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Artículos de revistas sobre el tema "Silica Tubes"

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Autor: Grafiati
Publicado: 6 de septiembre de 2023

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1

Tsujino, Tetsuhiro, Hideo Masuki, Masayuki Nakamura, Kazushige Isobe, Hideo Kawabata, Hachidai Aizawa, Taisuke Watanabe et al. "Striking Differences in Platelet Distribution between Advanced-Platelet-Rich Fibrin and Concentrated Growth Factors: Effects of Silica-Containing Plastic Tubes". Journal of Functional Biomaterials 10, n.º 3 (17 de septiembre de 2019): 43. http://dx.doi.org/10.3390/jfb10030043.

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Compared with platelet-rich plasma, the preparation of platelet-rich fibrin (PRF) is simple and has not been overly modified. However, it was recently demonstrated that centrifugation conditions influence the composition of PRF and that silica microparticles from silica-coated plastic tubes can enter the PRF matrix. These factors may also modify platelet distribution. To examine these possibilities, we prepared PRF matrices using various types of blood-collection tubes (plain glass tubes and silica-containing plastic tubes) and different centrifugation speeds. The protocols of concentrated growth factors and advanced-PRF represented high- and low-speed centrifugation, respectively. Platelet distribution in the PRF matrix was examined immunohistochemically. Using low-speed centrifugation, platelets were distributed homogeneously within the PRF matrix regardless of tube types. In high-speed centrifugation, platelets were distributed mainly on one surface region of the PRF matrix in glass tubes, whereas in silica-coated tubes, platelet distribution was commonly more diffusive than in glass tubes. Therefore, both blood-collection tube types and centrifugal conditions appeared to influence platelet distribution in the PRF matrix. Platelets distributed in the deep regions of the PRF matrix may contribute to better growth factor retention and release. However, clinicians should be careful in using silica-coated tubes because their silica microparticles may be a health hazard.
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2

Ochiai, Tsuyoshi, Shoko Tago, Hiromasa Tawarayama, Toshifumi Hosoya, Hitoshi Ishiguro y Akira Fujishima. "Fabrication of a Porous TiO2-Coated Silica Glass Tube and Its Application for a Handy Water Purification Unit". International Journal of Photoenergy 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/584921.

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A simple, handy, reusable, and inexpensive water purification unit including a one-end sealed porous amorphous-silica (a-silica) tube coated with 2 μm of porous TiO2photocatalyst layers has been developed. Both TiO2and a-silica layers were formed through outside vapor deposition (OVD). Raman spectrum of the porous TiO2-coated a-silica glass tube indicated that the anatase content of the TiO2layers of the tube was estimated to be approximately 60 wt%. Developed porous TiO2-coated a-silica glass tube has been assayed for the tube filtering feature againstEscherichia coli(E. coli) solution used as one of the typical bacteria size species or Qβphage also used as typical virus size species and compared with the feature of porous a-silica tubes alone. The tubes removedE. colicompletely from the aqueous suspension which contained 106 CFU/mL ofE. coliwithout UV irradiation. The porous TiO2-coated a-silica glass tube with UV-C lamps successfully reduced the Qβphage amount in the suspension from 109to 103 PFU/mL.
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3

Makki, Rabih, László Roszol, Jason J. Pagano y Oliver Steinbock. "Tubular precipitation structures: materials synthesis under non-equilibrium conditions". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 370, n.º 1969 (28 de junio de 2012): 2848–65. http://dx.doi.org/10.1098/rsta.2011.0378.

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Inorganic precipitation reactions are known to self-organize a variety of macroscopic structures, including hollow tubes. We discuss recent advances in this field with an emphasis on experiments similar to ‘silica gardens’. These reactions involve metal salts and sodium silicate solution. Reactions triggered from reagent-loaded microbeads can produce tubes with inner radii of down to 3 μm. Distinct wall morphologies are reported. For pump-driven injection, three qualitatively different growth regimes exist. In one of these regimes, tubes assemble around a buoyant jet of reactant solution, which allows the quantitative prediction of the tube radius. Additional topics include relaxation oscillations and the templating of tube growth with pinned gas bubble and mechanical devices. The tube materials and their nano-to-micro architectures are discussed for the cases of silica/Cu(OH) 2 and silica/Zn(OH) 2 /ZnO tubes. The latter case shows photocatalytic activity and photoluminescence.
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4

Tsujino, Tetsuhiro, Akira Takahashi, Sadahiro Yamaguchi, Taisuke Watanabe, Kazushige Isobe, Yutaka Kitamura, Takaaki Tanaka, Koh Nakata y Tomoyuki Kawase. "Evidence for Contamination of Silica Microparticles in Advanced Platelet-Rich Fibrin Matrices Prepared Using Silica-Coated Plastic Tubes". Biomedicines 7, n.º 2 (19 de junio de 2019): 45. http://dx.doi.org/10.3390/biomedicines7020045.

