Kartik Nemani

• PhD Candidate
• Graduate Research Assistant at Indiana University – Purdue University Indianapolis

MXenes are a family of two‐dimensional (2D) transition metal carbides, nitrides, and carbonitrides with potential applications in ceramics and composites due to their nanometer‐thick morphology, hydrophilic surfaces, and negative zeta potentials. In this study, we investigated titanium carbide MXene (Ti3C2Tx) as an additive in ultra‐high‐temperatur...

There is controversy surrounding the moniker “high-entropy” materials due to the unclear effect of entropy and enthalpy. The unique nanolayered structure of MAX phases, with its structural covalent-metallic-covalent carbide interfaces, allowed us to address this controversy systematically. Here, we synthesized nearly 40 known and novel MAX phases c...

Transition metal carbides have been adopted in energy storage, conversion, and extreme environment applications. Advancements in their 2D counterparts, known as MXenes, enable the design of unique structures at the ~1 nm thickness scale. Alkali cations have been essential in MXenes manufacturing processing, storage, and applications, however, exact...

Transition metal carbides have been adopted in energy storage, conversion, and extreme environment applications. Advancement in their 2D counterparts, known as MXenes, enables the design of unique structures at the ~1 nm thickness scale. Alkali cations have been essential in MXenes manufacturing processing, storage, and applications, however, exact...

Nanomaterial reinforced metal matrix composites can serve to enable multifunctional nanocomposites. Particularly, 2D materials, with their high aspect ratio and ideal mechanical and electrical properties, promise to enable multifunctional composites beyond typical ceramic or carbon reinforcement materials. However, creating a homogenous distributio...

MXenes, two-dimensional transition metal carbides, nitrides, and carbonitrides, have been investigated for diverse applications since their discovery, however, their life cycle analysis (LCA) has not been studied. Here, we perform a "cradle to gate" LCA to assess the cumulative energy demand (CED) and environmental impacts of lab-scale synthesis of...

To advance the MXene field, it is crucial to optimize each step of the synthesis process and create a detailed, systematic guide for synthesizing high‐quality MXene that can be consistently reproduced. In this study, a detailed guide is provided for an optimized synthesis of titanium carbide (Ti3C2Tx) MXene using a mixture of hydrofluoric and hydro...

Multiple principal element or high-entropy materials have recently been studied in the two-dimensional (2D) materials phase space. These promising classes of materials combine the unique behavior of solid-solution and entropy-stabilized systems with high aspect ratios and atomically thin characteristics of 2D materials. The current experimental spa...

Expanding the MXene design space from ordered and random double-transition-metal (DTM) MXenes to include high-entropy (HE) MXenes with four or more principal elements enables a powerful approach for enhancing MXene properties. While many DTM MXenes possess unique structures that strongly influence material properties, HE MXenes are largely unknown...

As the most studied two-dimensional (2D) material from the MXene family, Ti3C2Tx has constantly gained interest from academia and industry. Ti3C2Tx MXene has the highest electrical conductivity (up to 24,000 S cm-1) and one of the highest stiffness values with a Young's modulus of ∼ 334 GPa among water-dispersible conductive 2D materials. The negat...

Two-dimensional transition metal carbides, nitrides, and carbonitrides (known as MXenes) have evolved as competitive materials and fillers for developing composites and hybrids for applications ranging from catalysis, energy storage, selective ion filtration, electromagnetic wave attenuation, and electronic/piezoelectric behavior. MXenes’ incorpora...

Two-dimensional (2D) transition metal carbides and nitrides, known as MXenes, are a fast-growing family of 2D materials. MXenes 2D flakes have n + 1 (n = 1-4) atomic layers of transition metals interleaved by carbon/nitrogen layers, but to-date remain limited in composition to one or two transition metals. In this study, by implementing four transi...

Two-dimensional (2D) transition metal carbides, nitrides, and carbonitrides, known as MXenes, are under increasing pressure to meet technological demands in high-temperature applications, as MXenes can be considered as one of the few high temperature 2D materials. Although there are studies on the stability of their surface functionalities, there i...

MXene/polymer nanocomposites simultaneously benefit from the attractive properties of MXenes and the flexibility and facile processability of polymers. These composites have shown superior properties such as high light-to-heat conversion, excellent electromagnetic interference shielding, and high charge storage, compared to other nanocomposites. Th...

p>Two-dimensional (2D) transition metal carbides and nitrides, known as MXenes, are a fast-growing family of 2D materials. MXenes 2D flakes have n + 1 ( n = 1 – 4) atomic layers of transition metals interleaved by carbon/nitrogen layers, but to-date remain limited in composition to one or two transition metals. In this study, through the use of fou...

MXenes are a large family of two-dimensional (2D) transition-metal carbides, nitrides, and carbonitrides. The MXene family has expanded since their original discovery in 2011, and has grown larger with the discovery of ordered double transition-metal (DTM) MXenes. These DTM MXenes differ from their counterpart mono-transition-metal (mono-M) MXenes,...

Electro-, photo-, and photoelectrocatalysis play a critical role toward the realization of a sustainable energy economy. They facilitate numerous redox reactions in energy storage and conversion systems, enabling the production of chemical feedstock and clean fuels from abundant resources like water, carbon dioxide, and nitrogen. One major obstacle...

Self-propelled jumping of condensate droplets (dew) enables their easy and efficient removal from surfaces and is essential for enhancing condensation heat transfer coefficient and for delaying frost growth rate on supercooled surfaces. Here, we report the droplet-jumping phenomenon using nanoporous vertically-aligned carbon nanotube (VA-CNT) micro...

A micro/nano-scale approach is exercised to study fundamentals of scale formation, deposition, and adhesion to engineered surfaces. Scales of salt (CaSO4.2H¬2O) crystals are formed, cut in micron-size using a focused ion-beam (FIB), and adhered to a tip-less cantilever beam using a micro-manipulator setup to study their adhesion strength to various...

Conformal coating of cylindrically‐patterned carbon nano tube micropillars with a dielectric poly‐tetravinyltetrameth ylcyclotetrasiloxane) (PV4D4) film using initiated chemical vapor deposition (iCVD), followed by lithiation for 3 days in a 1 M solution of LiClO4 in propylene carbonate (PC) and annealing at 110 °C for 1 hour, results in partial ca...

We present an electrochromic device (ECD) fabricated using PEDOT:PSS and graphene as active conductive electrode films and a flexible compliant polyurethane substrate with 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide (EMI-TSFI) additive, as ionic medium. This device with a docile, elastic intermediate substrate along with a transpa...

The barrier performance of CVD graphene films was determined using a poly(3-hexylthiophene) (P3HT) thin film optical transmission test. P3HT is a semiconducting polymer that photo-oxidatively degrades upon exposure to oxygen and light. The polymer is stable under ambient conditions and indoor lighting, enabling P3HT films to be deposited and encaps...