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
·
高分子化学
·
电化学
✓ 已验证
DOI
JOURNAL OF FOOD PROCESSING AND PRESERVATION
·
2018
·Vol. 42
·期 8
·e13696
·
IF 1.51
Xingzhong Zhang,Xia Wu,Wei Li,Xiaogang Luo,Yan Li,Bin Li,Shilin Liu
In order to increase the solubility, stability, and availability of cinnamaldehyde which was widely used in food industry, ethyl cellulose aqueous dispersions encapsulated cinnamaldehyde had been prepared by using an anti-solvent induced method. The particles size of the obtained aqueous dispersions was in the range of 150–200 nm, and it increased slightly with the increasing concentrations of the precursor solution. The prepared dispersions after being dried at ambient conditions had the ability to form a free-standing film, and the film had denser structure and smooth surface. Moreover, the ethyl cellulose dispersions had powerful encapsulation ability to cinnamaldehyde, and the encapsulated cinnamaldehyde could be sustained released, it could prolong the storage time of fresh pork samples for more than 6 days, and an excellent antimicrobial property for food spoilage was observed. It indicated that the prepared dispersions could be a fascinating supporter for increasing the stability and sustained-release of cinnamaldehyde. Practical applications In this work, the ethyl cellulose aqueous dispersions encapsulating with cinnamaldehyde had good stability, and the sustained released of cinnamaldehyde could effectively inhibit the growth of spoilage organism for a long time, which indicated that aqueous dispersions system had potential applications for food preservation.
研究领域:
食品科学
·
材料科学
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CLAY SCIENCE
·
2019
·
IF 3.89
Hui-Ran Jin,Xin-Yu Zhou,Yong Zhu,Guo-Fan Sun,Shi-Jie Ding,Jing Chen
In this paper, non-aqueous Fe(OH) 3 /palygorskite dispersion was prepared and its liquid crystal phase behavior was investigated. Positively charged Fe(OH) 3 colloidal particles were put in to non-aqueous and organically modified palygorskite dispersion. The effects of organically treated palygorskite and Fe(OH) 3 on the preparation of stable palygorskite dispersion were characterized with FT-IR, XRD , Contact Angle measurement , Zeta potential detection, Settlement measurement and SEM , respectively. The addition of Fe(OH) 3 particles shifted the concentrations of the coexisting isotropic and nematic phases to higher values while at the same time markedly accelerated the phase separation. The influence of Fe(OH) 3 particles on the dispersion in magnetic field was also discussed.
研究领域:
材料科学
·
胶体化学
✓ 已验证
DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2014
·
IF 8.535
Peng He,Jing Sun,Suyun Tian,Siwei Yang,Shengju Ding,Guqiao Ding,Xiaoming Xie,Mianheng Jiang
Dispersing graphene in various solvents is one of the key technologies toward the practical applications of graphene. Herein, using graphene quantum dots (GQDs) as stabilizer, aqueous dispersions of graphene with good stability were demonstrated by directly dispersing commercialized graphene powder into water. Amazingly, 100 mg of graphene powder could be stabilized by an average of merely 7.8 mg GQDs to form aqueous dispersions with a maximum concentration of up to 0.4 mg/mL and stability at least 3 months. The introduction of a small amount of GQDs also allowed for the fabrication of water-redispersible graphene slurry and powder, which would largely facilitate the transportation and applications of graphene. The mechanism of the GQDs stabilized graphene in water was proposed and experimentally verified through UV–visible spectroscopy and zeta potential measurements. Moreover, flexible graphene papers directly assembled from the water-dispersible graphene exhibited controllable thickness, good conductivity, and acceptable strength. With properties not compromised by GQDs, water-dispersible graphene is expected to be widely applicable in electrical and electrochemical device fields.
