Role of Surface Chemistry of Ta Metal Foil on the Growth of GaN Nanorods by Laser Molecular Beam Epitaxy and Their Field Emission Characteristics.

This study investigates the influence of surface nitridation of Ta metal foil substrates on the growth of GaN nanorods using the laser molecular beam epitaxy (LMBE) technique and the field emission characteristics of the grown GaN nanorod ensemble. Surface morphology examinations underscore the pivotal role of Ta foil nitridation in shaping the dimensions and densities of GaN nanorods. Bare Ta foil fosters the formation of high-density, vertically self-aligned GaN nanorods at a growth temperature of 700 °C. Furthermore, the density of these nanorods is directly related to the duration of Ta foil nitridation, with increased duration leading to a reduced nanorod density. X-ray Photoelectron Spectroscopy (XPS) studies reveal that the transition of the Ta foil surface from tantalum oxide to tantalum nitride during nitridation emerges as a crucial factor influencing GaN nanorod growth. Photoluminescence (PL) spectroscopy at ambient temperature reveals a strong near-band-edge (NBE) emission peak with negligible defect-related peaks, displaying the high optical quality of the GaN nanorods. The highly dense vertically aligned GaN nanorod ensemble growth without Ta prenitridation exhibits the most favorable field emission performance, featuring a turn-on field of 2.1 V/µm, a field enhancement factor of 2480, and a stable long-term operation at the emission current density of 2.26 mA/cm2. This study advances the understanding of the role of the surface chemistry of metal foil in determining GaN nanorod growth and opens up exciting possibilities for tailoring advanced optoelectronic devices for specific application requirements.

Hemodynamically stable very low birth neonates weight gain is affected by the early initiation of full enteral feedings compared to standard feeding.

BACKGROUND: Premature babies need to develop similarly to fetuses of the same gestational age. The majority of premature neonates experience a growth-restricted status while in the patent ductus arteriosus (PDA). Extrauterine growth failure is a significant barrier for infants with very low birth weight (VLBW). MATERIALS AND METHODS: The study was conducted for six months at the Neonatology Unit, Department of Pediatrics, Coimbatore Medical College Hospital, Coimbatore, Tamil Nadu, India. Neonates with VLBW who met the inclusion criteria were assigned randomly to one of two feeding strategies, that is, full enteral feeding or partial feeding, based on the randomization sequence discovered by opening the sealed cover. The duration of stay, weight variation, neonatal variables, feeding intolerance, necrotizing enterocolitis (NEC), septicemia, apnea, newborn hyperbilirubinemia, PDA, hypoglycemia, intracranial bleeding, and mortality of neonatal recruits were all carefully evaluated. RESULTS: Two thousand two hundred eighty-four neonates were hospitalized throughout the six-month trial period, and 408 had low birth weight. Three hundred forty-two babies were eliminated from the study due to hemodynamic instability, persistent respiratory distress, infections, metabolic issues, and congenital abnormalities. Sixty-six babies met the study's inclusion criteria, and thus participated in the study. Sixty-six newborns weighed between 1.251 and 1.500 kg. Randomly assigning intervention and control groups. Thirty-three newborns were assigned to group A (intervention) and another 33 to group B (control). CONCLUSIONS: The study concluded that enteral feeding was effective, inexpensive, secure, and feasible. Early full enteral feeding reduced septicemia and infant hyperbilirubinemia. Thus, we must start enteral feeding as soon as possible to avoid inadequate nutrition in neonates with VLBW during a crucial growth period.

Synthesis and Incorporation of Quaternary Ammonium Silane Antimicrobial into Self-Crosslinked Type I Collagen Scaffold: A Hybrid Formulation for 3D Printing.

Novel 3D-biomaterial scaffold is constructed having a combination of a new quaternary ammonium silane (k21) antimicrobial impregnated in 3D collagen printed scaffolds cross linked with Riboflavin in presence of d-alpha-tocopheryl poly(ethyleneglycol)-1000-succinate. Groups of "0.1% and 0.2% k21", and "0.1% and 0.2% Chlorhexidine (CHX)" are prepared. k21/CHX with neutralized collagen is printed with BioX. Riboflavin is photo-activated and examined using epifluorescence for Aggregatibacter actinomycetemcomitans (7-days). Collagen is examined using TEM and measured for porosity, and shape-fitting. Raman and tandem mass/solid-state are performed with molecular-docking and circular-dichroism. X-ray diffractions, rheological tests, contact angle, and ninhydrin assay are conducted. k21 samples demonstrated collagen aggregates while 0.1% CHX and 0.2% CHX showed irregularities. Porosity of control and "0.1% and 0.2% k21" scaffolds show no differences. Low contact angle, improved elastic-modulus, rigidity, and smaller strain in k21 groups are seen. Bacteria are reduced and strong organic intensities are seen in k21 scaffolds. Simulation shows hydrophobicity/electrostatic interaction. Crosslinking is observed in 0.2% CHX/79% and 0.2% k21/80%. Circular dichroism for k21 are suggestive of triple helix. XRD patterns appear at d = 5.97, 3.03, 2.78, 2.1, and 2.90 A°. 3D-printing of collagen impregnated with quaternary ammonium silane produces a promising scaffold with antimicrobial potency and structural stability.