Relevant bibliographies by topics / Silica gel

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Academic literature on the topic 'Silica gel'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 March 2023

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Journal articles on the topic "Silica gel"

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Fathurrahman, Muhammad, Usep Suhendar, Ani Iryani, Diana Widiastuti, Sherin Nurhafidza Ahmad, and Esya Juniar. "Sintesis dan Karakterisasi Komposit Eugenol-Silika Gel dari Abu Tongkol Jagung serta Analisis Antibakteri dan Daya Serap terhadap Air." ALCHEMY Jurnal Penelitian Kimia 18, no. 1 (February 2, 2022): 10. http://dx.doi.org/10.20961/alchemy.18.1.47161.10-18.

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<p dir="ltr">Tongkol jagung mempunyai kandungan silika yang cukup tinggi, yaitu 67,41% dari total abunya yang memungkinkan untuk dimanfaatkan untuk pembuatan komposit eugenol-silika gel. Penelitian ini bertujuan mempelajari pembuatan komposit eugenol-silika gel dengan bahan dasar abu tongkol jagung menggunakan metode sol gel, diikuti dengan analisis daya serap air dan aktivitas antibakteri terhadap <em>E. coli</em> dan <em>S. aureus</em>. Komposit eugenol-silika gel ini dikarakterisasi menggunakan <em>Fourier Transform Infrared</em> (FTIR), <em>X-ray Diffraction</em> (XRD), <em>Scanning Electron Microscope</em> (SEM) dan <em>Thermogravimetric Analysis</em> (TGA). Hasil karakterisasi dengan FTIR menunjukkan bahwa sintesis komposit eugenol-silika gel berhasil dilakukan. Analisis menggunakan XRD menunjukkan bahwa komposit eugenol-silika gel memiliki bentuk amorf. Karakteristik mikrostruktur menggunakan SEM menunjukkan permukaan yang tidak merata dan terdapat gumpalan (<em>cluster</em>) yang menandakan adanya bentuk butiran-butiran yang beragam berbentuk bulat atau globular pada permukaan komposit eugenol-silika gel. Analisis termogravimetri yang dilakukan sampai suhu 600 °C menunjukkan total prosentase pengurangan massa komposit eugenol silika-gel sebesar 13,10%. Daya serap air komposit eugenol-silika gel memiliki nilai persentase yang lebih tinggi dibandingkan dengan silika gel <em>food grade</em>. Akan tetapi, komposit eugenol-silika gel tidak memiliki aktivitas antibakteri terhadap <em>E. coli</em> dan <em>S. aureus</em>.</p><div><p dir="ltr"><strong>Synthesis and Characterization of Eugenol-Silica Gel Composite from Corn Cob Ash and Analysis of Antibacterial and Water Absorption. </strong>Corn cobs have high silica content, specifically 67.41% of the total ash, possibly used for eugenol-silica gel composite manufacture. This study aims to synthesize eugenol-silica gel composite with corn cob ash as the base material by sol gel method, followed by analyzing water absorption and antibacterial activity against <em>E. coli</em> and <em>S. aureus</em>.<strong> </strong>The method used is the sol-gel method. This eugenol-silica gel composite was characterized using Fourier Transform Infrared (FTIR), X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), and Thermogravimetric Analysis (TGA). The characterization results by FTIR showed that the synthesis of the eugenol-silica gel composite was successfully carried out. Analysis using XRD showed that the eugenol-silica gel composite had an amorphous form. Microstructural characteristics using SEM showed an uneven surface and clusters indicating the presence of various globular or spherical shapes on the surface of the eugenol-silica gel composite. Thermogravimetric analysis carried out until a temperature of 600 °C showed the total percentage reduction in mass of the eugenol silica-gel composite was 13.10%. The water absorption of eugenol-silica gel composite has a higher percentage value than food-grade silica gel. However, eugenol-silica gel composite has no antibacterial activity against <em>E. coli</em> and <em>S. aureus. </em></p></div>
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Pijarn, Nuchanaporn, and Pichit Galajak. "New Insight Technique for Synthesis of Silica Gel from Rice Husk Ash by Using Microwave Radiation." Advanced Materials Research 1025-1026 (September 2014): 574–79. http://dx.doi.org/10.4028/www.scientific.net/amr.1025-1026.574.

