Silicon
·
2023
·Vol. 15
·期 16
·6997-7004
·
IF 3.4
Chen Gaopan,Luo Haimei,Zhou Yan,Pan Liyan,Luo Guihai,Pan Guoshun
SiO 2 based slurry was an ideal solution for addressing element pollution in fused silica polishing. However, it was still a huge challenge to enhance polishing efficiency. Herein, lignin was added into colloidal silica to manipulate SiO 2 particles, thereby improving the removal efficiency of fused silica. Specifically, the variations of average particle size ( Z -Average) and polymer dispersity index ( PDI ), -OH groups on particles surface, wettability and viscosity of colloidal silica with addition lignin in the range of 0–5% were introduced. Also, adhesion action and tribological characteristics with and without manipulation in polishing process were studied. Removal mechanism of fused silica using SiO 2 based slurry and the key factors to improve polishing performance were discussed at different content of lignin. Colloidal silica was stable at lignin content of 2%, at which material removal rate ( MRR ) was increased by 216% and surface roughness ( Ra ) achieved 0.118 nm. This study embarked from abrasives variations directly (particles characteristics) and indirectly (colloidal silica) intending to reveal the change of removal mechanism on fused silica polishing. It provided new insights for fused silica polishing definitely.
✓ 已验证
DOI
高影响因子
IONICS
·
2023
·Vol. 30
·期 3
·1677-1690
·
IF 2.8
Ye Jiankang,Fu Qingshan,Ye Ang,Xu Changkangle,Zhou Feiyu,Chen Xuedan,Zhu Wenli,Chen Jian
Continuous efforts are always being made to reinforce biochars’ properties for large-scale utilization in new energy devices. Here, a pre-burning treatment is introduced for preparing the biochars from shaddock peel, longan pericarp, and loofah sponge. The results of XRD demonstrate more disordered structures are caused in the prepared biochars by the pre-burning, which also introduces more oxygen-containing functional groups on the biochars’ surface discovered by the FTIR and XPS tests. The N 2 adsorption–desorption results indicate that the pre-burning can facilitate pore formation in the biochars, boosting specific surface area and pore volume, significantly reducing the average pore size of biochars. Specifically, for the loofah sponge based biochar, the pre-burning treatment causes an increase in specific surface area (from 271 to 973 m 2 g −1 ), a rise in pore volume (from 0.22 to 0.53 cm 3 g −1 ), and a decrease in average pore diameter (from 3.21 to 2.3 nm). The specific capacitance of the supercapacitor with the loofah sponge based biochar electrodes is raised from 85.4 to 170 F g −1 at 0.5 A g −1 by the pre-burning treatment. Besides, the longan pericarp-derived biochar with the pre-burning treatment achieves a power density of 5000 W kg −1 under an energy density of 21.81 Wh kg −1 . We believe the pre-burning treatment is an effective and convenient route for the reinforcement of biochars.
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2024
·Vol. 32
·期 7
·3142-3158
·
IF 4.7
Mo Yanping,Cheng Zhiru,Xie Yuhui,Chu Junhan,Xie Shuangyu,Meng Yang,Wu Feng,Feng Dong,Mei Yi,Xie Delong
Flexible polyurethane foam (FPUF) has a widespread application across aerospace, furniture and vehicles, while its flammability always arouses severe safety concerns. Herein, a novel, bio-based flame retardant, i.e. polyol (PADEA) that contains phosphorus and nitrogen elements, was successfully synthesized by using phytic acid (a bio-organic acid) and diethanolamine as crude materials. Then, PADEA partially substituted the commercial polyether polyols in the foaming process, during which PADEA reacted in situ with isocyanate to construct an inherently flame-retardant FPUF. Due to the purposive designed P-N synergistic molecular structure, PADEA can serve as a highly efficient intumescent flame-retardant (IFR) system. When 40 php (ca. 21.51wt%) PADEA was added into the system, the limiting oxygen index (LOI) of the obtained