scholarly journals POTENSI EKSTRAK KULIT JERUK KUNCI (Citrus microcarpa Bunge) SEBAGAI BIOREDUKTOR DALAM SINTESIS NANOPARTIKEL PERAK

2021 ◽  
Vol 7 (1) ◽  
pp. 12-20
Author(s):  
Athiah Masykuroh ◽  
Nadia Nia Nurulita
Keyword(s):  
Silver Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Fruit Peel ◽  
Color Test ◽  
Agno3 Solution ◽  
Average Size ◽  
Peel Extract ◽  
Scanning Electron

Nowadays silver nanoparticles (AgNPs) synthesized so often by plant extracts as a reductor. The synthesis of AgNPs was carried out by Citrus microcarpa Bunge fruit peel extract a reductor in various extract concentrations (10, 15, and 20%), concentration of AgNO3 solution of 0.15M and temperature of 700C. The presence of AgNPs was determined by color test and the formation of Surface Plasmon Resonance (SPR) using UV-Vis Spectrophotometer while to determine the morphology and size of the nanoparticles using Scanning Electron  Microscope (SEM). The results of the analysis showed that AgNPs was formed at colloidal phase with dark brown color with wavelengths of 457.30 nm, 478.90 nm, and 422.80 nm for variation concentration of 10, 15 and 20% with slightly spherical, slightly elongated and jagged morphology with average size of 253.8 nm (10%), 254.2 nm (15%) and 253.9 nm (20%).

Preparation of Cr2O3 Nanoparticles via Hydrothermal Reduction of CH3OH

2012 ◽  
Vol 463-464 ◽  
pp. 760-763
Author(s):  
Zhen Zhao Pei ◽  
Hong Bin Xu ◽  
Yi Zhang
Keyword(s):  
Particle Size ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Average Particle Size ◽  
Average Particle ◽  
Calcination Temperatures ◽  
Cr2o3 Nanoparticles ◽  
Average Size ◽  
Hydrothermal Reduction ◽  
Scanning Electron

Nanoparticles of Cr2O3 were successfully obtained via hydrothermal reduction of CH3OH. The oxidant and chromium source was CrO3. The process needs no stirrer or surfactant and the CrO3 concentration was 0.83mol/L. The obtained products were loosely agglomerated Cr2O3 nanoparticles with the average size of 29 to 79 nm. Influences of reactant ratios and calcination temperatures on the specific surface area and average particle size were discussed. And the morphology of nanoparticles was investigated by use of field-emission scanning electron microscope.

Effects of Nano-Sized NiF2 Addition in Bi1.4Pb0.6Sr2Ca2Cu3O10+δ Superconductor

2014 ◽  
Vol 895 ◽  
pp. 87-90 ◽  
Author(s):  
Muhammad Hafiz ◽  
Roslan Abd-Shukor
Keyword(s):  
Electron Microscope ◽  
Critical Temperature ◽  
Scanning Electron Microscope ◽  
Electrical Transport ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Average Size ◽  
20 Nm ◽  
Scanning Electron

The effects of NiF2addition on the superconducting and transport properties of Bi1.4Pb0.6Sr2Ca2Cu3O10+δ(Bi-2223) were studied. Bi-2223 superconductor samples were prepared via conventional nitrate coprecipitation method, and 0.01 wt% - 0.05 wt% of NiF2nanoparticles with average size of 20 nm were added into the samples. The critical temperature (Tc) of each sample was measured by using the four-point probe method. Furthermore, phase formation and the microstructure of the samples were identified using x-ray diffraction method (XRD) and scanning electron microscope (SEM) respectively. The optimumTcwas observed for the sample with 0.04 wt% addition of NiF2. Results of electrical transport measurement are presented.

