ENERGY
·
2022
·
IF 8.857
Song Lv,Yishuang Ji,Yitong Ji,Zuoqin Qian,Juwen Ren,Bolong Zhang,Yin Lai,Jiahao Yang,Zhihao Chang
Radiative cooling technology has broad application prospects because it does not require any energy input, which has drawn much attention from researchers. However, most radiative coolers are expensive and complex. Here, the finite difference time-domain (FDTD) method is used for material selection and film parameter optimization. An organic composite film of polymethyl methacrylate (PMMA) embedded with titanium dioxide (TiO 2 ) particles is proposed, which has a simple structure and low cost. A 24-h continuous experiment was conducted to evaluate the radiative cooling performance of TiO 2 /PMMA film by using self-made devices. Experimental results show that the temperature of the radiative cooler can be 11 °C lower than the ambient, the average of 4.8 °C and the minimum of 2 °C below ambient during the day. Furthermore, a mathematical model has built to investigate the radiative cooling performance of the TiO 2 /PMMA device. The effects of environmental parameters, such as wind velocity , ambient temperature, relative humidity and solar irradiance were analyzed. This study can provide a new thinking and some practical guidelines for the design and application of radiative coolers.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
OPTICAL MATERIALS
·
2021
·
IF 3.08
Xiaotong Gao,Zhilong Qin
Polymeric nanoparticles with near white fluorescence were prepared from melamine and glyoxal through solvothermal reaction in a single step. The colour of the fluorescence of the products was excitation wavelength dependent, which was near white under UV irradiation and gradually shifted to red when excitation wavelength shifted from 300 nm to 570 nm. The influence of the preparation conditions on the fluorescence intensity was investigated and the morphology of the products was confirmed by HRTEM and AFM. The size of the particles was mainly in 30–80 nm range. A quantum yield of 22% could be achieved under the optimum condition. FTIR and NMR indicated that the products were typical Schiff-base networks. Effect of solvents on the fluorescence property was also examined and the strongest emission was obtained in DMSO . To verify the origin of the different colour of the fluorescence, the products were analyzed using electrophoretic methods and the results indicated that dependence of the emission colour was not correlated to the variation of the particle size. The possible origin of the fluorescence was also proposed and the products can be non-toxic alternatives of inorganic quantum dots for white light emission.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Catalysis Science & Technology
·
2020
·Vol. 10
·期 13
·4412-4423
·
IF 5.721
Qiang Liu,Zhenbo Zhao,Masahiko Arai,Chao Zhang,Ke Liu,Ruhui Shi,Peixuan Wu,Zhuangqing Wang,Weiwei Lin,Haiyang Cheng,Fengyu Zhao
The transformation of γ-valerolactone (GVL) into 1,4-pentanediol (1,4-PDO) and 2-methyltetra-hydrofuran (2-MTHF) in the presence of H2, one of the useful biomass conversion and utilization processes, was investigated with monometallic Cu/Al2O3 and bimetallic ZnCu/Al2O3 catalysts. A 10 wt% Cu-loaded monometallic catalyst produced 1,4-PDO and 2-MTHF in comparable quantities at a medium conversion (∼50%). When Zn was added in a range of Zn/Cu molar ratios of up to 2, in contrast, the catalysts yielded 1,4-PDO in a high selectivity of about 97% at low and high conversion levels. In addition, the 1,4-PDO selectivity over the ZnCu/Al2O3 catalysts remained almost unchanged during recycled runs. That is, the addition of Zn to Cu/Al2O3 switched the product selectivity and improved the catalyst stability and reusability. Furthermore, the physicochemical properties of the catalysts were characterized by several methods including XRD, TEM, TPR, XPS, FTIR of adsorbed pyridine, and so on. On the basis of those results, the relationships between the catalytic performance (activity, selectivity, and reusability) and the catalyst structural features were discussed.
