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Aggregation of Laser-Generated Gold Nanoparticles Mediated by Formalin
Alauddin, Md.,Kim, Kuk Ki,Roy, Madhusudan,Song, Jae Kyu,Kim, Myung Soo,Park, Seung Min Korean Chemical Society 2013 Bulletin of the Korean Chemical Society Vol.34 No.1
We have investigated the effects of formalin on the assembly of colloidal gold nanoparticles (AuNPs) prepared by laser ablation of a solid gold target in deionized water. Upon addition of formalin, the surface plasmon resonance (SPR) band at 519 nm for pure AuNPs decreases and shifts to red while a new broad SPR band appears at ~700 nm. The red-shift is prominent with increase in the incubation time. The average size of the initial AuNPs is around 12 nm but it increases to 23 nm after addition of formalin. It turns out that formalin acts as a cationic surfactant for AuNPs with negative surface charge in the colloidal solutions. Furthermore, through analysis of the Raman spectrum of formalin and the density functional theory calculations, we confirm that methanediol is the main species in formalin which is in charge of the aggregation of AuNPs.
Laser Ablation of a ZnO:P2O5 Target under the Presence of a Transverse Magnetic Field
Md. Alauddin,Jin Jae Park,Doc Yong Gwak,송재규,박승민 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.4
From time-resolved optical emission spectra, we have investigated the effects of a transverse magnetic field on the expansion of a plasma plume produced by laser ablation of a ZnO:P₂O5 ceramic target in oxygen active atmosphere. The emission spectra of Zn+*, P+*, and Zn* neutrals in the presence of magnetic field turn out to be considerably different from those without magnetic field. The characteristics of the deposited films grown on amorphous fused silica substrates by pulsed laser deposition (PLD) are examined by analyzing their photoluminescence (PL), X-ray diffraction (XRD), and UV-visible spectra.
The branching ratio in the infrared predissociation of aniline-water-methanol<sup>+</sup> ion
Alauddin, Md.,Song, J.K.,Park, S.M. North Holland ; Elsevier Science Ltd 2010 Chemical physics letters Vol.498 No.1
The infrared (IR) photodissociation of aniline-water-methanol cluster ion was investigated in the 2600-3900cm<SUP>-1</SUP> region to examine the factors which play key roles in determining the branching ratio of a concurrent predissociation reaction. The dominant channel in the IR predissociation of AWM<SUP>+</SUP> (A: aniline, W: water, M: methanol) was AWM<SUP>+</SUP>->AM<SUP>+</SUP> at all vibrational modes although the calculated binding energies of water and methanol were nearly the same. Also, the branching ratio was slightly dependent on the specific excited mode, ranging from 0.036 to 0.074; the most effective mode to kick out methanol was OH vibration of methanol.
Aggregation of Laser-Generated Gold Nanoparticles Mediated by Formalin
Md. Alauddin,Kuk Ki Kim,Madhusudan Roy,송재규,김명수,박승민 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.1
We have investigated the effects of formalin on the assembly of colloidal gold nanoparticles (AuNPs) prepared by laser ablation of a solid gold target in deionized water. Upon addition of formalin, the surface plasmon resonance (SPR) band at 519 nm for pure AuNPs decreases and shifts to red while a new broad SPR band appears at ~700 nm. The red-shift is prominent with increase in the incubation time. The average size of the initial AuNPs is around 12 nm but it increases to 23 nm after addition of formalin. It turns out that formalin acts as a cationic surfactant for AuNPs with negative surface charge in the colloidal solutions. Furthermore, through analysis of the Raman spectrum of formalin and the density functional theory calculations, we confirm that methanediol is the main species in formalin which is in charge of the aggregation of AuNPs.
Alauddin, Md.,Park, Jin-Jae,Gwak, Doc-Yong,Song, Jae-Kyu,Park, Seung-Min Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.4
From time-resolved optical emission spectra, we have investigated the effects of a transverse magnetic field on the expansion of a plasma plume produced by laser ablation of a ZnO:$P_2O_5$ ceramic target in oxygen active atmosphere. The emission spectra of $Zn^{+*}$, $P^{+*}$, and $Zn^*$ neutrals in the presence of magnetic field turn out to be considerably different from those without magnetic field. The characteristics of the deposited films grown on amorphous fused silica substrates by pulsed laser deposition (PLD) are examined by analyzing their photoluminescence (PL), X-ray diffraction (XRD), and UV-visible spectra.
