International Letters of Chemistry, Physics and Astronomy最新文献_第7页

Preparation and Characterization of Superabsorbent Polymer (SAP) by Graft Polymerization of Carboxymethyl Cellulose 羧甲基纤维素接枝聚合制备高吸水性聚合物(SAP)及其表征

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-09-29 DOI: 10.56431/p-668q5y

A.B.M. Nazmul Islam, Md. Anisul Islam

引用次数: 0

Preparation and Characterization of Superabsorbent Polymer (SAP) by Graft Polymerization of Carboxymethyl Cellulose 羧甲基纤维素接枝聚合制备高吸水性聚合物(SAP)及其表征

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-09-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.70.27

Atif Islam, M. Islam

引用次数: 3

Adsorption of Basic and Acidic Dyes onto Agricultural Wastes 碱性和酸性染料在农业废弃物上的吸附

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-09-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.70.12

N. J. Okorocha, J. J. Okoji, C. Osuji

{"title":"Adsorption of Basic and Acidic Dyes onto Agricultural Wastes","authors":"N. J. Okorocha, J. J. Okoji, C. Osuji","doi":"10.18052/WWW.SCIPRESS.COM/ILCPA.70.12","DOIUrl":"https://doi.org/10.18052/WWW.SCIPRESS.COM/ILCPA.70.12","url":null,"abstract":"The potential of almond leaves powder, (ALP) for the removal of Crystal violet (CV) and Congo red (CR) dyes from aqueous solution was investigated. The adsorbent (ALP) was characterized by FTIR and SEM analysis. Batch adsorption studies were conducted and various parameters such as contact time, adsorbent dosage, initial dye concentration, pH and temperature were studied to observe their effects in the dyes adsorption process. The optimum conditions for the adsorption of CV and CR dyes onto the adsorbent (ALP) was found to be: contact time (100mins), pH (10.0), temperature (343K) for an initial CV dye concentration of 50mg/L using adsorbent dose of 1.0g and contact time (100mins), pH (2.0), temperature (333K) for an initial CR dye concentration of 50mg/L using adsorbent dose 1.0g respectively. The experimental equilibrium adsorption data fitted best and well to the Freundlich isotherm model for both CV and CR dyes adsorption. The maximum adsorption capacity of ALP was found to be 22.96mg/g and 7.77mg/g for the adsorption of CV and CR dyes respectively. The kinetic data conformed to the pseudo-second-order kinetic model. Thermodynamic quantities such as Gibbs free energy (ΔG0), enthalpy (ΔH0) and entropy (ΔS0) were evaluated and the negative values of ΔG0 obtained for both dyes indicate the spontaneous nature of the adsorption process while the positive values of ΔH0 and ΔS0 obtained indicated the endothermic nature and increased randomness during the adsorption process respectively for the adsorption of CV and CR onto ALP. Based on the results obtained such as good adsorption capacity, rapid kinetics, and its low cost, ALP appears to be a promising adsorbent material for the removal of CV and CR dye stuff from aqueous media.","PeriodicalId":14453,"journal":{"name":"International Letters of Chemistry, Physics and Astronomy","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79024577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Study on the Photonic Band Gaps of the Face Centered Cubic Crystals 面心立方晶体光子带隙的研究

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-09-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.70.63

K. Jayawardana, K. Gamalath

{"title":"Study on the Photonic Band Gaps of the Face Centered Cubic Crystals","authors":"K. Jayawardana, K. Gamalath","doi":"10.18052/WWW.SCIPRESS.COM/ILCPA.70.63","DOIUrl":"https://doi.org/10.18052/WWW.SCIPRESS.COM/ILCPA.70.63","url":null,"abstract":"Since the dielectric contrast of photonic crystals play an important role in determining the existence of a photonic gap, the photonic energy bands, density of states of face centered cubic structured photonic crystals formed from spheres of several dielectric materials placed in air were calculated using the plane wave expansion method. A complete band gap was obtained between second and third bands with a gap to mid gap frequency ratio in the range for the dielectric contrast in the range 11-16 with dielectric spheres of radius with a filling factor of 0.134 and fordielectric contrast of 200 with . A complete gap was not found for the dielectric contrast of 3.9. A complete band gap can be obtained for filling factors for the dielectric contrast in the range with an optimum band gap for the filling factor 0.134 while GaAs () has almost a constant optimum band gap in this range. The largest gap to mid gap ratio of was obtained for GaP (). For dielectric spheres of and larger gap to mid gap ratio were obtained for the dielectric contrast while the largest were obtained for . The only dielectric material BaSrTiO3 () which gives a band gap for the filling factor of 0.4524 can be used in microwave applications.","PeriodicalId":14453,"journal":{"name":"International Letters of Chemistry, Physics and Astronomy","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90889943","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Characterization and Antibacterial Behavior of MgO-PEG Nanoparticles Synthesized via Co-Precipitation Method 共沉淀法合成氧化镁-聚乙二醇纳米颗粒的表征及抗菌性能

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-09-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.70.33

