CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Zhongwei Wang,Shoulu Yang,Zhu Liu,Fangjun Ding,Ning Ji,Yiqiang Wu
A novel method for preparing a tung oil-based flame retardant polyol (MTTO) is described. An epoxidized tung oil methyl ester was initially prepared using green nontoxic phosphotungstate (Ag 3 O 40 PW 12 ·xH 2 O) as the catalyst. The MTTO was then produced from epoxidized transesterified tung oil (ETOME) using diethyl phosphate and ring-opening. The MTTO molecular structure was analyzed using FTIR, 1 H, 31 P, 13 C NMR, and HR-MS. Both MTTO and MTTO-coated melamine-modified bamboo showed excellent flame retardation, with a UL-94 rating of V-0, increased LOI from 28.3 % to 36.4 % and 38.7 %, and significant reductions in the PHRR and THR of the untreated bamboo of 42.7 % and 50.6 % and 37.5 % and 42.1 %, respectively. MTTO was effective in both the gas and condensed phases, preventing bamboo degradation through the release of non-flammable small molecules and the formation of a cross-linked phosphorus-oxygen network carbon layer. Moreover, the addition of melamine led to the release of more non-flammable gases, expansion of the char layer, and increased density of the nitrogen-phosphorus-oxygen cross-linked network carbon layer during combustion, resulting in reduced PHRR and THR.
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
BIORESOURCE TECHNOLOGY
·
2014
·
IF 5.039
Yong Gang Sun,Yulong Ma,Zheng Wang,Junkang Yao
A combinative pretreatment technology of steam explosion (SE) and alkali was applied to enhance hydrogenolysis conversion of corn stalk into polyol with Ni–W 2 C or Fe–Mn–K catalyst. The results showed that treatments corn stalk with 0.4 MPa SE and alkali removed 84.16 wt% of hemicellulose and 71.83 wt% of lignin and thereby increased the cellulose content from 31.54 to 80.41 wt%. But the glucose loss was insignificant during pretreatment. Data from catalytic hydrogenolysis showed that pretreatment corn stalk with 0.4 MPa SE and alkali improved the yield of polyol, and about 20.38 wt% of ethylene glycol and 52.36 wt% of glycerol were produced after catalysis with Ni–W 2 C/(coconut shell activated carbon, CSAC). Based on the yield of polyol, the catalytic performance of Ni–W 2 C/CSAC was significantly better than those of Ni–W 2 C/(coal-based activated carbon) and Fe-Mn-K/(amorphous carbon).
研究领域:
生物化学
·
可再生能源
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2016
·Vol. 16
·期 1
·480-488
·
IF 1.338
Kaili Zhang,Yongguo Du,Shimin Chen
This study reports the development of a facile and efficient one-pot polyol method for the synthesis of silver nanowires. The seed and growth of silver nanowires under different reaction conditions were characterized and measured. The pertinent variables such as temperature, time, concentration
and capping agent were investigated. Moreover, the effect of seeding at two different stages—initial stage and secondary stage–was studied and discussed on the size control of silver nanowires. In particular, silver nanowires with diameter less than 40 nm and length over 25 μm
in a narrow distribution, was obtained through a novel method in which reaction flask was placed in a lowtemperature bath after seeding for some time in the high-temperature bath. This approach may be useful for the fabrication of uniform, large aspect ratio silver nanowires for optoelectronic
applications.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Jiyan Wei,Xiaoquan Li,Fuping Bian,Jun Zeng,Jiwen Hu,Tongqiang Zong,Na Li,Shudong Lin
High purity silver nanowires (AgNWs) have received a lot of attention from researchers in the field of conductive materials. Conventional polyol synthesis method of AgNWs inevitably leads to the formation of byproduct such as silver nanoparticles. These silver nanoparticles weaken the performance of AgNWs-based flexible displays and must be cleaned up by the purification steps. In this article, we reported a facile and simple method for the synthesis of high purity AgNWs with aspect ratio over 1500 by a one-pot polyol method using silver chloride (AgCl) suspension as nucleating agents via a heterogeneous nucleation mechanism. The process of AgNWs formation was revealed by characterizing UV–vis absorption spectra at different reaction steps, then the process of AgNWs growth from nucleating agents was hypothesized. The reaction temperature and the amounts of AgCl suspension were discussed to investigate their effect on morphology of AgNWs. The high purity silver nanowires prepared via this way are ideal materials for flexible transparent conductive films and will be widely used in flexible displays, solar cells and sensors.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2016
·
IF 2.259
Lili Zhu,Gaiqing Zhao,Xiaobo Wang
In this study, three oil-soluble phosphonium-based ionic liquids (ILs) were synthesized and then investigated them as potential lubricating additives. The friction-reduction and antiwear performances of the ILs as lubricant additives in pentaerythritol oleate (PETO) and trimethylolpropane trioleate (TMPTO) were evaluated on an Optimol SRV-IV oscillating reciprocating friction and wear tester. The results indicated that tetradecyltrihexylphosphonium O,O′-diethyldithiophosphate (IL3=TTP−DDP) exhibited considerably better lubrication properties than commercially available tricresyl phosphate (TCP) by performing very well at 200 °C. SEM and XPS were performed to analyze the worn surfaces and revealed the fabrication of tribofilm composed of Fe(OH)O, Fe 3 O 4 , FePO 4 and FeSO 4 , which played a crucial role in the excellent lubricating behaviours of the ILs-additived lubricants.
