scholarly journals The Effect of Rhodamine B on The Properties of Fluorescent Nanoparticles Derived from Geothermal Silica

2020 ◽  
Vol 9 (3) ◽  
pp. 171-176
Author(s):  
Yovilianda Maulitiva Untoro ◽  
◽  
Diaz Ayu Widyasari ◽  
Edi Supriadi ◽  
Siti Nurul Aisyiyah Jenie ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Rhodamine B ◽  
Sol Gel ◽  
Specific Area ◽  
Ammonium Bromide ◽  
Fluorescent Nanoparticles ◽  
Fluorescent Intensity ◽  
Fluorescent Silica Nanoparticles ◽  
Bet Analysis ◽  
Ft Ir

Rhodamine B can be used as a fluorophore to produce fluorescent silica nanoparticles derived from geothermal sludge. The purpose of this research is to synthesize fluorescent silica nanoparticles (FSNP) modified with rhodamine B and cetyl trimethyl ammonium bromide (CTAB) using sol-gel method. Geothermal waste was used as a precursor and added with NaOH at 900C to generate sodium silicate. Rhodamine B, as the fluorescent dye were added with concentration variations ranging from 0.156 mg/g to 10 mg/g.CTAB was used as template and HCl 2N was applied as gelling catalyst with aging time of 18 hours. Characterization of FSNP was measured using spectrofluorometer to identify the fluorescent intensity, fourier transform infrared (FT-IR) to determine the functional group of FSNP, Brauner-Emmett-Teller (BET) adsorption to calculate the specific area of the particles, X-ray diffraction (XRD) to analyze the crystallographic phases, and transmission electron microscopy (TEM) to analyze the surface morphology of the FSNP. FT-IR and fluorescent intensity results showed that FSNP with 2.5 mg/g of rhodamine B had the optimum characteristics. The FSNP was in amorphous phase with uniform pore distribution. BET analysis showed that the specific surface of the FSNP was 190.22 m2/g.

scholarly journals Functionalized Fluorescent Silica Nanoparticles for Bioimaging of Cancer Cells

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5590
Author(s):  
Ruth Prieto-Montero ◽  
Alberto Katsumiti ◽  
Miren Pilare Cajaraville ◽  
Iñigo López-Arbeloa ◽  
Virginia Martínez-Martínez
Keyword(s):  
Silica Nanoparticles ◽  
Cancer Cells ◽  
Hela Cells ◽  
Sol Gel ◽  
Synthesis Method ◽  
In Vitro Assays ◽  
Quantum Yields ◽  
Fluorescent Nanoparticles ◽  
Fluorescent Silica Nanoparticles

Functionalized fluorescent silica nanoparticles were designed and synthesized to selectively target cancer cells for bioimaging analysis. The synthesis method and characterization of functionalized fluorescent silica nanoparticles (50–60 nm), as well as internalization and subcellular localization in HeLa cells is reported here. The dye, rhodamine 101 (R101) was physically embedded during the sol–gel synthesis. The dye loading was optimized by varying the synthesis conditions (temperature and dye concentration added to the gel) and by the use of different organotriethoxysilanes as a second silica precursor. Additionally, R101, was also covalently bound to the functionalized external surface of the silica nanoparticles. The quantum yields of the dye-doped silica nanoparticles range from 0.25 to 0.50 and demonstrated an enhanced brightness of 230–260 fold respect to the free dye in solution. The shell of the nanoparticles was further decorated with PEG of 2000 Da and folic acid (FA) to ensure good stability in water and to enhance selectivity to cancer cells, respectively. In vitro assays with HeLa cells showed that fluorescent nanoparticles were internalized by cells accumulating exclusively into lysosomes. Quantitative analysis showed a significantly higher accumulation of FA functionalized fluorescent silica nanoparticles compared to nanoparticles without FA, proving that the former may represent good candidates for targeting cancer cells.

