scholarly journals Crill: A novel technique to characterize nano-ligno-cellulose

2014 ◽  
Vol 29 (2) ◽  
pp. 190-194 ◽  
Author(s):  
Sinke H. Osong ◽  
Sven Norgren ◽  
Per Engstrand ◽  
Mathias Lundberg ◽  
Peter Hansen
Keyword(s):  
Measurement Technique ◽  
Signal Analysis ◽  
Uv Light ◽  
Optical Response ◽  
Mechanical Pulp ◽  
Novel Technique ◽  
Analogue Signal ◽  
Homogenization Time

Abstract The CrillEye is a technique for qualitatively assessing loose slender and fibrillar particles created during pulping. It has also been demonstrated that the crill measurement technique can easily be used to measure the degree of fibrillation of mechanical pulp based nano-ligno-cellulose (NLC). The measurement technique is based on an optical response of a suspension at two wavelengths of light; UV and IR. The UV light contains information on both fibres and crill, while IR only contains information on fibres. The resolution on the CrillEye module is based on optical response of the pulp and on an analogue signal analysis making it concentration independent. Characterization of particlesize distribution of nano-ligno-cellulose is both important and challenging. The objective of the work presented in this paper was to study the crill values of TMP and CTMP based nano-ligno-celluloses as a function of homogenization time. Results showed that the crill value of both TMP-NLC and CTMP-NLC correlated fairly well with the homogenization time.

scholarly journals Development and characterization of probiotic mucilage based edible films for the preservation of fruits and vegetables

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Seyed Mohammad Davachi ◽  
Neethu Pottackal ◽  
Hooman Torabi ◽  
Alireza Abbaspourrad
Keyword(s):  
Fruits And Vegetables ◽  
Uv Light ◽  
Barrier Properties ◽  
Edible Films ◽  
Food Preservation ◽  
Elongation At Break ◽  
The Public ◽  
Medical Benefits ◽  
Seed Mucilage

AbstractThere is growing interest among the public and scientific community toward the use of probiotics to potentially restore the composition of the gut microbiome. With the aim of preparing eco-friendly probiotic edible films, we explored the addition of probiotics to the seed mucilage films of quince, flax, and basil. These mucilages are natural and compatible blends of different polysaccharides that have demonstrated medical benefits. All three seed mucilage films exhibited high moisture retention regardless of the presence of probiotics, which is needed to help preserve the moisture/freshness of food. Films from flax and quince mucilage were found to be more thermally stable and mechanically robust with higher elastic moduli and elongation at break than basil mucilage films. These films effectively protected fruits against UV light, maintaining the probiotics viability and inactivation rate during storage. Coated fruits and vegetables retained their freshness longer than uncoated produce, while quince-based probiotic films showed the best mechanical, physical, morphological and bacterial viability. This is the first report of the development, characterization and production of 100% natural mucilage-based probiotic edible coatings with enhanced barrier properties for food preservation applications containing probiotics.

Growth and characterization of ammonium nickel-cobalt sulfate Tutton’s salt for UV light applications

2018 ◽  
Vol 487 ◽  
pp. 104-115 ◽  
Author(s):  
Santunu Ghosh ◽  
Michelle Oliveira ◽  
Tiago S. Pacheco ◽  
Genivaldo J. Perpétuo ◽  
Carlos J. Franco
Keyword(s):  
Uv Light ◽  
Cobalt Sulfate ◽  
Nickel Cobalt

Mechanical Characterization of UV Photopolymerized PMMA with Different Photo-Initiator Concentration

2021 ◽  
Vol 903 ◽  
pp. 11-16
Author(s):  
M.A. Manjunath ◽  
K. Naveen ◽  
Prakash Vinod ◽  
N. Balashanmugam ◽  
M.R. Shankar
Keyword(s):  
Mechanical Properties ◽  
Light Source ◽  
Polymethyl Methacrylate ◽  
Biomedical Applications ◽  
Mechanical Characterization ◽  
Uv Light ◽  
Curing Time ◽  
Uv Led ◽  
Pmma Resin

