ADVANCED ENGINEERING MATERIALS
·
2025
·
IF 3.3
Wenxiang Wang,Hongxin Guo,Yutong Ding,Zhou Chen,Ling Yu,Songdi Wu,Tairong Kuang
Polymer foams, particularly those prepared using supercritical carbon dioxide (Sc-CO 2 ), are extensively utilized in diverse applications like thermal insulation and packaging due to their lightweight and efficient properties. However, the effectiveness of Sc-CO 2 foaming is often limited by low cell density and large cell size, mainly resulting from insufficient nucleation control and inadequate gas management. In this study, hollow metal-organic frameworks (MOFs) (HZIF-8) were introduced as effective nucleating agents in Sc-CO 2 -assisted polystyrene (PS) foaming. Owing to their unique hollow structure and high internal surface area, HZIF-8 significantly enhances gas adsorption and storage capacity, thereby improving nucleation efficiency during the foaming process. The results show that incorporating HZIF-8 into PS significantly increases the cell density (up to 1.4 × 10 9 cells cm −3 ) and decreases the average cell size (to 8.6 μm) under optimal foaming conditions (13.8 MPa, 100 °C). Compared to conventional ZIF-8 nanoparticles, the hollow structure of HZIF-8 facilitates more efficient CO 2 uptake, leading to a finer microcellular morphology, more stable foam expansion, and enhanced mechanical properties. These results demonstrate the potential of hollow MOFs in creating high-performance microcellular foams, with promising applications in energy-efficient insulation, lightweight packaging, and functional materials.
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
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Tao Xu,Yun Wang,Xiaofang Zhou,Xiaoli Zheng,Qun Xu,Zhimin Chen,Yumei Ren,Bo Yan
The recombination of photo-induced charges is one of the main issues to limit the large-scale applications in photocatalysis and photoelectrocatalysis. To improve the charge separation, we fabricate a novel type II 2D ultrathin TiO 2 /WO 3 ·H 2 O heterostructures with the assistance of supercritical CO 2 (SC CO 2 ) in this work. The as-fabricated heterostructures possess high photocatalytic activity for the degradation of methyl orange(MO) and high photocurrent response under simulated solar light (AM 1.5). For the TiO 2 /WO 3 ·H 2 O heterostructures, the MO solution could be degraded by 95.5% in 150 min, and the photocurrent density reaches to 6.5 μA cm −2 , exhibiting a significant enhancement compared with pure TiO 2 and WO 3 ·H 2 O nanosheets .
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
DYES AND PIGMENTS
·
2021
·
IF 4.889
Mengke Jia,Haina Hu,Xiaoqing Xiong,Lihua Lyu,Hongjuan Zhao,Shubiao Zhang,Jun Hou
Technology of supercritical carbon dioxide (scCO 2 ) dyeing has been used in dyeing synthetic and natural fibers . It is important to understand the scCO 2 dyeing mechanism owing to the possibility of using this knowledge to design dyes that are suitable for scCO 2 dyeing. Here, using the N-site and 4-site modification of 1,8-naphthalimide matrix, six fluorescent dyes ( 1 , 2 , 3 , 4 , 5 , and 6 ) with fluorescent properties were synthesized; dyeing performance and fluorescent images indicate that all the synthesized dyes can be utilized for scCO 2 dyeing wool fibers . Therefore, the dyed wool fibers possess not only conventional dyeing characteristics but also luminescent properties. Especially, the dyed wool fibers with solid free fluorescent dye 2 exhibit strong yellow-green fluorescence. Owing to the lack of proper fixation process, the fixation rate of these six fluorescent dyes on wool fibers was not relatively high. Thus, the dye 7 with an active group N-hydroxysuccinimide (NHS) was synthesized to improve the binding force between dyes and wool fibers and it can react with the –NH 2 group in wools, which results in that the fixation rate of the synthesized dye 7 reaches approximately 91% through chemical combination. Mass spectra prove that the byproduct of 7 reacting with the amino group of wool fibers is not corrosive to dyeing equipment, which realizes the eco-friendly fluorescent dyeing of wool fibers in scCO 2 . Our results proved that the fluorescent dyes with conjugated system can overcome the problem of fluorescence quenching in natural fibers. Meanwhile, our strategy of constructing fluorescent dyes and the proposed dyeing mechanism will be helpful to develop reactive disperse dyes that are suitable for scCO 2 dyeing.
