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Journal articles on the topic 'Nanoparticule de silice ultrafine'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Zhang, Qian, and Bai Mei Zhang. "Synthesis and Characterization of Silylated Kaolinite/Silica Core–Shell Nanoparticles." Applied Mechanics and Materials 105-107 (September 2011): 1760–63. http://dx.doi.org/10.4028/www.scientific.net/amm.105-107.1760.

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Studies were conducted on the production of silane modified kaolinite/silica core-shell nanoparticles (SMKS). The SMKS nanoparticles were prepared via the sol–gel technique using tetraethyl oxysilane (TEOS) as the precursor to form silica shells on the surface of kaolinite particles followed with silane treatment. TEM of the unmodified kaolin (ORK) and SMKS revealed that a layer of ultrafine silica particles were deposited on the kaolinite surface to form a new kind of core–shell structure particles.

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2

Li, Juan, Shuhao Qin, Wentao He, et al. "The effect of hybrid nanoparticle with silica sol as the supporter on the crystallization behavior and mechanical properties of isotactic polypropylene." Journal of Polymer Engineering 35, no. 6 (2015): 565–73. http://dx.doi.org/10.1515/polyeng-2014-0243.

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Abstract Colloidal dispersions of hybrid nanoparticles with silica sol as the supporter (PKSol) were prepared by supporting aromatic phosphate on silica sol via a chemical action with γ-aminopropyltrimethylsilane (KH550) as a linker in wet process for the first time. Dynamic light scattering (DLS) demonstrated that hybrid nanoparticles with an average size of about 200 nm were formed and transmission electron microscopy (TEM) confirmed the presence of the ultrafine silica sols within the hybrid particles, which exhibited “currant-bun” particle morphologies, rather than typical “core-shell” structures for most polymer-encapsulated silica particles. Compared to aromatic phosphate alone and silane-modified silica sol, the effect of PKSol on the crystallization behavior and mechanical properties of isotactic polypropylene (iPP) was investigated using a polarized optical microscope (POM) and differential scanning calorimetry (DSC). The results demonstrated that PKSol showed superior nucleating ability on iPP than the other two. After adding 0.2 wt% PKSol, the crystallization peak temperature of iPP increased from 116.35°C to 120.81°C and the crystallinity increased from 39.6% to 50%. Correspondingly, the haze decreased from 37.6% to 23.3% and mechanical properties were improved.

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3

Guo, Ya Jie, Guang Jian Wang, Shuai Zhang, Xue Fang Bo, and Kai Liang Zhang. "Controllable Growth of Ultrafine Silica Particles." Advanced Materials Research 148-149 (October 2010): 1296–99. http://dx.doi.org/10.4028/www.scientific.net/amr.148-149.1296.

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Steady alkalescence monodispersed silicasol were obtained from sodium metasilicate by using chemical precipitation. The process employed low Zeta electric potential controlled growth to achieve big grain diameter 130nm. In this work, the best conditions of grain diameter growth were optimized, which included pH, reaction temperature, digestion time, and so on. The performances of the product have been studied by XRD, IR, Nano Particle Analyzer, ζ electric potential and SEM. Sphericity silica nanoparticles with good stability and high dispersion were obtained, which attained the standard of manufacturing production.

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4

Mohajerani, Burnett, Smith, et al. "Nanoparticles in Construction Materials and Other Applications, and Implications of Nanoparticle Use." Materials 12, no. 19 (2019): 3052. http://dx.doi.org/10.3390/ma12193052.

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Nanoparticles are defined as ultrafine particles sized between 1 and 100 nanometres in diameter. In recent decades, there has been wide scientific research on the various uses of nanoparticles in construction, electronics, manufacturing, cosmetics, and medicine. The advantages of using nanoparticles in construction are immense, promising extraordinary physical and chemical properties for modified construction materials. Among the many different types of nanoparticles, titanium dioxide, carbon nanotubes, silica, copper, clay, and aluminium oxide are the most widely used nanoparticles in the construction sector. The promise of nanoparticles as observed in construction is reflected in other adoptive industries, driving the growth in demand and production quantity at an exorbitant rate. The objective of this study was to analyse the use of nanoparticles within the construction industry to exemplify the benefits of nanoparticle applications and to address the short-term and long-term effects of nanoparticles on the environment and human health within the microcosm of industry so that the findings may be generalised. The benefits of nanoparticle utilisation are demonstrated through specific applications in common materials, particularly in normal concrete, asphalt concrete, bricks, timber, and steel. In addition, the paper addresses the potential benefits and safety barriers for using nanomaterials, with consideration given to key areas of knowledge associated with exposure to nanoparticles that may have implications for health and environmental safety. The field of nanotechnology is considered rather young compared to established industries, thus limiting the time for research and risk analysis. Nevertheless, it is pertinent that research and regulation precede the widespread adoption of potentially harmful particles to mitigate undue risk.

