JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
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IF 8.128
Lixia Ma,Le Wang,Yingjie Guo,Zhongke Wang,Hang Yin,Ruibin Jiang
Graphitic carbon nitride (CN) generally needs to be exfoliated into ultrathin nanosheets to reduce photocarrier recombination. However, the exfoliation of CN into nanosheets also reduces the light absorption. How to simultaneously realize low photocarrier recombination and high light absorption remains a challenge in the practical application of CN in photocatalysis. Herein, the light absorption of CN nanosheets was enhanced by introducing hollow TiO 2 (h-TiO 2 ) dielectric resonators. The h-TiO 2 /CN heterostructures were prepared by thermally polymerizing dicyandiamide in the presence of h-TiO 2 . The electromagnetic resonances of the h-TiO 2 resonator creates strong electric field enhancement within, inside, and near external surface of the introduced h-TiO 2 nanoshells. The enhanced electric field greatly improves the light absorption of CN located in these regions. The largest hydrogen evolution rate for h-TiO 2 /CN can reach 6.3 mmol g −1 h −1 , which is over 3-fold that of pure CN (2.0 mmol g −1 h −1 ). It is also found that the small amount of CN within and inside h-TiO 2 majorly contributes to the photocatalytic performance. These findings open a new avenue by which to enhance the performance of photocatalysts and will be helpful in the design of highly efficient photocatalysts for various reactions.
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ACS Applied Materials & Interfaces
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2021
·
IF 9.229
Yeguang Zhang,Yong Qi,Rongzi Wang,Tun Cao,Wei Ma,Shufen Zhang
Responsive photonic crystals (PCs), which can adjust structural colors in response to external stimuli, show great potential applications in displays, sensors, wearable electronics, encryption, and anticounterfeiting. In contrast, conventional structure-intrusive adjustment manners that external stimuli directly interact with the ordered arrays may lead to structural damage or longer response time. Here, a noninvasive adjustment of the structural colors of two-dimensional (2D) PCs (2D-PCs) is explored based upon diffraction theory. Sealed 2D-PCs and 2D inverse opal photonic crystal (IOPC) flexible devices are prepared. They are highly transparent in air but immediately exhibit intense viewing angle-dependent structural colors after being dipped in water. The mechanism of transparent-iridescent immediate transformation is explained by Bragg’s law. The design mechanism is examined by numerical simulation and spectral shifts in different external media. We demonstrate its applications in the fields of information encryption and anticounterfeiting by using the transparent-iridescent immediate transformation of sealed 2D-PC patterns and 2D IOPC free-standing films sealed on the product surface. Because of the strong contrast between transparency and intense iridescence, reversible and immediate transformation, and durability, sealed 2D-PCs and 2D IOPC flexible devices designed by the noninvasive adjustment strategy will lead to a variety of new applications in displays, sensors, wearable electronics, encryption, and anticounterfeiting.
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SOLAR ENERGY MATERIALS AND SOLAR CELLS
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2021
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IF 7.267
Xiaoyin Cao,Shujuan Wu,Lijuan Yang,Jie Cui,Chengjun Wang,An Li
The construction of high-performance materials with superior light-to-thermal conversion efficiency is of great importance for harvesting and utilization of solar energy. Hence, we report the creation of novel composite phase change materials (CPCMs) CPCMs by incorporating three kinds of organic phase change materials (PCMs), i.e. 1-Tetradecylamine (TDA), 1-hexadecanamine (HDA) and Octadecylamine (ODA), into hollow carbon nanospheres (HCNS) via a simple impregnation treatment for efficient light-to-thermal transition. Owing to their carbon in nature, the HCNS show better light absorption of higher than 90%. After incorporation of organic PCMs, their light absorption could still attain 62–70%, which can compete with the existing CPCMs. Beneficial from their abundant porosity and high specific surface areas, organic PCMs can be spontaneously diffused and immersed into the porous architecture of HCNS. In this way, the as-resulted CPCMs containing with TDA, HDA and ODA show high phase change enthalpy of 61.23J/g, 119.5J/g and 101.8J/g, respectively. The CPCMs also exhibit better thermal conductivity and excellent thermal stability, e.g., the enthalpy of HAD based CPCMs remains nearly unchanged even after 100 times of melting/freezing cycles. Under 1 sun irradiation, the light-to-thermal conversion efficiency of CPCMs containing with TDA, HDA and ODA were measured to be 73.04%, 74.46% and 71.74%, respectively, Thus showing great potential as a kind of promising photothermal conversion devices for solar or thermal energy storage applications.
