PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2023
·Vol. 26
·期 4
·3263-3273
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IF 3.3
Ziwei Zhai,Bofeng Zhang,Yutong Wang,Guozhu Liu
Based on the disturbance of electronic density, nitrogen-doped nanocarbons show promising properties to anchor metal clusters. However, precisely regulating the coordination mode between N species and the active site remains challenging. Herein, we rationally designed three N types (graphitic N, pyridinic N and pyrrolic N) in nanocarbons to anchor Pt clusters for the benchmark propane dehydrogenation. The specific activity of the pyridinic-N-doped catalyst was 147.54 molC3H6 molPt−1 h−1 at 550 °C, which was 1.3 times higher than those of graphitic- and pyrrolic-N-doped catalysts. Unlike the regular tetrahedron Pt cluster in the graphitic-N catalyst or the distorted three-layered Pt cluster in the pyrrolic-N catalyst, the Pt cluster in the pyridinic-N catalyst was an inverted tetrahedron, which increased the contact degree without geometric repulsion towards C–H bond scission. The geometric parameters of detached H and C atoms in the methylene group for the pyridinic N catalyst was decreased to strengthen the C–H bond scission. After CH3CHCH3* adsorption, the Bader charge of the Pt active site also became highly positive, which tailored the d-band center closer to the Fermi level and provided more vacant orbitals for C–H bond breakage. Therefore, pyridinic N in nanocarbons is promising to anchor small-sized Pt for alkane dehydrogenation in terms of geometric and electronic effects.
研究领域:
催化化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Coatings
·
2022
·Vol. 12
·期 10
·1431
·
IF 3.236
Han Yan,Xin Shu,Dongliang Zhou,Yong Yang,Lu Chen,Qianping Ran
The durability of cementitious materials is significant concerning long-term performance. Nanomaterials are promising candidates for deep refinement of cement durability. Hydrophobic calcium carbonate is a widely applied and easily accessible nanomaterial. However, its hydrophobicity and poor dispersity in water prohibit its direct application in cementitious materials. In this study, hydrophobic calcium carbonate nanoparticles (HbCC) were modified using a novel amphiphilic comb-shaped dispersant that is capable of laurinol release. The modification was conducted to improve the dispersity of HbCC and their compatibility with hydration products. The dispersion-improved calcium carbonate particles (AmphCC) were characterized and tested for cement durability improvement performance. According to the results, the AmphCC particles showed a pronounced effect on improving permeation resistance of cement mortars, with water absorption and chloride penetration considerably lowered. Moreover, the introduction of AmphCC in cement did not show significant adverse effects on strength development. Compared with AmphCC, a single addition of the unmodified HbCC and the dispersant cannot achieve equivalent effects. The superior effect of AmphCC is due to the synergistic effect of good particle dispersion and controlled release of the hydrophobic molecules, which is achieved by dispersion of HbCC with binding of the dispersant.Keywords:cement;durability;nano calcium carbonate;amphiphilic dispersant
研究领域:
材料科学
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土木工程
✓ 已验证
产品关联
DOI
高影响因子
ANALYST
·
2023
·Vol. 148
·期 18
·4339-4345
·
IF 4.2
Zhong-Xia Wang,Kai-Qi Liu,Xiang-Ying Meng,Feng Li,Heng-Ye Li,Hang Gao,Wei Wang
Meloxicam (Mel), as a powerful and effective anti-inflammatory drug, is commonly employed for the treatment of various inflammatory diseases; however, the use of Mel at high doses or for extended periods could cause severe side effects in human visceral organs. Therefore, a simple, rapid, and reliable method is urgently needed to monitor Mel in biological samples. Herein, novel water-soluble luminescent nano-carbon dots (nano-Cdots) with outstanding physicochemical properties were prepared by a one-pot high-temperature hydrothermal process of ellagic acid and guanidine. The nano-Cdots were further used as an optical probe for the sensitive detection of Mel in serum samples through the cooperative mechanisms of the inner filter effect and photoelectron transfer. By employing this sensor, an excellent linear correlation was achieved between the relative luminescent intensity [(PL0 − PL)/PL0] and the concentration of Mel in the range of 0.1 to 200 μM, with a limit of detection of 34.68 nM (3σ/k). This sensor was effectively employed for the analysis of Mel in real serum samples, implying its potential development prospects for the advancement of drug analysis with carbon-based probes.