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
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
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 18
·9649-9657
·
IF 3.269
Linjian Li,Kun Zhang,Li Chen,Zhong Huang,Guangbin Liu,Mingfang Li,Yangping Wen
Agroforestry waste being used as biochar, for agricultural, environmental and climatic applications, has attracted considerable attention, but there are few reports on biochar as electrode modified materials and solid fuel briquettes. In this paper, we demonstrated a new strategy for the mass preparation of micro/nano-powders of biochar with water-dispersibility and their potential applications in different fields. Ultra-fine powders of biochar were easily obtained through pyrolyzing fine powders of smashed biomass waste based on pitch pine at high temperature under oxygen-limited conditions. Micro/nano-powders of biochar were facilely prepared through milling and sieving ultra-fine powders of biochar. Water-dispersible biochars were easily developed through sonicating and centrifugally separating micro/nano-powders of biochar. The structures and properties of two biochar types were characterized, and upper-layer biochar was more steadily dispersed in water and of a smaller size than lower-layer biochar, which was mainly employed as an electrode material in a Pb2+ voltammetric sensor and as solid fuel briquettes for pellet biofuels, and other preliminary applications like use as rice bio-fertilizers and Pb2+ bio-adsorbents also were given. The satisfactory results indicated that micro/nano-structured and/or water-dispersible biochar will provide promising platforms for electrochemical applications as electrode materials, as a cleaner and renewable alternative to coal fuel, and for other uses, like as bio-fertilizers for crop seedling and growth, and as bio-adsorbents for the removal of hazardous substances.
研究领域:
农业科学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
·
2022
·Vol. 48
·期 7
·8387-8399
·
IF 2.807
Jiang Xiaodong,Wang Jiankun,Guo Jing,Liu Meiling,Fang Ying
In this study, reduced graphene oxide (RGO) with good water dispersibility and excellent adsorption performance was successfully prepared using sodium borohydride (NaBH 4 ) as reductant, and their characterization and adsorption performance for Basic Red13 (BR13) and Cu 2+ were analyzed. The results showed that RGO had an obvious graphene-like structure with the C/O ratio of 3.19, while the C/O ratio of graphene oxide (GO) was only 1.81. The reason for the good water dispersibility of RGO was the retention of partial oxygen-containing groups, especially carboxyl groups. The adsorption of RGO for BR13 and Cu 2+ was typical monolayer physisorption, which could be well-described by pseudo-first-order and Langmuir isotherm models. The maximum adsorption capacities of RGO were 1674.01 mg/g for BR13 at pH = 13 and 164.72 mg/g for Cu 2+ at pH = 6, which much higher than the corresponding values of 1258.65 mg/g and 123.14 mg/g for GO. In particular, the adsorption capacity of RGO for BR13 was the highest value reported so far. Moreover, no significant loss of adsorption performance was observed even after five cycles. This work suggested that reduced graphene oxide was an efficient adsorbent for the removal of organic dyes and heavy metal ions from water, which had great potential in pollution control applications.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 9
·805
·
IF 4.4
Deyue Xiao,Peng He,Haolong Zheng,Shujing Yang,Siwei Yang,Guqiao Ding
Graphene has achieved mass production via various preparative routes and demonstrated its uniqueness in many application fields for its intrinsically high electron mobility and thermal conductivity. However, graphene faces limitations in assembling macroscopic structures because of its hydrophobic property. Therefore, balancing high crystal quality and good aqueous dispersibility is of great importance in practical applications. Herein, we propose a tape-wrapping strategy to electrochemically fabricate water-dispersible graphene (w-Gr) with both excellent dispersibility (~4.5 mg/mL, stable over 2 months), and well-preserved crystalline structure. A large production rate (4.5 mg/min, six times faster than previous electrochemical methods), high yield (65.4% ≤5 atomic layers) and good processability are demonstrated. A mechanism investigation indicates that the rational design of anode configuration to ensure proper oxidation, deep exfoliation and unobstructed mass transfer is responsible for the high efficiency of this strategy. This simple yet efficient electrochemical method is expected to promote the scalable preparation and applications of graphene.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Jiejun Ren,Longyun Liu,Fan Liu,Huiping Liu,Xiaopeng Zhou,Gen Li,Liangjun Chen,Guoping Yan,Yuhua Wang
Lead halide perovskite (LHP) nanocrystals (NCs) suffer from poor stability against environmental factors (heat, moisture, oxygen, etc.), which seriously hinders their practical application. Constructing a core-shell structure could be an effective approach to improve the stability and optical properties of the LHP NCs. Herein, a novel strategy of water-triggered phase transformation and phospholipid (DSPE) micelle encapsulation is proposed, generating highly luminescent water-dispersed CsPbBr 3 @CsPb 2 Br 5 @DSPE core-shell-shell nanocrystals. The epitaxial growth of the CsPb 2 Br 5 shell is induced by the in-situ reconstruction of the CsPbBr 3 surface by water erosion, and the lattice mismatch with the CsPbBr 3 core is small (3.8%). The further amphipathic phospholipid encapsulation guarantees their excellent water dispersity and stability. Revealed by the femtosecond transient absorption spectroscopy, the dense CsPb 2 Br 5 @DSPE shell effectively passivates the surface of the CsPbBr 3 core, thus improving its stability and luminescence performance. The resulting CsPbBr 3 @CsPb 2 Br 5 @DSPE nanoparticles exhibit excellent performance as fluorescent probes for bioimaging, aqueous inks for high-resolution pattering, and light conversion layers for LEDs, demonstrating their promising potential in multiple applications.
