PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2019
·Vol. 44
·期 4
·438-446
·
IF 1.634
Qing Zhu,Chun Xiao,Xiao Xie,Bao-hui Zheng,Shang-bin Li,Guan Luo
The appropriate structure and properties of a composite material, including the morphology, particle size, and bond strength, are very important for its performance and practical applications. The energetic material HMX (C 4 H 8 N 8 O 8 , cyclotetramethylenetetranitramine) is typically mixed with nanocatalysts to improve its thermal decomposition, which is advantageous for its detonation performance in practical applications. Inspired by the bioadhesion of mussels, a HMX@PDA@TiO 2 (HMX first coated with PDA film and second coated with TiO 2 nanoparticles) composite was developed in this study to greatly advance the thermal decomposition temperatures. A simple stirring process was used to prepare the composite from HMX and TiO 2 nanoparticles under dopamine solutions with different pH values. Nanocatalyst TiO 2 nanoparticles were anchored on the surface of HMX by reacting with the dopamine and polydopamine coatings. Compared with other reference samples, the thermal behavior of the obtained composite showed that the starting decomposition temperature was lower, at approximately 60 °C, and that the decomposition peak decreased by 35 °C, indicating that the composite properties should have great effects on the thermal performance of the materials. The findings offer a valuable composite preparation method to enhance the thermal behavior and the effect of the catalyst on the composite via bonding effects.
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
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Dingyi Wang,Tingting Zhi,Lihong Liu,Li Yan,Wei Yan,Yinyin Tang,Bin He,Ligang Hu,Chuanyong Jing,Guibin Jiang
Nanomaterials play a crucial role in various areas due to their extraordinary chemical and physical properties. Loading microscopic nanomaterials onto macrostructures is inevitable for their implementation from laboratory experiments to practical applications. Nevertheless, the geometries of conventional supporting structures are usually limited and nanomaterials are easy to be inhomogeneously distributed, aggregated, and lost. Therefore, controllably configuring nanomaterials into sophisticated three-dimensional macroscopic structures without sacrificing their inherent properties remains challenging. Here we utilize the advantages of 3D printing technology to realize this purpose. As a proof-of-concept, the application of 3D stereolithography printed macrostructures containing TiO 2 nano particles (TiO 2 NPs) for direct adsorption removal of As(III) in water was demonstrated. The morphology and distribution of TiO 2 NPs mounted on printed macrostructures were initially characterized. Then batch adsorption experiments were conducted to investigate the effect of the 3D printing process, TiO 2 NPs doped concentration and TiO 2 NP size as well as adsorption kinetics and isotherms. We also demonstrated that 3D printed adsorption structures could be easily reused over 10 times and were effective for raw arsenic-polluted groundwater samples. Our findings show that 3D printing provides a promising route to design and fabricate customized macrostructures endowed with specific properties of nanomaterials.
研究领域:
环境科学
·
材料科学
·
纳米技术
✓ 已验证
DOI
PubMed
高影响因子
Scientific Reports
·
2019
·Vol. 9
·期 1
·1-10
·
IF 4.011
Liu Gonggang,Lu Zhou,Zhu Xiu,Du Xiaoqing,Hu Jinbo,Chang Shanshan,Li Xianjun,Liu Yuan
Bamboo with the outstanding properties, such as good mechanical strength, fast growth rate and low growth cost, is considered as one of utilitarian structural nature materials. But bamboo is easy to get mildewed resulting in disfiguration and fungi corrosion. In this work, a facile method was developed to improve the mildew-proofing capability of bamboo. Mussel-inspired polydopamine (PDA) with biomimetic adhesion function and highly active functional groups was employed to immobilize highly-dispersed Ag and TiO 2 nanoparticles on the surface of bamboo via an in-situ growth method. Integrating the uniform PDA coating, photocatalytic function of TiO 2 nanoparticles and bactericidal role of Ag nanoparticles, the mildew-proofing capability of bamboo is enhanced significantly. The results show a non-covalent interaction is more likely to account for the binding mechanism of PDA to bamboo. And the prepared bamboo samples show good photocatalytic performance and have excellent resistance leachability. Meanwhile, the mildew-proofing property of prepared bamboo sample was greatly improved.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE FORUM
·
2016
·
IF 0
Ting Xi Li,Hai Bo Su,Li Gao,Lin Jiang,Cheng Xiang Zhang,Yong Qin Han,Yanmin Wang,Qing Wang
