scholarly journals Modification Effects of B2O3 on The Structure and Catalytic Activity of WO3-UiO-66 Catalyst

Nanomaterials ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 781
Author(s):  
Xinli Yang ◽  
Nan Wu ◽  
Yongxia Miao ◽  
Haobo Li
Keyword(s):  
Electron Microscopy ◽  
Fourier Transform ◽  
Catalytic Activity ◽  
Diffuse Reflectance Spectroscopy ◽  
Synergistic Effects ◽  
Co Adsorption ◽  
Fourier Transform Infrared ◽  
Catalytic Performance ◽  
High Dispersion ◽  
X Ray

Tungsten oxide (WO3) and boron oxide (B2O3) were irreversibly encapsulated into the nanocages of the Zr-based metal organic framework UiO-66, affording a hybrid material B2O3-WO3/UiO-66 by a simple microwave-assisted deposition method. The novel B2O3-WO3/UiO-66 material was systematically characterized by X-ray diffraction, Fourier transform infrared spectroscopy, N2 adsorption, ultraviolet–visible diffuse reflectance spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray phosphorescence, and Fourier transform infrared (FTIR)-CO adsorption methods. It was found that WO3 and B2O3 were highly dispersed in the nanocages of UiO-66, and the morphology and crystal structure of UiO-66 were well preserved. The B2O3 species are wrapped by WO3 species, thus increasing the polymeric degree of the WO3 species, which are mainly located in low-condensed oligomeric environments. Moreover, when compared with WO3/UiO-66, the B2O3-WO3/UiO-66 material has a little weaker acidity, which decreased by 10% upon the B2O3 introduction. The as-obtained novel material exhibits higher catalytic performance in the cyclopentene selective oxidation to glutaraldehyde than WO3/UiO-66. The high catalytic performance was attributed to a proper amount of B2O3 and WO3 with an appropriate acidity, their high dispersion, and the synergistic effects between them. In addition, these oxide species hardly leached in the reaction solution, endowing the catalyst with a good stability. The catalyst could be used for six reaction cycles without an obvious loss of catalytic activity.

PENINGKATAN LAJU DISOLUSI ACYCLOVIR DENGAN METODE SISTEM DISPERSI PADAT MENGGUNAKAN POLOXAMER 188

2016 ◽  
Vol 5 (1) ◽  
pp. 6
Author(s):  
Budi Setiawan ◽  
Erizal Zaini ◽  
Salman Umar
Keyword(s):  
Electron Microscopy ◽  
Thermal Analysis ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Differential Thermal Analysis ◽  
Fourier Transform Infrared ◽  
X Ray Diffraction ◽  
Poloxamer 188 ◽  
X Ray ◽  
Scanning Electron

Sebuah penelitian tentang sistem dispersi padat dari asiklovir dengan poloxamer 188 telah dilakukan formulasi dengan pencampuran secara fisika dengan rasio 1 : 1, 1 : 3, 1 : 5 dan dispersi padat 1 : 1, 1 : 3, 1 : 5 dan penggilingan 1:1 sebagai pembanding. Dispersi padat dibuat menggunakan metode pencairan (fusi), yang digabung dengan poloxamer 188 pada hotplate kemudian asiklovir dimasukkan ke dalam hasil poloxamer 188 lalu di kocok hingga membentuk masa homogen. Semua formula yang terbentuk termasuk asiklovir poloxamer 188 murni dianalisis karakterisasinya dengan Differential Thermal Analysis (DTA), X-ray Diffraction, Scanning Electron Microscopy (SEM), dan Fourier Transform Infrared (FTIR), kemudian pengambilan dilakukan  (penentuan kadar) mengunakan spektrofotometer UV pada panjang gelombang 257,08 nm dan uji laju disolusi dengan aquadest bebas CO2 menggunakan metode dayung. Hasil pengambilan  (penentuan kadar) menunjukkan bahwa semua formula memenuhi persyaratan farmakope Amerika edisi 30 dan farmakope Indonesia edisi 4 yaitu 95-110%. Sedangkan hasil uji laju disolusi untuk campuran fisik 1: 1, dan dispersi padat 1: 1, dan penggilingan 1: 1 menunjukkan peningkatan yang nyata dibandingkan asiklovir murni. Hal ini juga dapat dilihat dari hasil perhitungan statistik  menggunakan analisis varian satu arah  SPSS 17.

