Applying Differential Scanning Calorimetry to Detergency Studies of Oily Soil

1992 ◽  
Vol 62 (2) ◽  
pp. 101-104 ◽  
Author(s):  
Mamiko Yatagai ◽  
Motoko Komaki ◽  
Toshimasa Hashimoto
Keyword(s):  
Differential Scanning Calorimetry ◽  
Filter Paper ◽  
Soil Removal ◽  
Fibrous Materials ◽  
Oily Soil ◽  
Melting Points ◽  
Scanning Calorimetry ◽  
Dsc Measurements ◽  
Peak Areas ◽  
Polymorphic Forms

Differential scanning calorimetry (DSC) has been applied to studies of oily soil removal from fibrous materials. Fabric and filter paper were soiled with various oily substances present in sebum. After washing, the fibrous samples were subjected to DSC measurements. The residual oily soils on the samples were analyzed by the melting peak areas of the DSC heating curves, a method that is widely applicable to various oily substances with different melting points and polymorphic forms. Various woven or nonwoven fibrous samples can be scanned, regardless of sample size in washing experiments.

Crystallization Behavior of Polyethylene/Montmorillonite Nanocomposites Prepared by In Situ Polymerization

2012 ◽  
Vol 184-185 ◽  
pp. 932-935
Author(s):  
Min Li ◽  
Li Guang Xiao ◽  
Hong Kai Zhao
Keyword(s):  
Differential Scanning Calorimetry ◽  
Crystallization Behavior ◽  
Crystallization Process ◽  
In Situ Polymerization ◽  
Nucleating Agent ◽  
Lower Content ◽  
Melting Points ◽  
Scanning Calorimetry ◽  
Montmorillonite Nanocomposites

Polyethylene/montmorillonite (PE/MMT) nanocomposites were prepared by in situ polymerization. The crystallization behavior of PE/MMT nanocomposites at different MMT concentrations (from 0.1 to 1.2 wt %) were investigated by differential scanning calorimetry (DSC). The equilibrium melting points increase by the addition of MMT. The crystallization rates of PE/MMT nanocomposites are faster than those of pure PE. The addition of MMT facilitated the crystallization of PE, with the MMT functioning as a heterogeneous nucleating agent at lower content; at higher concentrations, however, the physical hindrance of the MMT layers to the motion of PE chains retarded the crystallization process.

Analytical Models for the Systematic Errors of Differential Scanning Calorimetry Instruments

Volume 1 ◽  
2004 ◽  
Author(s):  
Adrian S. Sabau ◽  
Wallace D. Porter
Keyword(s):  
Differential Scanning Calorimetry ◽  
Phase Change ◽  
Computational Analysis ◽  
Systematic Errors ◽  
Analytical Models ◽  
Transition Temperatures ◽  
Scanning Calorimetry ◽  
Heating And Cooling ◽  
Dsc Measurements ◽  
Phase Transition Temperatures

Differential Scanning Calorimetry (DSC) measurements are routinely used to determine enthalpies of phase change, phase transition temperatures, glass transition temperatures, and heat capacities. In order to obtain data on the amount of phases during phase change, time-temperature lags, which are inherent to the measurement process, must be estimated through a computational analysis. An analytical model is proposed for the systematic error of the instrument. Numerical simulation results are compared against experimental data obtained at different heating and cooling rates.

scholarly journals Soil Burial Biodegradation of PLA/Hydrolysed Collagen/Silver Manoparticles Bionanocomposites

2020 ◽  
Vol 71 (4) ◽  
pp. 128-135
Author(s):  
Petruta Preda ◽  
Maria Rapa ◽  
Alexandru Nicoara ◽  
Oana Tutunaru ◽  
Marioara Avram ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Differential Scanning Calorimetry ◽  
Melt Processing ◽  
Scanning Calorimetry ◽  
Degradation Behaviour ◽  
Soil Burial ◽  
Dsc Measurements ◽  
Scanning Electron ◽  
Loss Determination