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Silica gel is the chemical substance that has many good advantages such as absorbed moisture, porosity, small diameter, high surface area, and lightweight. It was synthesized by using rice husk ash via sol – gel heating in the microwave technique. The objectives in this work compose of synthesis silica gel by using the microwave technique before characterizatization. This raw material was archived from rice husk ash, obtained from agricultural waste. The silica gel, synthesized by conventional method (CVM) and commercial silica gel (COM), was also studied for comparison purposes. The results showed that successfully synthesized the silica gel by sol - gel technique using microwave. The XRD pattern of silica gel enhanced from this method was not sinificantly different as compared with CVM and COM methods. And the physical properties of this technique could be debated. The particle size of silca gel was determined by zetasizer and it was approxmately 50-70 nm. The pore size diameter, pore volume, and specific surface area of silica gel were calculated by Flowsorb II and a Quantachrome Autosorp-1. The pore size diameter, pore volume, and specific surface area of silica gel are 10-30 nm, 0.7-1.0 cm3/g, and 400-700 m2/g, respectively. Consequently, this work is considered to be the waste to make useful, and a great way to save energy and time in the silica gel synthesis.
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Purwanto, Agus Salim, Taslimah Taslimah, and Sriatun Sriatun. "Sintesis dan Karakterisasi Silica Gel dari Tetraetilortosilikat (TEOS) Menggunakan Surfaktan Polyethylene Glycol (PEG) 6000 dalam Kondisi Basa." Jurnal Kimia Sains dan Aplikasi 15, no. 1 (April 1, 2012): 1–6. http://dx.doi.org/10.14710/jksa.15.1.1-6.

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Penelitian tentang sintesis silika gel dari tetraetilortosilikat (TEOS) menggunakan surfaktan polyethylene glicol (PEG) 6000 dalam kondisi basa telah dilakukan. Penelitian ini bertujuan untuk menentukan pH optimum pembentukan gel tercepat untuk sintesis silica gel dan menentukan karakter silika gel hasil sintesis. Sintesis silica gel dilakukan dengan mencampurkan tetraetilortosilikat (TEOS), etanol, aquades, NH4OH dan polietilen glikol (PEG) 6000. Penelitian ini dilakukan variasi pH 8-10 dan variasi konsentrasi PEG 6000 yaitu 0,01 g/100 mL; 0,03 g/100 mL; 0,06 g/100 mL. Silika gel hasil sintesis dikarakterisasi dengan spektrofotometer inframerah (FTIR), difraksi sinar-X (XRD) dan BET surface area analyzer. Diperoleh bahwa pH 9 sebagai pH optimum untuk pembentukan gel. Hasil analisis difraksi sinar-X (XRD) menunjukkan bahwa silika gel adalah amorf sedangkan hasil BET surface area analyzer menunjukkan bahwa silika gel termasuk dalam mesopori dengan volume total pori dan luas permukaan spesifik silika gel tertinggi diperoleh pada pH 9 dan dengan konsentrasi PEG 6000 0,03 g/100 mL yaitu masing-masing 124,574 cm3/g dan 285,456 m2/g.
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RAMOS, Vanessa Machado Babinski, Maurício Gammertt RÖHNELT, and Rodrigo BRAMBILLA. "HDPE/SILICA COMPOSITES-PART II: EFFECT OF SILICA PARTICLE SIZE AND SILICA MODIFICATION ON THE THERMAL AND MECHANICAL PROPERTIES." Periódico Tchê Química 16, no. 32 (August 20, 2019): 287–305. http://dx.doi.org/10.52571/ptq.v16.n32.2019.305_periodico32_pgs_287_305.pdf.

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In this work, the effect of silica particle size and organosilane type used in the silica organofunctionalization on the thermal and mechanical properties of high-density polyethylene (HDPE)/silica composites were evaluated. HDPE/silica composites were prepared by the extrusion method using two types of silica: fumed silica, with nanometric particle size and silica gel, micrometric, modified with organosilanes containing methyl or octyl functional groups. Silicas were added to the HDPE at 1% v/v concentration. The addition of the silicas to the HDPE did not influence the melt (Tm) and the crystallization (Tc) temperatures of the resulting composites but influenced its crystallinity. The mechanical property of Izod impact strength, the dynamicmechanical rheological test (DMTA) and the surface contact angle analysis showed improvements in relation to pure HDPE when used methyl-modified pyrogenic silica as filler. This result suggests that the surface modification of pyrogenic silica with methylsilane groups results in a stronger interaction of this silica with the HDPE matrix. This effect was not observed for micron-sized silica gel, where modification with organosilanes was not sufficient to guarantee interfacial interaction with the HDPE matrix.
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Hench, L. L., and W. Vasconcelos. "Gel-Silica Science." Annual Review of Materials Science 20, no. 1 (August 1990): 269–98. http://dx.doi.org/10.1146/annurev.ms.20.080190.001413.

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Unger, K. K. "Silica gel chemistry." TrAC Trends in Analytical Chemistry 13, no. 8 (September 1994): 339–40. http://dx.doi.org/10.1016/0165-9936(94)87008-x.

