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Journal articles on the topic 'SILICA SYSTEMS'

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Author: Grafiati

Published: 1 April 2023

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1

Caponi, S., P. Benassi, R. Eramo, A. Giugni, M. Nardone, A. Fontana, M. Sampoli, F. Terki, and T. Woignier. "Phonon attenuation in vitreous silica and silica porous systems." Philosophical Magazine 84, no. 13-16 (May 2004): 1423–31. http://dx.doi.org/10.1080/14786430310001644170.

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2

Shchukin, D. G., D. V. Sviridov, and A. I. Kulak. "Magnetorheological photocatalytic systems." International Journal of Photoenergy 1, no. 2 (1999): 65–67. http://dx.doi.org/10.1155/s1110662x99000124.

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Preparation and properties of a novel photocatalytic system containing magnetic cores coated with subsequently applied silica and titania shells are discussed. The underlying idea is to impart magnetic properties to the semiconductor particles that permits to control the rheological properties of the photocatalyst dispersion and makes possible its separation from treated solution without invoking procedures of filtration or centrifugation. Preparation route yielding photoactive titania coating and silica interlayer, which prevents the undesirable doping of catalyst and parasitic charge exchange between titania shell and magnetic core, is described in detail.

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3

Caponi, S., A. Fontana, M. Montagna, O. Pilla, F. Rossi, F. Terki, and T. Woignier. "Acoustic attenuation in silica porous systems." Journal of Non-Crystalline Solids 322, no. 1-3 (July 2003): 29–34. http://dx.doi.org/10.1016/s0022-3093(03)00167-4.

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4

Carvalho, A., P. J. Sebastião, I. Fonseca, J. Matos, and M. Clara Gonçalves. "Silica and silica organically modified nanoparticles: Water dynamics in complex systems." Microporous and Mesoporous Materials 217 (November 2015): 102–8. http://dx.doi.org/10.1016/j.micromeso.2015.06.015.

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5

Weng, Peter F. "Silica scale inhibition and colloidal silica dispersion for reverse osmosis systems." Desalination 103, no. 1-2 (November 1995): 59–67. http://dx.doi.org/10.1016/0011-9164(95)00087-9.

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6

Salimian, S., A. Zadhoush, and A. Mohammadi. "A review on new mesostructured composite materials: Part I. synthesis of polymer-mesoporous silica nanocomposite." Journal of Reinforced Plastics and Composites 37, no. 7 (January 10, 2018): 441–59. http://dx.doi.org/10.1177/0731684417752081.

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Mesoporous silicas are inorganic materials with large surface areas, uniform framework structures and readily controlled pore diameters which are synthesized in the presence of surfactants as structure-directing agents, followed by the removal of the surfactant by extraction or calcination. Due to their characteristics, such as ordered structure, high surface area, and favorable interfacial interactions between silica surface and the polymer, they have found excellent potential application for use as reinforcing agents for several engineering polymer systems. While a large number of different synthesis approaches for the preparation of mesoporous silica-polymer nanocomposites has been reported in literature, there is nevertheless a growing need for verified synthesis methods of mesoporous silica-polymer materials. This paper presents a review of the literature on the methods for synthesizing polymer-mesoporous silica nanocomposites and discusses some unique properties of these composites.

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7

Phoenix, Vernon R., Kurt O. Konhauser, and F. Grant Ferris. "Experimental study of iron and silica immobilization by bacteria in mixed Fe-Si systems: implications for microbial silicification in hot springs." Canadian Journal of Earth Sciences 40, no. 11 (November 1, 2003): 1669–78. http://dx.doi.org/10.1139/e03-044.

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The immobilization of silica and iron by the bacteria Bacillus subtilis was monitored in controlled microcosms to elucidate the role iron may play in aiding bacterial silicification in hot springs. Silica and iron immobilization was monitored as a function of bacterial concentration, iron concentration, and silica concentration (both undersaturated and oversaturated with respect to amorphous silica). Results demonstrate that bacterial cells do immobilize more Fe than bacteria-free systems in solutions with iron concentrations [Formula: see text]50 ppm Fe. However, as iron concentrations increase, the difference between Fe immobilization in bacterial and bacteria-free systems decreases as non-bacterially mediated precipitation processes dominate. Additionally, bacterial systems that had immobilized more Fe compared with bacteria-free systems did not immobilize more silica than bacteria-free systems. By comparing molar ratios of (silica in solution)/(bacterially bound Fe), it is evident that insufficient iron is bound to the bacterial surface to act as an effective salt bridge for silica sorption. This appears to be because much of the iron is immobilized by non-bacterially mediated precipitation of phases such as Fe(OH)3 and poorly ordered hydrous iron silicates. It follows that in silica-enriched hot springs, silica and iron immobilization processes are significantly dominated by non-bacterially mediated precipitation. Any bacterially mediated processes are exceedingly small and outside the resolution of these experiments.

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8

Komiyama, Masaharu, and Manabu Kirino. "First STM Observation of Silica and Platinum-on-Silica Model Catalyst Systems." Chemistry Letters 21, no. 12 (December 1992): 2301–2. http://dx.doi.org/10.1246/cl.1992.2301.

