Polymers
·
2020
·Vol. 12
·期 1
·107
·
IF 3.426
Qinqin Zhang,Xiaoqi Lin,Weisheng Chen,Heng Zhang,Dezhi Han
Many achievements have been made on the research of composite polyurethane foams to improve their structure and mechanical properties, and the composite foams have been widely utilized in building insulation and furniture. In this work, rigid polyurethane foams (RPUFs) with the addition of different fillers (nano-SiO2, peanut shell, pine bark) were prepared through the one-step method. The effects of inorganic nano-SiO2and organic biomass on foam properties were evaluated by means of physical and chemical characterization. The characterization results indicate that the compressive strength values of prepared foams could fully meet the specification requirement for the building insulation materials. The inorganic and organic fillers have no effect on the hydrogen bonding states in composite RPUFs. Furthermore, compared to the biomass fillers, the addition of nano-SiO2greatly influenced the final residual content of the fabricated foam. All composite foams exhibit closed-cell structure with smaller cell size in comparison with the parent foam. The prepared composite foams have the potential for utilization in building insulation.Keywords:rigid polyurethane foam;peanut shell;pine bark;nano-SiO2;insulation materials
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Yun Li,Houfang Lu,Yingying Liu,Kejing Wu,Yingming Zhu,Bin Liang
Nano-SiO 2 was used to enhance the performance of CO 2 absorption and desorption in viscous DBU-glycerol solution with a viscosity of about 60 mPa·s. The effects of ultrasonic time in the preparation of nanofluids, solids loading and particle/cluster size of SiO 2 on absorbent properties and absorption performance were investigated. Meanwhile, the enhancements of heat transfer and mass transfer with nanoparticles in the desorption of CO 2 -loaded DBU-glycerol solutions were also analyzed. Proper ultrasonic vibration time and nano-SiO 2 loading can both decrease the average particle size in the system which can improve the absorption. The increase of interfacial area between gas and liquid with the addition of nano-SiO 2 dominates the enhancement of absorption and it has little effect on the enhancement factor when the nano-SiO 2 size is 102 nm or below. But when the particle size is higher than 102 nm, the enhancement factor decreases with the increase of particle/cluster size. The addition of 0.10 wt% SiO 2 nanoparticle with a particle size of 16 nm can increase the absorption rate by 31 % compared with base liquid. In desorption process, the desorption rate for CO 2 -loaded DBU-glycerol solutions can increase 18 % with the addition of 0.10 wt% nano-SiO 2 with a particle size of 32 nm. The main reason could be that nano-SiO 2 can improve the heating rate of the base fluid and supply plenty of nucleation sites for the formation of bubbles to improve the desorption rate. It shows that nano-SiO 2 can be used to enhance both the absorption and desorption processes in solutions with high viscosity.
研究领域:
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Yangxian Ou,Tao Zhang,Li Lv,Wenxiang Tang,Shengwei Tang
CO 2 hydrogenation is one of the reactions to realize effective utilization of CO 2 , while Cu-Zn based catalyst is widely adopted for CO 2 hydrogenation to value-added chemicals like methanol. However, this process is less efficient since the poor performance of catalyst due to its poor dispersion or sintering issue. In this study, three kinds of SiO 2 supports (SBA-15, MCM-41 and Nano-SiO 2 ) with different porous structure were conducted to load same amount of 5.0 wt% Cu-ZnO active component (the molar ratio of Cu/Zn is 2.0), which were further applied for CO 2 hydrogenation. All catalysts were characterized chemically, morphologically and structurally by different techniques such as XRD , BET, TEM , H 2 -TPR and CO 2 -TPD. The results showed that the structure of three catalysts was basically preserved and the surface aera kept stable after loading active component, while the active component had the best dispersion when SBA-15 was used as the support and space-time yield of methanol is about 705.6 g MeOH •kg Cu −1 •h −1 ,which is higher than that of Nano-SiO 2 -5% (532.9 g MeOH •kg Cu −1 •h −1 ) and MCM-41–5% (213.2 g MeOH •kg Cu −1 •h −1 ). Due to the confined effect of mesoporous channel structure provided by SBA-15 support, the Cu-Zn interaction could be significantly enhanced with increasement of medium and strong alkaline sites, further improving CO 2 activation ability. This work provides a useful strategy to improve the catalytic efficiency of classical Cu-Zn catalyst for the CO 2 hydrogenation process.
