Journal of Materials Chemistry B
·
2019
·Vol. 7
·期 24
·3846-3855
·
IF 5.047
Bin Wang,Cheng Li,Lijun Yang,Congrou Zhang,Li-Juan Liu,Sen Zhu,Yu Chen,Yong Wang
The development of “turn-on” fluorescence probes for biological thiol detection has received great attention in recent years because abnormal levels of these mercapto biomolecules are always related to some form of disease. In this work, a series of AIE-active polymer probes for biothiol detection were designed and synthesized, comprising disulfide-functionalized hyperbranched poly(amido amine) (ssHPA) as the hydrophilic matrix, tetraphenylethene (TPE) as the hydrophobic AIE-active fluorogen and a disulfide bond as the cleavable functional linkage, defined as TPE-ssHPAs. When these polymers were targeted as “turn on” fluorescence probes for the detection of biothiols, no organic solvents or heavy metal ions were needed as the quencher to eliminate background signals because of the relatively rigid dendritic structure. Upon introducing glutathione or cysteine to an aqueous solution of TPE-ssHPAs, bright fluorescence occurred because of the collapsing of the dendritic structure, leading to the aggregation of TPE units. Further in vitro experiments verified that TPE-ssHPAs is a qualified probe for biothiol detection in living cells. In addition, this strategy of embedding AIEgens inside a relatively rigid hyperbranched polymer offers an effective solution to “pre-quench” the fluorescence of “turn-on” type AIE-active sensors.
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Catalysis Science & Technology
·
2017
·Vol. 7
·期 18
·4007-4016
·
IF 5.773
Sen Liu,Guozhu Li,Yuying Gao,Zhourong Xiao,Junfeng Zhang,Qingfa Wang,Xiangwen Zhang,Li Wang
In this work, polydopamine (PDA)-coated multi-walled carbon nanotubes (CNTs) have been employed as reactive platforms for the anchoring of multiple heteroatom dopants. Single-, double-, and triple-doped CNTs with the elements N, S and B have been successfully prepared and systematically investigated as electrocatalysts for the oxygen reduction reaction (ORR). The obtained catalysts have been fully characterized by the nitrogen-adsorption technique, transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and Raman spectroscopy. Combining with the physicochemical properties of different doped CNTs and their catalytic performance, various doping modes are compared and the mechanism of these processes has been investigated. The synergetic effects on double and triple doped CNTs with N, S, and B are found. The new non-metal catalyst N–S–B-CNTs exhibits high electrocatalytic activity and good stability for ORR.
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Small
·
2021
·Vol. 17
·期 52
·2105643
·
IF 13.281
Bo Liu,Linjuan Zhang,Yuanyuan Luo,Lei Gao,Guotao Duan
The supported metal catalysts on scaffolds usually reveal multiple active sites, resulting in the occurrence of side reaction and being detrimental to the achievement of highly consistent catalysis. Single atom catalysts (SACs), possessed with highly consistent single active sites, have great potentials for overcoming such issues. Herein, the authors used SACs to modulate kinetic process of gas sensitive reaction. The supported Pd SACs, established by a metal organic frameworks-templated approach, promoted greatly the detection capacity to hydrogen sulfide (H 2 S) gas with a very high sensitivity and selectivity. Density functional theory calculations show that the supported Pd SACs not only increased the number of electrons transferring from H 2 S molecules to Pd SACs, but strengthened surface affinity to H 2 S. Moreover, the H S bonds of H 2 S molecules absorbed on Pd atomic sites are more likely to be dehydrogenated directly into sulfur species. Significantly, quasi in situ XPS analysis confirmed the presence of sulfur species during H 2 S detection process, which may be a major cause for such detection signal. Based on these results, a suitable sensing principle for H 2 S gas driven by Pd SACs was put forward. This work will enrich catalytic electronics in chemiresistive gas sensing.