scholarly journals BIOFUNCTIONALIZATION OF GOLD NANOSHELLS

2018 ◽  
Vol 56 (5) ◽  
Author(s):  
Nghiem Thi Ha Lien
Keyword(s):  
Surface Plasmon Resonance ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Gold Nanoshells ◽  
Functionalized Silica ◽  
Gold Plating ◽  
Plating Method ◽  
Electroless Gold ◽  
Functionalized Silica Nanoparticles ◽  
Scanning Electron

Gold nanoshells were grown on monodispersed and aminopropyltriethoxysilane (APTES) functionalized silica nanoparticles cores with varying sizes ranging from 40-180 nm, which were prepared by Stober route. Gold shells were deposited onto the surface of silica NPs by using tetrakis(hydroxymethyl) phosphonium chloride  and electroless gold plating method. The coverage of the gold nanoshells on the surfaces of the silica NPs was evaluated using surface plasmon resonance spectra and scanning electron microscope.

scholarly journals Aktivitas Antibakteri Membran Nanokomposit Kitosan/Nanopartikel Perak

ALCHEMY ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 26-31
Author(s):  
Doni Notriawan ◽  
Nesbah Nesbah ◽  
Gustria Ernis ◽  
Muhammad Adeng Fadhila ◽  
Risky Hadi Wibowo ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Nanocomposite Membrane ◽  
Nanocomposite Membranes ◽  
E Coli ◽  
Brucea Javanica ◽  
Chitosan Membrane ◽  
Scanning Electron

The aim of this study was to make and test the antibacterial activity of chitosan/silver nanoparticles nanocomposite membranes. Nanocomposite membranes were synthesized by chitosan with pluronic using acetic acid as a solvent. Silver nanoparticles were synthesized using the green synthesis method and the makasar fruit (Brucea javanica L. Merr) peel extract as a bioreductor. The silver nanoparticles were composited with a chitosan/pluronic mixture and printed on a glass plate. Nanocomposite membranes were characterized using the FTIR spectrophotometer and the scanning electron microscope (SEM). Nanocomposite membrane were tested for antibacterial activity against Escherechia coli. The UV-Vis spectra showed the formation of silver nanoparticles which were indicated by the absorption at 454 nm and the absorbance value of 0.405. Characterization using FTIR showed no new functional groups formed in the composites of chitosan and pluronic. SEM results showed the difference between the chitosan membrane and the nanocomposite membrane. The surface of nanocomposite membrane showed uneven compared to the chitosan membrane. Nanocomposite membranes have antibacterial activity to inhibit E. coli growth.   Keywords: nanocomposite, chitosan/silver nanoparticles, antibacterial Penelitian ini bertujuan untuk membuat dan menguji aktivitas antibakteri membran nanokomposit kitosan/nanopartikel perak. Membran nanokomposit dibuat dengan mensintesis kitosan dengan pluronik menggunakan pelarut asam asetat. Nanopartikel perak disintesis menggunakan metode green synthesis dengan ekstrak kulit buah makasar (Brucea javanica L. Merr) sebagai bioreduktor. Nanopartikel perak dikompositkan dengan campuran kitosan/pluronik dan dicetak di atas plat kaca. Membran nanokomposit dikarakterisasi menggunakan spektrofotometer FTIR dan scanning electron microscope (SEM). Membran nanokomposit dilakukan uji aktivitas antibakteri terhadap Escherechia coli. Spektra UV-Vis menunjukkan terbentuknya nanopartikel perak yang ditandai adanya serapan pada panjang gelombang 454 nm dan absorbansi 0,405. Karakterisasi dengan FTIR menunjukkan tidak adanya gugus fungsi baru yang terbentuk pada komposit dari kitosan dan pluronik. Hasil SEM menunjukkan adanya perbedaan antara membran kitosan dengan membran nanokomposit. Permukaan membran nanokomposit terlihat tidak rata dibandingkan membran kitosan. Membran nanokomposit memiliki aktivitas bakteri sehingga dapat mengambat pertumbuhan bakteri E. coli. Kata kunci: nanokomposit, kitosan/nanopartikel perak, antibakteri

scholarly journals In-Situ Biofabrication of Silver Nanoparticles in Ceiba pentandra Natural Fiber Using Entada spiralis Extract with Their Antibacterial and Catalytic Dye Reduction Properties