In this study we evaluated the degradation behaviour of some polymeric bionanocomposites based on polylactic acid (PLA), hydrolysed collagen (HC) and silver nanoparticles (AgNPs) obtained by melt processing, by exposure at soil action for 30 days and 60 days. The quantification of the bionanocomposites� degradability was investigated by the weight loss determination, evaluation of the morphology-Scanning Electron Microscopy (SEM) measurements and the thermal parameters by Differential Scanning Calorimetry (DSC) measurements. From the obtained results we can observe that the polymeric composites based on hydrolysed collagen has degraded.

scholarly journals Assessment of the denaturation of collagen protein concentrates using different techniques

2019 ◽  
Vol 400 (12) ◽  
pp. 1583-1591 ◽  
Author(s):  
Victor Perez-Puyana ◽  
Francisco J. Ostos ◽  
Pilar López-Cornejo ◽  
Alberto Romero ◽  
Antonio Guerrero
Keyword(s):  
Differential Scanning Calorimetry ◽  
Fourier Transform ◽  
Glass Transition ◽  
Infrared Spectroscopy ◽  
Raw Material ◽  
Cd Spectra ◽  
Scanning Calorimetry ◽  
Dsc Measurements ◽  
Collagen Protein ◽  
Α Helix

AbstractThe use of collagen and gelatin in the field of regenerative medicine is widely extended. However, most of the studies in this topic are focused on the scaffolds’ properties, but only a few are related to the properties of the raw material used. The raw material analysis not only consists of a study of the composition, but also of the denaturation degree that can influence the processing and properties of the structure of the scaffold. Thus, the denaturation degree analysis of different collagen proteins was performed and assessed by the comparison of four different methods: differential scanning calorimetry (DSC), Fourier transform Infrared Spectroscopy (FTIR) and circular dichroism (CD) spectra and sulfhydryls content analysis. DSC measurements put forward a glass transition between 88°C and 95°C as well as from the FTIR measurements; the characteristic peaks for proteins are evidenced. However, from the sulfur content, only a small proportion of free sulfhydryls are present with respect to their total amount. In addition, CD spectra allow to estimate the secondary structure of the protein by the analysis of the α-helix and β-strand and also quantify the denaturation degree with the ‘positive/negative ratio’ (RPN) from the CD profiles, obtaining values in the range between 25% and 100%.

scholarly journals Morphological Investigation into Starch Bio-Nanocomposites via Synchrotron Radiation and Differential Scanning Calorimetry

2011 ◽  
Vol 2011 ◽  
pp. 1-14 ◽  
Author(s):  
Huihua Liu ◽  
Deeptangshu Chaudhary ◽  
Joseph John ◽  
Moses O. Tadé
Keyword(s):  
Differential Scanning Calorimetry ◽  
Moisture Content ◽  
Scanning Calorimetry ◽  
Dsc Measurements ◽  
X Ray Scattering ◽  
Free Moisture ◽  
Ternary Interactions ◽  
Diffraction Patterns ◽  
Crystalline Domains ◽  
Crystalline Growth

We studied a hydrophilic, plasticized bionanocomposite system involving sorbitol plasticizer, amylose biopolymer, and montmorillonite (MMT) for the presence of competitive interactions among them at different moisture content. Synchrotron analysisviasmall angle X-ray scattering (SAXS) and thermal analysis using differential scanning calorimetry (DSC) were performed to understand crystalline growth and the distribution of crystalline domains within the samples. The SAXS diffraction patterns showed reduced interhelix spacing in the amylose network indicating strong amylose-sorbitol interactions. Depending on the sorbitol and MMT concentration, these interactions also affected the free moisture content and crystalline domains. Domains of around 95 Å and 312 Å were found in the low-moisture-content samples as compared to a single domain of 95 Å in the high-moisture-content samples. DSC measurements confirmed that the MMT increased the onset and the melting temperature of nanocomposites. Moreover, the results showed that the ternary interactions among sorbitol-amylose-MMT supported the crystalline heterogeneity through secondary nucleation.

