JOURNAL OF POLYMER RESEARCH
·
2023
·Vol. 30
·期 8
·1-11
·
IF 2.8
Chen Fanfan,Xiao Yao,Yan Sitong,Fang Lin,Wang Zhifen,Liao Jianhe
Modifying natural rubber latex (NRL) and blending it with NRL can improve NRL performance and expand application fields. The performance of co-blended latex will change due to changes in non-rubber components during storage. Therefore, it is important to study the change of properties during the storage of co-blended latexes. In this paper, 30% methyl methacrylate grafted natural rubber (MG30) was synthesized by cumene hydroperoxide/ tetraethylenepentamine (CHPO/TEPA) initiating system, MG30 and NRL were mixed in different proportions to study the morphology and physical and mechanical properties, and the colloidal properties and emulsion properties of co-blended latexes were studied during storage. The results showed that the mechanical stability of NRL and co-blended latexes were high and the viscosity gradually increased during storage. The study of the vulcanization characteristics of the co-blended latexes films and the physical and mechanical properties of the vulcanized latex films showed that the vulcanization time of the co-blended films increased and the torque value increased in comparison to NRL. With the increase of MG30 content, the tensile strength and tear strength of the co-blended latexes vulcanized films showed a trend of increasing and then decreasing, and the co-blended film with 10% MG30 showed the best mechanical properties.
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
Small Methods
·
2018
·Vol. 3
·期 4
·1800111
·
IF 0
Yuruo Qi,Junmei Zhao,Chao Yang,Huizhou Liu,Yong-Sheng Hu
Sodium vanadium fluorophosphate, Na 3 (VO 1− x PO 4 ) 2 F 1+2 x (0 ≤ x ≤ 1), is proved to be a series of very promising cathode materials for Na-ion batteries, owing to the high operating voltage and structural stability. However, the selective preparation of phase-pure Na 3 (VO 1− x PO 4 ) 2 F 1+2 x (0 ≤ x ≤ 1) with outstanding electrochemical performance still remains a big challenge. Moreover, there are lots of discrepancies concerning the Na-storage properties, including a diversity of voltage profiles and capacities reported, based on the variety of synthetic methods. Herein, a comprehensive investigation is conducted about the fabrication of phase-pure Na 3 (VO 1− x PO 4 ) 2 F 1+2 x (0 ≤ x ≤ 1) by employing different starting materials and corresponding synthetic conditions, based on a facile low-temperature hydrothermal strategy. Results show that the pH in the reaction system may be of vital importance for the successful preparation of Na 3 (VO 1− x PO 4 ) 2 F 1+2 x (0 ≤ x ≤ 1) with special microarchitecture. Furthermore, it is found that NaH 2 PO 4 ·2H 2 O is the most appropriate phosphorus source, while VCl 3 , VOSO 4 · x H 2 O, and NH 4 VO 3 are the best choices of vanadium sources to prepare Na 3 (VO 1− x PO 4 ) 2 F 1+2 x (0 ≤ x ≤ 1) with superior Na-storage performance. This is the first time that the underlying correlations between the starting materials and the Na-storage performance, are investigated and further that guidance for the selective synthesis of phase-pure Na 3 (VO 1− x PO 4 ) 2 F 1+2 x (0 ≤ x ≤ 1) with superior performance is provided.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Yuxiao Jia,Xuancheng Wang,Leijie Hu,Xuezhang Xiao,Shuoqing Zhang,Jiahuan He,Jiacheng Qi,Ling Lv,Fen Xu,Lixian Sun,Lixin Chen
Ultrafine carbon-based transition metal compounds have been widely investigated as efficient catalysts for enhancing the hydrogen storage performance of magnesium hydride. In this work, the carbon thermal shock method is applied to synthesize the ultrafine carbon-encapsulated NbC nanoparticles with an average grain size of 17.3 nm. The MgH 2 –10 wt% NbC/C composites show excellent low-temperature hydrogen storage performance with the onset dehydrogenation temperature of 196.1 °C, which is 92.2 °C and 98 °C lower than that of MgH 2 –10 wt% NbC and undoped MgH 2 , respectively. Specifically, MgH 2 –10 wt% NbC/C can absorb 6.71 wt% H 2 at 100 °C within 30 min around and retain almost 100% reversible hydrogen desorption capacity after 10 cycles. For the catalytic mechanism, the electron transfer process between multi-valence Nb cations of in-situ formed NbH x and Mg, H atoms can greatly improve the cyclic de/rehydrogenation kinetics of MgH 2 -NbC/C. Besides, the enhancement of dehydrogenation kinetics can also be ascribed to MgH 2 particle refinement by NbC nanoparticles, and destabilization of the Mg-H bond caused by carbon substrate. This investigation not only proves that carbon-encapsulated NbC nanoparticles can greatly enhance the hydrogen storage performance of MgH 2 but provides an idea of preparing carbon-based transition metal carbides as effective catalysts for magnesium-based hydrogen storage materials.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