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BIOORGANIC CHEMISTRY
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2020
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IF 4.831
Huan Li,Shuang Fu,Yudan Wang,Xuan Yuan,Lijia Liu,Hongxing Dong,Qiang Wang,Zhijia Zhang
Thirteen cationic peptidomimetics derived from amino acids bearing an alkyl or ethynylphenyl moiety that mimic the structure of cationic antibacterial peptides were designed and synthesized using a simple coupling reaction of an amino acid with a substituted amine. Antibacterial activities of the resulting peptidomimetics against drug-sensitive bacteria, such as Gram-positive Staphylococcus aureus ( S. aureus ) and Bacillus subtilis , Gram-negative Escherichia coli ( E. coli ) and Salmonella enterica , and a drug-resistant bacterium, methicillin-resistant S. aureus (MRSA), were systematically evaluated. Most peptidomimetics show significant broad-spectrum antibacterial activity. A-L-Iso-C 12 (isoleucine derivative bearing a dodecyl moiety) show MICs of 2.5 μg/mL against S. aureus and 4 μg/mL against MRSA and A-L-Val-C 12 (valine derivative bearing a dodecyl moiety) show MICs of 1.67 μg/mL against E. coli and 8.3 μg/mL against MRSA. A-L-Val-C 12 showed low cytotoxicity toward L929 cells in comparison with SGC 7901 cells, indicating tumor-directed killing by peptidomimetics while avoiding toxicity to normal cells. The influences of type of amino acid and substituent, length of substituent, and stereochemistry of amino acids on antibacterial activity and cytotoxicity of peptidomimetics were systematically investigated. The results indicate that this series of cationic peptidomimetics derived from amino acids display antitumor activity and may be useful for treatment of bacterial infections.
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DIAMOND AND RELATED MATERIALS
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2021
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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.
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Nanomaterials
·
2020
·Vol. 10
·期 11
·2207
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IF 4.324
Wan-Cheng Zhang,Meng-Dai Luoshan,Peng-Fei Wang,Chu-Yun Huang,Qu-Quan Wang,Si-Jing Ding,Li Zhou
The self-assembly process of metal nanoparticles has aroused wide attention due to its low cost and simplicity. However, most of the recently reported self-assembly systems only involve two or fewer metals. Herein, we first report a successful synthesis of self-assembled Ag@AuCu trimetal nanoplates in aqueous solution. The building blocks of multibranched AuCu alloy nanocrystals were first synthesized by a chemical reduction method. The growth of Ag onto the AuCu nanocrystals in the presence of hexadecyltrimethylammonium chloride (CTAC) induces a self-assembly process and formation of Ag@AuCu trimetal nanoplates. These nanoplates with an average side length of over 2 μm show a porous morphology and a very clear boundary with the branches of the as-prepared AuCu alloy nanocrystals extending out. The shape and density of the Ag@AuCu trimetal nanoplates can be controlled by changing the reaction time and the concentration of silver nitrate. The as-assembled Ag@AuCu nanoplates are expected to have the potential for wide-ranging applications in surface-enhanced Raman scattering (SERS) and catalysis owing to their unique structures.Keywords:trimetal;self-assemble;nanoplates;AuCu alloy
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Songfang Zhao,Xiangying Meng,Lin Liu,Wenjie Bo,Meili Xia,Ruliang Zhang,Duxia Cao,Jong-Hyun Ahn