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5

Simonov-Emelyanov, I. D., та A. A. Pykhtin. "The nanoeffeсt in epoxynanocomposites". Plasticheskie massy 1, № 11-12 (2020): 3–6. http://dx.doi.org/10.35164/0554-2901-2019-11-12-3-6.

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It was shown that the distribution of silica nanoparticles (silicon dioxide) and the size of inhomogeneities (heterogeneity level) in the epoxy oligomers and epoxy nanocomposites effect on the structure and properties of epoxy composites.It was established that the maximum value of epoxy composites impact strength is achieved only when the particles of the optimal size (~ 150 nm) are formed in their structure from silica nanoparticles of different grades (BS-50, BS-100 and BS-120), sizes and specific surface.The nano effect in dispersed-filled epoxy composites caused by the formation of clusters of silica nanoparticles of size ~ 150-190 nm was discovered and proved for the first time. It is accompanied by an increase in impact strength by ~2 times and proves the high efficiency of nanoparticles for creating impact-resistant plastics.It was shown that monolithic ultrafine particles of powdered quartz (silicon dioxide) with a particle diameter of ~150 nm lead to an increase in the toughness of epoxy composites by only ~20% and are much less efficient than nanoparticles.

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6

Ledda, Mario, Daniela Fioretti, Maria Grazia Lolli, et al. "Biocompatibility assessment of sub-5 nm silica-coated superparamagnetic iron oxide nanoparticles in human stem cells and in mice for potential application in nanomedicine." Nanoscale 12, no. 3 (2020): 1759–78. http://dx.doi.org/10.1039/c9nr09683c.

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7

Zu, Lei, Shun Yu Han, Kai Gu, and Xiu Guo Cui. "Preparation of Ultrafine Polyethylene-Silica Composite Particle with Core-Shell Structure." Advanced Materials Research 557-559 (July 2012): 554–57. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.554.

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A novel ultrafine polyethylene/silica composite particle with core-shell structure was prepared by the sol-gel method in the presence of the melt polyethylene emulsion. A series of samples with different polyethylene content were prepared to investigate the unique characteristics of this original composite particle. The core-shell structure and composition of the composite particle was proved by the transmission electron microscopy observation and Fourier transform infrared spectra. The composite particles possess a spherical morphology and the mean size is about 160nm, presented by the scanning electronic microscope observation and nanoparticle tracking analysis, respectively.

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8

Lygdenov, V. Ts, Andrey V. Nomoev, V. V. Lygdenov, et al. "Hardening of Silumin by Composite Particles Core/Shell Si@Mg." Solid State Phenomena 310 (September 2020): 134–39. http://dx.doi.org/10.4028/www.scientific.net/ssp.310.134.

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Aspects of increasing the strength of silumin due to the introduction of ultrafine silica powders into its melt are considered. The calculation of the surface energy of silicon oxide nanoparticles showed the promise of this modification. The method is proposed for increasing the adhesion of silicon to aluminum, due to the surface-active properties of magnesium and the high surface energy of nanoparticles, which contributes to the formation of chemical compounds of silicon with aluminum, and as a result, to hardening of the alloy. Due to the large difference in the surface energies of magnesium and silicon, the possibility of producing Si @ Mg core-shell nanoparticles in the one-step method under the action of an electron beam has been shown. The layout of substances in the graphite crucible, the dependence of the electron beam current to obtain Si @ Mg nanoparticles are presented.

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9

El-Safty, Sherif A., Moataz Mekawy, Akira Yamaguchi, Ahmed Shahat, Kazuyuki Ogawa, and Norio Teramae. "Organic–inorganic mesoporous silica nanostrands for ultrafine filtration of spherical nanoparticles." Chemical Communications 46, no. 22 (2010): 3917. http://dx.doi.org/10.1039/c001654c.

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10

Lin, Qi, and Zhijun Sun. "Optical Extinction Properties of Aggregated Ultrafine Silver Nanoparticles on Silica Nanospheres." Journal of Physical Chemistry C 115, no. 5 (2010): 1474–79. http://dx.doi.org/10.1021/jp107822u.