Porous TiO2-Al2O3 Photocatalyst: The Effects of Calcination Time

2012 ◽  
Vol 496 ◽  
pp. 165-168 ◽  
Author(s):  
Wen Jie Zhang ◽  
Hong Liang Xin
Keyword(s):  
Composite Materials ◽  
Average Pore Size ◽  
Sol Gel ◽  
Specific Area ◽  
Maximum Activity ◽  
Calcination Time ◽  
Average Pore ◽  
Porous Tio2 ◽  
Al2o3 Composite ◽  
Ft Ir

Porous TiO2-Al2O3 composite materials were prepared through sol-gel method after calcination at 500 oC for different time. FT-IR spectra of porous TiO2-Al2O3 composite materials revealed that the samples are composed of Al2O3 and TiO2. The sample calcinated for 2.5 h had the maximum specific area of 128.9 m2•g-1. High pore volume and average pore size were possessed by the samples calcinated for 1 h and 3 h. While being calcinated at 500 oC, photocatalytic activities of the materials increased at first and then dropped down with the increasing calcination time. The sample calcinated for 3 h showed the maximum activity of 35%.

Synthesis, Structure and Fluorescence Spectrum Studies of Bromocoumarin Derivants: C19H22BrNO6

2011 ◽  
Vol 396-398 ◽  
pp. 1864-1870 ◽  
Author(s):  
Ying Wang ◽  
Xiao Dong Liu ◽  
Zhuo Liu
Keyword(s):  
Fluorescence Spectrum ◽  
Title Compound ◽  
Ph Value ◽  
Cooling Water ◽  
Structural Data ◽  
Molecular Structures ◽  
Ammonium Bromide ◽  
Monoclinic System ◽  
Fluorescent Intensity ◽  
Ft Ir

The title compound has been prepared and characterized by P1PHNMR, FT-IR, fluorescence spectrum and thermal analysis. The crystal and molecular structures of dimethyl-(4-(7-acetoxyl-2H -chromen-2-one))-methyl-(2-acrylate)-ethyl-ammonium bromide were determined by X-ray diffraction methods. The compound crystallizes in Monoclinic system, space group C2/c, with lattice parameters a = 22.799(5), b =12.122(2), c =14.580(3) Å, β = 90.76(3)°, Mr = 440.29, V = 4029.1(14) ÅP3P, Z = 8, Dc= 1.452 g/cmP3P, F(000) = 1808, R = 0.0679 and wR = 0.1450. In the structure, The four N-C bond distances are in the range of 1.473(6) ~ 1.531(6) Å. The P1PHNMR and FT-IR data are in agreement with the structural data. The title compound also shows good fluorescent behaviors. The fluorescent intensity changed little at pH ranging from 7.5 to 9.5. The pH value of the circulation cooling water is in this range so that the title compound can be used in tracer detection.

scholarly journals Silica hybrid biomaterials containing gelatin synthesized by sol-gel method

2010 ◽  
Vol 8 (4) ◽  
pp. 870-876 ◽  
Author(s):  
Georgi Chernev ◽  
Borislava Borisova ◽  
Lyudmila Kabaivanova ◽  
Isabel Salvado
Keyword(s):  
Sol Gel ◽  
Bacterial Cells ◽  
Bet Analysis ◽  
Structure Surface ◽  
Potential Applications ◽  
Ft Ir ◽  
Degradation Activity ◽  
Sol Gel Synthesis ◽  
Hybrid Biomaterials ◽  
Silica Hybrid

AbstractThis work reports the sol-gel synthesis of silica hybrids. We determined the effect of the type and quantity of silica precursors and organic compounds on the resulting structure, surface area, nanostructure design and size, and potential applications. The structure of the synthesized hybrids was analyzed using FT-IR, XRD, BET-Analysis, SEM, and AFM. We demonstrate the immovilization of whole living thermophilic bacterial cells with cyanocompound degradation activity in the synthesized silica hybrid biomaterials by entrapment, chemical binding, and adsorption.