研究领域:
催化化学
·
生物质转化
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2021
·Vol. 37
·期 2
·304-310
·
IF 1.307
Wang Dong,Li Zhenwei,Zhang Qian,Liu Jie,Yang Yu,Han Jishu,Wang Lei
Silicon(Si) with high theoretical capacity has attracted tremendous attention as the next-generation anode material for Li-ion batteries, but the huge expansion during cycling restricts its practical application. Designing a low-cost, accessible robust network binder is a facile and effective approach to suppress the volume change effect and achieve the commercial application of Si anodes. Different previous studies focused on the network binder macromolecule main chain, this manuscript pays attention to the study of small-molecule cross-linker. Herein, cross-linked network binders using alginate acid and two kinds of cross-linkers, i.e., D -sorbitol and isosorbide(Alg-DS and Alg-IS binders) are synthesized. It was found that not only the chemical structure of the cross-linker but also the physicochemical property, such as melting point affect greatly the mechanical properties of the network binder. As a result, the Si anode with an Alg-DS binder dried below the melting point of DS shows the best cycling stability with a high capacity of 2249.8 mA·h/g and a retention rate as high as 95.9% after 100 cycles. This study gives a new view to design robust network binders for stable Si anodes.
研究领域:
材料科学
·
电化学
·
电池技术
✓ 已验证
DOI
高影响因子
CHEMICAL PAPERS
·
2021
·Vol. 75
·期 10
·5561-5569
·
IF 2.097
Shao Tantan,Gong Yilu,Chen Xiaolong,Chen Lijun
Novel self-crosslinking long fluorocarbon acrylate polymer latex has been successfully prepared by semi-continuous seeded emulsion polymerization with methyl methacrylate(MMA), butyl acrylate (BA), dodecafluoroheptyl methacrylate (DFMA) and hydroxypropyl methacrylate(HPMA) as main monomers, 10-undecylenic acid (10-UA) and diallyl phthalate (DAP) as functional monomers. During the latex polymerization, the monomers were emulsified by the mixed surfactants of nonionic surfactant alcohol ether glycoside (AEG) and anionic surfactant sodium dodecylbenzene sulfonate (SDBS), and initiated by potassium persulfate (KPS). The resultant latex showed excellent properties. The chemical composition of latex was determined with Fourier transform infrared spectrum (FTIR) and the glass transition temperature (Tg) of polymer was detected by differential scanning calorimetry (DSC) and the water repellency of the prepared film was measured by water contact angle measurement (WCA). The reaction conditions were optimized and obtained as follows: the optimal monomer dosage was MMA: BA: DFMA: HPMA = 12.75:12.75:0.9:1.2, the amount of 10-UA and DAP was both 4% of all monomers, the dosage of AEG: SDBS was 5% (1:1) and KPS was 0.5%, respectively. The result indicated that the conversion of the mixed monomers was more than 98% and the coagulation was less than 1% and the resultant latex also had the outstanding appearance and latex performance.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 7
·2930-2940
·
IF 3.288
Jun Zhu,Jie Li,Chao Sang,Yunjun Luo
Waterborne polyurethane (WPU) based polymeric dyes with anthraquinone chromophores were developed to realize coloring textiles and improve color fastness. The preparation of polymeric dyes through the reaction of 1,4-diamino-2,3-diphenoxyanthraquinone (DV26) and NCO-terminated prepolymer was monitored via UV absorption spectroscopy. With the progress of the reaction, the intensity of the absorption peak of the primary amine group at 586 nm decreased as a function of reaction time. Thus, the conversion of DV26 at different times and the reaction end point could be determined. The reaction mechanism corresponded to an autocatalytic reaction equation, basically. In addition, the results of performance tests showed that the polymeric dyes exhibited good emulsion stability, ultra-low migration percentages, good water resistance and excellent thermal stability. Moreover, the application properties of DWPU on coated polyester fabrics were satisfactory.