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Platelet-rich fibrin (PRF) therapy has been widely applied in regenerative dentistry, and PRF preparation has been optimized to efficiently form fibrin clots using plain glass tubes. Currently, a shortage of commercially available glass tubes has forced PRF users to utilize silica-coated plastic tubes. However, most plastic tubes are approved by regulatory authorities only for diagnostic use and remain to be approved for PRF therapy. To clarify this issue, we quantified silica microparticles incorporated into the PRF matrix. Blood samples were collected into three different brands of silica-containing plastic tubes and were immediately centrifuged following the protocol for advanced-PRF (A-PRF). Advanced-PRF-like matrices were examined using a scanning electron microscope (SEM), and silica microparticles were quantified using a spectrophotometer. Each brand used silica microparticles of specific size and appearance. Regardless of tube brands and individual donors, significant, but not accidental, levels of silica microparticles were found to be incorporated into the A-PRF-like matrix, which will be consequently incorporated into the implantation sites. Presently, from the increasing data for cytotoxicity of amorphous silica, we cannot exclude the possibility that such A-PRF-like matrices negatively influence tissue regeneration through induction of inflammation. Further investigation should be performed to clarify such potential risks.
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5

Naznin, L., D. Saha, S. Sultana y MMK Sarkar. "Interference in Serum Lithium Estimation by Silica Clot Activator and Silicone Surfactant in ISE Principle: a Cross-Sectional Study". Bangladesh Journal of Medical Biochemistry 8, n.º 2 (23 de julio de 2017): 60–65. http://dx.doi.org/10.3329/bjmb.v8i2.33281.

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Serum lithium concentration is monitored to ensure patient's compliance and to avoid intoxication and thus it is a prerequisite for an individual's dose adjustment. An unavoidable error during lithium estimation in blood collected in 'red-top plastic vacutainer plus tube containing silica clot activator and silicone surfactant' by ISE appeared as a reality for a standard laboratory like AFIP. The error could not be detected even by proven internal and external QC. This cross-sectional study was carried out at AFIP Chemical Pathology Department from May' 2015 to July'2015 to find out the interference causing falsely elevated serum lithium concentration by ISE principle. Blood were collected from the 40 study subjects including 30 healthy volunteers, who never took Tab Lithium and 10 patients, who used to take Tab Lithium for bipolar mood disorder in both 'plain red-top plastic vacutainer tubes without additive' as well as 'plain red-top plastic vacutainer plus tube containing silica clot activator and silicone surfactant'. Lithium concentrations were estimated in both types of tubes by Ion-Selective Electrode (ISE) principle employing world class, USA manufactured analyzer NOVA-4 as well as by colorimetric method using Dade Dimension, Siemens. Serum lithium concentrations were undetectable for the 'lithium-free normal volunteers' in both types of tubes measured by colorimetry but in ISE principle it was undetectable when collected in plain test tube without additives but when collected in 'vacutainer plus tube containing silica clot activator and silicone surfactant' and measured by ISE technique, the mean serum lithium concentration was found to be 1.78 ±0.40 mmol/l. Besides, mean serum lithium concentration of 10 individuals taking Tab Lithium had no statistically significant difference while measured by ISE or colorimetry in 'vacutainer tubes without additive' and also in 'vacutainer plus tubes containing silica clot activator and silicone surfactant' measured by colorimetry. But, vacutainer plus tubes containing silica clot activator and silicone surfactant' while measured serum lithium concentration by ISE principle had significant (p <0.001) increase in mean concentration than others, as determined by one-way ANOVA and Post-hoc tests. This study demonstrates that positive interference; caused by silica clot activator and silicone surfactant of the collection tubes; increases measured concentration of lithium. This interference; being in the pre-analytic phase, cannot be detected by routinely performed laboratory quality control.Bangladesh J Med Biochem 2015; 8(2): 60-65
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6

Brady, Allison M., Brady L. Spencer, Ann R. Falsey y Moon H. Nahm. "Blood Collection Tubes Influence Serum Ficolin-1 and Ficolin-2 Levels". Clinical and Vaccine Immunology 21, n.º 1 (30 de octubre de 2013): 51–55. http://dx.doi.org/10.1128/cvi.00607-13.