Oxidative Degradation of Rhodamine B Catalysed by Copper Oxide Nanoparticles in Aqueous Medium

2012 ◽  
Vol 584 ◽  
pp. 267-271 ◽  
Author(s):  
Lakshmikanthan Parimala ◽  
J. Santhanalakshmi
Keyword(s):  
Copper Oxide ◽  
Rhodamine B ◽  
Degradation Kinetics ◽  
Sol Gel ◽  
Oxidative Degradation ◽  
Copper Oxide Nanoparticles ◽  
Solution Temperature ◽  
Oxide Nanoparticles ◽  
Size Characterization ◽  
Ft Ir

In the present work , copper oxide nanoparticles are synthesized by wet sol – gel method using sodium hydroxide as the precipitating agent and starch as the capping agent. Size characterization of the nanoparticle was done by TEM, XRD and FT – IR. The as prepared nanoparticles are used as catalyst in the degradation Rhodamine B dye using hydrogen peroxide.The effects of H2O2 dosage, medium pH, solution temperature, and the dye compositions on the degradation kinetics of rhodamine B have been studied. The pH=4 and temperature = 40◦c are the optimized conditions.

Geothermal silica-based fluorescent nanoparticles for the visualization of latent fingerprints

2020 ◽  
Vol 10 (2) ◽  
pp. 258-266
Author(s):  
Aisyiyah S. N. Jenie ◽  
Fransiska S. H. Krismastuti ◽  
Yudia P. Ningrum ◽  
Anis Kristiani ◽  
Mutia D. Yuniati ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Power Plants ◽  
Silica Nanoparticle ◽  
Fluorescent Nanoparticles ◽  
Latent Fingerprints ◽  
Fluorescent Silica Nanoparticles ◽  
Excellent Candidate ◽  
The Fourier Transform ◽  
First Time ◽  
Subsequent Modification

The development of silica nanoparticles from the waste of geothermal power plants and their subsequent modification using a fluorescent dye, rhodamine 6G (R-6G), has been reported. The optimum specific surface area of the silica nanoparticles before modification was 289.2 m2 g–1. After modification, the intrinsic properties of the fluorescent silica nanoparticles were studied, and the results showed that they were in their amorphous phase, with a particle size of 5–10 nm. We proposed that the interaction between R-6G and the silica nanoparticle surface was due to the hydrogen bonding, using the results from the Fourier transform infrared spectroscopy. The obtained fluorescent silica nanoparticles had excellent fluorescence enhancement of 2-fold compared to R-6G in its original state. This study reports, for the first time, the synthesis of fluorescent nanoparticles from geothermal silica and its ability to visualize latent fingerprints on different smooth dry surfaces, making it an excellent candidate for fluorescent powders in forensic applications.

Development of a sensitive immunochromatographic kit using fluorescent silica nanoparticles for rapid serodiagnosis of amebiasis

Parasitology ◽  
2018 ◽  
Vol 145 (14) ◽  
pp. 1890-1895 ◽  
Author(s):  
Hiroshi Tachibana ◽  
Azumi Kakino ◽  
Makoto Kazama ◽  
Meng Feng ◽  
Satomi Asai ◽  
...  
Keyword(s):  
Silica Nanoparticles ◽  
Human Monoclonal Antibody ◽  
Serum Samples ◽  
Fluorescent Intensity ◽  
Fluorescent Silica Nanoparticles ◽  
Freeze Dried ◽  
Antibody Titers ◽  
Indirect Immunofluorescent ◽  
Antibody Tests ◽  
Positive Results

