Assembly Area Research Articles

The Mu2e crystal and SiPM calorimeter

The calorimeter of the Mu2e experiment is being assembled, with all production components completed and tested, apart from the digital electronics that is still underway. The mechanical structure is fully built, with a complete integration and test of all the analog sensors and electronics. We summarize construction and assembly phases, Quality Control tests, calibration procedures and first tests performed in the assembly area, as well as the installation and commissioning plans of the final disks in the Mu2e hall.

Rough-surfaced polybenzimidazole membranes incorporating sulfonated porous aromatic frameworks for simultaneous enhancement of proton conduction and membrane electrode assembly optimization

The interface between the proton exchange membrane (PEM) and the catalyst layer (CL) has a substantial impact on the performance of high-temperature proton exchange membrane fuel cells (HT-PEMFCs). However, studies on the interface in HT-PEMFCs have been rarely reported. In this work, an effective strategy to mitigate interface problems was designed. A rough-surfaced membrane was successfully constructed by depositing high-surface-area sulfonated porous aromatic frameworks (SPAFs) in poly[2,2′ −(p-oxydiphenylene)-5,5′ −benzimidazole (OPBI) to achieve a dual goal. The catalyst was sprayed on the rough-surfaced side of the composite membranes, and the surface area was significantly increased. Meanwhile, an efficient proton transport pathway within the rough-surfaced membrane was constructed based on hydrophilic nanochannels in SPAFs. As a result, a substantial increase of 1.7 times in the electrochemical surface area (ECSA) of the membrane electrode assembly (MEA) was achieved relative to that of a flat membrane. Compared to a pristine OPBI membrane, the membrane with a high content of 20 wt% SPAFs exhibits a 236% increase in proton conductivity at 170 °C and a considerable 1.82-fold enhancement in fuel cell performance under analogous circumstances. This strategy, which simultaneously enhances the proton conductivity of the membrane and strengthens the interface between the membrane and the catalyst layer, provides a new approach to improving the performance of HT-PEMFC.

Empirische Ergebnisse zum Einsatz von Assistenzsystemen in der Montage

Abstract As part of the survey, data was collected from 158 study participants in order to gain an overview of the importance of the technologies used in assembly and the objectives pursued with their use. The results of the survey indicate that assistance systems are considered important by the respondents and will be part of the original equipment in new assembly areas in the future. Technologies that are already established include the provision of digital assembly instructions via a screen and pick-by-light, which are linked to the relevant experience. In addition to these technologies, human-robot collaboration (HRC) and the provision of visual information by means of projection or data glasses, possibly supported by augmented reality, will also become established in the future. At present and in the future, the main objectives will be to reduce work errors, increase productivity, reduce the training time for new employees, and cut assembly costs.

Monitoring model for enhancing adaptability in human–robot collaborative mold assembly

ABSTRACT Molds are assembled manually due to their inherent characteristics of low-volume and high-variety production. Given the ergonomic risks caused by heavy-handling and repetitive tasks and diverse requirements in mold assembly, collaborative robots offer adaptability and ease of reconfiguration, making them potential solutions to these challenges. This study introduces a monitoring model for human–robot collaborative mold assembly using two cobots. This model encompasses manual progress monitoring for cobot execution and position-sharing modules. Manual task actions are detected using the You-Only-Look-Once-v8 Nano model. Detected actions are subsequently classified into different states. These identified states are relayed to the cobots, enabling early execution and controlling the cobots’ entry into the assembly area. This study proposes a position-sharing approach to prevent collisions by receiving coordinates via Modbus between the two cobots. Most existing research has developed separate models for action and part recognition, excluding the utilization of recognition results to enable early execution. This study contributes to a novel model for monitoring manual progress to enable early execution of subsequent tasks and facilitate communication through position sharing during human–robot collaborative mold assembly tasks. The results show that assembly time and the risk of collisions between cobots can be reduced in human–robot collaborative mold assembly tasks.

Evaluation of Qualifications of Emergency Assembly Areas in Istanbul using the Spherical Fuzzy MAIRCA Process

Disasters are inevitable facts of life. It is difficult to deal with disasters and emergencies because of the uncertainties they contain. Managing disasters and emergencies requires integrity with before and after processes. No matter how well-informed people may be when faced with a disaster, they may not act consciously due to the shock of the event, fear and anxiety. Therefore, the recovery phase after a disaster is very important. In the presented paper, meeting areas after a disaster for Istanbul, which is one of the closest witnesses of the earthquake reality, were examined. The motivation of the paper is to evaluate the assembly areas in Istanbul on the basis of all districts under expert opinions and to compare and rank the suitability of the currently existing emergency assembly areas for the expected major Istanbul earthquake. This ranking was made by the help of the fuzzy logic integration of the Multi Attributive Ideal Real Comparative Analysis (MAIRCA) method, which is one of the Multi-Criteria Decision-Making Techniques (MCDM). It is thought that this ranking will be useful in revealing the current situation of the districts and raising awareness. As far as is known, according to the results obtained from the paper in which the spherical fuzzy logic integrated MAIRCA technique was used for the first time, Kadıköy district was determined as the district with the best conditions assembly areas.