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11

Sawada, Koichi, Shinji Sakai, and Masahito Taya. "Fabrication of Ultrafine Carbon Fibers Possessing a Nanoporous Structure from Electrospun Polyvinyl Alcohol Fibers Containing Silica Nanoparticles." Journal of Nanomaterials 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/487943.

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Ultrafine carbon fibers with a nanoporous structure were fabricated by the template method using silica nanoparticles (NPs) embedded in fibers of approximate diameter 500 nm, electrospun from an aqueous solution of polyvinyl alcohol,CoCl2, silica NPs, andN,N-dimethylformamide. Black, conductive fibers were obtained by heat treatment in air and a chemical vapor deposition reaction under methanol vapor for more than 5 h. Transmission electron microscopy (TEM) demonstrated that the fabricated fibers after silica removal had a porous structure originating from 15 nm diameter silica NPs. Energy dispersive X-ray analysis combined with TEM confirmed the removal of silica from the fibers by NaOH treatment at 80°C. Total surface area and total pore volume of the fibers after silica removal, determined by nitrogen adsorption measurement, were 318 m2/g and 1.67 cm3/g, respectively. The sheet resistivities of the fabricated fibers were 35.1–477 Ω/□, which were relatively high, compared with that reported for polyacrylonitrile-based fibers carbonized at 800°C. D and G bands detected in the Raman spectrum of the NaOH-treated fibers showed that the prepared carbon fibers were more crystalline than natural carbonaceous materials.

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12

Wu, Wei, Xiangheng Xiao, Shaofeng Zhang, et al. "Facile Fabrication of Ultrafine Hollow Silica and Magnetic Hollow Silica Nanoparticles by a Dual-Templating Approach." Nanoscale Research Letters 5, no. 1 (2009): 116–23. http://dx.doi.org/10.1007/s11671-009-9452-1.

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13

Jiang, Chunzhu, Ying Sun, Xi Yu, et al. "Removal of sudan dyes from water with C18-functional ultrafine magnetic silica nanoparticles." Talanta 89 (January 2012): 38–46. http://dx.doi.org/10.1016/j.talanta.2011.11.052.

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14

Park, Sang Ho, Yeon Sung Ryu, and Seong Hun Kim. "Effect of modified silica nanoparticle on the properties of bio-based polyurethane ultrafine fibers." Journal of Materials Science 50, no. 4 (2014): 1760–69. http://dx.doi.org/10.1007/s10853-014-8739-5.

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15

Li, Xiaowei, Ling Zhao, Changlu Shao, Xinghua Li, Wei Sun, and Yichun Liu. "Immobilization of ultrafine Ag nanoparticles on well-designed hierarchically porous silica for high-performance catalysis." Journal of Colloid and Interface Science 530 (November 2018): 345–52. http://dx.doi.org/10.1016/j.jcis.2018.06.045.

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16

Furlan, Ping Y., Alexander Y. Furlan, Kim Kisslinger, Michael E. Melcer, David W. Shinn, and John B. Warren. "Water as the Solvent in the Stober Process for Forming Ultrafine Silica Shells on Magnetite Nanoparticles." ACS Sustainable Chemistry & Engineering 7, no. 18 (2019): 15578–84. http://dx.doi.org/10.1021/acssuschemeng.9b03554.

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17

Shen, Qihui, Yixuan Shan, Yang Lü, et al. "A surfactant‐free synthesis of the silica nanosphere‐supported ultrafine silver nanoparticles and their antibacterial effects." Journal of the Chinese Chemical Society 66, no. 8 (2019): 815–21. http://dx.doi.org/10.1002/jccs.201900105.

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18

Shang, Lu, Tong Bian, Baihui Zhang, et al. "Graphene-Supported Ultrafine Metal Nanoparticles Encapsulated by Mesoporous Silica: Robust Catalysts for Oxidation and Reduction Reactions." Angewandte Chemie International Edition 53, no. 1 (2013): 250–54. http://dx.doi.org/10.1002/anie.201306863.

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19

Shang, Lu, Tong Bian, Baihui Zhang, et al. "Graphene-Supported Ultrafine Metal Nanoparticles Encapsulated by Mesoporous Silica: Robust Catalysts for Oxidation and Reduction Reactions." Angewandte Chemie 126, no. 1 (2013): 254–58. http://dx.doi.org/10.1002/ange.201306863.

