MATERIALS CHEMISTRY AND PHYSICS
·
2024
·
IF 4.3
Jiayu Chen,Liyuan Zhang,Runzhong Yu
In this work, a stable, simple, and efficient Thermally Oxidized Porous Silicon/Zinc Oxide biochip substrate was fabricated based on the advantages of porous silicon substrate and Zinc Oxide nanomaterials. It was also investigated as an efficient substrate for enhanced fluorescence performance in detecting toxins. Porous Silicon was prepared by electrochemical anodic corrosion method, and the optimum preparation conditions of Porous Silicon were explored to be current density of 80 mA/cm 2 and time of 20 min. Porosity, corrosion layer thickness and surface morphology of Porous Silicon were analyzed using gravimetric analysis and SEM. The fresh Porous Silicon was modified by combining with thermal oxidation method. The stability and optical properties of Thermally Oxidized Porous Silicon and fresh Porous Silicon were compared using Fourier transform infrared spectroscopy and Fiber optic spectroscopy. The reasons for the enhanced stability and optical properties were explored. Then the impregnation lift-off method was used to form oval shaped Zinc Oxide particles on Thermally Oxidized Porous Silicon. The fluorescence intensities were compared by binding the toxin aptamers on Thermally Oxidized Porous Silicon and Thermally Oxidized Porous Silicon/Zinc Oxide substrates, respectively. The reasons for the enhanced fluorescence properties were explored. The toxin to be tested had a stronger fluorescence signal on theThermally Oxidized Porous Silicon/Zinc Oxide substrate, which was favorable for improving the detection sensitivity.
研究领域:
材料科学
·
生物化学
·
纳米技术
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2021
·Vol. 94
·期 8
·1066-1071
·
IF 0.85
Vorobyova E. V.
Abstract The effect of fillers, metal oxide nanoparticles (Fe 3 O 4 , ZnO), on the thermal oxidation resistance of polyethylene inhibited by the phenolic antioxidant Irganox 1010 was studied. The distribution of nanoparticles in the polymer matrix was carried out by ultrasound, and the samples were formed by thermal pressing. Thermal oxidation resistance was determined by the duration of the induction oxidation period of film samples. It is shown that the pressure of the press during the formation of the material has a significant effect on the thermal oxidation resistance of the inhibited composite, both filled with nanoparticles of Fe 3 O 4 , ZnO, and unfilled. The nature of the effect of the concentration of the nanofiller on the thermal oxidation resistance of the samples depends on the metal oxide used. An increase in the concentration of the filler Fe 3 O 4 leads to a decrease in the thermal oxidation resistance of the polymer; when using ZnO, this dependence is inverse. The oxidation of the prepared nanocomposite film samples formed under high pressure conditions revealed synergistic effects of nanofillers and antioxidants.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
BIOMASS & BIOENERGY
·
2025
·
IF 5.8
Hanping Chen,Jiawen Zeng,Zhiqiang Chen,Mingwei Xia,Ying Gao,Danchen Zhu,Ziyue Tang,Haiping Yang,Yingquan Chen,Xianhua Wang
To improve the yield and fluorescence characteristic of lignin-based carbon dots, a two-step process of hydrothermal and oxidation was proposed to achieve efficient preparation of intense fluorescent lignin-based carbon dots (LCDs) in this study. N, S co-doped LCDs (NS-LCDs) and hydrothermal char were prepared by using mild sulfanilic acid as additive, then hydrothermal char as carbon source was oxidized and exfoliated to prepare high-yield oxidized LCDs (O-LCDs) via using NaOH and H 2 O 2 . It was found that the yields of NS-LCDs initially increased and then decreased with hydrothermal temperature increasing, reaching the maximum value of 5.71 % at 200 °C. And more than 50 % of the hydrothermal char was converted to O-LCDs by oxidative stripping, which resulted in the total yield of LCDs reached to 17.13 % at 200 °C. Meanwhile, the fluorescence quantum yield of NS-LCDs showed a similar trend, obtained a maximum value of 18.00 % at 200 °C, which was the same as content of C sp2 and C-N in XPS results. And the average particle size of NS-LCDs was less than O-LCDs, the average particle size 180-NS-LCDs was 3.61 nm, while that of 180-O-LCDs was increased to 3.92 nm. In addition, when the temperature was higher than 180 °C, the fluorescence lifetime of NS-LCDs was prolonged, which might be related to N and S doping, and 200-NS-LCDs showed good acid stability, temperature stability and photobleaching resistance. This study provides guidance for the application and preparation of high-quality LCDs.
