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"ABSTRACTThe purpose of this study is to enhance the mechanical and thermal properties of cellulose nanowhiskers nanosilica epoxy hybrid nanocomposites. This research project mainly focusing the addition of nano silica as filler and altering the filler composition by adding cellulose nano whisker which resulted from biodegradable material. In this work, halloysite nanotubes HNTs as new types of nanosilica is used to reinforced epoxy resin due to its hollow nanotubular structure. Epoxy hybrid nanocomposites reinforced with cellulose nano whisker CNWs and halloysite nanotube HNTs have been fabricated and characterized.The researcher suggests that the combination of cellulose nano whisker and halloysite nanotube enhance the mechanical and thermal properties at low filler content.

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ABSTRAKTujuan dari penelitian ini adalah untuk meningkatkan sifat mekanik dan termal nanokhosalin nanoplasikel nanosilika nanokulum selulosa. Proyek penelitian ini terutama memfokuskan penambahan nano silika sebagai pengisi dan mengubah komposisi pengisi dengan menambahkan selulosa nano kumis yang dihasilkan dari bahan biodegradable. Dalam karya ini, nanotube halloysite HNT sebagai tipe baru nanosilika digunakan untuk memperkuat resin epoksi karena struktur nanotubular berongga. Nanokomposit hibrida Epoxy diperkuat dengan CNWs selulosa nano dan HNTs nanotube halloysite telah dibuat dan dikarakterisasi. Peneliti menyarankan bahwa kombinasi kumul nano selulosa dan nanotube halloysite meningkatkan sifat mekanik dan termal pada kandungan filler rendah."

"Rhodamine B merupakan salah satu bahan pewarna yang banyak digunakan dalam industri tekstil,sehingga memungkinkan terjadinya pencemaran air. Penghilangan rhodamine B di dalam air dapat dilakukan dengan fotodegradasi menggunakan fotokatalis berbasis TiO2 yang dimodifikasi. Penelitian ini bertujuan untuk mensintesis TiO2 anatase nanosheet yang didoping Fe dan GO. Fe/TiO2-GO memiliki aktivitas fotodegradasi terhadap rhodamine B dan dikonfirmasi menggunakan UV–vis diffuse reflectance spectroscopy (UV-DRS) dengan perbandingan nilai band gap yang menurun dari 3,15 eV untuk TiO2 menjadi 2,758 eV untuk Fe/TiO2-GO, lalu terdapat peningkatan persentase degradasi sebesar 96 % pada TiO2 menjadi 99,6% pada Fe/TiO2-GO dan nilai Kt pada TiO2 sebesar 3,87 x 10-2 menit-1 menjadi 4,008 x 10-2 menit-1 pada Fe/TiO2-GO fotokatalis juga dikarakterisasi menggunakan Transmission Electron Microscopy (TEM), Raman Spectroschopy, Scanning Electron Microschopy (SEM) dan persentase degradasi rhodamine B diukur dengan UV-VIS Spectrophotometry.......Rhodamine B is one of the dyes that is widely used in the textile industry, thus allowing water pollution. The removal of rhodamine B in air can be carried out by photodegradation using a TiO2-based converting photocatalyst. This study aims to synthesize TiO2 anatase nanosheets doped with Fe and GO. Fe/TiO2-GO has photodegradation activity against rhodamine B and was confirmed using UV–vis diffuse reflectance spectroscopy (UV-DRS) with a band gap ratio that decreased from 3.15 eV for TiO2 to 2.758 eV for Fe/TiO2-GO, then degradation percentage of 96% on TiO2 to 99.6% on Fe/TiO2-GO and the value of Kt on TiO2 of 3.87 x 10-2 minutes-1 to 4,008 x 10-2 minutes-1 on photocatalyst Fe/TiO2-GO also characterized using Transmission Electron Microscopy (TEM), Raman Spectroscopy, Scanning Electron Microscopy (SEM) and the proportion of rhodamine B degradation measured by UV-VIS spectrophotometry."

"The mechanical properties and durability of high-performance concrete can be improved with the use of nanosilica. Still, the relationship between the content of nanosilica and the mechanical properties of concrete needs to be verified in order to develop of compressive strength that can be applied to any concrete mixture. The aim of this study was to develop mathematical equations that account for the relationship among concrete’s compressive strength, the modulus of elasticity with its compressive strength, and the modulus of rupture with its compressive strength. The specimens of ƒ’c80-NS10-SF5 and ƒ’c100-NS10-SF5 were fabricated by mixing natural nanosilica and silica fume, and those of ƒ’c80-NSHD5-SF5 and ƒ’c100-NSHD5-SF5 were fabricated by mixing commercial nanosilica and silica fume as the main composition materials, with the addition of other materials. The compressive strength and indirect tensile strength of the concrete were tested at 1, 3, 7, and 28 days. New mathematical models of generalized compressive strength against concrete age were empirically developed and then validated in order to derive new insights into the substitution of natural nanosilica for commercial nanosilica in the civil-engineering industry."