Nanoscale
·
2015
·Vol. 7
·期 32
·13775-13783
·
IF 7.394
Yu Zhang,Pengli Zhu,Gang Li,Wenzhao Wang,Liang Chen,Daoqiang Daniel Lu,Rong Sun,Feng Zhou,Chingping Wong
Highly stable monodispersed nano Cu hydrosols were facilely prepared by an aqueous chemical reduction method through selecting copper hydroxide (Cu(OH)2) as the copper precursor, poly(acrylic acid) (PAA) and ethanol amine (EA) as the complexing agents, and hydrazine hydrate as the reducing agent. The size of the obtained Cu colloidal nanoparticles was controlled from 0.96 to 26.26 nm by adjusting the dosage of the copper precursor. Moreover, the highly stable nano Cu hydrosols could be easily concentrated and re-dispersed in water meanwhile maintaining good dispersibility. A model catalytic reaction of reducing p-nitrophenol with NaBH4 in the presence of nano Cu hydrosols with different sizes was performed to set up the relationship between the apparent kinetic rate constant (kapp) and the particle size of Cu catalysts. The experimental results indicate that the corresponding kapp showed an obvious size-dependency. Calculations revealed that kapp was directly proportional to the surface area of Cu catalyst nanoparticles, and also proportional to the reciprocal of the particle size based on the same mass of Cu catalysts. This relationship might be a universal principle for predicting and assessing the catalytic efficiency of Cu nanoparticles. The activation energy (Ea) of this catalytic reaction when using 0.96 nm Cu hydrosol as a catalyst was calculated to be 9.37 kJ mol−1, which is considered an extremely low potential barrier. In addition, the synthesized nano Cu hydrosols showed size-dependent antibacterial activities against Pseudomonas aeruginosa (P. aeruginosa) and the minimal inhibitory concentration of the optimal sample was lower than 5.82 μg L−1.
研究领域:
材料科学
·
化学
·
生物学
✓ 已验证
DOI
高影响因子
COMBUSTION SCIENCE AND TECHNOLOGY
·
2024
·
IF 1.7
Lianquan Suo,Zhilin Xi,Tong Xia,Tao Chen,Jiawei Han
A new type of biomass environmentally friendly hydrosol (DEP) was proposed to inhibit coal spontaneous combustion (CSC). The DEP consists of two parts, the PDopa side chain solution formed by the redox reaction of Dopa and EGCG and the main chain sol solution formed by the free radical polymerization of AA under the action of APS initiator. The −COOH, −NH2, and −OH in Dopa can be grafted onto the skeleton of the main chain via double strong hydrogen bonding interactions with the −COOH group in PAA to form a stable three-dimensional cross-linked network structure. DEP can inhibit CSC through three aspects: oxygen isolation, increasing the activation energy of coal oxidation, scavenging active groups and free radicals. The calculation simulation results show that EGCG in DEP can remove various active free radicals with lower activation energy at room temperature, breaking the chain cycle reaction of coal spontaneous combustion, which proves its high efficiency. This study provides a new way to apply mussel-inspired adhesion mechanisms to the prevention of CSC.
研究领域:
能源科学
·
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
·
2024
·Vol. 36
·期 12
·04024404
·
IF 3.1
Jihong Jiang,Han Wang,Yanchun Miao,Xiaobin Dong,Yali Li,Zeyu Lu
Due to the large specific surface area and strong van der Waals force, bulk aggregation of nano-TiO2 immediately occurs when it is mixed with fresh cement mixture, limiting its reinforcing efficiency to cement-based materials. This study proposes a novel strategy to improve the mechanical and photocatalytic properties of cement mortar using nano-TiO2 hydrosol instead of conventional nano-TiO2 powder. Compared with pure mortar, the 28-day compressive and flexural strength of mortar with 0.6% by weight nano-TiO2 hydrosol were enhanced by 51% and 15%, respectively, the water absorption and chloride ion diffusion coefficient were decreased by 21% and 31%, respectively. The observed improvements were attributed to the denser microstructure and enhanced micromechanical properties in the bulk matrix and around interfacial transition zone (ITZ), resulting from the better dispersion of nano-TiO2 hydrosol in alkaline environment. In addition, compared with the mortar with nano-TiO2 powder, the degradation efficiency of Rhodamine B and NO by the mortar with nano-TiO2 hydrosol (0.6% by weight) was enhanced by 18.3% and 17.1% at 28 days, respectively. The enhancement resulted from the higher intrinsic photocatalytic activity and larger exposed surface area of nano-TiO2 hydrosol due to better dispersion. The research outcomes demonstrate the potential of using nano-TiO2 hydrosol in cement mortar to significantly increase the mechanical strength, durability, and photocatalytic activity, which can lead to the development of cement-based constructions with the integrated design of functionality and structure.