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RAMOS, Vanessa Machado Babinski, Maurício Gammertt RÖHNELT, and Rodrigo BRAMBILLA. "HDPE/SILICA COMPOSITES- PART I: PREPARATION AND CHARACTERIZATION OF METHYLSILANE AND OCTYLSILANE-MODIFIED SILICAS." Periódico Tchê Química 16, no. 32 (August 20, 2019): 263–78. http://dx.doi.org/10.52571/ptq.v16.n32.2019.281_periodico32_pgs_263_278.pdf.

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This paper reports the main results concerning the synthesis and characterization of methylsilane and octylsilane-modified silicas. The modification of the silicas with these groups aims to make the silica surface hydrophobic and thus compatible with high-density polyethylene (HDPE) in HDPE/silica composites. In the present work, two types of silica were organofunctionalized: a pyrogenic silica and a silica gel. The silicas were characterized by a series of complementary techniques with the objective of investigating the nature of the surface species and their textural and morphological characteristics. The SEM images showed that the modification of the silicas with organosilanes has been not resulted in changes on the morphology and on the size of silica particles. In relation to the texture properties, determined by N2 adsorption-desorption porosimetry, the silica modification resulted in a decrease of the specific area (SBET) and the mean pore volume, a behavior attributed to the partial coverage of the adsorption sites by the organosilane molecules. The TGA analysis showed that both the methylsilane groups and the octylsilane groups on the surface of silica and silica gel are thermally stable up to 200 ° C, which enables the organofunctionalized silicas in terms of thermal stability, for the process of preparing the composites by extrusion. The results of applying these organofunctionalized silicas in the development of HDPE/silica composites will be presented in a subsequent article, part II of this research.
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Wibowo, Emas Agus Prastyo, Adi Wahyu Arzanto, Khoironni Devi Maulana, and Aden Dhana Rizkita. "PREPARASI DAN KARAKTERISASI NANOSILIKA DARI JERAMI PADI." JURNAL ILMIAH SAINS 18, no. 1 (July 19, 2018): 35. http://dx.doi.org/10.35799/jis.18.1.2018.19089.

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PREPARASI DAN KARAKTERISASI NANOSILIKA DARI JERAMI PADIABSTRAKPenelitian ini dilakukan untuk mengetahui karakteristik silika yang diekstraksi dari jerami padi yang diperoleh dari wilayah usaha tani padi Pekalongan. Silika diperoleh dengan metode sol-gel, yang melibatkan ekstraksi silika dengan larutan alkali dan gelasi silika menggunakan larutan asam. Ditemukan bahwa hasil tertinggi diperoleh dari ekstraksi menggunakan larutan KOH 5% dengan waktu ekstraksi 60 menit, dan pH gelasi 7.0. Persiapan berhasil diproduksi dengan memanaskan jerami padi pada suhu 10 °C/menit dan menahannya pada suhu 500°C untuk memudahkan penguraian dan pengadopsian bahan organik sambil menghindari pengapian otomatis. Komposisi kimia SiO2 diperkuat oleh EDS dan FTIR dan sifat amorf oleh XRD.Serbuk nanosilika dengan ukuran pori rata – rata 45,3869 nm dan memiliki permukaan spesifik (94,761 m2/g).Kata kunci: Jerami padi; Nanopartikel silika, Sol gel PREPAPARATION AND CHARACTERIZATION NANOSILICAFROM RICE STAWABSTRACTThis study was carried out to investigate the characteristics of silica extracted from rice straw obtained from rice farming region of Pekalongan. The silica was obtained using sol-gel method, which involves extraction of silica using alkalis solution and gelation of the silica using acid solution. It was found that the highest yield was obtained from the extraction using 5% KOH solution with the extraction time of 60 minutes, and gelation pH of 7.0. Preparation was successfully produced by heating rice straw at 10 °C/min and holding at 500°C to facilitate decomposition and gasification of the organics while avoiding auto-ignition. The SiO2 chemical composition was confirmed by EDS and FTIR and the amorphous nature by XRD. Nanosilica powders with a 45,3869 nm average pore size and have specific surface (94,761 m2/g).Keywords: Rice straw; Silica nanoparticles, Sol gel
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Hastuti, Rum, and Gunawan Gunawan. "Amobilasasi Biomassa Chlorella Sp pada Silika Gel sebagai Adsorben Tembaga." Jurnal Kimia Sains dan Aplikasi 9, no. 2 (August 1, 2006): 40–44. http://dx.doi.org/10.14710/jksa.9.2.40-44.

