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Synthesis,Characterization and Water Absorption Analysis of Highly hygroscopic Bio-based Co-polyamides 56/66

Journal of Donghua University(English Edition) 2023年第6期40卷 631-638页

作者：杜瑞满程刊刘涛乌彤秦鸿彬王学利潘星夷冯旭马博谋何勇 State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Material Science and EngineeringDonghua UniversityShanghai 201620China Innovation Center for Textile Science and Technology Donghua UniversityShanghai 201620China The People’s Liberation Army Joint Logistic Support Force Quartermaster Energy Quality Supervision Station Beijing 100071China

This study aims to develop highly hygroscopic bio-based co-polyamides(CPs)by melt co-polycondensation of polyamide(PA)56 salt and PA66 salt with varying molar *** functional groups and the chemical structure of the prepared samples were determined by Fourier transform infrared(FTIR)spectroscopy and proton nuclear magnetic resonance(^(1)H-NMR)*** relative viscosity was determined with an Ubbelohde *** melting behavior and the thermal stability of CPs were investigated by differential scanning calorimetry(DSC)and thermogravimetric analysis(TGA).Furthermore,the water absorption behavior of CP hot-pressed film was *** results reveal that the melting point,the crystallization temperature and the crystallinity of CPs firstly decrease and then increase with the molar fraction of PA66 in *** copolymerization of PA56 with PA66 leads to an obvious increase in water *** CPs with PA66 molar fraction of 50%possess a high saturated water absorption rate of 17.6%,compared to 11.6%for pure PA56 and 7.8%for pure PA66.

关键词： bio-based PA56 hygroscopic co-polyamide(CP) melt polycondensation water absorption

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The Effect of hygroscopic Growth on Continental Aerosols

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Open Journal of Applied Sciences 2013年第6期3卷 381-392页

作者： Bello Idrith Tijjani Aliyu Aliyu Fatima Shuaibu Department of Physics Bayero University Kano Nigeria Department of Science Laboratory Technology School of Technology Kano State Polytechnic Kano Nigeria Girl’s Science and Technical College Kano Nigeria

In this paper, the authors investigated some microphysical and optical properties of continental clean aerosols from OPAC to determine the effect of hygroscopic growth at the spectral range of 0.25 μm to 2.5 μm and eight relative humidities (RHs) (0%, 50%, 70%, 80%, 90%, 95%, 98% and 99%). The microphysical properties extracted were radii, volume mix ratio, number mix ratio and mass mix ratio as a function of RH while the optical properties are scattering and absorption coefficients and asymmetric parameters. Using the microphysical properties, growth factors of the mixtures were determined while using optical properties the enhancement parameters were determined and then parameterized using some models. We observed that the data fitted the models very well. The angstrom coefficients show that the mixture has bimodal type of distribution with the dominance of fine mode particles.

关键词： Microphysical Properties Optical Properties hygroscopic Growth Parametrization Enhancement Parameters Angstrom Coefficients

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Atmospheric Particle hygroscopicity and the Influence by Oxidation State of Organic Aerosols in Urban Beijing

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Journal of Environmental Sciences 2023年第2期124卷 544-556页

作者： Sinan Zhang Xiaojing Shen Junying Sun Yangmei Zhang Xiaoye Zhang Can Xia Xinyao Hu Junting Zhong Jialing Wang Shuo Liu State Key Laboratory of Severe Weather&Key Laboratory of Atmospheric Chemistry of CMA Chinese Academy of Meteorological SciencesBeijing 100081China School of Atmospheric Physics Nanjing University of Information Science&TechnologyNanjing 210044China

