Đánh giá các nanocomposite pha trộn dựa trên phụ phẩm nông nghiệp/nanova/vSiO2 cho các ứng dụng cấu trúc: Tính chất vật lý và cơ học so sánh

Silicon - Tập 15 - Trang 7095-7108 - 2023
Matheswaran M.1, Suresh P.2, Velmurugan G.3, Nagaraj M.3
1Department of Mechanical Engineering, Pavai College of Technology, Namakkal, India
2Department of Mechanical Engineering, Muthayammal Engineering College, Namakkal, India
3Institute of Agricultural Engineering, Saveetha School of Engineering, SIMATS, Chennai, India

Tóm tắt

Bột dừa là một trong những loại chất thải nông nghiệp phổ biến nhất ở các vùng ven biển phía Nam của Ấn Độ, nơi mà dừa đóng vai trò quan trọng đối với cả kinh tế và đời sống. Mục tiêu chính của nghiên cứu này là phát triển và thử nghiệm các vật liệu nanocomposite từ chất thải nông nghiệp bột dừa cho các ứng dụng cấu trúc. Phương pháp ép khuôn nóng đã được sử dụng để tạo ra các composite. Phụ gia bột dừa đã được tiền xử lý với dung dịch NaOH 5% trong 4 giờ trước khi sản xuất. Các ảnh hưởng của nano silica (NS) và nano đất sét (NC) ở các nồng độ khác nhau lên các đặc tính hình thái, vật lý và cơ học của nanocomposite dựa trên bột dừa (1.5, 3, và 4.5 wt%) cũng đã được xem xét. Tính chất cơ học tăng lên nhiều nhất ở tải trọng 4.5 wt% NS và 3 wt% NC. Độ dày sưng của composite và khả năng hấp thụ nước đều giảm nhờ sự bổ sung các nanoparticle khác nhau. Việc tích hợp NS ở 1, 3, và 4.5 wt% đã làm giảm khả năng hấp thụ nước sau 20 ngày đồng thời giảm tính thấm nước lần lượt 5, 8, và 18.25%. So với đó, sự bổ sung ở nồng độ cao (4.5% trọng lượng) đã làm tăng hàm lượng ẩm thêm 3.96% do sự kết tụ filler NC, nhưng bổ sung ở 1.5 và 3% trọng lượng đã làm giảm khả năng hấp thụ nước tương ứng 4.21% và 9.01%. Kính hiển vi điện tử quét (SEM) đã được sử dụng để chứng minh sự tương tác của bột dừa với ma trận polymer và tác động của NS và NC lên sự cải thiện độ bám dính. Phổ hồng ngoại biến đổi Fourier (FTIR) được sử dụng để xác định mức độ liên kết giữa bột dừa, tiền xử lý NaOH, và các nanoparticle.

Từ khóa

#bột dừa #chất thải nông nghiệp #nanocomposite #nano silica #nano đất sét #tính chất cơ học

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