研究领域:
建筑材料
·
环境工程
·
纳米技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Huidong Tang,Qing Hu,Feng Jiang,Weihui Jiang,Jianmin Liu,Ting Chen,Guo Feng,Tao Wang,Wei Luo
The zircon-based encapsulation carbon black (C@ZrSiO 4 ) inorganic pigments with controllable size were successfully prepared by non-aqueous sol-gel method with the assistance of soft mechano-chemistry (SMC) activation precursors. The XRD and FT-IR results showed that the SMC activation enhanced the reactivity of precursors and facilitated the formation of ZrSiO 4 phase with the calcination temperature at 900–1050 °C, indicating the successfully synthesis of pure ZrSiO 4 phase. The average size of C@ZrSiO 4 inorganic pigments significantly declined from 45.20 to 4.50 μm with the increase of SMC activation time of precursors, however, the L* values of pigments increased from 24.11 to 46.35. It was mainly because of the decreased amounts of protected carbon in ZrSiO 4 matrix and the enhanced light reflectance, which lead to the slight color change from deep black to gray black tone. The colored glaze samples presented a black hue after applied in the ceramic glaze at 1200 °C. Moreover, the black hue intensity of glazed samples was higher than that of the corresponding C@ZrSiO 4 inorganic pigments, indicating the prepared pigments have excellent tinctorial strength and hiding power. These results ensure that the obtained C@ZrSiO 4 inorganic pigments possess the outstanding chromatic performance, excellent high-temperature stability, high chemical stability and suitable particle size, and exhibit great potential in the application of the industrial ceramic decoration.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2021
·
IF 3.995
Yongle Zhang,Lijun Dong,Yan Li,Xiangcai Ge,Guina Ren,Xin Shao,Bo Ge
Superhydrophobic filter paper, cotton and fabric with visible light response performance were produced by immersion in precursor solution. The prepared superhydrophobic composites were suitable for various substrates and enabled the separation of organic solvents and water, and the photodegradation of contaminants. Superhydrophobic filter paper, cotton and fabric achieved oil–water separation efficiency of 99.7%, 99.8% and 99.6% and photoresponse capacity of 424, 431 and 432 nm, respectively. The main active substance of the photodegradation process was h + , according to the calculated reaction coefficient. The positions of the valence and conduction bands of Bi 2 WO 6 were determined to be 2.465 and −0.385 eV. Finally, the mechanical stability between the functional particles and the substrate was analyzed to verify the feasibility of the bulk material design.
研究领域:
材料科学
·
环境科学
·
光催化
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2013
·
IF 2.98
Zhihui Ai,Na Wu,Lizhi Zhang
In this study, we report that highly water dispersible TiO 2 nanocrystals could be synthesized via a facile nonaqueous sol–gel method using titanium tetrachloride and ethanol as the precursors. The resulting TiO 2 samples were 5–10 nm in diameter according to characterizations with X-ray diffraction, transmission electron microscopy, and high resolution transmission electron microscopy. X-ray photoelectron spectroscopy, thermal gravimetric analysis, and Fourier-transform infrared spectroscopy analysis revealed that carbonaceous species were formed and bound on the surface of TiO 2 nanocrystals during the synthesis. These carbonaceous species could prevent the agglomeration of TiO 2 nanocrystals and endow the TiO 2 nanocrystals with highly water dispersible property and superior photocatalytic activity on the degradation of organic pollutant under visible light irradiation. We believe that the resulting TiO 2 nanocrystals with highly water dispersibility and superior photocatalytic activity could find wide applications in many fields.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Huidong Tang,Qing Hu,Weihui Jiang,Jianmin Liu,Guo Feng,Ting Chen,Guangfan Tan,Xiaojun Zhang,Lifeng Miao
