DIAMOND AND RELATED MATERIALS
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2021
·
IF 3.315
Zhu Liang,Baogang Wang,Mina Luo,Hongsheng Lu
Hexadecylamine modified carbon dots (CDs-HA) were synthesized by pyrolyzing citric acid in HA. The friction-reducing and anti-wear properties of CDs-HA as lubricant additives of polyalphaolefin (PAO4) were evaluated on the universal mechanical tester under the ball-on-disk linear reciprocating model and steel/steel contact. The concentration ( c ) and load both displayed great influences on the tribological properties of CDs-HA. At the load of 20 N and the optimum c of 1 wt%, the friction coefficient and wear volume of PAO4 reduced by 27.1% and 45.9%, respectively. In the load range of 20–100 N, the friction-reducing performance of CDs-HA remarkably decayed with increasing load, whereas their anti-wear property attenuated tenderly. The results of wear scar analyses demonstrated that the CDs-HA as additives not only participated in the formation of boundary lubrication films on the rubbing surfaces, but also should play the rolling, polishing and mending effects, and hence exhibited the outstanding friction-reducing and anti-wear performance.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF POROUS MATERIALS
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2014
·Vol. 21
·期 5
·739-746
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IF 1.316
Guo Li,Zhang Ran,Zhao Xiuge,Gan Huimei,Song Baoning,Chen Jizhong,Zhu Wenwen,Hua Li,Hou Zhenshan
Mesoporous silica materials were prepared by infusion and selective condensation of silicon alkoxides within self-assembly formed from protonated hexadecylamine by CO 2 in aqueous media. Compared to the conventional synthesis approach, the introduction of CO 2 facilitates the hydrolysis of silicon alkoxide precursor and does not need adding any co-solvent in the course of the synthesis of mesoporous material. Moreover, CO 2 can be used as a swelling agent increasing the average pore size form 3.2–5.4 nm with expansion rate of approximately 69 %. The influence of CO 2 pressure and temperature were carefully investigated. During the preparation, nonionic surfactant hexadecylamine can turn into cationic surfactant in situ as mesostructure-directing template under pressurized CO 2 condition, which is the key factor for the formation of ordered mesoporous silica. In addition, the supported Pd catalysts were prepared and characterized thoroughly by X-ray diffraction, 1 H NMR, 13 C NMR, ICP-AES analysis, scanning electron microscopy, transmission electron microscopy and nitrogen adsorption measurements. On the basis of the characterization and hydrogenation performance of the catalysts, the roles of different supports were discussed.
研究领域:
材料科学
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催化
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化学工程
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DOI
高影响因子
ACS Applied Nano Materials
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2019
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IF 0
Guimin Zhang,Ji Feng,Shuai Wang,Bozhe Xu,Wenqiang Ding,Weimin Wang,Zhengyi Fu
This paper reports a seed-mediated growth of Pd@Cu core–shell nanocubes with controllable edge lengths from 49 to 103 nm in an aqueous system using cetyltrimethylammonium bromide (CTAB) capped Pd nanocubes with sizes of 21 nm as seeds. During the growth, ascorbic acid (AA) was served as the reductant and hexadecylamine (HDA) as the capping agent and ligand to form a coordination complex with Cu2+. The edge lengths of Pd@Cu nanocubes could be finely tuned by changing the volume of Pd seeds while maintaining the amount of CuCl2 precursor. Cu atoms initially nucleated on one or two faces of a Pd seed via localized epitaxial growth. Due to the lattice mismatch between Pd and Cu (7.1%), Pd cores were not located in the center of Cu shells during the initial deposition of Cu. Interestingly, most of Pd cores could transfer to the center of Cu nanocubes by dissolving and regrowing of the boundary to decrease the interfacial strain when a sufficient amount of CuCl2 precursor and reaction time were provided. The Pd@Cu nanocubes exhibited strong LSPR signals and long-term stability which could be a low-cost potential substitute for Au and Ag for applications in sensing, surface-enhanced spectroscopy, optoelectronics, and photocatalysis. By comparison of the rate constant of p-nitrophenol reduction reaction over Pd@Cu nanocubes with different sizes as catalyst, 83 nm Pd@Cu nanocubes showed the highest catalytic activity.
