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"Serat nata de coco memiliki karakteristik biodegradable, memiliki formasi kristalinitas serat, dan memiliki struktur fisik baik sehingga cocok dikembangkan menjadi material superkuat. Pada penelitian ini dilakukan pemasukan filler nanosilika ke dalam serat nata de coco dengan menggunakan metode post modification (perendaman), serta dipadukan dengan beberapa variasi resin dengan teknik handlay up untuk mendapatkan material komposit yang lebih kuat. Dari hasil pengujian SEM-EDX didapat nanosilika terdistribusi merata di dalam serat, jumlah nanosilika yang masuk ke dalam serat sebanding dengan lama perendaman. Dari hasil uji mekanik didapatkan lama perendaman yang optimum adalah 3 hari karena meningkatkan kuat tarik serat dari 85.6 MPa menjadi 316 MPa. Material komposit yang tertinggi kuat tariknya adalah variasi resin polyamide+epoxy yang mencapai kuat tarik sebesar 96.2 MPa.

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Nata de coco fiber has the characteristic of biodegradable, has a crystallinity of fiber formation, and has a good physical structure so that suitable to be developed into high strength material. In this study has been carried out nanosilica filler dispersing into nata de coco fiber using post modification (immersion) method, and making composite nata de coco fiber with some variation of resin using handlay up technique to get stronger composite materials. From the SEM-EDX results found that nanosilica distributed uniformly in the fibers, amount of nanosilica dispersed in the fiber is proportional to the long of immersion. Mechanical test results showed that the optimum immersion time is 3 days because it increases the tensile strength of fiber from 85.6 MPa to 316 MPa. Composite material with the highest tensile strength is a variation of polyamide+epoxy resin with 96.2 MPa of strength."

"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."

"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."