研究领域:
材料化学
·
纺织科学
·
染料化学
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Yunlei Zhou,Yunpeng Qu,Liting Yin,Wenna Cheng,Yongan Huang,Runhua Fan
In this work, a type of unique flexible and ultra-stretchable microtextiles was fabricated by coassembly of Ag nanowires (AgNWs) and thermoplastic polyurethane (TPU) microfibers . The microtexiles show tunable and weakly negative permittivity at a low filler content of 1.0–2.4 wt%. The resonance-induced negative permittivity observed in the AgNW/TPU microtextiles below the percolation threshold ( f c ) is attributed to the electric dipole moment of the isolated AgNWs, and this phenomenon can be explained by the Lorentz model. When the AgNW content exceeds the f c , the low-frequency collective plasma oscillation of the AgNW networks in the composites triggers the tunable plasma-type negative permittivity, which agrees with the Drude model. Additionally, the inductive character of the composites was assessed with the reactance spectra. The as-prepared Ag/TPU microtextiles could be a good candidate for the applications of garment integrated electronic, novel sensors, electromagnetic cloaking, and wearable electronic devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
Advanced Industrial and Engineering Polymer Research
·
2019
·
IF 0
Han Hu,Ruoyu Zhang,Zhengyang Kong,Kai Wang,Wu Bin Ying,Jinggang Wang,Jin Zhu
Poly (butylene furandicarboxylate) based poly (ether ester), with poly (ethylene glycol) (PEG) molecular weight from 600 to 20 K g mol −1 and mass fraction of hard segments fixed at 50%, are synthesized through transesterification and melt polycondensation. When M n (PEG) is less than 1500 g mol −1 , the copolymers tend to be homogeneous. The tendency of microphase separation is facilitated by the increasing M n (PEG). The mechanical properties and water swelling are influenced by M n (PEG), equilibrium water-uptake and PEG crystals. Elastic modulus of samples with no PEG crystals vary from 34 to 64 MPa, with elongation at break exceeding 1000%. The hydrolytic degradation is strongly affected by M n (PEG), degradation medium and alkalinity. The degradation of copolymers with short PEG (<1500 g mol −1 ) could be accelerated by ions and increasing alkalinity in medium. For copolymers with M n (PEG) from 2 K to 6 K g mol −1 , the degradation rate is relatively slow, due to relatively long PBF segments and improved PBF crystals hindering the hydrolysis of ester bond. For copolyesters of PBF50-PEG10K and 20 K, the oxidation of PEG dominates the degradation behavior while the PBF segments can hardly be damaged. The drastic degradation of these samples takes place in the solutions of pH = 12, suggesting the high alkalinity can break the long PBF segments. The distinct degradation behavior of the copolymers conduces to realize tuned hydrolysis for different biomedical applications.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
·
2022
·
IF 7.926
Xiaona Dong,Ruonan Feng,Yuanming Jiang,Tianming Cai,Canlan Jiang
Soil contamination by triphenyl phosphate (TPHP) has posed a potential threat to human health. In this study, the degradation of TPHP by different chemical oxidation methods, including H 2 O 2 , persulfate (PS), peroxymonosulfate (PMS), ferrous ions (Fe 2+ ) activated H 2 O 2 , Fe 2+ activated PS, heat activated PS (heat-PS), and heat activated PMS, was compared. Heat input could promote the activation of PS to generate highly reactive species (HRS) and the aqueous availability of TPHP for more efficient degradation of TPHP in soil than other methods. As reaction temperature rose to melting point of TPHP (50 o C), the degradation rate sharply increased. The activation energy ( Ea ) of TPHP degradation in soil was caculated to be 115.57 kJ mol -1 . The oxidation capacity per unit PS was about 22.0 M -1 . Sulfate radicals (SO 4 •− ) and hydroxyl radicals (•OH) were the major HRS for TPHP degradation in heat-PS system. With increasing of soil-water ratio, the inhibitory effect of soil organic matter (SOM) on TPHP degradation was significantly enhanced. The degradation efficiency was highest under weakly acidic conditions (pH ≈ 4.8). Cl − significantly inhibited the degradation of TPHP in heat-PS system, while HCO 3 − and H 2 PO 4 − had little effects on the degradation of TPHP. After reaction, TPHP in soil could be degraded to be less toxic para -hydroxy triphenyl phosphate ( p -OH-TPHP), diphenyl phosphate (DPHP), and phosphate ions (PO 4 3− ). This study discloses a sustainable strategy for the remediation of OPFRs-contaminated soil by utilizing heat-PS method.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