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
Materials Research Express
·
2017
·Vol. 4
·期 7
·075052
·
IF 1.068
Bowen Lei,Jie Wang,Yongguo Du,Kaili Zhang
Silver nanowires (Ag NWs) of different aspect ratios have emerged as promising materials toward manufacturing optoelectronic devices for various applications. We report herein a facile, polyol-based one-pot strategy that has allowed us to synthesize Ag NWs ranging in length from 4–7 to 20–34 µm and diameter of 49 ± 10 nm, by simply controlling the concentration of MnCl2 and KBr. The kinetics of Ag+ converted to Ag0 have been thoroughly investigated, revealing that the introduction of MnCl2 and KBr plays a key role toward the growing of Ag NWs with a high aspect ratio. Cl− and Br− would significantly influence the reaction rate of Ag+ as well as the reaction activation energy, which controls the nucleation, seeding and growth process of Ag NWs. In addition, MnCl2 and KBr promote an efficient conversion of Ag+ and thus, productivity of Ag NWs up to 90% and 70%, respectively. Without further post-treatment, the conductive film made of this Ag NWs on glass had a sheet resistance of 24 Ω/sq and the specular transmittance of it were 92.4%, which proved it is highly potential for optoelectronic applications.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 30
·e52661
·
IF 3.057
Hongming Zhang,Guangping Han,Wanli Cheng,Shunjie Liu,Xianhong Wang
Amorphous structural CO 2 -polyol was used to modify ester-based water-borne polyurethanes (WPUs), resulting in improved low temperature film forming and comprehensive hydrolysis/oxidation resistance properties. Excellent intact films can be easily formed even at 3°C by adding 5% CO 2 -polyol into the ester-based WPUs (namely PU 5 CO 2 ). Moreover, WPUs modified by CO 2 -polyol show superior hydrolysis/oxidation resistance properties than that of control samples based on castor oil or poly(propylene oxide) glycol. PU 5 CO 2 showed significantly enhanced retention tensile strength from 40% to 68.2% than that of pure ester-based WPU after 5 h immersion in 1.5% NaOH solution, indicating an improved hydrolysis resistance. In addition, the PU 5 CO 2 displayed boosted oxidation resistance property with retention strength increased from 39% to 65%. Notably, the all-around aging resistance of ester-based WPUs intensified with an increase of CO 2 -polyol content. This work indicates that the CO 2 -polyol may be a promising modified material to improve comprehensive hydrolysis/oxidation resistance and low temperature film forming for ester-based WPUs.
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
Nanomaterials
·
2018
·Vol. 9
·期 1
·28
·
IF 3.504
Xianghong He,Yaheng Zhang,Yu Fu,Ning Lian,Zhongchun Li
There are only a few inorganic compounds that have evoked as much interest as sodium yttrium fluoride (NaYF4). Its extensive applications in various fields, including transparent displays, luminescence coding, data storage, as well as biological imaging, demand the precise tuning of the crystal phase. Controlling the emergence of the desired α-phase has so far remained a formidable challenge, especially via a simple procedure. Herein, we represented a polyol-assisted fluoride ions slow-release strategy for the rational control of pure cubic phase NaYF4mesocrystals. The combination of fluorine-containing ionic liquid as a fluoride source and the existence of a polyalcohol as the reactive medium ensure the formation of uniform α-phase mesocrystallines in spite of a higher temperature and/or higher doping level.Keywords:polyol-assisted fluoride ions slow-release strategy;NaYF4mesocrystals;crystallographic phase control
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIRE AND MATERIALS
·
2021
·Vol. 46
·期 1
·130-137
·
IF 2.407
Changchen Cai,Qian Sun,Kai Zhang,Xiaoyu Bai,Peng Liu,Aixiang Li,Zijian LYu,Qiuhong Li
Summary Propylene oxide (PO) was used to block polycarboxyethyl phenyl ethylene phosphinate (PCEPEP) synthesized by 2-carboxyethylphenylphosphinic acid (CEPPA) and ethylene glycol (EG) to obtain a reactive phosphonate polyol. The results of chemical titration analysis and Fourier transform infrared spectrum (FT-IR) showed that the end-capping effect was best when the molar ratio of PO to acidic functional groups in PCEPEP was 6:1. Moreover, the obtained phosphorus-containing polyol was used as a reactive monomer to be introduced into thermoplastic polyurethane (TPU) to prepare flame retardant TPU. Cone calorimetry results demonstrated that TPU containing 20 wt% phosphorus-containing polyol showed a reduction of 3.8%, 72.2%, and 39.3% in the peak heat release rate, total heat release and total smoke release, and an increment of 351.9% in mass retention. The addition of phosphonate polyol enhanced the char-forming performance of TPU, which effectively prevented the transfer of combustible gas and heat, and displayed a good flame retardant effect.
