Journal articles: 'Films de silice'

1

Bouchard, H., A. Azelmad, J. F. Currie, and M. Meunier. "Variation de la contrainte des verres de silice sous cycle thermique." Canadian Journal of Physics 70, no. 10-11 (October 1, 1992): 830–33. http://dx.doi.org/10.1139/p92-131.

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Using an in situ technique, stress was measured as a function of annealing temperature to investigate the effect of phosphorous and boron doping of silicon dioxide glass films deposited by low-pressure chemical vapor deposition (LPCVD). It was found that the initial stress of phosphosilicate glass is independent of the amount of phosphorus present, while the boron content influences the initial stress in borophosphosilicate glass. The stress increases to a maximum, σm, corresponding to a temperature Tm, above which the onset of viscous flow reduces the stress to zero at a temperature T0. All these parameters are dependant on dopant concentrations. The observed mechanical behavior is discussed in terms of film viscosity.

2

Bahlawane, N., M. Charbonnier, and M. Romand. "Apport des techniques XRFS et LEEIXS à l'étude de la formation de films de silice sur acier par PACVD." Le Journal de Physique IV 08, PR5 (October 1998): Pr5–271—Pr5–278. http://dx.doi.org/10.1051/jp4:1998534.

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Balan, Poovarasi, Aaron Ng, Chee Beng Siang, R. K. Singh Raman, and Eng Seng Chan. "Effect of Nanoparticle Addition in Hybrid Sol-Gel Silane Coating on Corrosion Resistance of Low Carbon Steel." Advanced Materials Research 686 (April 2013): 244–49. http://dx.doi.org/10.4028/www.scientific.net/amr.686.244.

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Chromium pre-treatments of metal have been replaced by silane pre-treatments as more environmental friendly option. Nanoparticles can be added in the silane sol-gel network have been reported to improve corrosion resistance. In this work, the electrochemical corrosion resistance of low carbon steel coated with hybrid organic-inorganic sol-gel film filled with nanoparticles was evaluated. The sol-gel films have been synthesized from 3-glycidoxy-propyl-trimethoxy-silane (3-GPTMS) and tetra-ethyl-ortho-silicate (TEOS) precursors. These films have been impregnated with 300 ppm of silica or alumina nanoparticles. The electrochemical behavior of the coated steel was evaluated by means of electrochemical impedance spectroscopy (EIS) and scanning electron microscopy (SEM). Equivalent circuit modeling, used for quantifying the EIS measurements showed that sol-gel films containing silica nanoparticles improved the barrier properties of the silane coating. The silica nanoparticle-containing films showed highest initial pore resistance over the five days of immersion in 0.05M NaCl.

4

Park, Hoy Yul, Dong Pil Kang, In Hye Myung, and Seog Young Yoon. "Properties of Coating Films Synthesized from Nano Colloidal Silica and Alkoxy Silanes." Materials Science Forum 510-511 (March 2006): 222–25. http://dx.doi.org/10.4028/www.scientific.net/msf.510-511.222.

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Colloidal silica/silane sol solutions were prepared in variation with the ratio of silane to colloidal silica. Such sol solutions were synthesized from colloidal silica/tetramethoxysilane (TMOS)/methyltrimethoxysilane(MTMS). Sol solutions were prepared by sol-gel reaction through two step reactions. To understand their physical and chemical properties, dip coating of sol solutions was performed on the glass substrates. Contact angle and thickness of coating films increased with increasing the amount of MTMS. The surface free energy of coating films decreased with increasing amount of MTMS. Coating films were stable until 550°C. Thermal degradation temperature of coating films decreased with increasing amount of MTMS. Plastic hardness decreased with increasing amount of MTMS. Elastic portion increased with increasing amount of MTMS.

5

Tao, Yao, Feng Zheng, Zhao Chen, Shuangshuang Chen, Xuemin Lu, and Qinghua Lu. "Comparison of hybrid polyimide films with silica and organosilica obtained via sol–gel process." High Performance Polymers 29, no. 9 (September 14, 2016): 1049–57. http://dx.doi.org/10.1177/0954008316668242.

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A series of polyimide/silica (PI–S) and polyimide/organosilica (PI–OS) hybrid films were prepared via a sol–gel process from mixtures of poly(amic acid) (PAA) and tetraethoxysilane or a silane coupling agent in solution. The PAA was synthesized from bis-(3-phthalyl anhydride) ether and 1,4-bis (4-aminophenoxy) benzene. The hybrid films were produced via an imidization reaction to form silica particles or a silica network in a polymer matrix through a programmed heating process. The derived films were characterized and compared by Fourier transform infrared spectroscopy, field emission scanning electron microscopy, thermogravimetric analysis, tensile testing, contact angle measurements, moisture absorption measurements, and dielectric property analysis. Both the PI–S and PI–OS hybrid matrixes showed strong regularity with the increasing silica content and greatly improved thermal stability and mechanical properties. Among them, the PI–OS hybrid films possessed superior interphase interactions and were found to have better physicochemical properties.

6

Jiang, Pei-Cheng, Yu-Ting Chow, Chi-Wei Chien, Cheng-Hsun-Tony Chang, and Chii-Ruey Lin. "Silica Layer Used in Sensor Fabrication from a Low-Temperature Silane-Free Procedure." Chemosensors 9, no. 2 (February 4, 2021): 32. http://dx.doi.org/10.3390/chemosensors9020032.

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Silica (SiO2, silicon dioxide—a dielectric layer commonly used in electronic devices) is widely used in many types of sensors, such as gas, molecular, and biogenic polyamines. To form silica films, core shell or an encapsulated layer, silane has been used as a precursor in recent decades. However, there are many hazards caused by using silane, such as its being extremely flammable, the explosive air, and skin and eye pain. To avoid these hazards, it is necessary to spend many resources on industrial safety design. Thus, the silica synthesized without silane gas which can be determined as a silane-free procedure presents a clean and safe solution to manufactures. In this report, we used the radio frequency (rf = 13.56 MHz) plasma-enhanced chemical vapor deposition technique (PECVD) to form a silica layer at room temperature. The silica layer is formed in hydrogen-based plasma at room temperature and silane gas is not used in this process. The substrate temperature dominates the silica formation, but the distance between the substrate and electrode (DSTE) and the methane additive can enhance the formation of a silica layer on the Si wafer. This silane-free procedure, at room temperature, is not only safer and friendlier to the environment but is also useful in the fabrication of many types of sensors.

7

Zhou, Yingyu, and Hongling Chen. "Robust Super-Repellent Anisotropic Silica Films by Emulsion-Based Sol–Gel Growth." Nano 13, no. 01 (January 2018): 1850005. http://dx.doi.org/10.1142/s1793292018500054.