研究领域:
药物分析
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生物化学
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Reports
·
2020
·
IF 3.595
Daolun Liang,Jianzhong Liu,Qili Qiu
Action mechanism of nano titanium carbide (nTiC), nano zirconium carbide (nZrC), and nano silicon carbide (nSiC) was studied using a concentrated ignition experimental system, an X-ray diffractometer and a scanning electron microscope. Each nano-carbide was mixed with B in mass ratio of 2/8 and then pressed into tablets, respectively. Furthermore, a sample of amorphous B was also prepared as the control group. All the three nano-carbides showed positive influence on the ignition of B. During the first stage of combustion, only nTiC could increase the maximum emission spectral intensity of the sample, while both nTiC and nZrC helped to increase that during the second stage of combustion. Although the addition of nano-carbides intensified the energy release rate of B (except nSiC), the expansion and diffusion of generated carbon dioxide took large amounts of heat away and reduced the surface temperature of the samples The temperature change in solid-phase exhibited a relationship with the spectral intensity change in gas-phase. The temperature increase was slow during the ignition delay stage, while the first combustion stage proceeded with rapid increase in surface temperature. The high-temperature areas regressed during the second combustion stage, accompanied by the gradual stopping of gas-phase reactions. The components and microstructure of the condensed combustion products (CCPs) were analyzed after the ignition experiment. Results showed that both nTiC and nZrC could react with B to generate corresponding metal borides, capable of promoting the ignition of B. Moreover, the catalysis of produced TiO 2 and ZrO 2 explain the increase of emission spectral intensity during the second combustion stage. A lot of micropores formed in the CCPs after adding nTiC, which showed a destructive effect of generated gaseous CO 2 on the surface oxide layer. In general, nTiC is the top accelerant for B oxidation in this study, while nSiC is at the bottom.
研究领域:
材料科学
·
燃烧学
✓ 已验证
DOI
高影响因子
Materials Today Nano
·
2021
·
IF 8.109
C. Zeng,K. Wang,L. Pan,B. Li,J. Li,L. Zhou,W. Zhang,C. Liang,H. Pan
Green synthesis of nanocarbons from greenhouse gas CO 2 has been achieved by introducing lithium hydride into CO 2 system. However, the role of lithium hydride in determining the morphology and microstructure of nanocarbons is not revealed. Herein, the morphology and porosity of nanocarbons are found to be related to particle sizes of LiH. Gas blowing velocities of H 2 and CO 2 , increased with the decreasing particle size of LiH, and their distribution are revealed to the most important factors for the morphology and porosity of nanocarbons. The understanding of the roles of lithium hydride in green synthesis of nanocarbons may shed light on the design and large-scale synthesis of nanomaterials with desired morphology and microstructure.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2022
·
IF 5.304
Yilin Wang,Chenxi Wang,Li Zhang,Jiaodi Li,Rongjie Li,Qian Fu,Chunyan Li,Pengcheng Zhao,Yixi Xie,Junjie Fei
Kaempferol (KA), an important polyphenolic compound, is able to combat a variety of inflammatory diseases. Here, a ZnWO 4 / porous nanocarbon based electrochemical sensor has been constructed to detect KA for the first time. Innovatively, ZnWO 4 has been synthesized by pyrolysis using ZIF-8 as a zinc source, while porous nanocarbon was introduced. The nanocomposites have been characterized by X-ray diffraction, X-ray photoelectron spectroscopy and scanning electron microscopy and demonstrated that Acidified ZnWO 4 /porous nanocarbon has been successfully prepared. Notably, the excellent catalytic properties of ZnWO 4 and the great enrichment ability and conductivity of porous nanocarbon greatly enhanced the detection performance of the sensor for KA with a linear range of 0.009–0.7 μM and a LOD of 2.03 nM. In addition, the sensor has obtained satisfactory results for the detection of KA in actual natural samples (broccoli and kaempferia powder). The reaction sites and redox mechanism of KA were shown by density functional theory. Finally, the sensor is highly sensitive and stable, making it a novel detection method with extremely high potential applications.