研究领域:
材料科学
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纳米技术
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催化
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化学工程
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产品关联
DOI
Surfaces and Interfaces
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2024
·
IF 5.7
Lu Yang,Xi Chen,Jingxiang Zhang,Haoliang Zhang,Qiuying Zhao,Haiyan He,Huajie Huang,Yanjie Wang
High-efficient and recyclable piezo-photocatalysts are garnering substantial attention in line with the advancements in environmental purification. Herein, a novel micropatterned piezo-photocatalytic composite film, wherein BaTiO 3 @TiO 2 core-shell nanoparticles are embedded within porous poly(vinylidene fluoride) matrix, is developed. The impressive synergy between photocatalytic and dual piezocatalytic effects emanating from integrated components contributes to significantly amplified piezo-photocatalysis process. Moreover, by modulating the geometric structure of nanofiller along with topographical pattern design, one can further harness the piezo-photocatalysis effect upon electrical poling. As a result, the newly-developed composite film exhibits distinguished piezophotocatalytic activity, i.e., the degradation efficiency of highly-concentrated Methyl Orange (MO) solution (C 0 = 10 mg/L, 100 mL) reaches 97.3 % within 90 min, implying its viability as high-performance piezo-photocatalysts.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
NATURE
·
2024
·Vol. 630
·期 8017
·643-647
·
IF 50.5
Zhang Qiubo,Song Zhigang,Sun Xianhu,Liu Yang,Wan Jiawei,Betzler Sophia B.,Zheng Qi,Shangguan Junyi,Bustillo Karen C.,Ercius Peter,Narang Prineha,Huang Yu,Zheng Haimei
Electrified solid–liquid interfaces (ESLIs) play a key role in various electrochemical processes relevant to energy 1 , 2 , 3 , 4 , 5 , biology 6 and geochemistry 7 . The electron and mass transport at the electrified interfaces may result in structural modifications that markedly influence the reaction pathways. For example, electrocatalyst surface restructuring during reactions can substantially affect the catalysis mechanisms and reaction products 1 , 2 , 3 . Despite its importance, direct probing the atomic dynamics of solid–liquid interfaces under electric biasing is challenging owing to the nature of being buried in liquid electrolytes and the limited spatial resolution of current techniques for in situ imaging through liquids. Here, with our development of advanced polymer electrochemical liquid cells for transmission electron microscopy (TEM), we are able to directly monitor the atomic dynamics of ESLIs during copper (Cu)-catalysed CO 2 electroreduction reactions (CO 2 ERs). Our observation reveals a fluctuating liquid-like amorphous interphase. It undergoes reversible crystalline–amorphous structural transformations and flows along the electrified Cu surface, thus mediating the crystalline Cu surface restructuring and mass loss through the interphase layer. The combination of real-time observation and theoretical calculations unveils an amorphization-mediated restructuring mechanism resulting from charge-activated surface reactions with the electrolyte. Our results open many opportunities to explore the atomic dynamics and its impact in broad systems involving ESLIs by taking advantage of the in situ imaging capability.
研究领域:
材料科学
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电化学
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显微技术
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
·
IF 13.3
Hanchen Lin,Like Ning,Tingting Dai,Wei Wei,Ning Ma,Mei Hong,Fei Wang,Chaoqun You
The Pine wood nematode disease is a significant biological threat to forestry management and ecological restoration worldwide, with chemical control remaining the primary approach. However, the cryptic nature of pine wood nematodes (PWN) limits the effectiveness of conventional pesticides. This study explores the development of a cellulose network carrier-based nanopesticide (Se@CSM/PDA@AZO-CNF) loaded with selenium nanoparticles, offering dual responsiveness to light and temperature. This innovative design enables the precise release of pesticides under natural conditions, supporting a controlled response. Incorporating selenium nanoparticles into the cellulose-based nanopesticide improved pesticide permeability and deposition in pine trees. The contact angle of pesticides on pine needles decreased by 23°, their resistance to washing increased by 39 %, and cumulative release was significantly enhanced under UV light and low temperatures. Fluorescence tracer experiments demonstrated efficient uptake of Se@CSM/PDA@AZO-CNF nanopesticide by PWN. The hydrogel displayed an LC 50 value of 29.1 mg/L against PWN. These findings highlight the potential of this nanopesticide to improve pesticide delivery and efficacy in controlling pine wood nematode disease.
研究领域:
林业管理
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线虫学
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材料科学
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环境科学
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DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Jiaqi Xu,Yuchen Wang,Mengxuan Zhu,Rui Wang,Heng Jiang,Dechen Bo,Changzi Jin,Xin Liu
Hollow carbonaceous spheres are extraordinarily attractive for their unique structural features and wide applications in various fields. Herein, a facile and effective synthesis methodology based on the extended Stöber process for construction of phenolic resin hollow spheres has been presented. Combined with a series of characterization techniques, the synthesis process was systematically investigated, and a possible synthesis mechanism was proposed. It is revealed that the structural inhomogeneity of the polymer product achieved by using dodecylamine and alkane is responsible for the formation of hollow architecture, which depends on spontaneous selective dissolution during the synthesis process. Different metal-doped carbonaceous hollow spheres can be obtained by introducing corresponding precursors into the synthetic system and meeting requirements of different application fields. This work presented a novel synthesis strategy of hollow carbonaceous spheres, which is significant for building a new platform of advanced functional carbon-based composites.
