Improving the dispersity of detonation nanodiamond: differential scanning calorimetry as a new method of controlling the aggregation state of nanodiamond powders

Nanoscale ◽  
2013 ◽  
Vol 5 (4) ◽  
pp. 1529 ◽  
Author(s):  
Mikhail V. Korobov ◽  
Dmitry S. Volkov ◽  
Natalya V. Avramenko ◽  
Lubov' A. Belyaeva ◽  
Pavel I. Semenyuk ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
New Method ◽  
Detonation Nanodiamond ◽  
Scanning Calorimetry ◽  
Aggregation State

scholarly journals DESORPTION OF IMPURITIES FROM DETONATION NANODIAMOND DURING THE SYNTHESIS OF INTERMATALLIC COMPOUNDS OF THE Ni-Al SYSTEM

2019 ◽  
Vol 62 (12) ◽  
pp. 25-32
Author(s):  
Denis G. Bogdanov ◽  
Vladimir A. Plotnikov ◽  
Sergey V. Makarov ◽  
Alexander S. Bogdanov ◽  
Aleksey A. Chepurov
Keyword(s):  
Mass Spectrometry ◽  
Differential Scanning Calorimetry ◽  
Weight Loss ◽  
Volatile Compounds ◽  
Cleaning Process ◽  
Detonation Nanodiamond ◽  
Scanning Calorimetry ◽  
Federal Research ◽  
Nonmonotonic Change ◽  
Kinetics Of

The results of modification of the impurity subsystem of detonation nanodiamonds (DND) (from the “Altai” Federal Research and Production Center (Biysk)) with active metals and mixtures of nickel and aluminum metals are presented. Samples made from three different metal-diamond mixtures were investigated: 1) 70 wt % of DND and 30 wt % of Al, 2) 50 wt % of DND and 50 wt % of mixture of nickel and aluminum in NiAl stoichiometry, 3) 70 wt % of DND and 30 wt % of mixture of nickel and aluminum in Ni3Al stoichiometry. The heating of samples of nanodiamonds in a vacuum volume (VUP-5) is accompanied by thermal desorption of volatile compounds. Analysis of the samples using differential scanning calorimetry and mass-spectrometry (DSC - on STA 409 PC Luxx NETZSCH, MS - on QMS 403 D Aeolos NETZSCH) allowed us to study the kinetics of desorption and the molecular composition of volatile compounds desorbed by heating nanodiamonds. Annealing of the charge with aluminum is accompanied by a nonmonotonic change in the weight of the sample during heating. Heating mixtures of nanodiamond with nickel and aluminum is accompanied by an almost monotonic decrease in weight. Weight loss at up to 950 °C annealing can reach 20%. When samples are heated to 950 °C, H2O (up to 200 °С), O2 (up to 60 °С), H2S (up to 700 °С), CO2 (up to 600 °С), SO2 (up to 450 °С), N2 (up to 60 °С) evaporate from the surface of the samples. Endo- and exo-effects indicate the occurrence of chemical reactions between impurities and metals. The cleaning process most actively takes place during the annealing of the metal-diamond mixture containing Ni and Al in Ni3Al stoichiometry.

A New Method for Estimating Strength Distribution of Noncovalent Bondings in Coal by Differential Scanning Calorimetry

1994 ◽  
Vol 8 (4) ◽  
pp. 874-880 ◽  
Author(s):  
Kouichi Miura ◽  
Kazuhiro Mae ◽  
Shoji Takebe ◽  
Hideyuki Wakiyasu ◽  
Kenji Hashimoto
Keyword(s):  
Differential Scanning Calorimetry ◽  
Strength Distribution ◽  
New Method ◽  
Scanning Calorimetry

A new method for the measurement of enthalpies of sublimation using differential scanning calorimetry

