DYES AND PIGMENTS
·
2017
·
IF 3.473
Xiao-Lei Zhao,Hui-Fen Qian,Wei Huang
A family of bi-heterocyclic dyes have been first synthesized by using heterocyclic pyridone and benzothiazole components. UV−Vis spectral analyses reveal distinct spectral behaviors depending on the introduced electron-withdrawing and electron-donating groups in the benzothiazol ring as well as the polarity of solvents. Namely, nitrobenzothiazol based bi-heterocyclic dyes display more obvious solvatochromism compared with both methylbenzothiazol based ones and previously reported azobenzene based half-heterocyclic pyridone dyes. More interestingly, 1 H NMR and UV−Vis spectral results as well as single-crystal structures manifest that these dyes are in the hydrazone form in the solid state and in the non-polar solvents. However, they adopt dominating azo form in polar solvents and it can be transformed to the hydrazone form in the acidic condition, which are both different from all known half-heterocyclic pyridone dyes. In addition, transformation from hydrazone to deprotonated azo form can be achieved via metal-ion complexation, and four Ni II and Cu II complexes with different pyridone N -tails have been structurally characterized. It is noted that the ligands adopt different tridentate coordination fashions with Ni II and Cu II ions and a rare tetranuclear Cu II complex with equal Cu⋯Cu separation is obtained.
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REACTIVE & FUNCTIONAL POLYMERS
·
2020
·
IF 3.333
Liwei Sun,Jingyi Luo,Ming Gao,Shaokun Tang
Developing solid materials with high CO 2 adsorption capacity and catalytic activity has been a hotspot due to the greenhouse effect. In this work, bi-functionalized ionic liquid 1-vinyl-3-methoxyethyl imidazolium glycinate ([VMOEim][Gly]) was copolymerized with crosslinker divinylbenzene (DVB) to obtain bi-functionalized ionic liquid porous copolymers P( n DVB-[VMOEim][Gly]) and HP( n DVB-[VMOEim][Gly]). These copolymers possess loose stack of small particles or laminates, and they contain mesopores and a small number of micropores. For HP(0.6DVB-[VMOEim][Gly]), surface area reaches up to 508 m 2 ·g −1 and the initial decomposition temperature is about 180 °C. Then these porous copolymers were applied for CO 2 adsorption at 25 °C and cycloaddition reaction of CO 2 with epichlorohydrin under ambient pressure and cocatalyst-free condition. The maximum CO 2 capture capacity is 64.5 mg/g with HP(0.6DVB-[VMOEim][Gly]) as adsorbent. The effects of catalyst type, catalyst dosage, reaction time and temperature on the yield of cyclic carbonate were also investigated. The optimum conditions are 4 wt% of HP(0.6DVB-[VMOEim][Gly]) (based on the epichlorohydrin) as catalyst at 130 °C for 10 h, and the yield of 4-(chloromethyl)-1,3-dioxolan-2-one can reach 94%. Furthermore, the catalytic activity of HP(0.6DVB-[VMOEim][Gly]) maintains and the yield is 91% after five-cycle experiment. The mechanism of cycloaddition reaction was also discussed.
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Advanced Science
·
2024
·Vol. 11
·期 28
·2401730
·
IF 14.3
Qian Yao,Cheng Zheng,Kejun Liu,Mingyue Wang,Jinmei Song,Lifeng Cui,Di Huang,Nana Wang,Shi Xue Dou,Zhongchao Bai,Jian Yang
Sodium ion batteries (SIBs) are considered as the ideal candidates for the next generation of electrochemical energy storage devices. The major challenges of anode lie in poor cycling stability and the sluggish kinetics attributed to the inherent large Na + size. In this work, Bi nanosphere encapsulated in N-doped carbon nanowires (Bi@N-C) is assembled by facile electrospinning and carbonization. N-doped carbon mitigates the structure stress/strain during alloying/dealloying, optimizes the ionic/electronic diffusion, and provides fast electron transfer and structural stability. Due to the excellent structure, Bi@N-C shows excellent Na storage performance in SIBs in terms of good cycling stability and rate capacity in half cells and full cells. The fundamental mechanism of the outstanding electrochemical performance of Bi@N-C has been demonstrated through synchrotron in-situ XRD, atomic force microscopy, ex-situ scanning electron microscopy (SEM) and density functional theory (DFT) calculation. Importantly, a deeper understanding of the underlying reasons of the performance improvement is elucidated, which is vital for providing the theoretical basis for application of SIBs.
