ORCID Profile
0000-0003-1705-0226
Current Organisation
The Hong Kong Polytechnic University
Does something not look right? The information on this page has been harvested from data sources that may not be up to date. We continue to work with information providers to improve coverage and quality. To report an issue, use the Feedback Form.
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 09-2021
Publisher: American Chemical Society (ACS)
Date: 07-11-2019
DOI: 10.1021/ACS.BIOMAC.9B01413
Abstract: Natural melanin is a ubiquitous material that plays critical biofunctional roles in different living organisms. Scientists have dedicated significant efforts to elucidate the biofunctional roles of melanin since its discovery. It has been confirmed that natural melanin possesses a number of intriguing properties such as broadband light absorption, free-radical scavenging ability, redox activity, metal ion chelating, and electronic-ionic conductivity, enabling it to be a versatile functional material in various applications. Natural eumelanin has been the most investigated type of melanin in the past few decades and is discussed in this Review. Here we have comprehensively discussed the latest advances and associated mechanisms in emerging applications of natural eumelanin in different fields such as functional polymers, energy storage, energy conversion, photocatalysis, photothermal therapy, and wastewater treatment considering its bioinspired properties. Important applications developed based on polydopamine, which is a "eumelanin-like" material, will also be presented to give guidelines to further develop natural-melanin-based applications. Authors' perspectives on the challenges and potentials of developing natural-eumelanin-based applications will also be included. This Review provides a clear picture of the natural-eumelanin-based applications and, in turn, accelerates the expansion of the relevant emerging fields.
Publisher: Elsevier BV
Date: 07-2023
Publisher: SAGE Publications
Date: 19-08-2017
Abstract: Polyacrylonitrile (PAN) fiber coated with photocatalyst titanium dioxide (P25) was successfully fabricated by a dip coating process using dimethyl sulfoxide (DMSO)/ethanol (EtOH) as co-dispersion solvent. Photocatalytic performance of P25-coated PAN fibers was evaluated by degrading a model dye rhodamine B (RhB) in aqueous solution under ultraviolet (UV) light irradiation. The preparation parameters of P25-coated PAN fibers were optimized by an orthogonal design, and were found to be a P25 concentration of 0.05 g/L, a ratio of 85/15 (v/v) DMSO/EtOH, and a take-up speed of 0.5 m/min. A possible mechanism of co-dispersion solvent dip coating was proposed based on Hansen solubility parameters’ theory. The P25-coated PAN fibers prepared at the optimum conditions had high dye removal efficiency. They also showed an excellent cycling performance for dye removal of up to 99% recovery over several cycles. The coating process has little impact on both the fiber strength and the breaking strength. The breaking strength of P25-coated PAN fibers was maintained even after several cycles. This study provides an easy-to-scale-up method for preparing P25-coated PAN fibers. The obtained P25-coated PAN fibers show great potential as a low-cost, easy handling, and recyclable photocatalyst for dye effluent treatment.
Publisher: Elsevier BV
Date: 02-2011
Publisher: Springer Science and Business Media LLC
Date: 20-07-2021
Publisher: American Chemical Society (ACS)
Date: 20-03-2019
Abstract: The concept of thermoregulating textiles capable of providing personal thermal management property (PTM) has attracted significant attention in recent years. It is considered as an emerging approach to promote the comfort and general well-being of wearers and also to mitigate the energy consumption load for indoor living space conditioning. Regulating the heat exchange between human body and environment has been the core subject of many studies on introducing the PTM functionality to textiles. This work provides an overview of the latest literature, summarizing the recent innovations and state-of-the-art approaches of controlling the heat gain and loss of textiles. To this end, methods to control the fundamental aspects of heat gain and loss of fabrics such as using near-infrared reflective materials and conductive nanomaterials, designing photonic structures of fabrics, and engineering nanoporous structures for passive cooling and heating effects will be discussed. Moreover, specific attention is given to the application of phase change materials in textiles, their integration methods, and the associated mechanisms. Several commercial methods such as adapting the innovative designs, introducing moisture management capability, and using air/liquid thermoregulating systems will also be discussed. This review article provides a clear picture of the concept of thermoregulating textiles and recommends some future research trajectories for this emerging field.
