INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Bowen Luo,Rongxuan Li,Riyang Shu,Chao Wang,Jingtao Zhang,Ying Chen
Simple and efficient catalytic routes have been explored to upgrade the raw lignin oil. Though homogeneous catalysis is easy to operate and possesses a high reaction rate, it also suffers from the difficulty of product separation. In this work, we used H3BO3 as a novel homogeneous catalyst coupled with Ru/C to overcome the separation problem and carry out the hydrodeoxygenation (HDO) of phenolic compounds and raw lignin oil. H3BO3 showed an outstanding performance over the liquid organic and mineral acids, with a good catalyst recyclability. Phenolic model compounds including monomers and dimers can be efficiently converted into cycloalkanes with yields close to 100%. Moreover, the raw lignin oil also had a good HDO result by using this bifunctional catalyst (H3BO3 and Ru/C). The content of hydrocarbons increased from 7.9% to 93.1% at 260 °C, which promoted the upgraded lignin oil capable to be used as fuel directly.
研究领域:
化学工程
·
可再生能源
✓ 已验证
DOI
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2025
·
IF 13.1
Haochuan Wang,Xin Liu,Chong Wang,Wei Wang,Jinxiang Hong,Pan Feng
Ultra-early mechanical properties are critical for shotcrete performance, significantly influenced by ettringite and calcium silicate hydrate (C-S-H) formed during the initial hydration stage and free water. This study investigates the individual and synergistic effects of these phases on mechanical behavior using equivalent cement pastes. In this system, cement was entirely replaced with dolomite particles of matching size distribution, with the controlled introduction of free water, ettringite, and C-S-H. The validity of these equivalent systems was confirmed through comprehensive characterization. Mechanical performance was subsequently evaluated using compression, shear, Vickers hardness and nanoindentation tests. Results revealed that free water remarkably weakened the mechanical properties, whereas both ettringite and C-S-H enhanced strength by reducing voids and reinforcing weak particle interfaces. Ettringite primarily contributed to interparticle friction, while C-S-H enhanced cohesion at interfaces including dolomite-dolomite, dolomite-ettringite and ettringite-ettringite contacts. When co-existing, C-S-H formed within the porous ettringite network, not only establishing a multi-scale filling structure but also stabilizing the dolomite-ettringite skeleton. These findings advance our understanding of the early-age mechanical development of shotcrete and highlight the potential of equivalent cement systems as robust tools for research into cementitious materials.
研究领域:
土木工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 148
·期 11
·3445-3453
·
IF 2.911
Li Xia,Dong Hao,Wang Bo,Lv Jun,Xu Guangqing,Wang Dongmei,Wu Yucheng
Firstly, h-CdS/c-CdS homojunction was prepared by solvothermal method with controlling the Cd-to-S molar ratio. Then, the MoS 2 /h-CdS/c-CdS nanocomposites were constructed by ultrasonic method with different MoS 2 amount. The experimental results showed that when the molar ratio of Cd and S was 1:1 and the amount of MoS 2 was 1.5 wt%, the MoS 2 /h-CdS/c-CdS nanocomposites exhibited excellent photocatalytic performance for hydrogen evolution under visible light. The total amount of hydrogen evolution was 3753.12 µmol for 5 h, and its average hydrogen evolution rate was 40.79 mmol h −1 g −1 with an apparent quantum efficiency of 38.16% irradiated at 420 nm, which was about 7.3 times when compared with the h-CdS/c-CdS homojunction (Cd:S = 1:8). The enhanced photocatalytic performance of MoS 2 /h-CdS/c-CdS could be attributed to the improved specific surface area and formation of well bonded interface structure, which not only enhanced the response to visible light but also decreased the recombination rates of photogenerated charge carriers. Graphical Abstract
研究领域:
材料科学
·
光催化
✓ 已验证
DOI
高影响因子
CEMENT AND CONCRETE RESEARCH
·
2024
·
IF 10.9
Binmeng Chen,Xu Fang,Yuyang Zhao,Zongjin Li
In recycling and reusing construction waste, carbonation of recycled concrete fine (RCF) has been successfully applied to produce value-added products, such as silica nanoparticles, via the breaking of calcium silicate hydrate (C-S-H) structure and condensation of silicate chains. However, the intricacies of carbonation of RCF with varying calcium to silicon (C/S) ratios and their implications on the size of generated silica nanoparticles remain unknown. In this work, we developed an optimized carbonation method at high water to solid ratio to fabricate silica nanoparticles from C-S-H with different C/S ratios. The particle size of silica nanoparticles was found to gradually decrease with the increased C/S ratio of C-S-H. Since as C/S ratio increased, silicate in Q 3 state shifted to Q 1 state and the silicate chain became shorter, shifting from long-range, disordered to short-range, ordered. As the disordered self-seeding growth of long silicate chains derived from C-S-H continued, the Si-O-Si network of silica nanoparticles became chaotic, leaving more unreacted Si-OH on its surface. On the contrary, the short silicate chains displayed higher possibility of condensation, making nanoparticles with a smaller diameter.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Sensor Letters
·
2016
·Vol. 14
·期 9
·859-863
·
IF 0
Ding Yu,Li Yibin,Wu Huimin,Wang Shengfu,Xia Qinghua
20 wt% PtFe/C catalysts were prepared by a chemical reduction method at high temperature. The catalysts were characterized by X-ray diffraction, transmission electron microscopy, and electrochemical testing. The sensor based on PtFe/C showed a detection limit of 0.03 mM and high
sensitivity with linear range from 0.1 mM to 13.5 mM. The sensor still had high selection for glucose in the presence of commonly interfering species, such as ascorbic acid, acetamidophenol, and uric acid. The as-prepared glucose sensor has good anti-interference performance.