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20

Xi, Rubing, Yulu Wang, Xuan Wang, et al. "Ultrafine nano-TiO2 loaded on dendritic porous silica nanoparticles for robust transparent antifogging self-cleaning nanocoatings." Ceramics International 46, no. 15 (2020): 23651–61. http://dx.doi.org/10.1016/j.ceramint.2020.06.138.

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21

Xia, Bing, Chen Dong, WenYi Zhang, Ye Lu, JinHui Chen, and JiSen Shi. "Highly efficient uptake of ultrafine mesoporous silica nanoparticles with excellent biocompatibility by Liriodendron hybrid suspension cells." Science China Life Sciences 56, no. 1 (2012): 82–89. http://dx.doi.org/10.1007/s11427-012-4422-8.

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22

Bilo, Fabjola, Alessandra Zanoletti, Laura Borgese, Laura E. Depero, and Elza Bontempi. "Chemical Analysis of Air Particulate Matter Trapped by a Porous Material, Synthesized from Silica Fume and Sodium Alginate." Journal of Nanomaterials 2019 (March 12, 2019): 1–9. http://dx.doi.org/10.1155/2019/1732196.

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This work shows the ability of a new porous material (SUNSPACE), obtained by industrial by-products, to sequestrate air particulate matter (PM). This activity allows introducing the azure chemistry approach, devoted to better link new remediation strategies and sustainability. In particular, SUNSPACE is synthesized from silica fume and sodium alginate; it can be shaped in a porous solid, and it looks promising for environmental application as nanoparticle sequestration. Studies to evaluate the sequestration capability of SUNSPACE are performed in different environments, with and without anthropogenic sources of PM. Solid SUNSPACE disc samples are used as passive samplers and exposed for one and two months, in vertical and horizontal positions, indoor, and outdoor. Total reflection X-ray fluorescence technique is employed to perform elemental chemical analysis of the entrapped PM. Two sample preparation strategies to evaluate the composition of PM are considered: sample sonication in Milli-Q water and total sample mineralization by microwave acid digestion. These two options are proposed to analyse different PM fractions: in particular, sonication allows removing the coarse PM, entrapped on external material surface pores; on the contrary, digestion can offer information on fine and ultrafine PM, trapped in internal pores. Results confirm the ability of the porous material to sequestrate air PM and the differences in the sample preparation, supported by elemental analysis, and show the difference in the coarse and fine air particulate matter composition. In summary, the new material results as very promising for applications requiring nanoparticle sequestration.

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23

Bao, Hongjie, Yunong Li, Lei Liu, et al. "Ultrafine FeCu Alloy Nanoparticles Magnetically Immobilized in Amine-Rich Silica Spheres for Dehalogenation-Proof Hydrogenation of Nitroarenes." Chemistry - A European Journal 24, no. 54 (2018): 14418–24. http://dx.doi.org/10.1002/chem.201801942.

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24

Zhu, Mengyao, Yabin Shen, Limin Chang, Dongming Yin, Yong Cheng, and Limin Wang. "Enabling high electrochemical activity of a hollow SiO2 anode by decorating it with ultrafine cobalt nanoparticles and a carbon matrix for long-lifespan lithium ion batteries." Nanoscale 12, no. 25 (2020): 13442–49. http://dx.doi.org/10.1039/d0nr02345k.

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25

Chang, Shu-Chi, Yu-Han Yu, Cheng-Hao Li, Chin-Ching Wu, and Hao-Yun Lei. "Highly Efficient Arsenic Removal Using a Composite of Ultrafine Magnetite Nanoparticles Interlinked by Silane Coupling Agents." International Journal of Environmental Research and Public Health 9, no. 10 (2012): 3711–23. http://dx.doi.org/10.3390/ijerph9103711.

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26

Shen, Yirui, Pingping Jiang, Phyu Thin Wai, Pingbo Zhang, and Yuming Dong. "Encapsulated ultrafine and highly dispersed molybdenum dioxide nanoparticles in hollow mesoporous silica spheres as an efficient epoxidation catalyst for alkenes." Journal of Saudi Chemical Society 23, no. 8 (2019): 1157–67. http://dx.doi.org/10.1016/j.jscs.2019.07.004.

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27

Qiao, Xianliang, Tiantian She, Huiling Zhang, et al. "One-pot synthesis of porous silica-supported ultrafine Ni nanoparticles as efficient and stable catalyst for selective hydrogenation of benzophenone." Applied Catalysis B: Environmental 259 (December 2019): 118111. http://dx.doi.org/10.1016/j.apcatb.2019.118111.