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JOURNAL OF CONTROLLED RELEASE
·
2024
·
IF 10.5
Zhaowei Chu,Zhili Li,Haiyang Yong,Delu Che,Bingjie Li,Cong Yan,Tong Zhou,Xi Wang,Yuqing Feng,Kun Guo,Songmei Geng
Melanoma , one of the most devastating forms of skin cancer, currently lacks effective clinical treatments. Delivery of functional genes to modulate specific protein expression to induce melanoma cell apoptosis could be a promising therapeutic approach. However, transfecting melanoma cells using non-viral methods, particularly with cationic polymers, presents significant challenges. In this study, we synthesized three branched poly(β-amino ester)s (HPAEs) with evenly distributed branching units but varying space lengths through a two-step “oligomer combination” strategy. The unique topological structure enables HPAEs to condense DNA to form nano-sized polyplexes with favorable physiochemical properties. Notably, HPAEs, especially HPAE-2 with intermediate branching unit space length, demonstrated significantly higher gene transfection efficiency than the leading commercial gene transfection reagent, jetPRIME, in human melanoma cells. Furthermore, HPAE-2 efficiently delivered the Bax-encoding plasmid into melanoma cells, leading to a pronounced pro-apoptotic effect without causing noticeable cytotoxicity. This study establishes a potent non-viral platform for gene transfection of melanoma cells by harnessing the distribution of branching units, paving the way for potential clinical applications of gene therapy in melanoma treatment.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 12
·5223-5231
·
IF 2.7
Tingli Ren,Yuanfeng Liu,Xiaoqiu Lin,Congju Li
The fairly low power density, mainly resulting from poor electroactive bacterial (EAB) adhesion and the sluggish extracellular electron transfer (EET) at the anode interface, constrains the practical implementation of microbial fuel cells (MFCs). Therefore, the properties of the anode material are considered to be a crucial factor for the long-term operational performance of MFCs. In order to enhance the power production performance of MFCs, an aerogel composed of Fe, N, and S co-doped carbon nanofibers (CNFs) and reduced graphene oxide (rGO) was employed as a high-performance anode material by electrospinning, high-temperature pyrolysis and freeze-drying. The doping of Fe, N and S elements induced the formation of abundant reactive sites on the CNFs, which enhanced the electrochemical performance of the anode and the EET process. The huge electroactive area of the samples facilitated the formation of dense biofilms. Therefore, an MFC with the FeS/Fe3C@NCNFs/rGO-modified anode achieved a maximum power density of 2792.56 mW m−2 and the highest output voltage of 0.658 V, both of which were significantly higher than those of the carbon cloth anode (773.97 mW m−2 and 0.443 V). Considering the great improvement in power production, it has considerable potential as a low-cost but high-performance anode material for MFCs.
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2021
·Vol. 146
·期 6
·2445-2462
·
IF 4.626
Usman Muhammad,Yu Haojie,Wang Li,Titinchi Salam,Khan Amin,Naveed Kaleem-ur-Rehman,Nazir Ahsan,Elshaarani Tarig,Fahad Shah,Amin Bilal ul
Ferrocene (Fc)-based polymers have promising application in burning rate catalysts (BRCs) for solid composite propellants, and some of them have already been practically used. However, they have some drawbacks such as high migration during a long-time storage. Copolymers of poly(2-(methacryloyloxy) ethyl ferrocene carboxylate- co -glycidyl methacrylic acid)s (P(FHEMA -co- GMA)s) were synthesized to overcome the migration problem of Fc-based BRCs as well as to boost the burning rate (BR) of ammonium perchlorate (AP)-based propellants. The structures of the obtained P(FHEMA -co- GMA)s were confirmed by proton nuclear magnetic resonance ( 1 H NMR) and Fourier transform infrared (FT-IR) spectroscopy. Cyclic voltammetry (CV) method was used to study their electrochemical behavior, and the P(FHEMA -co- GMA)s showed redox behavior for the existence of the Fc units. Because of the formation of integrated network structures, the P(FHEMA -co- GMA)s have good anti-migration performances. The BR catalytic property of P(FHEMA -co- GMA)s were investigated by thermogravimetry (TG) and differential thermogravimetry (DTG). They showed competent catalytic effects on the thermal decomposition of AP.
