ACTA PHYSICO-CHIMICA SINICA
·
2024
·
IF 10.8
Ping Ye,Lingshuang Qin,Mengyao He,Fangfang Wu,Zengye Chen,Mingxing Liang,Libo Deng
With the growth of batteries, electroplating, and mining industries, heavy metal ions such as cadmium (Cd 2+ ) are being discharged on a massive scale, thus posing a severe threat to the environment. Conventional techniques for removing Cd 2+ from wastewater with low concentrations still suffer from slow kinetics and secondary pollution. A carbon-based capacitive deionization (CDI) system is highly desired but encounters a severe co-ion expulsion effect. Herein, we developed CDI systems based on surface charge-modulated porous carbon and an asymmetric configuration. This was achieved by first preparing porous carbons through facile microwave pyrolysis of lotus leaf followed by KOH activation. The morphology, pore structure, heteroatom content, surface charge, and electrochemical behavior of porous carbons were investigated by adjusting the mass ratio of KOH to carbon. The lotus leaf-derived carbons show a morphology of nanosheet-like thin carbon (NSTC), with their specific surface areas increasing with the amount of KOH used for activation. In contrast, the heteroatom ( i.e ., nitrogen and oxygen) contents decrease with the increase in the mass ratio of KOH to carbon, resulting in a more positive surface charge. Notably, the NSTC with a mass ratio of 3 for KOH/carbon (NSTC-3) displays an ultrahigh specific surface area of 3705.0 m 2 g −1 , and a specific capacitance of 92.5 F g −1 at a current density of 0.5 A g −1 when coupled with a commercial activated carbon in an asymmetric YP-50F//NSTC-3 supercapacitor. Consequently, the CDI cell equipped with a YP-50F as the anode and a NSTC-3 as the cathode exhibits a high specific adsorption capacity of 88.6 mg Cd ·g cathode −1 at 1.2 V in a 100 mg L −1 Cd 2+ solution, which is about 36.3 % higher than that of the symmetrical configuration NSTC-3//NSTC-3. Furthermore, 71 % of the initial removal capacity of the YP-50F//NSTC-3 system is retained after 7 cycles of charging and discharging. Characterizations of the cathode after the adsorption process indicate that the Cd 2+ is captured by both electrical-double-layer and pseudocapacitive mechanisms. Additionally, CdCO 3 precipitate is also responsible for Cd 2+ removal, which might be ascribed to the reaction of dissolved CO 2 in aqueous media with Cd 2+ under the electrified action. The high removal performance and excellent cycling stability are attributed to the tunability of the surface charge properties and the asymmetric configuration, which minimizes the co-ion expulsion and modulates potential distribution. This study provides a novel avenue to design biochar-based configurations for electrified water treatment.
研究领域:
环境科学
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材料科学
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Hao Yang,Yuantao He,Zhongqiang Wu,Jing Miao,Fang Yang,Zhong Lu
Superhydrophobic metal coatings have been extensively studied in recent years because of their significant potential applications. Unfortunately, most of them lost the original metallic luster due to the micro/nano binary structures. In this paper, a facile method was developed to prepare a superhydrophobic and high-glossy copper coating on aluminum substrates. The bionic lotus leaf surfaces were constructed by electroless plating method and further modified with octadecanethiol. The wettability and gloss could be tuned by the concentration of the precursor. With the increase of CuSO 4 concentration, the surface roughness of the coating raised, thus resulting in increase of contact angle and decrease of glossiness. When the CuSO 4 concentration was 30 mmol/L, the coating exhibited a sub-micro/nano binary structure, in which 20–30 nm protuberances were grown on 300–500 nm mastoids. Such special morphology endowed the coating with superhydrophobic and high-glossy properties, and the coating also showed ultra-low water adhesion and stable dynamic water repellence.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2023
·Vol. 19
·期 50
·2304918
·
IF 13.3
Haotian Jiang,Chengjuan Wang,Bowen Cui,Xiaodan Xu,Mengfan Li,Zhenhao Xu,Hongxue Tan,Chengguo Wang,Yanxiang Wang
Developing composite materials with the synergistic effects of heterogeneous structures and multiple components is considered as a promising strategy to achieve high-performance electromagnetic wave (EMW) absorbers. To further satisfy the demand of broadband and strong microwave absorption, a novel NiS/carbon nanofibers (CNFs)/porous carbon composite is successfully synthesized by hydrothermal and chemical vapor deposition using lotus leaves as a biomass carbon source. A few carbon nanotubes (CNTs) and uniformly dispersed Ni nanocrystals have also been found in the hybrid. Benefiting from the porous structure derived from lotus leaves, the combination of dielectric NiS, conductive carbon nanomaterials, and magnetic Ni nanoparticles, together with the three-dimensional conductive network of CNFs and CNTs, the remarkable EMW absorption properties with a minimum reflection loss up to −67.65 dB have been achieved at merely 2.32 mm. Besides, the widest effective absorption band can reach 5.9 GHz with a thin thickness of 2.07 mm, covering almost the entire Ku band. In addition, under the incident angle of 31°, the radar cross-section reduction value of LNSF-600 can reach 42.88 dBm2. Therefore, this work provides an efficient and facile method for manufacturing outstanding biomass-derived EMW absorbers.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Bioscience