Although the development of wearable strain sensors with a wide sensing range (>50%) and high sensitivity (gauge factor (GF), > 100) is highly desirable, it also presents a grand challenge owing to the inverse relationship between sensitivity and sensing range in designing strain-sensing materials and geometric structures. In this study, we fabricate versatile conductive composites by embedding polypyrrole-coated copper nanowire (Cu@PPy NW)–threaded Ag nanoflowers (NFs) in a poly(styrene-block-butadiene-block-styrene) (SBS) matrix. The fabrication process is simple, energy–saving, and scalable. Moreover, the obtained cluster structures derived from Cu@PPy NW–threaded Ag NFs endow the composites with excellent electromechanical performance, which is demonstrated by its wide sensing range (up to 185% strain), high sensitivity (GF up to 1.28 × 10 6 ), as well as excellent reliability and stability. The superiority in sensing range and sensitivity is a result of the combination of the fracture–sensing mechanism, constrained crack–propagation mechanism by the matrix, slippage–sensing mechanism, and double bridge functions of Ag NFs and Cu@PPy NWs. The high performance allows the strain sensors to monitor full–range human motions.
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JOURNAL OF POWER SOURCES
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2020
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IF 8.247
Yunshan Zheng,Fu Chen,Xinling Liu,Xiaoyu Guo,Ye Ying,Yiping Wu,Ying Wen,Haifeng Yang
Rational design of the durable catalysts is an important issue for improving the application performance of synthesized electrocatalysts for methanol oxidation reaction (MOR). In this work, mesoporous Pd 6 Ru 4 /TiO 2-1 composite catalyst is prepared by using two-step reaction. Compared with 20%Pd/C, PdRu, Ru/TiO 2-1 , and Pd/TiO 2-1 catalysts, Pd 6 Ru 4 /TiO 2-1 catalyst has several merits of abundant electrochemical surface areas, excellent electrocatalytic activity and long-term-use stability. Ru doping into Pd/TiO 2-1 greatly optimizes the electronic structure of Pd by decreasing its electron density. Pd 6 Ru 4 /TiO 2-1 also exhibits high turnover number (TON), low activation energy ( ΔEa ) values for MOR, and higher tolerance to CO-poisoning. A satisfactory level of methanol conversion to the final products is validated by chromatographic results. Density functional theory (DFT) calculation could deepen the understanding of excellent tolerance to CO-poisoning.
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TENSIDE SURFACTANTS DETERGENTS
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2020
·Vol. 57
·期 5
·414-419
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IF 1.089
Yongchen Cai,Xiuying Chen,Hujun Xu
In the present study, three amide Gemini surfactants of different chain lengths were synthesized, namely N,N-bis-dodecyl-2,6-pyridinium dimethylamide propionate sodium (DLP-12), N,N-bis-tetradecyl-2,6-pyridinium dimethylamide propionate sodium (DLP-14) and N,N-bis-hexadecyl-2,6-pyridinium dimethylamide propionate sodium (DLP-16). Their chemical compositions and structures were characterized by FTIR, 1 H NMR and mass spectrometry. Moreover, tensiometry, Langmuir monolayer and conductivity measurements were performed to investigate the micellization and chemical surface properties of the surfactants. The results of the characterization proved that the synthesis of DLP-12, DLP-14 and DLP-16 was successful. Among the investigated surfactants DLP-16 had optimum properties such as a higher emulsification ability as well as a lower surface tension. Furthermore, by calculating the critical packing parameter (CPP), the aggregation morphology of the DLP-12, DLP-14 and DLP-16 was also predicated in this study.
