Science China-Materials
·
2018
·Vol. 62
·期 3
·437-447
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IF 4.318
Deng Xiao-Ying,Xie Hui,Du Lan,Fan Cheng-Jie,Cheng Chuan-Ying,Yang Ke-Ke,Wang Yu-Zhong
With the prompt development in intellectualization nowadays, the smart materials with multi-functionality or multi-responsiveness are highly expected. But it is a big challenge to integrate the different actuating units into a single system in a synergy pattern. Herein, we put forward a new strategy to develop the polyurethane networks which can present shape-memory effect and self-healing effect in independent way as well as simultaneous acting mode. To realize this goal, poly(tetremethylene ether) glycol was chosen as the soft segment to ensure the polymer chains a good mobility, and disulfide bond as the dynamic covalent bond was embedded in the backbone of polyurethane to endow it with desirable self-healing capacity under mild condition. Moreover, a rational control of the architecture of the networks by adjusting the content of disulfide bond and the degree of cross-linking, a broad glass transition temperature ( T g ) was achieved, which enabled the network a versatile shape-memory effect, covering from dual-, triple- so far as to quadruple-shape memory effect. More importantly, the shape recovery and healing process can be realized simultaneously because of the highly matched actuating condition in this system.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2018
·Vol. 30
·期 2
·1724-1738
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IF 2.324
Sun Ning,Ye Zi,Kuang Xuliang,Liu Weijing,Li Gaofang,Bai Wei,Tang Xiaodong
Zn 1−x Ni x O (X = 0%, 1%, 3%, 5%, 10%) nanowires were synthesized by the hydrothermal method, and the prepared materials were characterized and analyzed by XRD, SEM and XPS. Then, the materials were positioned on the pre-designed Ti/Au interdigital electrode to fabricate humidity sensors by the dielectrophoresis method. The humidity sensitive characteristics of the sensors were studied by combining complex impedance spectroscopy and theory of multilayer adsorption. The results show that the surface oxygen vacancies concentration can be regulated by Ni doping process. Under the combined action of Ni ions and oxygen vacancies, the performance of humidity sensors has been improved significantly. Especially, 5% Ni doped ZnO humidity sensor shows a high capacitance sensitivity, which is varied by more than four orders of magnitude with increasing the relative humidity from 11 to 95%, respectively. Moreover, the response time and recovery time are reduced to 27 s and 2 s, which is much better than undoped ZnO humidity sensor. The results indicate that the doping of Ni elements play an important role in the sensing property improvement of ZnO humidity sensor.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·11310
·
IF 4.259
Cheng Shumin,Tang Shanshan,Tsona Narcisse T.,Du Lin
To study the influence of the position of the double bond and ring size on the stability of hydrogen bonded complexes, the 1:1 complexes formed between 2,2,2-trifluoroethanol (TFE) and three heterocyclic compounds including 2,3-dihydrofuran (2,3-DHF), 2,5-dihydrofuran (2,5-DHF) and 3,4-dihydropyran (3,4-DHP) were investigated systematically. The formation of hydrogen bonded TFE−2,3-DHF, TFE−2,5-DHF and TFE−3,4-DHP complexes were identified by gas phase FTIR spectroscopy at room temperature, and the OH-stretching fundamental transition of TFE was red shifted upon complexation. The competition between the O atom and π-electrons bonding sites within the complexes was studied, and the O−H···π type hydrogen bond was found to be less stable than the O−H···O in all three cases. The observed red shifts of the OH-stretching fundamental transitions in the complexes were attributed to the formation of O−H···O hydrogen bond. Equilibrium constants of the complexation reactions were determined from measured and calculated OH-stretching fundamental intensities. Both theoretical calculations and experimental results reveal that the hydrogen bond strengths in the complexes follow the sequence: TFE−2,5-DHF > TFE−2,3-DHF ≈ TFE−3,4-DHP, thus the position of the double bond exerts significantly larger influence than ring size on the stability of the selected hydrogen bonded complexes.
