JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 1
·1-11
·
IF 2.009
You Xiao,Feng Qian,Yang Jinshan,Huang Kai,Hu Jianbao,Dong Shaoming
Exploring the graphene material is premised on the graphene sheets being single-layer graphene (SG) or bi-layer graphene (BG) state, and graphene suspension keeps stably disperse are critical. Since graphene has a highly conjugated system, it is easy to conduct strong π-π interaction with conjugated structure. In this paper, by dispersing graphene powder at low boiling point solvent water or ethanol, ensuring the excellent properties of graphene are not affected by the solvent, which simultaneously solves the difficulty of removing organic solvents. On the basis the concentration of graphene suspension can be greatly improved and no damage to the graphene sheets in the presence of dispersant. This method allows us to prepare a large amount of excellent graphene dispersion, making it possible to obtain graphene-based materials through the low-cost technology, as well as opening up the opportunity for exploiting the application of this nanocarbon material with unique structure.
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研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2021
·Vol. 23
·期 8
·1-20
·
IF 2.253
Khanam Zeba,Liu Jianghe,Song Shenhua
Herein, an efficient, facile, scalable production of graphene dispersions via exfoliation of graphite in an environment-friendly PVA/H 2 O solvent system is reported. To warrant the impact of processing parameters on exfoliation efficiency, a systematic investigation is carried out using UV–visible spectroscopy. Under the optimal shearing parameters (1 h, 10 k rpm) with the PVA-to-fed graphite mass ratio of 10, a high concentration graphene dispersion (3.36 mg mL −1 ) is achieved. The estimated graphene yield is found to be 33% that further increases to 90% after sediment recycling. With the aim of detailed quality analysis, centrifugal cascading is adopted to predominately sort the graphene flakes from the upper end of the distribution. Through various characterization techniques, it is confirmed that the resulting dispersion comprises high-quality graphene flakes (1–5 layers) having thickness up to 1.48 nm, lateral dimension ranging from 0.3 to 4 µm, and quite a low level of defects ( I D / I G = 0.1). The statistical distribution histogram reveals that most flakes are single-layer (41%), including some bi-layer (21%) and tri-layer (28%), while the remaining can be said five or multi-layer graphene. Meanwhile, the efficacy of the PVA/H 2 O solvent system is also demonstrated using ultrasonic exfoliation, providing a high concentration of graphene (1.1 mg mL −1 ) in a relatively short time (8 h). Furthermore, the applicability of the PVA-stabilized graphene dispersion is addressed by fabricating various graphene products such as graphene paper electrodes, graphene composites, and graphene thin films. Impressively, the graphene paper electrode imparts an exceptionally high specific capacitance of 199.63 F g −1 in a potential window range of 0 to 2 V, and hence could be a promising alternative to traditional electrodes in supercapacitors. Conclusively, the exfoliation of graphite in a green polymer–solvent system offers to produce highly concentrated graphene dispersions at a minimal cost that could be widely applicable in different research areas, thus holding the potential for commercial viability.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
ACS Applied Engineering Materials
·
2024
·
IF 0
Yan Liao,Jian Li,Chenyi Wang,Qiang Ren
Poly(3,4-ethylenedioxythiophene):poly(sodium styrenesulfonate) (PEDOT:PSS) is widely used in many aspects due to its good electrical conductivity. However, the low solid content of the PEDOT:PSS aqueous dispersion hinders its further application. Aiming to address this problem, a kind of novel “long-armed” crosslinked microspheres (cPBA@PSS), with crosslinked poly(butyl acrylate) as the core and poly(sodium styrenesulfonate) as the “long arm”, is synthesized via reversible addition–fragmentation chain transfer (RAFT) soap-free emulsion polymerization. With the “long-armed” crosslinked microspheres as the template, poly(3,4-ethylenedioxythiophene):poly(butyl acrylate-co-sodium styrenesulfonate) (PEDOT:cPBA@PSS) with a high solid content and low viscosity is successfully fabricated. The structures of cPBA@PSS are confirmed by infrared spectroscopy and hydrogen nuclear magnetic resonance spectroscopy. A PEDOT:cPBA@PSS aqueous dispersion with a solid content as high as 25 wt % is obtained by using long-armed crosslinked microspheres as the template due to the reduction of the entanglement between macromolecules. The kinetic study shows that the solid content of the dispersion has little effect on the polymerization rate of 3,4-ethylenedioxythiophene (EDOT). However, the viscosity of PEDOT:cPBA@PSS aqueous dispersions increases with an increase in the solid content. A PEDOT:cPBA@PSS aqueous dispersion with a solid content of up to 25 wt % shows a viscosity of about 37 mPa·s. The effect of the solid content on the transparency of PEDOT:cPBA@PSS films is studied, and no significant impact on film transparency is observed. The transmittance of the films at 550 nm is over 80%. The conductivity of the PEDOT:cPBA@PSS film increases with an increase in the solid content of the dispersion. The PEDOT:cPBA@PSS aqueous dispersion with a solid content of 25 wt % shows a conductivity of 0.68 S/cm when the ratio of PEDOT to cPBA@PSS is 1:1. The conductivity of the PEDOT:cPBA@PSS film can also be enhanced by secondary doping of dimethyl sulfoxide (DMSO), and the conductivity of the PEDOT:cPBA@PSS film can be increased to about 3.82 S/cm. This study shows that the use of the long-armed crosslinked microsphere cPBA@PSS as a template is an effective method to fabricate PEDOT aqueous dispersions with a high solid content and low viscosity.
