Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "PH" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 376
Tytuł:
Microstructure and texture welds of 15-7Mo steel after heat treatment
Mikrostruktura i tekstura spoin stali 15-7Mo po obróbce cieplnej
Autorzy:
Ziewiec, A.
Zielińska-Lipiec, A.
Witkowska, M.
Powiązania:
https://bibliotekanauki.pl/articles/264029.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
semi-austenitic PH steels
XRD
welds
heat treatment
15-7Mo steel
stale półaustenityczne umacniane wydzieleniowo
spoiny
obróbka cieplna
stal 15-7Mo
Opis:
This paper presents the results of determining the effect of heat treatment after welding X8CrNiMoAl15-7-2 steel (commercial name: PH 15-7Mo steel) on the microstructure and texture of the welds. XRD studies showed the presence of the two phases in the welds of 15-7Mo steel; i.e., δ ferrite and austenite. Annealing at a temperature of 400°C/1 h and 550°C/1 h results in changes of the intensities for individual peaks derived from austenite and ferrite. Microstructure investigations carried out by LM and TEM indicated that the austenite and δ ferrite coexist in the microstructure of 15-7Mo steel in as-welded condition. Annealing at a temperature range of between 400–620°C after welding causes small changes in the microstructure. The hardness of the welds after annealing in that temperature range increases.
W artykule zostały zaprezentowane wyniki badań wpływu obróbki cieplnej po spawaniu stali X8CrNiMoAl15-7-2 (nazwa handlowa: PH 15-7Mo) na mikrostrukturę i teksturę spoin. Badania XRD wykazały obecność dwóch faz w spoinach stali 15-7Mo, tj. ferrytu δ i austenitu. Wyżarzanie w temperaturach 400°C przez 1 h i 550°C przez 1 h powoduje zmiany intensywności poszczególnych pików pochodzących od austenitu i ferrytu. Badania mikrostrukturalne (mikroskopia świetlna i transmisyjna mikroskopia elektronowa) potwierdziły obecność ferrytu δ i austenitu w stali 15-7Mo w stanie po spawaniu. Wyżarzanie po spawaniu w temperaturach pomiędzy 400°C a 620°C powoduje małe zmiany w mikrostrukturze. Twardość spoin po wyżarzaniu w zakresie tych temperatur wzrasta.
Źródło:
Metallurgy and Foundry Engineering; 2016, 42, 4; 225-232
1230-2325
2300-8377
Pojawia się w:
Metallurgy and Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Microstructure of Welded Joints of X5CrNiCuNb16-4 (17-4 PH) Martensitic Stainlees Steel After Heat Treatment
Mikrostruktura złącz spawanych stali nierdzewnej martenzytycznej X5CrNiCuNb16-4 (17-4PH) po obróbce cieplnej
Autorzy:
Ziewiec, A.
Zielińska-Lipiec, A.
Tasak, E.
Powiązania:
https://bibliotekanauki.pl/articles/355711.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
weld metal
heat treatment
martensitic PH stainless steels
17-4PH steel
spoiwa
obróbka cieplna
stale nierdzewne martenzytyczne PH
stal 17-4 PH
Opis:
The paper presents rezults of microstructure (LM, TEM) investigation and hardness measurments of welded joints in martensitic precipitation hardened stainless steel containing copper, subjected to heat treatment. For the aging temperature up to 540°C even for the very long times, the microstructure of the welded joints is similar to this one at lower temerature aging. After aging at 620°C a distinct change of the microstructure was observed. Non-equilibrium solidification conditions of the weld metal, segregation and the diffusion of copper and the elements stablilizing the austenite cause the occurrence of the reverse transformation of the martensite into austenite as fast as just 1 hour at 620°C. TEM investigations revealed the differences in dispersion of hardening copper precipitates after aging at temperature 620°C for 1 and 4 hours.