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ABSTRACTThe ficolins are members of a recently discovered family of host innate opsonins that can activate the lectin pathway of complement. The ficolins bind many ligands, although they are typically described as binding acetylated sugars. Ficolin-1 (M-ficolin) and ficolin-2 (L-ficolin) are known to bindStreptococcus pneumoniaeserotypes 19C and 11A, respectively. While studying the binding of ficolins to pneumococci, we found variations in ficolin-2 binding among serum samples collected in different types of blood collection tubes. Plastic tubes, which contain a silica clot activator, yielded sera with reduced ficolin-2 binding and apparent ficolin-2 levels. We found that the silica clot activator eluted from plastic red-top tubes inhibited ficolin-2 ligand binding, while other related proteins, like mannose-binding lectin (MBL) and ficolin-1, were not affected. These tube types did not affect the concentrations of other related opsonins (C1q, MBL, or ficolin-3 [H-ficolin]). Interestingly, we also found that ficolin-1 levels were increased 2- to 3-fold in plastic serum separator tubes compared to the increases in other tube types. These findings have implications for future ficolin-1 and ficolin-2 studies, as proper sample collection and handling are essential.
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7

Chen, Hong Liang, Bin Bin Yang, Ji Song Yang, Yan Wang y Hui Ying Li. "Synthesis of Silicalite-1 Membrane with High-Thermal Stability on Silica Tubes by In Situ Hydrothermal Synthesis". Applied Mechanics and Materials 692 (noviembre de 2014): 391–95. http://dx.doi.org/10.4028/www.scientific.net/amm.692.391.

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Silicalite-1 membranes with high-thermal stability were prepared on silica tubes by two-step hydrothermal synthesis after filling the tubes with water and glycerol mixtures. It was found that the filling method can improve the membrane separation performance effectively. After filling the silica tubes with mixed solution, the average flux of silicalite-1 membranes was improved by 23% while keeping the separation selectivity nearly unchanged. The results showed that the silicalite-1 membrane still showed high separation performance towards ethanol/water mixture after the repeated calcination at 400°C for 5 h, even with a calcination rate of 4 °C/min, which suggested that silica tubes may be very suitable to synthesize high-performance silicalite-1 membranes in large area.
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8

Chen, Chih-Chieh, Chen-Hsiung Wu, Sheng-Hsiu Huang y Yu-Mei Kuo. "Aerosol Penetration through Silica Gel Tubes". Aerosol Science and Technology 36, n.º 4 (abril de 2002): 457–68. http://dx.doi.org/10.1080/027868202753571278.

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9

Ávila-Gonzalez, Cesia, Rodolfo Cruz-Silva, Carmina Menchaca, Selene Sepulveda-Guzman y Jorge Uruchurtu. "Use of Silica Tubes as Nanocontainers for Corrosion Inhibitor Storage". Journal of Nanotechnology 2011 (2011): 1–9. http://dx.doi.org/10.1155/2011/461313.

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A new alkyd paint anticorrosion smart coating was developed by using silica nanoparticles as corrosion inhibitor nanocontainers. Silica particles were mixed with the paint at different concentrations to study their performance and ensure their free transportation to the damaged metal. The filling up of silica particles was done preparing three solutions: distilled water, acetone, and a mixture of both, with Fe(NO3)3and silica particles immersed in each of the solutions to adsorb the inhibitor. Acetone solution was the best alternative determined by weight gain analysis made with the inhibitor adsorbed in silica nanocontainers. Steel samples were painted with inhibitor silica nanocontainer coatings and immersed in an aqueous solution of 3% sodium chloride. Polarization curves and electrochemical noise techniques were used to evaluate the corrosion inhibitor system behavior. Good performance was obtained in comparison with samples without inhibitor nanocontainer coating.
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10

Song, Xiang-Yun, Wanqing Cao, Michael R. Ayers y Arlon J. Hunt. "Carbon nanostructures in silica aerogel composites". Journal of Materials Research 10, n.º 2 (febrero de 1995): 251–54. http://dx.doi.org/10.1557/jmr.1995.0251.

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A new method of preparing carbon nanotubes and their derivatives using silica aerogels as a matrix for the deposition of carbon is repeated. We present results of observations of graphite tubes and rings including nested structures in nanometer dimensions using high resolution transmission electron microscopy. Furthermore, we propose a model for the growth of carbon nanotubes in three steps including nucleation, growth, and closure of tubes.
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11

Clément, R. y S. Douady. "Ocean-ridge-like growth in silica tubes". EPL (Europhysics Letters) 89, n.º 4 (1 de febrero de 2010): 44004. http://dx.doi.org/10.1209/0295-5075/89/44004.

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12

Pagano, Jason J., Stephanie Thouvenel-Romans y Oliver Steinbock. "Compositional analysis of copper–silica precipitation tubes". Phys. Chem. Chem. Phys. 9, n.º 1 (2007): 110–16. http://dx.doi.org/10.1039/b612982j.

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13

Roszol, Laszlo, Rabih Makki y Oliver Steinbock. "Postsynthetic processing of copper hydroxide-silica tubes". Chemical Communications 49, n.º 51 (2013): 5736. http://dx.doi.org/10.1039/c3cc41516c.

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14

Goedert, James L., Jörn Peckmann y Joachim Reitner. "Worm tubes in an allochthonous cold-seep carbonate from lower Oligocene rocks of western Washington". Journal of Paleontology 74, n.º 6 (noviembre de 2000): 992–99. http://dx.doi.org/10.1017/s002233600001756x.

