Hybridization of organic and inorganic material opens many opportunities by taking the advantages of both materials. Cellulose is one of the most abundant material on earth which is biocompatible, cheap, lightweight, and environment friendly. Cellulose nanofibers (CNF) have high mechanical strength because of high crystallinity. Graphene Oxide (GO) is one forms of carbon which is produced from graphite flake. CNF and GO composites (CNFGO) can offer advantages in terms of mechanical strength as well as electrical properties. CNF is extracted from hardwood pulp using mild TEMPO treatment and aqueous counter collision (ACC). GO is synthesized from graphite flakes following improved synthesize of graphene oxide. CNFGO suspension is prepared using a simple blending method. CNFGO fiber is fabricated by spinning CNFGO suspension in CaCl<sub>2</sub> coagulation solution. The composite fiber is characterized using Scanning Electron Microscope (SEM), Fourier Transform Infrared (FTIR), X-Ray Diffraction (XRD). Mechanical Properties of the composite fibers is also investigated.
In the present investigation, calcinated tea-based cellulose composite films were fabricated via solution casting technique. The fabricated films were characterized by using Fourier transform infrared spectroscopy and differential scanning calorimetry. The effect of calcinated tea loading on the properties of the calcinated tea-based cellulose composite films was studied. The results were showed that the calcinated tea composite films display better mechanical properties and dielectric constant than the pure cellulose films.
The appeal of portable electronic devices is growing gradually, which increases the demand for flexible and renewable energy storage devices. Hybrid materials can be used as renewable and flexible electrode material for this kind of devices. Organic–inorganic hybrid materials represent a creative substitute to design new materials and composites by accepting advantages of both materials. This paper reports the possibility of renewable cellulose and graphene composite as an electrode material for energy storage device such as supercapacitor. The morphology and structure of the nanocomposite are studied using scanning electron microscope and Energy-dispersive X-ray Spectroscopy. The performance of the composite as supercapacitor electrode material is evaluated by cyclic voltammograms and galvanostatic charge-discharge curves.
Hybrid composites with organic and inorganic materials are drawing interest to researchers by adopting advantages of
organic materials and inorganic materials. Cellulose is biocompatible, cheap, environmentally friendly, renewable and
lightweight material. Nano crystalline form of cellulose (CNC) is a needle like rigid structure with a very high mechanical
strength. Graphene, crystalline forms of carbon, provides basic platform for many electronic and optoelectronic devices.
This paper introduces the fabrication process of cellulose nanocrystal/graphene oxide blended nanocomposite film.
Cellulose nanocrystal/graphene oxide nanocomposite films are prepared by mixing graphene oxide (GO) into cellulose
nanocrystal suspension using ultrasonic homogenizer. Scanning electron microscopy is used to study morphology. Optical
properties of the composite was characterized to evaluate the change in transparency after addition of GO in CNC.
Ultrasonic haptics actuator is a device that can create a haptic feedback to user’s hand. The modulation of ultrasonic frequency can give different textures to the users. In this study, a feasibility of the ultrasonic haptic actuator made on a flexible piezoelectric substrate is investigated. As the piezoelectric substrate helps to propagate flexural waves, a pair of interdigital transducer (IDT) with reflectors can produce standing waves, which can increase the vibrational displacement of the actuator. A pair of IDT pattern was fabricated on a piezoelectric polymer substrate. A finite element analysis is at first performed to design the actuator. A sinusoidal excitation voltage is applied on IDT electrodes at ultrasonic frequencies and the displacement waveforms are found. The displacement waveforms clearly represent how ultrasonic waves propagate through the piezoelectric substrate.
Array haptic actuator to realize texture of button for virtue flight simulator is fabricated by using cellulose acetate (CA)
film. The haptic actuator has independent 3 × 3 cells for identical vibration. Each cell consists of topside CA layer and
bottomside CA layer with two pillars. Two ends of topside CA layer are fixed on the pillars similar with fixed end beam.
By an electrostatic force in the presence of electric field, the topside CA layer vibrates. Each cell shows its resonance
frequency peak in the capable frequency range of vibrotactile feeling from 100 Hz to 500 Hz. The acceleration
performance is shown to be higher than vibrotactile threshold on wide frequency band from 100 Hz to 400 Hz.
Development of tactile sensing technology has promoted intelligent human-machine interaction and recently has evolved out as one of the most promising area of electronics. Tactile sensing is a milestone in this field as it can extend the detection mode of tactile sensor through air. In this paper, we fabricated a tactile sensor using cellulose nanocrystal modified with graphene by isocyanate grafting. The new material is transparent, ecofriendly and integrated the capability of tactile sensing with fast response, high stability and high reversibility. Various materials from conducting metals to a human hand were checked for tactile sensing capability. It is found that the fabricated sensor could detect a human hand at a distance up to 6 mm away from the sensor. Combining the results, the discrete, flexible dual-mode tactile sensor fulfilled the technical and operational objectives of this work .
Cellulose is one of attractive natural polysaccharides in nature due to its good chemical stability, mechanical strength, biocompatibility, hydrophilic, and biodegradation properties [1-2]. The main disadvantages of biopolymer films like cellulose are their poor mechanical properties. Modification of polymers with inorganic materials is a new way to improve polymer properties such as mechanical strength [3-4]. Presently, the use of graphene/graphene oxide (GO) in materials research has attracted tremendous attention in the past 40 years in various fields including biomedicine, information technology and nanotechnology[5-7]. Graphene, a single sheet of graphite, has an ideal 2D structure with a monolayer of carbon atoms packed into a honeycomb crystal plane. Using both experimental and theoretical scientific research, researchers including Geim, Rao and Stankovich [8-10] have described the attractiveness of graphene in the materials research field. Due to its sp<sup>2</sup> hybrid carbon network as well as extraordinary mechanical, electronic, and thermal properties, graphene has opened new pathways for developing a wide range of novel functional materials. Perfect graphene does not exist naturally, but bulk and solution processable functionalized graphene materials including graphene oxide (GO) can now be prepared [11-13].The large surface area of GO has a number of functional groups, such as -OH, -COOH, -O- , and C=O, which make GO hydrophilic and readily dispersible in water as well as some organic solvents , thereby providing a convenient access to fabrication of graphene-based materials by solution casting. According to several reports [15-17], GO can be dispersed throughout a selected polymer matrix to make GO-based nanocomposites with excellent mechanical and thermal properties. Since GO is prepared from low-cost graphite, it has an outstanding price advantage over CNTs, which has encouraged studies of GO/synthetic polymer composites [18-20]. In some reported papers, graphene oxide has also been used to reinforce polysaccharide matrices such as carboxymethyl cellulose-starch. Here, we report a simple and environmentally benign preparation of GO/cellulose nanocomposite films by a simple solution mixing-curing method.