研究领域:
材料科学
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高分子化学
·
电化学
✓ 已验证
DOI
ANALYTICAL LETTERS
·
2015
·
IF 1.03
Xiaojun Wang,Jingjing Chen,Ying Zhou,Xiaoyi Liu,Hongzhou Yao,Farooq Ahmad
A rapid and novel two-step dispersive liquid–liquid microextraction and dispersive micro-solid phase extraction method was established for the separation and enrichment of trace cadmium, nickel, and copper in food and environmental water prior to determination by inductively coupled plasma-mass spectrometry (ICP-MS). In the first microextraction step, carbon tetrachloride was employed to extract metal-diethyldithiocarbamate chelates from aqueous solution with ultrasound. In the following step, Fe3O4 magnetic nanoparticles were added and used to collect the analytes in the organic solvent. The sample pH, type and volume of extraction solvent, mass of magnetic nanoparticles, concentration of the chelating agent, concentration of sodium chloride, and sonication time were optimized. The linear dynamic range was from 0.01 to 20 micrograms per liter with correlation coefficients between 0.9990 and 0.9992. Enrichment factors were 78, 79, and 81 for cadmium, nickel, and copper, respectively. The limits of detection for cadmium, nickel, and copper were 0.007, 0.009, and 0.017 micrograms per liter, with relative standard deviations from 1.1 to 2.6 percent. The developed method was validated by the determination of cadmium, nickel, and copper in rice and mussel certified reference materials, food, and environmental water with satisfactory results.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 18
·3763
·
IF 4.967
Yalin Li,Jieling Luo,Baoquan Huang,Hongjun Jin,Xiaoli Sun,Changlin Cao,Qinghua Chen,Qingrong Qian
With the aim of developing green coatings, styrene–acrylic emulsion has been widely used in architectural coatings due to its excellent environmental protection and energy conservation. Nevertheless, the lack of water and oxygen resistance of water-based styrofoam coatings has promoted various nanomaterials being studied for modification. To improve the performance of waterborne styrofoam coating, we introduced the graphene nanopowder and expected to enable it with the function of electromagnetic interference (EMI) shielding to reduce the damage of electromagnetic radiation. In this paper, the problem of poor interface compatibility between graphene and polymer resin was successfully addressed by in situ polymerization. In the process of pre-polymerization of styrene–acrylic emulsion monomer, graphene-modified styrene–acrylic emulsion was obtained by introducing graphene aqueous dispersion. The results showed that the styrene–acrylic emulsion with 4 wt% aqueous graphene dispersions exhibited the best dispersion stability, improved water and oxygen resistance, and the conductivity reached 1.89 × 10−2S/cm. Then, the graphene-modified coating for building was prepared by using graphene-modified styrofoam emulsion. All the performance indexes of the coating are in line with the industry standards, and it still showed benign EMI shielding effect even when the graphene content was low. It is demonstrated that in situ polymerization technology and the application of graphene in resin coatings modification will promote the development of green coatings.Keywords:graphene;aqueous dispersions;in situ polymerization;modified styrene–acrylic emulsion
研究领域:
材料科学
·
绿色化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Dongxia Zhang,Juntao Zeng,Shengtao Zhu,Hao Ma,Xiaoxi Kang,Li Lou,Zemin He
In this work, two silicon nanomaterials are doped into polymer/liquid crystal composites by a facile method. SEM and FT-IR characterizations indicate that SiO 2 -SH and synthesized thiol polyhedral oligomeric silsesquioxane (POSS-SH) have been successfully implanted into PDLCs successfully. The electro-optical tests imply that the electro-optical performance of PDLC films can be greatly enhanced by doping proper amounts of SiO 2 -SH nanoparticles and nanostructured POSS-SH into the polymer matrix . The driving voltage can be reduced by nearly 78.2% if the concentration of SiO 2 -SH is 4 wt%; whereas only nearly 60% driving voltage is reduced when 4 wt% POSS-SH is doped into system, indicating better electric-optical performance regulation effect of SiO 2 . The lower driving voltage of SiO 2 -SH doped PDLC samples may be due to the existence of high content –SH on the surface of nanoparticles, which can conduct click reactions with acrylate bond under the effect of initiator.