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9

Godoi, R. H. M., L. Fernandes, M. Jafelicci Jr, R. C. Marques, L. C. Varanda, and M. R. Davolos. "Investigation of the systems silica and silica containing chromium in alcohol medium." Journal of Non-Crystalline Solids 247, no. 1-3 (June 1999): 141–45. http://dx.doi.org/10.1016/s0022-3093(99)00052-6.

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10

Nowacka, Magdalena, Łukasz Klapiszewski, Małgorzata Norman, and Teofil Jesionowski. "Dispersive evaluation and surface chemistry of advanced, multifunctional silica/lignin hybrid biomaterials." Open Chemistry 11, no. 11 (November 1, 2013): 1860–73. http://dx.doi.org/10.2478/s11532-013-0322-4.

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AbstractAdvanced silica/lignin hybrid biomaterials were obtained using hydrated or fumed silicas (Aerosil®200) and Kraft lignin as precursors, which is a cheap and biodegradable natural polymer. To extend the possible range of applications, the silicas were first modified with N-2-(aminoethyl)-3-aminopropyltrimethoxsysilane, and then with Kraft lignin, which had been oxidized with sodium periodate. The SiO2/lignin hybrids and precursors were characterised by means of determination of their physicochemical and dispersive-morphological properties. The effectiveness of silica binding to lignin was verified by FT-IR spectroscopy. The zeta potential value provides relevant information regarding interactions between colloid particles. Measurement of the zeta potential values enabled an indirect assessment of stability for the studied hybrid systems. Determination of zeta potential and density of surface charge also permitted the quantitative analysis of changes in surface charge, and indirectly confirmed the effectiveness of the proposed method for synthesis of SiO2/lignin hybrid materials. A particularly attractive feature for practical use is their stability, especially electrokinetic stability. It is expected that silica/lignin hybrids will find a wide range of applications (polymer fillers, biosorbents, electrochemical sensors), as they combine the unique properties of silica with the specific structural features of lignin. This makes these hybrids biomaterials advanced and multifunctional.

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11

Perng, Yuan-Shing, Eugene I.-Chen Wang, Chih-Kai Chang, and Chih-Ping Chang. "Nanosericite as an Innovative Microparticle in Dual-Chemical Paper Retention Systems." Advances in Materials Science and Engineering 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/536961.

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Dual-chemical retention systems based on 2 cationic polyacrylamides, a colloidal silica, and a globular anionic polymer microparticles were investigated and an exfoliated nanoparticle indigenous mica mineral, sericite, was examined for its efficacy in substituting commercial microparticle preparations. The results indicated that nanosericite generated FPR between 76.9 and 80.9% for fines and chemicals. Its ash retention values, however, were higher and tended to increase with doses of polymer, nanosericite, or Sc to between 16 and 24%. As for paper physical properties, nanosericite was not amenable to substitute the c-PAMb/polymer with only handsheet stiffness superior to the combination. Nanosericite, however, showed good substitution capacity than the c-PAMa-colloidal silica combination. Regardless of the c-PAMa doses, all examined handsheet physical properties incorporating nanosericite were superior to colloidal silica. The optimal performance was observed with c-PAMa dose of 200 ppm. Optical properties of the handsheets indicated that with nanosericite substitution, brightness values were comparable to the polymer group, while its substitution capacity for colloidal silica decreased with increasing c-PAMb dose. Only at c-PAMa dose of 300 ppm, it appeared to have good substitution for colloidal silica. Substituting nanosericite for colloidal silica appeared to reduce the c-PAMa charge and increased the overall cost effectiveness.

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12

Nastase, Silviu, Laura Bajenaru, Daniela Berger, Cristian Matei, Mihaela Moisescu, Doru Constantin, and Tudor Savopol. "Mesostructured silica matrix for irinotecan delivery systems." Open Chemistry 12, no. 8 (August 1, 2014): 813–20. http://dx.doi.org/10.2478/s11532-014-0501-y.

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AbstractThree mesostructured silica-type carriers, MCM-41 and MCM-41 functionalized by a postsynthesis grafting procedure with hydrophilic aminopropyl groups (MCM-APTES) and hydrophobic vinyl moieties (MCM-VTES), respectively, were investigated in order to elaborate drug delivery systems (DDS) for irinotecan molecules. All studied drug delivery systems exhibited higher cytotoxicity on murine embrionary fibroblastic (MEF) cells than free irinotecan at the same content of the cytostatic agent, whereas no toxicity was observed for the three unloaded carriers. The cytotoxic effect of irinotecan loaded on MCM-41-type carriers continued to increase even 24 h after ceasing the cell exposure to the drug and remained significantly higher than that of free irinotecan. The cellular uptake of silica-type hybrids was investigated by labelling MCM-APTES with Rhodamine B. In the case of the studied DDS, an endocytotic mechanism was found to be involved in the cell uptake process, and it was used to explain the cytotoxicity differences between free irinotecan and drug loaded on MCM-41-type supports.