研究领域:
化学
·
材料科学
·
纺织工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2024
·Vol. 141
·期 22
·e55444
·
IF 2.7
Donglin Li,Zi Wei,Lifen Li,Chang Peng,Lunneng Xu,Siwen Bi,Xuhuang Chen,Peng Yu
In this work, a facile in situ precuring and supercritical CO 2 (sc-CO 2 ) foaming technology is proposed to fabricate silicone rubber foam (SRF) with a tunable cell structure. Uncured silicone rubber is put into the autoclave to saturate sc-CO 2 directly, which not only shorts the saturation time but also accelerates the curing reaction in the precuring process. In the foaming process, cell nucleation is triggered by rapid release of pressure. The cell structure of SRF samples with cell size range of 9.45 to 128.09 μm, cell density range of 3.5 × 10 5 cells/cm 3 to 5.7 × 10 8 cells/cm 3 , and porosity range of 28.35% to 77.28% are successfully fabricated by controlling of precuring time, saturation pressure and foaming temperature. To guarantee the dimensional stability and optimize surface quality of SRF samples, in situ post-curing process is implemented within the foaming mold. With the increase of cell size from 9.91 to 128.09 μm, the compressive stress at strain of 75% decreases from 2.19 to 0.61 MPa, while the energy loss coefficient reduces from 35.4% to 16.9%, exhibiting excellent compression recovery steady. The new technique integrates the precuring, foaming process and post-curing into an autoclave to simplify the SRF procedure.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Linqiong Xu,Shaoping Qian,Wenge Zheng,Yongkang Bai,Yongqing Zhao
The cellulose acetate/poly(ethylene glycol) (CA/PEG) blend with a weight ratio of 50/50 was solution-blended followed by supercritical carbon dioxide foaming and the PEG leaching process. Interestingly, a bimodal open-celled structure (BMOCS) with networks is obtained. Large cells are developed from the cell nuclei formed during rapid depressurization, while small cells are formed by leaching of PEG out from the blend foams. The open-celled structure with networks is developed by the synergistic effect of leaching of PEG and rupture of some cell wall. The influences of foaming temperature and pressure on cellular structure for CA and CA/PEG blend foams were studied. The foam densities of blend foams after leaching PEG (0.18–0.41 g/cm3) are higher than those of CA foams (0.13–0.20 g/cm3). The leaching contents of PEG out from CA/PEG blend foams are in the range of 89.0%–99.1%.
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 CO2 Utilization
·
2021
·
IF 7.132
Tianbo Zhou,Yuxue Wang,Huanda Zheng,Bing Du,Laijiu Zheng
Traditional water medium dyeing of polyester-cotton fabrics consumes more water and energy, and causes serious environmental pollution in comparison with one-bath dyeing of single component fiber. To achieve sustainable dyeing of polyester-cotton blends, three reactive disperse dyes with s-triazine reactive group were synthesized, and supercritical CO 2 was used as solvent to conduct the waterless dyeing. The results showed that one-bath dyeing of polyester-cotton blends could be successfully realized with the synthesized dyes. Dyeing performance of the synthesized dyes was constantly improved with the extension of carbon chain on aniline. Compared with other two dyes, the optimal color strength of polyester-cotton blends was obtained with dye 3 using dimethylsulfoxide as co-solvent, and K/S values up to 6.4 were obtained at 100 °C, 20 MPa and 120 min with a dimethylsulfoxide concentration of 80 %. σ K/S values below 0.14 and washing and rubbing fastness above 4 were displayed for the colored samples. In addition, dyeing mechanism of polyester-cotton fabrics with the synthesized dyes was discussed combined with FT-IR measurement and stripping experiments.
