http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Sulaiman Y. M. Alfaifi (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Effect of low levels of hydrotropes on micellization of phenothiazine drug
Sulaiman Y. M. Alfaifi,Dileep Kumar,Malik Abdul Rub,Farah Khan,Naved Azum,Anish Khan,Abdullah M. Asiri,Hurija Džudžević-Čančar 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.2
Interactions within mixtures of the phenothiazine drug promethazine hydrochloride (PMH) and cationic hydrotropes ortho-toluidine hydrochloride (o-TDH) and para-toluidine hydrochloride (p-TDH) were investigated at different ratios and temperatures via conductometry to understand various physicochemical properties. Critical micelle concentration (cmc) was less than values of cmcid (cmc in ideal mixed system), indicating significant interaction among the studied constituents in solution mixtures. The cmc of pure PMH was also determined by measuring the surface tension for comparison. A variety of micellization thermodynamic parameters (Gibbs free energy [Gm 0 ], change in standard enthalpy [Hm 0 ], and change in entropy [Sm 0 ]) were computed using conductometry. The micellar mole fraction (X1 Rb, X1 Rod, and X1 id) of hydrotropes estimated by various theoretical models (Rubingh, Rodenas, and Motomura) was assessed, and the results showed a greater contribution of hydrotropes in mixed micelles along with their values increasing via an increase in mole fraction (1) of hydrotropes (o-TDH/p-TDH). Negative values suggest extremely favorable attractive interaction/synergism, as declines occurred in the whole quantity of amphiphile used for the desired purpose, leading to a drop of expenditure along with ecological concern. Obtained activity coefficients (f1 and f2) were always beneath unity, meaning nonideality was found between PMH and o-TDH/p-TDH. Like the conductivity method, the UV-visible and FT-IR techniques also demonstrate the interaction between the PMH and o-TDH/p-TDH.
-
Mohammed M. Rahman,M.M. Alam,Abdullah M. Asiri,Sulaiman Y. M. Alfaifi,Hadi M. Marwani 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.106 No.-
High performance acute toxic methanol sensor based on hydrothermally prepared hexagonal nanodiscs(NDs) of ZnO/CdO/SnO2 (ZnCdSnO2 or ZCSO) was fabricated onto glassy carbon electrode (GCE). The characterizationof ZCSO NDs in-terms of functional group analysis, binding energy evaluation, oxidationstates, optical absorbance, crystallinity, structural morphology, and elemental compositions were performedby FTIR spectroscopy, X-ray photoelectron spectroscopy (XPS), UV–visible spectroscopy, XRD,FESEM-coupled-EDS analysis respectively. The current versus concentration plot was exhibited linearon a wide range of methanol concentration (0.01 nM to 0.1 mM) clarified as linear dynamic methanoldetection range (LDR). Considering the ZCSO NDs-coated surface area onto GCE over the slope of LDR,noticeable methanol sensor sensitivity (4.5475 mA mM1 cm2) was perceived. Besides this, a considerablelower limit (7.69 ± 0.38 pM) of detection at signal/noise = 3 is obtained. The overall results of methanolchemical sensor were found with satisfactory and acceptable results in terms of their reproducibility,sensitivity, stability, and response-time. Additionally, the assembled ZCSO NDs-coated electrode was validatedwith real environmental samples and result was found good and acceptable. On considering theoutcome of applicability and the way of this sensor assembling, this unique method might be a potentialtechnique in the field of portable sensor development for the safety of environmental and healthcarefields in a broad scale.
-
Mohammed M. Rahman,Jahir Ahmed,Abdullah M. Asiri,Sulaiman Y. Alfaifi 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.109 No.-
Herein, a novel composite material (Magnesium co-doped Tin (IV) oxide; MTO) microcube was synthesizedby a simple solution method in basic phase and successfully characterized. It has been used theFourier Transform Infrared Spectroscopy (FTIR), X-ray Photoelectron Spectroscopy (XPS), X-rayDiffraction (XRD), Field Emission Scanning Electron Microscope (FESEM), and Energy-DispersiveSpectroscopy (EDS) techniques for the characterization of MTO. The MTO microcube was used later tomodify gold-coated l-chips to detect unsafe toxin, bisphenol A (BPA) in aqueous medium. Notable sensingperformance was achieved with excellent sensitivity (1.63 mAmM1cm2), fast response time (11 s),wide linear dynamic range (LDR = 0.10 nM – 1.0 mM: R2 = 0.9997), ultra-low detection limit (2.7 ± 0.1 pMat S/N = 3) and excellent reproducibility and repeatability for the MTO/Au/l-Chip sensor. This MTO fabricatedgold-coated l-chip was further applied with appropriate quantification and determination resultsin real environmental sample analyses.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
