KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/123456789/1

Browse

Search Results

Now showing 1 - 10 of 35

Some of the metrics are blocked by your
consent settings
Upcycling waste mycelium into chitosan-based biodegradable triboelectric nanogenerators with enhanced energy output
(2026-12-01)
Panpho, Phakakorn
;
Charoonsuk, Thitirat
;
Pakawanit, Phakkhananan
;
Bongkarn, Theerachai
;
Vitayakorn, Narathip
Sustainable nanogenerators require bio-based active layers that combine interfacial polarization, mechanical deformability, and stable charge generation. Herein, waste mushroom mycelium (WMM) was upcycled as a multifunctional biofiller in chitosan (CTS)-based films for piezoelectric/triboelectric energy-harvesting devices. By controlling WMM loading and glycerol plasticization, this study reveals a morphology–dielectric–compliance coupling mechanism governing device performance. FTIR, XRD, SEM, and X-ray tomographic analyses show that WMM modifies hydrogen bonding, chain packing, surface texture, and internal filler connectivity, while excessive loading causes aggregation and structural non-uniformity. The optimized 7 wt% WMM/CTS film produced a PENG-mode output of 1.87 V and 1.72 μA and a TENG output of 15.39 V and 2.54 μA. The output of the TENG was further improved to 20.35 V and 2.80 μA at a maximum power of about 44 μW with glycerol plasticization. Capacitor charging, cyclic operation, LED array illumination and seven-segment display were also shown with the optimized device. Notably, the highest low-frequency apparent permittivity was observed at 11 wt% WMM/CTS, but its output decreased because of aggregation, dielectric loss, and mechanical non-uniformity. These results demonstrate that optimum energy harvesting is governed not by dielectric permittivity alone but by balanced polar interfaces, surface asperity, moderate dielectric loss, and contact compliance. This work establishes waste mycelium as a functional biofiller for sustainable biopolymer active layers in low-power self-powered systems.
Some of the metrics are blocked by your
consent settings
Development of Bilayer Chitosan–Carrageenan Hydrogel Film for Enhanced Controlled Release of Turmeric–β-Cyclodextrin Complex in Wound Dressings
(2025-11-01)
Monvisade, Pathavuth
;
Sintoppun, Tanaporn
;
Chantaranara, Prapassorn
;
Punpairoj, Prapaporn
;
Deatvakkanee, Pitchapa
This study presents the development and evaluation of a bilayer hydrogel film designed for controlled drug delivery in wound dressing applications. The outer layer, composed of chitosan and glycerol, exhibited excellent water resistance, flexibility, and favorable moisture-handling properties, including high water vapor permeability and moisture absorption, which are critical factors for maintaining an optimal wound environment. The inner drug-loaded layer, formulated with carrageenan and loaded with either free turmeric or turmeric–β-cyclodextrin inclusion complex (TCD), served as the drug reservoir. Films incorporating TCD exhibited significantly enhanced turmeric solubility and drug release efficiency compared to those containing uncomplexed turmeric. Among the tested formulations, CS-TCD1, which featured a thinner drug-loaded layer, achieved the highest performance, with approximately 68% cumulative release over four days. While the release kinetics showed a strong correlation with the Higuchi kinetic model (R2 = 0.9927), further analysis using the Akaike Information Criterion (AIC) and the Korsmeyer–Peppas model indicated an anomalous (non-Fickian) transport mechanism, governed by both diffusion and matrix swelling or erosion. These results highlight the importance of matrix architecture and drug solubilization strategies in the design of hydrogel-based drug delivery systems for wound care.
