Processes
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2022
·Vol. 10
·期 7
·1302
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IF 3.352
Hailun Ren,Weihong Li
3-hydroxybutyraldehyde (3-HBA) is mainly employed to synthesize 1,3-BDO (1,3-butanediol), which is one of the most important components in cosmetics moisturizers. In this study, a series of composite oxide catalysts were prepared by bringing alkaline earth metal Ca and rare earth metal La to the composite oxide MgO/Al2O3, which were made through the co-precipitation method. These catalysts were applied in the synthesis of 3-HBA through acetaldehyde (AcH) condensation. The structure, texture, and acidic properties of these catalysts were characterized using various characterization methods, and the effects of catalyst composition, reaction temperature, reaction pressure, and residence time on the conversion of AcH were investigated as well. The results showed that the introduction of Ca and La weakened the acidic property and enhanced the basic property, which favored the AcH condensation to synthesize 3-HBA. At a temperature of 20 °C, pressure of 200 kPa, and residence time of 70 min, 0.5%La-2.3%Ca-2MgO/Al2O3exhibited a better catalytic activity, and the conversion of AcH reached 95.89%. The selectivity and yield of 3-HBA were 92.08% and 88.30%, respectively. The stability test indicated that the high AcH conversion could be maintained for 5 h.Keywords:composite oxides;acetaldehyde;condensation catalyst;3-hydroxybutyraldehyde
研究领域:
催化化学
·
绿色化学
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DOI
高影响因子
Materials Letters-X
·
2021
·
IF 0
Mei Qin,Daqing Liu,Xin Meng,Zhang Dai,Shufang Zhu,Na Wang,Xu Yan
At the beginning of 2020, the whole world suffered from the new coronavirus (COVID-19). Wearing a mask was believed to reduce the spread of the virus. The core material of a mask required good air permeability and efficient filtration. Electrospun materials may match these requirements. By electrospinning, we prepared polyvinyl butyral (PVB)/berberine hydrochloride (BH) membranes onto the spunbonded nonwovens. The composite meshes showed porous structures, good air permeability (164 ± 16 mm/s) and air filtration efficiency 96.4% for PM 0.3, 100% for PM 2.5, with pressure drop (108 Pa). Moreover, with the addition of BH, the as-spun membranes showed good antibacterial property for staphylococcus aureus. Furthermore, the prepared PVB/berberine membranes had good hydrophobicity with water contact angle higher than 140°. These results indicated that the fabricated PVB/berberine membranes have potential applications in mask and air filtration.
研究领域:
材料科学
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生物医学工程
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环境科学
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DOI
AATCC Journal of Research
·
2025
·
IF 1.2
Kangjing Hong,Qiaoli Lyu,Shujuan Zhang,Guohui Wang,Chenglong Wang,Jinhuan Zheng
Due to the increasing use of laminated safety glass, the issue of polyvinyl butyral (PVB) resource waste has become increasingly serious. The complex composition of waste PVB presents significant challenges for recycling and application. In this paper, PVB was first grafted with phthalic anhydride (PA) to investigate the effect of the modification process on the coating film and coated fabric, thereby guiding the modification research on recycled PVB (rPVB) and successfully preparing rPVB-P. The results indicate that the optimal modification process for PVB involves a modification temperature of 70°C, a modification time of 6 h, and 6 g of PA. The feasibility of applying the prepared coated fabric in the field of trademark ribbon fabric was examined. The surface structure of the coated fabric, prepared with a kaolin mass fraction of 30%, was found to be uniform, with an ink contact angle of 20.32°, and the color fastness to washing and rubbing reached levels 4–5. The overall performance of the coated fabric prepared with rPVB was similar to that of the PVB-coated fabric, demonstrating that rPVB can effectively replace PVB for coating preparation.
研究领域:
材料科学
·
纺织工程
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DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Qianchun Zhang,Yuxian Zhao,Zhaoru Ban,Li Jiang,Shan Tang
Cataluminescence (CTL) sensors are among the most simple, inexpensive, sensitive, and selective tools for gas sensing. This study presented a highly efficient and selective CTL sensor system based on mesoporous SiO2 nanomicrospheres for the quick and sensitive analysis of isobutyraldehyde. Furthermore, its response intensity was 12.7 times higher than that of a nonmesoporous SiO2-based sensor. The constructed CTL sensor exhibited a good linear range (R2 = 0.997) for detecting isobutyraldehyde, spanning 3.11–311 ppm, with a low detection limit of 1.1 ppm. This enabled successful analysis of trace isobutyraldehyde in real samples. Finally, the CTL mechanism of this sensor was further explored. This study presents an approach for the quality detection of an important volatile organic compound, isobutyraldehyde, by a mesoporous-based CTL sensor.