scholarly journals Influence of Hydroxyapatite Nanospheres in Dentin Adhesive on the Dentin Bond Integrity and Degree of Conversion: A Scanning Electron Microscopy (SEM), Raman, Fourier Transform-Infrared (FTIR), and Microtensile Study

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2948
Author(s):  
Rana S Al-Hamdan ◽  
Basil Almutairi ◽  
Hiba F Kattan ◽  
Noura A. Alsuwailem ◽  
Imran Farooq ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Study Groups ◽  
Degree Of Conversion ◽  
Hybrid Layer ◽  
X Ray ◽  
And Control ◽  
Scanning Electron

An experimental adhesive incorporated with different nano-hydroxyapatite (n-HA) particle concentrations was synthesized and analyzed for dentin interaction, micro-tensile bond strength (μTBS), and degree of conversion (DC). n-HA powder (5 wt % and 10 wt %) were added in adhesive to yield three groups; gp-1: control experimental adhesive (CEA, 0 wt % HA), gp-2: 5 wt % n-HA (HAA-5%), and gp-3: 10 wt % n-HA (HAA-10%). The morphology of n-HA spheres was evaluated using Scanning Electron Microscopy (SEM). Their interaction in the adhesives was identified with SEM, Energy-Dispersive X-ray (EDX), and Micro-Raman spectroscopy. Teeth were sectioned, divided in study groups, and assessed for μTBS and failure mode. Employing Fourier Transform-Infrared (FTIR) spectroscopy, the DC of the adhesives was assessed. EDX mapping revealed the occurrence of oxygen, calcium, and phosphorus in the HAA-5% and HAA-10% groups. HAA-5% had the greatest μTBS values followed by HAA-10%. The presence of apatite was shown by FTIR spectra and Micro-Raman demonstrated phosphate and carbonate groups for n-HA spheres. The highest DC was observed for the CEA group followed by HAA-5%. n-HA spheres exhibited dentin interaction and formed a hybrid layer with resin tags. HAA-5% demonstrated superior μTBS compared with HAA-10% and control adhesive. The DC for HAA-5% was comparable to control adhesive.

Biocidal activity of curcumin and cationic polymer possessing composites

2020 ◽  
Vol 35 (4-5) ◽  
pp. 389-398
Author(s):  
Tarık Eren ◽  
Gülay Baysal ◽  
Faik Doğan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Curcuma Longa ◽  
Antibacterial Properties ◽  
Fourier Transform Infrared ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

There is a growing interest in new type of biocidal compounds with antibacterial properties against bacteria. In this study, new antibacterial synthetic materials bearing curcumin and cationic polymers were synthesized. In the synthesis stage, the methacrylate functional cationic monomer was synthesized via the Michael addition route by using 3-acryloxy-2-hydroxypropyl methacrylate and 3-amino pyridine to obtain Monomer 1. Monomer 1 was further quaternized with hexyl bromide to obtain a cationic methacrylate functional monomer. Free-radical polymerization of Monomer 1 and methyl acrylate was conducted in the presence of azobisisobutyronitrile under dimethylformamide solvent. The composite formulation was conducted by using turmeric extract Curcuma longa (curcumin), hydroxyapatite, montmorillonite, and silver nitrate. The materials were analyzed by using the methods of X-ray diffraction, nuclear magnetic resonance, Fourier transform infrared spectroscopy, and scanning electron microscopy. The biocidal activities against the bacteria Escherichia coli, Listeria monocytogenes, Salmonella, and Staphylococcus aureus were analyzed using agar well diffusion method. From the Fourier transform infrared, X-ray diffraction, and scanning electron microscopy analysis results of the synthesized nanocomposites, it is seen that they form strong connections with the components added to the composites and form an exfoliated structure. According to the antibacterial analysis results, the nanocomposites obtained have showed a strong antibacterial resistance against E.coli, L.monocytogenes, Salmonella, and S. aureus bacteria, and the high inhibition zone areas were obtained.