Improving the mechanical properties and ultraviolet resistant properties of epoxy resin (EP) is attracting the scientists’ increasing interest in engineering industries at present. For this reason, novel Vi-POSS-TiO2/EPnanocomposites were prepared by incorporating nanotitanium dioxide (TiO2) and PSS-Octavinyl substituted (Vi-POSS) organic-inorganic hybridparticles into the epoxy resin. Filling up with TiO2 and Vi-POSS may create an inherent ultraviolet (UV) absorption property and mechanical property, respectively. The obtained composites were characterized by some standard analytical techniques such as UV-vis spectroscopy, Scanning electron microscope (SEM), and Thermal gravity analysis (TGA). When the content of TiO2was 1.5wt%, UV-vis absorption spectra showed that the excellent absorption properties of EP composites can be achieved. When the content of Vi-POSS was 6wt%, the values of bend strength and impact strength were improved 14.75%and37.94%, respectively. The TGA result showed that the thermal stability of EP composites varied in a small range before and after adding 6wt% Vi-POSS.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
Surfaces and Interfaces
·
2024
·
IF 5.7
Jianfang Hu,Hao Song,Mengjie Sun,Bo Wang,Xuchun Wang,Qingsong Guo,Han Li,Shuangjie Wu,Li Huang,Yun Li,Xuming Zhang
The photoelectronchemical (PEC) activity of the photocatalyst is largely dependent on the concentration and lifetime of the photogenerated carriers, however, these carriers are easily and quickly neutralized within the photocatalyst. To address this issue, we designed a superstructure of graphene-intercalated TiO 2 nanoparticles (TiO 2 /G) by pyrolyzing octylamine-intercalated hexafluorotitanic acid hybrids. The inserted graphene accelerates photoelectron transfer and reduces the recombination of photogenerated carriers in the body, while maintains the structural stability. The TiO 2 /G hybrid composite exhibits a low carbon content of only 1.3 wt.%, a strong Ti-C chemical interaction between TiO 2 and intercalated graphene, and a large surface area of 38.88 m 2 /g, nearly five times that of bare TiO 2 (7.96 m 2 /g). The findings from the photocatalytic experiments indicate that the photocatalytic efficiency and photocurrent response of TiO 2 /G are twice and 4.22 times higher, respectively, compared to standard TiO 2 nanoparticles. This indicates a substantial promise for the superstructure in photoelectrochemistry and energy conversion applications.
研究领域:
材料科学
·
能源转换
·
光催化
✓ 已验证
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 25
·10352-10358
·
IF 3.288
Danlin Bu,Na Li,Yu Zhou,Hengyu Feng,Fei Yu,Chunxia Cheng,Ming Li,Linghan Xiao,Yuhui Ao
N-Halamine-based antibacterial materials are widely used due to their excellent characteristics. However, the N–Cl bonds in N-halamine-based materials are not stable under UV light irradiation so that they are difficult to recover and reuse. Here, a kind of N-halamine-immobilized Fe3O4@SiO2@TiO2(F@S@T-Cl) nanoparticles were prepared. In addition, the UV stability and regeneration capacity were also studied after variable time exposure to UV light. The results showed that nanoparticles have great antibacterial properties against Staphylococcus aureus and Escherichia coli. Meanwhile, the N–Cl bond in the nanocomposite showed outstanding storage stability under UV light irradiation and good regeneration ability; the material can realize cyclic utilization and solve the problem of secondary pollution of the antibacterial material. It provides a broader application prospect for the recyclable N-halamine antibacterial material.
研究领域:
材料科学
·
生物学
·
环境科学
✓ 已验证
DOI
高影响因子
Frontiers in Chemistry
·
2017
·
IF 3.994
Yu Xiaopeng,Mi Xueyang,He Zhihui,Meng Minjia,Li Hongji,Yan Yongsheng
Highly selective cellulose acetate (CA)/poly (vinyl alcohol) (PVA)/titanium dioxide (TiO2) imprinted membranes were synthesized by phase inversion and dip coating technique. The CA blend imprinted membrane was synthesized by phase inversion technique with CA as membrane matrix, polyethyleneimine (PEI) as the functional polymer, and the salicylic acid (SA) as the template molecule. The CA/PVA/TiO2 imprinted membranes were synthesized by dip coating of CA blend imprinted membrane in PVA and different concentration (0.05, 0.1, 0.2, 0.4 wt %) of TiO2 nanoparticles aqueous solution. The SEM analysis showed that the surface morphology of membrane was strongly influenced by the concentration of TiO2 nanoparticles. Compared with CA/PVA-TiO2(0.05, 0.1, 0.2%)-MIM, the CA/PVA-TiO2(0.4%)-MIM possessed higher membrane flux, kinetic equilibrium adsorption amount, binding capacity and better selectivity for SA. It was found that the pseudo-second-order kinetic model was studied to describe the kinetic of CA/PVA-TiO2(0.2%)-MIM judging by multiple regression analysis. Adsorption isotherm analysis indicated that the maximum adsorption capacity for SA were 24.43 mg g−1. Moreover, the selectivity coefficients of CA/PVA-TiO2 (0.2%)-MIM for SA relative to p-hydroxybenzoic acid (p-HB) and methyl salicylate (MS) were 3.87 and 3.55, respectively.