A zircon encapsulated carbon black (C@ZrSiO 4 ) pigment with high color rendering was synthesized via facile non-aqueous acetic acid (NAA) assisted sol-gel method using carbon-containing precursors (zirconium n -propoxide and tetraethoxysilane) as in-situ carbon sources. The effects of the NAA amount and heat treatment temperature on the structure and properties of the synthesized encapsulation pigments were characterized by XRD , FT-IR, FE-SEM, HR-TEM, EDS , XPS and CIELAB colorimeter, respectively. The results showed that the C@ZrSiO 4 encapsulated pigments heating at 1000 °C for 2 h in N 2 atmosphere presented a dense and stable encapsulation structure as well as deep dark hue when the mole ratio of NAA and Zr (NAA/Zr) was 3:1, and the chromaticity values were L* = 21.20, a* = 0.56, b* = −0.09 and C ab = 0.57, respectively, which were contributed to the high homogeneity at atomic level in ZrSiO 4 sol and the tight bonding between carbon black carbonized by carbon containing group and zircon matrix. In addition, the pigment exhibited excellent chemical stability, thermal stability and tinctorial strength when it was used in water, acid, alkali, organic solvents and ceramic glaze . Especially, these pigments improved the utilization of raw materials and avoided the use of heavy metals or transition metals as coloring agent, which was an environment-friendly black ceramic pigment.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Bin Feng,Sibo Zhang,Di Wang,Yalong Li,Pai Zheng,Long Gao,Da Huo,Lei Cheng,Shuangying Wei
As the new coronavirus pneumonia swept the world in 2020, the demand for antibacterial products significantly increased. In this study, a soy protein isolate nano-silver hydrosol was prepared using an environmentally friendly Ag + in situ reduction process, where the soy protein was ultrasonically blended with polyacrylic resin to obtain a polyacrylate-nano silver antibacterial wood coating. The structure of the soy protein isolate nano-silver hydrosol was assessed, and the structure and antibacterial and mechanical properties of the film were characterized. The results showed that the silver nanoparticles (AgNPs) exhibited good crystallinity and were evenly distributed in the emulsion. The composite film had good antibacterial properties against gram-negative bacteria represented by Escherichia coli and gram-positive bacteria represented by Staphylococcus aureus . With increased nano-silver content, the diameter of the inhibition zone increased from 0 to 30 mm, and from 18 to 50 mm for the two bacteria, respectively. Moreover, the elastic modulus of the film increased from 8.173 to 97.912 MPa, and the elongation at break decreased from 240.601 to 41.038% as the content of AgNPs changed from 0.1 to 1%, respectively. Thus, this study provides a new method for preparing waterborne polyacrylate coatings with excellent antibacterial properties.
研究领域:
材料科学
·
化学
·
环境科学
·
生物技术
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Fan-long Zeng,Mu Yang,Jing-lei Qin,Feng Teng,Yi-quan Wang,Gen-xiang Chen,Da-wei Wang,Hong-shang Peng
Encapsulation of luminescent perovskite quantum dots (QDs) into a solid matrix has been approved to be an efficient way to improve their stability. In this work, we reported a green encapsulation method to produce ultrastable CH3NH3PbBr3 QDs incorporated into the SiO2 matrix. Specifically, fresh-prepared CH3NH3PbBr3 QDs were covalently embedded into silica by an aqueous sol–gel method assisted with CH3NH3Br, which not only effectively inhibited the water-driven degradation of QDs through surface coordination, but also strongly stabilized the QDs in solid powder via concentration gradient. As far as we know, this silica encapsulation of perovskite QDs in aqueous environments is reported for the first time. Luminescent properties of perovskite QDs during the course of gelation as well as in resulting composite powder were investigated using steady-state and time-resolved spectroscopies, and a 2 wt % QD-doped sample treated with 11.5 mM of CH3NH3Br was demonstrated to be the optimal phosphor. The green-emissive phosphor had a PLQY of 60.3% and a full width at half maxima of ∼25 nm, exhibiting ultrahigh stability tested by cycle heating (120 °C), continuous heating (80 °C, 60 h), and light irradiation (450 nm light, 350 h). The phosphor was readily blended with polymers and applied as a color-converting layer on blue light-emitting diodes.
研究领域:
材料科学
·
纳米技术
·
光电
✓ 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）