CARBOHYDRATE POLYMERS
·
2023
·
IF 11.2
Lingyu Zhao,Xiaowei Ding,Imran Mahmood Khan,Lin Yue,Yin Zhang,Zhouping Wang
Curcumin (Cur) is a natural pigment with excellent biological activity. The poor stability and insolubility of Cur in water severely limit its application. Therefore, to overcome these dilemmas which are big hindrances in their application, a novel derivative (COCS-Cur) was prepared by the esterification reaction of carboxylated chitosan (COCS) and Cur. The structure and properties of conjugate were determined through a series of characterizations. The derivatives had excellent solubility as well as stability. In addition, antioxidant and photodynamic antibacterial experiments proved that COCS-Cur had the excellent free radical scavenging ability and photodynamic antibacterial activity . The derivatives presented a better antibacterial effect on Staphylococcus aureus ( S. aureus ) than Escherichia coli ( E. coli ). Noteworthy, the COCS-Cur derivatives showed no obvious toxicity which makes them a stronger contender and potential antimicrobial agent or functional nutrient for application in the food industry.
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AICHE JOURNAL
·
2023
·Vol. 69
·期 7
·e18080
·
IF 3.7
Zhikai Liu,Mei Yang,Zhengya Dong,Chaoqun Yao,Guangwen Chen
A facile and robust ultrasonic micromixer was developed to intensify antisolvent precipitation via ultrasonic cavitation. The gas supersaturation created from solvent–antisolvent mixing was found to be a novel driving force which facilitated the generation of cavitation bubbles (CBs). Instead of being attached on the channel wall, numerous CBs translated across the microchannel at a speed up to 1.7 m/s, inducing intense transverse flow over the cross-section. The unique cavitation behavior enabled rapid mixing (mixing time 15–45 ms at 30 W) of solvent–antisolvent over wide Reynolds number range (70–500) and flow rate ratio (5:1–2:3), providing better operability for antisolvent precipitation. The effects of ultrasonic power, total flow rate, flow rate ratio, and solvent on cavitation behavior and mixing performance were quantitatively studied. Finally, the potential of the ultrasonic micromixer as a new tool for antisolvent precipitation was demonstrated by synthesizing size-controllable and monodisperse polymeric nanoparticles in a high-throughput and reproducible manner.
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International Journal of Bioprinting
·
2023
·
IF 8.4
Shuyan Zhao,Bo Zeng,Rui Pei,Xiaoli Fu,Meinan Zhu,Guangya Zhang,Wei Jiang
As an environmental pollutant, formaldehyde can cause serious harm to the human body. Among many degradation methods, formaldehyde dehydrogenase from Pseudomonas putida (PFDH) exhibits broad potential because of its strong catalytic specificity and high degradation efficiency. However, the real application of PFDH in industry is limited by its instability and difficulties in recycling. In this work, the suitable printing conditions for immobilizing PFDH by three-dimensional (3D) printing technology were studied: the concentration of sodium alginate (SA) was 1.635 wt%, the concentration of CaCl 2 was 7.4 wt%, the crosslinking time with CaCl 2 was 8 min, and the temperature of the reaction was 31.5°C. 3D-printed PFDH/calcium alginate (CA) microspheres have 210% relative enzyme activity after seven repeated uses. Dried PFDH/CA particles were characterized by scanning electron microscope (SEM), Fourier transform infrared spectrometer (FT-IR), EDS elemental mapping, and thermogravimetric analysis (TGA) which proved that the enzyme was immobilized by the material. In addition, the recycling ability of 3D printing to immobilize different objects was explored and different shapes were designed by computer-aided design (CAD). In conclusion, 3D printing technology was applied to immobilize PFDH in this work, which provides a new idea to biodegrade formaldehyde in a green way.