W artykule przedstawiono wyniki badań mikrostruktury (LM, TEM) oraz twardości złącz spawanych stali nierdzewnej martenzytycznej utwardzanej wydzieleniowo miedzią po obróbce cieplnej. Aż do temperatury starzenia 540° C mikrostruktura spoin nie wykazuje istotnych różnic niezależnie od czasu wytrzymania w porównaniu do tej obserwowanej w niższych temperaturach. Po starzeniu w temperaturze 620°C zaobserwowano wyraźne różnice w mikrostrukturze spoin. Nierównowagowe warunki krzepnięcia metalu spoiny, występowanie segregacji oraz procesy dyfuzji miedzi i pierwiastków stabilizujących austenit powodują wystąpienie przemiany odwrotnej martenzytu w austenit już po 1 godzinie starzenia w 620°C. Badania TEM wykazały, różnice w dyspersji cząstek umacniających w temperaturze starzenia 620°C przez 1 i 4 godziny.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 3; 965-970
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of the Weldability of Austenitic PH Steel for Power Plants
Autorzy:
Ziewiec, A.
Powiązania:
https://bibliotekanauki.pl/articles/356689.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power plants
Super 304H
DMV 304HCu steel
X10CrNiCuNb18-9-3 steel
austenitic PH stainless steels
hot cracking
Opis:
The article presents the results of Transvarestraint test of a modern precipitation hardened steel X10CrNiCuNb18-9-3 with copper. For comparison, the results of tests of conventional steel without the addition of copper X5CrNi18-10 are presented. The total length of all cracks and the maximum length of cracks were measured. The study of microstructure (LM, SEM) showed that the austenitic stainless steel X10CrNiCuNb18-9-3 is very prone to hot cracking. After performing the Transvarestraint tests three types of cracks were observed: solidification cracks occurring during crystallization, liquation cracks due to segregation in the heat affected zone (HAZ) and surface cracks. Niobium carbonitrides dispersed in the bands of segregation are the reason of high susceptibility to liquation cracking. Segregation of copper occurring during solidification causes of surface cracking. A combined effect of copper and stresses contributes to formation of hot microcracks. These microcracks propagate to a depth of 20-30 μm.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 2B; 1109-1114
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Welded joint cracking in martensitic stainless steel precipitation-sthregthened with copper
Pękanie złącz spawanych stali nierdzewnej martenzytycznej utwardzanej wydzieleniowo miedzią
Autorzy:
Ziewiec, A.
Czech, J.
Tasak, E.
Powiązania:
https://bibliotekanauki.pl/articles/356169.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
17-4PH grade
Weldability Testing
copper
liquid metal embrittlement
stainless steel
GTAW
fracture
Opis:
Problem of welded joint cracking in the HAZ of Cu strengthened 17-4PH grade precipitation hardening martensitic stainless steel is presented. Hypothesis concerning hydrogen embrittlement origin of the cracks is opposed. It was concluded that the cracks located in the high-temperature zone of the HAZ exhibit characteristics of hot cracks which originated as a result of steel embrittlement in the presence of Cu rich liquid phase. The mechanism of steel surface enrichment in Cu is proposed. Practical methods of cracks elimination are presented.
W artykule przedstawiono problem pękania w strefie wpływu ciepła stali nierdzewnej martenzytycznej utwardzanej wydzieleniowo miedzią. Podważono literaturowe informacje wskazując, ze sa to pęknięcia zimne spowodowane kruchością wodorowa. Stwierdzono, ze pęknięcia zlokalizowane w wysokotemperaturowym obszarze SWC maja charakter pęknięć gorących i powstały w wyniku kruchości stali w obecności cieczy bogatej w miedz. Wyjaśniono mechanizm wzbogacania się powierzchni stali w miedz oraz podano technologiczny sposób eliminacji pęknięć.
Źródło:
Archives of Metallurgy and Materials; 2012, 57, 4; 1055-1061
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of internal polyurethane coatings of cast iron pipes on the quality of transported potable water
Autorzy:
Zielina, Michał
Młyńska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2171838.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
drinking water
polyurethane coating
iron
pH value
CV
coefficient of variation
woda pitna
powłoka poliuretanowa
żeliwo
wartość pH
współczynnik zmienności
Opis:
The paper presents the results of laboratory tests to determine the effect of an internal polyurethane coating in ductile iron pipes on the quality of disinfected and non-disinfected drinking water. A decrease in the pH of water in contact with the polyurethane coating was found, which was slightly higher in the non-disinfected water than in the disinfected water. The coefficient of variation (CV) of the pH values for the chlorinated water samples was 5.02% and for the non-chlorinated water was 7.15%. The experiments also showed a rather large effect of polyurethane liner on the increase of TOC concentration in water. The presence of disinfectant further slightly increased the amount of organic compounds released. The CV values normalized to one day for TOC were as high as 193.32% and even 199.39% for disinfected water. A significant effect of polyurethane coating was observed on the color change and odor of water. On the other hand, there was no effect of polyurethane coating on alkalinity and chlorine consumption in water. The CV values normalized to one day in both cases were very small at 0.97% and 0.53%, respectively.