研究领域:
材料科学
·
生物医学工程
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL RESEARCH
·
2024
·
IF 1
Liyuan Zhang,Xuewen Bai,Kai Zou,Linlin Zhu
Magnetic polymer microspheres have attracted a great deal of attention due to their magnetic properties and good biocompatibility. In this study, novel magnetic cross-linked poly(divinylbenzene-co-acrylic acid) microspheres were successfully prepared via improved emulsion polymerization. The microstructures of nanocomposites were characterized using scanning electron microscopy, transmission electron microscope, energy-dispersive X-ray spectrometry, X-ray diffraction, and saturation magnetization measurements. It was noteworthy that the nanocomposites displayed good water dispersibility, a rapid absorption rate, a high absorption capacity, and high magnetic separability, results that are promising in terms of these nanocomposites’ future application in biomedical fields.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Junyu Chen,Meiying Liu,Qiang Huang,Long Huang,Hongye Huang,Fengjie Deng,Yuanqing Wen,Jianwen Tian,Xiaoyong Zhang,Yen Wei
Nanodiamond (ND)-based fluorescent probes have been extensively researched in cell imaging applications. Several outstanding properties of fluorescent NDs (FNDs), such as their excellent biocompatibility, intensive fluorescence and chemical stability in organisms, have made them the most promising carbon materials in biomedicine. However, the production of FNDs with nitrogen-vacancy defect centers was rather complicated and costly, which limited their wide application in the biomedical field. Moreover, the particle size of these types of FNDs was much larger than that of NDs produced by the detonation method; thus, it is difficult for them to penetrate the cell membrane. In this present work, a facile and ultrafast photo-initiated reversible addition-fragmentation chain transfer (RAFT) polymerization was introduced for the fabrication of FND-based polymer composites. The photo-initiated RAFT polymerization is time saving, environmentally friendly and highly efficient. To prepare these FNDs, fluorescein was converted into diacryloyl fluorescein (AcFl), which was used not only as the photocatalyst but also a fluorescent comonomer. The functional monomer 2-methacryloyloxyethyl phosphorylcholine (MPC) was introduced to improve the water dispersibility of the FNDs. The successful fabrication of FNDs-polyMPC composites was proven by a series of characterization methods. These FNDs-polyMPC composites show high water dispersibility, strong fluorescence and low toxicity. The cell uptake behavior suggested that FNDs-polyMPC composites can be facilely internalized by cells. Taken together, FNDs-polyMPC composites can be fabricated by a photo-initiated RAFT polymerization. These FNDs-polyMPC composites possess excellent physicochemical and biological properties and are promising candidates for cell imaging applications.
研究领域:
材料科学
·
生物医学工程
·
细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
·
2021
·
IF 4.291
Shenghong Yang,Xin Wang,Enshou Li,Xiaoyang Liu,Jinshuang Hu,Jian Liu
The environmental risk of artificial synthetic dyes sparked interest in exploring high-security fluorescent materials for suitable analysis applications. Chlorophyll-based fluorescent material is a good candidate but subjects to inferior dispersibility and low fluorescence efficiency in water. In this work, we successfully prepared a water-dispersible chlorophyll-based fluorescent material through simple solvent extraction of willow seeds. Compared to other conventional sources of chlorophyll, such as willow leaves, metasequoia, and green algae, only the chlorophyll-based material from willow seeds (C-WS) can retain good near-infrared fluorescence performance with an emission wavelength of 677 nm in the water phase, which can promote the practical application of chlorophyll-based fluorescent materials. An “on-off-on” sensing system was constructed based on C-WS for the highly sensitive and selective detection of Cu 2+ and biothiols in aqueous solution. The limit of detection for Cu 2+ and GSH can reach 1.2 nM and 92 nM, respectively. Furthermore, the proposed system was successfully used in the detection of Cu 2+ in real water samples and biothiols in food samples, and successfully applied for the visualization of intracellular Cu 2+ and biothiols in Hela cells.
研究领域:
分析化学
·
环境科学
·
生物医学
✓ 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）