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ADVANCED FUNCTIONAL MATERIALS
·
2023
·Vol. 33
·期 19
·2213545
·
IF 19
Yilei Wang,Hao Liu,Hui Xie,Shaobing Zhou
Wearable flexible electronics that are derived from hydrogels inevitably undergo dehydration, and the sensing performance is highly affected because the stretchability and conductivity weaken. Monitoring the water retention rate of hydrogels as they operate without dismantling the assembled sensing device is vital for evaluating sensing performances and intervening in a timely manner to address the problem. However, relevant research is still lacking. Herein, an autofluorescent hydrogel is engineered based on clusterization-triggered emission (CTE) for wearable strain-sensing electronics that can undergo self-visualizing dehydration. The fluorescence intensity of the CTE-type autofluorescent hydrogel depends on the aggregation level of molecule clusters that are dangled on the gel networks, which is dominated by the water retention rate of the hydrogel. Thus, the dehydration process can be reflected by the fluorescent images taken in a scenario of long-term strain-sensing. This strategy helps the operator evaluate the water retention rate of the hydrogel without removing it from the assembled electronics and then quickly address the problem. In addition, this strategy is also applicable for dehydration-tolerant systems, demonstrating the versatility of the autofluorescent hydrogel. Overall, the CTE-type autofluorescent hydrogel will promote the development of high-performance and smart wearable electronics.
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Xiaopeng Xiong,Yugang Wang,Chengtang Zhong
Lately, membrane with asymmetric properties of its two sides has shown promising potential in direct contact membrane distillation (DCMD) application, based on the fact that the hydrophilic side of the asymmetric membrane can effectively mitigate wetting and fouling, while the hydrophobic layer facilitate transportation of water vapor to realize separation. We here report an asymmetric membrane prepared via a facile method of vapor induced phase separation (VIPS). Namely, hydrophobic polymer of poly(styrene- block -butadiene- block -styrene) (SBS) and hydrophilic cellulose acetate (CA) were co-dissolved in tetrahydrofuran , and then cast in an ethanol vapor atmosphere to evaporate solvent. After solvent evaporation (within 10 min), the obtained membrane was observed with scanning electron microscope (SEM) to indicate even microstructure of porous network matrix with nodular morphology, and its top surface consisted of SBS only, while microspheres of CA were found to be evenly embedded in the SBS matrix at the bottom side layer. The membrane was further treated with NaOH aqueous solution for CA deacetylation, which was confirmed by attenuated total reflection Fourier transform infrared spectroscopy , SEM and water contact angle (WCA) analyses. The deacetylated CA exposes OH groups to decrease the WCA of the bottom surface greatly. As a result, an asymmetric membrane with large difference in WCA between the top surface and the bottom surface has been obtained. The asymmetric membrane was employed for DCMD to separate an oily saline emulsion containing n -hexadecane, surfactant of Tween 80, and NaCl . The stable flux and high salt rejection of the asymmetric membrane indicate excellent resistance to wetting and fouling, which is attributed to the hydration layer formed by the OH groups of the deacetylated CA at the bottom surface of the membrane. The facile strategy reported in this work implies possible large scale production of the asymmetric membrane that is suitable for membrane distillation application.
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JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yanrui Wang,Hailin Chang,Shu Jiang,Jialong Chen,Jinlong Wang,Heng Liang,Guibai Li,Xiaobin Tang
The interfacial polymerization (IP) plays a fundamental role in the fabrication of polyamide (PA) nanofiltration (NF) membranes with high ion selectivity and water permeability, which has enormous value for the increasing permeate quality and production in desalination. Herein, this study adopted a weak-polar organic solvent of ethyl formate (EF) to effectively regulate the IP process between piperazine (PIP) and trimesoyl chloride (TMC). The engineered PA separate layer conferred a uniform and ultrafine pore size (∼0.195 nm), exhibited a precise solute separation, and maintained a desirable permeability (18.4 ± 0.9 L m −2 h −1 bar −1 ). Molecular dynamics (MD) simulation indicated that EF involvement would significantly reduce the interfacial tension to motivate a fast and abundant diffusion of amine monomers from the aqueous phase into organic phase during the IP reaction, contributing to engineering a PA film with higher crosslinking degree. The optimized PA NF membranes conferred a more efficient rejection for divalent anions and cations (e.g., 99.5% for Na 2 SO 4 and 98.8% for MgCl 2 ). Remarkably, the membrane endowed a fairly high mono/divalent ion selectivity at sub-angstrom size, such as 145 for Cl − /SO 4 2− and 61 for Na + /Mg 2+ . The outstanding NF performance successfully broke the "trade-off" bound of perm-selectivity and was superior to the most "state-of-the-art" NF membranes. Overall, the co-solvent based IP strategy was beneficial to developing high-performance NF membranes without any significant changes to the existing fabrication process, and its facile and cost-effective merits were full of significance to the membrane manufacture.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2023
·
IF 9.9
Chenghan Yang,Chunfeng Mao,Qinghua Deng,Yong Yang,Yuming Zhou,Yiwei Zhang
Covalent organic frameworks (COFs) are excellent candidates for rationally designed metal-coordinated catalysts due to their porous structures and adjustable organic building blocks. In this work, a two-dimensional (2D) COF with novel fxt topology was synthesized. The newly devised COF had been fully characterized by a range of spectroscopic and microscopic techniques. The COF was further metallized by the gold species to form a heterogeneous catalyst that enabled the one-pot synthesis of flavone and its derivatives. The [email protected] catalyst showed high catalytic activity and good recyclability. This work demonstrates the great potential of metallized COFs with unique well-defined pores in organic catalysis.