研究领域:
材料科学
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光学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2025
·Vol. 15
·期 21
·16734-16741
·
IF 4.6
Xiaofang Sun,Chuanbin Zhang,Youwen Pan,Haiyang Mei,Jiawen Song,Mengfei Zhou
The traditional standard method for the determination of the heavy metal pollutant antimony (Sb) in water, 5-Br-PADAP spectrophotometry, involves the consumption of many kinds of chemical reagents and has low sensitivity. For highly toxic liquid and gas containing Sb(III), this paper presents a green determination method based on UV/O3 synergistic oxidation-malachite green-dispersive liquid–liquid microextraction (DLLME)-spectrophotometry, which can achieve the enrichment of a trace amount of antimony in water and high-precision detection. Using the selective complexation and color development of protonated alkaline dye and the solubility difference of the complexes involved, an enrichment and determination method for trace Sb(V) in surface water was established for the first time. Based on the feature of the UV/O3 system of rapid and complete oxidation of Sb(III), and the easy elimination of the disturbance of residual oxidant, the green determination method for trace total antimony (TSb) was constructed based on advanced oxidation processes (AOPs). To verify the validity of the proposed method, all the process parameters and environmental factors affecting the oxidation efficiency of Sb(III) and the enrichment performance of DLLME were investigated and optimized. The results showed that the proposed method exhibited good linearity (R2 = 0.9943), a low method detection limit (MDL = 0.3208 μg L−1), and high precision (1.63%) and accuracy (0.64%) in the range of 1–30 μg L−1, under the optimized process conditions. By the difference method, the trace free antimony (Sb(III), Sb(V)) and total antimony (TSb) can be determined simultaneously.
研究领域:
环境科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Coatings Technology and Research
·
2025
·
IF 2.8
Tang Baoling,He Ziyu
The commonly used dispersants for graphene dispersions reduce the conductivity of the composite. In this work, a dispersant with an amphiphilic structure, CA-g-PANI, has been designed and synthesized. The dispersant grafts citric acid (CA) onto polyaniline via an amide reaction, which gives CA-g-PANI the hydrophilic groups (carboxyl groups) and the benzene ring structures that can be π–π conjugated with graphene, and it can improve the dispersion properties of graphene; CA-g-PANI contains the polyaniline structure, which is electrically conductive and enhances the electrical conductivity of graphene dispersions. The molecular structure and properties of the dispersant were systematically characterized through FTIR spectra, UV absorption spectra, and other methods. The graphene-based composites were prepared by screen printing method, and the dispersibility and resistivity of CA-g-PANI were compared with gum arabic and alkali lignin (natural dispersants). Graphene concentration reached up to 30 mg/mL in the presence of CA-g-PANI at the weight ratio of 1:0.03 (CA-g-PANI: graphene). CA-g-PANI also exhibited good performance for stabilizing graphene (stable for 6 days), with an electrical conductivity of up to 917.43 S/m. In the study, it was shown that CA-g-PANI as a graphene dispersant improved the conductivity of graphene dispersions while enhancing the dispersing properties of graphene.
