Maryam Salari

Harvard University | Harvard · Harvard School of Public Health

An optimal methodology for locating and tracking cellulose nanofibers (CNFs) in vitro and in vivo is crucial to evaluate the environmental health and safety properties of these nanomaterials. Here, we report the use of a new boron-dipyrromethene (BODIPY) reactive fluorescent probe, meso-DichlorotriazineEthyl BODIPY (mDTEB), tailor-made for labeling...

Substitution of flammable, toxic solvents in electrolytes with alternative green options is of significant commercial and environmental interest.

The development of new electrolyte and electrode designs and compositions has led to advances in electrochemical energy-storage (EES) devices over the past decade. However, focusing on either the electrode or electrolyte separately is insufficient for developing safer and more efficient EES devices in various working environments, as the energy-sto...

The rapid adoption of nanocellulose-based engineered nanomaterials (CNM) by many industries generates environmental health and safety (EHS) concerns. This work presents the development of fluorescently tagged CNM which can be used to study their interactions with biological systems. Specifically, cellulose nano-fibrils and cellulose nano-crystals w...

The successful design of safer electrical energy storage devices must include the use of thermally stable, non-flammable, conductive electrolytes that perform at ambient temperatures as well as at higher temperatures [1-2]. Here, we report the synthesis of three glycerol carbonate (GlyC) solvents for use as electrolytes when combined with 1.0 M LIT...

Self-organized tubular nanostructures, synthesized through straightforward and efficient techniques, are anisotropic materials, catalyzing many research breakthroughs, and, are of interest as electrode materials for electrochemical microdevices. The fabrication and characterization of microsupercapacitors composed of self-assembled titanium dioxide...

Wearable chemical sensor technologies enable the opportunity to continuously collect physiologically information on an individual’s health status. This is in contrast to traditional blood draws and subsequent analysis. Using glucose oxidase as a model enzyme we compare several fabrication methods and describe an optimized glucose monitoring sensor...

Self-organized tubular metal oxide nanostructures, synthesized through straightforward and efficient techniques, have resulted in many breakthroughs yet are underutilized in the energy and microdevice field. Here we demonstrate the fabrication and characterization of unique biocompatible energy storage devices that use self-assembled titanium dioxi...

The increased number of electrical energy storage (EES) systems utilized in everyday products along with the demand for more reliable and safer products that provide high energy densities with faster response times over an extended range of temperatures are catalyzing advances across all areas of EES technology. Here, the preparation and performanc...

While pyrolysis holds promise for extracting biofuels from biomass, the low value of the biochar produced, combined with process energy requirements, make thermochemical conversion marginally viable. Likewise, while supercapacitors and fuel cells may satisfy growing demands for portable electronics and electric vehicles, current fossil-fuel based a...

With the ongoing global effort to reduce greenhouse gas emission and dependence on oil, electrical energy storage (EES) devices such as Li-ion batteries and supercapacitors have become ubiquitous. Today, EES devices are entering the broader energy use arena and playing key roles in energy storage, transfer, and delivery within, for example, electri...

The increased number of lithium ion batteries and supercapacitor technologies utilized in everyday products demands more reliable and safer technologies enabling high energy densities with faster response times over extended range of temperatures. This work presents a method to fabricate a thermally resistance lithium ion supercapacitor (LIC); a st...

The trade-off between performance and complexity of the device manufacturing process should be balanced to enable the economic harvest of solar energy. Here, we demonstrate a conceptual, yet practical and well-regulated strategy to achieve efficient solar photocatalytic activity in TiO2 through controlled phase transformation and disorder engineeri...

Rational design and processing are critical to the fabrication of high performance architectures. Although the fabrication of titania nanotube (TN) array films has been studied extensively during the last decade, fabrication of ordered nanoporous titania structures at ambient conditions still remains a challenge. In this work, we report a method fo...

The successful commercialization of smart wearable garments is hindered by the lack of fully integrated carbon-based energy storage devices into smart wearables. Since electrodes are the active components that determine the performance of energy storage systems, it is important to rationally design and engineer hierarchical architectures both at na...