Ethylenediamine Processed Cu2SnS3 Nano Particles via Mild Solution Route

2016 ◽  
Vol 19 (1) ◽  
pp. 001-005 ◽  
Author(s):  
Paul Nesamony Prathiba Jeya Helan ◽  
Kannusamy Mohanraj ◽  
Sethuramachandran Thanikaikarasan ◽  
Thaiyan Mahalingam ◽  
Ganesan Sivakumar ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Nano Particles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Electron Microscopy Analysis ◽  
Microscopy Techniques ◽  
Scanning Electron

Copper tin sulphide nanoparticles have been prepared by solution growth technique at various ethylenediamine concentrations. Prepared samples have been characterized using x-ray diffraction, fourier transform infrared, Raman and scanning electron microscopy techniques. x-ray diffraction results revealed that the prepared samples are nanocrystalline in nature with tetragonal structure. Fourier transform infrared spectroscopy analysis results showed the presence of Cu-O, Sn-O and Sn-S vibrations in the wavenumber range between 450 and 620 cm-1. Vibrational symmetry of prepared samples have been analyzed using Raman spectroscopy. Scanning electron microscopy analysis indicated the formation of flower like nanocrystals for samples prepared at various Ethylenediamine concentrations.

Regeneration of the Brewing Spent Diatomite

2014 ◽  
Vol 998-999 ◽  
pp. 1425-1428 ◽  
Author(s):  
Wen Ya Mei ◽  
Teng Hong Hui
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Surface Area ◽  
Fourier Transform Infrared ◽  
X Ray Diffraction ◽  
X Ray ◽  
Remarkable Increase ◽  
Efficient Adsorbent ◽  
Scanning Electron

Brewing spent diatomite (BSDT), a beer industrial by-product, was regenerated with calcination. The characteristics of regenerated BSDT were detected by X-ray diffraction, X-ray fluorescence, Fourier-transform infrared, and scanning electron microscopy. The results showed that the mineralization of the surface adsorbate and the remarkable increase in the Si-OH decreased the pHpzc value from 7.6 to 5.2 and increased the surface area from 36 m2/g to 52 m2/g after calcination at 800 °C. The results show that the regenerated BSTD could be employed as an efficient adsorbent for the recycling of BSDT.

scholarly journals Catalytic performance of Ag, Au and Ag-Au nanoparticles synthesized by lichen extract

2018 ◽  
Vol 7 (5) ◽  
pp. 433-440 ◽  
Author(s):  
Zafer Çıplak ◽  
Ceren Gökalp ◽  
Bengü Getiren ◽  
Atila Yıldız ◽  
Nuray Yıldız
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Fourier Transform ◽  
Catalytic Activity ◽  
Au Nanoparticles ◽  
Bimetallic Nanoparticles ◽  
Catalytic Performance ◽  
Catalytic Activities ◽  
Transmission Electron ◽  
Vis Spectroscopy

Abstract In the present study, the green chemistry approach for the biosynthesis of Ag, Au and Ag-Au bimetallic nanoparticles (NPs) was applied using lichen extract [Cetraria islandica (L.) Ach.]. The lichen extract acts both as a reducing and stabilizing agent. The monometallic and bimetallic NPs were characterized by transmission electron microscopy (TEM), ultraviolet-visible (UV-Vis) spectroscopy and Fourier transform infrared (FTIR) spectroscopy. The results showed that NPs were successfully synthesized and the prepared structures were generally spherical. The synthesized nanostructures exhibited excellent catalytic activities towards reduction of nitrophenols (4-nitrophenol; 4-NP) to aminophenols (4-aminophenol; 4-AP) with sodium borohydride (NaBH4). It was determined that bimetallic NPs exhibit more effective catalytic activity than monometallic Ag and Au nanostructures. This is the first report on 4-NP reduction with Ag, Au and Au-Ag NP catalysts prepared by lichen extract.

scholarly journals Sintesis karboksimetil selulosa dari sisa baglog jamur tiram (Pleurotus ostreatus) (Synthesis of carboxymethyl cellulose from ex-baglog of oyster mushroom (Pleurotus ostreatus))

2018 ◽  
Vol 86 (2) ◽  
Author(s):  
Firda DIMAWARNITA ◽  
TRI - PANJI
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Pleurotus Ostreatus ◽  
Carboxymethyl Cellulose ◽  
Fourier Transform Infrared ◽  
Oyster Mushroom ◽  
Cellulose Content ◽  
X Ray ◽  
Scanning Electron