FPUF reached up to 24.1%, achieving a 22.0% increase compared to that of primitive FPUF without PADEA. Moreover, the addition of PADEA can considerably reduce the total number of melt drips in the UL-94 HB rating test. And the cone calorimeter (CC) results demonstrated a 47.08% reduction in total heat release (THR) was achieved as 40 php PADEA was added. At the end, various characterization methods were carried out, revealing the flame-retardant mechanism of PADEA both in condense and gaseous phase. This work highlights a facile and green strategy for designing functional polyol to address the flame-retardant issues of high-performance FPUF. Graphical
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 11
·16795-16804
·
IF 0
Li Haiyu,Xu Mingze,Zhang Tingsong
The issue of water pollution has emerged as a formidable challenge, prompting a pressing need for solutions. The utilization of metal nanoparticles with surface plasmon resonance and semiconductor composite photocatalysts is regarded as a highly effective approach to solve this problem. g-C 3 N 4 is an effective catalyst for the degradation of organic pollutants. Its photocatalytic performance is usually enhanced by the use of the noble metal Au Ag. However, the high cost of these materials limits their application. In this study, we present the synthesis of Al NPs/g-C 3 N 4 nanocomposites using the bridging effect of ligands. The characterized of transmission electron microscopy (TEM), X-ray diffractometer (XRD) and ultraviolet-visible spectroscopy (UV-Vis) proved that Al NPs/g-C 3 N 4 with a wider light absorption range were successfully synthesized. The effects of ligands, (glutathione (GSH), glutamic acid (GAG), and cysteine (CYS)), Al diameter (40 to 200 nm) and the ratio of Al to g-C 3 N 4 (1:1 to 5:1) on the photocatalytic degradation of methylene blue (MB) by Al NPs/g-C 3 N 4 were also evaluated. The results showed that the optimum degradation efficiency of Al NPs/g-C 3 N 4 for MB at 5 mg/L reached 100% within 60 min, which was 11 times higher than that of pure g-C 3 N 4 . The principal analysis of Al enhancing the photocatalytic performance of g-C 3 N 4 was studied through transient photocurrent spectroscopy (TPC), electrochemical impedance spectroscopy (EIS), and steady-state transient fluorescence spectroscopy (PL). The results confirmed that hot carriers generated by localized surface plasmon resonance (LSPR) of Al nanoparticles increase the carrier concentration. In addition, the Schottky barrier generated by Al and g-C 3 N 4 could also improve the carrier separation rate and increase the carrier lifetime. This work is expected to solve the problem of organic wastewater treatment and lay the foundation for subsequent research on photocatalysis. Graphical abstract
✓ 已验证
DOI
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 10
·4354-4365
·
IF 3.5
Liu Chang,Li Ning,Niu Li,Li Xu,Feng Jacko,Liu Zhiming
The crosslinked of hydroxypropyl methylcellulose (HPMC) and sodium alginate (SA) with a range of weight ratios formed blend films. Antibacterial packaging films (HPMC/ZA blend film) were prepared by simple ion exchange method with HPMC/SA blend film. The mixture of Zn 2+ gave a plenty effect of the prepared films. The microstructure, physical properties, structure, and antibacterial properties of crosslinked films were investigated in detail. It was found that the infrared shifted peaks of O–H stretching and O–H bending in crosslinked HPMC/ZA film, which was caused by the formation of hydrogen bond between HPMC and ZA. SEM images of HPMC 5 /ZA 5 blend film exhibited rougher structure. In addition, the light transmission, thermal properties, water vapor permeability, and antibacterial activity of HPMC 5 /ZA 5 blend film are obviously enhanced, compared with HPMC/SA blend film. Furthermore, HPMC 5 /ZA 5 blend film exhibited better antibacterial activity against S. aureus and E. coli , revealing the possible application on food packaging.