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
Coatings
·
2022
·Vol. 12
·期 1
·68
·
IF 3.236
Xue Peng,Yanfei Lv,Shichao Zhao
Inorganic semiconductors usually show n-type characterization; the development of p-type inorganic semiconductor material will provide more opportunities for novel devices. In this paper, we investigated the chemical vapor deposition (CVD) of p-type cuprous phosphide (Cu3P) nanofilm and studied its thermal oxidation behavior. Cu3P film was characterized by optical microscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), laser Raman spectroscopy (Raman), and fluorescence spectroscopy (PL). We found that the thickness of film ranged from 4 to 10 nm, and the film is unstable at temperatures higher than room temperature in air. We provide a way to prepare inorganic phosphide nanofilms. In addition, the possible thermal oxidation should be taken into consideration for practical application.Keywords:cuprous phosphide;nanofilm;chemical vapor deposition;thermal oxidation
研究领域:
材料科学
·
半导体物理
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2014
·Vol. 5
·期 24
·7034-7041
·
IF 5.368
Chengsha Wei,Mingming Chen,Jiaojiao Tao,Xibo Wu,Majid Khan,Dong Liu,Ningdong Huang,Liangbin Li
In this paper, we described a new and simple method to produce degradable core cross-linking (CCL) micellar clusters that utilized CdS nanorods to assist thermal oxidation of the polythiol segment of a diblock copolymer, polystyrene-b-polythiol (PS-b-polythiol), at high concentration (2.3 wt%) in a common organic solvent (toluene). The CdS nanorods acted not only as catalysts, but also as templates. The diblock copolymer, PS-b-polythiol, was obtained by aminolysis of polystyrene-b-poly(2-(ethyl-xanthate)ethylmethacrylate) (PS-b-P1), a block copolymer synthesized via reversible addition–fragmentation chain transfer (RAFT) polymerization using a macroRAFT transfer agent, PS-CTA, and a methacrylate monomer that possessed a protected thiol group, in the presence of n-butylamine and tributyl phosphine. The CdS nanorods were synthesized conveniently by thermolysis of an alkyl xanthate, Cd-HDX. The TEM image clearly showed the formation of micellar clusters and the oxidation procedure was investigated by 1H-NMR and XPS. The formation of core cross-linking (CCL) micelles was confirmed to be reversible by reduction utilizing DTT as the reducing agent.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
VACUUM
·
2024
·
IF 3.8
Chunjiao Liu,Xiaodong Li
MXene can generate high-temperature pulses (HTP) by the physical/chemical coupling effect under laser irradiance and is a good initiator for laser ignition. The main obstacle in the application on laser ignition of MXene based materials is the incomplete oxidation and reduced energy output resulting from the inert TiO 2 passivation layer. In this study, we proposed an efficient approach to significantly enhance the thermal oxidation and energy release under laser irradiance by decorating hydrophobic 1H,1H,2H,2H-perfluorodecyltriethoxysilane (PFTE). The CFx produced by the decomposition of PFTE under laser irradiance can react with Ti atoms on the surface of MXene to prevent the formation of the oxide layer. This process releases a large amount of heat and completely oxidizes MXene. As expected, some rutile nano-crystals are distributed on the surface of fully oxidized MXene and the energy output of MXene/PFTE composite is 6.1–8.3 kJ/g which is much higher than pristine MXene. The mechanism of the thermal oxidation process is proposed to explain the enhanced energy output of the MXene/PFTE by thermal analysis and time-resolved emission spectrum (TR OES). Furthermore, the MXene/PFTE membrane significantly enhanced the laser ignitibility of 2,4,6,8,10,12-(hexanitrohexaaza)cyclododecane (CL-20) reducing the laser intensity and shortens the ignition time.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Nanoscale
·
2022
·Vol. 14
·期 13
·5002-5009
·
IF 8.307
Tiantian Dai,Zanhong Deng,Shimao Wang,Xiaodong Fang,Gang Meng