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ACTA PHARMACOLOGICA SINICA
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2024
·
IF 6.9
Han Yu,Zhang Jia-qi,Ji Ya-wei,Luan Yi-wen,Li Shu-yi,Geng Hui-zhen,Ji Ying,Yin Cui,Liu Su,Zhou Chun-yi,Xiao Cheng
Nicotinic acetylcholine receptors (nAChRs) regulate pain pathways with various outcomes depending on receptor subtypes, neuron types, and locations. But it remains unknown whether α4β2 nAChRs abundantly expressed in the substantia nigra pars reticulata (SNr) have potential to mitigate hyperalgesia in pain states. We observed that injection of nAChR antagonists into the SNr reduced pain thresholds in naïve mice, whereas injection of nAChR agonists into the SNr relieved hyperalgesia in mice, subjected to capsaicin injection into the lower hind leg, spinal nerve injury, chronic constriction injury, or chronic nicotine exposure. The analgesic effects of nAChR agonists were mimicked by optogenetic stimulation of cholinergic inputs from the pedunculopontine nucleus (PPN) to the SNr, but attenuated upon downregulation of α4 nAChRs on SNr GABAergic neurons and injection of dihydro-β-erythroidine into the SNr. Chronic nicotine-induced hyperalgesia depended on α4 nAChRs in SNr GABAergic neurons and was associated with the reduction of ACh release in the SNr. Either activation of α4 nAChRs in the SNr or optogenetic stimulation of the PPN-SNr cholinergic projection mitigated chronic nicotine-induced hyperalgesia. Interestingly, mechanical stimulation-induced ACh release was significantly attenuated in mice subjected to either capsaicin injection into the lower hind leg or SNI. These results suggest that α4 nAChRs on GABAergic neurons mediate a cholinergic analgesic circuit in the SNr, and these receptors may be effective therapeutic targets to relieve hyperalgesia in acute and chronic pain, and chronic nicotine exposure.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2025
·
IF 3.8
Zou Ying,Zhang Manli,Zhou Dongdong,Chi Chaoxian,Wu Fangling,Ding Chuan-Fan
Vitamin C (L-( +)-ascorbic acid, L-AA) is an essential micronutrient. Its diastereoisomer, D-(-)-isoascorbic acid (D-IAA), is only 5% as active as L-AA. Therefore, it is crucial to identify and characterize the diastereoisomers of ascorbic acid. In this work, a straightforward and direct method using ion mobility-mass spectrometry (IM-MS) was proposed to identify ascorbic acid isomers. Ternary complexes [L-AA + γ-CD + 2Cs-H] + and [D-IAA + γ-CD + 2Cs-H] + , formed by non-covalent interaction of the isomer with the selective agent γ-CD and the metal ion Cs + , were separated in ion drift tubes with a resolution of R p-p as high as 1.398. Meanwhile, comparisons with different CDs and metal ions revealed varying separation efficiencies. Theoretical calculations were conducted to determine the optimal conformations of [L-AA + γ-CD + 2Cs-H] + and [D-IAA + γ-CD + 2Cs-H] + . Conformational analysis highlighted distinct structural differences at the molecular level, providing insight into the mobility separation mechanism of AA via the formation of ternary complexes with γ-CD and metal ions. Additionally, a quantitative analysis for the determination of chiral isomers was established with effective linearity and acceptable sensitivity. The method was successfully applied to assess L-AA/D-IAA content in pharmaceuticals and fruit samples. Graphical
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Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-7
·
IF 3.125
Wang Jie,Li Meisheng,Qian Ming,Zhou Shouyong,Xue Ailian,Zhang Lili,Zhao Yijiang,Xing Weihong
Abstract TMC-incorporated carbon nitride (CN) with hexagonal and quadrangle honeycomb-like structure and having periodic lattice defects linked by –CONH– bond was synthesized through combining the high calcination with the chemical condensation of melamine and 1,3,5-benzenetricarbonyl trichloride. The obtained CN has a tri-s-triazine ring and benzene ring skeleton, which makes it have excellent mechanical and thermal stability. The BET specific surface area was enhanced to about 125.6 m 2 /g, and the mean pore size is about 3.43 nm. This CN exhibited an excellent adsorption-enhanced photocatalytic performance. Graphical abstract
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2024
·Vol. 149
·期 10
·4655-4670
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IF 3
Qu Haowen,Bai Mingqi,Dang Jing,Shu Chi-Min,Yu Yanan,Li Kai,Deng Zijian,Li Bing,Liu Yi