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In this paper, anisotropic SiO2 with different morphologies were synthesized through an emulsion-based one-pot method by adding various silane coupling agents. Silane coupling agents affected the growth of silica nanostructures at the oil/water interfaces. Robust super-repellent film that showed great durability under different harsh conditions were obtained by bonding the self-assembled anisotropic silica nanostructures (ASN) film to substrate by the commercial acrylic adhesive. The film switched from superhydrophobic (157.1[Formula: see text] to superhydrophilic (0[Formula: see text] after being heat-treated at 500[Formula: see text]C. Further, silane treatment with addition of acid reduced the time of modification. Meanwhile, silane grafting density was improved and superhydrophobicity of calcinated ASN films was regenerated.

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Na, Moon Kyong, Dong Pil Kang, Hoy Yul Park, Myeong Sang Ahn, and In Hye Myung. "Properties of Nano-Hybrid Sol-Gel Materials Synthesized from Colloidal Silica-Silane Containing Epoxy Silane." Key Engineering Materials 336-338 (April 2007): 2278–81. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.2278.

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Three kinds of colloidal silica (CS)/silane sol solutions were synthesized in variation with parameters such as different acidity and reaction time. Sol solutions were prepared from HSA CS/ methyltrimethoxysilane (MTMS), LS CS/MTMS and LS CS/MTMS/γ -Glycidoxypropyltri methoxysilane (ES) solutions. In order to understand their physical and chemical properties, sol-gel coating films were fabricated on glass. Coating films on glass, obtained from LS/MTMS sol, had high contact angle, also, much enhanced flat surface in the case of LS/MTMS sol was observed in comparison with HSA/ MTMS sol. From all sol-gel solutions, seasoning effect of for enhancing properties of sol-gel coating layer on glass was observed while such sol-gel solutions were left for 7days. In initial stage of sol-gel reaction, all most of sol solutions used in this work seem to be unstable, formation of coating films was a little hazy and rough. However, improved coating films as observed in 4days later. LS/MTMS/ES sol solutions were synthesized with ES, adding to LS/MTMS sol. Contact angle of LS/MTMS/ES sol-gel coating films decreased, since ES played a role in forming hydrophilic hydroxyl sol. The elastic portion of coating films prepared from LS/MTMS/ES sol increased with addition of ES, but thermal stability decreased a little.

9

Mahdi, Billal, and Farid Rouabah. "Effect of Titanium Dioxide Nanoparticles on the Properties of Poly(Vinyl Alcohol)/Silica Hybrid Films Prepared by the Sol-Gel Method." Nano Hybrids and Composites 38 (February 3, 2023): 63–79. http://dx.doi.org/10.4028/p-381bv9.

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This work is focused on the preparation and characterization of poly (vinyl alcohol)/silica gel/Nano-TiO2, and the study of titanium dioxide (TiO2) nanoparticles (from 1 to 5%) on the properties of poly (vinyl alcohol) (PVA)/silica films. This new material was prepared by the sol-gel method using poly (vinyl alcohol) powder with Tetraethyl Orthosilicate (TEOS) as a precursor source of silica. TEOS was hydrolyzed and condensed in water and ethanol in the presence of hydrochloric acid (HCl) used as a catalyst. Fourier transform infrared (FT-IR), water absorption, water contact angle, ultraviolet-visible spectrometry (UV-VIS), and thermogravimetric analysis (TGA) were used to characterize the hybrid films obtained. The PVA/SiO2/Nano-TiO2 films were successfully synthesized. Owing to the FT-IR Analysis, the chemical bonds have clearly shown that the PVA backbone is linked to the (SiO2-TiO2) network. UV-VIS tests indicated that the hybrid films' UV shielding properties were drastically enhanced as a result of the addition of TiO2. According to the TGA tests, the hybrid films are more heat tolerant than neat PVA films. The water contact angle results revealed that TiO2 nanoparticles used as a doping compound possess an important influence on the hydrophilicity of PVA/SiO2 as thin films. The film's water resistance has also been enhanced.

10

Kurniasih, Yeti, Hasan Basri, and Baiq Asma Nufida. "The Effect of Type and Concentration of Receiving Phase on Silver Separation Efficiency by Supported Liquid Membrane Technique." Jurnal Ilmiah Mandala Education 10, no. 1 (January 4, 2024): 53. http://dx.doi.org/10.58258/jime.v10i1.6504.

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The Effect of The Type and Concentration of The Receiving Phase on The Efficiency Of Silver Separation with Liquid Supported Membrane Techniques. The process of making negative x-ray films in a radiology laboratory produces liquid wastes containing various chemical compounds with the main content being Ag metal (in the form of Ag+ cations). This waste is categorized as a dangerous and toxic material. Therefore it is necessary to separate the Ag metal before it is discharged into the environment so as not to be harmful to life and the environment. One of the separation techniques that can be used is with supported fluid membrane technique (Supported Liquid Membrane, SLM). The supported liquid membrane has three important components: the feed phase containing the component to be separated, the membrane phase containing the carrier compound and the receiving phase containing the integral component. The three-phase composition determines the efficiency of the separation process. This study aims to identify the type and concentration of the receiving phase solution to improve silice metal separation efficiency by SLM technique. To obtain an efficient composition in the recipient phase was carried out by varying the type of acid received solution ie H3PO4, HNO3 and CH3COOH with respective concentrations of 0.01; 0.05; 0.10; 0.15; and 0.20 M. Measurement of metal ion concentration of Ag+ before and after transport was determined by Atomic Absorption Spectrophotometer (SSA) at wavelength 328,22 nm. Based on the result of research that type and concentration of acid solution in the receiving phase has an effected on separation efficiency. The optimum transport percentage has obtained on the used of H3PO4 receptor solution at a concentration of 0.1 M with a percentage of Transport Ag of 46.84%.

11

Yoo, Woo Sik, Richard Swope, Barbara Sparks, and David Mordo. "Comparison of C2F6 and FASi-4 as fluorine dopant sources in plasma enhanced chemical vapor deposited fluorinated silica glass films." Journal of Materials Research 12, no. 1 (January 1997): 70–74. http://dx.doi.org/10.1557/jmr.1997.0012.

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Fluorine doping of silicon dioxide films in tetraethylorthosilicate (TEOS)-based plasma enhanced chemical vapor deposition (PECVD) processes was investigated using two fluorine dopant sources, C2F6 and 1,2 bis[methyldifluorosilyl]ethane (FASi-4). Much as TEOS-based undoped silica glass (USG) films display improved step coverage over silane-based USG films, it was suspected that fluorinated silica glass (FSG) films deposited using the relatively new TEOS-based fluorine source FASi-4 might have improved gap fill capabilities as compared to FSG films deposited using gas-based C2F6 fluorine sources. The physical properties and intermetal gap filling capabilities of FSG films deposited using FASi-4 as a fluorine dopant source were compared with the properties of FSG films deposited using C2F6 as a fluorine source. Fluorine dopant levels in the films were found to be linear functions of C2F6TEOS and FASi-4yTEOS ratios. The RI, film stress, and gap fill capability were found to be strongly dependent on the Si–F content in the film regardless of dopant source reagents. Improved gap fill characteristics were observed in films doped with FASi-4 at a given Si–F/Si–O% as compared to C2F6-based FSG films. Dopant source dependence of doping characteristics, physical properties, and gap filling capability of FSG films is reported.

