JOURNAL OF POLYMER RESEARCH
·
2015
·Vol. 22
·期 11
·1-8
·
IF 1.92
Chen Feng,Kan Ze,Hua Sun,Liu Zhengying,Yang Mingbo
A study has been made on an attempt to further expand the current knowledge in melt processing of cellulose. The basic idea is that a few zinc compounds may remain in the regenerated cellulose by formation of a zinc-cellulose complex and hydrolysis reaction when ZnCl 2 molten hydrates are used as a solvent for cellulose. The chance is that zinc compounds may act as isolation agents to destroy the hydrogen bonding and reduce the crystallinity of cellulose. Interesting results revealed that the raw cellulose and regenerated celluloses in our work showed different structures and other, but specific, thermal behavior, admitting that the melting of cellulose was not detected. The results are preliminary but demonstrate that simply destroying the hydrogen bonding and reducing the crystallinity will promote the dehydration of cellulose at a lower temperature, since the activity of the cellulose hydroxyls would be improved unexpectedly in that condition. It is expected that this study will stimulate some new ideas to make some progress in the melt processing of this material.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2020
·
IF 6.289
Yuxin Wang,Linlin Guan,Zhen He,Shengping Zhang,Harshpreet Singh,Muhammad Dilawer Hayat,Caizhen Yao
Aluminum often requires protective coatings to prevent corrosion. The aluminum alloy substrate usually needs pretreatment to minimize, stabilize or convert the surface oxide in order to achieve adequate coating adhesion. The electrodeposited Ni-P coating is a promising candidate as a protective coating due to its easy fabrication and excellent performance. This study comprehensively investigates the pretreatment of zincating and anodizing on 6061 aluminum alloy, and systematically discusses their influence on the electrodeposited Ni-P coatings. The crystal structure and elemental composition were investigated for interlayers and Ni-P coatings subsequently, while morphologies of the coating surface and cross-section were also determined. The results revealed similar phase composition for differently pretreated Ni-P coatings, while distinct nodule featured morphology was observed for anodized Ni-P coating. It was found that anodized Ni-P coatings had the best performance due to its superior coating adhesion, wear-resistance, and corrosion resistance. In contrast, severe wear damage was occurred to zincated Ni-P coatings due to its inferior microstructure and weak zinc interlayer. Lastly, the influence of anodizing pretreatment on the coating microstructure is discussed, and a model is proposed for Ni-P electrodeposition employing anodizing pretreatment.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2025
·
IF 3.9
Wuyi Feng,Jiantao Fu,Mengwei Li,Jing Liu,Jiatao Zhang,Di Zhao
Graphical The transition metal zinc compounds engineered by the oxygen group elements have been investigated, revealing a positive correlation between the selectivity of two-electron oxygen reduction reaction and their electronegativity. It is noteworthy that ZnO/C demonstrates a hydrogen peroxide Faraday efficiency (FE) exceeding 90% across an extensive potential range under neutral conditions. The electrocatalytic two-electron oxygen reduction reaction (2e − ORR) is anticipated to supersede the energy-intensive and environmentally adverse anthraquinone process for decentralized and small-scale H 2 O 2 production. Designing cost-effective 2e − ORR electrocatalysts with clear structure-activity relationships for neutral media remains challenging. Here, we employ an appropriate method to introduce oxygen group elements, including O, S, Se, and Te, to synthesize a series of carbon-supported transition metal Zn compounds regulated by different anions. The phase composition was verified using electron microscopy and X-ray techniques. Among the four electrocatalysts tested under neutral conditions, ZnO/C exhibited the highest 2e − ORR selectivity, whereas ZnTe/C showed the lowest. The trend was positively correlated with the electronegativity of the oxygen group elements. Meanwhile, the H 2 O 2 yield of ZnO/C in an H-cell can reach 5.72 mg cm −2 h −1 at 0 V versus RHE, with a maximum Faraday efficiency of 95%, and it also exhibits excellent durability. This work offers novel insights into the future design of heteroatom-doped carbon-supported transition metal compounds and the analysis of catalytic activity origins through diverse methodologies.