Źródło:
Environment Protection Engineering; 2022, 48, 3; 25--38
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of pH and time on hydrodynamic properties of dodecylamine
Autorzy:
Zhou, X.
Tan, Y. H.
Finch, J. A.
Powiązania:
https://bibliotekanauki.pl/articles/109853.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
pH
dodecylamine
gas holdup
froth height
Frother function
Opis:
Gas holdup and froth height in the presence of dodecylamine (DDA, pKa = 10.63) are reported at three pH values. The results revealed a strong time effect for DDA: stability was reached at pH 3; not at natural pH, for example, gas holdup declining to the water only value; and at pH 11, while stability was reached quickly gas holdup was now less than in water alone indicating coalescence. In the first two cases, the time effect is attributed to loss of amine from the system as molecular amine, observed at natural pH as precipitates on the column wall. An argument for precipitation at pH < pKa is presented. At pH 11, coalescence is attributed to the oily nature of the molecular amine present as colloidal aggregates. Noting a difference in literature steady state gas holdup data at natural pH, it is speculated that varying steady states can be reached that corresponds to different levels of amine loss.
Źródło:
Physicochemical Problems of Mineral Processing; 2018, 54, 4; 1237-1244
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Trapping of Charge Carriers in Organic Molecular Materials: Phthalocyanine Thin Films Revisited
Autorzy:
Zhivkov, I.
Nešpurek, S.
Sworakowski, J.
Powiązania:
https://bibliotekanauki.pl/articles/2030420.pdf
Data publikacji:
2001-12
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
71.20.Rv
72.20.Jv
72.80.Le
73.61.Ph
Opis:
The technique of temperature-modulated space-charge-limited currents was employed to study the energetic distribution of local states in thin films of metal-free phthalocyanine. Four well-defined local levels were detected within the energy range 0.5-0.3 eV, accompanied by an onset to a manifold of shallower states. The morphology of the films, depending on the deposition rate and changing from polycrystalline to nearly amorphous, affects the densities of local states but not their energies.
Źródło:
Acta Physica Polonica A; 2001, 100, Supplement; 215-228
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects Of Anodic Protection On SCC Behavior Of X80 Pipeline Steel In High-pH Carbonate-Bicarbonate Solution
Wpływ ochrony anodowej na naprężeniowe pękanie korozyjne stali typu X80 z zastosowaniem na rurociągi w roztworze buforowym o wysokim pH
Autorzy:
Zhao, W.
Zou, Y.
Xia, D. X.
Zou, Z. D.
Powiązania:
https://bibliotekanauki.pl/articles/354869.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
X80 pipeline steel
stress corrosion cracking
high-pH solution
anodic protection
stal typu X80
naprężeniowe pękanie korozyjne
roztwór o wysokim pH
ochrona anodowa
Opis:
The potentiodynamic polarization test and slow strain rate tensile tests of X80 pipeline steel were performed in 0.5M Na2CO3-1M NaHCO3 solution to study the electrochemical and stress corrosion cracking properties. The results of potentiodynamic polarization test show that there is an obvious stable passive region, about from 0v to 0.8V (SCE), indicating that anodic protection is feasible. The results of slow strain rate tensile tests show that the stress corrosion cracking sensibility is high and cathodic protection effect is restricted due to the hydrogen permeation. However, the elongation, yielding strength and tensile strength all increase with anodic protection. The higher anodic protection potential in the stable passive region is benefit to improve tensile strength and yielding strength. However, the higher elongation is obtained at 0.5V (SCE) anodic protection potential.