JOURNAL OF CEREAL SCIENCE
·
2023
·
IF 3.8
Baihui Wang,Jingjing Luo,Qingling Zhang,Xing Cao,Yanjuan Zhang,Zuqiang Huang,Huayu Hu,Tao Gan
Brown rice is susceptible to oxidation of lipids during storage, resulting in the deterioration of cooking quality and the loss of nutrients. The negative oxygen ions (NAIs) have the functions of high permeability, antioxidation, and sterilization, but the application of NAIs for the storage of brown rice is less. In this study, brown rice is stored in a high temperature and humidity (temperature of 42 °C, humidity of 75%) NAIs environment, and its storage and physicochemical properties are investigated. After 12 d of storage in the NAIs environment (NAIs concentration of 2 × 10 4 ions/cm 3 ), the fatty acid value, catalase activity, and viability of brown rice are 10.51 mg KOH/100 g, 0.94 U/mg, and 72%, respectively, which are better than that in high temperature and humidity air environment, showing good storage performance. The internal structure, crystalline shape, and relative crystallinity of brown rice are insignificant broken, and the steaming quality does not change significantly with the extension of storage time. The results show that the NAIs environment has potential to extend the storage time and maintain the eating quality and nutrition of brown rice in storage, which can be used as a green and low-cost storage strategy for crops.
研究领域:
食品科学
·
储藏技术
✓ 已验证
产品关联
DOI
高影响因子
Advances in Materials Science and Engineering
·
2022
·Vol. 2022
·期 1
·3109178
·
IF 2.098
Yuxian Wang,Jing Gu,Xian Li,Yan Zhu,Hongyun Hu,Huan Liu,Guangqian Luo,Hong Yao
Cellulose-originated three-dimensional graphene oxide CNT-modified LiOH·H 2 O (3D-GO-CNTs-LiOH·H 2 O) was synthesized by the hydrothermal method. LiOH·H 2 O nanoparticles (5–50 nm) were homogeneously dispersed inside the 3D-GO-CNTs frames. The composite showed enhanced heat storage density, excellent thermal conductivity, and greatly improved hydration rate due to both the hydrophilic reaction interface of 3D-GO-CNTs frames and reduced size of LiOH·H 2 O nanoparticles. LiOH·H 2 O content ratio of 23% (3D-GO-CNTs-LiOH·H 2 O-1) results in best heat storage performance with activation energy of 23.8 kJ/mol, thermal conductivity of 3.06 W/m·K, and heat storage capacity of 2800 kJ/kg. 3D-GO-CNTs-LiOH·H 2 O shows 4.2 folders heat storage capacity than that of pristine LiOH·H 2 O after the same hydration reaction. Other composite materials also show good performance: 3D-GO-CNTs-LiOH·H 2 O-2 (activation energy: 28.5 kJ/mol, thermal conductivity: 2.33 W/m·K, and heat storage capacity: 2051 kJ/kg.); 3D-GO-CNTs-LiOH·H 2 O-3 (activation energy: 32.3 kJ/mol, thermal conductivity: 2.01 W/m·K, and heat storage capacity: 1983 kJ/kg.). The addition of cellulose originated 3D-GO-CNTs was proved to be an excellent strategy to boost the heat storage performance of LiOH·H 2 O.
研究领域:
材料科学
·
化学工程
·
能源存储
✓ 已验证
DOI
高影响因子
HEAT AND MASS TRANSFER
·
2020
·Vol. 56
·期 9
·2769-2777
·
IF 1.867
Zhang Shihua,Zhang Xuelai,Xu Xiaofeng,Zhao Yi
The effect of nanomaterials on the thermal behavior of Decanoic-Caprylic Acid (DA-CA) binary eutectic mixture was investigated experimentally. Different high thermal conductivity nanomaterials, including nano-sized iron oxide (Fe 2 O 3 ), nano-sized copper (Cu), hydroxylated multi-walled carbon nanotubes (MWCNT-OH), and dispersant Span-60, were added into DA-CA, respectively. The nanomaterial-enhanced phase change materials (NePCMs) were prepared by the ultrasonic oscillation method. The effects of nanomaterials on the cool storage performance of DA-CA were studied from the types and concentrations of nanomaterials. The experimental results showed that as the nanomaterials mass concentration increased, the thermal conductivity increased first and then gradually stabilized. The thermal conductivity trend for the composites added to the nanomaterials was: 0.40 g·L −1 Fe 2 O 3 > 0.10 g·L −1 MWCNT-OH > 0.30 g·L −1 Cu. DA-CA + 0.40 g·L −1 Fe 2 O 3 exhibited the best thermal properties, and its thermal conductivity increased by 36.8%, and the thermal storage time decreased by 38%. After 500 times thermal stability test, the NePCMs still maintained the appropriate phase change temperature and high latent heat. Therefore, this material has potential as part of the cold chain logistics for fruit and vegetable preservation.