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Nanoscale Advances
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2020
·Vol. 2
·期 4
·1603-1612
·
IF 0
Haiyan Xiang,Yueshao Zheng,Yue Sun,Tingting Guo,Pei Zhang,Wei Li,Shiwei Kong,Miray Ouzounian,Hong Chen,Huimin Li,Travis Shihao Hu,Gang Yu,Yexin Feng,Song Liu
Designing effective catalysts by controlling morphology and structure is key to improving the energy efficiency of fuel cells. A good understanding of the effects of specific structures on electrocatalytic activity, selectivity, and stability is needed. Here, we propose a facile method to synthesize PtCu bimetallic nanostructures with controllable compositions by using Cu nanowires as a template and ascorbic acid as a reductant. A further annealing process provided the alloy PtCu with tunable crystal structures. The combination of distinct structures with tunable compositions in the form of PtCu nanowires provides plenty of information for better understanding the reaction mechanism during catalysis. HClO4 cyclic voltammetry (CV) tests confirmed that various phase transformations occurred in bimetallic and alloy samples, affecting morphology and unit cell structures. Under a bifunctional synergistic effect and the influence of the insertion of a second metal, the two series of structures show superior performance toward methanol electrooxidation. Typically, the post-product alloy A-Pt14Cu86 with a cubic structure (a = 3.702 Å) has better methanol oxidation reaction (MOR) catalysis performance. Density functional theory (DFT) calculations were performed to determine an optimal pathway using the Gibbs free energy and to verify the dependence of the electrocatalytic performance on the lattice structure via overpotential changes. Bimetallic PtCu has high CO tolerance, maintaining high stability. This work provides an approach for the systematic design of novel catalysts and the exploration of electrocatalytic mechanisms for fuel cells and other related applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2020
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IF 3.99
Mengjing Cao,Qiang Cai,Guangfan Guo,Jinyao Yang,Dong Chen
Magnetic composite polymeric microspheres have several technical advantages in improving oil recovery applications. Swelling and stability are key properties that are a direct result of water shutoff efficacy. However, the important aspect of swelling and stability is the materials of the microspheres. In this paper, multiple–shell structures of magnetic hybrid composite spherical particles with different materials which were Fe 3 O 4 @SiO 2 @PAM, Fe 3 O 4 @TiO 2 @PAM, Fe 3 O 4 @SiO 2 @PAM-MBAAm were synthesized via a combination method and theirs physical properties including morphology, particle size distribution, and water swelling property were thoroughly examined. Meanwhile, the plugging performances were studied. The main goal of this paper was to investigate effect of materials of constituents on swelling properties of microspheres. The results demonstrate that both inorganic and organic constituents can affect the swelling properties of microspheres. Moreover, plugging properties of microspheres with different components are different at different salt concentrations, temperatures and pH values. Meanwhile, the results also open up possibilities for studying on the system of heat-resistant, salt-resistant, and pH-resistant oil displacement agent.
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DALTON TRANSACTIONS
·
2020
·Vol. 49
·期 15
·4887-4895
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IF 4.174
Weiliang Qi,Xiangjian Meng,Samira Adimi,Haichuan Guo,Tiju Thomas,Fei Li,Heng Jiang,Siqi Liu,Minghui Yang
To enable high-efficiency solar energy conversion, rational design and preparation of low cost and stable semiconductor photocatalysts with associated co-catalysts are desirable. However preparation of efficient catalytic systems remains a challenge. Here, N-doped TiO2/ternary nickel-zinc nitride (N–TiO2–Ni3ZnN) nanocomposites have been shown to be a multi-functional catalyst for photocatalytic reactions. The particle size of Ni3ZnN can be readily tuned using N–TiO2 nanospheres as the active support. Due to its high conductivity and Pt-like properties, Ni3ZnN promotes charge separation and transfer, as well as reaction kinetics. The material shows co-catalytic performance relevant for multiple reactions, demonstrating its multifunctionality. Density functional theory (DFT) based calculations confirm the intrinsic metallic properties of Ni3ZnN. N–TiO2–Ni3ZnN exhibits evidently improved photocatalytic performances as compared to N–TiO2 under visible light irradiation.
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