Oil palm empty fruit bunches (OPEFB) contain high organic materials that can be used as medium for growing white oyster mushroom (Pleurotus ostreatus).Cellulose content in the OPEFB is high (33%), enabling it to be converted to carboxymethyl cellulose (CMC). This study determined the characteristics of the CMC produced from the waste of growth media of oyster mushrooms (baglog). The composition of the baglog consists of 70.3% OPEFB; 23.4% sawdust; 4.5% bran; 1.3% CaCO3; and 0.4% TSP. The CMC was prepared from the ex-baglog of the mushrooms including delignification, alkalization, carboxylation, and characterization of the product using Fourier Transform Infrared Spectroscopy (FTIR), X-Ray Difraction (XRD) and Scanning Electron Microscopy Analysis (SEM). The results showed that the raw material after treatment contained 80.20% a cellulose, 12.32% hemicellulose, and no lignin was found. FTIR-based functional group analysis of the CMC and the commercial CMC was found to be present at 1091,37 cm-1and 1016,84 cm-1for the C-O bond. SEM analysis of the sample with no chemical bleaching for further delignification showed that small impurities were still present. The CMC treated with 10% sodium hydroxide exhibited 0.64 degree of substitution, 43 cP viscosity, and 73.40% purity. Based on these results, ex-baglog of white oyster mushroom can be extracted into CMC.[Keywords:OPEFB, CMC, delignification,  Pleurotus ostreatus, XRD, SEM]. Abstrak Tandan kosong kelapa sawit (TKKS) mengandung bahan organik tinggi yang bisa dijadikan sebagai media pertumbuhan jamur tiram putih (Pleurotus ostreatus). Kandungan selulosa dalam TKKS (33%) yang mungkin dikonversi menjadi karboksimetil selulosa (CMC). Penelitian ini bertujuan mencirikan CMC yang dihasilkan dari limbah media pertumbuhan jamur tiram (baglog). Komposisi baglog sebagai media pertumbuhan jamur tersebut terdiri atas TKKS 70,3%; serbuk gergaji 23,4%; dedak 4,5%; CaCO31,3%; dan TSP 0,4%. Penyiapan CMC dari ex-baglog jamur meliputi delignifikasi, alkalisasi, karboksilasi, dan karakterisasi produk CMC dengan analisis Fourier Transform Infrared Spetroscopy(FTIR), X-Ray Difraction(XRD) dan Scanning Electron Microscopy(SEM). Hasil penelitian menunjukkan bahwa ex-baglog setelah perlakuan mengandung ɑ-selulosa sebanyak 80,20%, hemiselulosa 12,32%, lignin 0%, dan sisanya merupakan impurities(b/b). Gugus fungsi CMC dari TKKS dan CMC komersial memperlihatkan serapan inframerah pada 1091 cm-1dan 1017 cm-1untuk ikatan C-O. Analisis dengan mikroskop elektron menunjukkan bahwa tanpa delignifikasi lebih lanjut, masih ditemukan kotoran. Karakteristik CMC yang diolah dengan natrium hidroksida 10% memiliki derajat substitusi 0,64, viskositas 43 cP, dan kemurnian 73,40%. Hasil tersebut menunjukkan bahwa sisa baglog perumbuhan jamur tiram dapat diekstraksi menjadi CMC.  [Kata kunci:TKKS,  CMC,  delignifikasi,  Pleurotus ostreatus, XRD, SEM].

scholarly journals Sintesis dan Karakterisasi Selulosa Bakteri Tercangkok Poliakrilonitril dan Teramidoksimasi Menggunakan Teknik Pra-iradiasi

2016 ◽  
Vol 11 (1) ◽  
pp. 1 ◽  
Author(s):  
Oktaviani Oktaviani ◽  
Emil Budianto ◽  
Sugiarto Danu
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Acetobacter Xylinum ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermal Gravimetry ◽  
Scanning Electron