研究领域:
纺织科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2022
·
IF 5.876
Jian-Lei Qi,Dan Zhou,Qin-Qin Xu,Jian-Zhong Yin,Kun-Peng Yu,Hai-Xin Sun
In recent years, single-atom catalysts (SAC) have emerged as a new frontier in the field of heterogeneous catalysis owing to their unique properties and minimized metal dosage. Herein, the Pd-ZIF-8 single-atom catalyst was successfully fabricated using ZIF-8 as support, and Pd(hfac) 2 as the precursor using the supercritical CO 2 deposition method. Aberration-corrected high-angle annular dark-field scanning transmission electron microscopy (AC-HAADF-STEM) images confirmed the formation of uniformly dispersed Pd atoms. Supercritical CO 2 has the advantage of zero-surface tension and high diffusibility, it can carry the molecules of Pd precursor into the micropores of ZIF-8. The dissolution and diffusion of precursor were observed by a visual view cell and the mechanism of the preparation was analyzed. Finally, semi-hydrogenation of phenylacetylene to styrene was performed to evaluate the catalytic activity of the prepared Pd-ZIF-8 catalyst. The conversion rate of 80.7% and selectivity of 92.2% were obtained at 70 °C and 4 h in the semi-hydrogenation of phenylacetylene.
研究领域:
催化化学
·
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2024
·
IF 6.9
Siqi Guo,Yuxue Wang,Huanda Zheng,Laijiu Zheng,Pengfei Lv
Traditional dyeing utilizes a substantial amount of water and necessitates the incorporation of significant quantities of dyes, auxiliaries, and salts, leading to the discharge of highly concentrated organic wastewater and severe water pollution issues. In this study, a novel pyrazolone benzothiazole disperse dye and its triazine disperse reactive dye were designed with the same yellow shade and synthesized. The results showed that the synthesized dyes could successfully realize one-step dyeing of cotton, polyester, and polyester-cotton in supercritical CO 2 . At 100℃, 24 MPa, 60 min, and 2.5 % (o.w.f.) of dye concentration, the K/S value of polyester-cotton fabric was 8 by using the same amount of disperse dye and disperse reactive dye. When disperse reactive dye was used at 100℃, 24 MPa, 60 min, and the concentration of 1.5 % (o.w.f.), the K/S value of cotton fabrics can reach 7.3, and their σ K / S values were less than 0.03 and 0.006, respectively. Moreover, polyester reached the maximum K/S value of 15.96 at 120°C, 24 MPa, 60 min, and a dye concentration of 2.0 % (o.w.f.) with disperse dye. The σ K / S value was below 0.045. The fastness of washing and rubbing was above 4. This study provides novel disperse dye structures and dyeing methods for ecofriendly textiles dyeing in supercritical CO 2 , especially for one-bath low temperature dyeing polyester-cotton fabrics.
研究领域:
纺织科学
·
染料化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yang Haoyu,Zhang Xiaoqi,Zhang Weiwei,Song Changyuan,He Suqin,Huang Miaoming,Liu Hao,Xu Wanlin,Zhu Chengshen,Liu Wentao
Lightweight, friction-resistant polyamide foam with exceptional mechanical properties represents a novel material with significant potential. In this study, we synthesized a series of high-toughness, bio-based polyamide materials characterized by low melting points, extensive processing temperature ranges, and robust low-temperature resistance. This was achieved through the copolymerization of bio-based components, including glutaraldehyde, sebacic acid, and caprolactam. Subsequent foaming using supercritical CO 2 was performed, substantially reducing foaming conditions and broadening the foaming range. Optimal foaming conditions were simulated, resulting in the production of various polyamide foams with differing foaming multiplicities, all exhibiting impressive tensile strength, compressive strength, low-temperature resistance, and friction resistance. Additionally, this study simulated the thermal insulation performance of polyamide foams across a wide array of practical working conditions. The results demonstrated that these foams possess low thermal conductivity and excel in actual thermal insulation performance. Therefore, they present significant promise as energy-saving and environmentally friendly materials in applications such as building thermal insulation, electrical insulation, and protective systems. As a sustainable solution, these bio-based polyamide foams hold great potential for advancing energy efficiency in construction, thermal management of electrical appliances, and protective applications.