研究领域:
材料科学
·
分析化学
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2017
·
IF 2.843
Bai Yang Zhou,Xi Yan Lin,Kai Wang,Guang Sheng Luo
In this work, we established a cascade cooling and two-step feeding technology for the energy-saving and fast synthesis of polyvinyl butyral (PVB) with a low molecular weight in a microreactor system. Because of the strong mixing capacity of the microreactor and the relatively higher initial reaction temperature of 60 °C compared to existing methods, the condensation reaction between the raw materials of poly(vinyl alcohol) (PVA) and n-butanal was highly intensified and the reaction rate was faster, along with less energy consumption for cooling. By reducing the aging temperature to 40–55 °C, which is far below the glass transition temperature of PVB, we could also lower energy consumption and improve the morphology of PVB. Benefiting from the new technology, the acetalization degree (AD) of PVB reached more than 78%. By applying the two-step n-butanal feeding method in the new technology, the utilization ratio of n-butanal was dramatically increased to more than 99.7%, which was the best result among current published reports. Moreover, a PVB product with a low molecular weight has been successfully prepared with the new technology. This work demonstrates a promising continuous microreaction process for greener and energy-saving synthesis of PVB.
研究领域:
化学工程
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材料科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Xiaolei Song,Ying Song,Juan Wang,Qiang Liu,Zhenxin Duan
In this work, mesoporous alumina nanofibers were synthesized using polyvinyl butyral (PVB) as polymer template via electrospinning technique. Both alumina precursor sol and precursor solution mixed well with PVB ethanol solution in temperature range of 40–80 °C to attain transparent spinning solutions. Continuous precursor nanofibers with rough and warped surface were obtained after electrospinning. Calcination of precursor nanofibers in air yielded the opening of mesopores in alumina nanofibers. Rapid escape of gaseous products and phase separation between PVB and alumina precursors were responsible for the formation of porous framework.
研究领域:
材料科学
·
化学工程
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2021
·
IF 8.067
Jing Wang,Ning Wang,Mengnan Liu,Chengyue Ge,Baorong Hou,Guichang Liu,Wen Sun,Yiteng Hu,Yanli Ning
Hexagonal boron nitride ( h -BN) fillers are incorporated into poly(vinyl butyral) (PVB) coatings to improve the corrosion protection performance of copper. It has been revealed that the h -BN fillers exhibit an excellent dispersiblility in PVB coating due to the non-covalent interactions between h -BN fillers and the PVB molecules. Electrochemical characterization reveals that the corrosion resistance of the BN-reinforced PVB (BN-P) coating is 5–6 orders of magnitude higher than that of the pristine PVB coating. Photographs and metallography show that the copper substrate beneath the BN-P coating does not suffer from corrosion after immersion for 2 months, indicating that the BN-P coating can provide a long-term protective barrier for the underlying copper substrate. Loading 0-0.25 g h -BN fillers in 2.0 g PVB, the corrosion protection performance increases with increasing the loading of h -BN fillers. The scratch test results suggest that h -BN fillers do not accelerate copper corrosion when the BN-P coating is damaged.
研究领域:
材料科学
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电化学
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表面工程
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DOI
高影响因子
JOURNAL OF BIOACTIVE AND COMPATIBLE POLYMERS
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2017
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IF 1.31
Bin Liu,Jiangying Kuang,Leishan Shao,Xinyuan Che,Fei Wang,Yinghan Wang
A series of poly(ether imide)-graft-poly(vinyl acetate) copolymers with different molecular weights were synthesized successfully and characterized using Fourier transform infrared spectroscopy, ultraviolet–visible spectroscopy, proton nuclear magnetic resonance, gel permeation chromatography, differential scanning calorimeter, thermogravimetric analysis, and X-ray photoelectron spectroscopy analyses. These copolymers were used to fabricate honeycomb-structured porous films using the breath figure templating technique. The surface topology and composition of the highly ordered pattern film were further characterized using a scanning electron microscopy. The results indicated that the poly(ether imide)-graft-poly(vinyl acetate) graft molecular weight ratio influenced the breath figure film surface topology. A model was proposed to elucidate the stabilization process of the poly(ether imide)-graft-poly(vinyl acetate)-aggregated architecture on the water droplet–based templates. In addition, cell viability has been investigated via 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide test, and the cell morphology on the honeycomb-structured poly(ether imide)-graft-poly(vinyl acetate) porous film has been evaluated using a fluorescence microscope. This porous film is shown to be suitable as a matrix for cell growth.
