Mohsin hassan Saeed

University of Colorado Boulder | CUB · Department of Chemical and Biological Engineering (CHBE)

The increased prevalence of the Internet of Things (IoT) and the integration of digital technology into our daily lives have given rise to heightened security risks and the need for more robust security measures. In response to these challenges, physical unclonable functions (PUFs) have emerged as promising solution, offering a highly secure method...

The increasing prevalence of the Internet of Things (IoT) and the integration of digital technology into our daily lives have heightened security risks, necessitating more robust security measures. Physical unclonable functions (PUFs) have emerged as a promising solution, and PUFs offer a highly secure method to generate unpredictable and unique ra...

Elementary actuators performing branching or surface swelling are the primary units in the actuator integration system that is leveraged in works requiring a high versatility and complex motion. However, those primary actuator units often lack scalability or compatibility at assembly into a compact form due to the complexity of the structure and th...

Liquid crystals (LCs) offer a promising playground for developing reconfigurable radio frequency devices due to their unique dielectric properties, including large birefringence and tunability. Previous research on reconfigurable phase shifters has primarily focused on studying loss, response, and tunability. However, the influence of surface-enfor...

Recently, smart windows based on polymer‐dispersed liquid crystals (PDLCs) composites have garnered enormous interest owing to their electrically switchable properties. However, the low UV‐shielding characteristics of these films limit their widespread application. Here, we reported novel PDLC composite films doped with functionalized TiO2 nanopart...

In this work, we prepared polymer-dispersed liquid crystal (PDLC) films with good mechanical properties, high contrast ratio (CR), and low driving voltage (Vdr). These PDLC films included two different monomers, which were hydroxyl methacrylate monomers and fluorinated methacrylate monomers. The electro-optical properties, micro-structures and mech...

Quantum dots (QDs) are semiconductor nanoparticles (NPs) that have gained significant interest in the academia and industry because of their unique optoelectronic properties such as tunable emission wavelength, high color purity, wide color gamut, and high photoluminescence quantum yield. However, it remains a challenge to fabricate a QD colloid or...

Keywords: Oxygen heterocyclic acrylate Chain length High contrast ratio Low driving voltage Polymer dispersed liquid crystal A B S T R A C T The current work aimed to fabricate polymer dispersed liquid crystal (PDLC) films using het-erocyclic acrylate monomers containing oxygen atoms. The incorporation of oxygen heterocycles into the host polymer m...

2021): Effects of multifunctional acrylates and thiols on the morphology and electro-optical properties of polymer-dispersed liquid crystal films, Liquid Crystals, ABSTRACT In the present paper, influence of the functionality of thiol monomers and acrylate crosslinkers, as well as crosslinker chain length on the polymer morphologies and electro-opt...

Polymer dispersed liquid crystals (PDLCs) have kindled a spark of interest because of their unique characteristic of electrically controlled switching. However, some issues including high operating voltage, low contrast ratio and poor mechanical properties are hindering their practical applications. To overcome these drawbacks, some measures were t...

In this work, the effects of the methacrylate monomers with various end groups (methyl, hydroxyl, epoxy, tetrahydrofuran, cyclohexane, benzene and siloxane) on the morphologies, electro-optical and mechanical properties of polymer dispersed liquid crystal (PDLC) composite films were systematically investigated. The polymer network morphologies of t...

Fluorescence efficiency and stability of quantum dots (QDs) film, which are both key for optoelectronic device, are relatively difficult to be improved simultaneously. Herein, the facile synthesis of vinyl-ether terminated liquid crystals was reported. Based on the host vinyl-ether liquid crystals, the polymer dispersed vinyl-ether liquid crystals...

This contribution investigates the preparation of polymer-dispersed liquid crystal (PDLC) films based on meth(acrylate) monomers containing rigid structures. The current study specifically focuses on comparison of the monomers on the basis of meth(acrylate) side group, flexible/rigid structures and rigidity. We find that methacrylate monomers exhib...

In this work, a series of liquid crystal molecules containing cyano-phenyl-ester was designed and synthesised. Subsequently, a novel cyano-phenyl-ester liquid crystals (CPE-LCs) with a wide temperature range from −30°C to 96.4°C were developed by mixturing these liquid crystal compositions. Then as the host materials, the CPE-LCs were used for prep...

Optical diffusers are promising diffusing materials in the optical devices such as monitors, projectors, fibre optics, light-emitting diode (LED) systems and liquid crystal displays (LCDs). We report optical diffusers comprising uniformly distributed nano-sized polymer balls/nematic liquid crystals (LCs) by ultraviolet (UV) click reaction of ene mo...

With the increasing development of multifunction liquid crystal displays (LCDs), multifunction optical diffusers have attracted more attention. In this work, switchable optical diffusers based on the transient polymer balls-networks in polymer/nematic liquid crystal composite films have been prepared and investigated, and the effects of thiol conte...

Tungsten carbide has kindled a spark of interest because of its versatile properties for manufacturing of cutting tools. It has a broad range of applications for making the balls of ball point pen, bearings, nozzles, jewelry, ammunition, cutting and drilling tools, and electronic and mining equipment. Due to its high hardness, more than half of the...