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28

Shang, Lu, Tong Bian, Baihui Zhang, et al. "Innentitelbild: Graphene-Supported Ultrafine Metal Nanoparticles Encapsulated by Mesoporous Silica: Robust Catalysts for Oxidation and Reduction Reactions (Angew. Chem. 1/2014)." Angewandte Chemie 126, no. 1 (2013): 2. http://dx.doi.org/10.1002/ange.201310508.

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29

Budi, Canggih Setya, Juti Rani Deka, Diganta Saikia, Hsien-Ming Kao, and Yung-Chin Yang. "Ultrafine bimetallic Ag-doped Ni nanoparticles embedded in cage-type mesoporous silica SBA-16 as superior catalysts for conversion of toxic nitroaromatic compounds." Journal of Hazardous Materials 384 (February 2020): 121270. http://dx.doi.org/10.1016/j.jhazmat.2019.121270.

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30

Shang, Lu, Tong Bian, Baihui Zhang, et al. "Inside Cover: Graphene-Supported Ultrafine Metal Nanoparticles Encapsulated by Mesoporous Silica: Robust Catalysts for Oxidation and Reduction Reactions (Angew. Chem. Int. Ed. 1/2014)." Angewandte Chemie International Edition 53, no. 1 (2013): 2. http://dx.doi.org/10.1002/anie.201310508.

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31

Stefanescu, M., C. Caizer, M. Stoia, and O. Stefanescu. "Ultrafine, perfectly spherical Ni–Zn ferrite nanoparticles, with ultranarrow distribution, isolated in a silica matrix, prepared by a novel synthesis method in the liquid phase." Acta Materialia 54, no. 5 (2006): 1249–56. http://dx.doi.org/10.1016/j.actamat.2005.10.051.

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32

Song, Yan, Fuxing Yin, Chengwei Zhang, Weibing Guo, Liying Han, and Ye Yuan. "Three-Dimensional Ordered Mesoporous Carbon Spheres Modified with Ultrafine Zinc Oxide Nanoparticles for Enhanced Microwave Absorption Properties." Nano-Micro Letters 13, no. 1 (2021). http://dx.doi.org/10.1007/s40820-021-00601-x.

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AbstractCurrently, electromagnetic radiation and interference have a significant effect on the operation of electronic devices and human health systems. Thus, developing excellent microwave absorbers have a huge significance in the material research field. Herein, a kind of ultrafine zinc oxide (ZnO) nanoparticles (NPs) supported on three-dimensional (3D) ordered mesoporous carbon spheres (ZnO/OMCS) is prepared from silica inverse opal by using phenolic resol precursor as carbon source. The prepared lightweight ZnO/OMCS nanocomposites exhibit 3D ordered carbon sphere array and highly dispersed ultrafine ZnO NPs on the mesoporous cell walls of carbon spheres. ZnO/OMCS-30 shows microwave absorbing ability with a strong absorption (− 39.3 dB at 10.4 GHz with a small thickness of 2 mm) and a broad effective absorption bandwidth (9.1 GHz). The outstanding microwave absorbing ability benefits to the well-dispersed ultrafine ZnO NPs and the 3D ordered mesoporous carbon spheres structure. This work opened up a unique way for developing lightweight and high-efficient carbon-based microwave absorbing materials.

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33

Fresquez, Mark R., Clifford H. Watson, Liza Valentin-Blasini, and R. Steven Pappas. "Characterizing the Transport of Aluminum-, Silicon- and Titanium-Containing Particles and Nanoparticles in Mainstream Tobacco Smoke." Journal of Analytical Toxicology, October 12, 2020. http://dx.doi.org/10.1093/jat/bkaa162.