研究领域:
材料科学
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化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
ELECTROPHORESIS
·
2013
·Vol. 35
·期 4
·474-481
·
IF 3.261
Fangfang Yang,Jinhua Li,Wenhui Lu,Yingying Wen,Xiaoqiang Cai,Jinmao You,Jiping Ma,Yangjun Ding,Lingxin Chen
In this study, a method of pretreatment and speciation analysis of mercury by dispersive liquid–liquid microextraction along with CE was developed. The method was based on the fact that mercury species including methylmercury (MeHg), ethylmercury (EtHg), phenylmercury (PhHg), and Hg(II) were complexed with 1-(2-pyridylazo)-2-naphthol to form hydrophobic chelates and l -cysteine could displace 1-(2-pyridylazo)-2-naphthol to form hydrophilic chelates with the four mercury species. Factors affecting complex formation and extraction efficiency, such as pH value, type, and volume of extractive solvent and disperser solvent, concentration of the chelating agent, ultrasonic time, and buffer solution were investigated. Under the optimal conditions, the enrichment factors were 102, 118, 547, and 46, and the LODs were 1.79, 1.62, 0.23, and 1.50 μg/L for MeHg, EtHg, PhHg, and Hg(II), respectively. Method precisions (RSD, n = 5) were in the range of 0.29–0.54% for migration time, and 3.08–7.80% for peak area. Satisfactory recoveries ranging from 82.38 to 98.76% were obtained with seawater, lake, and tap water samples spiked at three concentration levels, respectively, with RSD ( n = 5) of 1.98–7.18%. This method was demonstrated to be simple, convenient, rapid, cost-effective, and environmentally benign, and could be used as an ideal alternative to existing methods for analyzing trace residues of mercury species in water samples.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Meng Lan,Xiaohua Jia,Rui Tian,Jin Yang,Dan Shao,Sizhe Wang,Yong Li,Lei Feng,Haojie Song
To maximize the performance of carbon nanotubes (CNTs) in photothermal conversion textiles, the green and efficient methods for the preparation of highly concentrated and stable aqueous dispersion of CNTs need to be urgently developed. Herein, the aqueous dispersion of CNTs with exceeding high concentration limits (over 100 mg/mL) is synthesized by an eco-friendly one-step hydrothermal method with the assistance of ionic liquid crystals (ILC). CNTs non-covalently wrapped by ILC can exist in various forms, such as well-dispersed dispersion, conductive slurry, thixotropic gel, and deformable dough. Particularly, the highly concentrated dispersion has excellent dispersion stability and remains stable even after 60 days of resting. Due to the cationic head group of ILC, the positively charged dispersion was electrostatically self-assembled to prepare photothermal textiles with excellent mechanical robustness and chemical stability, which can be applied to multiple harsh working conditions. This research shows an efficient and feasible method for the non-destructive dispersion of CNTs at high concentrations and also provides a reference for photothermal conversion applications of CNTs.
研究领域:
材料科学
·
绿色化学
·
纳米技术
✓ 已验证
DOI
高影响因子
MOLECULES
·
2023
·Vol. 28
·期 5
·2253
·
IF 4.6
Rui-Juan Xiong,Yun-Xiao Ren,Yong-Feng Cui,Shu-Feng Cai,Wan-Li He,Xiao-Tao Yuan
In this paper, based on high-throughput technology, polymer dispersed liquid crystals (PDLC) composed of pentaerythritol tetra (2-mercaptoacetic acid) (PETMP), trimethylolpropane triacrylate (TMPTA), and polyethylene glycol diacrylate (PEGD 600) were investigated in detail. A total of 125 PDLC samples with different ratios were quickly prepared using ink-jet printing. Based on the method of machine vision to identify the grayscale level of samples, as far as we know, it is the first time to realize high-throughput detection of the electro-optical performance of PDLC samples, which can quickly screen out the lowest saturation voltage of batch samples. Additionally, we compared the electro-optical test results of manual and high-throughput preparation PDLC samples and discovered that they had very similar electro-optical characteristics and morphologies. This demonstrated the viability of PDLC sample high-throughput preparation and detection, as well as promising application prospects, and significantly increased the efficiency of PDLC sample preparation and detection. The results of this study will contribute to the research and application of PDLC composites in the future.Keywords:high-throughput;polymer-dispersed liquid crystal;saturation voltage;grayscale value
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2022
·
IF 4.432
Hongbo Lu,Peng Huang,Tanyang Wu,Cuifen Chen,Jianzhou Shi,Miao Xu,Longzhen Qiu,Yunsheng Ding,Jun Zhu
A wavelength-selective, two-stage polymerization of acrylate-thiol for the formation of polymer dispersed liquid crystal (PDLC) films is developed. Via this method, the PDLC with microsphere polymer morphology was successfully prepared, which greatly improved the contrast ratio (CR) and adhesion without causing other performance degradation. The change of morphology from the porous to the microsphere structure could be controlled by adjusting the reaction time of the Michael addition reaction. Furthermore, the size and uniformity of the microsphere structure could be controlled by tuning the content of the free radical initiator. This work is expected to provide an effective method to control the microstructure of acrylate-thiol polymers in solution polymerization , and can possibly allow the fabrication of PDLCs with high CR and adhesion, which is of great significance in large, flexible displays, switchable windows, and light valves.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）