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POLYMER COMPOSITES
·
2025
·
IF 4.7
Jiye Jia,Shijie Chen,Haifeng Tian,Dong Wang,Feng Yang,Pei Feng,Cijun Shuai
The low photogenerated charge carriers and quick complex annihilation of titanium dioxide (TiO 2 )/rGO composite leading to an unsatisfactory photocatalysis antibacterial effect limit its application in the bone scaffold. Herein, graphitic carbon nitride (g-C 3 N 4 ) was assembled with TiO 2 /rGO via a solvothermal method for enhancing the photocatalysis antibacterial properties of poly (lactic acid) (PLLA) bone scaffold prepared via selective laser sintering. The results revealed that g-C 3 N 4 expanded the light absorption range of TiO 2 /rGO from blue-violet light to visible light, resulting in the composites having a narrower band gap and producing more photoinduced charge carriers. More importantly, an S-scheme heterojunction was formed between g-C 3 N 4 and TiO 2 , which promoted the recombination of the electrons in the conduction band of TiO 2 and the holes in the valence band of g-C 3 N 4 . Meanwhile, rGO with excellent electrical conductivity reduced the interfacial charge transfer resistance and enhanced charge transfer efficiency, thus further avoiding the recombination rate of electrons and holes, whether TiO 2 or g-C 3 N 4 , and enhancing the photocatalytic properties. Consequently, the holes in the valence band of TiO 2 and the electrons in the conduction band of g-C 3 N 4 possessed high oxidation and reduction capacity, which oxidized H 2 O and reduced O 2 in the microenvironment, respectively, and generated lots of reactive oxygen species. In vitro antibacterial experiments indicated that the PLLA/TiO 2 /g-C 3 N 4 /rGO scaffold showed a better antibacterial effect, with the bacteriostasis rates of E. coli and S. aureus being 99.1% and 98.9%, respectively. In addition, cell adhesion and fluorescence results indicated that the scaffold had good biocompatibility and could provide a suitable microenvironment for the growth and proliferation of cells.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Xiushuai Guan,Xiaochao Zhang,Changming Zhang,Rui Li,Jianxin Liu,Yunfang Wang,Yawen Wang,Caimei Fan,Zhong Li
Photocatalysis CO 2 reduction into high-value-added chemical feedstocks is desirable for simultaneously addressing the solar energy storage, CO 2 excess and energy shortage issues. In this work, a kind of original S-scheme BiOBr-(0 0 1)/Bi 2 SiO 5 /Bi (OSB) heterostructure photocatalyst with rich oxygen vacancies is in-situ synthesized, which significantly promotes the photocatalytic CO 2 reduction performance. Interestingly, the lower formation energy of oxygen vacancy exhibits the easy feasibility on the BiOBr-(0 0 1) surface via the assistant of ultrasound. There exists the highest photocatalytic CO 2 reduction activity to CO of 234.05 μmol g -1 h −1 for OSB-20 sample (ultrasound time: 20 min), higher 3.3 times than OSB-0 sample (without ultrasound). Combined with experimental and calculated results, the significative formation mechanism, widened light-response range, highly-efficient separation/transfer paths and improved redox-reduction abilities of photogenerated electron-hole pairs for S-scheme OSB-20 heterostructure are investigated and proposed. Our findings provide new insights for the construction and synthesis of the S-scheme Bi-based heterojunction photocatalyst system.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 7
·3834-3844
·
IF 11.301
Daying Guo,Zihe Zhang,Bin Xi,Zhisheng Yu,Zhen Zhou,Xi'an Chen
Reported herein is the investigation of a unique cathode candidate for Li–S batteries, i.e. Ni3S2/(N, S)-RGO-type hybrid materials, which are expected to optimize battery performance by elevating the utilization of sulfur and chemically confining the adsorption/diffusion of polysulfide. Versatile structural and compositional characterizations confirmed the uniform growth and strong chemical coupling of nanostructured Ni3S2 on the N/S co-doped RGO matrix. Rich physical and chemical properties were revealed, namely, the large specific surface area and pore volume, which are beneficial for polysulfide capture, and the 3D conductive network supporting rapid charge transfer to the Ni3S2-polysulfide interface to improve the intrinsic equilibrium of the polysulfide. Specifically, the integration of ∼28.2 wt% of Ni3S2 produced a highly pleated composite with the largest BET specific surface area (618 m2 g−1) and pore volume (1.73 cm3 g−1) among the hybrids studied. This typical material also performed the best in the battery test, recording ultra-high cycling stability over 1000 cycles at the current density of 3C with the capacity decay of 0.023% per cycle. As the sulfur loading per unit area became as dense as 5.8 mg cm−2, the specific capacities were measured as 6.72 mA h cm−2 (at 0.05C), while the capacity retention for the 200-cycle test (at 1C) was still preserved above 72.5%.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Yandong Xu,Wenhao Su,Zihui Jing,Zhouyu Jiang,Mingliang Wang
The development of highly active photocatalysts for H 2 O 2 production is of significant practical importance for addressing environmental issues and energy shortages. In this study, an S-scheme heterojunction photocatalyst with strong redox performance was synthesized through the in-situ growth of the TpPa-Cl covalent organic framework (COF) material on the surface of Cu-loaded ZnO nanorods. The incorporation of Cu disrupts the charge shielding effect of ZnO, promotes the spatial separation of charge carriers, and enhances piezoelectric catalytic activity. Furthermore, the porous ultra-thin COF layer extends carrier lifetime and increases the contact area with reactants, endowing the composite with strong light absorption capacity and excellent oxygen reduction performance. Under the combined influence of the piezoelectric-photocatalytic dual electric field, the H 2 O 2 yield of the composite in pure water reached 1838.8 μmol g −1 h −1 , and the resulting H 2 O 2 solution can be directly utilized for pollutant removal and water disinfection. In situ X-ray photoelectron spectroscopy, density functional theory calculations, and electron spin resonance studies elucidate the S-scheme electron transfer mechanism, which accelerates the transfer of photogenerated carriers and enhances the utilization of electron-hole pairs. This research offers a novel approach for the design and development of catalysts aimed at efficient H 2 O 2 production.
