Sintesis Nanokristal Perak Menggunakan Ekstrak Kulit Buah Manggis (Garcinia mangostana L.)

Sintesis nanokristal perak telah berhasil dilakukan menggunakan ekstrak kulit buah manggis (Garcinia mangostana L. ). Proses sintesis dilakukan dengan mencampurkan larutan AgNO3 1 mM dengan 2,5 mL ekstrak kulit buah manggis dan ditambahkan dengan 12 mL PEG 3%. Larutan AgNO3 yang digunakan memiliki variasi 35, 40, 45, 50, dan 60 mL, diaduk dengan menggunakan magnetic stirrer selama 3 jam kemudian dilakukan sintering dengan suhu 500 ˚C selama 1 jam. Sampel dikarakterisasi menggunakan XRD (X-Ray Diffraction), SEM (Scanning Electron Microscope), dan FTIR (Fourier Transform Infrared). Berdasarkan hasil XRD, nanopartikel perak yang dihasilkan memiliki ukuran kristal berkisar antara 32,29 nm – 126,55 nm dengan struktur kristal kubik FCC (Face Centre Cubic). Selai itu, terdapat kecenderungan bahwa semakin kecil volume AgNO3 yang digunakan, ukuran nanokristal perak yang dihasilkan juga akan semakin kecil. Berdasarkan hasil SEM , nanopartikel perak yang dihasilkan masih terdapat gumpalan. Kondisi optimum dengan ukuran kristal paling kecil didapat pada jumlah AgNO3 35 mL dengan ukuran kristal 32,2908 nm.Kata kunci: ekstrak kulit manggis, AgNO3, PEG 6000, nanokristal perak

Solid state batteries (SSBs) prepared with powder metallurgy route

The solid state batteries (SSBs) were prepared by powder metallurgy route. For making SSBs, a special die was designed. LiNiO2 and face centre cubic (fcc) TiB powders [1] were used to make cathodes for SSBs while such metals as Zn or Mg were used to make anodes. The SSBs made with LiNiO2 powder generated relatively low currents (1 to 2 ?A) and voltage (0.4~0.9 V) at room temperature. The SSBs made with fcc-TiB cathode generated more power than do the SSBs made with LiNiO2 powder.

Bring Structural Color to Silk Fabrics

By mimicking the fine structures of butterflies wings and peacocks feathers, we have successfully brought structural color to silk fabrics. The three-dimensional (3D) face centre cubic (FCC) opal or inverse opal structure was constructed on the surface of the silk fabrics by materials assembly. The diversified colors were achieved by precisely controlling the lattice constants of the photonic crystals.

OpenGL’s Application in Solid State Physics Courseware Development

The OpenGL programming is used to develop courseware in solid physics. Firstly, the OpenGL ‘s initialization and Release action at the end of program is a encapsulation of a GLScene control through the C++ Builder’s control development function and add it to the Compoment Palette. Then, according to requirements, some OpenGL function are packaged into a class. Finally, the designed face centre cubic lattice structure courseware is develped. The advantages are really 3d images can be got, the size, location and geometry exercise can be described strictly according to the given parameter or function, and can realize human-computer interaction, real-time describe.