Badania polaryzacji potencjodyniamicznej oraz próby powolnego rozciągania (SSRT) przeprowadzono na stali typu X80 w roztworze 0,5M Na2CO3-1M NaHCO3. Określono odporność na korozję elektrochemiczną oraz zbadano zjawisko naprężeniowego pękania korozyjnego. Rezultaty badań polaryzacji potencjodynamicznej wykazały istnienie stabilnego obszaru pasywacji w zakresie potencjału od 0V do 0,8V (SCE: półogniwo odniesienia – elektroda kalomelowa). Próby powolnego rozciągania pokazały wysoką wrażliwość materiału na naprężeniowe pękanie korozyjne i ograniczenia ochrony katodowej w związku z przenikaniem wodoru. Ochrona anodowa natomiast, zwiększa znacząco wydłużenie próbki, granicę plastyczności oraz wytrzymałość na rozciąganie. Ponadto zwiększanie wartości potencjału w stabilnym obszarze pasywacji dodatkowo poprawia te właściwości.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2A; 1009-1013
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Ammonium chloride’s weakening effect on the copper activation of pyrite in flotation and the surface regulation mechanism behind it
Autorzy:
Zhang, Shengdong
Chen, Yumeng
Tong, Xiong
Xie, Xian
Lu, Yalin
Powiązania:
https://bibliotekanauki.pl/articles/110323.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
pyrite
depression
cuprammonium solution
pH buffering property
flotation
Opis:
The traditional separation process of pyrite and marmatite is carried out under highly alkaline conditions. Therefore, a large amount of lime is demanded and the zinc recovery cannot be guaranteed. However, under weakly alkaline conditions, copper-activated pyrite has good floatability, which is difficult to separate from marmatite. In this paper, ammonium chloride (NH4Cl) is used for depressing the flotation of copper-activated pyrite to achieve the separation of these two minerals under weakly alkaline environment. The flotation tests show that NH4Cl can significantly reduce the floatability of pyrite in weakly alkaline conditions. The results of adsorption tests and X-ray photoelectron spectroscopy (XPS) analyses indicate that NH4Cl can obviously change the composition of pyrite surface by increasing the content of iron/copper hydroxide and reducing the content of copper sulfides. Calculation of the solution composition demonstrates that the addition of NH4Cl results in the occurrence of Cu(NH3)n2+ and the pH buffering property. Based on these results, it can be concluded that the depression of NH4Cl on copper activated pyrite is mainly derived from two aspects: 1) the pH buffering property of the conjugated acid-base pair (NH4+/NH3) can impede the decline of OH- concentration, which results in more hydroxide adsorbed on pyrite; 2) NH3 (aq) competes with the pyrite surface to consume Cu2+through complexation, which causes a reduction in the amount of copper sulfides formed on the pyrite surface.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1070-1081
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhanced production of polygalacturonase in solid-state fermentation: selection of the process conditions, isolation and partial characterization of the enzyme
Autorzy:
Zaslona, Halina
Trusek-Holownia, Anna
Powiązania:
https://bibliotekanauki.pl/articles/1038874.pdf
Data publikacji:
2015
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
polygalacturonase
solid-state fermentation
constant pH maintaining
moisture content
phosphorus source
Penicillium chrysogenum
Opis:
Polygalacturonase (PG) production by Penicillium chrysogenum during solid-state fermentation was accompanied by decomposition of orange peels. A leaching procedure was developed through the selection of solvent, time and intensity of stirring. A maximum PG activity was observed after 48 h peel inoculation. Further cultivation decreased the enzyme activity significantly, up to 60% of the maximum PG activity. During fermentation, a rapid acidification of the solid medium which inhibited the pectinolytic enzyme, was observed. Buffering agents with different pH values and different ionic strengths were examined to identify the most suitable medium to avoid this problem. Buffer addition counteracted acidification and enhanced active protein production, which was observed for all of the applied pH values (6.5-8.0) of the buffering agent. The most satisfactory results were obtained when using the highest pH at 8.0. The protein content and PG activity increased from 3.5 mg/g and 1.09 U/g to 7.7 mg/g and 7.11 U/g during cultivation, with uncontrolled and pH-controlled medium, respectively. Measurements at wide pH and temperature ranges indicated an optimum for PG activity at pH 5.0 and 43°C; however, high thermal stability corresponded to lower temperatures, and a temperature of 37°C is thus recommended. Under these conditions, the operational stability was determined to be t1/2=570 h.