研究领域:
环境科学
·
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2015
·
IF 3.34
Qiong Tan,Guiqiu Chen,Guangming Zeng,Anwei Chen,Song Guan,Zhongwu Li,Yanan Zuo,Zhenzhen Huang,Zhi Guo
Immobilized Phanerochaete chrysosporium loaded with TiO 2 nanoparticles (PTNs) are novel high-value bioremediation materials for adsorbing cadmium and for degrading 2,4-dichlorophenol (2,4-DCP). The real-time changes in H + and O 2 fluxes were measured using the noninvasive microtest technique (NMT). The H + influx increased after the addition of 2,4-DCP, and shifted to efflux following the addition of Cd 2+ . The O 2 flux decreased after the addition of both 2,4-DCP and Cd 2+ . A larger Cd 2+ flux was immediately observed after exposure to 0.5 mM Cd 2+ (−351.25 pmol cm −2 s −1 ) than to 0.1 mM Cd 2+ (−107.47 pmol cm −2 s −1 ). The removal of Cd 2+ by the PTNs increased more after treatment with the 0.5 mM exposure solution (27.6 mg g −1 ) than with the 0.1 mM exposure solution (3.49 mg g −1 ). The enzyme activities were analyzed to review the antioxidative defense system of PTNs in a solution containing various concentrations of Cd 2+ . The activities of the coenzyme nicotinamide adenine dinucleotide (NADH) oxidase as well as the enzyme catalase (CAT) plateaued at 6.5 U g −1 FW and 9.7 U g −1 FW, respectively, after exposure to 0.25 mM Cd 2+ . The activity of superoxide dismutase (SOD) increased gradually in solutions containing 0.1–0.6 mM Cd 2+ , and eventually reached a maximum (68.86 U g −1 FW). These results illustrate how the antioxidative defense system and the physiological fluxes of PTNs respond to the stress caused by toxic pollutants .
研究领域:
环境生物学
·
微生物学
✓ 已验证
DOI
PubMed
高影响因子
IRANIAN POLYMER JOURNAL
·
2014
·Vol. 23
·期 7
·513-524
·
IF 1.469
Wu Miao,Zhang Feimin,Yu Jiahui,Zhou Hongye,Zhang Di,Hu Chong,Huang Jin
A kind of light-curing nanocomposite resin, which consisted of reactive monomers, surface-modified TiO 2 nanoparticles and a photoinitiation system, has been developed for the application of dental restoration. It may be noted that the conjugation of glycidyl methylmethacrylate (GMA) onto the surface of TiO 2 nanoparticles (nano-TiO 2 ) contributed to improvement in miscibility between nano-filler and matrix, because the reactive C=C group of GMA participated in curing of the matrix, and hence resulted in the enhancement of mechanical properties. When the content of GMA-modified nano-TiO 2 was 2 wt%, the flexural strength and modulus of the nanocomposite resin reached 147.8 and 2918.3 MPa, respectively, which increased by 21.7 and 30.8 % in contrast to the resin without adding nano-filler. Furthermore, the polymerization shrinkage decreased after incorporating the nano-filler while the degree of monomer conversion and the water sorption for the nanocomposite resins was comparable with those of the resin without nano-filler. In conclusion, this study presented a new method, namely introduction of functional groups onto the nano-filler surface to participate in the reaction of resin monomer, to improve the interfacial adhesion and the resultant miscibility between nano-filler and resin matrix in light-curing dental nanocomposites by chemical linkage mediated with surface-modified specie. Moreover, the enhanced mechanical properties and decreased polymerization shrinkage of nanocomposite resins, which are considered the key to the effects of dental restoration, contributed a great potential as a dental material utilized for caries treatment and prevention.