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1104 ◽  
Author(s):  
Wan Khaima Azira Wan Mat Khalir ◽  
Kamyar Shameli ◽  
Seyed Davoud Jazayeri ◽  
Nor Azizi Othman ◽  
Nurfatehah Wahyuny Che Jusoh ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Natural Fiber ◽  
Ag Nps ◽  
X Ray ◽  
Ceiba Pentandra ◽  
Dye Reduction ◽  
Scanning Electron

It is believed of great interest to incorporate silver nanoparticles (Ag-NPs) into stable supported materials using biological methods to control the adverse properties of nanoscale particles. In this study, in-situ biofabrication of Ag-NPs using Entada spiralis (E. spiralis) aqueous extract in Ceiba pentandra (C. pentandra) fiber as supporting material was used in which, the E. spiralis extract acted as both reducing and stabilizing agents to incorporate Ag-NPs in the C. pentandra fiber. The properties of Ag-NPs incorporated in the C. pentandra fiber (C. pentandra/Ag-NPs) were characterized using UV-visible spectroscopy (UV-vis), X-ray Diffraction (XRD), Field Emission Transmission Electron Microscope (FETEM), Scanning Electron Microscope (Scanning Electron Microscope (SEM), Energy Dispersive X-ray (EDX), Brunauer-Emmett-Teller (BET), Thermogravimetric (TGA) and Fourier Transform Infrared (FTIR) analyses. The average size of Ag-NPs measured using FETEM image was 4.74 nm spherical in shape. The C. pentandra/Ag-NPs was easily separated after application, and could control the release of Ag-NPs to the environment due to its strong attachment in C. pentandra fiber. The C. pentandra/Ag-NPs exposed good qualitative and quantitative antibacterial activities against Staphylococcus aureus (ATCC 25923), Enterococcus faecalis (ATCC 29212), Escherichia coli (ATCC 25922) and Proteus vulgaris (ATCC 33420). The dye catalytic properties of C. pentandra/Ag-NPs revealed the dye reduction time in which it was completed within 4 min for 20 mg/L rhodamine B and 20 min for 20 mg/L methylene blue dye, respectively. Based on the results, it is evident that C. pentandra/Ag-NPs are potentially promising to be applied in wound healing, textile, wastewater treatment, food packaging, labeling and biomedical fields.

scholarly journals IN VITRO CYTOTOXIC STUDY OF GREEN SYNTHESIZED GOLD AND SILVER NANOPARTICLES USING ECLIPTA PROSTRATA (L.) AGAINST HT-29 CELL LINE

2016 ◽  
Vol 9 (5) ◽  
pp. 189 ◽  
Author(s):  
Arvindganth Rajashekar ◽  
Vardhana Janakiraman ◽  
Kathiravan Govindarajan
Keyword(s):  
Silver Nanoparticles ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Cell Line ◽  
Plant Extract ◽  
Biological Synthesis ◽  
Gold And Silver Nanoparticles ◽  
Eclipta Prostrata ◽  
Ht 29 ◽  
Scanning Electron