Polymethyl methacrylate (PMMA) is one among few known photo-polymeric resin useful in lithography for fabricating structures having better mechanical properties to meet the requirement in electronics and biomedical applications. This study explores the effect of Photo Initiator (PI) concentration and also curing time on strength and hardness of Polymethyl methacrylate (PMMA) obtained by UV photopolymerization of Methyl methacrylate (MMA) monomer. The UV LED light source operating at the wavelength of 364 nm is used with Benzoin Ethyl Ether (BEE) as photo initiator. The curing of PMMA resin is supported with peltier cooling device placed at the bottom of the UV light source. The characterisation study of UV photo cured PMMA is analysed through nano indenter (Agilent Technologies-G200). The current work investigates the influence of PI concentration and curing time in achieving maximum mechanical properties for UV photopolymerized PMMA.

Evaluation of the Effect of Ultraviolet Light Excitation during Characterization of Silicon Carbide Epitaxial Layers

2018 ◽  
Vol 924 ◽  
pp. 261-264
Author(s):  
Hrishikesh Das ◽  
Swapna Sunkari ◽  
Oener Akdik ◽  
Andrei Konstantinov ◽  
Krister Gumaelius ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Ultraviolet Light ◽  
Defect Detection ◽  
Uv Light ◽  
Surface Treatments ◽  
Uv Laser ◽  
Original State ◽  
Optimal Surface ◽  
Light Excitation

The scanning of Silicon Carbide (SiC) epitaxy wafers for defects by ultraviolet (UV) laser or lamps is widely prevalent. In this work, we document the effects of UV light excitation on the SiC epitaxy material. An increase in background photoluminescence (PL) is observed after repeated scans. The effect of this increase on defect detection is shown. Optimal surface treatments to recover the material back to the original state are demonstrated. Further, some surface treatments are proposed which reduce the effect of the UV light excitation and prevent to a large extent the rise in background PL.

scholarly journals Signal analysis and characterization of a micro-electro-mechanical oscillator for the study of quantum fluids

2014 ◽  
Vol 568 (3) ◽  
pp. 032003 ◽  
Author(s):  
C S Barquist ◽  
J Bauer ◽  
T Edmonds ◽  
P Zheng ◽  
W G Jiang ◽  
...  
Keyword(s):  
Signal Analysis ◽  
Quantum Fluids ◽  
Mechanical Oscillator

scholarly journals Perbandingan Proses Fotodegradasi Pada Zat Warna Metil Jingga Menggunakan Zeolit, Katalis Fe2O3-Zeolit dan Sinar UV

2019 ◽  
Vol 4 (2) ◽  
pp. 71-76
Author(s):  
Pemta Tia Deka
Keyword(s):  
Methyl Orange ◽  
Surface Area ◽  
Zeolite Catalyst ◽  
Uv Light ◽  
Dark Condition ◽  
Characterization Result ◽  
Industry Waste ◽  
Infrared Spectrophotometer ◽  
Preliminary Research