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13

Darder, Margarita, Pilar Aranda, Laura Burgos-Asperilla, Andreu Llobera, Víctor J. Cadarso, César Fernández-Sánchez, and Eduardo Ruiz-Hitzky. "Algae–silica systems as functional hybrid materials." J. Mater. Chem. 20, no. 42 (2010): 9362–69. http://dx.doi.org/10.1039/b913269d.

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14

MacElroy, J. M. D. "Sorption in energetically heterogeneous model silica systems." Langmuir 9, no. 10 (October 1993): 2682–92. http://dx.doi.org/10.1021/la00034a031.

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15

Chakraborty, Anutosh, Bidyut Baran Saha, Shigeru Koyama, Kim Choon Ng, and Kandadai Srinivasan. "Adsorption Thermodynamics of Silica Gel−Water Systems†." Journal of Chemical & Engineering Data 54, no. 2 (February 12, 2009): 448–52. http://dx.doi.org/10.1021/je800458k.

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16

Chua, Hui T., Kim C. Ng, Anutosh Chakraborty, Nay M. Oo, and Mohamed A. Othman. "Adsorption Characteristics of Silica Gel + Water Systems." Journal of Chemical & Engineering Data 47, no. 5 (September 2002): 1177–81. http://dx.doi.org/10.1021/je0255067.

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17

Go, Tatsuo, Nobuyasu Kato, Osamu Sakaguchi, Munetaka Honda, and Kunio Kato. "Process Systems Engineering. Production of Fused Silica." KAGAKU KOGAKU RONBUNSHU 22, no. 5 (1996): 1207–13. http://dx.doi.org/10.1252/kakoronbunshu.22.1207.

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18

Jesionowski, Teofil. "Preparation of Silica Particles in Emulsion Systems." Journal of Dispersion Science and Technology 22, no. 4 (2001): 363–71. http://dx.doi.org/10.1081/dis-100106941.

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19

Berardi, Umberto. "Development of Glazing Systems with Silica Aerogel." Energy Procedia 78 (November 2015): 394–99. http://dx.doi.org/10.1016/j.egypro.2015.11.682.

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20

Ghedini, E., M. Signoretto, F. Pinna, and G. Cruciani. "Mesoporous Silica–Zirconia Systems for Catalytic Applications." Catalysis Letters 125, no. 3-4 (September 13, 2008): 359–70. http://dx.doi.org/10.1007/s10562-008-9459-8.

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21

Perez, Roman A., Rajendra K. Singh, Tae-Hyun Kim, and Hae-Won Kim. "Silica-based multifunctional nanodelivery systems toward regenerative medicine." Materials Horizons 4, no. 5 (2017): 772–99. http://dx.doi.org/10.1039/c7mh00017k.

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22

SVATOVSKAYA, L. B. "SILICA SOL APPLICATION IN GEOCONSTRUCTION." Periódico Tchê Química 16, no. 31 (January 20, 2019): 711–18. http://dx.doi.org/10.52571/ptq.v16.n31.2019.722_periodico31_pgs_711_718.pdf.

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The article deals with a number of topical issues connected with transport geoconstruction and environmental pollution such as heavy metal ion pollutions of soils. The main aim of the study is to present new problem solutions and technologies for geoconstruction concerning pure substance use for lithosphere. Silica sol solution was chosen as this substance. The choice was made because of silica sol nature. Having important properties, it is the purest substance for the environment. Experimental methods were carried out. The study introduces new technologies of silica sol solution use in geoconstruction systems: silica sol detoxication technology (SDT) for soils, silica sol absorption technology (SAT), soil strengthening technology (SST), silica sol blocking action technology (SBT). The article shows the examples of these technologies’ application and examines new main properties of geoconstruction systems.

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23

Czarnobaj, Katarzyna, Magdalena Prokopowicz, and Katarzyna Greber. "Use of Materials Based on Polymeric Silica as Bone-Targeted Drug Delivery Systems for Metronidazole." International Journal of Molecular Sciences 20, no. 6 (March 15, 2019): 1311. http://dx.doi.org/10.3390/ijms20061311.

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Mesostructured ordered silica-based materials are the promising candidates for local drug delivery systems in bone disease due to their uniform pore size and distribution, and high surface area which affect their excellent adsorption properties, good biocompatibility and bioactivity, and versatile functionalization so that their properties can be controlled. Ordered mesoporous silica (MCM-41 type) was synthesized by a surfactant-assisted sol-gel process using tetraethoxysilane as a silica precursor and hexadecyltrimethylammonium bromide as the structure-directing agent. Functionalized silica materials containing various types of organic groups (3-aminopropyl, 3-mercaptopropyl, or 3-glycidyloxypropyl groups) were synthesized by the post-grafting method onto pre-made mesoporous silica. Comparative studies of their structural characteristics, the surface mineralization activity and release properties for the model drug Metronidazole (MT) were then conducted. It has been found that porosity parameters, mineralization activity and adsorption/release of metronidazole from mesoporous channels of silica can be regulated using functional groups which are chemically bounded with an outer silica surface. The preferential mineral nucleation was found on negatively charged surfaces—MCM-41, and mercaptopropyl and glycidyloxypropyl functionalized silica (MCM-SH and MCM-epoxy, respectively) in simulated body fluid (SBF solution), as well as a sustained release of MT. In contrast to them, aminopropyl-functionalized samples (MCM-NH2) achieved a high MT release rate. These results confirm the potential of silica-based materials for local therapeutic applications (as drug carriers and bone substitutes) in bone disease.

