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Manipulation of Surface Carboxyl Content on TEMPO-Oxidized Cellulose Fibrils
Nanang Masruchin,Byung Dae Park 한국목재공학회 2015 목재공학 Vol.43 No.5
Simple methods of conductometric titration and infrared spectroscopy were used to quantify the surface carboxyl content of cellulose fibrils isolated by 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation. The effects of different cellulose sources, post or assisted-sonication oxidation treatment, and the amount of sodium hypochlorite addition on the carboxyl content of cellulose were reported. This study showed that post sonication treatment had no influence on the improvement of surface carboxyl charge of cellulose macrofibrils (CMFs). However, the carboxyl content increased for the isolated cellulose nanofibrils (CNFs). Thus the carboxyl content of CNFs is different from those of their corresponding bulk oxidized cellulose and CMFs. Filter paper as a CNF source imparted a higher surface charge than did hardwood bleached kraft pulp (HWBKP) and microcrystalline cellulose (MCC). It was considered that the crystallinity and microstructure of the initial cellulose affected oxidation efficiency. In addition, the carboxyl content of cellulose was successfully controlled by applying sonication treatment during the oxidation reaction and adjusting the amount of sodium hypochlorite.
Nanang Masruchin,박병대,Valerio Causin 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
This study investigated effects of sonication treatment on characteristics and drug release behavior ofhydrogels prepared by supramolecular cellulose microfibrils (CMFs) isolated by 2,2,6,6-tetramethylpi-peridine-1-oxyl radical (TEMPO)-mediated oxidation which made carboxylate negative charge availableon the CMFs’ surface. The hydrogels were fabricated by inducing ionic interactions between negativelycharged CMFs and a positive metal ion (Al3+). The sonication time showed no influence on thecarboxylate content of CMFs, but it greatly influenced characteristics and drug release behavior of thehydrogels. These results indicate that the sonication time has an impact on hydrogels’ characteristics anddrug release behavior.
Rahmini,Nanang Masruchin,Soo-Jeong Shin 한국펄프·종이공학회 2024 펄프.종이기술 Vol.56 No.4
Understanding the elemental composition and distribution of inorganics in both base paper and printed ink is crucial for various applications, including paper and ink manufacturing, printing process optimization, and cultural heritage conservation. The primary objective of this study was to investigate the potential of micro-X-ray fluorescence (µ-XRF) analysis in examining inorganics and their impact on the image quality of printed materials. The research involved analyzing different base papers containing precipitated calcium carbonate and ground calcium carbonate as filler and printed ink (e.g., inkjet and offset) using µ-XRF. The elemental maps and spectra obtained from µ-XRF provided useful information about the inorganic elements present in the paper and ink layers. Image analysis techniques were employed to establish a correlation between the elemental distribution in the printed image and its visual characteristics. By focusing on key elements found in pigments, fillers, and other components, µ-XRF analysis provides valuable insights into the printing process, ink-paper interactions, and the resulting visual properties of the printed image. The study successfully differentiated between paper types based on their unique inorganic signatures, primarily by examining the magnesium content to distinguish heavy and light calcium carbonate fillers. The analysis of printed ink sections using µ-XRF revealed distinct elemental profiles for each ink type, making it possible to clearly identify inkjet and offset printing. Overall, this study suggested that µ-XRF analysis is a valuable tool for understanding the complex relationship between inorganic elements, printing methods, and image quality. Further investigation is required to examine how the quality of images is affected by the paper substrate. Additionally, investigating the combined effect of multiple elements and their interactions within the printing system can provide a more comprehensive understanding. Integrating µ-XRF with other analytical techniques can offer further insights into the complex interplay between paper, ink, and printing processes.