Some of the metrics are blocked by your
consent settings
A combination of coating and modified atmosphere packaging preserves the color and phytochemicals of ripe frozen mango slices
(2025-04-01)
Saikaew, Kawinchaya
;
Siripornadulsil, Wilailak
;
Siripornadulsil, Surasak
A combination of coating pretreatment and modified atmosphere packaging (MAP) was studied for preserving frozen ripe mango slices. MAP treatment with O<inf>2</inf> concentrations of 0.96–3.23 % effectively maintained mango slice color, while the CaCl<inf>2</inf> coating (CA) yielded mangoes with the highest L* value. Mahachanok ripe mango contains quinic acid, gallic acid, and coumaric acid derivatives, among which trigonelline and di- and tripeptides are the main alkaloids and other nitrogen-containing compounds, whereas tymazoline and β-carotene are the dominant terpenoids and carotenoids found in the sample. Coating and MAP treatment slightly affected the phytochemical profile of the mango slices after six months of frozen storage because the major compounds were present in both the control and CA+Mix samples (CaCl<inf>2</inf> coating followed by treatment with a mixed CaCl<inf>2</inf> and chitosan solution). Moreover, phenolic acids, flavonoids, and tannins, identified by m/z values in the range of 105–419, were lost during storage, possibly due to ice crystals. This study demonstrated that coating by the CA or CA+Mix method combined with MAP improved the color and phytochemical content (quinic acid, gallic acid, tymazoline, and trigonelline) in ripe mango slices subjected to conventional freezing; thus, this technology could be applied to reduce costs in commercial applications.
Some of the metrics are blocked by your
consent settings
Study on chemical structure stability and properties of chitosan-incorporated tamarind seed kernel xyloglucan hydrogels
(2024-12-05)
Manamoongmongkol, Kanjana
;
Sriprom, Pongsert
;
Narkrugsa, Woatthichai
;
Phumjan, Lamphung
;
Permana, Lasuardi
This study investigated the stability of chitosan-incorporated tamarind seed kernel xyloglucan hydrogels prepared at different ratios after storage for three years. The physical hydrogel samples were studied using ratios of xyloglucan to chitosan between 1.5:1 and 4:1, comparing fresh hydrogel with hydrogel stored for three years. The hydrogels were analyzed for Fourier transform infrared characteristics, rheological behavior, flow rate, and zeta potential. After three years of storage, a reversible reaction was confirmed by C-H molecular stretching using Fourier transform infrared. All hydrogel samples exhibited pseudoplastic fluid characteristics with liquid-like behavior. The zeta potential of fresh hydrogel at 1.5:1 and 4:1 ratios was 27.700 ± 0.964 mV and 22.633 ± 0.929 mV, respectively, whereas after three years, it became 28.067 ± 1.106 mV and 18.867 ± 0.503 mV, respectively. The amount of xyloglucan significantly affected the zeta potential of the xyloglucan-chitosan hydrogel, leading to a decrease in the stability of the hydrogel at a 4:1 ratio. The stability of the hydrogel at a ratio of 1.5:1 was confirmed by pH and zeta potential measurements. In conclusion, the properties and behavior of the xyloglucan-chitosan hydrogel remained stable after three years of storage at a 1.5:1 ratio.
Some of the metrics are blocked by your
consent settings
Acidic dynamics: Unveiling mechanistic insights for improved performance in chitosan triboelectric nanogenerators
(2024-07-01)
Charoonsuk, Thitirat
;
Ukasi, Sirinya
;
Mokthaisong, Panadta
;
Khuntakaew, Pawita
;
Hajra, Sugato
In recent years, there has been a surge in interest surrounding the development of chitosan (CS)-based triboelectric nanogenerators (TENG) for powering attachable/portable devices. Despite numerous strategies aimed at enhancing their efficiency, the selection of acid solvent has remained largely unexplored. In this study, various acids, including acetic (CH<inf>3</inf>COOH), succinic (C<inf>4</inf>H<inf>6</inf>O<inf>4</inf>), and citric (C<inf>6</inf>H<inf>8</inf>O<inf>7</inf>) acids, were investigated for their impact on mechanical and electrical output signals. Remarkably, the choice and concentration of acid were found to significantly influence performance. Specifically, employing citric acid rendered the CS solid film more pliable and yielded the highest output signal at optimal concentration levels. Under optimized conditions, the CS-TENG exhibited an open-circuit voltage output (V<inf>OC</inf>) of 157 V and short-circuit current output (I<inf>SC</inf>) of 53 µA—more than triple that of pristine CS-TENG. Mechanistic insights into electrical generation have been elucidated, underscoring the importance of solvent selection in CS TENG fabrication. These findings underscore the potential for tailored acid solvent selection to advance specialized applications in the field.
