Kajian Teoritis Kemampuan Capping Katekin, Kateku Tanat Dan Quarsetin Terhadap Nanopartikel Perak Dengan Menggunakan Metoda DFT-B

Abstract

Interdiffusion mechanism of catechin, catechutannic acid and quercetin are studied by using DFT-B method. But before conducting these experiment, we perform molecular dynamic simulations to find adsorption models probability of each compound. Two models adsorption of quarcetin, four models for catechin and three models for catechutannic acid have been obtained from molecular dynamic simulations. Quantum parameter of each compound, energy and properties adsorption models have been calculated and discussed. The theoretical results were found to be consistent with the experimental data reported. Futhermore, optimization adsorption model samples show that all of adsorbents have weak bonds on the surface of silver nanoparticles. The mechanism can be classified as strong physisorption, so that catechin, catechutannic acid and quercetin can be categorized as good capping agent in synthesis of silver nanoparticles.

Utilization of Uncaria gambir Roxb leaf extract as a reducing agent in the green synthesis of Ag/TiO2 composites and its application for multifunctional towels

“…The morphology of Ag/TiO 2 composites was discovered to have rounded shape particles, as shown in Figures 2(a)–(c). This implies that the composites with gambier leaf extract as a bioreductor function as a stabilizing agent, preventing Ag nanoparticles from aggregation, in comparison to the NaBH 4 reduction 10 in Figure 2(d). The EDS in Figure 2(e) indicates the presence of Ti, O, and Ag in the Ag/TiO 2 composites.…”

“…The difference between the shape and morphology happens because gambier leaf extract has a large content of catechin, which can act as a capping agent to nanoparticles other than being a reducing agent. 10 These capping agents act as stabilizers or binding molecules that prevent agglomeration.…”

Sintesis dan Karakterisasi Magnetik Nanopartikel NiFe2O4 Menggunakan Ekstrak Kulit Buah Naga (Hylocereus Polyrhizus)

“…Data diatas menyatakan bahwa daya magnet nanopartikel semakin tinggi seiring dengan semakin banyaknya penambahan volume ekstrak kulit buah naga, ini di karenakan volume penstabil mempengaruhi nanopartikel yang di hasilkan, jika volume nya rendah maka nanopartikel yang dihasilkan kurang baik dan menyebabkan kekuatan magnetnya kecil. Semakin banyak volume ekstrak buah naga yang ditambahkan maka akan semakin banyak gugus OH yang mampu mencapping atau mengontrol pertumbuhan partikel [15]. Data kekuatan magnet berdasarkan perbandingan Ni 2+ dan Fe 3+ .…”