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The Middle Lamella Remainders on the Surface of Various Mechanical Pulp Fibres
KECHENG LI,XUEQUAN TAN,DONGBO YAN 한국펄프·종이공학회 2006 한국펄프종이학회 기타 간행물 Vol.- No.-
The surface of various mechanical pulp fibres including thermomechanical pulp (TMP), chemithermomechanical pulp (CTMP), and alkaline peroxide mechanical pulp (APMP) fibres, were characterized using SEM, AFM, and XPS. With SEM and AFM, middle lamella material was observed to be non-fibrillar, patch-like, while fibre secondary wall was observed to have a microfibrillar structure. It was found that after the first-stage refiner, lignin-rich middle lamella remainders are present on the fibre surface of all three pulps, although most of the fibre surfaces expose microfibrillar structure. After the final-stage refining, large amounts of granules are present on the TMP fibre surface. In contrast, most middle lamella remainders remain on the surface of CTMP fibres after final stage refining and even after peroxide bleaching. XPS results have confirmed that the non-fibrillar surface material is the lignin-rich middle lamella remainder., and the remainders of middle lamella contribute to the high surface lignin concentration.
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MOF-Derived Porous CeO2-x/C Nanorods and their Applications in Uric Acid Biosensor
Jinbao Luo,Jiewu Cui,Yan Wang,Dongbo Yu,Yongqiang Qin,Hongmei Zheng,Yu Hong,Yong Zhang,Yucheng Wu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.7
Selectivity is significant to the practical applications of electrochemical biosensors in clinical and diagnostic field. In this paper, porous CeO2-x/C nanorods (NRs) derived from Ce-based metal organic framework (MOF) were synthesized and employed as substrate to construct uric acid biosensors with high sensitivity and selectivity at low working potential. The morphology, microstructures and elemental states of as-prepared samples were investigated by SEM, XRD, TEM and XPS systematically. It was found that a great amount of oxygen vacancies was introduced into the interstitial of CeO2 and nonstoichiometric CeO2/C (CeO2-x/C) nanorods based on Ce-MOF were formed under calcination in Ar atmosphere. The increased oxygen vacancies enabled the negatively shifting of the working potential towards H2O2 detection for CeO2-x/C nanorods, favoring the construction of biosensors based on the detection of H2O2. Uric biosensors based on CeO2-x/C NRs exhibited a high sensitivity of 220.0 μA · cm -2 · mM -1 and a linear range from 50 μM to 1000 μM at working potential of -0.4 V versus SCE. It also exhibited superior selectivity toward interferents coexisting with uric acid in urine due to the low working potential.
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A High-Performance Self-Powered UV Photodetector Based on SnO2 Mesoporous Spheres @ TiO2
Yuewu Huang,Qingjiang Yu,Jinzhong Wang,Xiaochao Li,Yuan Yan,Shiyong Gao,Feifei Shi,Dongbo Wang,Cuiling Yu 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.6
A novel self-powered UV photodetector (UVPD) based on the photoelectrochemical cell (PECC) has been constructed using the TiO2 coated SnO2 mesoporous spheres (SnO2-MS@TiO2). This self-powered UVPD displays a higher photocurrent density compared to the UVPD with the pure SnO2-MS. By means of external quantum efficiency (EQE), UV-vis absorption, and electrochemical impedance measurements, we scrutinize the intrinsic role of the TiO2 coating layer on the photocurrent enhancement. Under UV irradiation, this UVPD exhibits a high on/off ratio of 11519, a fast rise time of 0.007 s and decay time of 0.006 s, together with the excellent visible-blind characteristic and linear optical signal response. The self-powered photodetector is a promising candidate for application in high-sensitivity and high-speed UVPDs.
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