研究领域:
材料科学
·
生物医学工程
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产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Wenwen Luan,Chunyu Wang,Zuoxiang Zeng,Weilan Xue,Fei Liang,Yu Bai
In this work, the samples of polyvinyl butyral (PVB) with an average degree of acetalization of 79.56% and the average molecular weight of 68.696 kg·mol −1 were prepared by polyvinyl alcohol (PVA) and n-butyraldehyde, catalyzed by p-Toluenesulfonic acid (PTSA). The intrinsic viscosities of PVB were measured in ethanol/water solutions in the temperature range of 293.15–313.15 K. The expansion factors of PVB molecular chains were calculated with the intrinsic viscosity data. The related thermodynamic parameters were derived from the temperature dependence of expansion factors and results indicate that the quality of mixed ethanol/water solvents for PVB solutions decreases with the increase of temperature and the volume fractions of water.
研究领域:
高分子化学
·
物理化学
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产品关联
DOI
高影响因子
MOLECULES
·
2024
·
IF 4.2
Qianchun Zhang,Xixi Long,Shan Tang,Li Jiang,Zhaoru Ban,Yanju Chen,Runkun Zhang
A simple, rapid, and reliable method for detecting harmful gases is urgently required in environmental security fields. In this study, a highly effective cataluminescence sensor based on SiO 2 /MIL-53(Al) composites was developed to detect trace isobutylaldehyde. The sensor was designed using isobutylaldehyde to generate an interesting cataluminescence phenomenon in SiO 2 /MIL-53(Al). Under optimized conditions, a positive linear relationship was observed between the signal intensity of the cataluminescence and isobutylaldehyde concentration. The isobutylaldehyde concentration range of 1.55–310 ppm responded well to the sensing test, with an excellent correlation coefficient of 0.9996. The minimum detectable concentration signal-to-noise ratio ( S/N = 3) was found to be 0.49 ppm. In addition, the sensor was effectively utilized for analyzing trace isobutylaldehyde; the analysis resulted in recoveries ranging from 83.4% to 105%, with relative standard deviations ( RSDs ) of 4.8% to 9.4%. Furthermore, the mechanism of cataluminescence between SiO 2 /MIL-53(Al) and isobutylaldehyde was explored using GC–MS analysis and density functional theory. We expect that this cataluminescence methodology will provide an approach for the environmental monitoring of isobutylaldehyde.
研究领域:
环境科学
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材料科学
·
化学
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产品关联
DOI
PubMed
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 34
·17715-17724
·
IF 6.895
Ruzhan Qin,Mingjun Hu,Xin Li,Li Yan,Chuanguang Wu,Jinzhang Liu,Haibin Gao,Guangcun Shan,Wei Huang
As a new class of two-dimensional transition-metal carbides and carbonitrides, MXenes have been widely used in energy storage, sensing, catalysis, electromagnetic interference shielding and other fields. It is a challenge to simultaneously realize a sensor with extremely high sensitivity, wide detection limits, low power consumption and good mechanical stability. In this work, taking advantage of the high conductivity of MXenes and the porous structure of polyvinyl butyral, a highly sensitive piezoresistive sensor was fabricated. The fabricated MXene/PVB-based sensor exhibits high sensitivity and reliability with a factor of ∼11.9 kPa−1, ∼1.15 kPa−1 and ∼0.20 kPa−1 in the ranges of 31.2 Pa–312 Pa, 312 Pa–62.4 kPa and 62.4 kPa–1248.4 kPa, respectively. The sensor has a wide detection range (∼31.2 Pa to ∼2.205 MPa), low detection limit (6.8 Pa), low detection voltage (0.1 mV), low power consumption (∼3.6 × 10−10 W), fast response time (∼110 ms) and good mechanical stability (over 10 000 maximum-pressure cycles). Moreover, it is demonstrated that the sensor can detect subtle bending and release activities of humans, including arterial pulses and voice signals, which makes it potentially suitable to be used as a wide detection range, highly sensitive and low power consumption piezoresistive sensor. This work provides a new avenue to expand the application of MXene-based flexible pressure sensors with a wide sensing range and ultra-low power consumption.
研究领域:
材料科学
·
传感器技术
·
生物医学工程
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2019
·
IF 2.752
Xiaoling Ma,Zhenlin Lv,Hongbin Tan,Caixia Wang,Lingyu Li,Yixia Wang
Yttrium aluminum garnet (YAG) nano-fibers were obtained by electrospinning using aluminum and yttrium nitrates as initial materials. Coordination agent and spinning additive influences on sol spinnability were analyzed. A stable spinning precursor sol was prepared using citric acid as a coordination agent and polyvinyl butyral as a spinning additive. Linear links were formed in precursor sol ∼4 nm in diameter. Spinning voltage effect on the fiber diameter was also studied. YAG phase was obtained after the gel fibers were sintered at 800 °C. The nano-fibers with diameter of 80–200 nm were prepared at 24 kV. YAG crystal grains were linked together forming nano-fibers.
研究领域:
材料科学
·
纳米技术
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）