INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2016
·
IF 2.567
Guozhen Wang,Xuefeng Tan,Hui Lv,Mengmeng Zhao,Min Wu,Jinping Zhou,Xumu Zhang,Lina Zhang
The catalytic transformation of the most abundant cellulose to valuable platform chemicals is one of the significant issues to overcome the shortage of fossil fuels. Herein, we reported the first example of Ru-based homogeneous catalyst for the highly selective conversion of cellobiose and ball-milled cellulose to hexitols (including sorbitol, mannitol, and 1,4-sorbitan) under an acidic condition with the yield of 94.5% and 56.4%, respectively. The main features of this catalytic system were the high conversion efficiency of biomass, mild reaction condition (100 °C), and low catalyst loading, which was 1/20 of the related Ru/C heterogeneous catalyst. This work opened up a new avenue for the transformation of cellulose to hexitols under mild conditions.
研究领域:
化学工程
·
生物质能
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Xing Cao,Ruiqi Zhang,Ning Zhang,Lei Chen,Dongming Chen,Xuebing Li
Organic phase change materials (PCMs) such as fatty acids and fatty alcohols are often trapped by inherent low thermal conductivity for thermal energy storage in buildings. The present study is devoted to ameliorating this problem from an innovative perspective of introducing bio-sourced additive. To promote performance of binary eutectic PCM comprising lauric acid (LA) and 1-hexadecanol (HD), the composite PCMs are developed, where the powdered seashell waste is added as thermal enhancer, and their thermo-physical properties are characterized via DSC, FT-IR, SEM, TGA, cooling curve analysis, accelerated thermal cycling test together with thermal conductivity measurement. Meanwhile, the impacts of two particle sizes, five mixing ratios between two different sizes and two modification approaches of seashell powder (SP) are surveyed meticulously. Experimental results turn out that 80-mesh SP and 300-mesh SP are both capable of providing greater thermal conductivity when dispersed in LA-HD eutectic PCM, and the enhancement level of thermal conduction is even higher for composite PCM containing 300-mesh SP than for composite PCM containing TiO 2 powder. Besides, the thermal conduction ability is strengthened to the maximum extent when 80-mesh SP and 300-mesh SP are combined at mass ratio of 3:7, while the same situation also occurs when seashell powder is treated by high-temperature calcination. The resultant composite PCM possesses encouraging melting temperature and melting enthalpy, and its thermal stability and reliability are well approved. Therefore, we conclude that the seashell powder has the expectable competence to realize performance improvement of organic PCM for application in buildings for thermal energy storage.
研究领域:
建筑材料
·
能源储存
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 5
·498
·
IF 2.935
Wanyong Yu,Na Han,Yongqiang Qian,Xingxiang Zhang,Wei Li
Cellulose was premodified by short-chain fatty acid anhydrides, such as acetic anhydride (CA), propionic anhydride (CP), and butyric anhydride (CB), followed by grafting of polyoxyethylene (2) hexadecyl ether (E2C16) using toluene-2,4-diisocyanate as a coupling agent. The feeding molar ratio of E2C16and the anhydroglucose unit (AGU) was fixed at 4:1, and then a series of CA-g-E2C16, CP-g-E2C16, and CB-g-E2C16copolymers were successfully prepared. The structures and properties of the copolymers were characterized using FTIR (fourier transform infrared spectra),1H-NMR (Proton nuclear magnetic resonance), DSC (Differential scanning calorimeter), POM (polarized light microscopy), TGA (thermogravimetric analysis) and WAXD (wide-angle X-ray diffraction). It was shown that with the anhydride/AGU ratio increasing, the degree of substitution (DS) value of E2C16showed a trend of up first and then down. With the carbon chain length increasing, the DS value of E2C16continuously increases. The phase transition temperature and thermal enthalpy of the copolymers increased with an increasing DS value of E2C16. When the ratio of CB/AGU was 1.5:1, the DS of E2C16was up to the maximum value of 1.02, and the corresponding melting enthalpy and crystallization enthalpy were 32 J/g and 30 J/g, respectively. The copolymers showed solid–solid phase change behavior. The heat resistant temperature of cellulose-based solid–solid phase change materials was always higher than 270 °C. After the grafting reaction, the crystallinity of E2C16decreased, while the crystal type was still hexagonal.Keywords:cellulose;fatty acid anhydride;polyoxyethylene (2) hexadecyl ether;solid–solid phase change