·
2024
·
IF 4.8
Shunqian Zhuang,Jun Cheng,Songting Chen,Yuliang Li,Dazhi Ding,Zhilong Yu,Yunfei Xie
Lotus leaf is a super-hydrophobic material found in nature. Drawing inspiration from the micro-nano structure of lotus leaf surface, a hybrid surface-enhanced Raman spectroscopy (SERS) substrate owning both hydrophobic and hydrophilic properties was developed. The biomimetic part, which was fabricated by replicating the surface structure of lotus leaf using polydimethylsiloxane, exhibited a hydrophobic surface with a contact angle of 150.3°. Meanwhile, silver nanoparticles-coated filter paper was assembled on the top of the biomimetic part to render hydrophilic regions for SERS detection. Silver nanoparticles on the surface of filter paper owned a size of approximately 70–80 nm with an interval of about 5–10 nm. The hydrophobic/hydrophobic hybrid regions on the substrate significantly enhanced Raman signals of rhodamine 6g with mitigated coffee ring effects, showing a limit of detection low to 10 −10 M. Notably, the limit of detection of this technique for thiram on apple surface reached 0.5 ng/cm 2 , which was lower than the reported methods. The prepared substrate displayed exceptional uniformity and stability, with an RSD value of 7.21% calculated based upon 30 randomly selected Raman signals, and experienced a decrease in signal by only 29.7% after 30-d storage. This biomimetic substrate can be utilized for batch detection of pesticide residues on fresh produce with high sensitivity, thereby owning great potential for application as a rapid detection tool for food safety.
研究领域:
分析化学
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食品安全
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Xiaolu You,Hongbo Wang,Jianxin He,Kun Qi
Waterproof and breathable microporous membranes with superhydrophobic properties have significant applications in numerous fields, including self-cleaning, outdoor protective equipment, and corrosion prevention. However, creating an environmentally friendly, fluorine-free, and waterproof breathable membrane (WBM) that offers excellent water resistance and durable superhydrophobic surfaces without post-coating technology remains a great challenge. Herein, we provide a facile and powerful method to fabricate a superhydrophobic, fluorine-free composite polyurethane (PU) WBM. This WBM is based on a corncob-like substrate membrane combined with a lotus-leaf-like surface layer with differing surface wettability; it is achieved via a two-step electrospinning and heat treatment technique. A corncob-like substrate membrane with excellent water resistance was prepared owing to its improved surface wettability and small pore size. It features a uniform hierarchical rough structure achieved by introducing appropriate SiO 2 nanoparticles (SiO 2 NPs) and two-component liquid silicone rubber (rPDMS) with low surface energy. In addition, a lotus-leaf-like skin layer with the presence of SiO 2 rough microspheres was introduced on a corncob-like membrane’s surface for imparting superhydrophobicity to the double-layer WBM. Importantly, rPDMS not only acted as a hydrophobic agent synergizing with SiO 2 NPs to enhance the wettability of the fiber surface from hydrophobic to superhydrophobic but also served as an adhesive to firmly fix SiO 2 NPs to the fiber surface. The resulting double-layer composite membrane exhibited excellent waterproofness of 93.3 kPa, moderate breathability of 5235 g m −2 d -1 , and durable self-cleaning properties, indicating its great potential for use in protective clothing and other applications.
研究领域:
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2024
·
IF 6
Chenlu Liu,Furong Xu,Qing Zhang,Nuo Xu,Jiaojiao Zhang,Yun Shi,Kunming Qin
Lotus leaf ( Nelumbo nucifera Gaertn.), extensively used in culinary and medicinal applications, is abundant in flavonoids and alkaloids with notable antioxidant and anti-inflammatory effects. This study utilized a response surface methodology to refine the extraction process of total flavonoids (TFs) from lotus leaf (LL) and to evaluate TF content across different sources in relation to antioxidant properties. Ethanol concentration, material-liquid ratio, enzyme dosage, enzyme digestion time, enzyme digestion temperature and ultrasonication time were analyzed through single-factor experiments to assess their impact on TF yield. The Box–Behnken design identified optimal extraction conditions. In vitro antioxidant activity of LL was measured via free radical scavenging assays. The optimized extraction parameters included an enzyme concentration of 30 mg/g, an ethanol volume fraction of 40% (v/v), a material-liquid ratio of 1:40 g/mL,a enzyme digestion time of 50 min, enzyme digestion temperature of 38°C and an ultrasonication time of 20 minutes. Extracts produced through ultrasound-assisted enzyme extraction demonstrated superior TF levels compared to conventional ultrasonic extraction and hot water extraction. Compared with the existing extraction methods, this experiment greatly improved the extraction rate of LL and further enriched the antioxidant activities of TF.