Methylene diphenyl diisocyanate (MDI) serves as a primary component of polyurethane in various applications, including household appliances, architectural structures, automobiles, and adhesives. A recent MDI plant explosion in China highlighted the importance of studying MDI’s thermal stability and parameters to prevent accidental thermal decomposition. In this study, an extensive array of analytical techniques, including differential scanning calorimetry, thermogravimetric analysis, and adiabatic accelerating calorimeter, was employed to determine the thermokinetic constants of MDI, providing a solid foundation for further in-depth investigations. The findings revealed that MDI containing water reacts at substantially lower temperatures, while pure MDI can release heat and gases in an adiabatic environment, posing a considerable explosion risk. The kinetic constant of MDI was calculated using the Flynn–Wall–Ozawa method, yielding apparent activation energy values ranging from 51.78 to 96.70 kJ mol −1 across a conversion degree range of 0.05–0.70. The Coats–Redfern model pinpointed the kinetic reaction mechanism as a two-stage chemical process based on the apparent activation energy. Molecular optimization, following the energy minimisation principle, was conducted using Gaussian 09 software, which led to the identification of the optimal pathway for generating carbodiimide and carbon dioxide. This investigation offers valuable insights for the effective management of MDI during production, transportation, and storage, contributing to improve loss prevention practices in the industry.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-9
·
IF 14.7
Sun Jikai,Tu Rui,Xu Yuchun,Yang Hongyan,Yu Tie,Zhai Dong,Ci Xiuqin,Deng Weiqiao
The process of CH 4 cracking into H 2 and carbon has gained wide attention for hydrogen production. However, traditional catalysis methods suffer rapid deactivation due to severe carbon deposition. In this study, we discover that effective CH 4 cracking can be achieved at 450 °C over a Re/Ni single-atom alloy via ball milling. To explore single-atom alloy catalysis, we construct a library of 10,950 transition metal single-atom alloy surfaces and screen candidates based on C–H dissociation energy barriers predicted by a machine learning model. Experimental validation identifies Ir/Ni and Re/Ni as top performers. Notably, the non-noble metal Re/Ni achieves a hydrogen yield of 10.7 gH 2 gcat –1 h –1 with 99.9% selectivity and 7.75% CH 4 conversion at 450 °C, 1 atm. Here, we show the mechanical energy boosts CH 4 conversion clearly and sustained CH 4 cracking over 240 h is achieved, significantly surpassing other approaches in the literature.
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Cell Death Discovery
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2025
·Vol. 11
·期 1
·1-17
·
IF 7
Wei Guojiang,Huang Ying,Li Wenya,Xie Yuxin,Zhang Deyi,Niu Yuanjie,Zhao Yang
Metabolic reprogramming in prostate cancer has been widely recognized as a promoter of tumor progression and treatment resistance. This study investigated its association with ferroptosis resistance in prostate cancer and explored its therapeutic potential. In this study, we identified differences in the epithelial characteristics between normal prostate tissue and tissues of various types of prostate cancer using single-cell sequencing. Through transcription factor regulatory network analysis, we focused on the candidate transcription factor, SREBF1. We identified the differences in SREBF1 transcriptional activity and its association with ferroptosis, and further verified this association using hdWGCNA. We constructed a risk score based on SREBF1 target genes associated with the biochemical recurrence of prostate cancer by combining bulk RNA analysis. Finally, we verified the effects of the SREBPs inhibitor Betulin on the treatment of prostate cancer and its chemosensitization effect. We observed characteristic differences in fatty acid and cholesterol metabolism between normal prostate tissue and prostate cancer tissue, identifying high transcriptional activity of SREBF1 in prostate cancer tissue. This indicates that SREBF1 is crucial for the metabolic reprogramming of prostate cancer, and that its mediated metabolic changes promoted ferroptosis resistance in prostate cancer in multiple ways. SREBF1 target genes are associated with biochemical recurrence of prostate cancer. Finally, our experiments verified that SREBF1 inhibitors can significantly promote an increase in ROS, the decrease in GSH, and the decrease in mitochondrial membrane potential in prostate cancer cells and confirmed their chemosensitization effect in vivo. Our findings highlighted a close association between SREBF1 and ferroptosis resistance in prostate cancer. SREBF1 significantly influences metabolic reprogramming in prostate cancer cells, leading to ferroptosis resistance. Importantly, our results demonstrated that SREBF1 inhibitors can significantly enhance the therapeutic effect and chemosensitization of prostate cancer, suggesting a promising therapeutic potential for the treatment of prostate cancer.