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24

Franklin, Kevin R., and Barrie M. Lowe. "Crystallization of silica molecular sieves from piperazine — quaternary ammonium bromide — silica — water systems." Zeolites 8, no. 6 (November 1988): 501–7. http://dx.doi.org/10.1016/s0144-2449(88)80227-6.

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25

Bremere, Ingrida, Maria Kennedy, Sahar Mhyio, Abdulfattah Jaljuli, Geert-Jan Witkamp, and Jan Schippers. "Prevention of silica scale in membrane systems: removal of monomer and polymer silica." Desalination 132, no. 1-3 (December 2000): 89–100. http://dx.doi.org/10.1016/s0011-9164(00)00138-7.

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26

Barlet, Grace, Rosemary K. Sokas, and Eileen Betit. "Operating Engineers and the OSHA Silica Standard: A Survey of Union Trainers." NEW SOLUTIONS: A Journal of Environmental and Occupational Health Policy 29, no. 4 (November 14, 2019): 530–35. http://dx.doi.org/10.1177/1048291119889006.

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Enclosed cabs with filtration systems, an engineering control preferred in the hierarchy of controls, may reduce heavy equipment operators’ silica exposure during demolition, grading, and excavation. We surveyed operating engineer trainers about silica training, familiarity with the Occupational Safety and Health Administration (OSHA) silica standard, and cab filtration systems. A voluntary and anonymous online survey was e-mailed to 437 trainers in January 2018. The response rate was 22.9 percent (n = 100). Most trainers (84 percent) covered health risks and silica exposure prevention in their courses. Of these, 59 percent discussed cab filtration as an engineering control. Trainers identified possible barriers to the use of cab filtration systems and a need for education to increase use, and raised concerns about other exposures associated with heavy equipment use. Education about selection, use, and maintenance of cab filtration systems to control silica exposure is needed. Engineering improvements to heavy equipment should address cab filtration, noise, heat, and vibration.

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27

Svatovskaya, Larisa, Anastasia Sychova, and Maxim Sychov. "Silica sol properties for construction." MATEC Web of Conferences 193 (2018): 03034. http://dx.doi.org/10.1051/matecconf/201819303034.

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The article deals with a number of topical issues connected with transport construction and environmental pollution, such as heavy metal ion pollutions of soils, preservation of natural resources, technical properties of transport construction system, and building materials’ improvement. The main aim of the study is to present new problem solutions and technologies for transport construction concerning pure substance use for lithosphere. Silica sol solution was chosen as this substance. The choice was made because of silica sol nature. Having important properties, it is the purest substance for the environment. Experimental methods were carried out. The study introduces new technologies of silica sol solution use in transport construction systems: silica sol detoxication technology (SDT) for soils, silica sol absorption technology (SAT), soil strengthening technology (SST), silica sol blocking action technology (SBT). The article shows the examples of these technologies’ application and examines new main properties of construction systems.

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28

Vallet-Regí, María, and Francisco Balas. "Silica Materials for Medical Applications." Open Biomedical Engineering Journal 2, no. 1 (January 29, 2008): 1–9. http://dx.doi.org/10.2174/1874120700802010001.

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The two main applications of silica-based materials in medicine and biotechnology,i.e.for bone-repairing devices and for drug delivery systems, are presented and discussed. The influence of the structure and chemical composition in the final characteristics and properties of every silica-based material is also shown as a function of the both applications presented. The adequate combination of the synthesis techniques, template systems and additives leads to the development of materials that merge the bioactive behavior with the drug carrier ability. These systems could be excellent candidates as materials for the development of devices for tissue engineering.

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29

Ren, Hao, Xiao Lian Yang, and Gui Lan Song. "Study on the Interaction in Silica-Sphalerite-Mixture (Silica:Sphalerite=4:1)-Gypsum Systems." Advanced Materials Research 524-527 (May 2012): 1101–4. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.1101.

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There is a remarkable interaction when fine particles adsorbed calcium ions in sphalerite / silica system, it is not conducive to mineral flotation. That is the key to how to reduce or eliminate calcium ions for reducing the interactions. This paper focuses on Zeta potential and Zeta potential distribution (ZPD) with single minerals and Mixture (silica/sphalerite=4:1) in gypsum solution, and the interactions of the sphalerite / silica particles was analyzed.

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30

Andriani, Yuli, ,. Zahidah, Yayat Dhahiyat, Ujang Subhan, Irfan Zidni, Rusky Intan Pratama, and Nadia Purnamasari Gumay. "The effectiveness of the use of filter on the number of Nitrosomonas sp. and water quality in aquaponics systems." Jurnal Akuakultur Indonesia 17, no. 1 (January 29, 2018): 1. http://dx.doi.org/10.19027/jai.17.1.1-8.