12

Raditoiu, Alina, Valentin Raditoiu, Florentina Monica Raduly, Georgiana Cornelia Ispas, Violeta Purcar, Adriana Nicoleta Frone, Raluca Manea, Luminita Eugenia Wagner, and Mihai Anastasescu. "Fluorescent Silica Hybrid Film-Forming Materials Based on Salicylaldazine." Coatings 10, no. 12 (December 18, 2020): 1255. http://dx.doi.org/10.3390/coatings10121255.

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Fluorescent film-forming materials were obtained by embedding salicylaldazine (SAA) in silica hybrids generated by sol–gel processes from different silane precursors in acid catalysis. Tuned local environments for the fluorophore were generated in the hosting network by modifying silica sols with organic groups through the co-condensation of tetraethylortosilicate (TEOS) and different alkoxysilanes hydrolysis products. The photophysical properties of the luminescent hybrid films were studied in direct relationship with structural, textural, and surface properties and based on interactions between SAA species and the silica hosting network. Film-forming materials were studied in order to determine differences in absorption and fluorescence emission due to the environments around the fluorophore. The variations recorded in the fluorescence emission spectra of the hybrid films were related to interactions established between the fluorophore species and their sterically hindered surroundings of the host hybrid silica, where free molecular motions are restricted. The influence of the type and amount of network modifier and of the fluorophore loading on the transparency of the films and fluorescence intensity was also investigated. The study carried out led to the elucidation of the necessary conditions for obtaining luminescent film-forming materials with high luminescence intensity and transparency useful for the design of new light concentrators.

13

Yang, Jin Chul, Suck Won Hong, and Jinyoung Park. "Improving Surface Imprinting Effect by Reducing Nonspecific Adsorption on Non-Imprinted Polymer Films for 2,4-D Herbicide Sensors." Chemosensors 9, no. 3 (February 26, 2021): 43. http://dx.doi.org/10.3390/chemosensors9030043.

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Surface imprinting used for template recognition in nanocavities can be controlled and improved by surface morphological changes. Generally, the lithographic technique is used for surface patterning concerning sensing signal amplification in molecularly imprinted polymer (MIP) thin films. In this paper, we describe the effects of silanized silica molds on sensing the properties of MIP films. Porous imprinted poly(MAA–co–EGDMA) films were lithographically fabricated using silanized or non-treated normal silica replica molds to detect 2,4-dichlorophenoxyacetic acid (2,4-D) herbicide as the standard template. The silanized mold MIP film (st-MIP) (Δf = −1021 Hz) exhibited a better sensing response than the non-treated normal MIP (n-MIP) (Δf = −978 Hz) because the imprinting effects, which occurred via functional groups on the silica surface, could be reduced through silane modification. Particularly, two non-imprinted (NIP) films (st-NIP and n-NIP) exhibited significantly different sensing responses. The st-NIP (Δfst-NIP = −332 Hz) films exhibited lower Δf values than the n-NIP film (Δfn-NIP = −610 Hz) owing to the remarkably reduced functionality against nonspecific adsorption. This phenomenon led to different imprinting factor (IF) values for the two MIP films (IFst-MIP = 3.38 and IFn-MIP = 1.86), which was calculated from the adsorbed 2,4-D mass per poly(MAA–co–EGDMA) unit weight (i.e., QMIP/QNIP). Moreover, it was found that the st-MIP film had better selectivity than the n-MIP film based on the sensing response of analogous herbicide solutions. As a result, it was revealed that the patterned molds’ chemical surface modification, which controls the surface functionality of imprinted films during photopolymerization, plays a role in fabricating enhanced sensing properties in patterned MIP films.

14

Hutchings, Gregory S., Xin Shen, Chao Zhou, Petr Dementyev, Daniil Naberezhnyi, Inga Ennen, Andreas Hütten, et al. "Scalable production of single 2D van der Waals layers through atomic layer deposition: bilayer silica on metal foils and films." 2D Materials 9, no. 2 (February 10, 2022): 021003. http://dx.doi.org/10.1088/2053-1583/ac5005.

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Abstract The self-limiting nature of atomic layer deposition (ALD) makes it an appealing option for growing single layers of two-dimensional van der Waals (2D-VDW) materials. In this paper it is demonstrated that a single layer of a 2D-VDW form of SiO2 can be grown by ALD on Au and Pd polycrystalline foils and epitaxial films. The silica was deposited by two cycles of bis(diethylamino) silane and oxygen plasma exposure at 525 K. Initial deposition produced a three-dimensionally disordered silica layer; however, subsequent annealing above 950 K drove a structural rearrangement resulting in 2D-VDW. The annealing could be performed at ambient pressure. Surface spectra recorded after annealing indicated that the two ALD cycles yielded close to the silica coverage obtained for 2D-VDW silica prepared by precision SiO deposition in ultra-high vacuum (UHV). Analysis of ALD-grown 2D-VDW silica on a Pd(111) film revealed the co-existence of amorphous and incommensurate crystalline 2D phases. In contrast, ALD growth on Au(111) films produced predominantly the amorphous phase while SiO deposition in UHV led to only the crystalline phase, suggesting that the choice of Si source can enable phase control.

15

Yao, N., M. Trau, N. Nakagawa, and I. A. Aksay. "Self-Assembled and Micro-Patterned Mesoscopic Thin Films." Microscopy and Microanalysis 4, S2 (July 1998): 730–31. http://dx.doi.org/10.1017/s1431927600023771.

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Recently we have reported that the silica mesoscopic thin films can be formed at water/solid interface at room temperature. These self-assembled thin films are comprised of hexagonally packed nanotubules ((∼ 5 nm in diameter), with a percolating one-dimensional channel network that extends from one side of the film to the other. The solid substrate can affect strongly the overall alignment of assembly of surfactant micelle array. These films hold much promise for applications such as their use as orientated nanowires, sensor/actuator arrays and optoelectronic devices. Here, we report further electron microscopy studies of free standing thin film formed at air/water interface and patterned silica mesoscopic thin film formed with the guidance of micro-molding and electric field.We employ tetraethoxy silane (TEOS), dissolved in acidic solution, as a silicate source and cetyltrimethyl ammonium chloride (CTAC) as the templating surfactant. Typical molar ratios are 1 TEOS : 1.2 CTAC : 9.2 HC1 : 1000 H2O.

16

Vlaskin, V. I. "Nanocrystalline silicon carbide films for solar cells." Semiconductor Physics Quantum Electronics and Optoelectronics 19, no. 3 (September 30, 2016): 273–78. http://dx.doi.org/10.15407/spqeo19.03.273.

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17

Chien, Wen Chen, Yang Yen Yu, and Shih Yu Chen. "Synthesis and Characterization of Photopolymerized Poly(acrylic)/Monodispersed Colloidal Silica Hybrid Thin Films." Advanced Materials Research 47-50 (June 2008): 662–65. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.662.

