PHYSICAL CHEMISTRY CHEMICAL PHYSICS
·
2017
·Vol. 19
·期 9
·6626-6635
·
IF 4.123
Yuanyuan Zhou,Hui Tang,Peiyi Wu
Temperature-induced phase transition together with the liquid–liquid phase separation (LLPS) phenomenon of poly(oligo(2-isopropyl-2-oxazoline)methacrylate) with the comb-shaped architecture (comb-PiPOx) in aqueous solution has been discussed at the molecular level. Differing from linear poly(2-isopropyl-2-oxazoline) (linear-PiPOx), polymer-rich liquid droplets appear at higher temperature compared with the phase transition determined by differential scanning calorimetry (DSC) in comb-PiPOx solution. As investigated using variable-temperature Fourier transform infrared (FTIR) spectra analysis, the densely grafted architecture gives rise to an intra-molecular interaction (hydrophobic interaction of alkyl groups and H-bond of carbonyl groups) dominating the dehydration process of comb-PiPOx. With temperature increment, most of the water within hydrated polymers is expelled to the outer water phase through intra-molecular association, corresponding to the transition temperature. Afterwards, the dehydration of methyl groups on side chain ends reflects the massive aggregation of polymer chains through inter-molecular association, accompanied by hysteretic LLPS.
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NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 34
·15629-15636
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IF 3.591
Bin Wang,Yuzhe Zhang,Wen Sun,Xudong Zheng,Zhongyu Li
The recycling of rare-earth elements from wastewater has important economic and environmental benefits. In this study, cellulose nanocrystals used as a liquid crystal template and tetraethyl orthosilicate (TEOS) used as a silicon-source precursor drive were self-assembled into thin-film materials via a sol–gel method, and then calcined into carbon-based materials at high temperatures in a nitrogen atmosphere to improve the mechanical properties of the films and increase surface areas. The 3-aminopropyl triethoxysilane and 1-(2-pyridylazo)-2-naphthol were introduced into the surface of carbon-based thin-film materials by chemical grafting to improve the adsorption properties of rare-earth elements. For heavy rare-earth ions, the adsorption performance of the carbon-based silicon membrane was better as compared to the light rare-earth ions. At pH = 7, the maximum adsorption capacity of the carbon-based silicon membrane and the adsorption efficiency can reach more than 90%. The regeneration performance test indicated that the carbon-based silicon membrane can be reused many times. In general, it is an environmentally friendly, efficient, and non-toxic new adsorption material for heavy rare-earth ion adsorption.
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JOURNAL OF CHEMICAL THERMODYNAMICS
·
2022
·
IF 3.269
Pan Zhang,Yanxi Ji,Wenya Li,Lihua Xu,Lemeng Wang,Dong Fu
The viscosities of N -(2-aminoethyl)ethanolamine (AEEA), 1,4-butanediamine (BDA) and N-methyl- 1,3-propane- diamine (MAPA) activated 2- diethylaminoethanol (DEAE) aqueous solutions were measured at temperatures ( T ) from 303.2 K to 323.2 K, respectively. The DEAE mass fractions ( w DEAE ) and the other three amines ( w AEEA / w BDA / w MAPA ) are 0.300 to 0.500 and 0.050 to 0.150 respectively. The Weiland equation was used to calculate the viscosity of these three solutions, and the calculation results were satisfied with data of the experimental results. With the aid of experimentally determined viscosity data, the activation energy ( E a) of these three solutions was predicted through the Arrhenius formula. With the help of the viscosity data and the diffusion coefficient model of CO 2 in water, the CO 2 diffusion coefficient ( D CO2 ) in these three solutions was calculated. The quantitative relationship between the calculated values (viscosity, activation energy and diffusion coefficient) and the operation conditions (solution mass fraction and temperature) was analyzed. Our results show that the DEAE-BDA absorbent has better application potential due to its lower viscosity, higher CO 2 diffusion coefficient and lower activation energy.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Liye Shuai,Qun Li,Jia Liu,Jiabin Wu,Xinning Huang,Jianglong Yu,Jinxiao Dou,Huaiguang Li,Xingxing Chen
