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Silviana S, Prastiti EC, Hermawan F, Setyawan A. Optimization of the Sound Absorption Coefficient (SAC) from Cellulose-Silica Aerogel Using the Box-Behnken Design. ACS OMEGA 2022; 7:41968-41980. [PMID: 36440151 PMCID: PMC9685788 DOI: 10.1021/acsomega.2c03734] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Accepted: 10/26/2022] [Indexed: 06/16/2023]
Abstract
Noise pollution, which has become a major environmental issue in urban areas, can be minimized using acoustic insulation derived from cellulose-silica aerogel. The raw materials required in the process include waste newspaper-based cellulose, geothermal silica, and NaOH/ZnO solution. Therefore, this study investigates the effect of cellulose, silica, and ZnO concentrations on optimizing the sound absorption coefficient (SAC) using the Box-Behnken design (BBD). The results showed that the optimum conditions were obtained at 39.8578 wt % cellulose, 16.5428 wt % silica, and 0.5684 wt % ZnO. The impedance test for the cellulose aerogel and cellulose-silica aerogel showed SAC values of 0.59 and 0.70, respectively, and were characterized by XRD, FTIR, BET-BJH, SEM-EDX, and TG. The results of XRD and FTIR data indicate that the product was cellulose-silica aerogel, and the SEM micrographs showed that silica particles were attached to the fiber surface. Furthermore, type IV isotherms were observed in the cellulose-silica aerogel, typical of mesoporous materials. The presence of silica strengthened the aerogel structure, improved its thermal stability, and increased the surface area but decreased its pore size.
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Affiliation(s)
- S. Silviana
- Department
of Chemical Engineering, Faculty of Engineering,
Diponegoro University, Tembalang, Semarang50275, Indonesia
| | - Enggar C. Prastiti
- Department
of Chemical Engineering, Faculty of Engineering,
Diponegoro University, Tembalang, Semarang50275, Indonesia
| | - Ferry Hermawan
- Department
of Civil Engineering, Faculty of Engineering,
Diponegoro University, Tembalang, Semarang50275, Indonesia
| | - Agus Setyawan
- Department
of Physics, Faculty of Science and Mathematics,
Diponegoro University, Tembalang, Semarang50275, Indonesia
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Lee KJ, Kim YH, Lee JK, Hwang HJ. Fast Synthesis of Spherical Silica Aerogel Powders by Emulsion Polymerization from Water Glass. ChemistrySelect 2018. [DOI: 10.1002/slct.201703000] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Kyoung-Jin Lee
- Dep. Mater. Sci. & Eng; Inha University; 253 Yonghyun-dong Nam-gu Incheon Korea
| | - Young H. Kim
- Basic Materials & Chemicals R&D; LG Chem; 188 Munji-ro, Yuseong-gu Daejeon Korea
| | - Je K. Lee
- Basic Materials & Chemicals R&D; LG Chem; 188 Munji-ro, Yuseong-gu Daejeon Korea
| | - Hae-Jin Hwang
- Dep. Mater. Sci. & Eng; Inha University; 253 Yonghyun-dong Nam-gu Incheon Korea
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Tay T, Köse E, Keçili R, Say R. Design and Preparation of Nano-Lignin Peroxidase (NanoLiP) by Protein Block Copolymerization Approach. Polymers (Basel) 2016; 8:polym8060223. [PMID: 30979315 PMCID: PMC6432496 DOI: 10.3390/polym8060223] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Revised: 05/09/2016] [Accepted: 06/01/2016] [Indexed: 12/13/2022] Open
Abstract
This study describes the preparation of nanoprotein particles having lignin peroxidase (LiP) using a photosensitive microemulsion polymerization technique. The protein-based nano block polymer was synthesized by cross-linking of ligninase enzyme with ruthenium-based aminoacid monomers. This type polymerization process brought stability in different reaction conditions, reusability and functionality to the protein-based nano block polymer system when compared the traditional methods. After characterization of the prepared LiP copolymer nanoparticles, enzymatic activity studies of the nanoenzymes were carried out using tetramethylbenzidine (TMB) as the substrate. The parameters such as pH, temperature and initial enzyme concentration that affect the activity, were investigated by using prepared nanoLip particles and compared to free LiP. The reusability of the nano-LiP particles was also investigated and the obtained results showed that the nano-LiP particles exhibited admirable potential as a reusable catalyst.
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Affiliation(s)
- Turgay Tay
- Department of Chemistry, Anadolu University, 26470 Eskisehir, Turkey.
| | - Ender Köse
- Karen Biotechnol Ltd., Anadolu University, Technol Pk, 26470 Eskisehir, Turkey.
| | - Rüstem Keçili
- Yunus Emre Vocational School, Department of Medical Services and Techniques, Anadolu University, 26470 Eskisehir, Turkey.
| | - Rıdvan Say
- Department of Chemistry, Anadolu University, 26470 Eskisehir, Turkey.
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Characterization of biocatalysts prepared with Thermomyces lanuginosus lipase and different silica precursors, dried using aerogel and xerogel techniques. Appl Biochem Biotechnol 2013; 172:263-74. [PMID: 24078188 DOI: 10.1007/s12010-013-0533-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2013] [Accepted: 09/15/2013] [Indexed: 10/26/2022]
Abstract
The use of lipases in industrial processes can result in products with high levels of purity and at the same time reduce pollutant generation and improve both selectivity and yields. In this work, lipase from Thermomyces lanuginosus was immobilized using two different techniques. The first involves the hydrolysis/polycondensation of a silica precursor (tetramethoxysilane (TMOS)) at neutral pH and ambient temperature, and the second one uses tetraethoxysilane (TEOS) as the silica precursor, involving the hydrolysis and polycondensation of the alkoxide in appropriate solvents. After immobilization, the enzymatic preparations were dried using the aerogel and xerogel techniques and then characterized in terms of their hydrolytic activities using a titrimetric method with olive oil and by the formation of 2-phenylethyl acetate in a transesterification reaction. The morphological properties of the materials were characterized using scanning electron microscopy, measurements of the surface area and pore size and volume, thermogravimetric analysis, and exploratory differential calorimetry. The results of the work indicate that the use of different silica precursors (TEOS or TMOS) and different drying techniques (aerogel or xerogel) can significantly affect the properties of the resulting biocatalyst. Drying with supercritical CO2 provided higher enzymatic activities and pore sizes and was therefore preferable to drying, using the xerogel technique. Thermogravimetric analysis and differential scanning calorimetry analyses revealed differences in behavior between the two biocatalyst preparations due to the compounds present.
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Say R, Keçili R, Biçen Ö, Şişman FY, Hür D, Denizli A, Ersöz A. A novel nanoprotein particle synthesis: Nanolipase. Process Biochem 2011. [DOI: 10.1016/j.procbio.2011.04.011] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Yang J, Liu L, Cao X. Combination of bioimprinting and silane precursor alkyls improved the activity of sol–gel-encapsulated lipase. Enzyme Microb Technol 2010. [DOI: 10.1016/j.enzmictec.2009.11.004] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Gao Y, Heinemann A, Knott R, Bartlett J. Encapsulation of protein in silica matrices: structural evolution on the molecular and nanoscales. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2010; 26:1239-1246. [PMID: 19722605 DOI: 10.1021/la9023986] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The immobilization of biological species such as proteins and enzymes in sol-gel hosts is currently an area of intense research activity. However, the majority of these studies have been directed toward investigating the biological activity or physicochemical properties of the encapsulated species, with much less attention having been directed toward the effect of proteins on the structural evolution of the sol-gel matrix. This study investigates the structural evolution of sol-gel matrices in the presence of a model protein, bovine serum albumin (BSA). The sol-gel matrices were produced via the NaF-catalyzed hydrolysis of a mixture of tetramethyoxysilane (TMOS) and methyltrimethoxysilane (MTMS), yielding nanohybrid matrices with controlled pore sizes, pore volumes, and surface chemistry. The structural evolution of the matrix was investigated using a complementary suite of techniques, including solid-state (29)Si NMR, FTIR, SANS contrast variation, and N(2) sorption. A novel approach was developed to model the SANS data, to extract key structural parameters. The results indicated that the structural evolution of the matrices was modulated by a series of complex interactions between the enzyme and the evolving