Polymers
·
2024
·Vol. 17
·期 1
·21
·
IF 4.7
Guanghua Zhang,Ruijun Liu,Wanbin Zhang,Kangmin Zhang,Junfeng Zhu,Ce Zhang
This study introduces a novel water-insoluble dispersant for coal water slurry (CWS), namely, a poly(sodium styrene sulfonate)-graftedSiO2nanoparticle (SiO2-g-PSSNa). SiO2-g-PSSNa was synthesized by combining the surface acylation reaction with surface-initiated atom transfer radical polymerization (SI-ATRP). Fourier transform infrared spectrometry (FTIR), X-ray photoelectron spectroscopy (XPS), energy dispersive spectrometer (EDS), nuclear magnetic resonance spectroscopy (NMR) and thermogravimetric analysis (TGA) verified that SiO2-g-PSSNa with the desired structure was successfully obtained. Afterwards, the performance of SiO2-g-PSSNa as a dispersant in CWS preparation was evaluated. The results indicated that the optimal dosage of SiO2-g-PSSNa was 0.3%. Compared to the famous commercial products, PSSNa and lignosulfonate (LS), SiO2-g-PSSNa exhibits improved viscosity reduction performance. When SiO2-g-PSSNa was used as the dispersant, the maximum coal loading of CWS was 64.2%, which was higher than LS (63.4%) and PSSNa (63.9%). All CWSs obtained in this study were pseudoplastic fluids and more consistent with the Herschel–Bulkley rheological model. The turbiscan stability index (TSI) of CWS prepared with SiO2-g-PSSNa was 0.05, which was significantly lower than CWSs obtained from PSSNa (0.30) and LS (0.36). Therefore, SiO2-g-PSSNa also exhibits excellent stability performance. This result was confirmed by rod penetration tests. The underlying mechanism was also clarified by various measurements, such as contact angle, zeta potential, EDS and low-field nuclear magnetic resonance spectra (low-field NMR). The results reveal that SiO2-g-PSSNa can adsorbed onto the coal surface. SiO2-g-PSSNa possesses a special branched structure, which bears a higher charge density as compared to linear ones with approximate chemical composition. As a result, coal particles adsorbed with SiO2-g-PSSNa exhibit more electronegativity. With the enhancement of the electrostatic repulsive between coal particles, the apparent viscosity was lowered and the static stability was improved. This study demonstrated that solubility in water is not an essential factor in engineering the dispersant. Densely charged groups are probably more important.
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ACS Applied Polymer Materials
·
2024
·
IF 4.4
Liangyong He,Bin Yang,Sen Wang,Yuqing Yang,Yingying Wang,Haiyang Hu,Zhengzhi Zheng,Jiashuo Liu,Jiasheng Qian,Jibin Miao,Weiguo Zhang,Yuchao Ke
The increasing demand for improving the performance of optical devices and the development of nanotechnology have driven research on diffusion films. The preparation of diffusion films with well-defined microstructures can achieve uniform diffusion and scattering of light, thereby improving the efficiency and performance of optical devices. In this study, diffusion films with high transmittance and haze were prepared using PMMA@TiO2@SiO2 (P@T@S) composite microspheres, and the PMMA microspheres and nanoparticles were combined through electrostatic attraction. As compared with PMMA microspheres, the P@T@S composite microspheres displayed better heat resistance as well as swelling resistance. Optical performance data showed that the P@T@S diffusion film had the perfect optical performance with a transmittance up to 90.5% and a haze of 88.3%. The excellent light diffusion effect of the P@T@S diffusion film was experimentally demonstrated, with the light through the film not only displaying the largest area but also maintaining a relatively high brightness. Our findings can provide reference and guidance for further development of light diffusion films, which are of potential application in optoelectronic devices.