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Advanced Healthcare Materials
·
2026
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IF 11
Meihaguli Abulaizi,Maierhaba Aili,Zhong Du,Jiabao Xiong,Cailing Ma,Rong Ma,Nuernisha Alifu,Biao Dong
Cervical cancer (CC) treatment is limited by chemoresistance, inadequate drug accumulation, and the lack of real-time monitoring. Among the underlying mechanisms, heat shock protein 70 (HSP70) mediates resistance to both chemotherapy and photothermal therapy, making it a rational target for intervention. To address these issues, we developed a novel type of cyclic RGD (cRGD) encapsulated SN38 and IR820 loaded bismuth selenide theranostic nanoplatforms-Bi 2 Se 3 -cRGD@SN38/IR820 nanoparticles (Bi-A@SR NPs) based on a bismuth selenide (Bi 2 Se 3 ) as core decorated with cRGD for tumor targeting, and co-loaded with SN38 and IR820. The RGD peptide contains a guanidino group from its arginine residue that can serve as a donor for nitric oxide (NO) generation, enabling the construct to provide both tumor-homing capability and on-demand NO release. The nanoplatform integrates computed tomography (CT) imaging and NIR fluorescence imaging (NIRF) to verify delivery and guide therapy. Upon 808 nm irradiation, photothermal and photodynamic effects generate hyperthermia and reactive oxygen species (ROS), which trigger on-site NO production from the RGD arginine moiety. This NO suppresses therapy-induced HSP70 upregulation, counteracting stress adaptation and enhancing chemo–phototherapy efficacy. By combining imaging-guided delivery, on-demand NO sensitization, and HSP70 inhibition, this nanotheranostic strategy offers a coordinated approach to improving treatment outcomes in CC.
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ChemistrySelect
·
2026
·Vol. 11
·期 5
·e05271
·
IF 2
Jiahao Lu,Hongtao Jin,Hepeng Zhang,Zhong Tian,Xiaoqi Sun
In this article, a series of bismuth (Bi)-doped rare-earth molybdate orange pigments with near infrared (NIR) properties were synthesized by high temperature solid phase reaction at 1400°C with the general formula of Y 4−x Bi x MoO 9 . The prepared pigments were characterized by analytical techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), CIE 1976 color space system, and ultraviolet-visible/near-infrared spectroscopy (UV-Vis/NIR). After doping Bi 2 O 3 into Y 4 MoO 9 , its color changes from yellow to red and finally to orange. All the doped samples belong to the monoclinic crystal system. All pigment samples have an NIR reflectance (R%) of over 97% at 1100 nm. In the study of acid and alkali resistance, the color difference value Δ E * of the pigment before and after soaking in acidic and alkaline solutions is less than 2, indicating its good chemical stability. In the coating simulation investigation, the indoor air temperature difference between the house model coated with synthetic pigments and the house model coated with commercial pigments reaches 8.2°C, indicating that Y 4-x Bi x MoO 9 pigments had good isolation effect and application prospects as a cool pigment.
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CHEMICAL ENGINEERING SCIENCE
·
2026
·
IF 5.1
Zhongshuang Xu,Chiyu Shen,Pengxu Yan,Xiaojing Zhang,Shuai Wang,Zhimao Yang,Chuncai Kong,Qikui Fan
Temperature is a key operating variable that governs both activity and selectivity in the electrochemical CO 2 reduction reaction (CO 2 RR). Here, we systematically elucidate the temperature-dependent behavior of a bismuth-based catalyst supported on carbon nanotubes (Bi-CNT) over a broad window of 303–343 K. The catalyst delivers a maximum Faradaic efficiency of 95% for formate at 318 K, accompanied by a high partial current density for formate of 285.6 mA cm −2 at a total current density of 300 mA cm −2 . By combining in-situ Raman spectroscopy with molecular dynamics simulations, we reveal that the moderate heating enhances formate selectivity through a cooperative increase in local alkalinity and a restructuring of the hydrogen‑bond network of interfacial water, which suppress the hydrogen evolution reaction. At elevated temperatures, the attenuation of local alkalinity and the growth of weakly hydrogen‑bonded water populations promote CO and H 2 formation, leading to diminished formate selectivity. These findings establish temperature‑mediated control of the interfacial microenvironment as an efficient strategy for robust, high‑rate CO 2 ‑to‑formate conversion under industrially relevant, thermally dynamic operating conditions.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Taihua Zhang,Xiaofeng Li,Yunfei Lu,Wei Guo,Yan An,Xueting Chang
Polyaniline (PANI) is a promising organic thermoelectric material, but its application is limited by the intrinsic trade-off between electrical conductivity ( σ ) and Seebeck coefficient ( S ). Here, we report a multi-interface engineering strategy to enhance the thermoelectric performance of PANI/Bi₂Te₃ composites. HCl-doped PANI (HPANI) and Bi₂Te₃ are mechanically mixed, and a small amount of emeraldine base PANI (PANI-eb) is introduced to construct additional organic–inorganic interfaces. XPS and UV-vis spectroscopy reveal that these interfaces induce partial de-doping of HPANI, progressively widening the optical bandgap from 1.49 eV to 2.96 eV and reducing carrier concentration. Simultaneously, the increased interfacial density creates energy barriers that filter low-energy carriers, enhancing the average carrier mobility. Hall measurements confirm a mobility increase from 39.9 to 118.6 cm²·V⁻¹·s⁻¹ at 10 wt.% PANI-eb, while carrier concentration decreases monotonically. Temperature-dependent transport further supports the energy-filtering mechanism. Optimized hot pressing at 75 °C improves interfacial contact and polymer chain ordering, leading to simultaneous enhancement of σ and S . The resulting composite achieves a room-temperature S of 149.1 μV·K⁻¹, σ of 17.35 S·cm⁻¹, and a power factor of 38.59 μW·m⁻¹·K⁻¹, which is comparable to the best literature values for bulk PANI-based composites. This work demonstrates that rational interfacial design with PANI-eb, combined with moderate thermal treatment, provides an effective strategy to balance σ and S in polymer-based thermoelectric materials.