研究领域:
分析化学
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材料科学
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生物医学
✓ 已验证
产品关联
DOI
高影响因子
CARBON
·
2023
·
IF 10.9
Bin Han,Hanxiang Mu,Jingyi Chen,Xiaodong Hao,Hongyue Wang,Peng Liu,Bingshe Xu,Shufang Ma,Yingjun Yang,Tian Wang,Shukai Ding,Christophe A. Serra,Gaohui Du
Hybrid graphene interdigital electrode-perovskite structure has demonstrated high value in the photodetector (PD) due to high absorbance and carrier collection efficiency. However, direct pattern of graphene film on the dielectric substance still faces huge challenges. Especially, the involvement of multi-step transfer and high-energy etching process hamper its development. In this context, we propose an organic nano carbon source (ONCS). Direct pattern of graphene film on the quartz substrate (GFqtz) is attained by the calcination of patterned ONCS film for the first time, which is simply achieved by screen printing technology thanks to the gel state. The transformation mechanism from ONCS to GFqtz has been proposed. In detail, the ONCS in-situ react with the quartz substrate to induce the SiC nanocrystals layer during the calcination. Then, the graphene film composes of the non-ordered graphene crystal layer and the aligned graphene crystals layer. Finally, the perovskite PD are successfully constructed by the GFqtz interdigital electrode. Compared to the PD fabricated by the Au interdigital electrode, the GFqtz-perovskite PD present an ultra-low detective light power density (0.5 μW/cm 2 ) at 1 V bias voltage. The maximum responsivity and defectivity (0.1 A/W) and D* (2.6 × 10 11 Jones) of the GFqtz-perovskite PD demonstrate an order of magnitude higher than the Au-perovskite PD's value.
研究领域:
材料科学
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光电技术
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Waste and Biomass Valorization
·
2024
·
IF 2.6
Chen Ziqian,Gao Xiaoyan,Zhu Yihui,Deng Yuefeng,Wang Jianjun,Yang Chengli,Hu Kaishun,He Guanya,Li Dali
Food waste cuttlebone has the potential as the raw material of carrier for enzyme immobilization. In this study, we presented a method for synthesizing CaCO 3 nanoparticles coated chitosan (nano-CaCO 3 @chitosan) using cuttlebone as the raw material in the deep eutectic solvent of betaine and urea. The yield of nano-CaCO 3 @chitosan was 89.9%. The nano-CaCO 3 @chitosan was used for immobilization of α-amylase. The yield of enzyme protein was 65.6%. The loading of α-amylase on these nanoparticles was 49.1 mg/g. The optimum reaction conditions of the immobilized α-amylase were 80 °C and pH 4.0. The residual activity of the immobilized α-amylase was 82.9% after reused for 10 cycles. The raw materials for preparing nano-CaCO 3 @chitosan were almost from cuttlebone. The nano-CaCO 3 @chitosan was regarded as reassembly of cuttlebone. Therefore, food waste cuttlebone was utilized as bioresource. Graphical
研究领域:
生物技术
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食品科学
·
酶工程
✓ 已验证
产品关联
DOI
高影响因子
Joule
·
2022
·
IF 46.048
Sunmiao Fang,Jidong Li,Ying Xu,Chun Shen,Wanlin Guo
The conversion of ambient heat into electricity through ubiquitous natural evaporation offers hope for new green energy technologies. So far, evaporation-induced electricity has relied mainly on the classical streaming potential, which is an electric potential generated by driving an electrolyte through a narrow channel under a pressure gradient. Here, we show that evaporation of ethanol from nanostructured carbon films can produce a sustainable volt-level potential in an environment free from the streaming potential, which we term the evaporating potential. This evaporating potential is proven to occur within a narrow partially wetted region ahead of the main capillary film and is directly generated by carrier transfer driven by evaporation of ethanol molecules. It is also shown that other polar solvents can generate potentials comparable to those induced by ethanol. The finding could open a new way to harvest environmental energy through natural processes.