研究领域:
材料科学
·
环境科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Luwei Zhang,Haijuan Kong,Mengmeng Qiao,Xiaoma Ding,Muhuo Yu
Constructing the nondestructively chemical linking between organic phase and inorganic particles has become a hot direction for polymeric surface modification due to the rising demand of anti-ultraviolet (UV) products. Herein, aramid fiber (AF) with coordination of ZnO was developed by a facile supercritical CO 2 (Sc-CO 2 ) drying technique to improve its UV resistance and interfacial-adhesion. Through adjusting the Zn 2+ concentrations, the ZnO nanoparticles (NPs) with different decentralized system were synthesized and deposited to AF surface with stirring and the both were subsequently dried in Sc-CO 2 fluid for bonding. Results indicate that coordination between ZnO NPs and AF was established with the formation of C O Zn bond and the grafting yield of NPs was up to 34.23%. This ZnO-bonded fiber not only shows the greatly enhanced interfacial shear strength (IFSS) and UV resistance overcoming the two inherent defects of AF, but it was also endowed with higher mechanical and thermal performances than the original. For the AF-ZnO fibers in the optimum conditions, its IFSS was severely increased by 68.2%, compared to the pure AF, meanwhile the tensile strength retention after 216 h-UV irradiation is as high as 93.1%. Additionally, those fibers were obtained a better heat-resistant properties and mechanical properties, as the tensile strength and modulus, break elongation and energy were improved by 13.7%, 8.7%, 13.4% and 15.7%, respectively. Therefore, this research shows a fantastic success for nondestructively improving the interfacial-adhesion properties and UV resistance of AF.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 13
·7663-7675
·
IF 4.21
Zhao Yifan,Zhong Kai,Liu Wei,Cui Sheng,Zhong Ya,Jiang Shengjun
Hydrophobic microcrystalline cellulose (MCC) aerogel is synthesized using microcrystalline cellulose and NaOH/urea solution as precursors through the sol–gel route and alkylation hydrophobic coagulation bath. Especially, the effects of different drying modes and content of MCC on the physical chemistry properties are investigated. The results show that samples using nano-self-assembly method combined supercritical CO 2 drying possess loose and uniform porous three-dimensional network structure. The specific surface areas before and after modification are 180.28 m 2 /g and 154.37 m 2 /g with average pore sizes at 22.58 nm and 25.71 nm. The hydrophobic angle is up to 154.3°, the maximum adsorption efficiency can reach 12 g/g, which is also of reusability after 5 adsorption tests. This hydrophobic MCC aerogel has excellent adsorption performance, and simple, rapid, effective oil contamination treatment which is of use in oil adsorption.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Food Analytical Methods
·
2025
·
IF 3
Zeng Jingxuan,Zheng Haoyue,He Rifeng,Zhou Dan,Peng Xiaoyan,Mo Nan,Mo Zhonghai,Zhou Xue,Ge Fahuan
In this paper, we proposed a new supercritical CO 2 defatting—pH multistage regulation extraction method (SD-PMRE) of high water soluble walnut protein isolate (HWPI), by investigating the effects of PMRE, three defatting methods, and walnut seed coat on the functional properties of HWPI. The results showed that HWPI had high yield of 48.56% and high protein content of 87.58%. More importantly, it had a solubility of 91.58%, significantly higher than walnut protein isolate (WPI) with the highest solubility. Meanwhile, other functional properties of HWPI were greatly improved, with emulsification capacity and stability of 118.07 m 2 /g and 91.03%, and foaming capacity and stability of 129.17% and 89.29%, respectively. Through the SD-PMRE, the problem of WPI’s poor functional properties such as solubility was solved, avoiding the shortcomings brought by modification methods and expanding the application of walnut protein in the fields of food and medicine.
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
危险品化学品经营许可证（带存储）