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Tubes suspected to be those of vestimentiferan worms are abundant in carbonate boulders at one locality in the lower Oligocene part of the Lincoln Creek Formation along the Canyon River, Grays Harbor County, Washington. The largest tubes exhibit the same general orientation and are arranged in clusters. The tube walls are preserved as aragonite that is, in some cases, replaced by silica. The original tube walls either had a high carbonate content or were indurated very early by aragonite mineralization of the organic wall. The carbonate cements around, on, and inside of the tubes were precipitated due to the microbial oxidation of hydrocarbons at a cold-seep. After lithification, the carbonate fragmented as it slid or slumped, along with other sedimentary debris, downslope into deeper waters. This is one of the few reports of an ancient cold-seep chemosynthetic community dominated by tube worms, and the third report of an allochthonous cold-seep carbonate within a deep-water depositional setting.
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15

Gurylev, V., C. C. Wang, Y. C. Hsueh y T. P. Perng. "Growth of silica nanowires in vacuum". CrystEngComm 17, n.º 11 (2015): 2406–12. http://dx.doi.org/10.1039/c4ce02538e.

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16

Brimacombe, J. "The Incendiary Characteristics of the Laryngeal and Reinforced Laryngeal Mask Airway to CO2 Laser Strike—A Comparison with Two Polyvinyl Chloride Tracheal Tubes". Anaesthesia and Intensive Care 22, n.º 6 (diciembre de 1994): 694–97. http://dx.doi.org/10.1177/0310057x9402200609.

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The incendiary characteristics of the laryngeal and reinforced laryngeal mask airway to the CO2 laser have been compared with two polyvinyl chloride tracheal tubes. Three different power densities (2.35, 4.7 and 9.8 × 103 watt/cm2) were used, with either oxygen or a 30% oxygen/70% nitrous oxide mixture flowing down the tube. The laryngeal mask airway (and reinforced model) was shown to be more resistant than the polyvinyl chloride tracheal tubes. The laryngeal mask tube could not be ignited at a power density of 2.25 × 103 watt/cm2 after five minutes, although penetration occurred in 20-30 seconds. A layer of silica ash built up at the impact site and protected the underlying tube. The laryngeal mask airway cuff was penetrated at 3 to 5 seconds. At this power density the polyvinyl chloride tube ignited in 2 to 8 seconds and the cuff was penetrated in 0.1 seconds. At the highest power density the tubes of all airways ignited within 0.2 seconds. The possibilities for improving the incendiary characteristics of the laryngeal mask airway are discussed.
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17

Petranovskii, Vitalii, Miguel Ángel Hernández Espinosa, Ekaterina Kolobova y Alexey Pestryakov. "Transport of Reactants in Ultrathin Channels during the Etching Reaction". Advanced Materials Research 1040 (septiembre de 2014): 202–7. http://dx.doi.org/10.4028/www.scientific.net/amr.1040.202.

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By selective acid leaching, silica nanotubes were prepared from the natural mineral chrysotile asbestos. These one-dimensional tube actually represent a convolution of twodimensional layers, and the subsequent stacking the tubes into a hexagonal assembly generates three-dimensional body. Made materials are acid-and heat-resistant and can be used as feedstock in the manufacture of filters, or as matrices for the synthesis of nanomaterials.
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18

Thouvenel-Romans, Stephanie y Oliver Steinbock. "Oscillatory Growth of Silica Tubes in Chemical Gardens". Journal of the American Chemical Society 125, n.º 14 (abril de 2003): 4338–41. http://dx.doi.org/10.1021/ja0298343.

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19

Gautier, Clémentine, Pascal J. Lopez, Miryana Hemadi, Jacques Livage y Thibaud Coradin. "Biomimetic Growth of Silica Tubes in Confined Media". Langmuir 22, n.º 22 (octubre de 2006): 9092–95. http://dx.doi.org/10.1021/la061674b.

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20

Albertí, Sebastián, Juan Imperial, Juan M. Tomás y Vicente J. Benedí. "Bacterial lipopolysaccharide extraction in silica gel-containing tubes". Journal of Microbiological Methods 14, n.º 1 (septiembre de 1991): 63–69. http://dx.doi.org/10.1016/0167-7012(91)90008-e.

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21

MacChesney, J. B., D. W. Johnson, S. Bhandarkar, M. P. Bohrer, J. W. Fleming, E. M. Monberg y D. J. Trevor. "Optical fibres using sol-gel silica overcladding tubes". Electronics Letters 33, n.º 18 (1997): 1573. http://dx.doi.org/10.1049/el:19971026.

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22

Nakamura, Hidenori y Yasushi Matsui. "The preparation of novel silica gel hollow tubes". Advanced Materials 7, n.º 10 (octubre de 1995): 871–72. http://dx.doi.org/10.1002/adma.19950071013.