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APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Xiaohan Li,Yi Wen,Chenguang Qian,Bowen Cui,Fang Yuan,Chunquan Li,Zhiming Sun
Diatomite-induced amino coordination transformation Bi-MOF composite was prepared. • Surface silanol groups modulate Bi 3+ coordination, inducing amino ligand transformation. • The coordination transformation forms highly dispersed NH 2 -Bi-MOF nanowhiskers. • The composite shows enhanced photocatalysis, cycling stability and lower costs. Developing photocatalysts featuring outstanding catalytic activity and economic viability contributes greatly to artificial carbon cycling and addressing energy and environmental challenges. In this study, we adopted a strategy combining amino ligand modification with diatomite support to successfully synthesize amino-modified NH 2 -Bi-MOF/diatomite composites. These materials utilize the silanol groups on the diatomite surface to modulate the coordination environment of the Bi 3+ metal centers, inducing the conversion of amino ligands and promoting the formation of Bi-N bonds, thereby transforming the morphology of the NH 2 -Bi-MOF from an agglomerated state to highly dispersed nanowhiskers. The characterization results indicate that the highly dispersed structure endows the material with outstanding chemical stability, light-harvesting capability, CO 2 adsorption capacity, and carrier separation efficiency. Meanwhile, the optimal sample, NH 2 -Bi-MOF/diatomite-0.2, achieves a CO production rate of 10.440 μmol·g −1 ·h −1 , representing increases of 78% and 45% compared to Bi-MOF and NH 2 -Bi-MOF, respectively. Notably, no apparent decline in catalytic performance was observed after four cycles. Furthermore, the introduction of diatomite substantially reduces catalyst preparation costs. This study also systematically elucidates the conversion mechanism of amino ligands and the interfacial synergy between diatomite and NH 2 -Bi-MOF, clarifying the photocatalytic CO 2 reduction pathways and core mechanisms of the composite material. The findings provide new insights for the development and industrial application of highly efficient and economical photocatalysts. Download: Download high-res image (191KB) Download: Download full-size image
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Dan Wu,Yanni Lang,Liang Xu,Qiyuexin Wang,Qiu Fu,Bingli Li,Xinye Zhao,Zhaoyi Yin,Yongjin Li,Dacheng Zhou,Yangke Cun,Zhiguo Song,Yugeng Wen,Yong Yang,Jin Han,Jianbei Qiu
The circular dichroism (CD) signal of D-BiOBr/Bi 0.3 g flipped and intensified. • The nanosheets of D-BiOBr/Bi 0.3 g were arranged in a spiral (counterclockwise) manner, forming petal-shaped nanospheres. • 0.3 g D-BiOBr/Bi exhibits a CO production rate of 84.27 μmol・g −1 h −1 , 3.34 times the value of D-BiOBr and 4.00 times that of 0.3 g pristine BiOBr/Bi sample. • LSPR boosts the migration of spin−down polarized electrons and improves the separation efficiency of photogenerated electron−hole pairs. Chiral inorganic nanomaterials have shown considerable promise in photocatalysis, owing to their distinctive optical activity and asymmetric interfacial effects. Metallic bismuth (Bi) exhibits a localized surface plasmon resonance (LSPR) effect, which markedly enhances both the generation and separation efficiencies of photogenerated electron-hole pairs. By employing D-sorbitol as a chiral inducer, we successfully synthesized chiral D-BiOBr/Bi nanocomposites. We propose that the synergistic integration of metallic Bi and chiral BiOBr enables effective modulation of chirality-induced spin selectivity (CISS), thereby enhancing spin polarization and promoting CO production from CO 2 reduction. Among the prepared samples, D-BiOBr/Bi 0.3 g exhibited the highest photocatalytic CO 2 reduction activity, selectively converting CO 2 to CO. The CO production rate of D-BiOBr/Bi 0.3 g was 84.27 μmol g −1 h −1 , which was 4.00 times and 3.34 times that of BiOBr/Bi 0.3 g and D-BiOBr respectively. Furthermore, magnetic conductive atomic force microscopy (Mc-AFM) measurements revealed that D-BiOBr/Bi 0.3 g generated the strongest tunneling current with an opposite polarity compared to its controls, providing indirect evidence for CISS-associated spin-selective charge transport. Collectively, our findings demonstrate a strong coupling between the LSPR of metallic Bi and structural chirality, which cooperatively boosts spin-polarized electron generation, accelerates electron-hole pair separation, and significantly improves photocatalytic CO 2 reduction performance.
