ChemSusChem
·
2023
·Vol. 16
·期 11
·e202202184
·
IF 8.4
Shaoru Tang,Yanan Ma,Haimeng Wang,Yuxuan Liang,Xiaoyang Xu,Dingyu Zhang,Beiming Cao,Qian Wang,Wei Li
Graphical Reverse the microemulsion : Through adjusting the phase inversion in the reverse microemulsion system by using supercritical carbon dioxide, 2D/2D WO 3 /g-C 3 N 4 heterojunction photocatalyst is constructed via a one-pot method, which exhibits excellent photocatalytic activities towards the hydrogen evolution during water splitting. Construction of Z-scheme photocatalyst is an effective approach for using solar energy to produce hydrogen during water splitting. Herein, 2D/2D WO 3 /g-C 3 N 4 heterojunction photocatalyst was synthesized by a convenient and green method including exfoliation and heterojunction procedures, in the reverse microemulsion system via supercritical carbon dioxide (scCO 2 ). The resultant W/CN-10.3 composite exhibited enhanced photocatalytic activities towards the hydrogen evolution during water splitting with a hydrogen evolution rate of 688.51 μmol g −1 h −1 , which was more than 16 times higher than bulk g-C 3 N 4 with the same loading amount of Pt as cocatalyst. Due to its effective separation of photogenerated carriers and prolonged lifetime, more photoexcited electrons with high reduction ability could contribute to the production of H 2 . Possible formation mechanism of 2D-2D WO 3 /g-C 3 N 4 nanosheets via scCO 2 in the reverse microemulsion system by the one-pot method has been proposed. This work provides an efficient and green strategy to synthesize 2D-2D heterojunction for the utilization in solar-to-fuel conversion.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2023
·Vol. 25
·期 10
·3966-3973
·
IF 9.8
Huajian Feng,Qingyong Tian,Junhao Huang,Xinwei Cui,Jingyun Jiang,Yapeng Tian,Li Ye,Qun Xu
Two-dimensional (2D) transition metal carbides, nitrides, or carbonitrides, regarded as MXenes, hold great promise for an extensive range of applications such as efficient catalysis and energy conversion and storage materials. Up to now, various strategies for synthesizing MXenes have been explored, typically including an F-containing aqueous etching process, a molten salt etching method, etc. In this work, for the first time, we have designed a novel solid-phase etching approach to synthesize two-dimensional titanium carbide (MXenes) sheets with the assistance of supercritical CO2 (SC CO2), and the solid-phase etching mechanism behind the efficient fabrication process has also been revealed from a series of characterization methods. It is demonstrated that SC CO2-coated FeF3·3H2O can successfully help realize the delamination of multilayer MXenes into single-layer or few-layer MXenes, and at the same time, the as-prepared MXene sheets are demonstrated to have large surface area and size, high quality and rich fluorine termination groups, which make them efficient in the alkaline hydrogen evolution reaction (HER).
研究领域:
材料科学
·
催化
·
能量转换与存储
✓ 已验证
DOI
高影响因子
Journal of CO2 Utilization
·
2024
·
IF 7.2
Zhenrong Zheng,Junjie Dong,Jian Wang,Hongyang Wang
The majority of conventional flame retardants are made by chemical processes using petroleum resources, which cause serious pollution and waste of resources in the ecological environment. In this paper, flame retardants such as L-aspartic acid, DL-serine, L-tyrosine, L-lysine, L-phenylalanine, L-histidine, L-tryptophan, and glycine were employed to finish poly-(ethylene terephthalate) (PET) fabrics with supercritical CO 2 fluid. Scanning electron microscope (SEM) and Energy dispersive spectroscopy (EDS) were used to examine. the microstructure and chemical composition of flame-retardant PET fabrics. The limiting oxygen index (LOI) test and the vertical combustion test were used to assess the flame-retardant qualities of PET fabrics. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to test and assess the thermal properties of PET fabrics. The strength test was used to assess the mechanical properties of PET fabrics. The results showed that the amino acid flame retardants were successfully finished on the PET fabrics by supercritical CO 2 (SC-CO 2 ) technology and improved the thermal stability of the PET fabric. In comparison to untreated PET fabric, the elongation at break was 13–15 % greater, and the breaking strength was not reduced. Among them, the PET fabrics treated with L-aspartic acid and L-lysine had better flame-retardant performance, there were no droplets, the LOI values were greater than 30 %, and the char length was less than 10 cm. After 45 minutes of soaping and 3 times of washing, the LOI values were still above 28 %, and there were no droplets. Therefore, the PET fibers treated with amino acids using SC-CO 2 technology effectively improved the flame-retardant performance of PET fabrics.