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Frontiers in Energy
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2025
·
IF 6.2
Zhao Zihao,Feng Xurui,Feng Daili,Li Chengming,Feng Yanhui,Wei Junjun
The use of porous skeletons for encapsulating phase change materials (PCMs) is an effective approach to addressing issues such as leakage, low thermal conductivity, and poor photothermal conversion efficiency. Inspired by the hollow skeletal structure found in birds in nature, high-quality 3D interconnected hollow diamond foam (HDF) was fabricated using a series of processes, including microwave plasma chemical vapor deposition (CVD), laser perforation, and acid immersion. This HDF was then used as a scaffold to encapsulate PEG2000. The results demonstrate that HDF significantly reduces the supercooling degree and latent heat discrepancy of PEG2000. Compared to pure PEG2000, the thermal conductivity of the HDF/PEG increased by 378%, while its latent heat reached 111.48 J/g, accompanied by a photothermal conversion efficiency of up to 86.68%. The significant performance improvement is mainly attributed to the combination of the excellent properties of the diamond with the inherent advantages of the 3D interconnected structure in HDF, which creates a high-conductivity transport network inside. Moreover, the HDF/PEG composite extends the temperature cycling time of electronic components by 4 times for heating and 2.3 times for cooling, thereby prolonging the operational lifetime of electronic devices. HDF/PEG offers an integrated solution for solar energy collection, photothermal conversion, heat dissipation in electronic components, and thermal energy transfer/storage. This innovative approach provides innovative ideas for the design and fabrication of composite PCMs and has great application potential, such as solar energy utilization, thermal management, and thermal energy storage.
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Nature Communications
·
2025
·Vol. 16
·期 1
·1-9
·
IF 15.7
Wu Yu,Li Jian,Jiang Wenxuan,Xu Weiqing,Zheng Lirong,Wang Canglong,Gu Wenling,Zhu Chengzhou
Early drug discovery is a time- and cost-consuming task requiring enzymes. Although nanozymes with metal sites akin to metallocofactors display similar activities, the lack of proximal amino acids hinders them from more adequately mimicking enzymes for drug discovery purposes. Hence, the rational design of the nanozyme second coordination sphere is desirable yet remains challenging. Herein, we report a nanozyme featuring atomically dispersed Cu-N 4 sites with proximal hydroxyl groups (CuNC-OH). Experimental and theoretical results reveal that Cu-N 4 site and hydroxyl respectively behave as cofactor and amino acid of the enzymatic pocket to interact with adsorbates, regulating nanozyme activity and inhibition. This mechanism involving dual sites is similar to that of thyroid peroxidases, which enables specific inhibition of CuNC-OH by antithyroid drugs. Based on these findings, a nanozyme-assisted drug discovery kit is established to analyze inhibition features of thyroid peroxidase inhibitors and screen out promising antithyroid drugs with a significant cost reduction compared with traditional enzyme kits.
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Nature Chemical Biology
·
2025
·
IF 13.7
Yao Shunyu,Xie Shengling,Liu Run-Zhou,Huang Zilei,Zhang Lihan
Modular polyketide synthases biosynthesize structurally diverse natural products by a set of catalytic domains that operate in an assembly line fashion. Although extensive research has focused on the rational reprogramming of modular polyketide synthases, little has been attempted to introduce noncanonical catalytic reactions on the assembly line. Here, we demonstrate the insertion of a thioester reductase domain, which can generate a terminal alcohol group instead of the canonical carboxylic acid, onto the assembly line polyketide synthases. We show that the didomain insertion of the acyl carrier protein and thioester reductase pair is generally effective for engineering of various polyketide synthase pathways. As a proof of concept, stereoselective and stereodivergent bioproduction of non-natural diols, namely, 1,3-butanediols and 2-methyl-1,3-butanediols, is achieved by harnessing the modularity of polyketide synthases. Our study expands the catalytic versatility of modular polyketide synthases and paves the way toward biosynthesis of designer alcohols.
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