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BIOSENSORS & BIOELECTRONICS
·
2025
·
IF 10.5
Yuqing Zhang,Jingjing Ye,Jiayi Fu,Honglin Song,Yifu Zhou,Xu Wu,Xinyue Jia,Ruo Yuan,Wenju Xu
Exploring a responsive cascaded amplifier of bi-recycled strand displacement ( b SD) and mismatch-mediated hairpin assembly ( m HA) might be intriguing for constructing sensitive electrochemical biosensor. The proof-of-concept example for operating b SD started with the design of a recognizable hairpin encoding three functional modules, including specific complement, contiguous Nt.BbvCI site, and locked primer-matchable fragment. Upon introducing a targeted short-stranded oligonucleotide segment, b SD events were activated to execute repetitive strand elongation and nicking-mediated displacement reaction, generating a target analogue to implement similar affinity recognition for cooperative autocatalysis. This progress efficiently guided the production of numerous analogues for unfolding a metastable double-stem hairpin structure, and rationally induced progressive m HA via cross-opening and sequential hybridization between two functional hairpins, in one of which the inclusion of a mismatched base was beneficial for driving b SD- m HA cascade faster forward. As such, the labeled electroactive ferrocene (Fc) tags were orderly anchored in the resulting long linear product, thereby achieving significant amplification of current signal and highly sensitive detection down to femtomole. Compared with conventional hairpin assembly, our b SD- m HA-based logic operation substantially improved the transduction reaction kinetics, showing about 4.6-fold increment of reaction rate, while higher amplification yield emerged at lower trigger was more superior than b SD or m HA alone. Thus, this cascade-amplifying strategy would suggest a new paradigm to create robust and cost-effective electrochemical biosensors for applicable biosensing and bioassay.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
·
IF 4.6
Feng Zhou,Shijie Liu,Yuanyuan Zhao,Xinzhi Liu,Danfeng Qin,Hua Liu
In this work, a high-sensitivity electrochemical sensor was developed using a hybrid strategy, where sheet-like MXenes-based composites (Bi-MOF/MXenes) were prepared through the in-situ growth of bismuth-based metal-organic frameworks (Bi-MOF) on the MXenes surface. This hybrid composite material was fabricated using a simple physical synthesis method, which maintains excellent electrocatalytic activity while enhancing the electron transfer rate and electroactive surface area. The Bi-MOF/MXenes modified electrode has been demonstrated to be an effective tool for the detection of nitrite. The electrode exhibited a remarkable limit of detection (LOD) of 0.028 μM and a wide linear range of 0.5~4715 μM. The sensor exhibited remarkable repeatability and reproducibility, with relative standard deviation (RSD) values of 1.74% and 4.87%, respectively. The proposed approach was effectively utilized for detecting nitrite in sausage and fermented bean curd.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Jianxing Liu,Lin Nie,Jiamu Liu,Fengling Zhang,Yu Zhang,Mao Liu
Efficient photocatalytic nitrogen fixation critically depends on rapid charge carrier transport and effective surface reactions. In this study, a Bi 2 MoO 6 -based photocatalyst was successfully developed through surface modification with varying concentrations of ascorbic acid. After modification by ascorbic acid, defects were introduced on the surface of Bi 2 MoO 6 catalyst, which changed the octahedral coordination environment of MoO 6 , resulting in structural adjustment, reduced band gap, increased conduction potential, and reduced surface work function. These changes facilitated accelerated photo-induced charge migration and separation of Bi 2 MoO 6 . Consequently, the efficiency of photogenerated charge carrier separation was significantly enhanced, resulting in improved photocatalytic performance. Notably, the optimized BMO-1 catalyst exhibited a maximum NH 3 production rate of 240.5 μmol·g −1 ·h −1 without the use of sacrificial agents under visible light irradiation, which is 4.5 times higher than that of pristine Bi 2 MoO 6 . This work demonstrates a simple, effective, and controllable strategy for catalyst modification to boost photocatalytic nitrogen fixation performance.
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