AbstractWe have previously shown that the C-terminal region of the intermediate subunit ofEntamoeba histolyticagalactose- andN-acetyl-D-galactosamine-inhibitable lectin (C-Igl) is a useful antigen for serodiagnosis of amebiasis. An immunochromatographic kit was developed using fluorescent silica nanoparticles coated with C-Igl prepared inEscherichia coli. Samples for examination were added to the freeze-dried particles and then applied to the immunochromatographic device, in which a test line on the membrane was also coated with C-Igl. Fluorescent intensity was measured using a hand-held reader. In an evaluation of the kit using a human monoclonal antibody, the minimum amount of C-Igl specific antibody showing positive results was 100 pg. In the evaluation of serum samples with different antibody titers in indirect immunofluorescent antibody tests in the kit, 20µL of serum was sufficient to obtain positive results at 30 min. Serum samples from symptomatic patients with amebic colitis and amebic liver abscess and those from asymptomaticE. histolytica-cyst carriers showed positive results in the kit. Based on evaluation using sera from healthy controls and patients with other infectious diseases, the sensitivity and specificity of the kit were 100 and 97.6%, respectively. Therefore, we conclude that the newly developed kit is useful for rapid serodiagnosis of amebiasis.

Composite Magnetic Nanoparticles (CuFe2O4) as a New Microsorbent for Extraction of Rhodamine B from Water Samples

2017 ◽  
Vol 100 (5) ◽  
pp. 1539-1543 ◽  
Author(s):  
Ali Roostaie ◽  
Farzad Allahnoori ◽  
Shokooh Ehteshami
Keyword(s):  
Magnetic Nanoparticles ◽  
Rhodamine B ◽  
Tap Water ◽  
Water Solution ◽  
Sol Gel ◽  
Specific Area ◽  
Production Method ◽  
Linear Calibration ◽  
Sem Images ◽  
Dye Extraction

Abstract In this work, novel composite magnetic nanoparticles (CuFe2O4) were synthesizedbased on sol-gel combustion in the laboratory. Next,a simple production method was optimized for the preparation of the copper nanoferrites (CuFe2O4), which are stable in water, magnetically active, and have a high specific area used as sorbent material for organic dye extraction in water solution. CuFe2O4 nanopowders were characterized by field-emission scanning electron microscopy (SEM), FTIR spectroscopy, and energy dispersive X-ray spectroscopy. The size range of the nanoparticles obtained in such conditions was estimated by SEM images to be 35–45 nm. The parameters influencing the extraction of CuFe2O4 nanoparticles, such as desorption solvent, amount of sorbent, desorption time, sample pH, ionic strength, and extraction time, were investigatedand optimized. Under the optimum conditions, a linear calibration curve in the range of 0.75–5.00μg/L with R2 = 0.9996 was obtained. The LOQ (10Sb) and LOD (3Sb) of the method were 0.75 and 0.25 μg/L (n = 3), respectively. The RSD for a water sample spiked with 1 μg/L rhodamine B was 3% (n = 5). The method was applied for the determination of rhodamine B in tap water, dishwashing foam, dishwashing liquid, and shampoo samples. The relative recovery percentages for these samples were in the range of 95–99%.

scholarly journals Preparation of mesoporous ammonium phosphotungstate/silica catalyst and study on the degradation performance of chlorothalonil

2020 ◽  
Author(s):  
Wei Tan ◽  
Yifei Zhang ◽  
Tianli Wang ◽  
Lei Liu ◽  
Junxiu Ye ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Raw Materials ◽  
Aquatic Toxicity ◽  
Sol Gel ◽  
Water System ◽  
Ammonium Bromide ◽  
Alcohol Water ◽  
Ft Ir ◽  
Cetyl Trimethyl Ammonium ◽  
Degradation Effect