Publisher: Elsevier BV
Date: 06-2011
DOI: 10.1016/J.JPHOTOBIOL.2011.03.009
Abstract: In this study an effective nanocomposite antimicrobial agent for wool fabric was introduced. The silver loaded nano TiO(2) as a nanocomposite was prepared through UV irradiation in an ultrasonic bath. The nanocomposite was stabilized on the wool fabric surface by using citric acid as a friendly cross-linking agent. The treated wool fabrics indicated an antimicrobial activity against both Staphylococcus aureus and Escherichia coli bacteria. Increasing the concentration of Ag/TiO(2) nanocomposite led to an improvement in antibacterial activities of the treated fabrics. Also increasing the amount of citric acid improved the adsorption of Ag/TiO(2) on the wool fabric surface leading to enhance antibacterial activity. The EDS spectrum, SEM images, and XRD patterns was studied to confirm the presence of existence of nanocomposite on the fabric surface. The role of both cross-linking agent and nanocomposite concentrations on the results was investigated using response surface methodology (RSM).
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2SU00086E
Abstract: A new insight into odor adsorption onto common fibers promotes health and wellbeing through managing malodor and indoor air pollutants.
Publisher: American Chemical Society (ACS)
Date: 28-07-2020
Publisher: Elsevier BV
Date: 03-2021
Publisher: Springer Science and Business Media LLC
Date: 26-06-2017
Publisher: Springer Science and Business Media LLC
Date: 06-03-2023
Publisher: Elsevier BV
Date: 09-2022
Publisher: Wiley
Date: 12-04-2011
DOI: 10.1002/APP.33858
Publisher: Wiley
Date: 11-04-2011
DOI: 10.1002/APP.33979
Publisher: Elsevier BV
Date: 04-2022
Publisher: SAGE Publications
Date: 07-12-2014
Abstract: Numerous investigations have recently been conducted to enhance the intrinsic properties of textiles and add new functionalities to textile products. The photocatalytic features of nanoparticles, notably titanium dioxide (TiO 2 ), have played a pivotal role in this pursuit. This review article presents an overview of the use of pure as well as modified TiO 2 in textiles. In addition, some of TiO 2 modification methods, pertinent photocatalytic mechanisms and potential applications of metallic and non-metallic nanocomposites of TiO 2 in functionalizing textiles, are highlighted. Furthermore, current research accomplishments and future prospects in this field are discussed.
Publisher: Elsevier BV
Date: 02-2019
Publisher: Elsevier BV
Date: 06-2013
Publisher: Wiley
Date: 03-2010
DOI: 10.1111/J.1751-1097.2009.00680.X
Abstract: Wool is the most important animal fiber used in textile industries, but its photostability is very low. Scientists have searched for new ways to increase the photostability of wool. As TiO(2) nano particles have features suitable for new applications, the UV-blocking power of nano TiO(2) may be used for protecting fabrics against UV rays. Treatment of wool with TiO(2) can be effective for controlling photodegradation. This study focused on protecting wool fabric against UV rays using nano TiO(2). To this end, oxidized and raw wool were treated with citric acid as the cross-linking agent and different concentrations of nano TiO(2). The whiteness and yellowness of wool fabric s les were reported. XRD patterns proved the existence of TiO(2) nano-particles on the wool surface. Finally, the results revealed that nano TiO(2) is a suitable UV absorber on wool fabric and its effect depends on concentration.
Publisher: Informa UK Limited
Date: 02-01-2015
Publisher: Elsevier BV
Date: 07-2013
DOI: 10.1016/J.JCIS.2013.03.016
Abstract: This manuscript aims to investigate the functionalization of cotton fabrics with TiO2/SiO2. In this study, the sol-gel method was employed to prepare titania and silica sols and the functionalization was carried out using the dip-pad-dry-cure process. Titanium tetra isopropoxide (TTIP) and tetra ethyl orthosilicate (TEOS) were utilized as precursors of TiO2 and SiO2, respectively. TiO2/SiO2 composite sols were prepared in three different Ti:Si molar ratios of 1:0.43, 1:1, and 1:2.33. The self-cleaning property of cotton s les functionalized with TiO2/SiO2 was assessed based on the coffee stain removal capability and the decomposition rate of methylene blue under UV irradiation. FTIR study of the TiO2/SiO2 photocatalyst confirmed the existence of Si-O-Si and Ti-O-Si bonds. Scanning electron microscopy was employed to investigate the morphology of the functionalized cotton s les. The s les coated with TiO2/SiO2 showed greater ability of coffee stain removal and methylene blue degradation compared with s les functionalized with TiO2 demonstrating improved self-cleaning properties. The role of SiO2 in improving these properties is also discussed.