研究领域:
材料科学
·
电化学
·
生物传感
✓ 已验证
DOI
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Wei Ji,Guofeng Liu,Zijian Li,Chuanliang Feng
For CH···O hydrogen bonds in assembled structures and the applications, one of the critical issues is how molecular spatial structures affect their interaction modes as well as how to translate the different modes into the macroscopic properties of materials. Herein, coumarin-derived isomeric hydrogelators with different spatial structures are synthesized, where only nitrogen atoms locate at the ortho, meso, or para position in the pyridine ring. The gelators can self-assemble into single crystals and nanofibrous networks through CH···O interactions, which are greatly influenced by nitrogen spatial positions in the pyridine ring, leading to the different self-assembly mechanisms, packing modes, and properties of the nanofibrous networks. Typically, different cell proliferation rates are obtained on the different CH···O bonds driving nanofibrous structures, implying that tiny variation of the stereo-position of nitrogen atoms can be sensitively detected by cells. The study paves a novel way to investigate the influence of isomeric molecular assembly on macroscopic properties and functions of materials.
研究领域:
材料科学
·
生物学
·
医学
✓ 已验证
DOI
PubMed
高影响因子
Materials Today Communications
·
2025
·
IF 4.5
Jiao Liu,Jinhu Hu,Xukang Han,Zhenyu Sheng,Yonglei Chi,Fangjiang Chi,Mingliang Ma
The rapid expansion of 5 G technology and the proliferation of electronic devices have exacerbated electromagnetic radiation pollution of urban building space and pose significant risks to human health, necessitating the development of efficient electromagnetic wave (EMW) absorbing materials for use in buildings to address this challenge. Carbon nanotubes (CNT) and magnetic materials such as Fe are widely used in this field due to their unique electromagnetic properties. In this study, γ-Fe 2 O 3 /C/CNT magnetic nanofibers were successfully prepared, exhibiting synergistic di-electric and magnetic capabilities through electrospinning and mechanical blending methods. Compared to γ-Fe 2 O 3 /C fibers and CNT, the CNT-modified composite material exhibited superior EMW absorption performance. At a low loading of 15 wt %, the γ-Fe 2 O 3 /C/CNT composite fibers achieved a minimum reflection loss (RL min ) of -78.89 dB (2.61 mm) and an effective absorption bandwidth (EAB) of 4.12 GHz (1.52 mm, 13.6-17.72 GHz). The superior EMW absorbing performance is primarily attributed to the three-dimensional network structure created by the intertwined nanofibers and CNT, through the synergy of two one-dimensional structures, which achieved good impedance matching and multiple loss mechanisms. As high-efficiency absorbing agents, γ-Fe 2 O 3 /C/CNT magnetic nanocomposite fibers have broad application prospects, serving as low-loading polymer coatings and cement-based materials absorbent to absorb radiation from electronic devices within buildings, reducing indoor electromagnetic pollution, and they can also be used in the field of military stealth. This work provides new insights into the development of efficient EMW absorbing materials.
研究领域:
材料科学
·
环境科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 15
·14573-14579
·
IF 2.195
Teng Zhen,Zeng Sifan,Feng Wanlin,Zhu Lini,Tan Yongqiang,Han Xiaochun,Chen Chen,Zhang Haibin
Fe-Fe 3 C@C composites are successfully synthesized via a facile pyrolysis process. Experimental results indicate that Fe-Fe 3 C nanoparticles are closely parceled among amorphous carbon and exhibit a core–shell structure. The obtained materials display excellent microwave absorption performance with an optimal reflection loss of − 35.6 dB at 17.2 GHz, and an effective absorbing bandwidth of 4 GHz (from 12.4 to 16.4 GHz) with the coating thickness of 2 mm. The magnetic loss derived from Fe core and dielectric loss on carbon materials as well as a good impedance matching are believed to play decisive roles for this favorable microwave absorbing properties. The composites are considered to be good candidates for microwave absorption applications.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
DRUG DEVELOPMENT AND INDUSTRIAL PHARMACY
·
2015
·
IF 2.101
Xiu-Rong Zhang,Nian-Qiu Shi,Yang Zhao,He-Yun Zhu,Jiao Guan,Ying Jin
Mitomycin C (MTC) was incorporated to a micelle system preparing from a polymer named deoxycholic acid chitosan-grafted poly(ethylene glycol) methyl ether (mPEG-CS-DA). mPEG-CS-DA was synthesized and characterized by 1H nuclear magnetic resonance (1H-NMR) and Fourier transform infrared spectroscopy. mPEG-CS-DA formed a core-shell micellar structure with a critical micelle concentration of 6.57 µg/mL. The mPEG-CS-DA micelles were spherical with a hydrodynamic diameter of about 231 nm. After poly(ethylene glycol)ylation of deoxycholic acid chitosan (CS-DA), the encapsulation efficiency and drug loading efficiency increased from 50.62% to 56.42% and from 20.51% to 24.13%, respectively. The mPEG-CS-DA micelles possessed a higher drug release rate than the CS-DA micelles. For pharmacokinetics, the area under the curve (AUC) of the mPEG-CS-DA micelles was 1.5 times higher than that of MTC injection, and these micelles can enhance the bioavailability of MTC. mPEG-CS-DA micelles reduced the distribution of MTC in almost all normal tissues and had the potential to improve the kidney toxicity caused by MTC injection.