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<p><strong>ABSTRACT</strong></p><p>This study aims to determine the most effective type of living filter media for the bacteria Nitrosomonas sp. in order to improve water quality in aquaponics systems. The method used in this study was completely randomized design, consisting of five treatments and each was repeated three times. The treatments were: A (without addition of filter media), B (addition of palm fibers, silica sand, and activated carbon), C (addition of palm fibers, silica sand, gravel, and activated carbon), D (addition of palm fibers, silica sand, rocks, and activated carbon), and E (addition of palm fibers, silica sand, bioball, and activated carbon). Parameters measured were: 1) the number of Nitrosomonas bacteria, 2) water quality (ammonia, nitrate, and phosphate); and, 3) productivity of fish and Chinese spinach. Data were analyzed using a descriptive method. The findings show that the highest number of bacteria was found in treatment E, 9.29×105 CFU/mL on the bioball filter media and 4.43×105 CFU/mL in rearing tanks. The best water quality was in treatment B, with a concentration of ammonia of 0.17 mg/L, nitrate of 0.33 mg/L, and phosphate of 0.54 mg/L. Plant productivity was the best in treatment B in which the average length and weight reach 48.1 cm and 11.1 grams of plant/week, respectively. The best fish growth was seen in treatment C with an absolute growth rate of 4.4 grams and a specific growth rate of 1.9%/day. The recommended filter was made of Arenga pinnata fibers, silica sand, gravels, and active carbon of about 2 cm thick each.The results showed that the type of filter on the aquaponic system had an effect on the amount of Nitrosomonas sp. in water, water quality, and the productivity of Chinese spinach.</p><p>Keywords: aquaponics, filter, water quality, Nitrosomonas sp.</p><p><strong>ABSTRAK</strong></p><p>Penelitian ini bertujuan untuk menentukan jenis filter yang paling efektif sebagai media hidup bakteri Nitrosomonas sp. sehingga menghasilkan kualitas air yang baik dalam sistem akuaponik. Rancangan percobaan yang digunakan adalah rancangan acak lengkap, yaitu lima perlakuan dengan tiga kali pengulangan. Perlakuan dalam penelitian ini meliputi: A (tanpa penambahan media filter), B (penambahan media filter ijuk, pasir silika, dan karbon aktif), C (penambahan media filter ijuk, pasir silika, kerikil, dan karbon aktif), D (penambahan media filter ijuk, pasir silika, batu, dan karbon aktif), dan E (penambahan media filter ijuk, pasir silika, bioball, dan karbon aktif). Parameter yang diamati adalah: 1) jumlah bakteri, 2) kualitas air (meliputi amonia, nitrat, dan fosfat), serta 3) produktivitas ikan dan kangkung air. Data hasil penelitian dianalisis secara deskriptif. Hasil penelitian menunjukkan bahwa jumlah kelimpahan bakteri Nitrosomonas sp. tertinggi terdapat pada perlakuan E, yaitu 9,29×105 CFU/mL pada media filter bioball dan 4,43×105 CFU/mL pada media air pemeliharan. Adapun kualitas air terbaik yaitu pada perlakuan B dengan konsentrasi amonia 0,17 mg/L, nitrat 0,33 mg/L, dan fosfat 0,54 mg/L. Produktivitas kangkung terbaik yaitu pada perlakuan B dengan panjang rata-rata mencapai 48,1 cm dan bobot tanaman 11,1 gram/minggu. Pertumbuhan ikan terbaik terdapat pada perlakuan C, dengan nilai pertumbuhan ikan mutlak sebesar 4,4 gram dan pertumbuhan spesifik 1,9%/hari. Hasil penelitian menunjukkan bahwa jenis filter pada sistem akuaponik berpengaruh terhadap jumlah Nitrosomonas sp. dalam air, kualitas air, dan produktivitas tanaman kangkung. Filter yang disarankan dari hasil penelitian ini adalah yang tersusun atas ijuk, pasir silika, batukerikil, dan karbon aktif masing-masing setinggi ±2 cm.</p><p>Kata kunci: akuaponik, filter, kualitas air, Nitrosomonas sp., produktivitas tanaman</p>

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31

OH, SEUNG TAEK, BIDYUT BARAN SAHA, KEISHI KARIYA, YOSHINORI HAMAMOTO, and HIDEO MORI. "FUEL CELL WASTE HEAT POWERED ADSORPTION COOLING SYSTEMS." International Journal of Air-Conditioning and Refrigeration 21, no. 02 (June 2013): 1350010. http://dx.doi.org/10.1142/s2010132513500107.

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In the present paper, the effect of desorption temperature on the performance of adsorption cooling systems driven by waste heat from fuel cells was analyzed. The studied adsorption cooling systems employ activated carbon fiber (ACF) of type A-20–ethanol and RD type silica gel–water as adsorbent–refrigerant pairs. Two different temperature levels of waste heat from polymer electrolyte fuel cell (PEFC) and solid oxide fuel cell (SOFC) are used as the heat source of the adsorption cooling systems. The adsorption cycles consist of one pair of adsorption–desorption heat exchanger, a condenser and an evaporator. System performance in terms of specific cooling capacity (SCC) and coefficient of performance (COP) are determined and compared between the studied two systems. Results show that silica gel–water based adsorption cooling system is preferable for effective utilization of relatively lower temperature heat source. At relatively high temperature heat source, COP of ACF–ethanol based adsorption system shows better performance than that of silica gel–water based adsorption system.