The rational design of efficient photoanodes is essential for advancing solar-driven water oxidation. This study addresses the intrinsic challenges of bismuth vanadate (BiVO 4 ), such as sluggish charge kinetics and severe surface recombination, through the construction of a ternary composite photoanode via synergistic interfacial modification and cocatalyst integration. A hierarchical architecture was fabricated through sequential low-temperature chemical bath deposition and electrodeposition, integrating a CoFe-layered double hydroxide (CoFe-LDH) interlayer and nickel-hydroxynitrate (Ni 2 (NO 3 ) 2 (OH) 2 ) onto BiVO 4 substrates. The optimized BiVO 4 /CoFe-LDH@Ni 2 (NO 3 ) 2 (OH) 2 photoanode achieves a photocurrent density of 5.57 mA/cm 2 at 1.23 V vs. reversible hydrogen electrode (V RHE ) under Air Mass 1.5 Global (AM 1.5G) illumination, accompanied by a 251 mV cathodic shift in onset potential. Comprehensive characterizations-including X-ray photoelectron spectroscopy (XPS), open-circuit photovoltage (OCP) decay, time-resolved photoluminescence (TRPL) decay, electron paramagnetic resonance (EPR) and Kelvin probe force microscopy (KPFM)-reveal that the oxygen vacancy (O v )-rich CoFe-LDH@Ni 2 (NO 3 ) 2 (OH) 2 layer facilitates efficient charge transfer within BiVO 4 and generates a pronounced built-in electric field, thereby significantly enhancing interfacial charge separation. Concurrently, density functional theory (DFT) calculations demonstrate that the interfacial effect of CoFe-LDH@Ni 2 (NO 3 ) 2 (OH) 2 substantially lowers the thermodynamic barrier for the oxygen evolution reaction (OER). This study offers fundamental insights for fabricating high-efficiency BiVO 4 -based photoanodes.
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Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2009
·
IF 0.72
Penghui Li,Chenyi Wang,Guang Li,Jianming Jiang
A series of novel fluorinated poly(aryl ether amide)s(PEAs) were prepared from an aromatic diamine containing trifluoromethyl group (─ CF3), 1,2-bis(4-amino-2-trifluoromethylphenoxy)benzene(Citation1),with various aromatic dicarboxylic acids using the phosphorylation polycondensation. The fluorinated PEAs were obtained in almost quantitative yields with inherent viscosities ranging from 0.55 to 0.78 dl/g. All the PEAs showed high solubility in many polar organic solvents such as N-methyl-2-pyrrolidinone (NMP), dimethyl sulfoxide (DMSO) and tetrahydrofuran (THF) and so on. Flexible and tough polymer films could be easily prepared by casting from DMAc solvent. The PEAs films exhibited high optical transparency with a cutoff wavelength of 336–357 nm and good mechanical properties with tensile strengths of 78.4–104.8 MPa and elongations at break of 5.4–10.3%. They showed high glass transition temperatures in the range of 227–244°C. They also exhibited good thermal stability, the 10% wt loss temperatures from 453 to 464°C in nitrogen atmosphere. Meanwhile, the obtained PEAs films possessed low dielectric constants of 2.42–2.80 at 1 MHz and low moisture absorption (1.27–2.36%). Due to their properties, the polyamides could be considered as engineering microelectronic and photoelectric materials.
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SYNTHESIS-STUTTGART
·
2019
·Vol. 51
·期 17
·3221-3230
·
IF 2.867
Wei Sun,Mingjuan Zhang,Peilang Li,Yiqun Li
A novel and highly efficient one-pot synthesis of polysubstituted imidazoles from α-hydroxyphenylacetic acids, diphenylacetylene, and amines has been achieved by Pd(OAc)2/Ce(SO4)2/Bi(NO3)3 trimetallic catalytic system. A series of control experiments showed that this overall reaction occurs through a one-pot cascade process combining the steps of decarboxylation of α-hydroxyphenylacetic acids, Wacker-type oxidation of diphenylacetylene, and Debus–Radziszewski annulation of aryl aldehydes and benzil generated in situ, as well as amines. This reaction represents a novel multicomponent reaction using α-hydroxyphenylacetic acids and diphenylacetylene as sources of aryl aldehydes and a β-diketone. This process exhibits a broad substrate scope and a good functional group tolerance to assemble the corresponding polysubstituted imidazoles in excellent yields (72–88%) under mild conditions.
