Hasil Pencarian  ::  Simpan CSV :: Kembali

"Proceedings from the only conference on medical devices that brings together scientists and product, research, design and development engineers from around the globe to present the latest developments in materials, processes, product performance and new technologies for medical/dental devices.This volume includes contributions from the world?s foremost experts from academia, industry, and national laboratories involved in cardiac, vascular, neurological, and orthopaedic implants, dental devices, and surgical instrumentation/devices.Materials addressed include biomedical alloys (stainless steels, titanium alloys, cobalt-chromium alloys, nickel-titanium alloys, noble and refractory metals) biopolymers, bioceramics, surface coatings, and nanomaterials.Topics covered include: degradation, wear fracture, corrosion, processing, biomimetics, biocompatibility, bioelectric phenomena and electrode behavior, surface engineering, and cell-material interactions."

"Seiring dengan pertambahan penduduk, kebutuhan akan energi terus meningkat. Salah satu cara yang dapat dilakukan adalah dengan fotoelektroreduksi CO2 menjadi bahan kimia yang berguna sebagai sumber energi terbarukan menggunakan bantuan cahaya matahari. Material CuBi2O4 dapat menjadi fotokatalis sinar tampak yang baik karena celah pitanya relatif sempit, yaitu sekitar 1,5-1,8 eV. Pada penelitian ini telah berhasil disintesis material CuBi2O4 dengan metode drop-casting dan solvotermal. Strukur kristal CuBi2O4 yang disintesis adalah tetragonal (kusachiite). Energi celah pita yang diperoleh adalah berkisar dari 1,5 hingga 1,8 eV. Hasil CuBi2O4 metode drop-casting tidak 100% murni karena ditandai dengan munculnya puncak milik Bi2O3 pada spektrum XRD. Hasil karakterisasi dengan SEM menunjukkan morfologi material yang dihasilkan membentuk struktur seperti jaringan yang terhubung satu sama lain. Karakterisasi dengan TEM menunjukkan bahwa material kristal yang disintesis adalah polikristalin. Hasil CuBi2O4 metode solvotermal menghasilkan material dengan kemurnian tinggi yang ditunjukkan dari hasil spektrum XRD. Intensitas yang tinggi pada sudut 2θ 27,97o menunjukkan material cenderung tumbuh ke arah bidang 211. Modifikasi FTO/CuBi2O4 dengan bismuth melalui elektrodeposisi menunjukkan hasil yang tidak bagus karena menyebabkan kristal CuBi2O4 terdegradasi. Hal ini dapat dilihat pada difraktogram yang menunjukkan terjadinya penurunan puncak khas dari CuBi2O4.

---

As the population grows, energy demand will continue to increase. One way to solve this problem is by converting CO2 into chemicals that are useful as a source of renewable energy. CuBi2O4 material is a good visible light photocatalyst because the band gap is relatively narrow, which is about 1.5-1.8 eV. In addition, previous studies have shown that bismuth exhibits high performance in reducing CO2 to formate with excellent selectivity. In this research, CuBi2O4 material has been successfully synthesized by drop-casting and solvothermal methods. The crystal structure of CuBi2O4 is tetragonal (kusachiite). The bandgap energy of the material is about 1.5 to 1.8 eV. The results of CuBi2O4 by drop-casting method has low purity because the diffractogram showed a peak belonging to Bi2O3. The SEM images showed the morphology of the resulting material forms a network-like structure. Characterization by TEM showed that the material is polycrystalline. The solvothermal method CuBi2O4 results in high purity materials. The highest peak at 27.97o indicates that the material tends to grow along 211 direction. The modification of FTO/CuBi2O4 with bismuth through electrodeposition method showed poor results because it causes the CuBi2O4 crystal lost its structure. This can be seen on the diffractogram data which shows a significant decrease in the typical peak of CuBi2O4."