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Journal of Materials Chemistry B
·
2023
·Vol. 11
·期 16
·3713-3726
·
IF 7
Qiao Bian,Chao Guo,Shuquan Cui,Jia Liu,Guohua Xu,Wei Feng
Bone tissue engineering, as an important and attractive multidisciplinary field, affords a feasible strategy for large bone defects which are difficult to heal without clinical intervention. However, the complicated requirements of bone regeneration result in the imperfect performance of many current materials. Inspired by the composite nature of bone tissues, we proposed an organic–inorganic composite strategy. Specifically, we loaded a bone regeneration drug (simvastatin, SIM) and an inorganic component (strontium hydrogen phosphate (SrHPO4)/beta-tricalcium phosphate (β-TCP)) to a thermogel, constituted by poly(ε-caprolactone-co-D,L-lactide)–poly(ethylene glycol)–poly(ε-caprolactone-co-D,L-lactide) (PCLA–PEG–PCLA), with a thermo-induced sol–gel transition, to prepare an injectable composite for bone regeneration in cranial defects. The SIM/(Sr/β-TCP)/PCLA–PEG–PCLA composite was able to be conveniently injected and it spontaneously filled the defect. The appropriate mechanical strength obtained by thermogelation under the stimuli of the body temperature provided the necessary support while the capacity of loading drugs and bioceramics offered bioactivity and osteoinduction. In vitro drug release experiments demonstrated a gentle and sustained release of SIM for as long as 2 months, benefitting bone regeneration. The excellent capacity of promoting the formation of osteocytes was proved by cell differentiation assays. Furthermore, the enhanced bone regeneration capacity was verified by the micro-CT results of rat cranial defects with implantation time. Based on our results, the organic–inorganic composite integrates the advantages of each component and is far beyond, thus it might serve as a promising material candidate for bone regeneration.
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ACS Sensors
·
2023
·
IF 8.9
Wei Liu,Zihan Wang,Zhongping Liu,Junxue Chen,Lingyan Shi,Longjin Huang,Yu Liu,Sheng Cui,Xuan He
The surface-enhanced Raman scattering (SERS) technique is a promising method for the detection of explosives such as 2,4,6-trinitrotoluene (TNT) and 3-nitro-1,2,4-triazol-5-one (NTO) because of its high sensitivity to trace substances. However, most SERS detection processes are often nonautomated as well as exhibit low efficiency and toxic exposure, which often poses potential danger to operators. Herein, we propose the integration of SERS with digital microfluidics (SERS-DMF) for automated, high-throughput, and high-sensitivity detection of explosives. First, we carefully designed a DMF chip comprising 40 drive electrodes and 8 storage electrodes to achieve a high-throughput process. And different concentrations of target molecules, silver nanoparticles (Ag NPs), and salts were loaded into the DMF chip. Then, the droplet aggregation, incubation, and detection processes were automatically controlled using the SERS-DMF platform. In addition, Ag NPs were efficiently aggregated by screening different types and concentrations of salts, resulting in “hotspots” and the SERS effect. With the help of the SERS-DMF platform, two explosive samples were automatically detected with high throughput and high sensitivity. The detection limits of TNT and NTO were 10–7 and 10–8 M, respectively. In addition, compared with nonautomatic operations, the SERS-DMF platform exhibited better reproducibility and higher efficiency for the detection of explosives. The proposed SERS-DMF thus has considerable potential as an analytical technique for detecting hazardous substances.