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Amobilisasi Biomassa Chlorella sp pada Silika gel sebagai adsorben, merupakan salah satu upaya untuk meningkatan kapasitas adsorpsi adsorben . Silika gel dan Biomassa Chlorella sp keduanya merupakan adsorben yang mempunyai keterbatasan kemampuan adsorpsin. Dengan melakukan amobilsasi Biomassa Chlorella sp pada silica gel diharapkan kesinergian sebagai adsorben dapat meningkatkan kapasitas adsorpsi adsorben tersebut. Uji kapasitas adsorpsi diterapkan pada larutan tembaga (II) melalui beberapa parameter perlakuan, yaitu pH larutan, waktu kontak dan konsentrasi larutan tembaga (II). Dari hasil pengamatan diperoleh peningkatan kapasitas adsorpsi 5 kali lebih besar. Kapasitas adsorpsi maksimal adsorben biomassa chlorella sp teramobilisasi terjadi pada pH=5 dengan kapasitas adsorpsi 24,91 mg/g, sedangkan kapasitas adsorpsi maksimal biomassa chlorella sp tanpa amobilisasi pada silica gel hanya 23,58 mg/g. pada pH=4
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SUGIZAKI, Toshio, Toshifumi KAGEYAMA, and Osamu MORIYA. "Synthesis of Organofunctionalized Silica Gel from Organostannylated Silica Gel and Chlorosilane." Journal of the Ceramic Society of Japan 106, no. 1235 (1998): 727–30. http://dx.doi.org/10.2109/jcersj.106.727.

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Dissertations / Theses on the topic "Silica gel"

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Adetola, Opeyemi. "Immobilization of Heteropolyacids in Silica Gel." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/etd/3050.

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Silica gels containing incorporated heteropolyacids (HPAs) were synthesized in acidic media by co-condensation of tetraethoxysilane (TEOS) with phosphotungstic or phosphomolybdic acids using sol-gel technique. Effect of the synthesis conditions on their structure and morphology was studied. Yields of modified materials were some lower as compared to non-modified silica gels. All materials were mesoporous but contained micropores in their structures. Presence of bands of Keggin’s structures in FT-IR spectra along with absence of XRD patterns of crystalline HPAs confirmed their fine incorporation into silica network. Particle sizes of modified materials were 800-1100 nm excepting for W-containing sample obtained with trimethylstearylammonium chloride. This unusual effect was attributed to stabilization of primary silica nanoparticles by interaction between surfactant and HPA. High ratio HPA/TEOS resulted in partial loss of porosity. Obtained results might be used for optimization of synthesis of effective catalysts and adsorbents containing HPAs in mesoporous structure.
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Selwyn, Rebecca. "Improved adsorption calorimeter : studies of loose grained silica gel and silica gel-based selective water sorbent (SWS-1L)." Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.702188.

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This thesis aimed to develop a new version of an adsorption calorimeter originally proposed by Ahamat and Tierney. A more rigorous approach was taken in terms of mechanical components, vacuum equipment, calibration of thermoelectric modules, and length of tests. Novel contributions include the new temperature control algorithm, new adsorbent configuration, new adsorbent, and consideration of the effect of residual air on the kinetics of adsorption. Improved design of the hardware reduced the air ingress from 1mbar/hour to
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Kapusuz, Derya. "Sol-gel Synthesis Of Dna Encapsulated Silica." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/2/12610627/index.pdf.

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Sol-gel processing routes for encapsulation of double stranded DNA in solid porous silica hosts have been established. The encapsulation was carried out in two steps: hydrolysis of a silica-forming alkoxide-based sol was followed by condensation/gelation to a solid form upon addition of a buffer solution containing DNA molecules. The effects of gelation chemistry and DNA amount on chemical and microstructural properties of resultant silica matrices and on DNA encapsulation efficiency were investigated. The analytical characterization was performed by UV-vis spectroscopy, 29Si nuclear magnetic resonance spectroscopy and by nitrogen adsorption studies. It was demonstrated that DNA incorporation had a pH-dependent catalytic effect on gelation kinetics and promoted silica network completion. In addition, the scale of porosity and the average pore size of the resultant silica increased with gelation pH and also with DNA-buffer solution in the starting sol-gel formulation. The chemistry-derived pore size variation controls the DNA encapsulation efficiency in the silica matrices and the DNA holding capacity strongly depends on the scale of the porosity attained. The selective adsorption of ethidium bromide- a DNA-intercalative reagent molecule- on DNA-silica gels confirmed that the DNA molecules remained entrapped within the silica host in their native state without any deterioration. Besides pure silica, amine-functionalized hybrid silica hosts were also formed by sol-gel. The hybrid gels were found not to be suitable for DNA encapsulation, as these matrices dissolve in aqueous environment due to incomplete silica network formation. The DNA-doped silica hosts may provide promising matrices for development of biosensors, bioreactors and bioassay platforms.
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Tan, Bing. "Controlled synthesis and functionalization of nanoporous sol-gel silica particles and gels." Lexington, Ky. : [University of Kentucky Libraries], 2005. http://lib.uky.edu/ETD/ukychen2005d00329/etd.pdf.

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Thesis (Ph. D.)--University of Kentucky, 2005.
Title from document title page (viewed on November 2, 2005). Document formatted into pages; contains xix, 336 p. : ill. Includes abstract and vita. Includes bibliographical references (p. 331-334).
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Spencer, Laura Marie. "Evaluation of sand treated with colloidal silica gel." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37131.

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Liquefiable soils are common at ports due to the use of hydraulic fills for construction of waterfront facilities. Liquefaction-induced ground failure can result in permanent ground deformations that can cause loss of foundation support and structural damage. This can lead to substantial repair and/or replacement costs and business interruption losses that can have an adverse effect on the port and the surrounding community. Although numerous soil improvement methods exist for remediating a liquefaction-prone site, many of these methods are poorly suited for developed sites because they could damage existing infrastructure and disrupt port operations. An alternative is to use a passive remediation technique. Treating liquefiable soils with colloidal silica gel via permeation grouting has been shown to resist cyclic deformations and is a candidate to be used as a soil stabilizer in passive mitigation. The small-strain dynamic properties are essential to determine the response to seismic loading. The small-to-intermediate strain shear modulus and damping ratio of loose sand treated with colloidal silica gel was investigated and the influence of colloidal silica concentration was determined. The effect of introducing colloidal silica gel into the pore space in the initial phase of treatment results in a 10% to 12% increase in the small-strain shear modulus, depending on colloidal silica concentration. The modulus reduction curve indicates that treatment does not affect the linear threshold shear strain, however the treated samples reduce at a greater rate than the untreated samples in the intermediate-strain range above 0.01% cyclic shear strain. It was observed that the treated sand has slightly higher damping ratio in the small-strain range; however, at cyclic shear strains around 0.003% the trend reverses and the untreated sand begins to have higher damping ratio. Due to the nature of the colloidal silica gelation process, chemical bonds continue to form with time, thus the effect of aging on the dynamic properties is important. A parametric study was performed to investigate the influence of gel time on the increase in small-strain shear modulus. The effect of aging increases the small-strain shear modulus after gelling by 200 to 300% for the 40-minute-gel time samples with a distance from gelation (time after gelation normalized by gel time) of 1000 to 2000; 700% for the 2-hour-gel time sample with a distance from gelation of 1000; and 200 to 400% for the 20-hour-gel time samples with a distance from gelation of 40 to 100. The treatment of all potentially liquefiable soil at port facilities with colloidal silica would be cost prohibitive. Identifying treatment zones that would reduce the lateral pressure and resulting pile bending moments and displacements caused by liquefaction-induced lateral spreading to prevent foundation damage is an economic alternative. Colloidal silica gel treatment zones of varying size and location were evaluated by subjecting a 3-by-3 pile group in gently sloping liquefiable ground to 1-g shaking table tests. The results are compared to an untreated sample. The use of a colloidal silica treatment zone upslope of the pile group results in reduced maximum bending moments and pile displacements in the downslope row of piles when compared to an untreated sample; the presence of the treatment zone had minimal effect on the other rows of piles within the group.
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Williams, Sian Lowri. "Photochemistry and photophysics of anthracenes on silica gel." Thesis, Loughborough University, 1996. https://dspace.lboro.ac.uk/2134/19426.

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Studies have been carried out investigating the photochemical and photophysical properties of anthracene adsorbed on silica gel. The photochemistry and photo physics of anthracene in solution are well reported and known, hence its choice as a probe for the silica gel surface. UV -visible absorption and fluorescence spectra of anthracene adsorbed on silica gel reveal aggregate formation at very low loadings (1 % of a monolayer) indicating preferential adsorption occurs at some surface sites. Laser flash photolysis at 355 nm produces both the triplet and radical cation of anthracene, their production was found to be mono- and multi-photonic respectively. The decays of both these transients were complex and the rates increased with increasing loading. Analysis of the triplet state decay has been carried out by studying the delayed fluorescence which arises from triplet triplet annihilation. Fractal and twodimensional models have been used to describe this bimolecular decay. The coadsorption of anthracene and an electron donor having an oxidation potential below 1.09 V on silica gel causes electron transfer to occur from the electron donor to the anthracene radical cation produced following laser flash photolysis at 355 nm. Studies using a selection of electron donors with varying reduction potentials were carried out. The electron donor transfers an electron to the anthracene radical cation, thus greatly accelerating its rate of decay; for electron donors such as triphenylamine, N,N-dimethylaniline and N,N,N',N'tetramethyl- l,4-phenylenediamine the rise of the donor radical cation is observed as the anthracene cation decays. These systems were studied using fluorescence measurements and laser flash photolysis to study any fluorescence quenching and the rate of decay of both the anthracene triplet and radical cation. A selection of anthracene derivatives adsorbed onto silica gel were also briefly studied to see the effect of substituent group and its position. Symmetrically substituted dialkoxyanthracenes and 9-cyanoanthracene were used. The transient absorption spectra of the 2,3- and 2,6-dialkoxyderivatives and 9-cyanoanthracene revealed spectral similarities with that of unsubstituted anthracene. The spectra of9,10- and I,S-didecyloxyanthracene showed significant differences in the radical cation spectra to those obtained for unsubstituted anthracene.
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Adeogun, Michael J. "Silica sol-gel hybrids based on ionene polymers." Thesis, University of Surrey, 1998. http://epubs.surrey.ac.uk/843746/.