研究领域:
药剂学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2024
·
IF 4.4
Diwei Deng,Ping Ma,Xianliang Li,Xiaoyu Chen,Yan Xu
Metal oxide heterostructures have been demonstrated excellent candidates acting as novel gas sensors with outstanding sensitivity and selectivity . In this work, a hierarchical NiGa 2 O 4 @C@CeO 2 heterostructure with corn-like NiGa 2 O 4 microcrystals covered by a thin carbon layer and then anchored with numerous amounts of external CeO 2 nanoparticles was prepared through the combination of hydrothermal and a subsequent calcination method. The NiGa 2 O 4 @C@CeO 2 composite demonstrates an excellent selective triethylamine (TEA) detection performance with a response of 11.1 towards 20 ppm TEA and a fast response/recovery time of 81 s/38 s. It also shows terrific selectivity for TEA when mixed with else interfering substances, along with prolonged reusability for at least 15 days. The enhanced TEA sensing performance can be ascribed to the significant improvement of conductivity and effective carrier transfer at the interface. This work provides a feasible method to fabricate metal oxide sensors with improved gas sensing performance.
研究领域:
材料科学
·
化学传感器
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
TRANSPLANTATION
·
2005
·Vol. 80
·期 8
·1003
·
IF 3.568
Sweet Ian R.,Gilbert Merle,Jensen Rich,Sabek Omaima,Fraga Daniel W.,Gaber Ahmed O.,Reems JoAnna
Background. An in vitro method to assess human islets could prevent transplantation of nonviable islets and facilitate the optimization of islet preparation. We hypothesize that glucose-stimulated cytochrome c reduction and oxygen consumption by human islets can be used as predictors of transplant success. Methods. Isolated human islets were obtained from research-grade pancreata. Using a previously developed islet flow culture system, the response of cytochrome c reduction and oxygen consumption to glucose was compared to the ability of islets transplanted into nondiabetic NOD-SCID mice to secrete C-peptide in response to a glucose tolerance test conducted 7 days following transplant (n=10). Results. In vitro responses by human islets were qualitatively similar to those seen in rat islets: glucose increased both oxygen consumption and cytochrome c reduction. However, the responses were smaller in magnitude and quite variable. Scatter plots of C-peptide and quantiles for ln(C-peptide) indicated that 12 ng/ml could be used as threshold of transplant success with which to evaluate the diagnostic potential of cytochrome c and oxygen consumption. Data was analyzed by generating receiver operating curves and the area under the curve was 0.889 (95% CI: 0.645–1.000) and 0.738 (95% CI: 0.413–1.000) for cytochrome c reuction and oxygen consumption respectively (1 indicates absolute predictive capability and 0.5 indicates no predictive capability). Conclusions. The detection of glucose-stimulated cytochrome c reduction and oxygen consumption may have utility as criteria for the assessment of human islet quality.
研究领域:
生物医学工程
·
内分泌学
✓ 已验证
DOI
PubMed
高影响因子
Current Research in Food Science
·
2025
·
IF 7
Le Cheng,Haoyue Bai,Mingfang Zhang,Fengping Yang,Difeng Ren,Yunpeng Du
The emerging technology of inhibiting polyphenol oxidase (PPO) is crucial for preventing enzymatic browning in food. This study aimed to investigate the effects of 4.5 kJ/m 2 ultraviolet (UV)-C radiation and 0.02 mg/mL L-cysteine (L-cys) treatment on the enzyme activity, physico-chemical properties, thermal properties, structure, and molecular microstructure of PPO. UV-C/L-cys decreased PPO activity and had the highest aggregation index and turbidity of PPO. UV-C/L-cys further reduced the denaturation temperature point and increased the denaturation enthalpy of PPO. UV-C/L-cys turned the α-helix to random coil of PPO and destroyed the tertiary structure. This combined treatment aggregated the microstructure of PPO, which led to covering the active center of the enzyme, leading to its inactivation. Molecular docking simulation confirmed that L-cys bound to PPO through hydrogen bonding and ionic contact. This study established a foundation for the application of UV-C radiation and L-cys treatment to control food browning.
研究领域:
食品科学
·
生物化学
✓ 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）