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23

Mori, T., M. Toki, M. Ikejiri, M. Takei, M. Aoki, S. Uchiyama y S. Kanbe. "Silica glass tubes by new sol-gel method". Journal of Non-Crystalline Solids 100, n.º 1-3 (marzo de 1988): 523–25. http://dx.doi.org/10.1016/0022-3093(88)90076-2.

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24

Glaab, F., J. Rieder, J. M. García-Ruiz, W. Kunz y M. Kellermeier. "Diffusion and precipitation processes in iron-based silica gardens". Physical Chemistry Chemical Physics 18, n.º 36 (2016): 24850–58. http://dx.doi.org/10.1039/c6cp02107g.

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25

An, Weiqing, Xiangan Yue, Jirui Zou, Lijuan Zhang, Yu-Chun Fu y Rongjie Yan. "A Form of Non-Volatile Solid-like Hexadecane Found in Micron-Scale Silica Microtubule". Materials 16, n.º 1 (20 de diciembre de 2022): 9. http://dx.doi.org/10.3390/ma16010009.

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Anomalous solid-like liquids at the solid–liquid interface have been recently reported. The mechanistic factors contributing to these anomalous liquids and whether they can stably exist at high vacuum are interesting, yet unexplored, questions. In this paper, thin slices of silica tubes soaked in hexadecane were observed under a transmission electron microscope at room temperature. The H-spectrum of hexadecane in the microtubules was measured by nuclear magnetic resonance. On the interior surface of these silica tubes, 0.2–30 μm in inside diameter (ID), a layer (12–400 nm) of a type of non-volatile hexadecane was found with thickness inversely correlated with the tube ID. A sample of this anomalous hexadecane in microtubules 0.4 μm in ID was found to be formable by an ion beam. Compared with the nuclear magnetic resonance H-spectroscopy of conventional hexadecane, the characteristic peaks of this abnormal hexadecane were shifted to the high field with a broader characteristic peak, nuclear magnetic resonance hydrogen spectroscopy spectral features typical of that of solids. The surface density of these abnormal hexadecanes was found to be positively correlated with the silanol groups found on the interior silica microtubular surface. This positive correlation indicates that the high-density aggregation of silanol is an essential factor for forming the abnormal hexadecane reported in this paper.
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26

Wan, Ye, Xiaolin Wang, I.-Ming Chou, Wenxuan Hu, Yang Zhang y Xiaoyu Wang. "An Experimental Study of the Formation of Talc through CaMg(CO3)2–SiO2–H2O Interaction at 100–200°C and Vapor-Saturation Pressures". Geofluids 2017 (2017): 1–14. http://dx.doi.org/10.1155/2017/3942826.

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The metamorphic interaction between carbonate and silica-rich fluid is common in geological environments. The formation of talc from dolomite and silica-rich fluid occurs at low temperatures in the metamorphism of the CaO–MgO–SiO2–CO2–H2O system and plays important roles in the formation of economically viable talc deposits, the modification of dolomite reservoirs, and other geological processes. However, disagreement remains over the conditions of talc formation at low temperatures. In this study, in situ Raman spectroscopy, quenched scanning electron microscopy, micro-X-ray diffraction, and thermodynamic calculations were used to explore the interplay between dolomite and silica-rich fluids at relatively low temperatures in fused silica tubes. Results showed that talc formed at ≤200°C and low CO2partial pressures (PCO2). The reaction rate increased with increasing temperature and decreased with increasingPCO2. The major contributions of this study are as follows:(1)we confirmed the formation mechanism of Mg-carbonate-hosted talc deposits and proved that talc can form at ≤200°C;(2)the presence of talc in carbonate reservoirs can indicate the activity of silica-rich hydrothermal fluids; and (3) the reactivity and solubility of silica require further consideration, when a fused silica tube is used as the reactor in highP–Texperiments.
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27

Chen, Hong Liang, Ji Song Yang, Yan Wang, Hui Ying Li, Xin Xin Li y Wei Shen Yang. "Preparation of Silicalite-1 Membranes with Seeding Method and its Separation Performance for Low Ethanol/Water Mixture". Advanced Materials Research 807-809 (septiembre de 2013): 591–95. http://dx.doi.org/10.4028/www.scientific.net/amr.807-809.591.

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High performance silicalite-1 membranes were successfully synthesized on silica tubes by seeding method after filling the tubes with water and glycerol mixtures. After seeding the silica tubes with 200 nm seeds, all the silicalite-1 membranes show acceptable separation performance towards ethanol/water mixture after 4-12 h hydrothermal synthesis, and the highest flux of membrane with 8 h hydrothermal synthesis reaches about 0.98 kg/m2.h and the separation factor reaches about 60 towards 3 wt.% ethanol/water mixture. This result shows that the as-synthesized silicalite-1 membrane can concentrate the ethanol from 3% to about 65%, and the ethanol can be obtained over 600 g/m2.h by using the silicalite-1 membrane, which shows that seeding method and suitable control of synthesis conditions is possible for preparing high-performance silicalite-1 membranes.
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28

Aravind, D. y P. Srinivasa Rao. "Influence of nano particles on the properties of concrete: A state of art review". YMER Digital 21, n.º 07 (29 de julio de 2022): 1248–61. http://dx.doi.org/10.37896/ymer21.07/a4.