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DALTON TRANSACTIONS
·
2025
·
IF 3.3
Taozhu Li,Yu Liang
The application of NiTi alloys in the electrooxidation of urea is primarily based on their unique electrochemical activity and stable chemical properties. It has been found that during electrochemical cyclic voltammetry treatment, a Ni(OH)2 layer with high catalytic activity can be formed on the surface of NiTi alloys, which significantly enhances the efficiency of urea electrooxidation. Electrochemical studies reveal that NiTi@Ni(OH)2 exhibits voltage-dependent selectivity between urea oxidation and water oxidation. When the applied potential is less than 1.47 V, the electrode undergoes urea oxidation; in contrast, when the applied potential exceeds 1.54 V, the electrode reaction switches to water oxidation. That is, the selectivity between urea oxidation and water oxidation can be achieved by adjusting the applied potential, which provides a new approach for the selectivity control of electrochemical reactions.
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Microorganisms
·
2026
·Vol. 14
·期 2
·322
·
IF 4.2
Yifan Chen,Li Zhang,Yan Chen,Wenpei Ge,Hongling Wang,Zhanying Xue,Xinran Cui,Xin Wang,Aimei Liao,Yuansen Hu,Na Liu
Fusarium solani , a widely distributed plant pathogenic fungus, poses a significant threat to various crops due to its complex pathogenic mechanisms and being difficult to control. In this study, LC–TOF–MS analysis identified 4-(4-hydroxyphenyl)-2-butanone (RK) as a metabolite detected in Bacillus amyloliquefaciens strain M1, and a commercially available RK standard was subsequently used to evaluate its antifungal activity against F. solani . Antifungal assays demonstrated that RK effectively suppressed fungal growth. Further physiological and biochemical assays confirmed that RK disrupts the cell membrane and mitochondrial function, leading to intracellular reactive oxygen species (ROS) accumulation. This study offers new perspectives on the antifungal mechanism of RK and offers theoretical support for the development of innovative agricultural disease management strategies.
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SENSORS AND ACTUATORS B-CHEMICAL
·
2026
·
IF 8.3
Yue-Yang Zhang,Zi-Xin Chen,Gang Nie,Huiling Wang,Qiaolin Li,Shi-Yu Liu
Bio-activated esters containing a functional alcohol and an acid moiety as recognition unit have emerged in bioimaging and drug discovery. When the alcohol moiety is designated as an imaging dye or a drug, disease-related enzyme activity can be visualized, or the drug can be delivered to disease lesions with aberrant enzyme expression. However, although the carboxylic acid moiety is co-delivered to enzyme-overexpressing sites along with the alcohol part, the leaving acid groups are typically non-functional. Therefore, we sought to develop a dual-functional ester design platform by incorporating a biologically active acid with functional alcohol moieties. In this study, we selected carboxylesterase 2 (CES2) as the target enzyme and first proposed aspirin-based esters as a potential CES2-targeting scaffold. A prototype compound ( HFC-AS ) was initially constructed and characterized as a dual-functional ester, which exhibited high sensitivity and specificity for CES2 sensing and significantly improved antitumor efficacy compared to the combined addition of HFC-OH and aspirin. Subsequently, an aspirin-based fluorescent probe ( DDX-AS ) was developed, displaying an ultrafast reaction rate toward CES2 while maintaining high sensitivity and selectivity. Consequently, CES2 activity in living systems could be rapidly detected with high specificity, enabling imaging of both subcutaneous transplanted and pulmonary metastatic melanoma. Furthermore, an aspirin-based prodrug ( SN-38-AS ) was developed and demonstrated a higher tumor growth inhibition rate (98%) than the clinically used prodrug irinotecan (89%), while also exhibiting an improved safety profile. Collectively, a new strategy for CES2-targeted bioimaging and drug delivery was proposed and evaluated, showing great potential for disease diagnosis and drug development.