研究领域:
植物化学
·
药理学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2018
·
IF 5.089
Mengting Wang,Qing Shen,Lyulin Hu,Yaqin Hu,Xingqian Ye,Donghong Liu,Jianchu Chen
Lotus leaf flavonoids (LLF) are a group of bioactive natural substances. In this study, the structure, thermal properties, rheology behaviors and in vitro digestibility of cooked LLF-starch complex were investigated. Differential scanning calorimetry (DSC) analysis showed the shift in gelatinization peak to a higher temperature and the decrease in gelatinization enthalpies in the complexes significantly. The short-term retrogradation was retarded either. The flow behaviors of starch pastes changed with adding LLF. Scanning electron microscope (SEM) images showed a less compact structure in LLF-starch complex and laser confocal scanning microscope (CLSM) images detected that LLF mostly distributed around starch granules, which further prove the binding between LLF and starch. Moreover, fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) elucidated LLF probably interacted with starch by non-covalent bond especially hydrogen bond. In addition, LLF-starch complex exhibited inhibitory effect on starch digestion compared to pregelatinized starch, and the reasonable content of LLF-starch complex was (0.7 g/100 g). Thus, LLF-starch complex can be potentially used as a functional additive for high resistant starch (RS) and low glycemic index (GI) diets.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Hongyang Ma,Yuanyuan Xiang,Mengmeng Li,Haiyang Zhang,Xiaofeng Liu,Chao Wu,Shuqi Zhao,Xu Liu,Zhongjun Cheng,Yuyan Liu
Adhesives with switchable adhesion for both solids and liquids have become research frontier because of their broad application potential in fields such as biomedicine and soft grippers. However, these adhesives simultaneously achieving high adhesion modulation ratios for both solids and liquids remain challenge, because high surface free energy and large contact area make the adhesives lose the ability to control liquid adhesion. In this study, we integrated the adhesive concepts of the lotus leaf, gecko, and mesovelia to design a mechanically responsive adhesive surface (MRAS), which consists of a low adhesion background mesh (LABM) similar to lotus leaves and high adhesion pillar array that mimics geckos. Similar to the adhesion-regulating mechanism of mesovelia, this MRAS enables reversible adhesion switching by mechanically controlling the protrusion/retraction of pillars on the LABM. The MRAS can regulate adhesion force by altering the surface chemistry of pillars and the contact state between the pillars and solids/liquids. The MRAS can achieve high adhesion modulation ratios of 260 for solids and 105 for liquids, and can switch adhesion rapidly (less than 1 s) and efficiently. These capabilities allow the MRAS to manipulate various solids and liquids. Additionally, it enables the programmable control of solids and liquids. This research could provide new strategies for applying switchable adhesive surfaces in various fields.
研究领域:
材料科学
·
生物医学工程
·
仿生学
✓ 已验证
产品关联
DOI
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2022
·
IF 4.831
Zhengdong Zhu,Xiaoyi Shi,Yating Feng,Meng He,Cheng Ye,Hongyang Zhou,Maofeng Zhang,Wei Zhang,Jianhua Li,Changlong Jiang
Conventional surface-enhanced Raman scattering (SERS) molecular detection are based on hard and brittle substrate, which are not suitable for in-situ detection of analytes adsorbed on nonplanar surfaces. Here, we report a simple biomimetic synthesis method to fabricate lotus leaf mastoid structured AgNPs micro/nanoarrays as reliable SERS substrate. By ideal replicating mastoid structure of lotus leaf into a flexible and transparent PDMS film, followed by depositing plasmonic AgNPs, a powerful chemical sensor with high sensitivity and multiplex detecting capability is demonstrated. The employ of periodic mastoid structure array endows the sensor with high signal repeatability (RSD ∼ 8.6 %), solving the general repeatability problem of SERS substrates. In addition, the detailed designed flexible and transparent PDMS substrate is capable of identifying trace analytes on curved surfaces with excellent durability. In the proof-of-concept experiment, a limit of detection (LOD) of (10 −5 M to 10 −7 M) was achieved on a portable Raman device for three common pesticides residues (thiram, fonofos and triadophos) on dendrobium leaves and stem according to the molecular fingerprint, indicating its excellent in-situ detection capability. Further, the multiplex detection ability of the Ag/PDMS film is also demonstrated by analyzing the mixture of four typical analytes. Benefiting from its high signal uniformity, this flexible Ag/PDMS substrate also showed good quantitative detection capabilities.