研究领域:
材料科学
·
电化学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Zhihua Wu,De Zhao,Yanhua Zhang,Lili Huang,Hui Huang,Qianqian Guo,Wei Zhang,Chengyi Hou,Hongzhi Wang,Qinghong Zhang,Yourong Duan,Yaogang Li
The efficient capture of rare circulating tumor cells (CTCs) with high viability is of great importance in cancer diagnosis. The integration of three-dimensional (3D) nanobiointerfaces with capillary flow channel platforms can efficiently improve CTC capture performance by providing abundant binding sites and increasing the likelihood of contact as samples flow through the microchannels. However, due to the complex preparation processes, facile synthesis of nanostructures for use as substrates in flow channels for biomedical applications is still challenging. To reduce the encapsulation steps in the fabricating of nanostructured flow channel devices, we chose the enclosed glass capillaries as flow channels and accomplished all the experiments in the microchannels, including 3D nanostructure synthesis, surface modification and capture/release of CTCs. In this work, we constructed a novel 3D Zn(OH)F/ZnO nanoforest array in capillaries for CTC isolation via a facile microfluidic wet chemistry method. Because of the abundant binding sites of the 3D Zn(OH)F/ZnO nanoforest array, the capture efficiency was remarkably enhanced compared with that of vertical nanowires (90.3% vs 69.1%). In addition, a high release efficiency and cell viability of released cells were achieved by grafting poly( N -isopropylacrylamide) (PNIPPAm). These results may provide evidence for a novel method to fabricate hierarchical 3D substrates with a combination of biomolecule recognition and topographical interaction for biomedical applications.
研究领域:
生物医学工程
·
肿瘤学
·
材料科学
✓ 已验证
DOI
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Ran Du,Wan Li,Jiawei Li,Shan Zeng,Zhongqin Chen,Jialong Gao,Huina Zheng,Haisheng Lin,Guoping Zhu,Xiaoming Qin,Wenhong Cao
Oyster hydrolysates exhibit promising potential as a zinc supplement for its significant amounts of zinc, however, the zinc chemical speciation which determines zinc nutrition in oyster hydrolysates has not been investigated. This study optimized the oyster hydrolysis conditions using the Response surface methodology (RSM) method, and the zinc chemical speciation, the sequence of zinc-containing peptides, and the binding sites of zinc and peptides were further investigated. Results showed that inorganic and organic zinc in oysters were 60.15% and 36.53% of total zinc respectively, while organic zinc in oysters aqueous extract was 4.54% of which 3.56% was present in the polysaccharide fraction. The zinc yield was 84.20% of total zinc under optimal hydrolysis conditions, while the organic zinc increased to 52.93% of which 38.14% existed in the protein/peptides fraction. Zinc in protein/peptide fraction primarily was bound to low-molecular-weight peptides (Mw < 1000 Da). Further, 42 shared zinc-containing peptides (mainly 3–4 peptides) were identified. Molecular docking indicated that Glu, Leu , and Tyr might be the binding sites for zinc and peptides. These findings provided a theoretical basis for the development of novel and safe zinc dietary supplements.
研究领域:
食品科学
·
营养学
·
生物化学
·
海洋生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2023
·
IF 6
Daiyun Gu,Jianru Li,Cunying Xu,Shuxian Wang,Guilin Xiang,Wenkang Chen,Qibo Zhang,Yixin Hua,Yan Li
The influence of existing form of different zinc compounds on the electrochemical behavior of zinc was investigated in choline chloride-urea (ChCl-urea) deep eutectic solvent (DES). Raman and ESI-MS analyses indicate that complexes [ZnCl 4 ] − , [Zn(H 2 O)Cl 3 ] − and [ZnO⋅urea⋅Cl] − are presented in the ChCl-urea DES containing ZnCl 4 , ZnSO 4 ⋅7H 2 O and ZnO, respectively. The zinc compounds were found to vary reduction overpotential of Zn(II) ions in the order ZnO > ZnSO 4 ⋅7H 2 O > ZnCl 4 , while their reduction and diffusion rate in a sequence ZnSO 4 ⋅7H 2 O > ZnCl 4 > ZnO. This may be due to the formation of various Zn(II) complexes and oligomers. The chronoamperometric transient analysis shows that Zn electrodeposition in ChCl-urea DES with ZnCl 2 or ZnO as a precursor follows instantaneous nucleation mode, while ZnSO 4 ⋅7H 2 O is changed to a more progressive one. Besides, the zinc compounds can alter the rate of nucleation, influencing the morphology of zinc deposits. The ChCl-urea DES containing ZnSO 4 ⋅7H 2 O or ZnO is conducive to electrodeposition of a smooth and dense zinc coating. The XRD analysis of the deposits displays that part of the deposited zinc is able to alloy with copper substrate to form the Zn-Cu surface alloy, and the amount of the alloy depends on zinc compound. These findings promise a cheap and simple route for production of Zn coating directly form Zn secondary resources.
研究领域:
电化学
·
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）