Some of the metrics are blocked by your
consent settings
Effects of NaOH/urea solution as a solvent and salt crystals as a porogen on the fabrication of porous composite scaffold of bacterial cellulose-chitosan for tissue engineering
(2024-03-01)
Yodsanga, S.
;
Poeaim, S.
A bacterial cellulose-chitosan composite scaffold fabricated through solvent casting-particular leaching method using NaOH/urea solution as a solvent and salt crystals as a porogen revealed a three-dimensional structure with the high porosity investigated by scanning electron microscope. The average porous size of the composite scaffold was between 300 and 500 um. The composite scaffold exhibited high water uptake, indicating to enhance water absorption capacity. The compressive test showed that the composite scaffold had good mechanical strength. Fourier-transform infrared spectroscopy analysis confirmed that bacterial cellulose and chitosan were found to be the main components of the composite scaffold. These results indicated that bacterial cellulose-chitosan composite scaffold could be used for application in tissue engineering.
Some of the metrics are blocked by your
consent settings
Assessment of the Utility of Chitosan in Drug Delivery of Sulfamethoxazole
(2024-01-01)
Soontorntepwarakul, Nussara
;
Boonyarattanakalin, Kanokthip
;
Srirussamee, Kasama
;
Paul Gleeson, M.
The objective of this research was to develop chitosan (CS) nanoparticles (NP) and microfibres (MF) for oral delivery applications related to low solubility drugs. The ionic gelation method in conjunction with freeze-drying was used to produce crosslinked chitosan material. Dynamic light scattering (DLS) was used to characterize particle size and polydispersity index (PDI). Surface morphology was analyzed using scanning electron microscopy (SEM). The antibiotic drug sulfamethoxazole (SMO) was loaded onto the chitosan nano/micro material. The degree of loading, loading efficiency and the release kinetics were investigated using high-performance liquid chromatography (HPLC) and UV-visible spectrophotometry, respectively. We found that CS nanoparticles have the potential to improve the delivery properties of SMO due to their more rapid release compared to microfibres or traditional tablet formulations.
Some of the metrics are blocked by your
consent settings
Gamma glycine enhances efficiency of organic hybrid piezoelectric-triboelectric nanogenerators
(2024-01-01)
Ukasi, Sirinya
;
Jutapukti, Paritta
;
Ninthub, Chiranicha
;
Pinpru, Nattapong
;
Pakawanit, Phakkhananan
This study presents a comprehensive exploration of enhancing the electrical output of flexible hybrid piezoelectric-triboelectric nanogenerators (P-TENG) through the incorporation of γ-glycine (γ-GC) into fully organic γ-GC/chitosan (CS) composites. A systematic investigation of the effects of γ-GC content (wt%) on the material characteristics and resulting electrical output signal is conducted. The research demonstrates the pivotal role of optimized γ-GC and CS concentrations in achieving superior performance. Through adherence to the percolation threshold principle, a critical γ-GC content is identified, leading to the attainment of the highest output signal. Three theoretical explanations substantiate this observation: firstly, molecular polarization occurring at the interface; secondly, the establishment of a well-connected filler internetwork; and thirdly, mitigation of air breakdown limitations. The interaction of γ-GC and CS fosters a robust hydrogen bond network, aligning interface polarization coherently. Efficient internetwork connections between γ-GC fillers facilitate facile charge generation and transfer. Furthermore, utilizing an appropriate quantity of γ-GC ensures optimal charge entrapment while circumventing issues related to air breakdown. The optimal electrical output is achieved by using 50% γ-GC, resulting in an open-circuit voltage (V<inf>OC</inf>) of 79 V and a short-circuit current (I<inf>SC</inf>) of 64 µA. The maximum power output (P<inf>max</inf>) registers at 705.96 µW under an external load resistance of 1 MΩ. Importantly, practical applications are demonstrated, including capacitor charging (0.22 μF and 0.33 μF), illumination of 100 LEDs, and operation of a scientific calculator-equipped watch.