Here, we present a facile route to establish and control a net negative charge on the surface of TiO2 nanotube as an enabling platform to achieve extraordinary capacitive behavior compared to conventional electric double layer capacitors. The engineering of the surface electrical properties of TiO2 nanotube resulted in an overall improvement in ele...

The structural evolution of nanocrystalline TiO2 was studied by X-ray diffraction (XRD) and the Rietveld refinement method (RRM). TiO2 powders were prepared by the sol-gel technique. Post annealing of as-synthesized powders in the temperature range from 500 degrees C to 800 degrees C under air and argon atmospheres led to the formation of TiO2 nano...

Here, we report the fabrication of self-organized titania (TiO(2)) nanotube array supercapacitor electrodes through controlled phase transformation of TiO(2), with aerial capacitances as high as 2.6 mF cm(-2), which far exceeds the values so far reported in the literature. The role of phase transformation in the electrochemical charge-discharge beh...

In this work, we employed an in situ spray pyrolysis approach to fabricate metal oxide-graphene composites with highly porous morphologies. The materials exhibited unique globular structures comprising metal oxide nanoparticles embedded between graphene sheets with high capacitance.

We report the synthesis of graphene oxide/multi-walled carbon nanotube (MWCNT) composites employing an alternative and novel approach for possible application as supercapacitor materials in energy storage devices. Integrating these nanostructures resulted in a strong synergistic effect between the two materials consequently leading to a robust and...

The many applications of high energy storage devices have forged an increasing interest in research areas related to electrochemical capacitors. Here, in this work, we present a facile method for the fabrication of self-organized titaniananotubes grown by anodic oxidation of titanium foil with different subsequent heat-treatment regimes for use as...

We report the synthesis of self-organized titania nanotubes and nanocrystalline titania powders employing an alternative and novel approach. Integrating these nanostructures in a binder-free working electrode improved the capacitance up to 911 μF cm(-2), which is around one to two orders of magnitude higher than the conventional electric double lay...

A solid-state reaction of TiOSO4.xH2SO 4.yH2O→TiO2 + (x+y)H2O + (x+1)SO3 was induced during milling to synthesis the titanium dioxide nanoparticles. Titanyl sulphate (TiOSO4.xH2O.yH 2SO4) and NaCl powders were used as the reactant and diluent phases, respectively. Annealing the as-milled powder at 700°C along with diluent phase and the removal of t...

Anatase and rutile TiO2 nanoparticles were synthesized via mechanochemical reaction and subsequent annealing of the products. TiO2 nanoparticles were prepared by the use of planetary ball milling of titanyl sulphate (TiOSO4.xH2O.yH2SO4) and NaCl powders as the reactant and diluent phases, respectively. In this paper, the effect of volume fraction o...

Mechanochemical processing of TiOSO4 precursor has been used to produce nanocrystalline powders of titania (TiO2). This process involves high energy ball milling of precursor with NaCl as diluent phase and post heat treatment of as-milled powder. Subsequent washing with distilled water was then used to recover a nanocrystalline titania by removing...

Mechanical alloying (MA) is a versatile technique to produce different nanocrystalline and amorphous alloys. The ability of producing immiscible elements is one of the specific advantages of this method. High energy shaker ball milling has been used to produce W–20wt.% Cu nanocomposite. Powders of elemental W (1–30μm) and Cu (1–15μm) were milled wi...

A novel preparation method for titanium dioxide (TiO2) nanoparticles is introduced in this paper. In this process, titanyl sulphate (TiOSO4·xH2SO4·yH2O) and NaCl powders were used as the reactant and diluent phases, respectively. In order to understand the thermal behavior of the reactant, thermo-gravimetric analysis/differential thermo-gravimetry...

Titanium dioxide nanoparticles have great potential for use in photocatalytic applications, cosmetics, white pigments and so on. In this paper, the effect of milling time on particle size, morphology and phase composition of TiO2 nanoparticles, prepared by mechanochemical method, was investigated by X-Ray Diffraction (XRD) and Scanning Electron Mic...