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Use of nanomaterials such as nano-silica, nano-alumina, nano-iron oxide, nano titanium oxide, nano carbon tubes etc., in concrete has been extensively studied in recent years. By adding nanomaterials of size 0.1 nm to 100 nm having greater surface area improves the microstructure by reducing the voids and making the matrix denser. Nanomaterials improve the mechanical and durability properties of concrete. Nano materials expected to play an important role in future in the modern concrete infrastructure. This paper will give a brief review about the influence of nanoparticles on the properties of concrete. Key words: Nano-Silica, Nano-Alumina, Nano-Iron oxide, Nano-titanium oxide, Nano carbon tubes.
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29

Lu, Yaning, Shuling Zhang, Zhi Geng, Yinlong Du, Kai Zhu, Yonggang Li y Guibin Wang. "Design and preparation of silica tube/poly(aryl ether ketone) composites with low dielectric constant". RSC Advances 6, n.º 77 (2016): 72999–3005. http://dx.doi.org/10.1039/c6ra13855a.

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30

Süzer, Ş., N. Ertaş, S. Kumser y O. Y. Ataman. "X-ray Photoelectron Spectroscopic Characterization of Au Collected with Atom Trapping on Silica for Atomic Absorption Spectrometry". Applied Spectroscopy 51, n.º 10 (octubre de 1997): 1537–39. http://dx.doi.org/10.1366/0003702971939064.

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The nature of analyte species collected on a cooled silica tube for atom-trapping atomic absorption spectrometric determination was investigated with the use of X-ray photoelctron spectroscopy (XPS). An XPS spectrum of gold deposited on atom-trapping silica tubes reveals a Au 4f7/2 peak with a binding energy of 84.8 (±0.2) eV, which falls in the middle of the binding energies corresponding to zerovalent Au(0) at 84.0 eV and that of monovalent Au(I) at 85.2 eV. The corresponding energy for Au vapor deposited on silica is also 84.8 eV. Deposition of AuCl4- solution on silica results in two different Au 4f7/2 peaks with binding energies of 84.8 and 87.3 eV corresponding, respectively, to Au(0) and Au(III). Deposition of the same AuCl4- solution on platinum metal again gives two peaks, this time at 84.4 and 87.0 eV energies corresponding again to Au(0) and Au(III). Combining all these data, we conclude that gold is trapped on atom-trapping silica surface as zerovalent Au(0) with a 0.8-eV matrix shift with respect to the metal surface. A similar 0.6-eV shift is also observed between the binding energy of 4f7/2Hg22+ measured in Hg2(NO3)2·2H2O powder and that deposited on silica.
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31

Srinivasan, U., I. Homma, C. M. Chun, D. M. Dabbs, D. A. Hajduk, S. M. Gruner y I. A. Aksay. "Nanocomposite processing via infiltration of mesoporous silica". Proceedings, annual meeting, Electron Microscopy Society of America 53 (13 de agosto de 1995): 212–13. http://dx.doi.org/10.1017/s0424820100137434.

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Synthesis of materials with nanoscale (1~100 nm) organization is important in various applications. Recently, scientists at Mobil described a new family of mesoporous molecular sieves. These materials have regular arrays of uniform pore channels ranging from 1.6~10 nm in diameter in contrast to other mesoporous solids such as amorphous silicas and modified layered clays and silicates. A surfactantsilicate co-assembly model has been proposed to explain the formation of these materials. According to this pathway, the matching of the charge density at the organic-inorganic interface controls the assembly of the mesophases and four distinct silica mesophases have been observed, lamellae, hexagonally packed tubes, and two bicontinuous structures of cubic symmetry. Different phases are constructed by varying the synthesis parameters such as the surfactant/silicate ratio and the acidity. Here, we report the synthesis of a new amorphous mesoporous phase with short range order and with no long range crystallinity. Due to its interpenetrating network structure, this amorphous mesoporous silica can be used as a matrix for nanocomposite processing. Here, we use it as a host to process ruby glass.
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32

Buyukserin, F., S. Altuntas y B. Aslim. "Fabrication and modification of composite silica nano test tubes for targeted drug delivery". RSC Adv. 4, n.º 45 (2014): 23535–39. http://dx.doi.org/10.1039/c4ra00871e.

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33

Zhang, Yihe, Yuanqing Li, Guangtao Li, Haitao Huang, H. L. W. Chan, Walid A. Daoud, John H. Xin y Laifeng Li. "Polyimide-Surface-Modified Silica Tubes: Preparation and Cryogenic Properties". Chemistry of Materials 19, n.º 8 (abril de 2007): 1939–45. http://dx.doi.org/10.1021/cm062540m.