Some of the metrics are blocked by your
consent settings
Characterization and Self-Cleaning Properties of Silk Fabric Coated by Chitosan-Xyloglucan/nano-TiO2 Composite Film
(2024-01-01)
Lampang, Chaiyawat Na
;
Sriprom, Pongsert
;
Manamoongmongkol, Kanjana
;
Assawasaengrat, Pornsawan
;
Narkrugsa, Woatthichai
In this study, Chitosan-Xyloglucan encapsulated Titanium dioxide was prepared by in-situ method for coating Silk fabric. FT-IR XRD characterized the functional groups and formation of crystallization of composite film. SEM analysis showed the immobilization of composite film on the surface of silk fabric. The coated silk fabrics were stained with methylene blue, and the stain removal efficiency was evaluated. The results showed that the composite film was deposited onto the silk fabric. The functional groups showed peaks around 1635 to 1636 and 400 to 500 cm-1 that indicate the presence of C=N groups of Chitosan-Xyloglucan and Ti-O groups of TiO<inf>2</inf> on the composite, respectively. The XRD results indicated that the TiO<inf>2</inf> prepared by the sol-gel method was an anatase crystalline structure. The mechanical properties showed the composite film was superior to the Chitosan-Xyloglucan, TiO<inf>2</inf>, and uncoated silk fabric. Finally, the methylene blue degradation capability was investigated. The coated silk fabric has insignificantly removing methylene blue stain than the untreated silk fabric, but it is noticeably repellent to stain.
Some of the metrics are blocked by your
consent settings
Facile Preparation of Montmorillonite/Crosslinked Chitosan Containing Potassium Nitrate Nanocomposites as Eco-Friendly Slow Release Fertilizers
(2023-08-01)
Rukchonlatee, Suparat
;
Siriphannon, Punnama
Montmorillonite/tripolyphosphate crosslinked chitosan containing potassium nitrate nanocomposites (MMT/CS-KNO3-TPP) were synthesized by facile incipient wetness impregnation method. The MMT was impregnated stepwise with a mixture of protonated chitosan and KNO<inf>3</inf>, followed by a TPP solution to ionically crosslink with chitosan, resulting in MMT/CS-KNO3-TPP nanocomposites. The initial quantity of KNO<inf>3</inf> to MMT was varied from 0 to 10, 20, and 30 wt%, and the TPP crosslinker was varied according to TPP:chitosan weight ratios of 0:5, 1:5, and 3:5. The resultant MMT/CS-KNO3-TPP nanocomposites composed of the K+ and NO<inf>3</inf>− ions embedded in crosslinked chitosan which intercalated in the MMT basal spacing and covered on MMT external surface. The structure of these nanocomposites could effectively slow the K+ and NO<inf>3</inf>− releases, with the 72- hours cumulative released values (%R) ranging from 20–34% for K+ to 0.4–1.0% for NO<inf>3</inf>−. The MMT/CS-KNO3-TPP nanocomposites with higher TPP concentration could extend the K+ and NO<inf>3</inf>− release times. Total K+ release times were predicted to be in the range of 128–204 days. The presence of MMT/CS-KNO3-TPP nanocomposites in RD43 rice cultivation could promote the growth of RD43 seedlings and roots. Furthermore, the TPP crosslinked chitosan showed physical changes in distilled water, indicating its potential as a long-term nitrogen (N) and phosphorus (P) source for plant nutrients.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results