Źródło:
Acta Biochimica Polonica; 2015, 62, 4; 651-657
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of pH and stabilization time on apparent viscosity of aqueous dispersion of wholemeal barley flour
Autorzy:
Zarzycki, P.
Wirkijowska, A.
Sobota, A.
Sykut-Domanska, E.
Powiązania:
https://bibliotekanauki.pl/articles/2083676.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Instytut Agrofizyki PAN
Tematy:
apparent viscosity
barley
dietary fibre
pH
(1→3)
(1→4)–β–D glucans
INTRODUCTION
Opis:
The effect of stabilization time (0.5-3 h), pH (1.5-12), and shear rate (200-1200 s–1) on the apparent viscosity of the aqueous dispersion of wholemeal barley flour was determined. Six barley flours with different (1→3), (1→4)β–D–glucan contents were used in this study. The results revealed the significant effect of pH on apparent viscosity, but no unidirectional relationships were observed. The highest values of apparent viscosity were obtained at the highest pH (pH 12). An increase in the apparent viscosity of the barley flour dispersion with the passage of time was observed. A significant linear correlation between the apparent viscosity of aqueous dispersions of wholemeal barley flour and the content of (1→3), (1→4)–β–D glucans in wholemeal barley flour was found. These results suggest that measurements of apparent viscosity may be used to rapidly estimate (1→3), (1→4)–β–D glucan content in barley wholemeal flour. The content of (1→3), (1→4)–β–D glucans may be determined with an accuracy of 87% by the apparent viscosity of the barley flour dispersion (R2 = 0.87) with the following measurement conditions: 10% w/w wholemeal barley flour water dispersions, shear rate 1200 s–1, pH 12, 1.5-2 h time stabilization.
Źródło:
Acta Agrophysica; 2019, 26, 2; 19-28
1234-4125
Pojawia się w:
Acta Agrophysica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The organic matter content and pH of forest soils in the Brodnica Forest Division
Autorzy:
Załuszniewska, Aleksandra
Bieniek, Arkadiusz
Nogalska, Anna
Powiązania:
https://bibliotekanauki.pl/articles/2148087.pdf
Data publikacji:
2020-12-30
Wydawca:
Instytut Uprawy Nawożenia i Gleboznawstwa – Państwowy Instytut Badawczy
Tematy:
soil
pH
organic matter
tree species
Opis:
The study was conducted in the Górzno and Czarny Bryńsk Forest, ranges which belong to the Brodnica Forest Dis-trict. Brunic Arenosol (Dystric) soils predominate in the Brodnica Forest Division (over 77% of the total area). The aim of this study was to analyze the granulometric composition, the organic matter content and pH values in H2O and KCl at three genetic horizons of soils (A – humus, B – sideric and C – parent material) within the crown extension of four tree species: English oak, European beech, Scots pine and Norway spruce. Silt and clay had a signifi-cantly higher share of A-horizon compared with B and C hori-zons. Soil samples collected under the crowns of Norway spruces were characterized by a significantly higher percentage of sand and a significantly lower percentage of silt than soil samples col-lected under beech and pine trees. In the analyzed soil horizons, pH values increased significantly with depth regardless of tree species. Tree species had a significant effect on the pH of the analyzed soils and the organic matter content of A horizon. Soil samples collected under the crowns of Norway spruces had sig-nificantly lower pH values than those collected under pine trees. Soil samples collected under the crowns of Norway spruces had significantly higher organic matter content than those collected under oak trees. There was a very high negative correlation be-tween organic matter content and the values of pH measured in 1 M KCl, and a high negative correlation between organic matter content and the values of pH measured in H2O suspension.
Źródło:
Polish Journal of Agronomy; 2020, 43; 70-75
2081-2787
Pojawia się w:
Polish Journal of Agronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis And Characterization Of SiO2, SnO2 And TiO2 Metal Oxide Shells Covering Cu2O Particles
Synteza i charakterystyka powłok tlenkowych SiO2, SnO2 i TiO2 pokrywających cząstki Cu2O
Autorzy:
Yu, R.