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32

ElSaeedy, H. I., A. A. S. Al Ahmari, K. F. Abd El-Rahman, and S. Taha. "Effect of Nano-Silica on The Thermo-Physical Properties of the Thermal Eutectic (Na0.6K0.4)NO3 System." Energy and Earth Science 3, no. 1 (May 26, 2020): p59. http://dx.doi.org/10.22158/ees.v3n1p59.

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Here, we investigate the effect of adding nano-silica particles on the thermo-physical properties of the (Na0.6K0.4)NO3 based thermal energy storage systems. Five different systems tagged as M00, M01, M02, M03 and M04, with different nano-silica percentage of 0, 1, 2, 3, and 4 wt%, respectively, were prepared. Various experimental techniques were employed to study the thermo-physical properties of the systems during (solid-solid) phase P1, (solid-liquid) phase P2 and (liquid-solid) phase P3, and to clarify the effect of nano-silica on the thermal energy storage efficiency during both charging and discharging processes. According to the Differential Scanning Calorimeter (DSC) thermal analysis, it was found that the system M02 whose nano-silica addition rate of 2 wt%, has the most favorable thermal characteristics (i.e., highest specific heat and lowest enthalpy change). Moreover, the addition of 2 wt% represents the optimum distribution of nano-silica inside the principal base system M00. This leads to an improvement in the porosity of the system due to the degree of homogeneity caused by the thermophoresis effect distribution, the high surface area of the nano-silica with the activity of the M00 matrix alongside the degree of the alkalinity of nano-silica. Besides, the electric conductivity measurements showed that the 2wt% percentage is the optimum one for thermal energy storage systems.

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33

Holovan, A. P., T. V. Krupska, and V. V. Тurov. "Film stimulating coatings for seeds based on silica mixtures." Himia, Fizika ta Tehnologia Poverhni 12, no. 1 (March 30, 2021): 52–57. http://dx.doi.org/10.15407/hftp12.01.052.

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For improve the quality of harvests, modern farms in many countries widely use fertilizers of mineral and natural origin. To mitigate the negative impact on the environment, they try to minimize the amount of mineral fertilizers applied to the soil by creating composite systems. In particular, powdered composite materials are known based on highly dispersed silica and microquantities of mineral fertilizers, which are applied to the surface of the seeds by dusting. The aim of this work was to develop a new generation of film stimulating coatings based on mixtures of hydrophobic AM-1-300 and hydrophilic A-300 silicas, mineral fertilizers and bioactive components. Mixtures of hydrophilic and hydrophobic silicas in the ratio 1:1 and 1:2 were used to obtain a pasty composite with the given stimulating properties; colloidal starch solution; medium salts of mineral acids, bioactive components “Humifriend” and fungicide “Fital”. Such composite systems were applied directly to the surface of sowing material, grains of wheat variety “Natalka” before sowing in sand and on filter paper, according to DSTU 4138-2002. During the study, the following parameters were measured: seed germination energy, germination and morphological characteristics of wheat germs, which consisted in measuring the length of the root and stem. It is shown that when editing certain amounts of bioactive components to the composition of stimulating pasty composites, it is possible to program the properties of future films and powders: to increase morphological characteristics, uniformity of germination and fungicidal characteristics of composites. It has been found that the presence of mineral fertilizers in pasty composites of silicas mixtures 1:1 and 1:2 has a positive effect on the uniform germination of wheat seeds in the sand and on the filter paper. Instead, the presence in the pastes of the active ingredients “Fital” and “Humifriend”, regardless of the environment where the seeds germinated, there is a significant slowdown in the growth of wheat germ in both environments. It has been found that an excess of hydrophilic silica in the pasty composite leads to the development on the surface of the grains of mycosis lesions, regardless of the germination environment. Therefore, stimulant pastes based on 1:2 silica mixtures must contain fungicides of mineral or biological origin.

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34

Львов, V. Lvov, Павлихин, Gennadiy Pavlikhin, Калугина, and O. Kalugina. "Evaluation of Silica Gel Water Capacity for Pneumatic Systems’ Safe Operation Assurance." Safety in Technosphere 3, no. 6 (December 23, 2014): 43–52. http://dx.doi.org/10.12737/6635.

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An analysis of main methods for silica gel water capacity determining has been presented. A new method of silica gel water capacity’s experimental evaluation in pneumatic systems’ operating conditions has been developed. Bases of fundamental method for constant humidity assurance of compressed air used for silica gel water capacity evaluations have been revealed. A description of a test bench for this fundamental method practical realization has been presented. A technique for experimentation with proposed method’s different modifications has been described. Measurement error estimation has been performed. Experimental results of finely porous silica gel water capacity evaluation in static conditions and in absorption process’s different parameters while using this method have been presented. These results’ correlation between similar data obtained by other methods has been carried out. Analyses results’ statistical processing has been carried out and it has been shown that a packed density of finely porous silica gel can be considered only as the indirect and qualitative characteristic of its water capacity which isn´t allowing to provide the necessary accuracy of quantitative estimates for pneumatic systems’ operation safety assurance.