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By use of the Menshutkin reaction a variety of polyviologens has been synthesised containing bromide, tosylate or mesylate counter-ions and varying methylene units. Owing to the ionic character of these main-chain polymers, these polyviologens are also known as ionene polymers. Additionally, this ionic character conveys a wide range of properties including the ability to undergo redox reactions and display liquid crystalline behaviour. The redox behaviour of these polymers can be followed easily by a colour change in the polyviologen. It was this reasoning, and the susceptibility of polyviologens to atmospheric water, that first led to the introduction of these polymers into a silica sol-gel network to produce 'durable' sol-gel redox sensors. The sol-gel process was found to be a convenient and versatile route to produce inorganic networks using the acid-catalysed hydrolysis and condensation of silicon alkoxide precursors. Synthetic methods were developed to optimise the incorporation of various polyviologens into a silica network. A variety of analytical techniques was employed to characterise the polyviologens and the corresponding sol-gel hybrids. Results from SAXS, IR and surface analysis provide strong evidence that the polyviologens have an effect on the structure of the inorganic component. Rare surface fractal behaviour was observed and the pore geometry was found to go from smooth and cylindrical to ink-bottle in shape for some of the hybrid systems. An hypothesis is forwarded suggesting that the presence and concentration of polyviologen, electrostatic interactions between N+ and silanol groups, and hydrophobic hydration may all play an important role in determining the structure of the silica network.
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Steinthal, Michael Gregory 1964. "Laser densification of sol-gel-derived silica coatings." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277183.

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Sol-gel derived silica coatings were deposited on soda-lime-silica by dip-coating. An absorbing metallic layer was sputtered onto the surface of the gel to couple near-infrared radiation from a Nd:YAG laser into the transparent coating. Laser energy was utilized to heat the ceramic coating on a substrate which has a lower glass transition temperature than the coating. Scanning the sample across the beam's path resulted in the formation of a 50 mum wide channel. The characteristics of a channel were altered by varying laser power, sol-gel coating thickness, and scanning speeds. Profilometry and SEM analysis verified that the coating can be heated to high temperatures without damaging the substrate.
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Silva, Junior José da. "Obtenção de xerogel de sílica a partir das cascas de arroz em uma aproximação bottom-up para produção de materiais em eletrônica." Florianópolis, SC, 2009. http://repositorio.ufsc.br/xmlui/handle/123456789/93406.

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Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2009.
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O presente trabalho tem por objetivo desenvolver uma rota de obtenção de dióxido de silício a partir das cascas de arroz, realizando um pré-tratamento com água régia, solução piranha e pirólise em mufla a 600°C por 4 horas. Com estes procedimentos buscou-se um grau de pureza acima dos 99%, adequado ao uso do material na síntese de uma matriz microporosa que servirá ao desenvolvimento de dispositivos eletrônicos futuramente. Realizou-se, em cada etapa de separação da sílica, análise termogravimétrica, calorimetria diferencial de varredura, espectroscopia de infravermelho com transformada de Fourier, fluorescência e difração de raios X, com o objetivo de conhecer as etapas de separação da matéria orgânica e as mudanças de composição e estrutura ocorridas no pré-tratamento e na pirólise final em mufla. Com o dióxido de silício obtido a partir das cascas de arroz foram sintetizados géis dentro do processo Sol-Gel, com a solubilização alcalina, a precipitação ácida, a moldagem, a gelificação, o crescimento do gel e a secagem para obter o xerogel. Foi verificado que os xerogéis produzidos, ao secarem, apresentaram fraturas causadas por pressões capilares geradas na microporosidade que impossibilitou a preservação do volume inicial, elemento fundamental no projeto de dispositivos eletrônicos. É apresentada uma via para evitar a degradação do volume das amostras, através da secagem supercrítica, utilizando dióxido de carbono na substituição da fase líquida. Isto atenuaria as pressões capilares no ato de remoção dos solventes dispersos, eliminando as correntes de fuga e permitindo a construção dos dispositivos.
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Forero, Duenas Carlos Antonio. "Characterisation of a silica-gel as a geotechnical cement." Thesis, Imperial College London, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.301001.