Yun, J.
Kim, Y.
Powiązania:
https://bibliotekanauki.pl/articles/355566.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cu2O
metal oxide coating
pH value
SiO2
TiO2
SnO2
powłoki tlenkowe
Opis:
In this work is described a means of improving the chemical stability of Cu2O@SiO2, Cu2O@SnO2 and Cu2O@TiO2 materials. The SiO2, SnO2 and TiO2 coated samples were stable from pH 3 to pH 10 for up to seven days. To determine the stability of the coated nanoparticles, and their colloidal solutions under acidic and basic conditions, colloidal nanoparticle solutions with various pH values were prepared and monitored over time. Details of the effect of variations in pH on the phase stability of core-shell type Cu2O were characterized using transmission electron microscopy and X-ray diffraction.
Źródło:
Archives of Metallurgy and Materials; 2015, 60, 2B; 1159-1163
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Eliminating the adverse effect of the lime on the gold-bearing pyrrhotite flotation using the isopentyl xanthate as collector at low alkalinity
Autorzy:
Yang, Wei
Wang, Qian
Wang, Yaping
Dong, Ping
Powiązania:
https://bibliotekanauki.pl/articles/110148.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
pyrrhotite
flotation
pH regulator
collector
Opis:
Flotation optimal conditions and mechanism of regulator lime, isopentyl xanthate and butyl xanthate on pyrrhotite were investigated by flotation test, contact angle, zeta potential and infrared spectroscopic analysis. It is found that there is a certain relationship between the regulator lime and the collector isopentyl xanthate. The results of flotation indicate that lime can indeed inhibit pyrrhotite, and isopentyl xanthate can decrease the depression effect of lime on pyrrhotite in low alkalinity. The results of adsorption mechanism of lime and isopentyl xanthate show that after lime adsorbed on the pyrrhotite surface, Ca 2+inhibit the adsorption of collector with the form of Ca(OH) 2 precipitates. Compared with butyl xanthate, isopentyl xanthate could reduce the generation of hydrophilic Ca(OH) 2 and generate less hydrophilic CaCO3 as well to decrease the negative effect of gold-bearing pyrrhotite flotation depressed by lime.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1250-1258
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stimuli responsive polymeric nanoparticles in regulated drug delivery for cancer
Autorzy:
Yadav, D.
Suri, S.
Chaudhary, A.A.
-, Hemant
Beg, M. N.
Asif, M.
Ahmad, A.
Powiązania:
https://bibliotekanauki.pl/articles/949497.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
regulowane podawane leków
regulowanie temperatury
regulowanie pH
micele polimerowe
rak
regulated drug delivery
temperature and pH sensitive nanoparticles
polymeric Micelles
cancer
Opis:
Stimuli-responsive drug delivery system is a concept in which a drug is delivered at a suitable rate in response to stimuli. States of diseases may cause an alteration in some parameters of the body (e.g. in tumors) and the onset and offset of the drug delivery can be done by using this as a stimuli or a "trigger". Stimuli-responsive ("intellectual" or "sharp") resources and molecules show abrupt property changes in response to miniature changes in external stimuli such as pH, temperature etc. For regulated drug delivery, environmental stimuli such as pH and temperature, which undertake phase transition in polymer system, have been investigated. Thermally-responsive polymers can be tuned to a preferred temperature variety by copolymerization with a hydrophilic co-monomer or a hydrophobic co-monomer. Hydrophilic co-monomers increase the LCST while hydrophobic co-monomers decrease the LCST. The stimuli responsive polymer for regulated drug delivery can contain a polymer and copolymers having equilibrium of hydrophilic and hydrophobic groups. A number of these polymers have been investigated extensively and some success in drug delivery with them has been achieved, such as polymers and copolymers of N-isopropylacrylamide, PLGA, and PLA, HEMA etc. Thus this review is designed for stimuli pH and temperature responsive polymeric nanoparticles, which would be helpful to treat various cronic diseases such as cancer and others, for scientists in the field of the regulated drug delivery system.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 1; 57-64
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 376

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies