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"Santa Barbara Amorphous-15 (SBA-15) is an interesting mesoporous silica material with highly ordered nanopores and a large surface area. Due to its unique properties, this material has been widely employed in many areas. This study aimed to predict the number of nanopores per gram of SBA-15 material based on an optimum value of surfactant addition at the desired number of nanopores. For this purpose, SBA-15 was synthesized via a sol-gel process using tetraethyl orthosilicate (TEOS, Si(OC2H5)4) as a precursor and pluronic P123 triblock copolymer surfactant (EO20PO70EO20, EO = ethylene oxide, PO = propylene oxide) as a template. There were five different surfactant concentrations, namely 0.35, 2.50, 2.70, 3.00, and 3.30 millimoles, used with a fixed concentration of TEOS. The characterization was performed using small-angle x-ray scattering (SAXS), adsorption-desorption (BET), and transmission electron microscopy (TEM). The results showed that the surfactant concentration did not affect the crystal structure, although an increase in the surfactant concentration linearly correlated with an increase in the surface area. The shape and size of the pore diameter tends to be approximately 3 nm, as characterized using BET adsorption-desorption. The optimum concentration of surfactant for the formation of mesoporous SBA-15 material was 2.70 millimoles. The value obtained in this study was in accordance with the calculated value, indicating that the theoretical calculations can be used to experimentally predict the number of pores."

"Santa BarbaraAmorphous-15 (SBA-15) is aninteresting mesoporous silica material with highly ordered nanopores and alarge surface area. Due to its unique properties, this material has been widelyemployed in many areas. This study aimed to predict the number of nanopores pergram of SBA-15 material based on an optimum value of surfactant addition at thedesired number of nanopores. For this purpose, SBA-15 was synthesized via asol-gel process using tetraethyl orthosilicate (TEOS, Si(OC2H5)4)as a precursor and pluronic P123 triblock copolymer surfactant (EO20PO70EO20,EO = ethylene oxide, PO = propylene oxide) as a template. There were fivedifferent surfactant concentrations, namely 0.35, 2.50, 2.70, 3.00, and 3.30millimoles, used with a fixed concentration of TEOS. The characterization wasperformed using small-angle x-ray scattering (SAXS), adsorption-desorption(BET), and transmission electron microscopy (TEM). The results showed that thesurfactant concentration did not affect the crystal structure, although anincrease in the surfactant concentration linearly correlated with an increasein the surface area. The shape and size of the pore diameter tends to beapproximately 3 nm, as characterized using BET adsorption-desorption. Theoptimum concentration of surfactant for the formation of mesoporous SBA-15material was 2.70 millimoles. The value obtained in this study was inaccordance with the calculated value, indicating that the theoreticalcalculations can be used to experimentally predict the number of pores."

"Skripsi ini membahas mengenai pengaruh aplikasi pasta CPP-ACP terhadap kekasaran permukaan semen ionomer kaca (SIK) pit dan fissure sealant (PFS) setelah perendaman dalam Coca Cola® dengan melakukan perendaman spesimen SIK PFS dalam akuabides (kontrol), perendaman Coca Cola®, pengaplikasian pasta CPP-ACP yang dilanjutkan dengan perendaman dalam Coca Cola® serta pengaplikasian pasta CPP-ACP yang didiamkan selama 30 menit lalu dilanjutkan dengan perendaman dalam Coca Cola®. Hasil penelitian menunjukkan peningkatan kekasaran permukaan yang signifikan pada spesimen yang direndam dalam Coca Cola®, penurunan kekasaran permukaan yang tidak signifikan pada spesimen yang diaplikasikan pasta CPP-ACP lalu direndam dalam Coca Cola®, serta penurunan kekasaran permukaan yang signifikan pada spesimen yang diaplikasikan pasta CPP-ACP dan didiamkan selama 30 menit kemudian direndam dalam Coca Cola®. Pengaplikasian pasta CPP-ACP yang didiamkan selama 30 menit menunjukkan perbedaan penurunan kekasaran permukaan yang signifikan dengan yang langsung direndam dalam Coca Cola®.

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This thesis aims to analyze the effect CPP-ACP paste to surface roughness of pit and fissure sealant (PFS) Glass Ionomer Cement (GIC) after placed in Coca Cola® drink. Speciments placed in aquabidest, placed in Coca Cola®, application of CPP-ACP paste then immediately placed in Coca Cola®, and application of CPP-ACP, waited for 30 minutes then placed in Coca Cola®. Surface roughness increased significantly after placed in Coca Cola®. No significant differences were found after application of CPP-ACP placed in Coca Cola® immediately. Surface roughness decreased significantly after application of CPP-ACP waited for 30 minutes then placed in Coca Cola®. The application of CPP-ACP pasteafter waited for 30 minutes then placed in Coca Cola® shows significant differences of PFS GIC’s surface roughness with speciments applicated by CPP-ACP paste and immediately placed in Coca Cola®."