Penelitian ini bertujuan untuk mempelajari kopolimerisasi cangkok akrilonitril pada selulosa bakteri (SB) dengan inisiasi radiasi serta penambahan hidroksilamin untuk menghasilkan gugus amidoksim. Pencangkokan akrilonitril pada SB diharapkan dapat meningkatkan ketahanan termal SB. Sedangkan SB yang bersifat sebagai pengkelat ion-ion logam berat, diharapkan dapat dihasilkan melalui penambahan hidroksilamin. Film selulosa bakteri telah berhasil dibuat dari air kelapa yang diinokulasi dengan bakteri Acetobacter xylinum. Film selulosa bakteri (SB) selanjutnya diiradiasi dengan berkas elektron pada rentang dosis 15-120 kGy, laju dosis 15 kGy/pass pada suhu 30 + 1 0C. Setelah diiradiasi, SB tersebut dikopolimerisasi cangkok dengan monomer akrilonitril. Kondisi optimum untuk kopolimerisasi cangkok akrilonitril pada SB adalah pada dosis 75 kGy, suhu 600C, waktu 3 jam, dan konsentrasi akrilonitril 30% b/b. Derajat pencangkokan tertinggi yang diperoleh adalah 56,03 %. Selulosa bakteri tercangkok akrilonitril (SB tercangkok PAN) selanjutnya diamidoksimasi. Amidoksimasi dilakukan dengan penambahan hidroksilamin hidroklorida 6 % b/v dalam pelarut metanol:air = 50:50 v/v pada pH 7, dan diperoleh waktu optimum selama 2 jam dengan densitas gugus amidoksim sebesar 5,425 mmol/ g. Hasil karakterisasi dengan Fourier Transform Infrared (FTIR) menunjukkan adanya spektrum spesifik gugus siano setelah proses pencangkokan akrilonitril pada SB dan intensitasnya menurun setelah diamidoksimasi. Hal tersebut diperkuat dengan hasil uji Scanning Electron Microscopy (SEM) yang memperlihatkan adanya gugus siano yang menempel setelah pencangkokan, dan gugus tersebut tidak terlihat lagi setelah amidoksimasi. Dari hasil uji dengan X-ray Diffraction (XRD), indeks kristalinitas SB tercangkok PAN akan semakin rendah dengan meningkatnya derajat pencangkokan dan pengujian dengan Thermal Gravimetry Analysis (TGA) menunjukkan bahwa ketahanan panas SB tercangkok PAN meningkat.

scholarly journals Sintesis Nanopartikel Nickel Ferrite (NiFe2O4) dengan Metode Kopresipitasi dan Karakterisasi Sifat Kemagnetannya (Halaman 20 s.d. 25)

2015 ◽  
Vol 19 (56) ◽  
Author(s):  
Muflihatun ◽  
Siti Shofiah ◽  
Edi Suharyadi
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Fourier Transform ◽  
Nickel Ferrite ◽  
Fourier Transform Infrared ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

Nanopartikel Nikel Ferit (NiFe2O4) telah disintesis dengan metode kopresipitasi dengan memvariasi konsentrasi NaOH dan suhu sintesis. Struktur kristal, ukuran partikel, dan morfologi dari sampel dianalisa menggunakan X-ray diffraction (XRD) dan transmission electron microscopy (TEM). Ukuran butir pada konsentrasi NaOH 3, 5, dan 10 M masing-masing adalah 5,7; 4,3; dan 4,2 nm, sedangkan pada suhu 60, 80, dan 150°C berturut-turut adalah 4,2; 4,9; dan 5,5 nm. Analisa fourier transform infrared (FTIR) menunjukkan dua puncak serapan pada rentang ~400-600 cm-1 yang terkait dengan site oktahedral dan tetrahedral pada struktur NiFe2O4. Sifat magnetik NiFe2O4 hasil analisa vibrating sample magnetometer (VSM) menunjukkan bahwa sampel berperilaku ferromagnetik dengan nilai koersivitasnya pada rentang 42-47 Oe. Sampel dengan variasi konsentrasi NaOH, koersivitasnya cenderung menurun dengan menurunnya ukuran partikel. Sementara sampel dengan variasi suhu, semakin kecil ukuran partikel, koersivitasnya cenderung meningkat. Pada 15 kOe, nilai magnetisasi terbesar (6,17 emu/g) diperoleh pada sampel dengan rasio fasa α-Fe2O3 paling rendah.

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