✓ 已验证
DOI
高影响因子
Journal of Coatings Technology and Research
·
2023
·Vol. 20
·期 6
·1867-1880
·
IF 2.3
Xue Tao,Yu Caili,Zhou Zhongqun,Zhang Faai
Achieving functional styrene–maleic anhydride (SMA) copolymer dispersant is highly attractive but still remains a challenge. Conventional modified SMA dispersants have complex modification steps, poor performance, and limited applications. Thus, a series of styrene–maleimide (SMI) copolymers with different functionality as amphiphilic dispersants for dispersing nano-SiO 2 in an aqueous solution were synthesized using a simple preparation process. The changes in the maleic anhydride groups during imidization were tracked using FTIR spectroscopy, 1 H-NMR, and GPC. A rotational viscometer and an inverted bottle method were used to measure the viscosity and coagulation time of the nano-SiO 2 aqueous dispersion system, respectively, after adding the SMI dispersants. The particle size, size distribution, and dispersant adsorption amount of the dispersion were analyzed using laser particle size analysis; FTIR spectroscopy and SEM; and TGA, respectively. The results showed that the hydrogen bonds formed between the amino groups in the dispersant and the hydroxyl groups on the SiO 2 surface during stirring allowed the dispersant to be adsorbed onto the SiO 2 surface after being added to the nano-SiO 2 aqueous system. The addition of the SMI dispersant enhanced the steric hindrance and electrostatic repulsion between the nanoparticles, thus making it possible for the SiO 2 nanoparticles not to easily aggregate in water, improving their dispersity and stability. Additionally, the type and amount of SMI dispersant used significantly affected the SiO 2 nanoparticles' ability to disperse in water. This makes SiO 2 particles convenient to use and transport, not produce dust pollution, and easy to store. Graphical abstract
✓ 已验证
DOI
高影响因子
Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-7
·
IF 2.584
Xia Fangqing,Yong Huaisong,Han Xiao,Sun Dazhi
Exfoliation of layered inorganic nanomaterials into single-layered sheets has been widely interested in materials chemistry and composite fabrication. Here, we report the exfoliation of layered zirconium phosphate nanoplatelets by using small molecule intercalating agents in ionic liquids, which opens a new platform for fabricating single-layered inorganic materials from synthetic layered compounds.
✓ 已验证
DOI
高影响因子
RARE METALS
·
2022
·Vol. 42
·期 1
·146-154
·
IF 6.318
Wu Yun-Feng,Ma Ji-Wei,Huang Yun-Hui
Designing highly active and durable electrocatalysts towards oxygen reduction reaction (ORR) plays a paramount importance for proton exchange membrane fuel cells. Pt-based binary alloys Pt-M (M = 3d-transition metals) possessing excellent electronic and geometric properties have received increasing interests as highly active electrocatalysts. Herein, we report a series of Pt x Co/C ( x = 1, 2, 3) catalysts by a facile one-pot soft-chemistry method. In the acidic conditions, the mass activities of PtCo/C, Pt 2 Co/C and Pt 3 Co/C are 0.526, 0.462 and 0.441 A·mg Pt −1 , which are 2.60, 2.31 and 2.22 times higher than that of Pt/C (0.200 A·mg Pt −1 ), respectively. The specific activities of PtCo/C, Pt 2 Co/C and Pt 3 Co/C are 706.59, 679.41 and 801.83 μA·cm −2 , which are accordingly 2.89, 2.76 and 3.28 times higher than that of Pt/C (244.75 μA·cm −2 ). Notably, Pt 3 Co/C shows a remarkable durability. After 5000 cycles of the accelerated durability testing, the mass activity and specific activity of Pt 3 Co/C catalyst are 2.47 and 3.80 times higher than that of the commercial Pt/C, respectively. The improved ORR activity and durability can be ascribed to the synergistic interaction between Pt and Co. Graphical
✓ 已验证
DOI
高影响因子
Science China-Chemistry
·
2024
·Vol. 67
·期 4
·1242-1249
·
IF 10.4
Zhang Jingjing,Deng Yongyan,Gai Dongxu,Shi Yang,Feng Xingwen,Li Peilong,An Yongtao,Zou Xiaoqin
Isotopic separation is of paramount importance for producing high-purity heavy hydrogen, yet the process remains hugely challenging. Here, we report on an Fe/ZSM-5 zeolite that was able to efficiently separate deuterium from protium via chemical quantum sieving. Structural data showed that four types of Fe species were present in Fe/ZSM-5 and oligomeric Fe–O clusters in the zeolite pores were correlated directly with gas selectivity. Gas adsorption revealed that Fe–O species served as the main adsorption sites and interacted with D 2 more strongly than with H 2 . D 2 /H 2 separation was exemplified using thermal desorption spectroscopy. D 2 /H 2 selectivity increased with Fe loading in Fe/ZSM-5 and a selectivity of 32.1 was obtained with an optimal loading of 7 wt%. The shift of desorption temperature supports the chemical affinity-based quantum sieving of D 2 over H 2 . This study demonstrates an effective strategy for enhancing D 2 /H 2 separation and the high selectivity means that Fe/ZSM-5 has strong potential in hydrogen isotope separation.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2015
