Browsing by Author "Javed, Kashif"

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Development of Highly Flexible Piezoelectric PVDF-TRFE/Reduced Graphene Oxide Doped Electrospun Nano-Fibers for Self-Powered Pressure Sensor
(MDPI, 2024-06-24) Ahmed, Arsalan; Khoso, Nazakat Ali; Arain, Muhammad Fahad; Khan, Imran Ahmad; Javed, Kashif; Khan, Asfandyar; Memon, Sanam Irum; Fan, Qinguo; Shao, Jianzhong
The demand for self-powered, flexible, and wearable electronic devices has been increasing in recent years for physiological and biomedical applications in real-time detection due to their higher flexibility and stretchability. This work fabricated a highly sensitive, self-powered wearable microdevice with Poly-Vinylidene Fluoride-Tetra Fluoroethylene (PVDF-TrFE) nano-fibers using an electrospinning technique. The dielectric response of the polymer was improved by incorporating the reduced-graphene-oxide (rGO) multi-walled carbon nano-tubes (MWCNTs) through doping. The dielectric behavior and piezoelectric effect were improved through the stretching and orientation of polymeric chains. The outermost layer was attained by chemical vapor deposition (CVD) of conductive polymer poly (3,4-ethylenedioxythiophene) to enhance the electrical conductivity and sensitivity. The hetero-structured nano-composite comprises PVDF-TrFE doped with rGO-MWCNTs over poly (3,4-ethylenedioxythiophene) (PEDOT), forming continuous self-assembly. The piezoelectric pressure sensor is capable of detecting human physiological vital signs. The pressure sensor exhibits a high-pressure sensitivity of 19.09 kPa−1, over a sensing range of 1.0 Pa to 25 kPa, and excellent cycling stability of 10,000 cycles. The study reveals that the piezoelectric pressure sensor has superior sensing performance and is capable of monitoring human vital signs, including heartbeat and wrist pulse, masticatory movement, voice recognition, and eye blinking signals. The research work demonstrates that the device could potentially eliminate metallic sensors and be used for early disease diagnosis in biomedical and personal healthcare applications.
Eco-friendly dyeing of cotton with natural colorants using natural mordants obtained from aloe vera
(Scopus, 2024-08) Rehman, Abdur; Rehman, Muneeb ur; Naveed, Maryam; Javed, Kashif; Khan, ,Asfandyar
Due to sustainable and green processing requirements from buyers, the researchers are working on natural dyes to dye textile materials. In this study, cotton fabric was successfully dyed with a natural colorant which was extracted from black tea, and aloe vera was used as a natural mordant to enhance the fixation of natural dyes. The aqueous extraction method was used to extract colorant from black tea powder in a water bath at the temperature of 85–95 °C for 60 min. Three mordanting techniques were applied for cotton dyeing by changing parameters such as dye concentration (2, 4, 8 % o.w.f) and mordant concentration (20, 40, and 60 g/L). Pretreated cotton fabric was dyed on a high-temperature (HT) dyeing machine at 80 °C for 40 min at pH 5.5. The dyed cotton samples were analyzed for color strength (K/S), colorfastness, and antibacterial assessment (qualitative) using standard test protocols. The results showed that the maximum color strength value was achieved with 8 % dye and 60 g/L mordant using pre mordanting method. The dyed fabrics revealed excellent colorfastness to washing, whereas the color fastness to light, perspiration, and crocking was satisfactory. The antibacterial property of the dyed fabric was also satisfactory which is confirmed by no colonial growth on or below the samples. In a nutshell, this study presented an ecofriendly approach using black tea leaves and aloe vera contributing to green and sustainable production
Eco-friendly Dyeing of Cotton with Natural Colorants Using Natural Mordants Obtained from Aloe Vera
(Elsevier, 2024-08-15) Rehman, Abdur; Rehman, Muneeb Ur; Naveed, Maryam; Javed, Kashif; Khan, Asfandyar
Due to sustainable and green processing requirements from buyers, the researchers are working on natural dyes to dye textile materials. In this study, cotton fabric was successfully dyed with a natural colorant which was extracted from black tea, and aloe vera was used as a natural mordant to enhance the fixation of natural dyes. The aqueous extraction method was used to extract colorant from black tea powder in a water bath at the temperature of 85–95 °C for 60 min. Three mordanting techniques were applied for cotton dyeing by changing parameters such as dye concentration (2, 4, 8 % o.w.f) and mordant concentration (20, 40, and 60 g/L). Pretreated cotton fabric was dyed on a high-temperature (HT) dyeing machine at 80 °C for 40 min at pH 5.5. The dyed cotton samples were analyzed for color strength (K/S), colorfastness, and antibacterial assessment (qualitative) using standard test protocols. The results showed that the maximum color strength value was achieved with 8 % dye and 60 g/L mordant using pre mordanting method. The dyed fabrics revealed excellent colorfastness to washing, whereas the color fastness to light, perspiration, and crocking was satisfactory. The antibacterial property of the dyed fabric was also satisfactory which is confirmed by no colonial growth on or below the samples. In a nutshell, this study presented an ecofriendly approach using black tea leaves and aloe vera contributing to green and sustainable production.