研究领域:
材料科学
·
纺织工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
NANOTECHNOLOGY
·
2020
·Vol. 31
·期 37
·375603
·
IF 3.551
Guoyue Qiao,Qinqin Xu,Aiqin Wang,Dan Zhou,Jianzhong Yin
Herein, the desorption effect of supercritical CO2 (scCO2) was utilized to obtain sub-5 nm Ag nanoparticles (NPs) with a high Ag loading in SBA-15. The size of the Ag NPs decreased from 3.54 ± 0.79 nm (Ag loading of 25.3 wt.% wt.%) to 2.38 ± 0.68 (Ag loading of 10.5 wt%) nm by changing the depressurization curve from 0.1 MPa min−1 (20–14 MPa) to 3 MPa min−1 (20–12 MPa). Meanwhile, the intensity of the crystalline Ag characteristic peaks was obviously higher than the latter sample from the x-ray diffraction (XRD) patterns. However, compared with the adsorption kinetics of the two precursors of AgNO3 and Cu(NO3)2 on SBA-15, under the same deposition and depressurization conditions, when the two depositional systems used water as a co-solvent, the time taken to reach the adsorption equilibrium of Ag+ on the supports was longer than the time taken by Cu2+, which existed in the water as [Cu(H2O)4]2+. The surface of SBA-15 was hydrophilic, and then the interaction of Ag+ and the surface was weaker compared with Cu2+, making Ag+ highly dispersed on the surface under the scCO2 desorption effect. After calcination, the size of the Ag NPs decreased, but the morphology of CuO was mainly characterized by nanorods (NRs). Moreover, by comparing the experiments of wetness impregnation, the dispersion ability of the bulk scCO2 of the reactor was inefficient for Ag+ adsorbed on the channels in the depressurization process.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
Nano Research
·
2020
·Vol. 13
·期 4
·983-988
·
IF 8.183
Liu Lifei,Zhang Jianling,Tan Xiuniang,Zhang Bingxing,Shi Jinbiao,Cheng Xiuyan,Tan Dongxing,Han Buxing,Zheng Lirong,Zhang Fanyu
To construct the heterojunctions of TiO 2 with other compounds is of great importance for overcoming its inherent shortages and improving the visible-light photocatalytic performance. Here we propose the construction of TiO 2 /covalent organic framework (COF) heterojunction with tight connection by a supercritical CO 2 (SC CO 2 ) method, which helps bridging the transformation paths for photo-induced charge between TiO 2 and COF. The produced TiO 2 /COF heterojunction performs a H 2 evolution of 3,962 µmol·g −1 ·h −1 under visible-light irradiation, which is ∼ 25 times higher than that of pure TiO 2 and 4.5 folds higher than that of TiO 2 /COF synthesized by the conventional solvothermal method. This study opens up new possibilities for constructing heterojunctions for solar energy utilization.
研究领域:
材料科学
·
光催化
·
能源转换
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Zhuo Chen,Huadi Miao,Jiaye Wu,Yushu Tang,Wang Yang,Liqiang Hou,Fan Yang,Xiaojuan Tian,Liqiang Zhang,Yongfeng Li
The scalable production of large quantities of defect-free graphene nanosheets (GNs) with low cost and excellent properties is essential for practical applications. Despite the highly intense research of this area, the mass production of graphene nanosheets with high solubility remains a key challenge. In the present work, we propose a scalable exfoliation process for hydrophilic GNs by ball-milling-assisted supercritical CO2 exfoliation in the presence of poly(vinylpyrrolidone) via the synergetic effect of chemical peeling and mechanical shear forces. The exfoliation difficulty has been reduced due to the intercalation effects of supercritical CO2 molecules. With the ball-milling assistance, the modifier has been introduced onto the edge or/and surface of the GNs. The process results in hydrophilic GNs with little damage to the in-plane structure. The GNs can be dispersed in various solvents with a concentration of up to 0.854 mg/mL (water) and remain stable for several months.