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In this study, poly(acrylic)/silica hybrid thin films were prepared from various acrylic monomers and monodispersed colloidal silica with a coupling agent MSMA. The silica content in the hybrid thin films was varied from 0 to 50 wt%. The experimental results showed that the coverage area of silica particle by the MSMA decreased with increasing silica content and resulted in the aggregation of silica particle in the hybrid films. Thus, the silica domain in the hybrid films was varied from 20 to 35 nm by the different mole ratios of MSMA to silica. The results of SEM, TEM, and EA supported the above results. The analysis of FTIR and Raman spectra indicated that the degree of photopolymerization was very high. The prepared hybrid films from the crosslinked acrylic polymer moiety showed much better film uniformity, thermal stability and mechanical properties than those obtained from poly(methyl methacrylate). The refractive index decreased linearly with increasing the silica fraction in the hybrid films. Excellent optical transparency was obtained in the prepared hybrid films. These results showed that the prepared hybrid thin films had potential applications as passive films for optical devices.

18

Steglich, Martin, Thomas Kasebier, Ingmar Hoger, Kevin Fuchsel, Andreas Tunnermann, and Ernst-Bernhard Kley. "Black Silicon nanostructures on silicon thin films prepared by reactive ion etching." Chinese Optics Letters 11, S1 (2013): S10502. http://dx.doi.org/10.3788/col201311.s10502.

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19

Mathabani, Amirhossein, Ilkka Rytöluoto, Xiaozhen He, Eetta Saarimäki, Kari Lahti, Mika Paajanen, Rafal Anyszka, Wilma Dierkes, and Anke Blume. "Solution Modified Fumed Silica and Its Effect on Charge Trapping Behavior of PP/POE/Silica Nanodielectrics." Proceedings of the Nordic Insulation Symposium, no. 26 (August 8, 2019): 129–33. http://dx.doi.org/10.5324/nordis.v0i26.3292.

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Various dielectric nanocomposite materials are studied in the frame of the European Commission funded project GRIDABLE. This project has the aim to develop DC cable extruded insulation and medium and low voltage DC capacitor films exhibiting enhanced performance with respect to presently used materials. The nanocomposites intended for cable applications are polypropylene (PP)/polyolefin elastomer (POE) blends filled with surface modified nano-silica particles. The surface modification is carried out via the state-of-the-art solution method using a polar silane as the modifying agent. Thermally Stimulated Depolarization Current (TSDC) measurements were carried out in order to study the charge trapping behavior of the nanocomposite samples. TSDC results indicate that the addition of the treated nano-silica, for most cases, reduces the density of the deep traps significantly. The effect of the addition of silica nanoparticles - both modified and unmodified - on the crystallinity of the samples was studied using X-ray Diffraction (XRD). This is important as the charge trapping properties of the nanodielectrics can be affected by the degree of crystallinity. While more detailed studies are necessary, these results imply that the depth and the density of the deep trap states is profoundly influenced by the level of the silica modification i.e. the amount of the grafted silane on the silica surface.

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Olkhov, Anatoliy, and Gennady Zaikov. "Nanocomposites Based on Polyethylene and Nanocrystalline Silicon Films." Vestnik Volgogradskogo gosudarstvennogo universiteta. Serija 10. Innovatcionnaia deiatel’nost’, no. 6 (December 15, 2014): 63–72. http://dx.doi.org/10.15688/jvolsu10.2014.6.6.

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Li, Yu, Yi He Zhang, Bo Shen, and Feng Zhu Lv. "Preparation and Dielectric Properties of Polyimide Nanocomposite Films Based on Hollow Silica." Advanced Materials Research 217-218 (March 2011): 647–51. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.647.

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The hollow silica was fabricated by using monodispersed polystyrene microspheres as core template and tetraethyl orthosilicate as silica source, and polyimide nanocomposite films with different hollow silica concentration were successfully prepared via in situ polymerization. The hollow silica and nanocomposite films were characterized. The results indicated that the diameter of the hollow silica is around 30nm and the dielectric constant of the nanocomposite films enhance with the increase of the concentration of the hollow silica.

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Na, Moon Kyong, Hoy Yul Park, Dong Pil Kang, and Myeong Sang Ahn. "Properties of Nano-Hybrid Sol-Gel Coating Films Synthesized with Colloidal Silica and Organoalkoxy Silanes." Materials Science Forum 569 (January 2008): 69–72. http://dx.doi.org/10.4028/www.scientific.net/msf.569.69.

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Three kinds of colloidal silica (CS)/silane sol were prepared. Sols are involved with the kinds of silane with different organic group. Methyltrimethoxysilane (MTMS) has the three methoxy groups and a methyl group. γ-Glycidoxypropyltrimethoxysilane (GTMS) has the three methoxy groups and a bulky epoxy group. GTMS was added to two sols with different amount. When sol reacted for 10 days, viscosity increased dramatically. Trasnmittance of sols reacted for 10 days decreased rapidly, too. It indicated the stability of sol degraded. Sol-gel coating films were formed on glass substrate using spin coating procedure with reaction time for 10 days. Coating films were flat and transparent without cracking. CS/MTMS coating films showed high contact angle. When large amount of GTMS was added, contact angle decreased due to its epoxy group. No thermal degradation of CS/MTMS coating film occurred up to 600 oC. CS/MTMS/GTMS coating film degraded at 400 oC for decomposition of epoxy group which has long organic chain which easily degraded by the thermal shock.

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Yu, Yang Yen, Wen Chen Chien, and Tsung Wei Tsai. "Microstructure and Properties of Polyimide /Monodispersed Colloidal Silica Hybrid Films Prepared by Sol–Gel Process." Advanced Materials Research 47-50 (June 2008): 650–53. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.650.

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In this study, the polyimide-silica hybrid thin films, 6FDA-6FpDA-4ABA/SiO2 (FS0-FS50) were prepared from the 12nm colloidal silica and polyimide bearing acid endgroups. During the preparation, without any additional coupling agents or chelating ligands were used. The strong interactions between carboxylic acid coordinating with silica were believed to prevent the macrophase separation. TGA analysis showed that the thermal decomposition temperatures (Td) incresased with increasing the silica content. UV-VIS spectra showed that the cutoff wavelength of prepared hybrid films could be tunable through the silica content. The n&k analysis showed that the refractive index (n) of PS hybrid films were in the range of 1.575-1.479, which could be controlled by the silica content. The extinction coefficients (k) are almost zero in the wavelength range of 300–900 nm, indicating the prepared hybrid films have an excellent optical transparency in the UV and visible region. TEM images showed that the particle size of silica in the hybrid thin films could be effectively controlled. The results of SEM and AFM showed that all the prepared hybrid films have a good planarity. It demonstrated that the prepared polyimide-silica hybrid thin films have an excellent film formability and planarity.

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Kubo, Tomoko, Eisuke Tadaoka, and Hiromitsu Kozuka. "Formation of silica coating films from spin-on polysilazane at room temperature and their stability in hot water." Journal of Materials Research 19, no. 2 (February 2004): 635–42. http://dx.doi.org/10.1557/jmr.2004.19.2.635.