A hygroscopic tandem differentialmobility analyser(H-TDMA)was used to observe the sizeresolved hygroscopic characteristics of submicron particles in January and April 2018 in urban *** probability distribution of the hygroscopic growth factor(HGF-PDF)in winter and spring usually showed a bimodal pattern,with more hygroscopic mode(MH)being more *** seasonal variation in particle hygroscopicity was related to the origin of air mass,which received polluted southerly air masses in spring and clean northwesterly air masses in *** showed stronger hygroscopic behaviour during heavy pollution episodes(HPEs)with elevated concentrations of secondary aerosols,especially higher mass fraction of nitrate,which were indicated using the PM2.5(particulate matter with diameter below 2.5μm)mass concentration normalised by CO mass *** hygroscopic parameter(κ)values were calculated using H-TDMA(κhtdma)and chemical composition(κchem).The closure study showed thatκchem was overestimated in winter afternoon when compared withκhtdma,because the organic particle hygroscopic parameter(κorg)was overestimated in the *** was influenced by the presence of a high concentration of hydrocarbon-like organic aerosol(HOA)with a weak water uptake ability.A positive relationship was observed betweenκorg and the ratio of oxygenated organic aerosol(OOA)and HOA,thereby indicating that the strong oxidation state enhanced the hygroscopicity of the *** study revealed the effect of local emission sources and secondary aerosol formation processes on particle hygroscopicity,which is of great significance for understanding the pollution formation mechanism in the North China Plain.

关键词： H-TDMA hygroscopic parameter (κ) Organic aerosols Oxidation state Heavy pollution episode (HPE)

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Thermal expansion properties and hygro-scopicity of Y_(2-x)Sm_xW_3O_(12) (x=0.0-0.4) compounds

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Science China(Technological Sciences) 2008年第1期51卷 25-32页

作者： YU ZhouXiang1, PENG Jie2, WANG Hui2, WU MeiMei2, CHENG YingZhi2, HU ZhongBo2 & CHEN DongFeng1 1 China Institute of Atomic Energy, P.O. Box 275 (30), Beijing 102413, China 2 College of Chemistry and Chemical Engineering, Graduate University of Chinese Academy of Sciences, Beijing 100049, China China Institute of Atomic Energy Beijing China College of Chemistry and Chemical Engineering Graduate University of Chinese Academy of Sciences Beijing China

A novel class of solid solutions of Y2-xSmxW3O12 (x = 0.0–0.4) were synthesized and studied by means of powder X-ray diffraction. All samples crystallize in an ortho- rhombic space group Pnca. The lattice parameters a, b and c of Y2-xSmxW3O12 in- crease with increasing Sm content. Since the compounds of this series hydrate at room temperature, thermogravimetric (TG) analysis was carried out. The result shows that the compound stores less water with increasing Sm content. The thermal expansion properties of Y2-xSmxW3O12 (x = 0.1, 0.3 and 0.4) were investi- gated with high temperature X-ray diffraction. Negative thermal expansion coeffi- cient αl becomes less negative from -6.644×10-6 to -6.211×10-6℃-1 when x changes from 0.1 to 0.4.

关键词： rare earth tungstates negative thermal expansion hygroscopic XRD

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The Effect of Relative Humidity on Maritime Tropical Aerosols

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Open Journal of Applied Sciences 2014年第6期4卷 299-322页

作者： Bello Idrith Tijjani Fatima Sha'aibu Aliyu Aliyu Department of Physics Bayero University Kano Nigeria Department of Science Laboratory Technology School of Technology Kano State Polytechnic Kano Nigeria Girl’s Science and Technical College Kano Nigeria