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34

Li, Nan, Xiaotian Li, Wei Wang y Shilun Qiu. "Mesoporous silica tubes fabricated with human hair as template". Materials Chemistry and Physics 91, n.º 1 (mayo de 2005): 223–26. http://dx.doi.org/10.1016/j.matchemphys.2004.11.016.

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35

De, G., D. Kundu, B. Karmakar y D. Ganguli. "Transparent silica gel tubes by the sol-gel process". Journal of Materials Science Letters 12, n.º 9 (1993): 654–55. http://dx.doi.org/10.1007/bf00465581.

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36

Kirchhof, Johannes y Sonja Unger. "Viscous behavior of synthetic silica glass tubes during collapsing". Optical Materials Express 7, n.º 2 (9 de enero de 2017): 386. http://dx.doi.org/10.1364/ome.7.000386.

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37

Liang, Zhijian y Andrei S. Susha. "Mesostructured Silica Tubes and Rods by Templating Porous Membranes". Chemistry - A European Journal 10, n.º 19 (4 de octubre de 2004): 4910–14. http://dx.doi.org/10.1002/chem.200400005.

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38

Schneider, Jörg J. y Meike Naumann. "Template-directed synthesis and characterization of microstructured ceramic Ce/ZrO2@SiO2 composite tubes". Beilstein Journal of Nanotechnology 5 (25 de julio de 2014): 1152–59. http://dx.doi.org/10.3762/bjnano.5.126.

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An exo-templating synthesis process using polymeric fibers and inorganic sol particles deposited onto structured one-dimensional objects is presented. In particular, CeO2/ZrO2@SiO2 composite tubes were synthesized in a two-step procedure by using electrospun polystyrene fibers as fiber template. First, a sol–gel approach based on an exo-templating technique was employed to obtain polystyrene(PS)/SiO2 composite fibers. These composite fibers were subsequently covered by spray-coating with ceria and zirconia sol solutions. After drying and final calcination of the green body composites, the PS polymer template was removed, and composite tubes of the composition CeO2/ZrO2@SiO2 were obtained. The SiO2/ZrO2/CeO2 microtubes, which consist of interconnected silica particles, are held together by ceria and zirconia deposits formed during the thermal treatment process. These microtubes are mainly located in the pendentive connecting the individual spherical silica particles and glue them together. The composition and crystallinity of this material connecting the individual silica particles contains the elements Ce and Zr and O as mixed oxide solid solution identified by XRD, Raman and high-resolution TEM and EFTEM. High-resolution microscopy techniques allowed for an elemental mapping on the surface of the silica host structure and determination of the O, Zr and Ce elemental distribution with nm precision.
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39

Saggese, S. J., J. A. Harrington, G. H. Sigel, R. Altkorn y R. Haidle. "Novel Lightpipes for Infrared Spectroscopy". Applied Spectroscopy 46, n.º 7 (julio de 1992): 1194–97. http://dx.doi.org/10.1366/0003702924124060.

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The fabrication and temperature-dependent mid-infrared transmission characteristics of gold-on-nickel, silver-on-nickel, silica, and sapphire hollow lightpipes are discussed. The metal tubes offer improved low-temperature transmission and more versatile fabrication methods than do conventional FT-IR lightpipes. The dielectric tubes offer extremely low loss in certain spectral regions, outstanding high-temperature performance, and, in some cases, sufficiently low cost to be considered disposable.
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40

Pervadchuk, Vladimir, Daria Vladimirova, Irina Gordeeva, Alex G. Kuchumov y Dmitrij Dektyarev. "Fabrication of Silica Optical Fibers: Optimal Control Problem Solution". Fibers 9, n.º 12 (29 de noviembre de 2021): 77. http://dx.doi.org/10.3390/fib9120077.

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In this work, a new approach to solving problems of optimal control of manufacture procedures for the production of silica optical fiber are proposed. The procedure of silica tubes alloying by the Modified Chemical Vapor Deposition (MCVD) method and optical fiber drawing from a preform are considered. The problems of optimal control are presented as problems of controlling distributed systems with objective functionals and controls of different types. Two problems are formulated and solved. The first of them is the problem of the temperature field optimizing in the silica tubes alloying process in controlling the consumption of the oxygen–hydrogen gas mixture (in the one- and two-dimensional statements), the second problem is the geometric optimization of fiber shape in controlling the drawing velocity of the finished fiber. In both problems, while using an analog to the method of Lagrange, the optimality systems in the form of differential problems in partial derivatives are obtained, as well as formulas for finding the optimal control functions in an explicit form. To acquire optimality systems, the qualities of lower semicontinuity, convexity, and objective functional coercivity are applied. The numerical realization of the obtained systems is conducted by using Comsol Multiphysics.
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41

Zhou, Bing, Jiangong Zhang, Xin Li y Bilong Liu. "An Investigation on the Sound Absorption Performance of Granular Molecular Sieves under Room Temperature and Pressure". Materials 13, n.º 8 (20 de abril de 2020): 1936. http://dx.doi.org/10.3390/ma13081936.