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
Polymers
·
2018
·Vol. 10
·期 11
·1198
·
IF 2.935
Jingfu Jia,Kerong Zhang,Xue Zhou,Dan Zhou,Fahuan Ge
It is still controversial whether poor aqueous solubility is the most primary reason for the low oral bioavailability of insoluble drugs. Therefore, in this study, berberine-loaded solid polymeric particles (BPs) of varied dissolution profiles with β-cyclodextrin (β-CD) as carrier were fabricated using solution-enhanced dispersion by supercritical fluids (SEDS), and the relationship between dissolution and berberine (BBR) bioavailability was evaluated. Dissolution property was controlled via particle morphology manipulation, which was achieved by adjusting several key operating parameters during the SEDS process. Characterization on BP using infrared spectroscopy, differential scanning calorimetry, and X-ray diffraction indicated that BBR was dispersed in amorphous form, while nuclear magnetic resonance spectroscopy showed that methoxy groups of BBR were included into the cavities of β-CD. In vivo pharmacokinetic studies showed that oral bioavailability increased by about 54% and 86% when the dissolution rate of BBR was increased by 51% and 83%, respectively. The entry speed of BBR into the bloodstream was also advanced with the degree of dissolution enhancement. It seemed that dissolution enhancement gave positive effect to the oral bioavailability of berberine, but this might not be the crucial point. Meanwhile, supercritical CO2technology is a promising method for pharmaceutical research due to its advantages in regulating drug-dosage properties.Keywords:berberine;polymeric particle;supercritical CO2;dissolution;bioavailability
研究领域:
药学
·
药物递送系统
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2022
·Vol. 12
·期 33
·21041-21049
·
IF 4.036
Chun-gong Li,Qi Dang,Qinqin Yang,Dong Chen,Hongliang Zhu,Jiachen Chen,Runjin Liu,Xiang Wang
In order to investigate the pore properties and effect of storage time on the microstructure of CO2-dried aerogels, chitosan aerogel beads were obtained from chitosan hydrogels with an initial concentration in the range of 1.5–3.0 wt% through SCCO2 drying and freeze-drying (as a comparison). The SCCO2-dried chitosan aerogels showed a three-dimensional network structure, and had higher BET surface area (200 m2 g−1) and higher crystallinity (0.62/XRD, 0.80/ATR-FTIR) than the freeze-dried aerogels. The stability of the microstructure of the SCCO2-dried chitosan aerogel beads during 10 months was studied. The BET surface area of the aerogel beads at each concentration declined by 30.5% at 2 months, 56.7% at 6 months and 67.2% at 10 months. Accelerated aging tests of the chitosan aerogel beads were carried out to study the effect of humidity on the chitosan aerogel beads. The average diameter of the chitosan aerogel decreased from 2.3 mm to 0.9 mm when stored at 65 °C with 90% relative humidity (RH). In contrast, there was no obvious change during storage at 65 °C with 20% RH. The amount of adsorbed water increased from 4% to 12% at 65 °C with 90% RH for 96 h, and the bound water content of the aerogel beads gradually increased. This study demonstrates that SCCO2-dried chitosan aerogel beads could be better at maintaining their mesoporous structure, and the adsorption of water from the surrounding air had a significant effect on the microstructure and shrinkage of the chitosan aerogel beads.
研究领域:
材料科学
·
生物材料
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Jiawen Chen,Shuning Chen,Wei Cheng,Jinhuo Lin,Shisheng Hou,Haiqing Liu,Qinhui Chen
Effective control of bleeding is critical to saving lives whether on the battle field or in civilian life. Microporous starch (MS) is a promising hemostat for its extensive sources, huge surface area and good biocompatibility. However, the hemostatic performance of MS is limited because of its complex preparation process and lack of effective component to activate coagulation factors . Herein, porous starch microspheres modified by calcium (Ca-PSM) with dense shell and honeycomb micro-porous core were prepared by electrostatic spray and supercritical CO 2 for the first time. The topological morphology of Ca-PSM changed with the increase of Tween-80 content within 0.5%. Ca-PSM possessed excellent water absorbability due to high specific surface area, and what's more, it showed good hemostatic performance because of the synergistic effects of physical adsorption and chemical activation mechanisms. The results of thrombelastograph (TEG) showed that the initial clotting time (R) and coagulation time (R + K) of Ca-PSM-1 were shortened by 47.1%, 53.3% than that of control group. The maximum blood clot strength (MA) of Ca-PSM-1 was also significantly raised. Furthermore, it was noteworthy that Ca-PSM could activate clotting cascade and induce erythrocyte adsorption. In summary, Ca-PSM as a hemostat will be a promising and alternative candidate for clinical application.