研究领域:
催化化学
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材料科学
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环境科学
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产品关联
DOI
高影响因子
CORROSION REVIEWS
·
2020
·Vol. 38
·期 4
·331-338
·
IF 1.912
Weibin Jiang,Quanliang Niu,Lin Cheng,Tao Zhou,Huasheng Xie
The damage caused by marine fouling organisms to ships and underwater artificial equipment is becoming increasingly serious issue, and the prevention and control of marine biofouling has always been a research hotspot in marine coatings. Aiming at the problems of poor adhesion, long curing time and high curing temperature of low-surface energy marine antifouling coatings of organosilicon, a hydrophobic low-surface energy nano-SiO 2 /silicon acrylic resin nanocomposite coating was synthesized. The anticorrosive property of the composite coatings was analyzed by simulated seawater periodic immersion experiments. The gel permeation chromatography analysis showed that polydimethyl-siloxanes (PDMS) is involved in cross-linking reactions. The dynamic thermomechanical analysis indicated that the glass transition temperature of resin is 58 °C. The contact angle (CA) test showed that the CA of nanocomposite coating is 109.99°. All the detection results can support the excellent antifouling and anticorrosion performance of the low surface energy nanocomposite coatings.
研究领域:
材料科学
·
海洋生物学
✓ 已验证
DOI
高影响因子
RUSSIAN JOURNAL OF APPLIED CHEMISTRY
·
2015
·Vol. 88
·期 7
·1207-1218
·
IF 0.276
Yue Chuan-Jun,Gu Li-Ping,Zhuang Ya-Feng,Liu Bao-Liang
A new strategy was introduced for the catalytic resolution of 1,2-propanediol involving the successive oxidative kinetic resolution and asymmetric hydrogenation by two hydrogen transfer reactions catalyzed by nano SiO 2 -bonded Ru-TsDPEN [TsDPEN = N -( p -toluenesulfonyl)-1,2-diphenylethylene diamine]-derived catalysts composed of two opposite configurations. The catalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET), Fourier-transform infrared spectroscopy (FT-IR), thermogravimetry-derivative thermogravimetry (TG-DTG) analysis, and inductively coupled plasma atomic emission spectrometry (ICP-AES). Results showed that Ru-TsDPEN derived catalysts were successfully grafted on the nano SiO 2 , affording high catalytic conversions of >99 and 99%, selectivities of 47 and 98% and maximum ee values of >99 and >99% in the two reactions, which were due to the nano SiO 2 with Ru-TsDPEN in the reaction system with high dispersion. Additionally, the catalysts exhibited excellent durability and were filtered and reused at least five times without noticeable catalysts deactivations.