Abstract Chlorothalonil is widely used to control fungal diseases and it is usually detected in the environment. Phototransformation is an important process to remove chlorothalonil from the aquatic environment. The mesoporous ammonium phosphotungstate/silica catalyst (NH4PW/SiO2) was synthesized from cetyl trimethyl ammonium bromide (CTAB) and tetraethoxysilane (TEOS) as raw materials by adding insoluble ammonium phosphotungstate into the alkaline alcohol–water system by the sol-gel method. The structure of NH4PW/SiO2 was characterized by X-ray diffractometry (XRD), Brunauer–Emmett–Teller (BET) and Fourier transform infrared spectroscopy (FT-IR). The photocatalytic activity of NH4PW/SiO2 was evaluated by using the organic pesticide chlorothalonil as a model reactant. The result indicated that when the dosage of NH4PW/SiO2 is 0.02 g, the illumination is 180 min, the concentration of chlorothalonil is 5 mg/L, pH = 5, the degradation effect is better, and the degradation rate reaches 83.23%. The results contributed to the understanding of chlorothalonil phototransformation and the potential of mesoporous SiO2 to effectively enhance the photocatalytic activity of NH4PW (64.16%) to reduce aquatic toxicity and pollution by chlorothalonil.

Pemanfaatan Cangkang Pensi (Corbicula Moltkiana) sebagai Bahan Penyerap Zat Warna Rhodamin B Dalam Larutan

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Rahmiana Zein ◽  
Mutia Khuratul Aini ◽  
Hermansyah Aziz
Keyword(s):  
Rhodamine B ◽  
Sem Analysis ◽  
Spectra Analysis ◽  
Biosorption Capacity ◽  
Biosorption Process ◽  
Langmuir Isotherm Model ◽  
Ft Ir ◽  
Cationic Exchange ◽  
Rhodamin B ◽  
Model Isotherm

Biosorpsi zat warna Rhodamine B menggunakan cangkang Pensi (Corbicula moltkiana) telah dikaji. Percobaan dilakukan dengan system batch guna memperoleh kondisi optimum biosorspi zat warna. Kapasitas biosorpsi zat warna pada pH 2 adalah 0.9958 mg/g, dengan konsentrasi larutan mula-mula 150 mg/L waktu kontak 105 menit, massa biosorben 0.1 g, ukuran partikel 32 µm dan temperature pengeringan biosorben pada 75oC. Model isotherm Langmuir menunjukkan bahwa proses penyerapan berlangsung secara kimia dan biosorpsi homogeny dari adsorbat (Rhodamine B) pada permukaan biosorben membentuk lapisan tunggal dengan nilai R2 0.9966. Analisis XRF menunjukkan bahwa penurunan kadar unsur logam pada cangkang Pensi membuktikan bahwa proses biosorpsi berlangsung dengan pertukaran kation. Hasil analisis spektrum FT-IR membuktikan adanya interaksi antaramolekul Rhodamin B dengan gugus fungsi pada cangkang Pensi. Analisis dengan SEM memperlihatkan bahwa pori-pori cangkang Pensi telah terisi penuh oleh molekul Rhodamin B. Kondisi optimum biosorpsi telah diaplikasikan pada limbah kerupuk merah dengan kapasitas penyerapan sebesar 0,2835 mg/g.   The biosorption of Rhodamine B dyes by Pensi (Corbicula moltkiana) shell has been investigated. The experiment was conducted in batch sistem in order to obtain the optimum conditions of dye biosorption. Biosorption capacity of dye was 0.9958 mg/g at pH 2, initial concentration 150 mg/L, contact time 105 minutes, biosorbent mass 0.1 gram, particle size 32 µ m and biosorbent drying temperature was at 75oC. The Langmuir Isotherm model showed chemisorption and homogeneous biosorption process of adsorbates onto the biosorbent surface formed monolayer dye molecules on the biosorbent surface with R2 value was 0.9966. XRF analysis showed that reduction of metals unsure quantity of pensi shell indicated biosorption process was occupied through cationic exchange. The result of FTIR spectra analysis indicated an interaction between Rhodamin B molecules and functional group of pensi shell. SEM analysis showed that the pensi shell pores were completely filled by Rhodamine B molecules. The optimum condition of biosorption has been aplicated in red chips wastewater industry with biosorption capacity was 0.2835 mg/g.

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