Počet záznamov: 1
Využití Ramanovy spektroskopie a jiných spektroskopických metod při hodnocení jasové reverzibility buničiny
SYS 0075453 LBL 00000naa^^22^^^^^^^^450 005 20190402085610.5 100 $a 20141027d m y0sloc0103 ba 101 0-
$a cze $d eng 102 $a SK 200 1-
$a Využití Ramanovy spektroskopie a jiných spektroskopických metod při hodnocení jasové reverzibility buničiny $d Utilization of Raman spectroscopy and other spectroscopic methods in evaluation of brightness reversion of pulp $f Tereza Tribulová, František Kačík, Dimitry Evtuguin, Iveta Čabalová 215 $c Obr., tab. 320 $a Lit. 330 $a The main objective of this work is to evaluate the effect of chemical modification on brightness reversion of bleached cellulosic pulp upon aging by using the advanced analytical techniques, such as spectrophotometry, UV–VIS Diffuse Reflectance (UV–VIS DR) spectroscopy and VIS–Resonance Raman (VIS–RR) spectroscopy (at 442 nm). The bleached sulphite pulp of 91.8 % ISO brightness was treated by different levels of seawater and then involved on accelerated wet-thermal ageing process. The results of used methods clearly showed that the chemical modification with natural solution of inorganic salts has a detrimental effect on the brightness stability of bleached pulps. Pulp cellulose suffered from oxidative depolymerization in the presence of seawater salts under conditions of combined aging. This process was accompanied by the formation of new oxidised structures containing carbonyl and carboxyl groups, which were extensively converted into chromophore structures. The oxidative depolymerization of cellulose in the presence of seawater upon aging was associated with certain seawater salts, such as alkaline carbonate salts, sulphates and transition metal cations provoking base-induced autoxidation reactions. This study provides clear evidence for the increasing of pulp brightness reversion under conditions of inorganic salts. 330 $a Cieľom príspevku je zhodnotenie vplyvu teploty, vlhkosti a chemickej modifikácie (roztokom anorganických solí v podobe morskej vody) na jasovú reverzibilitu bielnej sulfitovej buničiny pomocou neinvazivnych spektroskopických techník in-situ: spektrofotometrického stanovenia jasu, UV–VIS difúznej reflektancie (UV–VIS DR) a VIS rezonančnej Ramanovej spektroskopie (VIS–RR). 463 -1
$1 001 sldk_un_cat*0075362 $1 011 $a 1336-3824 $1 200 1 $a Acta Facultatis Xylologiae Zvolen $e vedecký časopis Drevárskej fakulty $v Roč. 56, č. 2 (2014), s. 63-72 $1 210 $a Zvolen $c Technická univerzita vo Zvolene $d 2014 610 1-
$9 sldk_un_auth*h001369 $a spektroskopia $X spectroscopy 610 1-
$9 sldk_un_auth*0036121 $a jasová reverzibilita $X brightness reversion 610 1-
$9 sldk_un_auth*h008418 $a buničina $X pulp 610 1-
$9 sldk_un_auth*0008614 $a Ramanova spektroskopia $X Raman spectroscopy 675 $a 543.42 $v 1. stred. $z slo 675 $a 543.424.2 $v 2.stred $z slo 675 $a 630*861 $v 1. stred. $z slo 700 -1
$3 sldk_un_auth*0035014 $a Tribulová $b Tereza $f 1986- $p TUZDFCHTD $4 070 $T Katedra chémie a chemických technológií 701 -1
$3 sldk_un_auth*p0015985 $a Kačík $b František $f 1958- $p TUZDFCHTD $4 070 $T Katedra chémie a chemických technológií 701 -1
$3 sldk_un_auth*0037885 $a Evtuguin $b Dmitry V. $4 070 701 -1
$3 sldk_un_auth*p0051819 $a Čabalová $b Iveta $f 1979- $p TUZDFCHTD $4 070 $T Katedra chémie a chemických technológií 801 -0
$a SK $b ZV001 $c 20141027 $g AACR2 856 4-
$u https://df.tuzvo.sk/sites/default/files/07-2-14-tribulova-kacik-evtuguin-cabalova_1.pdf
Počet záznamov: 1