研究领域:
材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2024
·
IF 3.8
Zhang Shuang,Jiang Yunhao,Lei Wenli,Zhai Yueming,Liu Juejing,Lyu Xingyi,Li Tao,Guo Xiaofeng,Zhao Yuanmeng,Shan Changsheng,Niu Li
The development of cost-effective and highly efficient electrocatalysts is critical to help electrochemical non-enzymatic sensors achieve high performance. Here, a new class of catalyst, Ru single atoms confined on Cu nanotubes as a single-atom alloy (Ru 1 Cu NTs), with a unique electronic structure and property, was developed to construct a novel electrochemical non-enzymatic glucose sensor for the first time. The Ru 1 Cu NTs with a diameter of about 24.0 nm showed a much lower oxidation potential (0.38 V) and 9.0-fold higher response (66.5 μA) current than Cu nanowires (Cu NWs, oxidation potential 0.47 V and current 7.4 μA) for glucose electrocatalysis. Moreover, as an electrochemical non-enzymatic glucose sensor, Ru 1 Cu NTs not only exhibited twofold higher sensitivity (54.9 μA mM −1 cm −2 ) and wider linear range (0.5–8 mM) than Cu NWs, but also showed a low detection limit (5.0 μM), excellent selectivity, and great stability. According to theoretical calculation results, the outstanding catalytic and sensing performance of Ru 1 Cu NTs could be ascribed to the upshift of the d-band center that helped promote glucose adsorption. This work presents a new avenue for developing highly active catalysts for electrochemical non-enzymatic sensors. Graphical Abstract
研究领域:
材料科学
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分析化学
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电催化
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DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 9
·4175-4183
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IF 2.7
Rong Wang,Jin Li,Jia-Jia Chen,Yu Guo,Yue Hu,Xiao-Qi Yu,Ji Zhang
Lipid nanoparticles (LNPs) are the most advanced non-viral platform for nucleic acid delivery, holding enormous potential applications in clinical therapy. However, some shortcomings remain, such as complex synthetic routes, low synthetic yield, and high cost. In this study, a series of lipid molecules with different cationic headgroups and hydrophobic tails were designed and prepared via Passerini reaction, which provided a convenient multi-component one-step synthetic process toward the lipid molecules with variable product structures for structure–activity relationship studies. The LNPs formed from these lipids could compress DNA efficiently and form stable lipoplexes with low cytotoxicity. The gene transfection efficiency was largely affected by the lipid structure including the cationic headgroup and hydrophobic tails. The lipids A3 with equal C14 length tails could induce the highest transfection efficiency, which was up to 25 times higher than Lipo 2000. Compared to the commercial transfection reagent, the efficiency of target LNPs was less negatively affected by serum. Mechanism studies by confocal microscopy and flow cytometry revealed that lipids with equal C14 length tails led to more efficient cellular uptake, which might contribute to their higher transfection efficiency. This study provides a new strategy for the construction of cationic lipid gene vectors for non-viral gene delivery by multi-component Passerini reaction.
研究领域:
生物化学
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分子生物学
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药物递送系统
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DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Cheng Chen,Haoyue Liu,Yutong Wang,Zhiwei Zhang,Yifan Jing,Lixia Jia,Yuanshu Xiao,Guohua Shan,Li Jiang
Carbon nanotubes, carbon nanospheres, long-chain alkyl amine, pentaerythritol-containing compound and branched amino polymer were mixed in ethanol medium without heat; by utilizing the in-situ growth of nanoscale low surface energy granules onto carbon matrix surface via the room-temperature reaction between acrylate-comprising reactant and amino substance, whereafter the hierarchical structural assembly was formed, the carbon nanotubes-based nonfluorinated superlyophobic paint was constructed in the one-pot spontaneous condition. Well-suited spraying technology was used for fixation of as-prepared superwetting paint on cotton textile to create fluoride-free hot-water-repellent cotton fabric coating, its contact angle and sliding angle were 155.0° and 2° tested by 95°C of water. Furthermore, the anti-fouling effect of such coated fabric to 95°C sewage and self-cleaning behavior, by dripping 95°C water onto coating product, were adequately established. Notably, universally applicable fabrication and large-scale formation of the hot-water-repellent coating were also realized, thereinto these coating surfaces of apocynum fabric, glass sheet, cardboard, plastic sheet, cork board and sponge, sprayed by the carbon nanotubes-based superwetting paint, had contact angles over 158° as well as 1° of sliding angles (tested water temperature, 95°C). Beyond that, the cellulose sheet coating, obtained using same strategy as mentioned above, could separate mixture of oil and hot water (55°C), meanwhile its oil-hot water separation flux and efficiency were 9370 L·m −2 ·h −1 and 99.7 %. It is believed that the self-developed carbon nanotubes-based nonfluorinated superwetting special paint product provides robust hot-water-repellent coating that is beneficial to the low-carbon development of hot liquid resistant surfaces with easy operability, environmental sustainability, and durable application.