研究领域:
化学工程
·
催化材料科学
✓ 已验证
DOI
高影响因子
Small
·
2024
·
IF 13
Yuting Xiao,Geng Chen,Bin Shi,Qing Chang,Limin Zhang,Hongjing Wu
The direct application of liquid marbles in electromagnetic wave (EMW) absorption is challenging due to their poor stability, susceptibility to gravitational collapse, and shaping difficulties. To address this issue, a novel strategy is proposed to incorporate liquid marble microstructures (NaCl/nano-SiO 2 ) encapsulated in organic phases (Octadecane) into the rubber-matrix (SEBS) using the ultrasound-assisted emulsion blending method. The resulting NaCl/SiO 2 /Octadecane microstructures anchored to SEBS offer a substantial solid–liquid interface consisting of NaCl solution and SiO 2 . When subjected to an alternating electromagnetic (EM) field, the water molecules and polysorbate within SiO 2 exhibit heightened responsiveness to the EM field, and the movement of Na + and Cl − within these microstructures leads to their accumulation at the solid–liquid interface, creating an asymmetric ion distribution. This phenomenon facilitates enhanced interfacial polarization, thereby contributing to the material's EMW absorption properties. Notably, the latex with 16 wt% SEBS (E-3), exhibiting a surface morphology similar to human cell tissues, achieves complete absorption of X-band ( f E = 4.20 GHz, RL min = −33.87 dB). Moreover, the latex demonstrates light density (0.78 g cm −3 ) and environmental stability. This study not only highlights the predominant loss mechanism in rubber-based wave-absorbing materials but also provides valuable insights into the design of multifunctional wave-absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2018
·Vol. 58
·期 12
·2143-2148
·
IF 1.551
Juan Chen,Wenbo Zhang,Heyi Ge,Juanjuan Tan,Jianye Liu
The hybrids of graphene oxide (GO) encapsulated nano-SiO 2 (SiO 2 -GO) were introduced into phenolic resin (PR) to enhance thermal stability of PR. The effect mechanism was investigated in detail. Through electrostatic self-assembly method, the SiO 2 nanoparticles were evenly distributed onto the surface of GO. This structure could not only prevent the aggregation of nano-SiO 2 , but also alleviate the phenomenons of crimp and stack for GO sheets in PR. Nano-SiO 2 and GO showed elaborate synergistic effect on thermal stability of PR. Compared with the pristine PR, the 2 wt% SiO 2 -GO/PR composite showed higher T 5% , T 10% , and T dmax , which were increased by 65.39, 62.23, and 23.17°C, respectively. And the char yield at 800°C increased from 64.78% to 69.38%. Thus, SiO 2 -GO hybrids can facilitate the application of PR in the fields of heat insulation and ablation resistance. POLYM. ENG. SCI., 58:2143–2148, 2018. © 2018 Society of Plastics Engineers
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 132
·期 2
·
IF 1.64
Zhenjiang Yu,Xuyang Liu,Fangbo Zhao,Xiaoyang Liang,Yu Tian
A novel low-cost SiO 2 /Polyvinylchloride (PVC) membrane with different nano-SiO 2 particles loading (0–4 wt %) was prepared by the phase-inversion process. The optimum nano-SiO 2 dosage was determined as 1.5 wt % based on the casting solution compositions, the membranes' mechanical properties and hydrophilicities, the pure water fluxes, microstructures, and absorption of protein. Compared with the bare membrane, the membrane with 1.5 wt % nano-SiO 2 addition presented better capabilities against the protein absorption and bacterial attachment, better antifouling performance, and higher flux recovery ratio in filtration of the supernatant liquor which collected from a secondary sedimentation tank in a municipal wastewater plant. The SiO 2 /PVC membranes have applicable potential in the municipal wastewater treatment for their low price, good antifouling performance and high removal efficiencies of SS (over 97.2%), COD (up to 82.9%) and total bacteria (more than 93.6%). © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41267.
研究领域:
环境科学
·
材料科学
·
水处理工程
✓ 已验证
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Fan Hu,Feng Qi,Zehui Xiang,Biao Zhang,Fugang Qi,Nie Zhao,Xiaoping Ouyang
A nano-polymer (IL@SiO 2 ) was synthesized by double bond polymerization and creatively applied to polyurethane elastomer (PUE-IL@SiO 2 ). The mechanical properties and energy absorption of PUE-IL@SiO 2 at static compression and dynamic impact were studied, respectively. The results show that: compared with pure PUE, the static compressive properties and dynamic impact resistance of PUE with a loading of IL@SiO 2 of 2wt% are the best, and the static and dynamic compressive yield strength are improved by 216.15% and 190.68% compared with PUE respectively. Moreover, the energy absorption of PUE-2%IL@SiO 2 is improved by 18.87% compared with PUE. The composite materials (PUE-2%IL@SiO 2 ) also has excellent deformation recovery performance. These outstanding mechanical properties illustrate the IL@SiO 2 is excellent impact resistance and reinforcing materials for PUE.