1988 ◽  
Vol 124 ◽  
pp. 229-233 ◽  
Author(s):  
Luis Alfonso Torres-Gómez ◽  
Guadalupe Barreiro-Rodríguez ◽  
Armando Galarza-Mondragón
Keyword(s):  
Differential Scanning Calorimetry ◽  
New Method ◽  
Scanning Calorimetry ◽  
Enthalpies Of Sublimation

Thermal Stability of N-Heterocycle-Stabilized Iodanes – A Systematic Investigation

2019 ◽  
Author(s):  
Andreas Boelke ◽  
Yulia A. Vlasenko ◽  
Mekhman S. Yusubov ◽  
Boris Nachtsheim ◽  
Pavel Postnikov
Keyword(s):  
Thermal Stability ◽  
Differential Scanning Calorimetry ◽  
Thermogravimetric Analysis ◽  
Systematic Investigation ◽  
Scanning Calorimetry ◽  
Thermal Stability Of

<p>The thermal stability of pseudocyclic and cyclic <i>N</i>-heterocycle-stabilized (hydroxy)aryl- and mesityl(aryl)-l<sup>3</sup>-iodanes (NHIs) through thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) is investigated. NHIs bearing <i>N</i>-heterocycles with a high N/C-ratio such as triazoles show among the lowest descomposition temperatures and the highest decomposition energies. A comparison of NHIs with known (pseudo)cyclic benziodoxolones is made and we further correlated their thermal stability with reactivity in a model oxygenation. </p>

Optimasi Proses Pembuatan dan Karakterisasi Fisik Niosom Sinkonin

2019 ◽  
Vol 16 (2) ◽  
pp. 178
Author(s):  
Hariyanti Hariyanti ◽  
Sophi Damayanti ◽  
Sasanti Tarini
Keyword(s):  
Differential Scanning Calorimetry ◽  
Particle Size ◽  
Hair Follicle ◽  
Scanning Calorimetry ◽  
Span 60

Sinkonin praktis tidak larut dalam air, sedikit larut dalam kloroform dan alkohol. Hal ini berdampak pada rendahnya penetrasi transfollicular sinkonin, karena hanya bahan aktif hidrofilik yang mampu melewati hair follicle. Dengan demikian dibutuhkan satu sistem penghantaran yang mampu menurunkan hidrofobisitas sinkonin untuk meningkatkan penetrasi sinkonin ke follicle. Niosom merupakan vesikel ampifilik dengan struktur lapisan rangkap yang terbentuk dari hidrasi kombinasi surfaktan nonionik dan kolesterol yang mampu menurunkan hidrofobisitas sinkonin. Penelitian ini bertujuan untuk menentukan proses pembuatan niosom sinkonin yang optimum. Pembuatan niosom sinkonin diawali dengan menentukan temperatur gelasi (Tg) dari span 60 dengan Differential Scanning Calorimetry (DSC), kemudian dilanjutkan dengan optimasi proses meliputi: optimasi kecepatan rotavapor pembentukan film lapis tipis, temperatur hidrasi, kecepatan rotavapor hidrasi, waktu hidrasi, dan waktu sonikasi. Karakteristik vesikel niosom yang optimal meliputi: ukuran partikel dan indeks polidispersitas dengan menggunakan Particle Size Analized (PSA) serta efisiensi penjeratan sinkonin dengan menggunakan KCKT. Temperatur gelasi (Tg) span 60 45±2 oC, kecepatan rotavapor pembentukan film lapis tipis niosom 210 rpm, temperatur hidrasi 55±2 oC, kecepatan rotavapor hidrasi 210 rpm, waktu hidrasi 20 menit, waktu sonikasi suspensi niosom 1 menit. Ukuran vesikel yang diperoleh adalah 100–200 nm, indeks polidispersitas 0,2–0,4 dan efisiensi penjeratan niosom sinkonin 84,49±0,0025%. Proses pembuatan niosom sinkonin memiliki pengaruh besar terhadap hasil ukuran vesikel dan efisiensi penjeratan niosom sinkonin.

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