With features of innate tunnels and oxygen vacancies derived from a unique geometrical structure and sub-stoichiometric compositions, W18O49 nanowires have been explored as multifunctional materials with diverse applications. Though thermal oxidation offers a facile method to synthesize patterned W18O49 nanowires, the relatively high growth temperature (≳500 °C) hinders their emerging applications in flexible or wearable electronics. In this work, aiming to lower the growth temperature of W18O49 nanowires by thermal oxidation, the temperature and oxygen partial pressure dependent growth has been systematically investigated for both W films and powders. W18O49 nanowires could be steadily obtained with appropriate temperature and oxygen pressure ranges for both cases, while the growth temperature of a W film (metastable β phase dominant) could be much lower than that of W powder (α phase). The structural analysis indicates that metastable β-W is susceptible to oxidation in comparison with α-W and thus generates oxidation-induced chemical compression for nanowire growth. The growth temperature of W18O49 nanowires could be reduced to ca. 400 °C, which paves the way for the in situ patterning of W18O49 nanowires on indium-tin-oxide (ITO) glass substrates and flexible substrates.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yuxuan Feng,Shuhui Chen,Kaisheng Hua,Hui Li,Dong Jiang,Lujie Sheng,Dan Zhao,Jizhong Ren
Thermally rearranged(TR) polymers are usually prepared at an insert atmosphere and display high gas permeability, but their low gas selectivity results in high energy consumption. Thermal oxidation is an effective method to enhance the gas selectivity of microporous polymers. In this work, the effect of oxygen in the purge environment on imide-to-benzoxazole conversion and membrane structures was investigated. 1% oxygen content of the purge environment could restrain imide-to-benzoxazole conversion of 6FDA-DETDA/bisAPAF hydroxyl block polyimide(bHPI) membranes effectively, and oxygen induced the oxygen bridge formation, improving the gas selectivities of the resulting thermal-oxidative membranes with the increased oxygen content. Thermal-oxidative PBOCI membranes (TO-PBOCI) based on block poly(benzoxazole-co-imide)(PBOCI) precursor membranes were prepared to enhance gas separation performance of microporous polymers. The stable polybenzoxazole structures and microphase separation of polybenzoxazole blocks maintained membrane structures and the gas transport channels in the thermal-oxidative process at high temperature. Significantly, the remaining hydroxyl groups in PBOCI precursor membranes were beneficial for oxygen bridge formations of TO-PBOCI membranes, enhancing H 2 /CH 4 selectivity. As a result, the TO-PBOCI membranes treated at a high temperature kept high H 2 permeability and H 2 /CH 4 selectivity, surpassing the 2008 Robeson upper bound. The study about TO-PBOCI membranes promotes a better understanding of the polymeric materials and process development of microporous polymer membranes for hydrogen separation applications.
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
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
·
2022
·
IF 0.672
Peimiao Deng,Weiguang Xie,Junlong Chen,Honglong Ning,Xiao Fu,Xu Zhang,Weijian Yuan,Yiping Wang,Rihui Yao,Junbiao Peng
Stannous oxide (SnO) is prepared by a sol–gel reaction, and the intermediate product is a white gel material, Sn6O4(OH)4, which is decomposed by a constant temperature heat treatment to form a regular black crystal, and the size reach 300 μm approximately. TG-DSC analysis shows that under air atmospheric conditions, SnO undergoes an oxidation and thermal decomposition reactions at 350 °C, which to form SnO2, Sn, and Sn3O4. With the temperature increasing, the reaction will continue and the final product will be SnO2. X-ray photoelectron spectroscopy (XPS) analysis shows that SnO is sensitive to oxygen. It is placed in air for about 2 months, and 81.8% of the crystal surface is oxidized to SnO2, but the inside of the crystal remains as SnO. Few layer crystal sheets was prepared by mechanical exfoliation with a thickness of 85 nm and a surface roughness of 1.02 nm, which provides a possibility for the application of few layers of SnO crystals to transparent and flexible electronic devices.