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Spin-coating was conducted on single-crystal silicon substrates using a xylene solution of perhydropolysilazane (PHPS) to obtain 0.14-μm-thick PHPS films. The PHPS films obtained were suspended over various acidic and basic solutions at room temperature so that they were exposed to the vapors from the solutions. PHPS-to-silica film conversion was studied by infrared absorption spectroscopy, and the stability of the exposed films in hot water was examined by soaking the films in 80 °C water. The as-deposited PHPS films were found to be dissolved in water. When the PHPS films were suspended over water, the films were partially converted into silica, but the resultant film had low stability in hot water. Higher degrees of PHPS-to-silica conversion and higher stabilities in hot water were found on exposing the PHPS films to basic or acidic vapors. Exposure to highly basic vapors from aqueous solutions of ammonia and ethylamine was significantly effective in PHPS-to-silica film conversion, which provided silica thin films with high stability in hot water.

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Loughlani, Rayane-Ichrak, Alonso Gamero-Quijano, and Francisco Montilla. "Electroassisted Incorporation of Ferrocene within Sol–Gel Silica Films to Enhance Electron Transfer." Molecules 28, no. 19 (September 28, 2023): 6845. http://dx.doi.org/10.3390/molecules28196845.

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The sol–gel method is a straightforward technique that allows electrode modification with silica thin films. Furthermore, the silica pores could be functionalized to enhance the electrical conductivity and reactivity of the silica films. In this context, silica thin films were functionalized with ferrocene species. This functionalization was performed by electroassisted accumulation, generating a micro-structured composite electrode (Fc@SiO2 electrode). These modified electrodes were characterized by electrochemical and spectroelectrochemical methods, pointing out that ferrocene species were confined with high stability within the microporous silica thin film, demonstrating the good adsorption capacity of the silica. While the spectroelectrochemical characterization indicates that only a fraction of the confined species within the silica films were electroactive, the electrochemical results demonstrate that the Fc@SiO2 film enhances the electrochemical response of cytochrome c in a solution, which gives rise to further applications of these films for redox-controlled release and electrochemical detection of other redox-active proteins.

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Zhang, Yi He, Qing Song Su, Li Yu, Hong Zheng, Hai Tao Huang, Guo Ge Zhang, Ying Bang Yao, and Helen Lai Wah Chan. "Study on the Dielectric Properties of Hybrid and Porous Polyimide-Silica Films." Advanced Materials Research 47-50 (June 2008): 973–76. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.973.

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A sol-gel process was used to prepare polyimide-silica hybrid films from the polyimide precursors and TEOS in N,N- dimethyl acetamide, then the hybrid film was treated with hydrofluoric acid to remove the dispersed silica particles, leaving pores with diameters between 80nm to 1µm, depending on the size of silica particles. The structure and dielectric constant of the hybrid and porous films were characterized by FTIR,SEM. The porous films displayed relatively low dielectric constant compared to the hybrid polyimide-silica films.

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Bi, Wen Yue, Li Wang, Xin Gang Yu, Xing Dong Zhang, Hong Quan Bao, and Hui Feng Zhao. "Effect of Heat Treatment on Coloration of Ag Doped TiO₂-SiO₂ Films." Key Engineering Materials 336-338 (April 2007): 1793–95. http://dx.doi.org/10.4028/www.scientific.net/kem.336-338.1793.

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Silver doped titania-silica films were fabricated by two-step route of sol-gel method using Ti(OC4H9)4, Si(OC2H5)4 and AgNO3 as the precursor materials. The films were annealed at temperature from 350°C to 560°C for a period of time ranging from 15min to 90 min. Optical properties of the films were characterized by UV-visible spectroscopy and the state of silver in the titania-silica films was investigated by XRD patterns. It was found that the annealing temperature and time have considerably influenced the coloration of the films, and with the increase of annealing temperature the [111] orientation of silver crystal occurred which make the color of silver doped titania-silica films deepened. The coloration stability of the silver doped titania-silica films was also investigated.

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Kang, Young Taec, Jin Kook Lee, and Dong Pil Kang. "Properties of Organic/Inorganic Hybrid Material Synthesized from Acrylic Resin and Silane-Terminated CS." Materials Science Forum 544-545 (May 2007): 809–12. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.809.

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Organic/inorganic hybrid materials synthesized from acrylic resin and silane-terminated colloidal silica(CS). The silane-terminated CS was prepared in variation with the kind of silane to CS. The CS treated with methyltrimethoxysilane(MTMS) and then treated with vinyl trimethoxysilane(VTMS), 3-glycidoxypropyltrimethoxysilane(ATMS) or 3-methacyloxypropyl trimethoxysialne(ETMS) by sol-gel method, respectively. The variation of silane-terminated CS and acrylic resin were hybridized by thermal-polymerization. Thin films of organic/inorganic hybrid materials were prepared using spin coater on the glass and aluminum sheets. Their contact angle, surface electric resistivity and thermal resistance improved with the amount of silaneterminated CS. The contact angle and surface electric resistivity of hybrid thin film with VTMS were enhanced. The surface of hybrid thin film with VTMS was homogeneous through FE-SEM.

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Xiaowei Zhang, Xiaowei Zhang, Tao Lin Tao Lin, Xiaofan Jiang Jun Xu (Mh) Xiaofan Jiang Jun Xu (Mh), Jianfeng Liu Jianfeng Liu, Ling Xu Ling Xu, and Kunji Chen Kunji Chen. "Photoluminescence from Er3+ ion and SnO2 nanocrystal co-doped silica thin films." Chinese Optics Letters 10, no. 9 (2012): 091603–91606. http://dx.doi.org/10.3788/col201210.091603.

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Horikawa, Hajime, Takashi Ogihara, Akio Shimomura, and Junko Shimomura. "Preparation and Characterization of Silica Film on PBT Substrate by Sol-Gel Method Using Perhydropolysilazane." Key Engineering Materials 421-422 (December 2009): 161–64. http://dx.doi.org/10.4028/www.scientific.net/kem.421-422.161.

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Silica, silica/polymethylmethacrylate (PMMA) hybrid, and silica-particle blend silica films were successfully prepared on polybutylene terephtalate (PBT) substrate by dip coating using perhydropolysilazane (PHPS) as a silica source. The effect of thermal treatment on conversion from PHPS to silica was investigated in detail by scanning electron microscopy and Fourier transform infrared spectroscopy. Mechanical properties of silica and silica/PMMA hybrid thin films also were examined by the pencil scratch hardness tests.

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Park, Oun-Ho, Se-Young Seo, Ji-In Jung, Jae Young Bae, and Byeong-Soo Bae. "Photoluminescence of mesoporous silica films impregnated with an erbium complex." Journal of Materials Research 18, no. 5 (May 2003): 1039–42. http://dx.doi.org/10.1557/jmr.2003.0143.

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Transparent mesoporous silica films were prepared by sol-gel spin coating on silicon wafers at room temperature. An erbium complex, erbium tris 8-hydroxyquinoline (ErQ), was homogeneously impregnated into the pores of the mesoporous silica films, and its concentration was easily controlled by using a solution immersing technique. The ErQ-impregnated mesoporous silica films show a room-temperature photoluminescence at 1.5 µm.

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Ushijima, Sota, and Toshiyuki Ikoma. "Fabrication of Mesoporous Silica Thin Film Platforms for Surface Reaction with Surface Plasmon Resonance." Key Engineering Materials 758 (November 2017): 24–28. http://dx.doi.org/10.4028/www.scientific.net/kem.758.24.

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Mesoporous silica thin films were fabricated on gold substrates with a sol-gel method including a cationic surfactant. The interface of gold and silica thin films was fixed with a mercaptosilane. The surface roughness of the thin films and their grain sizes of silica were both increased with the elimination of the cationic surfactant and polyethylene glycol (PEG) modification on its surface. The surface reaction, adsorption of bovine serum albumin (BSA), was monitored with surface plasmon resonance (SPR). Although the adsorption amount of BSA at 1 mg/mL were 7.9 ng/cm2 on the mesoporous silica, the PEG modification can completely desorb BSA. The mesoporous silica thin films on gold substrates fabricated will be a good platform for analyzing surface reaction.

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Guo, Pei Tao. "Improvement in Mechanical Property of SiO₂ Films Prepared by Sol-Gel." Advanced Materials Research 744 (August 2013): 269–72. http://dx.doi.org/10.4028/www.scientific.net/amr.744.269.

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Silica films prepared by the base catalyzed sol–gel process show poor mechanical property. In this study, silica anti-reflective films with good mechanical property have been prepared by the catalyzed sol–gel process with dimethyl formamide added as drying control chemical additives. The silica sol was first dip deposited onto substrate to form films on both sides of the substrate and then subjected to thermal treatment. After thermal treatment, the film was achieved due to the formation of porous structure in the resultant film as a result of decomposing tetraethylorthosilicate and dimethyl formamide. Nano-indenter measurement shows that the Young’s modulus and hardness of base catalyzed films are 10-20GPa and 0.25-0.55GPa, respectively. But the films added with dimethyl formamide are much better than those films derived from base-catalyzed silica sols, the Young’s modulus and hardness are 32-39GPa and 1.22-1.47GPa, respectively. The good mechanical properties make such films potential in both military and civil applications.

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Qin, Xiao Gang, Sheng Sheng Yang, Liang Shi, An Xing, and Yuan Gao. "Preparation of Silica Hybrid Films on PMMA by Sol-Gel and Solvothermal Methods." Advanced Materials Research 785-786 (September 2013): 877–80. http://dx.doi.org/10.4028/www.scientific.net/amr.785-786.877.

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Using solvothermal method to modify the surface of polymethyl methacrylate (PMMA), the silica films were prepared on it via sol solution and solvothermal treatment. Silica-based hybrid sol solutions were synthesized from tetraethoxysilane (TEOS) and methyltrimethoxysilane (MTMS). The obtained silica-based hybrid films consisted of the uniform particles around 40 nm in diameter observed by atomic force microscopy (AFM). The optical property was evaluated by the UV-Vis absorption spectra. The silica hybrid films prepared through this process showed good optical transmittance.

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Zhang, Xin, Lei Mao, and Jing Ma. "An Investigation on Surface Sol-Gel Silica Film." Advanced Materials Research 787 (September 2013): 65–70. http://dx.doi.org/10.4028/www.scientific.net/amr.787.65.

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Ultrathin silica films were grown on polyimide substrates using surface sol-gel method and the film growth process was characterized by ellipsometry, atomic force microscopy, X-ray photoelectron spectroscopy, Fourier transformed infrared spectroscopy. The polyimide substrates were pretreated by chemical process for promoting the growth of silica film. On the modified polymide surface, the growth of silica films shows an island-like growth type, but not a lay-by-lay process. Moreover, the deposited silica films are not a strict SiO2 film.

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Yu, Yang Yen, Wen Chen Chien, and Chiung Lin Lai. "Preparation and Patterning of Optical Hybrid Thin Films Based on Photosensitive Polyimide and Monodispersed Colloidal Silica." Advanced Materials Research 47-50 (June 2008): 654–57. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.654.

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In this study, optical hybrid thin films were prepared from photosensitive poly(4,4-(hexafluoroisopropyl- idenediphthalic anhydride)-co-oxydianiline) (6FDA-ODA)/MDAE and monodispersed colloidal silica with a coupling agent. It was a combination of the sol–gel reaction, thermal polymerization and spin coating. The coupling agents were 3-methacryloxypropyl trimethoxysilane (MPTMS) or (4-vinylphenethyl)trimethoxysilane (VPTMS). The silica content in the hybrid thin films was varied from 0 to 8.6wt%. The coupling agent and the silica domain were designed primarily for reducing the volume shrinkage and enhancing the thermal properties, respectively. The retention of MDAE in the prepared hybrid films is supported by X-ray photoelectron spectroscopy (XPS). The silica domain significantly enhanced the thermal properties of the prepared hybrid films in comparison with parent fluorinated polyimide. The prepared hybrid materials also exhibited reduced refractive index by increasing the silica content. The results of SEM showed the prepared photosensitive hybrid materials could obtain lithographical patterns with a good resolution. These results indicated that the newly prepared photosensitive polyimide/colloidal silica hybrid thin films had potential applications for optical devices.

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Chauhan, Shobhit Singh, A. L. Sharma, and R. V. Jasra. "Photofunctions of Dye Encapsulated Nanostructured Silica Films Suitable for Optical Filter Application." Materials Science Forum 757 (May 2013): 257–69. http://dx.doi.org/10.4028/www.scientific.net/msf.757.257.

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The development of nanostructured silica thin films encapsulated with organic functionalities has been an area of active research. The functionalization of films can be done by post doping, covalent or non-covalent methodology. The materials researchers were interested to study and understand the nature of interactions existing in the host silica network and associated physicochemical properties of the derived films. The photofunction imparted films have been explored for chemical and biological sensing applications. In the presented work, an optical filter application based on dye encapsulated nanostructured silica films is reported. To the best of our knowledge, we report for the first time cresol red- a sulfonephthalein dye based nanostructured silica film acting as optical filter. These supported films were found to resemble optical notch filter with center wavelength (CWL) at 432 nm and optical density of 0.05. The films were formed on glass slides by spin coating technique. The coating solution was prepared by template assisted sol-gel method. The films were studied for their physical and chemical characteristics using an array of instrumental techniques.

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Dhapte, Vividha, Shivajirao Kadam, Varsha Pokharkar, Pawan K. Khanna, and Vishwas Dhapte. "Versatile SiO2 Nanoparticles@Polymer Composites with Pragmatic Properties." ISRN Inorganic Chemistry 2014 (January 29, 2014): 1–8. http://dx.doi.org/10.1155/2014/170919.

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In the present work, we report the fabrication of silica nanoparticles embedded polymeric (SiO2 nanoparticles@polymer) composite films for numerous traits like texture, folding endurance, crystallinity, size, thermal behavior, spectral analysis, and bioactivity. Significant facets of bulky, inert, inorganic materials are known to burgeon out due to the high surface area of nanosized particles. Nature and proportion of silica nanoparticles as well as polymers exhibited remarkable impact on the fabrication and quality of casted films. Hydrophilic silica nanoparticulate-PVA films depicted better mechanical properties like thermal plus photo stability. Hydrophobic silica nanoparticulate-PMMA films showed qualities of a robust, active, thermostable, antimicrobial material that could resist extreme storage and processing conditions. Overall, these metal oxide nanoparticle-polymer composite films possess qualities reflecting their potential in food, pharmaceutical, and cosmetic industry.

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Julve, Daniel, Miguel Menéndez, Jorge Pérez, and José Ramos. "MICRODISPERSION OF SILICA IN TIRE TREAD COMPOUNDS ABOVE THE PERCOLATION THRESHOLD BY TEM IMAGE MEASUREMENTS." Rubber Chemistry and Technology 84, no. 1 (March 1, 2011): 74–87. http://dx.doi.org/10.5254/1.3544676.

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Abstract Dispersion values in rubber are usually subjective values or the result of a comparison against empirical standards. we present a method to measure the filler dispersion in rubber compounds reinforced beyond the percolation threshold. Applying this method to an actual technical formulation with high filler loading, the dispersability of different silica grades, as well as the effect of coupling agent concentration in the dispersion has been showed. To carry out the measurements, the finished rubber is sliced in very thin films and then examined with transmission electron microscopy (TEM). Those images are processed to obtain information on the filler aggregation properties. As expected, the highly dispersible silica presents a smaller aggregate size and more contact surface with the rubber than the conventional and easily dispersible grades. In addition, increasing the amount of silane does diminish the aggregate size but with a lesser effect than that of the silica grade.

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Myung, In Hye, Hoy Yul Park, Moon Kyong Na, Myeng Sang Ahn, and Dong Pil Kang. "Characteristics of Thin Films Synthesized from Colloidal Silica-Silane Sols." Molecular Crystals and Liquid Crystals 463, no. 1 (January 22, 2007): 213/[495]—220/[502]. http://dx.doi.org/10.1080/15421400601027940.

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Zhang, Rongfei, Xiangyou Wang, Juan Wang, and Meng Cheng. "Synthesis and Characterization of Konjac Glucomannan/Carrageenan/Nano-silica Films for the Preservation of Postharvest White Mushrooms." Polymers 11, no. 1 (December 21, 2018): 6. http://dx.doi.org/10.3390/polym11010006.

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In this study, the konjac glucomannan (KGM)/carrageenan (KC)/nano-silica film was prepared and characterized by scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD). The preservation quality of white mushrooms (Agaricus bisporus) packed using the films was also determined. The nano-silica dosage was found to affect the properties of the nanocomposite KGM/KC films. The results indicated that the properties of the films were significantly improved with the addition of nano-silica. The water vapor permeability, water solubility, moisture absorption, and light transmittance of KGM/KC/nano-silica films were significantly affected by the nano-silica dosage. In this study, the optimal nano-silica dosage to incorporate into the film in order to achieve excellent performance was 0.3%. Strong intermolecular hydrogen bonds were also observed between KGM/KC and nano-silica in the KGM/KC/nano-silica film by FTIR. In addition, the KGM/KC/nano-silica film markedly reduced the browning index, delayed the weight loss and softening, and extended the shelf life of mushrooms during storage at 4 °C. The KGM/KC film modified using nano-silica can provide a potential method for improving the preservation quality of white mushrooms during storage.

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Zhou, Qi, Guang Xia Sun, Ping Zhao, and Hong Yan Liu. "Corrosion Resistance of KH-550 and KH-567 Composite Silane Films on Cast Aluminum Alloy." Advanced Materials Research 460 (February 2012): 90–93. http://dx.doi.org/10.4028/www.scientific.net/amr.460.90.

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The silane films are fabricated by dipping cast aluminum alloy in silane solution, then curing films. The corrosion resistance of single silane film, composite silane film is compared with phosphating film through acid dropping test, salt water immersion test and electrochemical impedance test (EIS), the results shows that the silane films are obviously superior to the phosphating films in terms of the corrosion resistance of acid solution and neutral salt solution, particularly the corrosion resistance of composite silane films is much better than sigle silane films; corrosion polarization curves show that the corrosion tendency of KH550+KH567 composite silane film is minimum, corrosion rate is yet minimal, corrosion process of this silane films is controled by diffusion step. The corrosion process of uncoated aluminum substrate, KH550 silane films, phosphating films are controlled by electrochemical step. The impedance of phosphate films are lower than the silane films. Appropriate silane treatment can effectively improve adhesion between the coating and the Al substrate. The adhesion between silane film and paint film is firmer than the phosphate film, so silane film is an excellent replacement to phosphate film for painting pre-treatment.

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Na, Moon Kyong, Myeong Sang Ahn, and Hoy Yul Park. "Properties of Sol-Gel Coating Film from Colloidal Silica-Silane Sol." Materials Science Forum 544-545 (May 2007): 813–16. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.813.

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Two kinds of colloidal silica(CS)/silane sol solutions were prepared. Two sol solutions are involved with the kinds of silane such as methyltrimethoxysilane(MTMS) and -Glycidoxypropyl trimethoxysilane(ETMS) using LS CS. MTMS was added to two sol solutions. Whether ETMS was added or not, two kinds of sol solutions were synthesized. Using two kinds of sol solutions, sol-gel coating films were formed on glass substrates via dip-coating process. Here, seasoning effect of for enhancing properties of sol-gel coating layer on glass was investigated while such sol-gel solutions were left for 7days. Also, their properties such as surface free energy, roughness, thermal property, potential hardness and elastic portion were characterized in order to understand the effect of addition of ETMS. In this case of LS/MTMS sol, the coating film had low surface free energy and more enhanced flat surface than that of the case of LS/MTMS/ETMS sol. ETMS forms hydrophilic hydroxyl group in sol solution, then surface free energy of LS/MTMS/ETMS coating film increased. In the beginning of reaction sol solution seemed to be unstable, but 4days later their coating film properties such as surface free energy and roughness enhanced. The elastic portion of coating films obtained from LS/MTMS/ETMS sol increased with addition of ETMS, but thermal stability decreased.

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He, Jian Yun, Jin Ping Xiong, and Bing Qian Xia. "UV-Curable Organic-Inorganic Hybrid Films Based on Epoxynorbornene Linseed Oils." Advanced Materials Research 217-218 (March 2011): 294–99. http://dx.doi.org/10.4028/www.scientific.net/amr.217-218.294.

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Epoxynorbornene linseed oil (ENLO) is a new kind of epoxide from renewable sources. An UV-curable organic/inorganic hybrid films using epoxynorbornene linseed oils (ENLO) and surface treated nano-silica were formulated. The mechanical properties，thermal properties and coating properties of the ENLO /silica coatings were evaluated as the function of nano-silica content. The results indicated that after incorporating the nano-silica, the strength, modulus and glass transition temperature of the hybrid films enhanced, while the elongation at break decreased. The nano-silica also improved the hybrid coating properties such as pencil hardness, solvent resistance and surface wetting properties. The morphology observation of the films by atomic force microscopy (AFM) showed that the average silica particle size was ~ 70 nm and the particles were well-dispersed in the organic phase.

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Silviana, S., Gelbert Jethro Sanyoto, and Adi Darmawan. "PREPARATION OF GEOTHERMAL SILICA GLASS COATING FILM THROUGH MULTI-FACTOR OPTIMIZATION." Jurnal Teknologi 83, no. 4 (June 7, 2021): 41–49. http://dx.doi.org/10.11113/jurnalteknologi.v83.16377.

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Glass coating films have been developed by many researchers in recent years. However, mass commercialization of this technology is still inefficient, and optimal methods are needed to produce affordable products. This paper introduces a film preparation method through, which a coating film is superimposed on silica glass by utilizing geothermal waste, a byproduct of geothermal power plants. Geothermal waste has been used as a silica precursor and modified using several silylation agents such as methyltriethoxysilane (MTMS), hexamethyldisilazane (HMDS), polydimethylsiloxane (PDMS), and surface-active agent (surfactant) cethyltrimethylammoniumbromide (CTAB). Design Expert 8.0.6 is used for optimization to find the desired product at the concentration of specific precursors and silane agents using contact angle responses. A model that consists of statistically significant variables can be generalized to a broad data range. The results of this study indicate that the glass surface coated with modified silica produces hydrophobic glass with contact angles up to 90° using the MTMS silylation agent.

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Uysal, Bengü Özuğur, and Fatma Z. Tepehan. "Determination of growth kinetics and size dependent structural, morphological, optical characteristics of sol-gel derived silica nanoparticles in silica matrix." Materials Science-Poland 37, no. 1 (March 1, 2019): 16–24. http://dx.doi.org/10.2478/msp-2019-0010.

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AbstractNanocomposite silica thin films made using the sol-gel method were studied. The nano-silica films were prepared using a mixture of tetraethyl orthosilicate (TEOS), deionized water, ethanol, and ammonia solution. To control the growth of the particles inside the film, the nanocomposite silica film was prepared using a mixture of the nano-silica sol and the silica sol. The change in the particle size with the heat treatment temperature ranging from 450 °C to 1100 °C was investigated. X-ray diffraction (XRD), atomic force microscopy (AFM), scanning electron microscopy (SEM), NKD (refractive index-N, extinction coefficient-K, and thickness-D) and ultraviolet-visible (UV-Vis) spectrophotometry were used for characterization purposes. The XRD studies showed that the nano-silica thin films were amorphous at all annealing temperatures except for 1100 °C. The_-cristobalite crystal structure formed at the annealing temperature of 1100 °C. Optical parameters, such as refractive indices and extinction coefficients, were obtained using the NKD analyzer with respect to the annealing temperature of the films. The activation energy and enthalpy of the nanocomposite silica film were evaluated as 22.3 kJ/mol and 14.7 kJ/mol, respectively. The cut-off wavelength values were calculated by means of extrapolation of the absorbance spectra estimated using the UV-Vis spectroscopy measurements. A red shift in the absorption threshold of the nanocomposite silica films indicated that the size of the silica nanoparticles increased with an increase of the annealing temperatures from 450 °C to 900 °C, and this confirms the quantum confinement effect in the nanoparticles.

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Alam, S. M. M. "Preparation and Performance of Nano-hybrids Synthesized from Polyimide and Silica." Journal of Scientific Research 2, no. 1 (December 29, 2009): 99–107. http://dx.doi.org/10.3329/jsr.v2i1.2733.

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Polyimide (PI)-inorganic like silica hybrid films were successfully prepared to combine the good performances of silica like tensile modulus, thermal stability etc. into organic PI. Polyamic acid (PAA), precursor of PI, was prepared from 3, 3′, 4, 4′-biphenyltetracarboxylic dianhydride (BPDA), p-phenylediamine (PDA) and in-situ formed silica was formed into PAA from tetraethoxysilane (TEOS) through in-situ sol-gel process. The films were transparent and became translucent in presence of up to 10% inorganic contents. The chemical structures were characterized by Fourier transform infrared spectroscopy (FTIR). The morphology of the films was investigated by scanning electronic microscopy (SEM). Differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), stress-strain tests and dynamic mechanical analysis (DMA) were used to evaluate the performances of the films. The results indicated that the glass-transition temperatures (Tg) and decomposition temperatures of the PI-silica hybrid films were higher than those of pristine PI. Tensile modulus, tensile strength of PI increased prominently in presence of small amount (1%) of silica in PI-silica hybrid. Keywords: Polyimide; Hybrid; Sol-gel process. © 2010 JSR Publications. ISSN: 2070-0237 (Print); 2070-0245 (Online). All rights reserved. DOI: 10.3329/jsr.v2i1.2733 J. Sci. Res. 2 (1), 99-107 (2010)

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Zhu, Houbin, Qingyun Li, Huangpu Han, Zhenyu Li, Xiuquan Zhang, Honghu Zhang, and Hui Hu. "Hybrid mono-crystalline silicon and lithium niobate thin films [Invited]." Chinese Optics Letters 19, no. 6 (2021): 060017. http://dx.doi.org/10.3788/col202119.060017.

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Manakov, S. M., and Ye Sagidolda. "Investigation of the physical properties of nanoscale porous silicon films." Physical Sciences and Technology 2, no. 1 (2015): 4–8. http://dx.doi.org/10.26577/2409-6121-2015-2-1-4-8.

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Yu, Yang Yen, Wen Chen Chien, and Shih Ting Chen. "Preparation of Nanoporous Mondispersed Silica Nanoparticles Films Using Poly(styrene)- Block-Poly( 2-Vinyl Pyridine) as Template." Advanced Materials Research 47-50 (June 2008): 646–49. http://dx.doi.org/10.4028/www.scientific.net/amr.47-50.646.

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Nanoporous silica films were prepared through the templating of amphiphilic block copolymer, poly(styrene-2-vinyl pyridine) (PS-b-P2VP), and colloidal silica nanoparticles. The experimental and theoretical studies suggested that the intermolecular hydrogen bonding was existed between the colloidal silica nanoparticles and PS-b-P2VP. The miscible hybrid and the narrow thermal decomposition of the PS-b-P2VP led to nanopores in the prepared films from the results of TGA, AFM, and TEM. The effects of the loading ratio and P2VP chain length on the morphology and properties of the prepared nanoporous silica films were investigated. The TEM and AFM studies showed that the uniform pore morphology with pore size 10-15nm was prepared from a modest porogen loading level for the optimum intermolecular hydrogen bonding. The refractive index and dielectric constant of the prepared nanoporous films decreased with an increase in PS-b-P2VP loading. On the other hand, the porosity increased with an increasing PS-b-P2VP loading. This study demonstrated a methodology to control pore morphology and properties of the nanoporous silica films through the templating of PS-b-P2VP.

Journal articles on the topic 'Films de silice'

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