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The sound absorption of granular silica-aluminate molecular sieve pellets was investigated in this paper. The absorption coefficients of molecular sieve pellets with different pore sizes, pellet sizes, and layer thicknesses were measured through impedance tubes under room temperature and pressure conditions. The effects of pore size, pellet size, layer thickness were compared and explained. The comparisons show that at room temperature and pressure, the sound absorption of molecular sieve pellets is not a result of the crystalline structure, but rather it mainly changes with the pellet size and layer thickness. In addition, the five non-acoustical parameters of molecular sieve pellets were obtained by an inverse characterization method based on impedance tube measurements. The measurement by impedance tubes is in good agreement with the calculation of Johnson-Champoux-Allard (JCA) model, proving that the JCA model can be effectively used to predict the sound absorption of molecular sieve pellets.
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42

Batista, Bruno C. y Oliver Steinbock. "Chemical gardens without silica: the formation of pure metal hydroxide tubes". Chemical Communications 51, n.º 65 (2015): 12962–65. http://dx.doi.org/10.1039/c5cc04724b.

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43

Chiera, N. M., R. Eichler, A. Vögele y A. Türler. "Vapor deposition coating of fused silica tubes with amorphous selenium". Thin Solid Films 592 (octubre de 2015): 8–13. http://dx.doi.org/10.1016/j.tsf.2015.08.043.

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44

Pesek, Joseph J. y Maria T. Matyska. "Open tubular capillary electrokinetic chromatography in etched fused-silica tubes". Journal of Chromatography A 887, n.º 1-2 (julio de 2000): 31–41. http://dx.doi.org/10.1016/s0021-9673(00)00180-1.

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45

Knox, J. H. y I. H. Grant. "Electrochromatography in packed tubes using 1.5 to 50 μm silica gels and ODS bonded silica gels". Chromatographia 32, n.º 7-8 (octubre de 1991): 317–28. http://dx.doi.org/10.1007/bf02321428.

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46

Lefèvre, Robin, David Berthebaud, Oleg Lebedev, Olivier Pérez, Célia Castro, Stéphanie Gascoin, Daniel Chateigner y Franck Gascoin. "Layered tellurides: stacking faults induce low thermal conductivity in the new In2Ge2Te6 and thermoelectric properties of related compounds". Journal of Materials Chemistry A 5, n.º 36 (2017): 19406–15. http://dx.doi.org/10.1039/c7ta04810f.

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A new ternary layered compound In2Ge2Te6, belonging to the hexatellurogermanate family has been synthesized from the reaction of appropriate amounts of the pure elements at high temperature in sealed silica tubes.
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47

Jan, Jeng Shiung, Po Jui Chen y Yu Han Ho. "Synthesis of Gold Nanoparticle/Silica Nanostructures". Materials Science Forum 688 (junio de 2011): 321–25. http://dx.doi.org/10.4028/www.scientific.net/msf.688.321.

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A novel approach is proposed to prepare organic-inorganic composite tubular structure by mineralizing silica and/or gold nanoparticle in the LbL assembled polypeptide multilayers films. Mesoporous silica (m-SiO2) and gold nanoparticle/mesoporous silica (Au NP/m-SiO2) tubes were prepared by subsequent calcination. The LbL assembled poly-L-lysine (PLL)/poly-L-tyrosine (PLT) multilayer film within the inner pores of polycarbonate templates acts as both a mineralizing agent and template for the formation of these materials. The as-prepared mesoporous SiO2and Au NP/m-SiO2tubes have well-defined structures. Gold nanoparticles with size smaller than 8 nm were immobilized in the silica network and the as-prepared Au NP/m-SiO2tubes exhibit good catalytic activity towards the reduction of p-nitrophenol. This approach may provide a facile and general method to synthesize organic-inorganic and metal-oxide nanocomposites with different composition and structures.
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48

CASSINELLI, MARY ELLEN. "Laboratory Evaluation of Silica Gel Sorbent Tubes for Sampling Hydrogen Fluoride". American Industrial Hygiene Association Journal 47, n.º 4 (abril de 1986): 219–24. http://dx.doi.org/10.1080/15298668691389658.

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49

Bergh, Arne K. "Observations on ToxTrap Silica Gel Breath Capture Tubes for Alcohol Analysis". Journal of Forensic Sciences 30, n.º 1 (1 de enero de 1985): 10980J. http://dx.doi.org/10.1520/jfs10980j.

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50

Schmiesing, Nickolas C., Giancarlo Corti y Andrew D. Sommers. "Water Condensation and Droplet Shedding Behavior on Silica-Nanospring-Coated Tubes". ACS Applied Materials & Interfaces 12, n.º 14 (17 de marzo de 2020): 17046–54. http://dx.doi.org/10.1021/acsami.9b23148.

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