ABSTRAKPencemaran zat warna di lingkungan perairan semakin meningkat. Pencemaran tersebut dapat berasal berbagai sumber diantaranya limbah rumah tangga atau industri farmasi. Zat warna metil jingga merupakan salah satu zat yang digunakan pada industri farmasi dan dapat membahayakan kesehatan manusia sehingga perlu adanya pengolahan yang baik terhadap limbah tersebut. Tujuan dari penelitian ini adalah membandingkan proses fotodegradasi dari zat warna metil jingga menggunakan katalis Fe2O3-zeolit, sinar-UV maupun hanya memakai zeolit. Hasil Karakterisasi katalis Fe2O3-Zeolit dengan menggunakan metilen biru diperoleh luas permukaan spesifik 236,80 m2/g, sedangkan uji menggunakan spektrofotometer FTIR didapatkan bilangan gelombang 520,74 cm-1 yang merupakan karakteristik dari Fe2O3-zeolit. Berdasarkan studi pendahuluan diperoleh kondisi optimum yaitu konsentrasi metil jingga 25 ppm, katalis Fe2O3-zeolit 23,40 mmol/g zeolit serta lama penyinaran 80 menit. Uji fotokatalis dilakukan dengan cara mendispersikan 150 mg Fe2O3-zeolit, 50 mg zeolit teraktifasi ke dalam 60 mL larutan metil jingga, kemudian dimasukkan ke reaktor uv-fotokatalitik. Hasil persen degradasi terbesar diperoleh pada perlakuan penambahan katalis, sinar uv dan pengocokan yaitu 62,96%. Apabila hanya digunakan logam Fe(III) maka didapatkan persen degradasi 36,8%. Kemudian, perlakuan gelap tanpa sinar uv diperoleh persen degradasi paling kecil yaitu 14,82%.Kata kunci: fotodegradasi, zeolit, sinar-Uv, Fe2O3-zeolit, metil jinggaABSTRACTWater contamination in aquatic environment get increased. This contaminaton could happen from various source like home waste or pharmacy industry waste. Methyl orange is one of materials that used in pharmacy industry which could dangering human health so it must be take a good treatment for this waste. The aim of this research is to compare some photocatalytic activity for methyl orange using Fe2O3-zeolit catalyst, uv light and just zeolite. Beside that, Characterization of this catalyst is done by infrared spectrofotometry and surface area by metilen blue. The specific surface area characterization result is 236,80 m2/g then infrared spectrophotometer showed wavennumber at 520,74 cm-1 that specific for Fe2O3-zeolit. Based on preliminary research showed optimum condition at 25 ppm of methyl orange, Fe2O3-zeolit 23,40 mmol/g zeolite and uv radiaton time is 80 minutes.Photodegradation test is done by disper 150 g Fe2O3-zeolit in 60 ml methyl orange then placed in photocatalitic reactor and give uv light. The highest percent degradation result is 62,96%. By adding zeolite, catalyst and shaked. In other hand, the lowest result is 14,82% from dark condition means no uv lightKeywords: Photodegradation, zeolit, Fe2O3-zeolit, methyl orange

scholarly journals Enhancement of UV Light Sensitivity of a Vibrio parahaemolyticus O3:K6 Pandemic Strain Due to Natural Lysogenization by a Telomeric Phage

2009 ◽  
Vol 75 (6) ◽  
pp. 1697-1702 ◽  
Author(s):  
Beatriz Zabala ◽  
Katherine García ◽  
Romilio T. Espejo
Keyword(s):  
Vibrio Parahaemolyticus ◽  
Uv Light ◽  
Bacterial Pathogen ◽  
Light Sensitivity ◽  
Alkaline Extraction ◽  
Clonal Population ◽  
Pandemic Strain ◽  
Clonal Strain ◽  
Similar Restriction

ABSTRACT The Vibrio parahaemolyticus O3:K6 pandemic clonal strain was first observed in southern Chile in 2004 and has since caused approximately 8,000 seafood-related diarrhea cases in this region. The massive proliferation of the original clonal population offers a unique opportunity to study the evolution of a bacterial pathogen in its natural environment by detection and characterization of emerging bacterial variants. Here, we describe a group of pandemic variants characterized by the presence of a 42-kb extrachromosomal DNA that can be recovered by alkaline extraction. Upon treatment with mitomycin C, these variants lyse with production of a myovirus containing DNA of equal size to the plasmid but which cannot be recovered by alkaline extraction. Plasmid and phage DNAs show similar restriction patterns corresponding to enzyme sites in a circular permutation. Sequenced regions showed 81 to 99% nucleotide similarity to bacteriophage VHML of Vibrio harveyi. Altogether these observations indicate that the 42-kb plasmid corresponds to a prophage, consisting of a linear DNA with terminal hairpins of a telomeric temperate phage with a linear genome. Bacteria containing the prophage were 7 to 15 times more sensitive to UV radiation, likely due to phage induction by UV irradiation as plasmid curing restored the original sensitivity. The enhanced UV sensitivity could have a significant role in reducing the survival and propagation capability of the V. parahaemolyticus pandemic strain in the ocean.

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