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
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Xiaonan Huo,Wei Li,Yu Wang,Na Han,Jianping Wang,Ning Wang,Xingxiang Zhang
In order to reduce environmental pollution during microencapsulating phase change materials and expand their applications as well, a novel eco-friendly microencapsulated/nanoencapsulated phase change materials (Micro/NanoPCMs) and the corresponding encapsulation method were proposed and discussed in this study, where the natural chitosan and side-chain crystallizable comb-like polymer were selected as shell material and core material, respectively. During the encapsulating process via coacervation, the effects of different core-shell ratios on the morphology and thermal storage properties of microcapsules were discussed. FE-SEM and TEM was employed to investigate the morphology and microstructure of the microcapsules. The thermodynamics performance of microcapsules was studied using TGA and DSC. The encapsulation efficiency of microcapsules ranged from 49.82% to 68.99%, and the thermal stability temperature of microcapsules was measured to be 243.2 °C. The fabrication process where natural raw materials were employed and showing promising applications in such fields as medical treatment.
研究领域:
材料科学
·
环境科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Ruizhi Zheng,Renjie Chen,Delong Xie,Xinjie Luo,Yu Wang,Yang Bai,Sihao Yin,Jian Xiang,Hongfei Zhang,Yi Mei
Phosphorus-modified hexadecanol is regarded as a promising heat storage medium for form-stable phase-change materials (FSPCMs) because of its high energy storage density and good thermal stability . In this study, a novel FSPCM was fabricated using phosphorus-modified hexadecanol, 1-oxo-4-hydroxymethyl-2,6,7-trioxa-l-phosphabicyclo [2.2.2] octane (PEPA), and pentaerythritol (PER). Among all the samples, FSPCM (P3), containing 9 % PEPA and 3 % PER, exhibited the optimal thermal storage performance and flame-retardant properties. Its latent heat was 122.5 J/g, and its photo-to-heat conversion efficiency was 61.8 %. The limiting oxygen index of P3 approached 29.5 %, and the UL-94 V -0 rating was attained. The decomposition and fire-retardant mechanism were inferred based on the analysis of char residues and the gaseous phase to determine the interaction between the PCMs and flame retardants.
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
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2024
·
IF 4.3
Jianxun Zhao,Wenhao Fan,Wanqiang Liu,Lianshan Sun,Yuhai Wang,Heng Liu,Peng Chen,Qingcheng Liang,Yong Cheng,Xinwei Wang
The Co 0.9 Cu 0.1 Si alloy was prepared using the mechanical alloying method, while CeO 2 and Ni-CeO 2 were synthesized through the hydrothermal method. Various mass ratios of CeO 2 and Ni-CeO 2 were incorporated into the Co 0.9 Cu 0.1 Si alloy via the mechanical alloying process. The electrochemical test results demonstrated a significant enhancement in hydrogen storage performance compared to that of the original Co 0.9 Cu 0.1 Si alloy. In our experiment, the samples with identical doping ratios revealed that the composite material doped with Ni-CeO 2 exhibited superior electrochemical hydrogen storage performance compared to its counterpart solely doped with CeO 2 .When Ni-CeO 2 was doped in the composite material at a ratio of 20:1, the sample demonstrated exceptional electrochemical hydrogen storage performance. At a discharge current of 25 mA/g, the discharge capacity reached 606.7 mAh/g, and after 50 cycles, the capacity retention rate was measured at 63.4%. Furthermore, its corrosion resistance and exchange current density surpassed those of other samples. The multifarious origins underlying these outcomes are rooted in a multitude of factors. Primarily, nickel engenders this phenomenon through its provision of high specific capacitance, exceptional reversibility, and enhanced electrical conductivity. Additionally, the introduction of nickel into the CeO 2 lattice creates vacancies that enhance hydrogen adsorption and facilitate charge transfer processes. Furthermore, CeO 2 and Ni-CeO 2 form the protective layer for the alloy, preventing dissolution of its constituents on the surface while improving resistance against fragmentation and corrosion. The findings of this investigation support the idea that incorporating transition metal oxides doped with metallic impurities into hydrogen storage alloys can improve their electrochemical performance and kinetic attributes, while also strengthening their resistance to corrosive influences.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2014