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Silicon
·
2025
·
IF 3.3
Cui Meng-Jie,Muhammad Imran,Ren Tie-Zhen,Okitsu Kenji,Fan Wei,Zhang Xue-Jun
Rice husk ash (RHA), obtained through pyrolysis of rice husk (RH), is primarily composed of silicon dioxide (SiO 2 ). However, a conventional thermal treatment produces harmful byproducts, that can pollute the environment and harm biological health. Meanwhile, energy consumption hinders scaling up a conventional producing technique. Here, an electron-assisted thermal decomposition (EATD) technology was developed to obtain silicon dioxide (SiO 2 ), which included two mixed crystal phases: cristobalite and tridymite. The influence of temperature on the SiO 2 structure was examined through the various structural characterizations. Based on the experimental findings, we emphasized that the EATD process induced specific structural phase and glass transition owning to the radiated heat system. Notably, the prepared samples displayed the ability as a chemical sensor for Cr 6+ and photocatalyst for methylene blue (MB) degradation. This unique characteristic improved the detection signal for Cr 6+ by at least twofold, resulting in a streamlined detection technique that reduced the risk of secondary pollution.
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OPTICS COMMUNICATIONS
·
2025
·
IF 2.5
Ou Hai,Keke Guan,Tong Li,Zhiyuan Yu,Peng Li,Hang Li,Jiaxin Qin,Xin An
Perovskite quantum dots have become a research hotspot due to their excellent luminescence properties such as high PLQY and narrow half-wide peaks, but the complex preparation process and poor stability are the main problems affecting their application. In this study, CsPbX 3 (X = Br,I) quantum dots were uniformly grown in situ in the inner pores of SiO 2 aerogels by molten salt method in the case of all inorganic ligands, so that perovskite quantum dots can be generated and effectively protected at the same time. The CsPbBr 3 @SiO 2 aerogel and CsPbI 3 @SiO 2 aerogel composites exhibit highest luminescence intensities at 523 nm and 680 nm respectively, and have narrow half-peak widths (20 nm and 40 nm). At the same time, they have enhanced stability under air, UV lamp and high temperature. After 7 days of exposure to air and UV lamp, the PL strength of the CsPbBr 3 @SiO 2 aerogel composites remained 74.5 % and 133 % respectively. Finally, the green and white LED devices have been successfully constructed by laminating CsPbX 3 @SiO 2 aerogel composites on the surface of a 460 nm chip. These characteristics have laid a good foundation for the application of LED devices, and at the same time, CsPbX 3 @SiO 2 aerogel composites show great potential in luminescence applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2025
·
IF 5.4
Chen-Xiang Wang,Dao-Xiong Chen,Tao Zhu,Xue-Fen Zhang
Superhydrophobic composite coatings, composed of hydrophobic nanoparticles and adhesive, hold great potential for protecting aluminum alloys from corrosion. However, most existing coatings consider single interfacial stability. This study developed a double-interface reinforced superhydrophobic SiO 2 composite coating on etched aluminum alloys by applying the epoxy polymer (EP) primer followed by spraying a mixture of EP, polydimethylsiloxane (PDMS), and hydrophobic SiO 2 nanoparticles. The etched substrate and the intermediate EP layer effectively resolved the issue of weak interfacial bonding between the substrate and the coating, while the simultaneous incorporation of EP and PDMS ensured robust interactions within the coating itself. The resulting coating demonstrates remarkable mechanical durability and chemical stability. Notably, the coating also displays self-healing capabilities during 19 plasma cycles and provides up to 99.99 % corrosion inhibition efficiency, along with superior self-cleaning and anti-fouling properties. This study presents a novel strategy for constructing durable superhydrophobic coatings on aluminum alloys for corrosion protection.