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
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Lei Chen,Ruiqi Zhang,Xing Cao,Xuebing Li,Yongtao Qu
High latent heat and thermostatic properties of phase change materials (PCMs) have made them the promising materials. Herein, a novel thermally-induced flexible 1-Hexadecanol/Olefin block copolymer/Hexagonal boron nitride (HD/OBC/h-BN) composite phase change material (CPCM) is proposed. Bio-based non-polluting material of HD is employed innovatively as the phase change component. The triggering of HD phase transition can achieve various deformation modes for CPCM, which is beneficial to reduce the thermal contact resistance between CPCM and device. The electrically insulating property of h-BN not only improves the thermal conductivity and the heating/cooling rate of CPCM, but also further solves the problem of the HD leakage (as low as 0.31 wt%). The prepared CPCM with excellent flexibility and high latent heat (above 150 J/g) has good thermal stability and thermal reliability in the working temperature range. This provides developed CPCM greater potential for thermal energy storage (TES) and thermal management (TM) than conventional PCMs.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 9
·1956-1964
·
IF 1.797
Zhou Meihui,Luo Yan,Du Juan
Higher coating rate and larger enthalpy value of phase change materials (PCMs) are the key content of temperature-regulated textile. The warming impact of traditional temperature-regulated textiles, namely no microencapsulated phase change materials (MPCMs) loading, is impermanent. In this paper, a high-efficiency heat storage and thermo-regulated MPCMs based on butyl stearate (BS)/hexadecanol (HD) binary system was synthesized successfully. It is found that the MPCMs take on spherical shape, as well as relatively uniform particle size. The mean particle size of MPCMs with smooth and compact surface is 1.755 um. Moreover, the phase change temperature of the MPCMs varied from 21.06 °C to 27.33 °C, and the latent heat of MPCMs was up to 73.78 J/g. A new type of intelligent textile material, namely temperature-regulated seaweed fibers were obtained by using wet spinning process adopting the resulted MPCMs. As a result, the MPCMs endows the seaweed fibers good temperature-regulated property.
研究领域:
纺织科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Yue Liu,Xukun Zhu,Ling Qin,Tong Zhang,Shuhan Wang,Yachao Jin,Li Song,Ming-Dao Zhang
The construction of special heterogeneous interface structures without precious metals is found to be efficient for the development of low-cost and high-activity hydrogen evolution reduction (HER) catalysts. Here, we report a moderate method to develop an efficient and stable HER electrode especially composed of the Co2(OH)2CO3 (COC) nanowire substrate modified by benzenehexol (HOB) molecules. This kind of interfacial structure leads to prominent electrocatalytic HER performance in an alkaline environment with a low overpotential of 130.8 mV at a current of 20 mA cm–2. Meanwhile, density functional theory (DFT) calculations reveal that the nanoscale synergistic interfacial mechanism and strong electron interaction between HOB and COC can reduce the activation energy for HER.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Kang Zhao,Jinhu Sheng,Shikai Ma,Junhao Yin,Nairui Luo,Junwei Ding,Heng Wang,Shiwen Wang,Shaoming Fang
For the development of electrolyte additives as an effective strategy to boost the reversibility of Zn anodes, most researchers focus on the functional groups but overlook the crucial molecular structure. Herein, ethylene glycol (EG), erythritol (Eryt) and hexanehexol (Hex) featuring with different molecular length and varied amounts of hydroxyl groups were introduced into 2 M ZnSO 4 electrolyte system as additives. Based on the theoretical computations and experimental analysis, the differences of three additives in tailoring the Zn anode/electrolyte interface were studied at the molecular level. Among these additives, EG additive with short molecular length and less hydroxyl groups delivers suitable interfacial adsorption energy and slightly stronger than that of water molecule, which could stabilize the anode/electrolyte interface most effectively. Therefore, with the EG additive in ZnSO 4 electrolyte, the undesired Zn dendrite growth and parasitic reactions including hydrogen evolution reaction, corrosion and passivation are significantly limited during the Zn plating/stripping process. As a result, employing EG as the electrolyte additive could greatly extend the cycling stability of Zn/Zn, Zn/Cu and Zn/V 2 O 5 batteries. This work proposes a new insight toward the optimal molecular configuration of additive design for electrolyte engineering in high-performance aqueous Zn batteries.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 67