Publisher: Elsevier BV
Date: 09-2015
Publisher: Informa UK Limited
Date: 04-2011
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 02-2020
Publisher: Elsevier BV
Date: 10-2016
Publisher: Elsevier BV
Date: 05-2019
Publisher: Springer Science and Business Media LLC
Date: 23-03-2020
Publisher: American Chemical Society (ACS)
Date: 28-08-2020
Publisher: Elsevier BV
Date: 12-2014
Publisher: Elsevier BV
Date: 04-2020
Publisher: Elsevier BV
Date: 02-2020
Publisher: Elsevier BV
Date: 06-2015
DOI: 10.1016/J.JCIS.2015.01.076
Abstract: The surface of wool fabrics was coated with TiO2 and TiO2-based nanocomposite colloids and the impact of this coating on the photostability of wool was investigated. TiO2 along with TiO2/Metal and TiO2/Metal/SiO2 sols were synthesized through a low-temperature sol-gel method and applied to fabrics. Composite colloids were synthesized through integrating the silica and three noble metals of silver (Ag), gold (Au) and platinum (Pt) into the synthesis process of sols. Four different molar ratios of Metal to TiO2 (0.01%, 0.1%, 0.5% and 1%) were used to elucidate the role of metal type and amount on the obtained features. Photostability and UV protection features of fabrics were evaluated through measuring the photo-induced chemiluminescence (PICL), photoyellowing rate and ultraviolet protection factor (UPF) of fabrics. PICL and photoyellowing tests were carried out under UVA and UVC light sources, respectively. PICL profiles demonstrated that the presence of pure and modified TiO2 nanoparticles on fabrics reduced the intensity of PICL peak indicating a lower amount of polymer free radicals in coated wool, compared to that of pristine fabric. Moreover, a higher PICL peak intensity as well as photoyellowing rate was observed on fabrics coated with modified colloids in comparison with pure TiO2. The surface morphology of fabrics was further characterized using FESEM images.
Publisher: Springer Science and Business Media LLC
Date: 10-2010
Publisher: American Chemical Society (ACS)
Date: 03-07-2023
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 07-2022
Publisher: Elsevier BV
Date: 12-2021
Publisher: Informa UK Limited
Date: 30-07-2023
Publisher: Elsevier BV
Date: 12-2011
Publisher: Elsevier BV
Date: 10-2022
Publisher: Elsevier BV
Date: 02-2015
DOI: 10.1016/J.JCIS.2014.10.032
Abstract: The surface of wool fabrics was coated with TiO2 and TiO2-based nanocomposite colloids and the impact of this coating on the photostability of wool was investigated. TiO2 along with TiO2/Metal and TiO2/Metal/SiO2 sols were synthesized through a low-temperature sol-gel method and applied to fabrics. Composite colloids were synthesized through integrating the silica and three noble metals of silver (Ag), gold (Au) and platinum (Pt) into the synthesis process of sols. Four different molar ratios of Metal to TiO2 (0.01%, 0.1%, 0.5% and 1%) were used to elucidate the role of metal type and amount on the obtained features. Photostability and UV protection features of fabrics were evaluated through measuring the photo-induced chemiluminescence (PICL), photoyellowing rate and ultraviolet protection factor (UPF) of fabrics. PICL and photoyellowing tests were carried out under UVA and UVC light sources, respectively. PICL profiles demonstrated that the presence of pure and modified TiO2 nanoparticles on fabrics reduced the intensity of PICL peak indicating a lower amount of polymer free radicals in coated wool, compared to that of pristine fabric. Moreover, a higher PICL peak intensity as well as photoyellowing rate was observed on fabrics coated with modified colloids in comparison with pure TiO2. The surface morphology of fabrics was further characterized using FESEM images.
Location: No location found
Location: Australia
No related grants have been discovered for Esfandiar Pakdel.