sol-gel nanohybrid: On the molecular scale, increasing BSA content led to an associated increase in both the abundance of linear Si-O-Si species (FTIR) and the Qn network connectivity ((29)Si NMR). However, only minor changes in the connectivity of the evolving Tn network were evident with varying BSA content. The selective role of the protein in these systems, where the approach of the methylated monomer to the vicinity of the protein's surface is presumably impeded by the hydrophobicity of the monomer, will be discussed. On the nanoscale, N(2) sorption data were consistent with an initial increase in the mesopore volume and surface area at low BSA loadings, followed by a subsequent monotonic decrease with increasing BSA content. In contrast, no such trends were evident in the in situ SANS data obtained from these samples, suggesting that modulation of the evolving network structure of the silica matrix by BSA during condensation prevents collapse of the nanoscale gel structure during freeze-drying. This latter comparison reflects the important role of in situ techniques such as small angle scattering (which can be used to study both open and closed porosity and probe nanostructure on length scales from approximately 1 nm to >100 nm) in investigating such complex, multicomponent systems, and techniques for modeling such data in sol-gel systems will be discussed.
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Affiliation(s)
- Yan Gao
- ANSTO, Private Mail Bag, Menai NSW 2234, Australia.
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Soares CM, dos Santos OA, de Castro HF, de Moraes FF, Zanin GM. Characterization of sol–gel encapsulated lipase using tetraethoxysilane as precursor. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcatb.2006.01.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Avnir D, Coradin T, Lev O, Livage J. Recent bio-applications of sol–gel materials. ACTA ACUST UNITED AC 2006. [DOI: 10.1039/b512706h] [Citation(s) in RCA: 629] [Impact Index Per Article: 34.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Compared esterification kinetics of the lipase from Burkholderia cepacia either free or encapsulated in a silica aerogel. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/j.molcatb.2004.12.006] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Wheeler KE, Lees NS, Gurbiel RJ, Hatch SL, Nocek JM, Hoffman BM. Electrostatic Influence on Rotational Mobilities of Sol−Gel-Encapsulated Solutes by NMR and EPR Spectroscopies. J Am Chem Soc 2004; 126:13459-63. [PMID: 15479102 DOI: 10.1021/ja046659c] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The rotational mobilities of small solute molecules encapsulated in tetramethyl orthosilicate (TMOS) sol-gels have been investigated by EPR spectroscopy of encapsulated nitroxide probes and by high-resolution NMR spectroscopic measurements of transferred NOE's (trNOE's), of T(1)'s, and of T(1)'s in the rotating frame (T(1)rho). The two spectroscopic methods are sensitive to motions on different time scales and hence, are nicely complementary. Suites of neutral, positively, and negatively charged nitroxide probes (EPR) and of simple diamagnetic small molecules (NMR) were selected to disclose influences of electrostatic interactions with the sol-gel walls and to probe the presence of multiple populations of molecules in distinct regions of the sol-gel pores. For neutral and negatively charged solute probes, both techniques disclose a single population with a significantly increased average rotational correlation time, which we interpret at least in part as resulting from exchange between free-volume and transiently immobilized surface populations. The electrostatic attraction between cationic probes and the negatively charged sol-gel walls causes the positively charged probes to be more effectively immobilized and/or causes a greater percentage of probes to undergo this transient immobilization. The EPR spectra directly disclose a population of cationic probes which are immobilized on the X-band EPR time scale: tau(c) greater than or approximately equal 10(-7) s. However, NMR measurements of trNOE's and of T(1)rho demonstrate that this population does exchange with the free-volume probes on the slower time scale of NMR. This approach is equally applicable to the study of solutes within other types of confined spaces, as well.
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Affiliation(s)
- Korin E Wheeler
- Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, Illinois 60208-3113, USA
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