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DALTON TRANSACTIONS
·
2024
·Vol. 53
·期 10
·4671-4679
·
IF 3.5
Xinlei Zhang,Xia Liu,Peng Liu,Bohan Li,Yan Xu
Metal-free room-temperature phosphorescent (RTP) materials with changeable colors have attracted great attention in anti-counterfeiting information encryption. Most ultralong-lifetime RTP (URTP) luminophores are traditionally obtained through heavy atom effects via enhancing the spin–orbit coupling efficiency. Here, we report the self-assembly of URTP carbon dots (CDs) using diphenylaminourea as the precursor through a thermal-evaporation assisted covalent-binding approach in the presence of boric acid (BA). The BA-functionalized diphenylaminourea-derived CDs (denoted as D-CDs1.5/BA composites) show a rigid network structure with B–C linkages connected to the surface of the CDs, which can effectively suppress the free vibration of CDs to promote intersystem crossover, finally resulting in an excellent URTP afterglow performance. They feature a low singlet–triplet energy gap and reduced nonradiative attenuation properties. As a result, the D-CDs1.5/BA composites exhibit a bifunctional fluorescence/phosphorescence performance with a high phosphorescence quantum efficiency (12.67%) and an ultra-long green afterglow phosphorescence lifetime of up to 3.66 s. A high-level information encryption and fingerprinting description based on the URTP D-CDs1.5/BA composites were then investigated. This work contributes to the feasible design and preparation of novel URTP CD materials with both ultra-long afterglow and a high phosphorescence efficiency, making them promising candidates for advanced anti-counterfeiting applications.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Nguyen Trung Dung,Vu Dinh Thao,Nguyen Phuong Thao,Cao Thi Minh Thuy,Nguyen Hong Nam,Le Viet Ngan,Kun-Yi Andrew Lin,Ta Cong Khiem,Nguyen Nhat Huy
Biochar is an environmentally friendly material with various potential applications in water treatment. Herein, nitrogen and sulfur co-doped biochars (N,S-BCD-X) were fabricated from durian peel as an agricultural waste by coupling with thiourea via thermal treatment to activate peroxymonosulfate (PMS) for degradation of ofloxacin (OFX) in water. The OFX removal using PMS activated by N,S-BCD-800 was over 85 % after 120 min of reaction, which was 17.78 times higher than that by pure BCD. The OFX degradation was not inhibited over a wide pH range of 3 to 9. Through radical quenching tests, electron paramagnetic resonance, and DFT calculations, 1 O 2 was revealed as the key reactive species in the N,S-BCD-800/PMS system because of PMS’s elongated O-O bond-induced promoted generation of • OH and SO 4 • - with an insignificant contribution and the generation of 1 O 2 via various reactions associated with • OH, SO 4 • - , and PMS. The boosted catalytic activity of N,S-BCD-800 mainly came from synergetic effect of N and S co-doping due to the enhanced electron-donating capability caused by decrease in the work function. Furthermore, the increase in electrostatic potential and the difference in electron density and atomic charge could also account for stronger adsorption and activation of PMS on N,S-BCD-800 to generate more 1 O 2 besides the N,S-BCD-800/PMS complex as a minor species responsible for the degradation of OFX via electron transfer. Finally, the attainment of high efficiency of N,S-BCD/PMS for OFX degradation in various water matrices as well as after 5 cycles proved that N,S-BCD had high stability and applicability.
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