V. Karthikeyan, S. Dhanapandian, C. Manoharan

{"title":"Characterization and Antibacterial Behavior of MgO-PEG Nanoparticles Synthesized via Co-Precipitation Method","authors":"V. Karthikeyan, S. Dhanapandian, C. Manoharan","doi":"10.18052/WWW.SCIPRESS.COM/ILCPA.70.33","DOIUrl":"https://doi.org/10.18052/WWW.SCIPRESS.COM/ILCPA.70.33","url":null,"abstract":"A surfactant assisted precipitation method is employed for the preparation of nanostructured magnesium oxide with flake-like nanoparticles. The influence of surfactant on the crystallite size and morphology of MgO was studied using various parameters. The synthesized MgO nanomaterials were characterized by using FTIR, XRD, FE-SEM and EDAX analytical techniques in order to evaluate the formation, crystalline phase morphologies, microstructures and chemical compositions. The powder X-ray power diffraction (XRD) analysis revealed the average crystalline size of 15.34 nm with cubic structure. The crystallite size increased with increasing amount of PEGs. Field Emission Scanning Electron Microscopy (FFSEM) and Transmission Electron Microscopy (TEM) showed that the surfactant strongly affect the size and morphology of nanostructure. Fourier-transform infrared spectroscopy studies indicated the formation of MgO with the characteristic vibration mode of Mg-O. Further, the antibacterial effect of MgO nanoparticles evaluated against pathogenic bacteria by agar diffusion method showed that the nanoparticles have reasonable antibacterial activity against both gram positive (S.aureus) and gram negative (E.coli) pathogenic bacterial strains and retains potential application in pharmaceutical and biomedical industries.","PeriodicalId":14453,"journal":{"name":"International Letters of Chemistry, Physics and Astronomy","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78144408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10

A Novel and Efficient Synthesis of [1,2,3]-Triazolyl Substituted Benzo[c]Coumarins and Evaluation of their Antimicrobial Activity [1,2,3]-三唑基取代苯并[c]香豆素的高效合成及抑菌活性评价

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-09-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.70.1

Neha N. Gohil, Kaushik N. Kundaliya, D. I. Brahmbhatt

引用次数: 0

Synthesis, Characterization and Study of Thermally Stable Fluorescent Polyesters 热稳定荧光聚酯的合成、表征及研究

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-09-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.70.48

D. Vasava, S. Patel

{"title":"Synthesis, Characterization and Study of Thermally Stable Fluorescent Polyesters","authors":"D. Vasava, S. Patel","doi":"10.18052/WWW.SCIPRESS.COM/ILCPA.70.48","DOIUrl":"https://doi.org/10.18052/WWW.SCIPRESS.COM/ILCPA.70.48","url":null,"abstract":"Abstract: Numerous polyesters containing heterocyclic ring have been synthesized by the polycondensation method. Ten Polyesters were synthesised having different aliphatic-aromatic diols in the chain having s-triazine ring as main moiety. The polyesters were synthesized by polycondensation of 6-(N-Piperidinyl)-2,4-bis-(7-Hydroxy-Coumarin-3-carbonyl Chloride)-1,3,5-triazine [PCTC] with aliphatic and aromatic diols. Dark brown, light brown, golden and maroon colour showed by novel synthesized polyesters. The solubility of synthesized polyesters was observed in different solvents. The viscosity was studied for all the polyesters. This polyester showed inherent viscosity ranging from 0.402- 0.709 dlg-1in DMF at 25°C. The synthesized polyesters were characterized by 1H-NMR, FT-IR, fluorescence spectra. Fluorescent polymers are macromolecules with enormous important applications. The measured data indicates the synthesized aliphatic-aromatic fluorescent polyesters, focussing on synthetic methods, properties and applications. Due to their unique mechanical property and workability, their emerging applications involve the fields of fluorescent probe, smart polymer machines, chemo sensors, biological imaging, PH/temperature sensor, drug delivery and in many fields. Moreover high quality fluorescent polymers give widespread application in advanced bio imaging, ultrasensitive molecular diagnosis, and novel light emitting nano devices.","PeriodicalId":14453,"journal":{"name":"International Letters of Chemistry, Physics and Astronomy","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89049955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Synthesis, Characterization and Antibacterial Activity of 2-Phenylsulphonamide Derivatives of Some Amino Acids 2-苯基磺胺类氨基酸衍生物的合成、表征及抗菌活性研究

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-09-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.70.42

C. B. Ikpa, U. Okoro, C. I. Ubochi, Kieran O. Nwanorh

引用次数: 0

Preparation and Study of CdO-CdO2 Nanoparticles for Solar Cells Applications 太阳能电池用CdO-CdO2纳米颗粒的制备与研究

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-08-12 DOI: 10.56431/p-j5s018

Muneer H. Jadduaa, N. Habubi, Alaa Z. Ckal

引用次数: 3

Approach for the Synthesis of Potent Antimicrobials Containing Pyrazole, Pyrimidine and Morpholine Analogues 含吡唑、嘧啶和Morpholine类似物的强效抗菌药物的合成方法

International Letters of Chemistry, Physics and Astronomy Pub Date : 2016-08-01 DOI: 10.18052/WWW.SCIPRESS.COM/ILCPA.69.87

N. Desai, B. Patel, B. Dave

引用次数: 3