·Vol. 50
·期 17
·5729-5738
·
IF 2.371
Sun Shao-Xing,Xie Rui,Wang Xiao-Xue,Wen Guo-Qing,Liu Zhuang,Wang Wei,Ju Xiao-Jie,Chu Liang-Yin
Compared to phase-change fibers with hydrophilic polymer shell, those with hydrophobic polymer are more stable in water and moist environments. However, their fabrication processes are involved in some toxic organic solvents. Here, the nanofibers with phase-change material (PCM, i.e., octadecane) as core and hydrophobic shell (i.e., polyvinyl butyral) are fabricated via coaxial electrospinning using environmental friendly ethanol as solvent. Effects of the polyvinyl butyral concentration in ethanol solution as well as the flow rates of core and shell fluids on the morphology of octadecane/polyvinyl butyral (PCM/PVB) nanofibers are systematically investigated. The thermo-regulating capability of PCM/PVB nanofibers is demonstrated by observing the surface and inner temperatures of model houses covered with fibers. The higher the PVB concentration and the shell flow rate are, the better the morphology of core/shell PCM/PVB nanofibers becomes, leading to higher encapsulation efficiency. At a constant shell flow rate, the encapsulation ratio of PCM/PVB nanofibers increases with the core flow rate. The encapsulation ratio of the PCM/PVB nanofibers, which fabricated with PVB concentration of 20 % (w/v) and at the core flow rate of 0.60 ml h −1 and the shell flow rate of 3.0 ml h −1 , respectively, reaches to the maximum of 46.4 %. The corresponding melting enthalpy (Δ H
m ) and the crystallization enthalpy (Δ H
c ) of these PCM/PVB nanofibers are 105.9 and 106.5 J g −1 , respectively. The PCM/PVB nanofibers exhibit good thermo-regulating capability under the simulated solar irradiation, regulating the temperature at around 28 °C. The resultant PCM/PVB nanofibers exhibit satisfactory stability and repeatability in the thermo-regulating capability during repeated heating/cooling cycles. The results provide valuable guidance for environmental friendly preparation of phase-change nanofibers with satisfactory and stable thermal characteristics.
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 21
·9003-9013
·
IF 3.553
Huang Jiyu,Jiang Jinchun,Hu Liang,Zeng Yiyu,Ruan Shuangchen,Ye Zhizhen,Zeng Yu-Jia
A heterojunction photodetector formed by CuO–Ga (CuGaO) and ZnO–S (ZnSO) thin film has been fabricated by solution combustion synthesis and magnetron sputtering. The band structure of CuGaO/ZnSO heterojunction is studied by using X-ray photoelectron spectroscopy. The valance band offset of CuGaO/ZnSO is calculated to be 0.38 eV by using the Kraut equation. The device shows a responsivity of 3.78 mA/W and a detectivity of 1.16 × 10 10 Jones under 365 nm ultraviolet (UV) illumination, when operated as a self-powered (zero bias) UV photodetector. The average rise and decay times can be calculated as 0.034 s and 0.027 s, respectively. The CuGaO/ZnSO heterojunction is a promising candidate for the application in self-powered UV photodetection.
✓ 已验证
DOI
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2021
·Vol. 39
·期 8
·975-983
·
IF 3.603
Li Hui-Xian,Hou Lei,Wu Pei-Yi
The time-resolved attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy is employed to investigate the transport mechanism of gel electrolytes by monitoring the diffusion behavior of propylene carbonate-lithium bis(trifluoromethylsulfonyl)imide (PC-LiTFSI) solution through poly(vinylidene fluoride- co -hexafluoropropylene) (P(VDF-HFP)) films. Fickian behavior has been observed for both TFSI − and PC. Higher temperature leads to faster diffusion of TFSI − and PC, which could be related to the increased free volume in P(VDF-HFP) matrix and rapid molecular movements upon heating. Various molecular interactions among LiTFSI, PC and P(VDF-HFP) have been recognized. During the diffusion process, PC molecules, in the form of small clusters, can firstly diffuse through the P(VDF-HFP) film and interact with P(VDF-HFP) by dipole-dipole interaction, acting as the plasticizer. Then, Li + diffuses into P(VDF-HFP) with the help of ion-dipole interactions between Li + and C-O of PC. Meanwhile, TFSI − diffuses through the polymer matrix in solvation states. In addition, slight ion-dipole interactions between Li + and P(VDF-HFP) have been observed as well. Results in this work contribute to a better understanding of transport process in gel polymer electrolytes for lithium-ion batteries and support the development of improved gel polymer electrolytes by rationally regulating molecular interactions.
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）