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35

Tayeh, Bassam A., B. H. Abu Bakar, M. A. Megat Johari, and A. M. Zeyad. "The Role of Silica Fume in the Adhesion of Concrete Restoration Systems." Advanced Materials Research 626 (December 2012): 265–69. http://dx.doi.org/10.4028/www.scientific.net/amr.626.265.

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The weak interfacial transition zone between new and old concrete is always paid much attention and controls many properties of repaired concrete, The present work reports a study on the influence of the silica fume on the adhesion of reactive powder concrete (RPC), as a concrete restoration material, with the ordinary concrete (OC) substrate. The results showed that, the silica fume presence in the interfacial transition zone significantly enhances the adhesion strength between RPC and OC substrate. Furthermore, the silica fume particles consume calcium hydroxide, which is in attendance in the interfacial transition zone, and make the zone more dense, uniform and tough.

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36

Belyanovskaya, Elena, R. Lytovchenko, Konstanthyn Sukhyy, O. Prokopenko, O. Yeromin, and I. Sukha. "Choice Criteria of Adsorbents for Heat Energy Converters in Ventilation Systems." Scientific Works 83, no. 1 (September 1, 2019): 4–9. http://dx.doi.org/10.15673/swonaft.v83i1.1409.

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The criteria of adsorbent selection for adsorption transformers of thermal energy in ventilation systems are considered. The main characteristics of adsorbents that affected the structural parameters of the adsorption module are revealed. The method of determining the mass of the adsorbent and the volume of the adsorption unit in ventilation systems has been developed. The main factor affecting the volume of adsorbent is confirmed to be maximal adsorption. The advantages of ‘salt in the porous silica gel matrix’ composites are compared with traditional silica gels. On the example of an adsorption regenerator of low-potential heat and moisture, the greater effectiveness of the composites "silica gel-sodium sulphate" is shown in comparison with the composite 'silica gel - sodium acetate'. According to the experimental data on the operation of the adsorption regenerator of heat and moisture on the basis of the composite 'silica gel – CH3COONa', the adequacy of the proposed algorithm for determining the temperature efficiency factor has been confirmed. Suggested algorithm includes the calculation of the air volume passed through the layer of heat-storage material, water concentration in the air at the exit from the heat accumulator, adsorption, heat of adsorption, the final cold air temperature, air temperature after mixing cold air from the street and the warm air in the room at the inlet, the calculation of the concentration of water in the flow at the exit from the heat regenerator, the adsorption and heat of adsorption, the final temperature of the warm air, the air temperature after mixing the cold air from the street and the warm air from the room during the discharge, determination of the temperature efficiency factor, total adsorption and time to achieve the maximal adsorption. The efficiency of the processes of operating adsorption regenerators based on composites 'silica gel - sodium sulphate' and 'silica gel-sodium acetate' in the conditions of the typical ventilation system of housing premises was compared. The parameters that correspond to the maximum value of the temperature efficiency factors: the humid air velocity is about 0.22 - 0.32 m/s and the time of switching of the flows up to 5 minutes. The influence of meteorological conditions on the efficiency of the adsorption regenerator has been confirmed. The higher efficiency of adsorption regenerators based on 'silica gel - sodium sulphate' composites is explained, which is explained by higher values of maximal adsorption, which results in increasing the heat of adsorption. The results of the research can be used for the selection of adsorbents for energy-efficient heat energy converters in ventilation systems for residential and warehouse premises.

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37

Trukawka, Martyna, Krzysztof Cendrowski, Wojciech Konicki, and Ewa Mijowska. "Folic Acid/Methotrexate Functionalized Mesoporous Silica Nanoflakes from Different Supports: Comparative Study." Applied Sciences 10, no. 18 (September 17, 2020): 6465. http://dx.doi.org/10.3390/app10186465.

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Herein, we present a facile synthesis route for the mesoporous silica nanoflakes on two types of templates and evaluate their potential as potential drug delivery systems. Silica materials are attractive due to their biocompatibility, low cytotoxicity, high surface area, and tunable pores. In addition, they can be multifunctionalized. These properties were used to create multifunctional drug delivery systems combining folic acid as a target molecule and methotrexate (MTX) as an anticancer drug. The silica nanoflakes were formed using graphene oxide and double-layered hydroxide as templates, respectively. After the removal of matrices, the silica flakes were functionalized by folic acid and loaded with methotrexate. The differences in drug release performance and structural stability were analyzed with respect to the detailed physicochemical characterization of the produced silica nanoflakes.

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38

Rouseková, I., A. Bajza, and V. Živica. "Silica fume-basic blast furnace slag systems activated by an alkali silica fume activator." Cement and Concrete Research 27, no. 12 (December 1997): 1825–28. http://dx.doi.org/10.1016/s0008-8846(97)00191-9.