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Abstract The most commonly observed forms of aluminum, silicon and titanium in tobacco products are aluminum silicates (e.g., kaolin), silica and titanium(IV) oxide. These compounds are neither water soluble nor volatile at cigarette combustion temperatures. Rather, they are transported in mainstream tobacco smoke as particles after being freed by combustion from the tobacco filler and can induce pulmonary inflammation when inhaled. Aluminum silicate particles are the most frequently observed particles in the pulmonary macrophages of smokers and have become known as ‘smokers’ inclusions’. A relatively new technique, single particle triple quadrupole inductively coupled plasma-mass spectrometry was used to analyze aluminum-, silicon- and titanium-containing particle deliveries in cigarette and little cigar mainstream tobacco smoke, and to collect information on solid inorganic particles. The mass concentration of aluminum-containing particles transmitted in mainstream smoke was low (0.89–0.56 ng/cigarette), which was not surprising because aluminum silicates are not volatile. Although the collective masses (ng/cigarette) of aluminum-, silicon- and titanium-containing particles under 100 nm diameter transported in mainstream smoke were low, an abundance of ‘ultrafine’ particles (particles &lt; 100 nm or nanoparticles) was observed. Limitations of the particle background equivalent diameter (the smallest detectable particle size (MassHunter 4.5 Software) due to the environmentally ubiquitous silicon background restricted the determination of silica nanoparticles, but silica particles slightly below 200 nm diameter were consistently detected. Aluminum- and titanium-containing nanoparticles were observed in all cigarette and little cigar samples, with titanium(IV) oxide particle deliveries consistently fewer in number and smaller in diameter than the other two types of particles. The highest concentrations of aluminum-containing particles (as kaolin) were in the nanoparticle range with much lower concentrations extending to the larger particle sizes (&gt;100 nm). The number and range of particle sizes determined in mainstream smoke is consistent with pulmonary deposition of aluminum silicates described by other researchers as contributing to the ‘smokers’ inclusions’ observed in pulmonary macrophages.

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34

Ale-Agha, Niloofar, Catrin Albrecht, and Lars-Oliver Klotz. "Loss of gap junctional intercellular communication in rat lung epithelial cells exposed to carbon or silica-based nanoparticles." Biological Chemistry 391, no. 11 (2010). http://dx.doi.org/10.1515/bc.2010.133.

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Abstract The aim of this study was to investigate whether fine and ultrafine carbon black (fC and ufC), and fine and ultrafine silica (fS, ufS) particles affect gap junctional intercellular communication (GJIC) in rat lung epithelial cells. Exposure of cells to subcytotoxic doses of ufC, fS and ufS resulted in a 63%, 59% and 77% reduction of GJIC, respectively, as determined in a dye transfer assay. In contrast to ufC, fC did not significantly alter GJIC. Changes in subcellular localization of the major gap junction protein in RLE cells, connexin-43 (Cx43), and of β-catenin were observed in cells exposed to ufC, fS or ufS. The loss of GJIC was counteracted by N-acetyl cysteine and was largely prevented by specific inhibitors of epidermal growth factor receptor-dependent signaling, pointing to the crucial role of two known major mediators of nanoparticle action, namely reactive oxygen species and membrane-receptor signaling, in particle-induced modulation of GJIC.

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35

Wei, Qilin, Kiersten G. Guzman, Xinyan Dai, Nuwan H. Attanayake, Daniel R. Strongin, and Yugang Sun. "Highly Dispersed RuOOH Nanoparticles on Silica Spheres: An Efficient Photothermal Catalyst for Selective Aerobic Oxidation of Benzyl Alcohol." Nano-Micro Letters 12, no. 1 (2020). http://dx.doi.org/10.1007/s40820-020-0375-9.

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AbstractPhotothermal catalysis represents a promising strategy to utilize the renewable energy source (e.g., solar energy) to drive chemical reactions more efficiently. Successful and efficient photothermal catalysis relies on the availability of ideal photothermal catalysts, which can provide both large areas of catalytically active surface and strong light absorption power simultaneously. Such duplex requirements of a photothermal catalyst exhibit opposing dependence on the size of the catalyst nanoparticles, i.e., smaller size is beneficial for achieving higher surface area and more active surface, whereas larger size favors the light absorption in the nanoparticles. In this article, we report the synthesis of ultrafine RuOOH nanoparticles with a size of 2–3 nm uniformly dispersed on the surfaces of silica (SiOx) nanospheres of hundreds of nanometers in size to tackle this challenge of forming an ideal photothermal catalyst. The ultrasmall RuOOH nanoparticles exhibit a large surface area as well as the ability to activate adsorbed molecular oxygen. The SiOx nanospheres exhibit strong surface light scattering resonances to enhance the light absorption power of the small RuOOH nanoparticles anchored on the SiOx surface. Therefore, the RuOOH/SiOx composite particles represent a new class of efficient photothermal catalysts with a photothermal energy conversion efficiency of 92.5% for selective aerobic oxidation of benzyl alcohol to benzylaldehyde under ambient conditions.

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