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
MACROMOLECULAR CHEMISTRY AND PHYSICS
·
2023
·Vol. 224
·期 11
·2300002
·
IF 2.5
Chen Dong,Jing Gao,Yunting Zhao,TianTian Ma,Yongjun He
The recovery of indium from impregnating resins in water is usually limited by the poor bonding of the extractant to the carrier resin. Pickering emulsion hydrogels (PEHGs) encapsulating extractant bis(2-ethylhexyl) phosphate are prepared by oil-in-water Pickering emulsions polymerization method using polyvinyl alcohol and sodium alginate as continuous phases and nano-SiO 2 and alkylphenol ethoxylates-10 (OP-10) as emulsifiers. PEHGs are used to recover trivalent In(III) from water to study its encapsulation and adsorption properties. Pickering emulsions are characterized by optical microscopy. PEHGs are characterized by Fourier transform infrared spectrometer and scanning electron microscopy. The results showed that the stabilization time of Pickering emulsions improved from 3 min to ≈14 days after the addition of 5 wt.% of OP-10. The internal structure of 4 -Pickering emulsion hydrogels ( 4 -PEHGs) prepared from Pickering emulsions co-stabilized by nano-SiO 2 and OP-10 is changed from core-shell to honeycomb structure and no oil phase leakage occurred. In(III) adsorption is carried out on 4 -PEHGs. The results showed that the maximum adsorption of In(III) in water by 4 -PEHGs is 18.03 mg g −1 . The adsorption process of In(III) is controlled by chemisorption. This study showed that 4 -PEHGs can be used as an effective adsorbent for the recovery of indium in water.
研究领域:
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Sustainable Cement-Based Materials
·
2017
·
IF 0
Xiuzhi Zhang,Xiaoha Du,Xiaoyan Zhao,Rui Zhang,Pengkun Hou,Zonghui Zhou,Xin Cheng
To understand the synergistic effect of nano-SiO2(NS) and silica fume (SF) on cement-based material, the hydration process, the compressive strength development, and the pore structure of cement-based materials with the addition of nano-SiO2 and SF were investigated. The results showed that the compressive strength of cement paste increased with the increase of NS, especially at the early ages. Compared with 10% SF, the incorporation of 3% NS in the cement pastes with 7%wt dosage of SF has the highest compressive strength (51.93 MPa). When replace SF with 3% NS, the hydration of cement was promoted, C–S–H gel increased as more calcium hydroxide was consumed. Three percent NS and 7% SF can significantly reduce the porosity of the cement matrix, which is also an explanation of the phenomenon of increased compressive strength.
研究领域:
土木工程
·
材料科学
✓ 已验证
DOI
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 139
·期 12
·51810
·
IF 3.125
Songling Chen,Yanyu Han,Chunyu Chen,Hongdou Liu,Hongtao Zou
Nearly 100 million tons of spent mushroom substrates (SMS) are discarded annually in China, which causes a series of environmental pollutants. To improve the nitrogen (N) use efficiency of and to shift dependence away from petroleum-based products, a novel bio-based epoxy coated urea was successfully developed. The bio-based epoxy coating was synthesized from the liquefied SMS and bisphenol-A diglycidyl ether. Subsequently, both nano-SiO 2 and organosilicon were employed to modify the bio-based epoxy and increase its hydrophobicity. Water absorption, ammonium adsorption, and water contact angles of the bio-based epoxy coatings were investigated. The nutrient release behaviors of the bio-based epoxy coated urea in water were also investigated and the modification mechanisms were explored by Fourier transform infrared, scanning electron microscopy–energy-dispersive X-ray spectroscopy and thermogravimetric analysis. The results revealed that the hydrophobic ability of the nano-SiO 2 and organosilicon dual modified bio-based epoxy coated urea coating was significantly enhanced and that its nutrient release longevity was increased to 56 days. Therefore, this work demonstrated that bio-based epoxy coated urea with superior release characteristics exhibited great potential in modern agricultural applications.
研究领域:
环境科学
·
农业科学
✓ 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）