ABSTRACTObjective: The objective of this study is to synthesize gold and silver nanoparticles using the extracts of Eclipta prostrata.Methods: The nanoparticles synthesize is carried out using the powdered leaves and mixed with distilled water. The filtered extract was then mixedwith aqueous solution of HAuCl4 (1 mM)and AgNo(1 mM), and the reaction volume was made up to 100 ml. Then, the characterization of nanoparticleswas carried out using ultraviolet, infrared, scanning electron microscope, and the cytotoxic activity of the nanoparticles were investigated against HT29cancer cell lines. 3 Results: From the study, it was found that the plant extract was able to synthesize nanoparticles, and the synthesized nanoparticles were found to betoxic against the cancer cell line HT-29.Conclusion: In the present study, both silver and gold nanoparticles were synthesized using the plant extract of E. prostrata. The synthesizednanoparticles were found to be effective against HT 29 cancer cells. The green synthesized nanoparticles were found to be cost-effective, simpler andenvironmentally safe. As the nanotechnology is an emerging field in medicine, the biological synthesis of nanoparticles helps in the other way. Fromthe present study, the nanoparticles synthesized were thus proved against various studies novely. Hope this paves way for the better development ofnanoparticle production in the large scale amount.Keywords: Nanoparticles, Eclipta prostrata, Scanning electron microscope, HT-29 cell line. §Both authors are equally contributed

Synthesis of Silver Nanoparticles by Sparking Process

2016 ◽  
Vol 675-676 ◽  
pp. 73-76
Author(s):  
Thanut Jintakosol
Keyword(s):  
Raman Spectroscopy ◽  
Silver Nanoparticles ◽  
Optical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Low Cost ◽  
Ag Nps ◽  
Spherical Structure ◽  
Atomic Force ◽  
Scanning Electron

Silver nanoparticles (Ag NPs) were synthesized by sparking process. The NPs were continuously deposited onto the substrate by varying the number of sparking cycles ranging from 100-200 and deposited on the glass substrate and annealing at 250-500 °C for 1 hr. The effect of Ag NPs on their structure and optical characteristics were investigated. The optical properties of the NPs have been studied from by Raman spectroscopy and UV-vis spectrophotometer. The morphology of Ag NP was characterized by Scanning Electron Microscope (SEM) and Atomic force microscope (AFM). The results have shown mainly spherical structure of Ag NPs in diameter ranging from 80-100 nm. This study demonstrated that the Ag NPs can be synthesized by sparking process and simply with low cost.

scholarly journals AKTIVITAS ANTI BAKTERI NANO PARTIKEL PERAK (NPP) HASIL BIOSINTESIS MENGGUNAKAN EKSTRAK KELADI SARAWAK Alocasia macrorrhizosTERHADAP Staphylococcus aureus DAN Escherichia coli

2022 ◽  
Vol 7 (1) ◽  
pp. 76-85
Author(s):  
Athiah Masykuroh ◽  
Heny Puspasari
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Surface Plasmon Resonance ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Scanning Electron

Biosintesis Nano partikel perak (NPP) pada penelitian ini dilakukan dengan bantuan ekstrak air tanaman keladi sarawak Alocasia macrorrhizos sebagai bioreduktor dengan variasi konsentrasi larutan AgNO3 sebesar 0,05 M ; 0,10 M dan 0,15 M. Studi keberhasilan pembentukan NPP didasarkan pada pengamatan perubahan warna dan terbentuknya Surface Plasmon Resonance (SPR) dengan bantuan instrumen Spektofotometer UV-Visibel dan Scanning Electron Microscope (SEM). Uji Aktivitas antibakteri dilakukan dengan metode difusi kertas cakram. Hasil analisis menunjukkan bahwa NPP terbentuk maksimum pada panjang gelombang maksimum 450,00 nm yaitu pada variasi konsentrasi larutan AgNO3 0,15 M. Uji morfologi menggunakan SEM menunjukkan partikelnya berbentuk batang (nanorods) dengan ukuran diameter rata-rata masing-masing variasi 826,44 nm (0,05 M), 283,44 nm (0,10 M) dan 266,33 nm (0,15 M). NPP hasil biosintesis menunjukkan aktivitas antibakteri terhadap kedua jenis bakteri Staphylococcus aureus dan Escherichia coli pada pengenceran konsentrasi masing-masing variasi NPP sebesar 50%. Kata kunci :nanopartikel perak, keladi sarawak, staphylococcus aureus, escherichia coli

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