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건식코팅장치를 이용하여 제조한 NH2-HNT를 충진재로 응용한 에폭시 복합체의 기계적 물성 향상
김문일 한국산업융합학회 2024 한국산업융합학회 논문집 Vol.27 No.2
Epoxy resins are widely used in various fields due to their high adhesion, mechanical strength, and solvent resistance. However, as the volume decreases during the hardening process and the cooling process after hardening, stress is generated and when an external force is applied, the brittle material exhibits destruction behavior. To complement this, research has been conducted using inorganic nanofillers such as halloysite nanotube(HNT). HNT has a nanotube structure with the chemical formula of Al2Si2O5(OH)4· nH2O and is a natural sediment of aluminosilicate. It has been used as additive to improve the mechanical properties of epoxy composites with exchange of amine group as a terminal functional group. In order to simplify complicated procedures of common wet method, a dry coating machine was designed and used for amine group exchange in previous research. In this study, they were applied as filler in epoxy composites, and mechanical properties such as tensile strength and flexural strength of composites were examined.
金文一,金正浩 연세대학교 대학원 1975 延世論叢 Vol.12 No.2
Changes of alloy layer in the aluminized iron obtained by hot-dipping plocess at various temperatures and times haute been investigated for electroytic iron, carbon steel and cast iron with the aid of micrography. The findings of the experimental work are summarized as fellows. (1) At At lower dipping temperature, the alloy layer of electrolytic iron was much thicker than that of carbon steel and cast iron; in this case, however, no remarkable difference in thickness was observed between carbon steel and cast iron. On the other hand, when specimen was dipped at a higher temperature and maintainedfor a longer time, the layer of carbon steel markedly incarsed while cast iron showed slight growth of the layer to 775℃. (2) Impurities in iron such as C, Si and Mn were considered to inhibit the growth of alloy layer. At an elevated temperature, however, the inhibiting effect of the impurities was much lessened for carbon steel, probably because of homogenization in the structure of carbon steel at temperature above transformation point.
김문일,이창수,박현규 한국식물생명공학회 2006 JOURNAL OF PLANT BIOTECHNOLOGY Vol.33 No.3
Nanobiotechnology, the interdisciplinary area at the crossroad of biotechnology and nanoscience, combines contributions from molecular and cell biology, chemisty, material science, and physics in an attempt to understand the behavior of nanobiomaterials, their development and applications. At present, nanobiotechnology is believed to hold great promise for improving health and prolonging life, faciliating biomarker discovery, molecular diagnostics, discovery of novel drugs and drug delivery, which are important basic components of biomedical science. In the recent trend of nanobiotechnology, this review is intended to provide a better understanding of nanobiotechnology in its applications and perspectives, separating this integration technology into three parts such as nanobiochip/sensor, nanobiomaterials, and nanobioanalysis in order to hopefully gain insights into why size matters, how nano-materials and -devices can be engineered.
Martensite 系 Stainless 鋼의 A1 被覆處理에 關하여
金文一,金基敦 연세대학교 대학원 1978 延世論叢 Vol.15 No.-
The changes of alloy layer in the aluminized steel obtained by hot-dipping process at various temperatures and various times have been investigated for AISI 410 which is martensitic stainless steel with the aid of micrography and hardness test. The findings of the experimental work are summarized as follows. (1) In martensitic stainless steel the alloy layer consisted of thick-pure alloy layer, and thin mixed layer. (2) The thickness of the mixed layer increased with the increase of that of the alloy layer and decreased with the decrease of that of the alloy layer. (3) The maximum handness of the alloy layer was about Hv 800 in this studies, and as a result of hardness test from base layer to aluminum layer, it`s handness showed similar feature independent of the prehistory of specimen. (4) It could be found that the preheating treatment had a better effect on the Al coating rather than non-preheating treatment and the preheating treatment over 2 minutes had no more effect. (5) It was found that the layer known as the pure alloy layer was composed of two kinds of alloy layer in fact.
김문일,Fenghao Cui 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.7
A pseudo-analytical solution for a Nonsteady-state Biofilm Model (NSBM) was used to describe heterotrophic and autotrophic biofilms within aerobic granules. This model was validated with the experimental results obtained from a granule-based SBR process that removes organics and ammonia simultaneously. The calibrated model (with boundary conditions including involved species, operating conditions, granular characteristics and biological reactions) predicted effluent COD and NH4 values that were in good agreement with the measured values. The model simulation showed that the increase of the substrate concentration did not dramatically influence the flux trends if the biomass concentration in the reactor is insufficient (less than 1000 mg VSS/L). The heterotrophic and autotrophic biofilms develop layer by layer on the outside of the aerobic granules. These can form simultaneously in independent patterns for substrate utilization and biomass growth. The NSBM could be an effective prediction method for the understanding of aerobic granulation.