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Nanomaterials
·
2025
·Vol. 15
·期 8
·569
·
IF 4.3
Jin Hu,Fangfang Liu
The low energy density (Ud) of polymeric dielectrics is unfavorable for the integration and miniaturization of electronics, thus limiting their application prospects. Introducing high-εr(dielectric constant) ceramic nanofillers to polymer matrices is the most common strategy to enhance theirεr,and hence theirUd. By comparison, enhancing breakdown strength (Eb) is a more effective strategy to enhanceUd. Herein, 0.6BaTiO3-0.4Bi(Mg0.5Ti0.5)O3and 0.85BaTiO3-0.15Bi(Mg0.5Zr0.5)O3nanofibers coated with SiO2were utilized as fillers in PVDF-based nanocomposites. The combination of experimental and simulation results suggests that the intrinsic properties of nanofillers are the determining factor of theEbof polymer-based nanocomposites, and SiO2coating and film structure design are effective strategies to enhance theirEb, and consequently theirUd. As a result, the sandwich-structured PVDF/6 wt% 0.85BaTiO3-0.15Bi(Mg0.5Zr0.5)O3@SiO2nanofiber within PVDF/PVDF nanocomposite films achieved a maximumUdof 11.1 J/cm3at anEbof 458 MV/m, which are 2.15 and 1.40 times those of pristine PVDF, respectively.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2025
·
IF 8.3
Guang Yang,Qiang Hu,Haiping Yang,Yang Yang,Wei Cheng,Jiageng Xia,Hanping Chen
Catalytic reforming technology holds significant potential for treating biomass gasification tar. However, the design of catalysts that offer high activity, low carbon deposition, and long-term stability remains a challenge. In this study, Ni@SiO 2 yolk-shell catalysts were synthesized and evaluated for their activity and stability in toluene steam reforming. The Ni@SiO 2 -10 catalyst demonstrated excellent stability and activity, maintaining a 100 % toluene conversion rate over a 120-h test period with virtually no carbon deposition after reforming. In contrast, Ni/SiO 2 and Ni/Al 2 O 3 catalysts, synthesized by incipient wetness impregnation, showed significant sintering and carbon deposition after use. Under identical support conditions, Ni@SiO 2 reduced the initial reaction temperature for toluene steam reforming from 462 °C to 418 °C. Increasing the Ni loading significantly enhanced the number of active sites, decreased the size of the SiO 2 microspheres, and thinned the SiO 2 shell layer, thereby elevating the toluene conversion from 72 % to 100 %. Both temperature and the GHSV (gas hourly space velocity) had a significant impact on catalytic performance, with conversion rates stabilizing at 700 °C and an GHSV = 24500 h −1 . The yolk-shell structure of Ni@SiO 2 promoted high Ni dispersion, reducing aggregation and carbon deposition, which were key to its high activity and stability. These findings are crucial for the development of catalysts for biomass tar reforming.
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JOURNAL OF CHROMATOGRAPHY B-ANALYTICAL TECHNOLOGIES IN THE BIOMEDICAL AND LIFE SCIENCES
·
2025
·
IF 2.8
Xuerui Zhang,Shuo Wang,Yixin Ren,Xiaoting Fu,Xiaodong Bi,Xia Wang,Ru-Song Zhao
The pentafluorophenyl (PFP)-functionalized stationary phases, due to their unique hydrophobicity and fluorophilic affinity, have received increasing attention in separation science. How to introduce PFP group effectively with a green chemistry approach has become an important issue. This work provided a facile and green synthetic route for preparing PFP@SiO 2 column. The liquid chromatography (LC) performance towards pharmaceutical molecules such as phenolic acids, flavonoids, and antiviral drugs was systematically explored. The results showed the PFP@SiO 2 column possessed a low back pressure and good solvent endurance (less affected by solvent effect). Under gradient elution mode, the column also showed a higher separation efficiency and good quantitative capacity towards complex natural product ( Sanguisorbae Radix Carbonisatum extract), which met the requirements of current standards and regulations. This work provides a facile green synthesis approach for preparing highly-performed PFP@SiO 2 column for pharmaceutical applications, and a powerful tool for biomedicine.
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Surfaces and Interfaces
·
2025
·
IF 6.3
Chuanjin Lin,Guoquan Suo,Jiarong Li,Rongrong Mu,Laraib Habib,Xiaojiang Hou,Shukai Ding,Jianfeng Zhu
Water-induced deterioration poses a significant threat to sandstone cultural heritage, necessitating effective protective measures. This research investigates a fluorine dual-modified nanocomposite coating composed of nanoplate-like TiO 2 and nanoparticle SiO 2 , utilizing 1H, 1H, 2H, 2H-perfluorodecyl triethoxysilane as the modifier. The study aims to optimize the modifier concentration for enhanced hydrophobicity , while also assessing the coating’s penetration depth and its effect on sandstone breathability. An optimal formulation, consisting of a TiO 2 -to-SiO 2 mass ratio of 75:25 combined with 80 µL of the perfluorodecyl triethoxysilane modifier, yielded exceptional water and oil contact angles of 150.1° and 139.3°, respectively. Even after 210 h of UV exposure, the coating exhibited remarkable stability, with only a minor decrease in contact angles. Furthermore, the treatment effectively preserved the air permeability of the sandstone. This F-modified nanoplate TiO 2 /nanoparticle SiO 2 composite coating demonstrates significant potential for the long-term protection of sandstone cultural relics against environmental weathering, offering a balance of high hydrophobicity and breathability.