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BioDesign Research
·
2025
·
IF 4.7
Peiling Wu,Haofeng Chen,Guojun Yang,Haoyu Qin,Qian Zhang,Yuxin Chen,Dongjiang Lin,Yang Zhang,Shuyong Lin,Shizhen Wang,Jifeng Yuan
2-Hydroxyisovalerate (2-HIV) is a value-added chemical that is widely applied in the synthesis of bioactive compounds and polymers. Here, we report an underexplored metabolic route for the de novo production of S -type 2-HIV ( S -HIV) in Escherichia coli . In particular, we identified promiscuous activity of 4-hydroxymandelate synthase (HmaS) from Amycolatopsis orientalis towards the conversion of 2-keto-4-methyl-pentanoate (2-KMP, an immediate precursor for L-leucine) to S -HIV. Next, we designed a variant HmaS (S201F) with abolished activity for mandelate and 4-hydroxymandelate synthesis, thereby minimizing byproduct formation. Coupled with systematic optimization of the L-leucine biosynthetic pathway, we achieved de novo production of S -HIV at 8.1 mM (0.95 g/L) in shake flasks and 33.9 mM (4.0 g/L) in 2-L fed-batch fermentation. In summary, this work represents the first time to realize the efficient synthesis of S -configuration 2-HIV in metabolically engineered E. coli .
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Zhifeng Wang,Hongliang Fu,Shaocong Zhan,Yue Lian,Jing Zhao,Huaihao Zhang
Electrolysis of water to produce hydrogen and oxygen is a crucial approach for achieving zero-carbon emissions and sustainable energy conversion. However, due to the slow kinetics of anode oxygen evolution reaction (OER), the hydrogen and oxygen evolution efficiency are reduced. Here, we synthesized a non-precious metal bifunctional catalyst (NF@CN), self-supporting nickel foam (NF) compounded with carbon-nitrogen (CN) for water electrolysis. Specifically, through the coordination effect between 2-methylimidazole N lone pair electrons and Ni 3d vacant orbitals, a ligand layer forms on NF surface. After high-temperature carbonization, 2-methylimidazole evolves into CN layer. From density functional theory (DFT), NF@CN exhibits good conductivity. Moreover, the introduced CN not only enhances the non-metallic active sites, but also promotes NF acid-base resistance. As a result, self-supporting electrode NF@CN-10 requires just 309 mV and 288 mV overpotential for OER and hydrogen evolution reaction (HER) respectively to achieve 50 mA cm −2 current density. Also, the NF@CN-10 electrolytic cell displays small battery voltage of 1.83 V at 50 mA cm −2 current density and 200 h long stability.
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ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Zhongjie Fei,Ping Liu,Chu Cheng,Rongbin Wei,Pengfeng Xiao,Youfa Zhang
Although numerous approaches were proposed for the nucleic acid (NA)-based SARS-CoV-2 detection, the nonideal NA desorption efficiency of conventional magnetic beads (MBs) limits their widespread application. In this study, we developed solvent-responsive MBs (called responsive MBs), which, in the presence of buffers, modulated the absorption and desorption capacities of NA by flipping the surface −COO–. Relative to other commercial MBs, responsive MBs exhibited similar absorption profiles and markedly enhanced desorption profiles. When applied for NA detection of complex samples, responsive MBs exhibited better performance of RNA detection than DNA, with obvious advantages in sensitivity. Specifically, the RNA and DNA desorption rates of commercial MBs were ∼85 and 82.5%, while those of responsive MBs were nearly 94 and 93.5%, respectively. Furthermore, responsive MBs exhibited remarkable extraction ability in a wide range of tissues and better performance of RNA extraction than DNA. When applied for SARS-CoV-2 detection, the responsive MBs along with the simulated digital RT-LAMP (a previously established apparatus) further improved detection efficiency, yielding a precise quantitative detection as low as 25 copies and an ultimate sensibility detection of 5 copies/mL. It was also successfully employed in numerous NA-based technologies such as polymerase chain reaction (PCR), sequencing, and so on.
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