·42129-42137
·
IF 3.108
Bozhen Wu,Liming Shi,Qi Zhang,Wen-Jun Wang
Herein, a novel approach for generating a microencapsulated reversible thermochromic phase change material (RTPCM) is described. The system described uses a spirolactone derivative color former, phenolic hydroxyl compound color developer, and 1-hexadecanol as the phase change material and co-solvent. The microencapsulation is achieved by complex coacervation of modified gelatin containing vinyl groups and gum arabic. This is followed by the crosslinking reaction between vinyl groups on modified gelatin and a divinyl crosslinker and subsequent crosslinking reaction with glutaraldehyde to improve stability and encapsulation efficiency. The influence of various key parameters on properties of the microcapsules (encapsulation efficiency, morphology, and particle size) are reviewed including the substitution degree of vinyl groups on modified gelatin, the type and amount of divinyl crosslinkers, and the core/shell ratio. Thermal properties and reversible color reliability of the generated microcapsules were found to be stable after 100 thermal heating and cooling cycles. Such microcapsules are well suited for latent heat storage and as an indicator for the states of energy saturation and consumption in phase change material applications directly through color change.
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
Reaction Kinetics Mechanisms and Catalysis
·
2022
·Vol. 135
·期 3
·1621-1634
·
IF 1.843
Gu Xiaoyu,Shi Haonan,Wang Dandan,Chen Jixiang
The carbon-coated Ni (Ni@C) and Ni–In intermetallic compounds (IMCs) (Ni–In@C) catalysts were synthesized via combining one-pot hydrothermal method with glucose as carbon source and the carbonization under N 2 atmosphere. Their reactivities were compared in in situ aqueous phase selective hydrogenation of methyl palmitate to hexadecanol using methanol as a H 2 donor. The Ni@C catalyst dominatingly catalyzes decarbonylation/decarboxylation, accompanying with the serious C–C bond hydrogenolysis and methanation. In contrast, hexadecanol is mainly generated on Ni–In@C, where C–C bond hydrogenolysis and methanation are remarkably inhibited. This is ascribed to the geometric and electronic property of Ni–In IMCs. The hexadecanol yield reaches 84.0% under an optimal condition on Ni–In@C. The structure of NiIn IMC is hydrothermally stable even at 330 °C, and the Ni–In IMCs particles highly resist to sintering and leaching under harsh hydrothermal condition due to the confinement of carbon. Catalyst deactivation is mainly due to the carbonaceous deposition, and the catalyst reactivity is mostly recovered by the regeneration with CO 2 .
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2017
·Vol. 5
·期 11
·2005-2014
·
IF 2.789
Yi Wang,Zhou Liu,Ting Zhang,Zhengfei Zhang
With the aim of improving the shape stability and recycling reliability of hexadecanol (HD), graphene oxide (GO)-grafted hexadecanol (GO- g -HD) shape-stabilized phase-change material (SSPCM) with good thermochemical properties was prepared by oxidizing graphite powders to form GO, which was converted into the acyl chloride and finally condensed with HD. Various characterization techniques were employed to investigate the microstructure, thermal properties, thermal durability, and reliability of the composite. The results show that HD was embedded in the composite with a maximum mass fraction of 62.7 wt % through physical adsorption and covalent bonding. The grafted percentage and density of HD on ultrathin GO sheets are 36.5 wt % and 1.51 mmol g −1 , respectively. The GO- g -HD SSPCM melts at 49.7 °C with a latent heat of 152.3 J g −1 , and freezes at 45.4 °C with a phase-change enthalpy of 129.9 J g −1 . The thermal conductivity of GO- g -HD is measured as 0.519 W m −1 K −1 , which is an improvement of 41.8 % compared with that of neat HD. Moreover, the as-prepared composite also presents excellent chemical and thermal stability, excellent thermal durability, negligible variation in latent heats, and no changes in the phase-change temperatures due to strong covalent bonds and interactions between the matrix and HD. Thus, GO- g -HD is a promising candidate for thermal energy storage in the future because of the very good latent heat, enhanced conductivity, and stability.