HORTSCIENCE
·
2021
·Vol. 56
·期 8
·909-914
·
IF 1.455
Asma Mohammed Saeed Al-Kubati,Baoshan Kang,Liming Liu,Aqleem Abbas,Qinsheng Gu
Zucchini yellow mosaic virus (ZYMV) causes serious damage to cucurbit crops worldwide and can be spread by aphids, by mechanical injury, and in seeds. With the popularization of cucurbit grafting, the use of susceptible rootstock has increased the risk of ZYMV infection in cucurbit crops. In China, the bottle gourd (Lagenaria siceraria) is a widely used rootstock in grafted watermelon production. However, few resistant bottle gourds are available commercially. This study developed bottle gourd lines resistant to ZYMV using ethyl methanesulfonate (EMS) mutagenesis. A new mutated bottle gourd population (M1) was generated by treating seeds with EMS. Diverse phenotypes were observed in the seedlings, flowers, and fruit of M2 plants, some of which are of potential commercial interest, such as dwarfing and different fruit shapes. Based on the M2 phenotypes, 106 M3 lines were selected and screened for resistance to ZYMV by mechanical inoculation and agroinfiltration. Nine M3 lines were resistant to ZYMV during three tests. One inbred M4 line (177-8) was developed and showed stable resistance and no virus when tested using a double-antibody sandwich enzyme-linked immunosorbent assay (DAS-ELISA) and polymerase chain reaction. These resistant lines are promising materials for developing watermelon rootstock and exploring resistance genes as new ZYMV-resistant resources. EMS induction could be a practical strategy for creating resistant cucurbit crops.
研究领域:
植物学
·
遗传学
·
作物科学
✓ 已验证
DOI
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 44
·27183-27192
·
IF 3.361
Jie Liu,Feifei Zhang,Zhendi An,Wanpeng Shi,Hong Li
An amino-terminated hyperbranched polymer (A-HP) was employed to modify leather buffing dust (BD) to prepare functional filler, hyperbranched buffing dust (HBD). The structure and morphology of BD and HBD were characterized by XPS, DSC and SEM. Furthermore, HBD was added into the typical solvent type polyurethane (PU) to prepare a wetting PU film which was used as the coating for synthetic leather. By changing the dosage of HBD, the filler species, the properties of the porous structure and mechanical strength of the PU film were analyzed by SEM, DMA and so on. The experimental results indicated that with the increase of the dosage of HBD, the porous structure of the PU film increase. The content of the N element for BD increases from 4.27% to 7.29%. After modification and ball milling, the fineness of most fibers was in the range of 6.7–6.9 μm. The fiber dispersion state of HBD was more uniform. The Tg of the PU film with HBD is −8.67 °C, while for lignin is −8.41 °C, indicating that the wetting PU film filled with HBD has better flexibility at low temperature.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
CATALYSIS LETTERS
·
2024
·
IF 2.3
Mei Mingjie,Zhao Jiangui,Fang Hu,Sun Zuowei,Xue Weichao,Fu Haiyan,Li Ruixiang,Chen Hua,Li Chen,Yang Chunji,Zheng Xueli,Yuan Maolin
1,4-Butanediol, an important chemical raw material, especially as the monomer of engineering plastic polyethylene terephthalate (PBT), plays a pivotal role in contemporary chemicals. A promising parallel approach is the linear-selective hydroformylation of inexpensive allyl acetate, which is economical yet challenging. Herein, we describe an atom-economic approach characterized by high selectivity for synthesizing 4-oxobutyl acetate through rhodium-catalyzed hydroformylation using allyl acetate. This protocol affords the intermediate of valuable 1,4-butanediol in excellent yield (up to 95%) and exhibits excellent regioselectivity (linear/branched up to 164) under mild conditions (60 °C, 10 bar of syngas), effectively minimizing the formation of decomposed byproducts. The success of this protocol hinges on the use of a "Rh/POP-type ligand" in combination with either acetic acid or bulky anionic salts as additives. Preliminary mechanism studies show that the use of CH 3 COOH facilitates the formation of a tridentate κ 3 -P,O,P-coordination, which prevents the coordination of carbonyl with the Rh center, leading to the relatively high linear selectivity of 4-oxobutyl acetate. Furthermore, the successful application of this protocol in synthesizing 4-oxobutyl acetate at a scale of 3.8 g, employing low Rh-loading (0.05 mol%), highlights its potential for industrial applications. Graphical Abstract
研究领域:
化学工程
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）