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
Scientific Reports
·
2015
·Vol. 5
·期 1
·1-7
·
IF 5.578
Chen Liang,Zhang Yu,Zhu Pengli,Zhou Fengrui,Zeng Wenjin,Lu Daoqiang Daniel,Sun Rong,Wong Chingping
Monodisperse Cu 2 O of different microstructures, such as cubes, flower-like and microspheres, have been extensively synthesized by a simple polyol reduction method using different copper salts, i.e. (Cu(acac) 2 , Cu(OH) 2 and Cu(Ac) 2 ·H 2 O). The effects of copper salts on the morphology of Cu 2 O were investigated in details through various characterization methods, including X-ray diffraction, transmission electron microscopy, scanning electron microscopy and UV-Vis absorption spectra. The effects of morphology on the electrochemical properties were further studied. Among the different structures, Cu 2 O with the microspheric morphology shows the highest specific capacitance and the best cycling stability compared with those of the other two structures, thus bear larger volume charge during the electrochemical reaction due to the microspheres of small nanoparticles.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Materials
·
2025
·Vol. 18
·期 10
·2315
·
IF 3.2
Songya Feng,Anxin Gao,Zihang Ma,Hongjie Xu,Zhiyong Xue
The general polyol methods used for synthesizing copper nanoparticles (CuNPs) usually require high temperatures to ignite the reduction reaction, which leads to the difficulty of controlling the particle size. Herein, a new polyol method for the size-controllable synthesis of CuNPs at low temperatures by adopting high-pressure hydrogen as the reductant is verified. It is proven that hydrogen is capable to reductively produce CuNPs at temperatures as low as 120 °C. The size of the CuNPs can be controlled between 19.29 nm and 140.46 nm by adjusting the hydrogen pressure, the reaction temperature, and duration. An empirical relationship between temperature and particle size is proposed. This work verifies a low-temperature strategy to synthesize nanoparticles with good size-controllability.
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ChemSusChem
·
2019
·Vol. 13
·期 5
·964-973
·
IF 7.804
Ronghui Que,Maolin Li,Hong Yao,Xiuhua Wang,Fan Liao,Mingwang Shao
Graphical Just add water : A mere trace of water roughly halves the size and regulates the composition of polyhedral Ni x Co 1− x alloy nanoparticles prepared by the polyol method. The Ni 0.6 Co 0.4 nanoparticle alloy obtained by adding 70 μL of water shows superior electrocatalytic performance in the methanol oxidation reaction owing to its appropriate Ni/Co ratio and is a promising electrocatalyst for use in direct methanol fuel cells. Highly active Ni-based catalysts have attracted much attention but are still facing challenges owing to the immature synthetic method. Herein, polyhedral Ni x Co 1− x alloy was prepared by a facile modified polyol method in which a trace amount of water could halve the particle size of the alloy. The Ni/Co ratios in Ni x Co 1− x alloy strictly depended on the used amount of water owing to the different solubilities of the precursors. Among them, the Ni 0.6 Co 0.4 nanoparticles obtained with 70 μL of deionized water exhibited the best performance in the methanol oxidation reaction with a peak current density of 116 mA cm −2 in the presence of 1 m NaOH+0.5 m CH 3 OH solution, which is higher than those of Ni 0.7 Co 0.3 (80 mA cm −2 ) and Ni 0.5 Co 0.5 (33 mA cm −2 ). The excellent performance of Ni 0.6 Co 0.4 is attributed to the unique structure with appropriate Ni/Co ratio, which elongates the C−O bond in methanol and lowers the reaction free energy according to DFT calculations.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）