研究领域:
材料科学
·
表面科学
✓ 已验证
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2024
·Vol. 35
·期 12
·e6591
·
IF 3.1
Chuanbo Cong,Mingyang Yuan,Han Wang,Rehan Umer,Daigang Peng,Jianglin Ouyang
In order to improve the thermal stability of silicone rubber (SR), cerium-tin composite oxides (CeSnO-x) are used as thermo-oxidative stabilizer in phenyl methyl vinyl silicone rubber (PVMQ). CeSnO-x are synthesized via the sol–gel method and characterized by scanning electron microscopy, x-ray diffraction, and X-ray photoelectron spectroscopy (XPS) showing that tin doping led to more oxygen vacancies in CeSnO-x compared to CeO 2 . Through thermogravimetric analyzer, differential scanning alorimetry (DSC) and average activation energy calculation of PVMQ with different thermo-oxidative stabilizer, it was found that CeSnO-8 is outperforming CeO 2 , SnO 2 , and their mixtures in improving the thermo-oxidative stability of PVMQ. In mechanical property tests, due to tin doping, CeSnO-8 exhibit superior performance at all stages during thermo-oxidative aging comparing the different effects of CeO 2 and SnO 2 in different aging stages. XPS of PVMQ composites investigate the mechanism by which CeSnO-8 exhibit different effects. Fourier transform infrared spectroscopy characterizing the Si-C and Si-O bond changes in PVMQ composite before and after aging and the measurement of Mc explore thermo-oxidative stabilizers' role during thermo-oxidative aging of PVMQ. Thermogravimetry-infrared spectroscopy comparisons between unstabilized PVMQ and CeSnO-8-stabilized PVMQ show that CeSnO-8 effectively quenched radicals produced by the oxidation of the PVMQ side group, but exacerbate degradation caused by molecular chain rearrangement.
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
COMBUSTION AND FLAME
·
2024
·
IF 5.8
Wenke Zhang,Peihui Xu,Daolun Liang,Jianzhong Liu
Studying the ignition and combustion performances of modified aluminum-based metallic fuels in variable oxidizing atmospheres is highly important for large-scale space exploration. In this study, Al–B–Mg multi-metal composite powders (MMP) were prepared using the mechanical ball-milling method.It was coated respectively by ammonium perchlorate (AP), lithium perchlorate (LP), and potassium nitrate (KN) to obtain modified multi-metal composite powder fuels (AP@MMP, LP@MMP, and KN@MMP, respectively) by a recrystallization method. The samples were characterized and their thermal oxidation, ignition and combustion processes were investigated through a TG and laser-ignition experiment under Air/H 2 O environments. The results show that the MMP samples can potentially be called pure aluminum substitutes. All three samples exhibit fast ignition characteristics with ignition delay times of 2.95–6.75 ms in air. AP@MMP exhibits the highest ignition speed. The thermal oxidation, ignition, and combustion properties of all samples decayed with increasing water content in the atmosphere (Air→Air+H 2 O→H 2 O). AP@MMP exhibits a significantly more intense and stable combustion overall than LP@MMP and KN@MMP. This study expands the direction and application range of aluminum-based composite metal fuels, guiding their applications in Air/H 2 O environments.
研究领域:
材料科学
·
燃烧学
·
航天工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Hongtu Qiu,Kexin Qu,Jong-Bang Eun,Hua Zhang
Thermal oxidation of different multi-element oleogels (DMEOs) was assessed by measuring the peroxide, p-anisidine, and total antioxidant values. Moreover, a rapid discriminant model for determining oleogel oxidation was established using an electronic nose combined with cluster analysis (CA), principal component analysis (PCA), discriminant factor analysis (DFA), and linear discriminant analysis (LDA). The oxidation degree of the oleogels was sensitive to their gelation temperature. The oleogels prepared with ethyl cellulose showed the highest oxidation value compared with those prepared with β-sitosterol and lecithin, or carnauba wax. Loading resveratrol and adding surfactants can effectively reduce the oxidation of DMEOs. During the thermal oxidation, the DMEOs were sensitive to nitrogen oxides and methane species. The accuracy rates of the discriminant analyses by CA, PCA, DFA, and LDA were 95.00%, 97.25%, 96.25%, and 100%, respectively, which were consistent with that of the American Oil Chemists' Society Official Method.
研究领域:
食品科学
·
分析化学
✓ 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）