Pyridine-catalyzed Halogenation of Aromatic Compounds. II. A Study of the Bromine Adducts of Pyridinium Bromide using Differential Scanning Calorimetry and Isothermal Gravimetric Analysis

1974 ◽  
Vol 52 (14) ◽  
pp. 2560-2565 ◽  
Author(s):  
G. R. Taylor ◽  
H. D. Gesser ◽  
G. E. Dunn
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermogravimetric Analysis ◽  
Phase Diagrams ◽  
General Formula ◽  
Aromatic Compounds ◽  
Gravimetric Analysis ◽  
Melting Points ◽  
Scanning Calorimetry ◽  
Pyridinium Bromide ◽  
Phase Study

The composition and melting points of the bromine adducts of pyridinium bromide have been determined. Differential scanning calorimetry has been found to be particularly well suited to this type of phase study because it uses small, enclosed samples and responds rapidly to small heat changes. The adducts are described in terms of stoichiometric mixtures of pyridinium bromide and pyridinium tribromide, or in terms of a general formula PyHBr(Br2)n where n equals 1/3, 1/2, 2/3, 1, 3, 6, 18. When pyridinium bromide is allowed to pick up bromine isothermally in an apparatus for thermogravimetric analysis it does so in a stepwise manner with a plateau for each of the above adducts plus one with n equal to 3/2. This provides valuable confirmation of the compositions of adducts deduced from conventional phase diagrams.

scholarly journals Synthesis, Polymorphism and Thermal Decomposition Process of (n-C4H9)4NRE(BH4)4 for RE = Ho, Tm and Yb

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1329
Author(s):  
Wojciech Wegner ◽  
Tomasz Jaroń
Keyword(s):  
Thermal Decomposition ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Decomposition Products ◽  
Gaseous Products ◽  
Dsc Measurements ◽  
Unit Cells ◽  
Polymorphic Forms ◽  
Solid Decomposition ◽  
Derivatives Of

In total, three novel organic derivatives of lanthanide borohydrides, n-But4NRE(BH4)4 (TBAREB), RE = Ho, Tm, Yb, have been prepared utilizing mechanochemical synthesis and purified via solvent extraction. Studies by single crystal and powder X-ray diffraction (SC-XRD and PXRD) revealed that they crystalize in two polymorphic forms, α- and β-TBAREB, adopting monoclinic (P21/c) and orthorhombic (Pnna) unit cells, previously found in TBAYB and TBAScB, respectively. Thermal decomposition of these compounds has been investigated using thermogravimetric analysis and differential scanning calorimetry (TGA/DSC) measurements, along with the analysis of the gaseous products with mass spectrometry (MS) and with analysis of the solid decomposition products with PXRD. TBAHoB and TBAYbB melt around 75 °C, which renders them new ionic liquids with relatively low melting points among borohydrides.

scholarly journals Thermal analysis of Li2-хNaxGe4O9 glasses crystallization

2020 ◽  
Vol 28 (2) ◽  
pp. 83-86
Author(s):  
A. O. Diachenko ◽  
D. V. Volynets ◽  
M. P. Trubitsyn ◽  
M. D. Volnianskii
Keyword(s):  
Thermal Analysis ◽  
Solid Solution ◽  
Differential Scanning Calorimetry ◽  
Thermal Gravimetric Analysis ◽  
Single Stage ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Glass Crystallization ◽  
Scanning Calorimetry ◽  
Dsc Measurements

The glasses of lithium-sodium tetragermanate LiNaGe4O9 and solid solution Li1.8Na0.2Ge4O9 were prepared by quenching the melt and crystallized on heating. The glass crystallization was controlled by differential scanning calorimetry and thermal gravimetric analysis. The DSC measurements performed in the range 300–1200 K show that the crystallization of the glasses occurs through a single stage. There are no anomalies on TGA dependences. It is assumed that LiNaGe4O9 and Li 1.8Na0.2Ge4O9 glasses crystallize in accordance with a polymorphic mechanism.

Sign in / Sign up

Export Citation Format

Share Document