研究领域:
材料科学
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环境科学
·
化学工程
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产品关联
DOI
高影响因子
ACS Nanoscience Au
·
2024
·
IF 4.8
Dan Luo,Zhiheng Xie,Shuangqun Chen,Tianyi Yang,Yalin Guo,Ying Liu,Zhouhao Zhu,Liyong Gan,Lingmei Liu,Jianfeng Huang
Electrochemical semihydrogenation (ESH) of alkynes to alkenes is an appealing technique for producing pharmaceutical precursors and polymer monomers, while also preventing catalyst poisoning by alkyne impurities. Cu is recognized as a cost-effective and highly selective catalyst for ESH, whereas its activity is somewhat limited. Here, from a mechanistic standpoint, we hypothesize that electron-deficient Cu can enhance ESH activity by promoting the rate-determining step of alkene desorption. We test this hypothesis by utilizing Cu–Ag hybrids as electrocatalysts, developed through a welding process of Ag nanoparticles with Cu nanowires. Our findings reveal that these rationally engineered Cu–Ag hybrids exhibit a notable enhancement (2–4 times greater) in alkyne conversion rates compared to isolated Ag NPs or Cu NWs, while maintaining over 99% selectivity for alkene products. Through a combination of operando and computational studies, we verify that the electron-depleted Cu sites, resulting from electron transfer between Ag nanoparticles and Cu nanowires, effectively weaken the adsorption of alkenes, thereby substantially boosting ESH activity. This work not only provides mechanistic insights into ESH but also stimulates compelling strategies involving hybridizing distinct metals to optimize ESH activity.
研究领域:
化学工程
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电催化
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材料科学
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产品关联
DOI
PubMed
高影响因子
CELLULOSE
·
2024
·
IF 4.9
Zheng Jiaojiao,Cao Tianyu,Wang Jianxiao,Xu Wenhao,Qu Yihan,Wang Jiafen,Wu Yunlong,Song Yanyan,He Lizhong,Chen Xudong,Yang Jie,Qu Yinhu
Engineering the active layer of pressure sensors with micro-nano structures is increasingly important in improving their sensing properties, such as sensitivity and detection range. However, existing structures based on template methods continue to face manufacturing challenges and uncontrolled structures, making it difficult to optimize sensing performance. To address the aforementioned shortcomings, this study proposes highly tunable metallic silver copper micro-nano structures adapted on cotton fabric (AgCu/cotton) to adjust the interfacial contact sites and optimize the sensing properties. The shape, size, and distribution of the metallic AgCu nano structures are precisely regulated, and various distinctive morphologies including two-dimensional (2D) nanosheet stacking, three-dimensional (3D) irregular protrusions, and nanoparticle aggregation were obtained. Specifically, the 3D irregular protrusions of varying heights and shapes (nanosheets, nanoparticles, and so on), encouraging multiple deformations and enhanced interfacial contact sites. On the other hand, the hierarchical porous structure of cotton fabric enhances structural compressibility. Collectively, the synergistic results of the 3D irregular protrusions and the hierarchical porous structure allow for a high sensitivity (115.65 kPa −1 ), a quick response time (500 ms), and outstanding stability (2000 cycles). The above sensing properties enable the pressure sensor to be successfully applied in joint movement detection and swallowing recognition. The discovery could pave the way for a more cost-effective and widespread approach to a controlled and improved piezoresistive pressure sensor. Graphical abstract We herein develop a highly morphology-controlled AgCu/cotton flexible pressure sensor with an economical strategy toward superior sensing performance. Such regulated morphology is responsible for optimized contact sites and structural deformation, resulting in a high sensitivity of 115.65 kPa −1 over 2–7.5 kPa, and showing great potential in various human motion detections.
研究领域:
材料科学
·
传感器技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）