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Books on the topic "Silica gel"

1

Silica: The amazing gel, an essential mineral for radiant health recovery and rejuvenation. Burnaby, B.C: Alive Books, 1993.

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Scott, Raymond P. W. Silica gel and bonded phases: Their production, properties, and use in LC. Chichester: Wiley, 1993.

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V, Lisichkin G., ed. Modifit͡s︡irovannye kremnezemy v sorbt͡s︡ii, katalize i khromatografii. Moskva: "Khimii͡a︡", 1986.

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Bansal, Narottam P. Influence of several metal ions on the gelation activation energy of silicon tetraethoxide. [Washington, DC]: National Aeronautics and Space Administration, 1989.

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Menaa, Bouzid. Bioencapsulation in silica-based nanoporous sol-gel glasses. New York: Nova Science Publishers, 2010.

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Hench, L. L. Sol-gel silica: Properties, processing, and technology transfer. Westwood, N.J., U.S.A: Noyes Publications, 1998.

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Bouzid, Menaa, ed. Bioencapsulation in silica-based nanoporous sol-gel glasses. Hauppauge, N.Y: Nova Science Publishers, 2009.

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Royal Society of Chemistry (Great Britain), ed. Silica-based materials for advanced chemical applications. Cambridge: RSC Pub., 2009.

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V, Mchedlishvili B., and Saminskiĭ E. M, eds. Khromatografii͡a︡ biopolimerov na makroporistykh kremnezemakh. Leningrad: Izd-vo "Nauka," Leningradskoe otd-nie, 1986.

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Ellis, David J. A study in composition and reaction conditions related to alkali-silica gel expansion. [London]: Queen Mary College, 1987.

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Book chapters on the topic "Silica gel"

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Gooch, Jan W. "Silica Gel." In Encyclopedic Dictionary of Polymers, 664. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_10638.

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Ruthruff, Robert F., H. S. Booth, and Albert Dolance. "Silica Gel." In Inorganic Syntheses, 95–98. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132333.ch26.

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Zhu, Yimei, Hiromi Inada, Achim Hartschuh, Li Shi, Ada Della Pia, Giovanni Costantini, Amadeo L. Vázquez de Parga, et al. "Silica Gel Processing." In Encyclopedia of Nanotechnology, 2420. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-90-481-9751-4_100758.

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Ruthruff, Robert F., H. S. Booth, and Albert Dolance. "Silica Gel (Correction)." In Inorganic Syntheses, 55. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470132364.ch15.

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Chaudhuri, S. Ray, and Arnab Sarkar. "Large Silica Monoliths." In Sol-Gel Optics, 83–107. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2750-3_4.

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Hesemann, Peter, Lydie Viau, and André Vioux. "Silica Ionogels and Ionosilicas." In The Sol-Gel Handbook, 487–518. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527670819.ch16.

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López, Antonio Julio, and Joaquín Rams. "Reinforced Sol-Gel Silica Coatings." In The Sol-Gel Handbook, 1207–38. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2015. http://dx.doi.org/10.1002/9783527670819.ch39.

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Schwertfeger, Fritz, Andreas Emmerling, Joachim Gross, Ulrich Schubert, and J. Fricke. "Organically Modified Silica Aerogels." In Sol-Gel Processing and Applications, 343–49. Boston, MA: Springer US, 1994. http://dx.doi.org/10.1007/978-1-4615-2570-7_29.

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Ismail, A. F., M. H. D. Othman, and M. A. Rahman. "Silica Gel for Membrane Preparation." In Encyclopedia of Membranes, 1–2. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-40872-4_760-2.

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Ismail, Ahmad Fauzi, M. H. D. Othman, and Mukhlis bin A. Rahman. "Silica Gel for Membrane Preparation." In Encyclopedia of Membranes, 1773–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-44324-8_760.

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Conference papers on the topic "Silica gel"

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Hench, L. L., S. H. Wang, and J. L. Nogues. "Gel-Silica Optics." In 1988 Los Angeles Symposium--O-E/LASE '88, edited by Robert L. Gunshor. SPIE, 1988. http://dx.doi.org/10.1117/12.943959.

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Ramaswamy, R. V., Taipau Chia, R. Srivastava, A. Miliou, and J. West. "Gel Silica Waveguides." In 1988 Los Angeles Symposium--O-E/LASE '88, edited by Robert L. Gunshor. SPIE, 1988. http://dx.doi.org/10.1117/12.943960.

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Hench, Larry L., Jon K. West, Bing F. Zhu, and R. Ochoa. "Gel-silica hybrid optics." In San Dieg - DL Tentative, edited by John D. Mackenzie and Donald R. Ulrich. SPIE, 1990. http://dx.doi.org/10.1117/12.22562.