Infrared predissociation of ternary cluster cations: the solvent effects on the branching ratio
Alauddin, Md.,Song, Jae Kyu,Choe, Joong Chul,Park, Seung Min The Royal Society of Chemistry 2012 Physical chemistry chemical physics Vol.14 No.11
<P>Infrared (IR) predissociation of hydrogen-bonded ternary cluster ions such as aniline–water–ethanol (AWE<SUP>+</SUP>), aniline–water–isopropanol (AWP<SUP>+</SUP>), aniline–methanol–ethanol (AME<SUP>+</SUP>), aniline–water–pyrrole (AWPy<SUP>+</SUP>), and aniline–water–benzene (AWB<SUP>+</SUP>) was examined in the region of 2700–4000 cm<SUP>−1</SUP> to explore the key factors which determine the branching ratios in the concurrent unimolecular dissociation. The smaller solvent molecule was predominantly ejected when the binding energies of the two were not too different. On the other hand, when they were far off, the binding energy also acted significantly on the branching ratio. Besides, mode-selective IR predissociation was observed, while the selectivity was not quite distinct. The IR predissociation of ternary cluster ions bound <I>via</I> hydrogen bonding is considered to occur on a time scale much faster than intramolecular vibrational energy redistribution, which was proved by a statistical transition state theory.</P> <P>Graphic Abstract</P><P>The sizes of solvent molecules as well as their binding energies play a certain role in the infrared predissociation of ternary cluster ions. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cp23924h'> </P>
The Impact of Loyalty Program on Customer Retention: Empirical Evidence from Bangladesh
AHSAN, Syed Md. Hasib,ALAUDDIN, Md.,ALAM, Mohammad Manjur,NAZIA, Adiba,ISLAM, Tasnim Korea Distribution Science Association 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.6
The purpose of this paper is to examine how loyalty programs designed by retail stores affect customer retention. The present study is one of the few empirical studies finding the role of different loyalty programs that help to build customer retention. The study also seeks to explore the moderation role of customer perceived value between intrinsic motivation - customer retention and extrinsic motivation - customer retention. The researchers employed a quantitative research design to collect data from the 350 respondents who purchased goods from the retail chain/departmental stores in Bangladesh. The collected data are then analyzed using structural equation modeling. The result of their findings indicated that the size of the organizational reward has a positive effect on intrinsic and extrinsic motivation; further extrinsic motivation has a significant relation to customer retention. Surprisingly, no support was found for the positive impact of intrinsic motivation on customer retention. Customer perceived value (CPV) is critical as a moderator in building client retention, which improves the positive association between extrinsic motivation and customer retention. CPV, on the other hand, was found to mitigate the negative link between intrinsic motivation and client retention.
Mohammad Manjur ALAM,Md. ALAUDDIN,Mohd Yasin SHARIF,Evana Nusrat DOOTY,Syed Md. Hasib AHSAN,Mustafa Manir CHOWDHURY 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.9
Educational institutions play a critical role in national development through the advancement of skilled human resources and intellectual society. The number of higher educational institutions (HEIs) is increasing significantly in Bangladesh. Students have a number of options from which to select their preferred educational institutions. Hence, HEIs should think about the quality of services they provide to students. The objective of this study is to measure students’ satisfaction and university reputation through service quality (SQ) in a private higher educational institution (PriHEI) in Bangladesh. Primary data was collected from 270 students of International Islamic University Chittagong (IIUC), Bangladesh, through a simple random sampling technique. In this study, data was analyzed through descriptive statistics, correlation, measurement model using confirmatory factor analyses, and structural equation modeling (SEM). The results showed that transport services have indirect but medical and physical facilities have both direct and indirect significant effects on overall students’ satisfaction. Further, the administrative services and research facilities have significant indirect effects on overall students’ satisfaction. Finally, the results of structural equation modeling (SEM) confirm that the reputation of the university is directly associated with overall students’ satisfaction.
Roy, Madhusudan,Kim, Kuk Ki,Alauddin, Md.,Song, Jae Kyu,Park, Seung Min Elsevier 2015 INTERNATIONAL JOURNAL OF MASS SPECTROMETRY Vol.379 No.-
<P><B>Abstract</B></P> <P>Vibrational predissociation spectra of aniline(pyrrole)(water)<SUB>2</SUB> <SUP>+</SUP> and aniline(pyrrole)(water)<SUB>3</SUB> <SUP>+</SUP> clusters were taken at 2700–4000cm<SUP>−1</SUP> to verify their most stable structures. One NH of aniline was bonded to the π electron of pyrrole while the other NH was bonded to water. Pyrrole molecule was arranged in such a way that NH of pyrrole formed another hydrogen bond with a water molecule nearby. Water molecule was more easily ejected than pyrrole for both AnPyW<SUB>2</SUB> <SUP>+</SUP> and AnPyW<SUB>3</SUB> <SUP>+</SUP> although pyrrole had smaller binding energy than water.</P> <P><B>Highlights</B></P> <P> <UL> <LI> IR predissociation spectra of aniline(pyrrole)(water)<SUB>2</SUB> <SUP>+</SUP> and aniline(pyrrole)(water)<SUB>3</SUB> <SUP>+</SUP> were obtained. </LI> <LI> The most stable cluster structures were suggested along with DFT calculations. </LI> <LI> Water molecule was dominantly ejected by IR absorption. </LI> </UL> </P>