The present work focused on the effect of relative humidity (RH) on some microphysical and optical properties of maritime tropical aerosols from the software package OPAC (Optical Properties of Aerosols and Clouds) data at the spectral range of 0.25 μm to 2.5 μm and eight relative humidities (0%, 50%, 70%, 80%, 90%, 95%, 98%, and 99%). The microphysical properties extracted were radii, volume mix ratio, number mix ratio and mass mix ratio as a function of RH while the optical properties were optical depth, extinction, scattering and absorption coefficients single scattering albedo, refractive indices and asymmetric parameters. The hygroscopic growth and enhancement parameters were then parameterized by using some models to determine the hygroscopicity, bulk hygroscopicity, humidification factors and some other parameters that depend on RH and/or wavelengths. The results showed that the data fitted our models very well and can be used to extrapolate the hygroscopic growth at any RH and enhancement parameters at any RH and wavelengths. The importance of determining gfmix(RH) as a function of RH and volume fractions, mass fractions and number fractions, and enhancement parameters as a function of RH. The effective radii increases with the increase in RH, while Angstrom coefficients decrease with the increase in RH and this signifies the dominance of coarse mode particles. The angstrom coefficients show that the mixture has bimodal type of distribution and the mode size increases with the increase in RH.

关键词： Microphysical Properties Optical Properties hygroscopic Growth Parametrization Enhancement Parameters Angstrom Coefficients Effective Refractive Indices

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The Effect of Relative Humidity on Continental Average Aerosols

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Open Journal of Applied Sciences 2014年第7期4卷 399-423页

作者： Bello Idrith Tijjani Aliyu Aliyu Fatima Sha’aibu Department of Physics Bayero University Kano Nigeria Department of Science Laboratory Technology School of Technology Kano State Polytechnic Kano Nigeria Girl’s Science and Technical College Kano Nigeria

In this paper, the authors extracted and investigated the effect of relative humidity (RH) on some microphysical and optical properties of continental polluted aerosols from OPAC (Optical Properties of Aerosols and Clouds) at the spectral range of 0.25 μm to 2.5 μm and eight relative humidities (0%, 50%, 70%, 80%, 90%, 95%, 98%, and 99%). The microphysical properties extracted were radii, volume, number and mass mix ratios as functions of RH while the optical properties were optical depth, extinction, scattering and absorption coefficients single scattering albedo, refractive indices and asymmetric parameters also at eight RHs. Using the microphysical properties, effective hygroscopic growth factors and effective radii of the mixtures were determined while using optical properties we determined the enhancement parameters, effective refractive indices and angstrom coefficients. Using the effective hygroscopic growth, we determined the dependence of the effective hygroscopicity parameter as a function of RH, while using enhancement parameters;we determined the effect of humidification factor on RH and wavelengths. The effective hygroscopic growth and enhancement parameters were then parameterized using some models to determine the effective hygroscopicity parameter, bulk hygroscopicity and humidification factors. We observed that the data fitted the models very well. The effective radii decrease with the increase in RH while the effective hygroscopic growth increases with the increase in RH, and this is in line with the increase in angstrom parameters, and this shows increase in mode size with the increase in RH. The angstrom coefficients show that the mixture has a bimodal type of distribution with the dominance of fine mode particles.

关键词： Microphysical Properties Optical Properties hygroscopic Growth Parametrization Enhancement Parameters Angstrom Coefficients Effective Refractive Indices

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An Experimental Study On Drying Behaviour Of High And Low Tack Offset Ink With Normal Fountain Solution On Baggase Based Uncoated Papers During Perfecting Printing And Its Impact On Carbonfoot Print

An Experimental Study On Drying Behaviour Of High And Low Ta...

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2011 World Congress on Engineering and Technology(CET 2011)

作者： Amrutharaj Harikrishnan Rajendrakumar Anayath Print media academy Heidelberg(I) Pvt.Ltd.ChennaiIndia Print Media Academy Heidelberg(I) Pvt.Ltd.ChennaiIndi

This Majority of the present day printing jobs demand double sided printing sometimes single colour on both sides or multi colour on both *** India there are very few presses with 4 by 4 printing facilities to finish multi colour printing on both sides in one *** many times the one sided printed pile undergo a waiting time before the reversal *** study will help us to understand how to reduce the carbon foot print and the time delay influences in back trapping or smearing on to the impression cylinder of ink with low tack and high tack ink.

关键词： bagasse bottom wire side offset printing perfect printing alkaline paper runnability fountain flow high and low tack hygroscopic oliophilic.

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