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McDonagh, Colette M., P. Marron, P. Kiernan, and John F. McGilp. "Optical probes in sol-gel silica." In San Diego '92, edited by John D. Mackenzie. SPIE, 1992. http://dx.doi.org/10.1117/12.131999.

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Wojcik, Anna B., and Lisa C. Klein. "Transparent poly(vinyl acetate)-silica gels by a sol-gel process." In SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, edited by Gary W. Wilkerson. SPIE, 1993. http://dx.doi.org/10.1117/12.165225.

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Chen, C., S. Huang, C. Wu, Y. Kuo, and W. Lin. "249. Aerosol Penetration Through Silica Gel Tube." In AIHce 2000. AIHA, 2000. http://dx.doi.org/10.3320/1.2763586.

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Preda, Alexandru M., Eugen N. Scarlat, Liliana Preda, and Ion M. Popescu. "Optical devices with silica-gel small spheres." In ROMOPTO '97: Fifth Conference on Optics, edited by Valentin I. Vlad and Dan C. Dumitras. SPIE, 1998. http://dx.doi.org/10.1117/12.312753.

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Gardener, Martin, and Carole C. Perry. "Novel thermochromism in silica sol-gel materials." In Symposium on Integrated Optoelectronics, edited by Bruce S. Dunn, Edward J. A. Pope, Helmut K. Schmidt, and Masayuki Yamane. SPIE, 2000. http://dx.doi.org/10.1117/12.384344.

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Enami, Yasufumi, and Shin-Ichiro Suye. "Sol-Gel Silica Waveguide for Biophotonic Sensors." In Asia-Pacific Optical Sensors Conference. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/apos.2016.w4a.5.

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Moreira, Paulo J., Paulo V. S. Marques, and Antonio P. Leite. "Hybrid silica sol-gel symmetric buried channel waveguide on silicon." In Photonics Europe, edited by Giancarlo C. Righini and Seppo Honkanen. SPIE, 2004. http://dx.doi.org/10.1117/12.545845.

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Reports on the topic "Silica gel"

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Ramamurthi, S. Molecular growth pathways in silica sol-gel polymerization. Office of Scientific and Technical Information (OSTI), January 1989. http://dx.doi.org/10.2172/6236739.

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Pesaran, A. A., and A. F. Mills. Moisture Transport in Silica Gel Particle Beds: I. Theoretical Study. Office of Scientific and Technical Information (OSTI), August 1986. http://dx.doi.org/10.2172/914653.

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Pesaran, A. A., and A. F. Mills. Moisture Transport in Silica Gel Packed Beds: II. Experimental Study. Office of Scientific and Technical Information (OSTI), August 1986. http://dx.doi.org/10.2172/914654.

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Miller, P., C. Thorsness, J. Ertel, D. Behne, and K. Kishiyama. Use of Silica Gel as a Getter for the Protection of Sol-gel Coated Optics: Concept Verification. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1165808.

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Kirkham, Robert John, and Alan Keith Herbst. Suitability of Silica Gel to Process INEEL Sodium Bearing Waste - Letter Report. Office of Scientific and Technical Information (OSTI), September 2000. http://dx.doi.org/10.2172/910751.

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Young, Sandra K. Silica-Based Sol-Gel Organic-Inorganic Nanocomposite Materials: A Review of Different Material Technologies. Fort Belvoir, VA: Defense Technical Information Center, May 2002. http://dx.doi.org/10.21236/ada401243.

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Camaioni, D., N. Colton, and R. Bruening. Investigation of the potential of silica-bonded macrocyclic ligands for separation of metal ions from nuclear waste. [Macrocyclic ligands covalently bonded to silica gel]. Office of Scientific and Technical Information (OSTI), January 1992. http://dx.doi.org/10.2172/5860074.

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Maxey, L. C., J. L. Nogues, and B. Moreshead. Diamond turned master molds for bulk casting of sol-gel silica diffractive optical elements. Final report. Office of Scientific and Technical Information (OSTI), August 1997. http://dx.doi.org/10.2172/505756.

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Guthrie, E. B., N. C. Shen, and B. B. Bandong. Isotope Exchange and Fractionation Corrections for Extraction of Tritiated Water in Silica Gel by Freeze-Drying Techniques. Office of Scientific and Technical Information (OSTI), September 2001. http://dx.doi.org/10.2172/15013462.

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Patton, G. W., A. T. Cooper, and M. R. Tinker. Evaluation of an ambient air sampling system for tritium (as tritiated water vapor) using silica gel adsorbent columns. Office of Scientific and Technical Information (OSTI), August 1995. http://dx.doi.org/10.2172/95223.

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