研究领域:
能源科学
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材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL PHYSICS LETTERS
·
2024
·
IF 2.8
Yao Feng,Wenwen Liu,Chaoqun Mu,Lvling Zhong,Zhixian He,Liang Zhang,Juanqin Xue
Several issues plague polymer and calcium carbonate (CaCO 3 ) composites, including the tendency of CaCO 3 particles to aggregate and detach easily, as well as a limited number of adsorption sites. To address the aforementioned issues, a novel large-particle hollow shell-structured PVA-encapsulated nano-CaCO 3 aerogel (PCC) was prepared. The characterization results indicate that the PCC (∼3 mm) possess a three-dimensional network structure with a stereoscopic arrangement of big and small pores. The adsorption of Pb(II) adheres to pseudo-first-order adsorption kinetics and the adsorption equilibrium follows the Langmuir model with a maximum adsorption capacity of 482.85 mg/g at 313 K for Pb(II). The PCC exhibits good selectivity and stability of adsorption towards Pb(II), retaining 92.6 % of its initial adsorption capacity after seven cycles. The large-particle morphology of this material demonstrates significant potential for effectively removing Pb(II) in wastewater treatment applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2019
·
IF 6.97
Hongpo Zhou,Yang Zhou,Juan Xu,Lanxiang Liu,Jinju Ma,Wenwen Zhang,Kun Li,Hong Zhang,Kai Li
We report a feasible and universal approach to fabricate nanocarbon material (NCM) coatings onto a wide range of silicon-based substances. Benefitting from the phenolic hydroxyl and star-shaped branched molecular structure, tannic acid (TA) could act as a functional agent for immobilization and fixation of NCMs in the aqueous phase. More specifically, steered molecular dynamics simulations verified that some unionized chains of TA could tightly attach to the NCM’s surface in the neutral aqueous environment by π–π stacking interactions, and other free arms with ionized phenolic hydroxyl could act as surface charges of the TA/NCM coacervates, resulting in enhanced colloidal stability of this dispersion. Subsequently, these free arms could also interact with the aminated silicon-based substances, enabling TA to act as a “bridge” between the NCM and the silicon-based substances to form the nanocarbon coating. The obtained polydimethylsiloxane with TA/NCM coating represents favorable electrical and thermal conductivity along with excellent electromechanical performance under the cyclic compression-release test. This strategy is a great improvement for the fabrication of NCM layers and devices, which is not necessary to make the hydrophilic modification of NCM and beneficial to enhance the interaction between the carbon layer and substrate, avoiding the coating separation from the substances.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2020
·
IF 0
Xiaofei Hu,Youxuan Ni,Chuanlong Wang,Huan Wang,Edward Matios,Jun Chen,Weiyang Li
Room temperature sodium-sulfur (Na-S) batteries hold great promise as the next-generation cost-effective energy storage systems. However, their practical implementation is still plagued by the low reversible capacity of a bulk-sized commercial sulfur cathode with low Coulombic efficiency and poor cycling stability. Here, we report a highly stable room temperature Na-S battery using a facile-processed, nanocarbon-promoted, bulk-sized commercial sulfur cathode and a polymer electrolyte. This processed nanocarbon possesses a high binding affinity to sulfur and polysulfides, largely facilitating the sulfur reaction kinetics and leading to high reversible capacity. Meanwhile, by applying a thin coating of the facile-processed nanocarbon on the polymer electrolyte, dead sulfur formation can be avoided, contributing to greatly enhanced capacity retention. Our Na-S battery delivers a reversible capacity of >700 mAh g −1 with near-100% Coulombic efficiency and the ultrahigh capacity retention of 98.2% at 0.2C after 200 cycles.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
DOI
危险品化学品经营许可证（带存储）