorption capacities of other polysaccharide adsorbents. X-CDP removed organic contaminants much more quickly than other adsorbents, reaching almost ~95% of its equilibrium in only 30 s, and the rate constant reaches 2.32 g·mg −1 ·min −1 . The main adsorption process of the pollutants by X-CDP fitted the pseudo-second-order kinetic and Langmuir isotherm well, indicating that the adsorption process is monolayer adsorption. Moreover, X-CDP possessed the good reusability where the pollutant removal rate was only reduced 8.3% after five cycles. Such advantages render the polymer great potential in the rapid treatment of organic pollutants in water bodies.
✓ 已验证
DOI
PubMed
高影响因子
COLLOID AND POLYMER SCIENCE
·
2021
·Vol. 299
·期 11
·1797-1805
·
IF 1.931
Li Saiyao,Wang Yang,Li Ting,Ma Piming,Zhang Xuhui,Xia Bihua,Chen Mingqing,Du Mingliang,Dong Weifu
Organic filters in traditional sunscreens usually are limited photodegradation and easily penetrate the stratum corneum and epidermal layer, leading to potential harmful effects. Melanin is a natural ubiquitous pigment that protects living organisms from intense sunlight. Inspired by the structure and function of the mussel adhesive protein, a facile strategy involving oxidative polymerization of dopamine was proposed for surface modification of titanium dioxide (TiO 2 ) to obtain melanin/TiO 2 nanoparticles. The thickness of melanin layers was varied from 1 to 7 nm by changing pH and dopamine concentration. The melanin/TiO 2 nanoparticles with 1-nm-thick melanin layers showed highly efficient UV-shielding ability due to synergistic effect of melanin and TiO 2 . The melanin/TiO 2 nanoparticles were introduced as the sole active ingredient to formulating sunscreen; sun protection factor (SPF) could reach 116.9 and 162.4 with a loading of 10 wt% and 15 wt%, respectively. Most importantly, melanin exhibits a good bioadhesion property and can effectively prevent the penetration of melanin/TiO 2 nanoparticles. Thus, the as-prepared nanoparticles possess excellent UV-shielding capacity and biocompatibility, ensuring their superior performance and safe use in the sunscreen. Graphical abstract Inspired by the structure and function of the mussel adhesive protein, a facile strategy involving oxidative polymerization of dopamine was proposed for surface modification of titanium dioxide (TiO 2 ) to obtain melanin/TiO 2 nanoparticles. The melanin/TiO 2 nanoparticles with 1-nm-thick melanin layers showed highly efficient UV-shielding ability due to synergistic effect of melanin and TiO 2 . Most importantly, melanin exhibits a good bioadhesion property and can effectively prevent the penetration of melanin/TiO 2 nanoparticles. Thus, the as-prepared nanoparticles possess excellent UV-shielding capacity and biocompatibility, ensuring their superior performance and safe use in the sunscreen.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 22
·26655-26665
·
IF 2.478
Yang Chengyu,Li Junkai,Lu Yang,Shan Yiting,Xian Qianqian,Zhou Hongqing
CaO-B 2 O 3 -SiO 2 (CBS) glass ceramic with various glass network modifiers were synthesized to develop a kind of material sintered at low temperature for multi-layer ceramic substrates. The influence of double alkali metal oxides (Na 2 O and K 2 O) on sintering characteristics, microstructures and dielectric properties of CBS glass ceramic were investigated. XRD analysis showed that the major crystalline phase was β-CaSiO 3 and CaB 2 O 4 , and the strength of the peak increased with the addition of network modifiers. DSC curve revealed that the process of crystallization and softening were obviously affected. SEM photographs exhibited that the microstructures were composed of amorphous phases, pores and crystalline phases. FTIR showed that the additives changed the continuity of CBS glass structure. An appropriate amount of Na 2 O and K 2 O additives could significantly improve the sintering characteristics and dielectric properties. CBS samples with 1.5 wt% (Na 2 O + K 2 O) sintered at 850 °C for 15 min presented the best performances with the bulk density of 2.53 g/cm 3 , ε r = 5.94 and tan δ = 1.22 × 10 −3 at 10 GHz.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）