研究领域:
材料科学
·
热能工程
·
能量存储
✓ 已验证
产品关联
DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2018
·
IF 1.54
Na Han,Wenxin Zhang,Xiufang Wang,Xingxiang Zhang,Wei Li,Wanyong Yu
It is a worldwide challenge to efficiently use renewable resources to solve the current energy shortage. The existing cellulose-based material is incapable of proper power storage. In this study, a series of cellulose benzoate-g-polyoxyethylene (2) hexadecyl ether (CB-g-E2C16) solid–solid phase change materials were synthesized with cellulose as the skeleton and polyoxyethylene (2) hexadecyl ether (E2C16) as a functional side chain. The skeleton cellulose and benzoyl chloride restrict the free movement of the molecular chains of E2C16 above the phase transition temperature, leading to a solid–solid phase change. Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy were performed to investigate the chemical structures. The thermal energy-storage properties, thermal reliability and thermal stability of the CB-g-E2C16 were investigated by differential scanning calorimetry and thermogravimetry (TG) methods. The analysis results indicated that the E2C16 chains were successfully grafted onto the cellulose benzoate (CB) backbone and the copolymers exhibited typical solid–solid phase transition behavior. The enthalpy and degree of substitution of graft copolymers CB-g-E2C16 could be adjusted by changing the feeding ratio of the raw materials, reaction temperature and post-processing methods of CB. TG analysis results showed that the CB-g-E2C16 copolymers possessed good thermostability and they keep their stability up to 278℃. Compared with pure cellulose, CB-g-E2C16 copolymers could be dissolved in dimethyl sulfoxide and most of them could be dissolved in N,N-dimethylformamide.
研究领域:
材料科学
·
能源科学
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2024
·
IF 6.3
Tao Xu,Runhua He,Gan Fan,Dongqiao Zhang,Jiaming Zhang,Yanliang Du,Wei Zhou,Jing Yang
High temperature will generate when photovoltaic (PV) panel works, which probably reduces circle life and conversion efficiency during working. Typical phase change materials (paraffin, non-paraffin organics or salt hydrates) are restricted due to low thermal conductivity and incongruent melting and super-cooling. Herein, hexadecanol-palmitic acid/expanded graphite (HA-PA/EG) eutectic composite phase change materials with excellent thermal conductivity , leakage property, thermal stability and cycling stability were successfully prepared. The phase change temperature and latent heat of corresponding HA-PA/EG are 43.2 °C and 182.3 kJ/kg, respectively. HA-PA/EG possessed excellent thermal stability, and can meet the temperature requirement of photovoltaic panel during running. Furthermore, HA-PA/EG PCM had stable phase change temperature and latent heat even after 100 cycle heating. When applied in photovoltaic panel, HA-PA/EG could absorb large amount of heat from solar radiation and photovoltaic panel during strong solar radiation. When the solar radiation intensity was 815.9 W/m 2 , the temperature of HA-PA/EG-modified photovoltaic panel was 5.1 °C lower than that of control, and the temperature control by HA-PA/EG had excellent stability in different position. Thanks to the huge heat absorption by HA-PA/EG, the output voltage and power of photovoltaic panel could be considerably improved to 5.7 % and 7.4 % higher than that of control at the solar radiation intensity as 815.9 W/m 2 . Our result demonstrates that HA-PA/EG PCM is promising in the heat management of PV . Our study provides a novel eutectic PCM with suitable phase change temperature and excellent thermal conductivity to control the temperature and improve the corresponding voltage and power performance of PV panel.
研究领域:
材料科学
·
能源工程
·
光伏技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）