"[ ABSTRAK Kaca merupakan sumber silika amorphous yang baik serta memiliki komposisi kimia dan reaktivitas yang tepat untuk melakukan reaksi Pozzolan. Sehingga muncul lah ide untuk menggunakan kaca sebagai agregat kasar pada beton. Pada penelitian ini, sampel yang dibuat adalah dua jenis beton, yaitu Portland dan Geopolimer dengan variasi substitusi kaca sebanyak 0%, 25%, 50%, 100%. Pengujian yang dilakukan adalah uji tekan dan pengamatan foto makro. Komposisi beton, sejarah perlakuan, dan suhu curing memberi pengaruh signifikan pada nilai kuat tekan yang dihasilkan. Kesimpulan yang didapatkan adalah beton Portland dan beton geopolimer dengan substitusi kaca sebesar 50% memiliki kuat tekan tertinggi, dan pasta geopolimer dapat melekat pada kaca namun pasta semen tidak.

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ABSTRACT

Glass are good source of amorphous silica and it also has good chemistry composition and precise reactivity to make Pozzolan reaction. So there was an idea to use glass as coarse aggregate in concrete. In this research, two types of concrete will be made, which are Portland concrete and geopolymer concrete with variation of waste glass substitution as much as 0%, 25%, 50%, 100%. The conducted tests are pressure test and macro photos observations. Concrete composition, treatment history, and curing temperature gave significant influence on their compressive strength. The conclusions are both portland and geopolymer concrete with 50% waste glass substitution has the highest compressive strength, and geopolymer paste could adhered to glass but cement paste could not.;Glass are good source of amorphous silica and it also has good chemistry composition and precise reactivity to make Pozzolan reaction. So there was an idea to use glass as coarse aggregate in concrete. In this research, two types of concrete will be made, which are Portland concrete and geopolymer concrete with variation of waste glass substitution as much as 0%, 25%, 50%, 100%. The conducted tests are pressure test and macro photos observations. Concrete composition, treatment history, and curing temperature gave significant influence on their compressive strength. The conclusions are both portland and geopolymer concrete with 50% waste glass substitution has the highest compressive strength, and geopolymer paste could adhered to glass but cement paste could not.;Glass are good source of amorphous silica and it also has good chemistry composition and precise reactivity to make Pozzolan reaction. So there was an idea to use glass as coarse aggregate in concrete. In this research, two types of concrete will be made, which are Portland concrete and geopolymer concrete with variation of waste glass substitution as much as 0%, 25%, 50%, 100%. The conducted tests are pressure test and macro photos observations. Concrete composition, treatment history, and curing temperature gave significant influence on their compressive strength. The conclusions are both portland and geopolymer concrete with 50% waste glass substitution has the highest compressive strength, and geopolymer paste could adhered to glass but cement paste could not.;Glass are good source of amorphous silica and it also has good chemistry composition and precise reactivity to make Pozzolan reaction. So there was an idea to use glass as coarse aggregate in concrete. In this research, two types of concrete will be made, which are Portland concrete and geopolymer concrete with variation of waste glass substitution as much as 0%, 25%, 50%, 100%. The conducted tests are pressure test and macro photos observations. Concrete composition, treatment history, and curing temperature gave significant influence on their compressive strength. The conclusions are both portland and geopolymer concrete with 50% waste glass substitution has the highest compressive strength, and geopolymer paste could adhered to glass but cement paste could not.;Glass are good source of amorphous silica and it also has good chemistry composition and precise reactivity to make Pozzolan reaction. So there was an idea to use glass as coarse aggregate in concrete. In this research, two types of concrete will be made, which are Portland concrete and geopolymer concrete with variation of waste glass substitution as much as 0%, 25%, 50%, 100%. The conducted tests are pressure test and macro photos observations. Concrete composition, treatment history, and curing temperature gave significant influence on their compressive strength. The conclusions are both portland and geopolymer concrete with 50% waste glass substitution has the highest compressive strength, and geopolymer paste could adhered to glass but cement paste could not., Glass are good source of amorphous silica and it also has good chemistry composition and precise reactivity to make Pozzolan reaction. So there was an idea to use glass as coarse aggregate in concrete. In this research, two types of concrete will be made, which are Portland concrete and geopolymer concrete with variation of waste glass substitution as much as 0%, 25%, 50%, 100%. The conducted tests are pressure test and macro photos observations. Concrete composition, treatment history, and curing temperature gave significant influence on their compressive strength. The conclusions are both portland and geopolymer concrete with 50% waste glass substitution has the highest compressive strength, and geopolymer paste could adhered to glass but cement paste could not.]"