Recycling Orange Waste for the Sustainable Dyeing of Polyester Fabric
(Elsevier, 2024-10-10) Hussain, Touqeer; Arain, Muhammad Fahad; Khan, Imran Ahmad; Javed, Kashif; Khan, Hamza; Ahmed, Arsalan; Khan, Asfandyar
This research marks the first instance of employing an orange peel powder (OP) for the environmentally friendly one-bath extraction and dyeing of 100 % polyester fabric through the exhaust method. OP is an abundant, cost-effective, and readily available agricultural byproduct. Powder extract derived from orange peel (OP) was used to dye polyester fabrics in an Infrared (IR) dyeing machine. Here, the one-bath extraction and application method was adapted to contribute towards sustainable development goals. Effects of dyeing parameters, including pH value, dyeing time, and concentration of OP extract powder on the colours of the dyed polyester fabrics, were studied. FTIR analysis of the orange peel powder revealed the presence of alcohol and ester functional groups. SEM and EDS spectroscopic techniques were employed to examine the morphological characteristics and elemental composition of both undyed and dyed fabrics. CIELAB and K/S values of the samples were recorded using a data colour spectrometer. The dyed samples exhibited exceptional washing fastness, with minimal staining (as observed on multifiber strips) and colour alteration. The optimal dyeing temperature, dyeing time, dye concentration, and pH were observed to be 100 °C, 90 min, 20 %, and 5.5 respectively. Interestingly, the value of the UV-protection Factor (UPF) of the polyester fabric dyed with OP extracts was approximately 6 times higher than that of the undyed fabric. Furthermore, the dyed samples also revealed a good mosquito repellency. In general, the natural dye from OP could minimize environmental pollution, save energy, and enhance the livelihoods of farmers. The recycling of this agricultural byproduct has significant potential as a natural textile dye for polyester fabrics, offering remarkable mosquito repellency and UV-protection properties.
Recycling Orange Waste for the Sustainable Dyeing of Polyester Fabric
(Elsevier, 2024-10-15) Hussain, Touqeer; Arain, Muhammad Fahad; Khan, Imran Ahmad; Javed, Kashif; Khan, Hamza; Ahmed, Arsalan; Khan, Asfandyar
This research marks the first instance of employing an orange peel powder (OP) for the environmentally friendly one-bath extraction and dyeing of 100 % polyester fabric through the exhaust method. OP is an abundant, cost-effective, and readily available agricultural byproduct. Powder extract derived from orange peel (OP) was used to dye polyester fabrics in an Infrared (IR) dyeing machine. Here, the one-bath extraction and application method was adapted to contribute towards sustainable development goals. Effects of dyeing parameters, including pH value, dyeing time, and concentration of OP extract powder on the colours of the dyed polyester fabrics, were studied. FTIR analysis of the orange peel powder revealed the presence of alcohol and ester functional groups. SEM and EDS spectroscopic techniques were employed to examine the morphological characteristics and elemental composition of both undyed and dyed fabrics. CIELAB and K/S values of the samples were recorded using a data colour spectrometer. The dyed samples exhibited exceptional washing fastness, with minimal staining (as observed on multifiber strips) and colour alteration. The optimal dyeing temperature, dyeing time, dye concentration, and pH were observed to be 100 °C, 90 min, 20 %, and 5.5 respectively. Interestingly, the value of the UV-protection Factor (UPF) of the polyester fabric dyed with OP extracts was approximately 6 times higher than that of the undyed fabric. Furthermore, the dyed samples also revealed a good mosquito repellency. In general, the natural dye from OP could minimize environmental pollution, save energy, and enhance the livelihoods of farmers. The recycling of this agricultural byproduct has significant potential as a natural textile dye for polyester fabrics, offering remarkable mosquito repellency and UV-protection properties.
Recycling orange waste for the sustainable dyeing of polyester fabric
(Scopus, 2024-10) Hussain, Touqeer; Arain, Muhammad Fahad; Khan, Imran Ahmad; Javed, Kashif; Khan, Hamza; Ahmed, Arsalan; Khan, Asfandyar
This research marks the first instance of employing an orange peel powder (OP) for the environmentally friendly one-bath extraction and dyeing of 100 % polyester fabric through the exhaust method. OP is an abundant, cost-effective, and readily available agricultural byproduct. Powder extract derived from orange peel (OP) was used to dye polyester fabrics in an Infrared (IR) dyeing machine. Here, the one-bath extraction and application method was adapted to contribute towards sustainable development goals. Effects of dyeing parameters, including pH value, dyeing time, and concentration of OP extract powder on the colours of the dyed polyester fabrics, were studied. FTIR analysis of the orange peel powder revealed the presence of alcohol and ester functional groups. SEM and EDS spectroscopic techniques were employed to examine the morphological characteristics and elemental composition of both undyed and dyed fabrics. CIELAB and K/S values of the samples were recorded using a data colour spectrometer. The dyed samples exhibited exceptional washing fastness, with minimal staining (as observed on multifiber strips) and colour alteration. The optimal dyeing temperature, dyeing time, dye concentration, and pH were observed to be 100 °C, 90 min, 20 %, and 5.5 respectively. Interestingly, the value of the UV-protection Factor (UPF) of the polyester fabric dyed with OP extracts was approximately 6 times higher than that of the undyed fabric. Furthermore, the dyed samples also revealed a good mosquito repellency. In general, the natural dye from OP could minimize environmental pollution, save energy, and enhance the livelihoods of farmers. The recycling of this agricultural byproduct has significant potential as a natural textile dye for polyester fabrics, offering remarkable mosquito repellency and UV-protection properties.