研究领域:
生物材料学
·
医学工程
·
药剂学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Hanyang Gao,Haijun Liu,Chengzhi Song,Guoxin Hu
In recent years, graphene has become the most popular conductive filler in conductive polymers which can be used in many practical applications. A proper selection of the mixing method is the decisive factor to maximize the excellent conductivity of graphene in a polymer matrix. In this work, ultrasound-assisted supercritical CO 2 (scCO 2 ) method was used for the first time to prepare graphene infiltrated conductive natural rubber (NR). Many interesting phenomena were discovered. First, it was found that NR was fully swollen after an ultrasound-assisted scCO 2 penetration and a following rapid decompression process. The degree of expansion of NR in scCO 2 was even larger than in toluene. Secondly, ultrasound-assisted scCO 2 method coupled with a rapid decompression process successfully inserted graphene particles in the swollen NR to prepare conductive NR/graphene materials. The impacts of the decompression method, vulcanization degree, and ultrasonication duration on graphene infusion were studied and analyzed. Under an optimal condition, the surface conductivity of as-prepared unvulcanized graphene/NR film or vulcanized film with a low graphene loading fraction (0.34 vol%) could reach to 0.2 S/m or 0.02 S/m, respectively, taking a leading position in the reported graphene/NR composites. Our conductive NR was shown to be satisfactory as a strain sensor for the measurement of fine movements of human body such as heartbeat, finger bending, and vocalization. Since only scCO 2 , one of the most environmentally benign solvents, was used in the whole process, this routine is not only efficient but also environmentally friendly. We believe this method is versatile and can be applied to many other polymers that can be swollen in scCO 2 .
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DRUG DELIVERY SCIENCE AND TECHNOLOGY
·
2019
·
IF 2.606
Jingfu Jia,Kerong Zhang,Xue Zhou,Jinfang Ma,Xiaojing Liu,Anya Xiang,Fahuan Ge
In present study, berberine proliposomes (ber-PL) of powder state that can form liposomal structure via self-assemble in water was prepared using solution enhanced dispersion by supercritical CO 2 (SEDS) to improve the oral bioavailability of berberine. Several important parameters were optimized using Box-Behnken design to get ber-PL with high entrapment efficacy ( EE ) of 90.3% ± 4.9%. Physicochemical characterization showed the optimum ber-PL was amorphous spherical nanoparticles and could form uniform liposomes around 80 nm easily via hydration. EE was closely related to the particle morphology of ber-PL. In vitro drug release study displayed a sustained release profile, and the drug released faster in neutral condition than acid medium. The oral bioavailability for ber-PL was 22.47 times greater than raw berberine, and the mean residence time of berberine in plasma was extended from 6.82 ± 2.99 to 10.83 ± 2.01 h as well. The proliposome formulated using SEDS is a favorable strategy to improve the bioavailability of berberine.
研究领域:
药剂学
·
药物递送系统
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2021
·Vol. 26
·期 16
·5005
·
IF 4.412
Jingfu Jia,Shulei Duan,Xue Zhou,Lifang Sun,Chengyuan Qin,Ming Li,Fahuan Ge
Biocompatible skin wound dressing materials with long-term therapeutic windows and anti-infection properties have attracted great attention all over the world. The cooperation between essential oil and non-toxic or bio-based polymers was a promising strategy. However, the inherent volatility and chemical instability of most ingredients in essential oils make the sustained pharmacological activity of essential oil-based biomaterials a challenge. In this study, a kind of film nanocomposite loaded with patchouli essential oil (PEO-FNC) was fabricated. PEO-loaded mesoporous silica nanoparticles (PEO-MSNs) with drug load higher than 40 wt% were firstly prepared using supercritical CO2cyclic impregnation (SCCI), and then combined with the film matrix consisting of polyvinyl alcohol and chitosan. The morphology of PEO-MSNs and PEO-FNC was observed by transmission and scanning electron microscope. The mechanical properties, including hygroscopicity, tensile strength and elongation at break (%), were tested. The release behavior of PEO from the film nanocomposite showed that PEO could keep releasing for more than five days. PEO-FNC exhibited good long-term (>48 h) antibacterial effect onStaphylococcus aureusand non-toxicity on mouse fibroblast (L929 cells), making it a promising wound dressing material.Keywords:wound dressing;supercritical CO2;patchouli essential oil;antibacterial;long-term;porous;film
研究领域:
材料科学
·
纳米技术
·
药学
·
生物材料
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）