·
IF 2.93
Wei Yuan Pan,Bin Hong Liu,Zhou Peng Li
In this study, we synthesized ZrO 2 nanorods through a hydrothermal process as a catalyst precursor for the reversible hydrogen storage reaction between 2LiH + MgB 2 and 2LiBH 4 + MgH 2. The 2LiH + MgB 2 composites doped with the ZrO 2 nanorods demonstrated superior and stable hydriding/dehydriding kinetics upon cycling. The XRD , SEM and HRTEM results revealed that the doped ZrO 2 nanorods were transformed into ZrB 2 nanoparticles with a size of a few nanometers during the first hydrogenation. The initial nanosize of the ZrO 2 catalyst precursor accounted for the formation of extremely fine ZrB 2 nanoparticles , which acted as heterogeneous nuclei of MgB 2 . The present study provides a new route for performance enhancement of complex hydride composites through manipulating the nanostructure of catalysts.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
Journal of Rubber Research
·
2022
·Vol. 24
·期 4
·555-562
·
IF 1.208
Chen Xu,Zhang Hui-Feng,Zhang Lu,Wei Yan-Chan,Hu Benxiang,Luo Ming-Chao,Liao Shuangquan
The changes in the structure, such as molecular weight, crosslinking density, and gel content, could influence the stability and the processing performance of natural rubber (NR) during storage. Previous works showed that temperature and humidity influence storage performances. Here, we found different coagulation methods could also affect storage behaviors of natural rubber, since coagulation methods could affect the content of non-rubber components. In this article, natural rubber latex was coagulated by three different coagulation methods. Under storage conditions, the content of some non-rubber components, namely the gel content, Mooney viscosity, Wallace initial plasticity ( \(P_{0}\) ), plasticity retention index (PRI), molecular weight, tensile strength, and crosslinking density of natural rubber were compared and analyzed. The results showed that properties (PRI, Mooney viscosity, and green strength) of NR were higher than that of NR-Salt and NR-Acid after storage; at the same time, PRI, Mooney viscosity, and green strength of NR-Salt were higher than that of NR-Acid after storage. Mooney viscosity and green strength of NR-Salt and NR-Acid showed a tendency for increase in the begin and then decrease. According to the changes before and after storage, we can choose suitable coagulation methods and rubber based on what we need.
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2018
·
IF 4.229
Meijia Liu,Xuezhang Xiao,Shuchun Zhao,Sina Saremi-Yarahmadi,Man Chen,Jiaguang Zheng,Shouquan Li,Lixin Chen
Transition-metal nanoparticles (NPs) can catalytically improve the hydrogen desorption/absorption kinetics of MgH 2 , yet this catalysis could be enhanced further by supporting NPs on carbon-based matrix materials . In this work, Co NPs with a uniform size of 10 nm loaded on carbon nanotubes (Co@CNTs) were synthesized in situ by carbonizing zeolitic imidazolate framework-67 (ZIF-67). The novel Co@CNTs nanocatalyst was subsequently doped into MgH 2 to remarkably improve its hydrogen storage properties. The MgH 2 -Co@CNTs starts to obviously release hydrogen at 267.8 °C, displaying complete release of hydrogen at the capacity of 6.89 wt% at 300 °C within 15 min. For absorption, the MgH 2 -Co@CNTs uptakes 6.15 wt% H 2 at 250 °C within 2 min. Moreover, both improved hydrogen capacity and enhanced reaction kinetics of MgH 2 -Co@CNTs can be well preserved during the 10 cycles, which confirms the excellent cycling hydrogen storage performances. Based on XRD , TEM and EDS results, the catalytic mechanism of MgH 2 -Co@CNTs can be ascribed to the synergetic effects of reversible phase transformation of Mg 2 Co to Mg 2 CoH 5 , and physical transformation of CNTs to carbon pieces. It is demonstrated that phase transformation of Mg 2 Co/Mg 2 CoH 5 can act as “hydrogen gateway” to catalytically accelerate the de/rehydrogenation kinetics of MgH 2 . Meanwhile, the carbon pieces coated on the surfaces of MgH 2 particles not only offer diffusion channels for hydrogen atoms but also prevent aggregation of MgH 2 NPs, resulting in the fast reaction rate and excellent cycling hydrogen storage properties of MgH 2 -Co@CNTs system.
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
危险品化学品经营许可证（带存储）