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APPLIED CATALYSIS A-GENERAL
·
2017
·
IF 4.339
Tianye Guo,Qineng Xia,Yi Shao,Xiaohui Liu,Yanqin Wang
A new route is reported for the direct deoxygenation of lignin model compounds to aromatic hydrocarbons via the catalytic hydrogen transfer reactions over Ru/Nb 2 O 5 -SiO 2 catalyst with 2-PrOH as a hydrogen donor. It is found that Ru/Nb 2 O 5 -SiO 2 catalyst is active for the hydrodeoxygenation of p -cresol with 98.5% conversion and 84.0% yield of toluene at 230 °C, owing to the significant promotion effect of NbO x species on C O bond cleavage and the proper transfer hydrogenation activity of Ru. Furthermore, Ru/Nb 2 O 5 -SiO 2 catalyst also shows excellent performances in the transfer hydrodeoxygenation of various lignin model compounds such as 2-methoxy-4-methyl phenol, benzyl phenyl ether (α-O-4 model compound), 2-(2-methoxyphenyl)oxy-1-phenethanol (β-O-4 model compound) and even the real lignin extracted from birch, into aromatic hydrocarbons with 2-PrOH as the hydrogen donor. The reaction pathway studies of these model compounds demonstrate that the direct deoxygenation (DDO) is the main reaction route over Ru/Nb 2 O 5 -SiO 2 catalyst in the presence of 2-PrOH. Here, using 2-PrOH as a hydrogen source is found to be more selective to aromatic hydrocarbons than using molecular hydrogen. This work provides a new way for the high selective production of aromatic hydrocarbons from renewable lignin via the catalytic hydrogen transfer reactions.
研究领域:
化学工程
·
催化
·
可再生能源
·
有机化学
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Colloid and Interface Science Communications
·
2020
·
IF 2.831
Gaoqi Wang,Lei Chen,Ding Weng,Jiadao Wang
The purpose of the work is to evaluate the effect of extracellular polymeric substance (EPS) on the surface properties of Streptococcus mutans , and on the interaction between the bacteria and anti-adhesion nanostructured surfaces. Interactions between Streptococcus mutans with or without EPS and nanostructured surfaces were measured with atomic force microscope. Acid-base, Van der Waals, and electrostatic interactions were evaluated according to XDLVO theory. The absorption of glucan was evaluated by quartz crystal microbalance method. Results indicate Streptococcus mutans adhere stronger on surfaces with lower surface energy in both EPS and non-EPS conditions, because acid-base interaction is dominant. It indicates the superhydrophobic surface is lack of durability and reliability in the underwater anti-adhesion. Larger adhesion forces of Streptococcus mutans are shown in EPS than non-EPS conditions. That is due to more hydrogen bonds formed between glucan and substrate surfaces, and the EPS reducing surface energy and affecting acid-base interaction.
研究领域:
微生物学
·
材料科学
·
生物医学工程
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COLLOID AND POLYMER SCIENCE
·
2014
·Vol. 293
·期 2
·463-471
·
IF 2.41
Qi Dongming,Liu Chenghai,Chen Zhijie,Dong Guifang,Cao Zhihai
Poly(methyl methacrylate- co -butyl acrylate) (poly(MMA- co -BA))/SiO 2 nanocomposite particles with various morphologies were prepared through in situ emulsion copolymerization of methyl methacrylate and butyl acrylate using surface 3-(methacryloyloxy) propyl trimethoxysilane (MPS)-modified SiO 2 nanoparticles as nanofillers. The surface MPS-coupling density of SiO 2 nanoparticles could influence the hydrophilic–lipophilic properties of SiO 2 nanoparticles and subsequently influence the particle morphology of poly(MMA- co -BA)/SiO 2 nanocomposite particles. With the increase of the surface MPS-coupling density of SiO 2 nanoparticles, the morphology of nanocomposite particles changed from a raspberry-like one to a guava-like one. A formation mechanism of nanocomposite particles with various morphologies was proposed on the basis of the results of polymerization kinetics, particle size evolution in the process of polymerization, and particle size and morphology of the final nanocomposite particles.
研究领域:
材料科学
·
化学工程
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