研究领域:
材料科学
·
牙科学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Yixin Ji,Zhongmin Su,Xiaochun Cui,Zhi Geng,Chi Wang
In recent years, nanofiltration (NF) membranes have garnered significant attention for water treatment and reuse applications, owing to their high separation efficiency, surface charge characteristics, and other advantages. However, the conventional support layer structures in NF membranes exhibit high permeation resistance, limiting their overall performance. To address this issue, an ideal through-hole structural support layer effectively minimizes resistance to water infiltration. The advent of advanced high-precision 3D printing technology facilitates the fabrication of such structures. In this study, a support layer with a straight-through pore structure was fabricated using advanced high-precision 3D printing technology, and the PES-COOH active layer was attached to the surface of the support layer via hydrogen bonding, resulting in the PES-COOH@3DP NF membrane. This innovation substantially reduced the permeation resistance, thereby enhancing the permeation flux of the NF process. The permeability of the PES-COOH@3DP NF membrane reached 6.64 L·m −2 ·h −1 ·bar −1 , which is double that of the PES-COOH@UF NF membrane. By incorporating varying concentrations of TiO 2 nanoparticles (0.5 %, 1 %, 1.5 %) into the photosensitive resin material, a hydrophilic support layer doped with TiO 2 nanoparticles was printed using a 3D printer. This improved the NF membrane's hydrophilicity, thereby enhancing its permeation flux. When the feed solution contained 1000 mg·L −1 Na 2 SO 4 , the [email protected] % TiO 2 3DP NF membrane exhibited a permeability of 8.56 L·m −2 ·h −1 ·bar −1 , 1.5 times that of the PES-COOH@UF NF membrane and 22 % higher than the commercial NF90 membrane, while retaining 98.76 % salt and demonstrating strong chlorine resistance. This study underscores the significant potential of advanced high-precision 3D printing technology, establishing it as a strong contender for next-generation NF membrane desalination development.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ChemPlusChem
·
2019
·Vol. 84
·期 5
·474-480
·
IF 3.441
Yu Fang,Yuanyuan Li,Feng Zhou,Peiyang Gu,Jiadi Liu,Dongyun Chen,Najun Li,Qingfeng Xu,Jianmei Lu
Graphical Rapid removal : A photocatalyst comprising black TiO 2 nanoparticles (BTNs) grown in situ on a porous carbon material (PC) can be used for the efficient photocatalytic degradation of antibiotics and pollutants. Under visible-light irradiation, the photogenerated electrons of BTNs react with O 2 to generate . O 2 − radical species and holes (h + ) which can decompose the adsorbed antibiotics. The PC allows a more efficient adsorption as well as rapid transport of charge carriers and provides more active sites. Porous carbon (PC) materials with high surface area can separate electron–hole pairs and adsorb organic pollutants more effectively. A series of nanocomposites were prepared by anchoring black TiO 2 nanoparticles (BTN) onto PC through a calcination process. Chemical and structural features of samples were examined by X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, powder X-ray diffraction (P-XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses. The resulting adsorption-photocatalysis synergistic effect led to a dramatically improved photocurrent for BTN@PCs, thus indicating the high photocatalytic performance toward water-soluble organic species. For instance, the degradation of tetracycline under visible light reached 90 %, which is higher than that for activated carbon doped onto BTN (57 %) without any additional agents. Moreover, the degradation of other antibiotics (such as oxytetracycline and ciprofloxacin) and methylene blue were also studied, thus showing that this system has the potential to be used for water treatment.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Particuology
·
2017
·
IF 2.621
Chun Shen,Kexia Pang,Le Du,Guangsheng Luo
A facile and green method to prepare Ce-doped TiO 2 nanoparticles supported on porous glass beads is reported. An ion exchange process and subsequent calcination yielded Ce-doped TiO 2 nanoparticles with a mean size of 4.8 ± 0.3 nm. The nanoparticles were dispersed on the surface of porous glass beads. The addition of Ce enhanced the visible light absorption of the TiO 2 nanoparticles in the 400–500 nm spectral window. The band gap of the as-prepared catalyst was 2.80 eV. The Ce-doped TiO 2 nanoparticles immobilized on porous glass beads exhibited excellent photocatalytic activity for the visible-light-degradation of methyl orange (MO) and rhodamine B (RhB); with rate constants of 0.095 and 0.230 min −1 ; respectively. The effects of Ce dosage; reaction duration; and initial solution pH on the conversion of MO and RhB dyes were investigated. The green synthesis and favorable photocatalytic activity makes the Ce-doped TiO 2 nanoparticles immobilized on porous glass an attractive alternative for the efficient degradation of organic pollutants.
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
危险品化学品经营许可证（带存储）