研究领域:
材料科学
·
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2018
·Vol. 10
·期 23
·10963-10970
·
IF 7.233
Hui-Si Li,Jin Qu,Shu-Meng Hao,Zhen-Zhen Wang,Yu-Jiao Zhang,Zhong-Zhen Yu
The rapid capacity degradation of Ge-based materials hinders their practical application for next generation lithium ion batteries, which could be solved by synthesizing Ge-containing ternary oxides, with new structures and hybridizing with carbon nanomaterials. Herein, novel Ni3Ge2O5(OH)4 nanosheets were synthesized and distributed in situ on reduced graphene oxide (RGO) sheets, with both flat-lying and vertically-grown spatial distributions to imitate the growth of lotus leaves. These two types of Ni3Ge2O5(OH)4 nanosheets enhance their efficient contact with RGO, and increase the mass loading of active materials. Furthermore, the interfacial bonds between RGO sheets and Ni3Ge2O5(OH)4 nanosheets are introduced to improve the diffusion rate of lithium ions. The RGO sheets act as a buffer matrix to sustain the volume change and prevent the nanosheets from aggregation. Consequently, the chemically bonded Ni3Ge2O5(OH)4/RGO hybrid delivers a high specific capacity of 863 mA h g−1 over 75 cycles, which is much higher than those for neat Ni3Ge2O5(OH)4 nanosheets or the hybrid without the interfacial bonding. This study provides a novel perspective for designing high-performance Ge-based anode materials for advanced lithium ion batteries.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Bio Materials
·
2018
·
IF 0
Botao Song,Gaoli Hu
Nowadays, interest is growing toward drug-loaded inorganic particles with high drug encapsulation capacity to treat bone disease. However, the conventional adsorption method and in situ coprecipitation method always encountered the problem of low drug encapsulation efficiency. The phenomenon of water droplet standing in a near-spherical shape with very small contact area on the lotus leaf inspires us to demonstrate a simple and green strategy to handle this issue. Briefly, the slurry containing bone cement powders, drug, and water is first dripped onto the superhydrophobic surface to form a microreactor, and then the drug will be encapsulated in the confined microreactor due to the self-setting reaction of the bone cement powders with water. Calcium sulfate hemihydrate (CSH), a kind of biocompatible and historical bone cement, is employed to prepare calcium sulfate dihydrate (CSD) bone cement particles. Two kinds of drugs acetaminophen and ibuprofen with different water solubility are further individually embedded into the CSD matrix to investigate the drug encapsulation and release behaviors. The results indicate that the CSD particles with tunable diameters can be easily prepared by changing the volume of the dispensing droplets. Most importantly, the drug encapsulation efficiencies can reach up to 91% for both the hydrophilic and the hydrophobic drug, which are the highest as compared with the other reported methods. It is also indicated that the drug release profiles can be finely controlled by the size of the CSD particles and the drug loading amount. Our strategy provides a novel pathway in the rational design of drug-loaded particles with ultrahigh drug encapsulation efficiency, which shows great advantages in the bone repairing applications.
研究领域:
生物医学工程
·
材料科学
·
药学
✓ 已验证
产品关联
DOI
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Qingyang Li,Mengzhe Bao,Wenbin Li,Chong He
Massive production of SiO2 nanofibers with both high durability and exceptional performance remains a significant challenge. Herein, a novel approach was introduced to achieve the massive production of SiO2 nanofibers with lotus-leaf-inspired surfaces by combining solution blowing spinning (SBS) and the polymer-derived ceramics method. Based on the SBS technique, three types of precursor nanofiber products were fast spined with methyl silsesquioxane polymer and polymethyl hydrogen siloxane employed as Si sources. The flow rate of the SBS spined Si-based ceramic nanofibers was enhanced to 20 mL·h–1. Furthermore, through the integration of hydrophobic-oleophilic SiO2 nanoparticles into the precursor solution, SiO2 nanofibers with lotus-leaf nanoprotrusion surfaces were fabricated. Nanoparticle-decorated SiO2 fibers demonstrated excellent hydrophobicity (138.3°), compression resilience (∼60%), proficiency in organic pollutant adsorption, high-temperature resistance (∼1100 °C), and outstanding thermal insulation properties (thermal conductivity of 0.0165 W·(m·K)−1).
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）