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Catalysts
·
2023
·Vol. 13
·期 3
·628
·
IF 3.9
Qiuwen Liu,Yuhua Zhang,Yawei Wu,Mingxia Song,Caijin Huang
Coal is a readily available and inexpensive material. However, its direct use as a catalyst is still rare, but attractive for practical application. In this paper, coal was directly used as a catalyst for the selective oxidative dehydrogenation of propane to propene. It exhibited a high selectivity over 90% with a yield of 8.4% at a high space velocity (12,000 mL·(h·g-cat)−1). The productivity up to 2.84 gC3H6gcat−1h−1was obtained with propene selectivity above 80% (20,000 mL·(h·g-cat)−1). The kinetic showed first-order dependence with respect to propane or oxygen partial pressures. Meanwhile, electron paramagnetic resonance (EPR) and X-ray photoelectron spectrum (XPS) demonstrated that the carbonyl groups act as active sites for oxidative dehydrogenation of propane to propene. This work expands the use of earth-abundant and low-price coal in catalysis with expectable scale application.Keywords:coal;catalysis;kinetics;oxidative dehydrogenation;propane;propene
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Small
·
2023
·Vol. 19
·期 38
·2303321
·
IF 13.3
Qi Li,Liangmei Luo,Chenqi Xu,Shizhu Song,Yanqing Wang,Lifang Zhang,Yanfeng Tang,John Texter
Metal–nitrogen–carbon (M–C/N) electrocatalysts have been shown to have satisfactory catalytic activity and long-term durability for the oxygen reduction reaction (ORR). Here, a strategy to prepare a new electrocatalyst (Fe&Pd–C/N) using a unique metal-containing ionic liquid (IL) is exploited, in which Fe & Pd ions are positively charged species atomically dispersed by coordination to the N of the N-doped C substrate, C/N. X-ray absorption fine structure, XPS and aberration-corrected transmission electron microscopy results verified a well-defined dual-atom configuration comprising Fe +2.x –N 4 coupled Pd 2+ –N 4 sites and well-defined spatial distribution. Electronic control of a coupled Fe–Pd structure produces an electrocatalyst that exhibits superior performance with enhanced activity and durability for the ORR compared to that of commercial Pt/C (20%, Johnson Matthey) in both alkaline and acid media. Density functional theory calculations indicate that Pd atom can enhance the catalytic activity of the Fe active sites adjacent to Pd sites by changing the electronic orbital structure and Bader charge of the Fe centers. The excellent catalytic performance of the Fe&Pd–C/N electrocatalyst is demonstrated in zinc–air batteries and hydrogen–air fuel cells.
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Reaction Chemistry & Engineering
·
2023
·Vol. 8
·期 8
·2011-2021
·
IF 3.9
Wang Yingshu,Wang Hong,Tang Yixin,Shu Yu,Zhao Suying,Hong Lu,Xu Zhenqi
Electrochemical ammonia synthesis has advantages over the conventional Haber–Bosch process in terms of environment friendliness, sustainability, and cleanliness. However, this process is facing challenges such as low ammonia yield and low Faraday efficiency due to the low solubility and the difficulty in activation of nitrogen in aqueous solutions. To overcome these limitations, finding a catalyst of high efficiency, stability, and selectivity is crucial. Inspired by the concept of noble metal doping and two-dimensional layered catalysts, we have designed a novel catalyst for nitrogen reduction by incorporating ruthenium into lanthanum sulfide. In this context, the inclusion of ruthenium serves to optimize the electron transfer interface, enhance the low conductivity of lanthanum sulfide, and increase the number of active sites. Furthermore, the synergistic effect between the ruthenium and lanthanum ions significantly improves the activity of the catalyst. As a catalyst for the N2 reduction reaction (NRR), Ru/La2S3 demonstrates a superior NH3 formation rate of 19.40 μg h−1 mgcat−1 and a faradaic efficiency of 7.77% at −0.5 V versus the reversible hydrogen electrode (RHE). These values are significantly higher compared to those of La2O3 (1.4%; 12.5 μg h−1 mgcat−1) and La2S3 (2.3%; 10.7 μg h−1 mgcat−1), and most reported values in this field.
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