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39

Holderer, O., S. Maccarrone, S. Pasini, M. S. Appavou, and A. Gelissen. "Raspberry structures in microgel–silica nanoparticle composite systems." Results in Physics 21 (February 2021): 103805. http://dx.doi.org/10.1016/j.rinp.2020.103805.

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40

Andersson, Kjell, and Erik Lindgren. "Important properties of colloidal silica in microparticulate systems." Nordic Pulp & Paper Research Journal 11, no. 1 (January 1, 1996): 15–21. http://dx.doi.org/10.3183/npprj-1996-11-01-p015-021.

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41

Herrington, R. J., and J. J. Wilkinson. "Colloidal gold and silica in mesothermal vein systems." Geology 21, no. 6 (1993): 539. http://dx.doi.org/10.1130/0091-7613(1993)021<0539:cgasim>2.3.co;2.

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42

YAMADA, Hirohito. "Photonic Integration by Hybrid Silicon/Silica Waveguide Systems." Review of Laser Engineering 42, no. 3 (2020): 245. http://dx.doi.org/10.2184/lsj.42.3_245.

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43

Nazhat, S. N., S. Parker, and M. Braden. "Silica-filled elastomer/methacrylate systems as soft liners." Journal of Biomaterials Science, Polymer Edition 15, no. 6 (January 2004): 727–39. http://dx.doi.org/10.1163/156856204774196126.

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44

Bibby, D. M., and M. P. Dale. "Synthesis of silica-sodalite from non-aqueous systems." Nature 317, no. 6033 (September 1985): 157–58. http://dx.doi.org/10.1038/317157a0.

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45

Silveira, Kátia Fraga, Inez Valéria P. Yoshida, and Suzana Pereira Nunes. "Phase separation in PMMA/silica sol-gel systems." Polymer 36, no. 7 (March 1995): 1425–34. http://dx.doi.org/10.1016/0032-3861(95)95921-m.

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46

Rashchi, Fereshteh, Zhenghe Xu, and James A. Finch. "Adsorption on silica in Pb and CaSO4CO3 systems." Colloids and Surfaces A: Physicochemical and Engineering Aspects 132, no. 2-3 (January 1998): 159–71. http://dx.doi.org/10.1016/s0927-7757(97)00188-x.

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47

Fontana, A., M. Montagna, L. Righetti, F. Rossi, G. Cicognani, A. J. Dianoux, and F. Terki. "Inelastic neutron scattering on silica xerogel porous systems." Journal of Non-Crystalline Solids 280, no. 1-3 (February 2001): 217–21. http://dx.doi.org/10.1016/s0022-3093(00)00378-1.

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48

Kierys, Agnieszka, Radosław Zaleski, Marta Grochowicz, Marek Gorgol, and Andrzej Sienkiewicz. "Polymer–mesoporous silica composites for drug release systems." Microporous and Mesoporous Materials 294 (March 2020): 109881. http://dx.doi.org/10.1016/j.micromeso.2019.109881.

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49

Hsu, Shih-Yi, Robert Morris, and Feng Cheng. "Signaling Pathways Regulated by Silica Nanoparticles." Molecules 26, no. 5 (March 5, 2021): 1398. http://dx.doi.org/10.3390/molecules26051398.

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Silica nanoparticles are a class of molecules commonly used in drug or gene delivery systems that either facilitate the delivery of therapeutics to specific drug targets or enable the efficient delivery of constructed gene products into biological systems. Some in vivo or in vitro studies have demonstrated the toxic effects of silica nanoparticles. Despite the availability of risk management tools in response to the growing use of synthetic silica in commercial products, the molecular mechanism of toxicity induced by silica nanoparticles is not well characterized. The purpose of this study was to elucidate the effects of silica nanoparticle exposure in three types of cells including human aortic endothelial cells, mouse-derived macrophages, and A549 non-small cell lung cancer cells using toxicogenomic analysis. The results indicated that among all three cell types, the TNF and MAPK signaling pathways were the common pathways upregulated by silica nanoparticles. These findings may provide insight into the effects of silica nanoparticle exposure in the human body and the possible mechanism of toxicity.

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García-Casas, Ignacio, Antonio Montes, Diego Valor, Clara Pereyra, and Enrique J. Martínez de la Ossa. "Deposition of CAP/Antioxidants Systems on Silica Particles Using the Supercritical Antisolvent Process." Applied Sciences 10, no. 13 (July 1, 2020): 4576. http://dx.doi.org/10.3390/app10134576.

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Supercritical carbon dioxide has been used to deposit co-precipitates of natural antioxidants with a polymer onto silica microparticles. The supercritical antisolvent process (SAS) was carried out with the antioxidants by introducing the silica microparticles into the precipitator vessel. Two different configurations were employed to pump the solution. In one configuration, the antioxidant and the polymer were dissolved and injected together through a nozzle. In the second configuration, the antioxidant and the polymer were dissolved in different solutions and sprayed through different nozzles. The use of operating conditions significantly above the critical point (180 bar and 323 K) led to the formation of composites made up of co-precipitates and silica. Delivery profiles showed that the presence of the polymer and the silica delayed release of the antioxidant into gastric media, thus protecting it and allowing its full delivery to the intestinal fluids to improve the effectiveness of the antioxidant.

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