Examination of emergency assembly areas based on planning criteria after the two major earthquakes on 6 February, 2023: A case study from Turkey

This study aimed to examine the compliance of post-disaster emergency assembly areas with their planning criteria in the Battalgazi district of Malatya province. This district is one of the settlements that was most affected by the two big earthquakes that occurred in Türkiye on 6 February 2023. The emergency assembly areas were evaluated qualitatively based on the criterion of “appropriateness”, with the sub-variables of “usability”, “accessibility”, and “safety”. They were also evaluated quantitatively based on the criterion of “adequacy” with the sub-variable “per capita m2”. There are a total of 103 neighborhoods in the district. However, there are only eight emergency assembly areas in total within its boundaries. According to the results of this study, only 7.5% of the current population of the district resides within 500 m of the emergency assembly areas. The fact that four emergency assembly areas (Hürriyet Park, Şehit Kemal Özalper High School, the Community Garden, Battalgazi Municipality) are situated next to each other and there are emergency assembly areas in only six of the 103 neighborhoods within the municipal boundaries shows that were significant problems in the decisions made regarding their locations. In addition, it was determined that there were disadvantages in terms of accessibility and usability within the criterion of appropriateness, while there were some positive aspects in terms of safety. When examined with regard to the criterion of adequacy, it was determined that the emergency assembly areas at Mişmiş Park, the Community Garden, Battalgazi Municipality, and Şehit Kemal Özalper High School were most adequate, while the emergency assembly areas at Hürriyet Park, Fırat Neighborhood Mukhtar, Nevzat Er Park, and 100 Yıl İmam Hatip Secondary School were least adequate.

A study on the adequacy of gathering areas as urban spaces

Türkiye is located in a geography of the world that can be classified as a “high risk” in terms of earthquakes. During and after an earthquake, people feel the need to leave the structures they are in and reach open areas to protect themselves and feel safe. In addition to contributing to the city in a social, psychological, economic and aesthetic sense, these areas should be increased in number and quality, as they are used in accordance with the needs of people for the purpose of escaping from the earthquake disaster, shelter, housing. The open areas scattered throughout the city have been designated as disaster and emergency gathering areas according to the fact that they meet some of the standards mentioned in this study. The main question here is whether the urban open and green space system used as ’gathering areas' is in sufficient and appropriate conditions to respond to the needs after the earthquake and shorten the return to normalcy process. This study was designed to raise awareness of students about the use of urban spaces after the earthquake that occurred on February 6, 2023 and to reveal the level of gathering areas around them. Within the scope of the Urban Design course, students who are in different provinces due to online education were asked for information about the closest gathering area to them, including the distance of their places of residence to the gathering areas, the size of the gathering areas and their current use. In this context, the data related to the collection areas were collected from the students and discussed with the relevant literature. As a result, suggestions were made about the issues that should be taken into account when planning and designing the assembly area.

Prioritization of emergency assembly points in a campus using grey p-median linear programming model

PurposeThe purpose of this paper is to propose a scenario-based grey methodology using clustering and optimizing with imprecise and uncertain body size data in an emergency assembly point area to assign the people on a campus to reach the emergency assembly points under uncertain disaster times.Design/methodology/approachGrey clustering and a new grey p-median linear programming model are developed to determine which units to assign to the pre-determined assembly points for a main campus in case of a disaster. The models have two scenarios: 70 and 100% occurrence capacities of administrative and academic personnel and students.FindingsIn this study, the academic and administrative units have been assigned to determine five different emergency assembly points on the main campus by using the numbers of the academic and administrative personnel and student and distances of the units to the assembly point areas of each other. The alternative solutions are obtained effectively by evaluating capacity utilization rates in the scenarios.Practical implicationsIt is often unclear when disasters can occur and therefore, a preliminary preparation time must be required to minimize the risk. In the case of natural, man-made (unnatural) or technological disasters, the people are required to defend themselves and move away from the disaster area as soon as possible in a proper direction. The proposed assignment model yields a final solution that effectively eliminates uncertainty regarding the selection of emergency assembly points for administrative and academic staff as well as students, in the event of disasters.Originality/valueGrey clustering suggests an assignment plan and concurrently, an investigation is underway utilizing the grey p-median linear programming model. This investigation aims to optimize various scenarios and body sizes concerning emergency assembly areas. All campus users who are present at the disaster in units of the campus are getting uncertainty about which emergency assembly point to use, and with this study, the vital risks aim to be ultimately reduced with reasonable plans.

Investigation of the interaction between corium and metal-coolers at the VCG-135 test bench in the conditions of a severe accident

This article presents the results of research after a series of experiments at the VCG-135 test bench to study the interaction between corium and candidate metal-coolers. Metal-coolers can be used to organize a heat removing from the surface of the corium in the core catcher until the cooling water supply. Zinc, antimony and manganese were selected as the investigated candidate metal-coolers.As a result of the conducted research, the patterns and features of the interaction of metals with corium in the conditions of discharging fragments of solid metal into the corium melt have been established. The macro and microstructure of the solidified compositions of the products of the interaction of corium with metal coolers, the elemental composition to determine the presence of the studied metals in their structure were studied. An elemental analysis of material samples in various areas of the experimental assembly and the working chamber of the VCG-135 test bench was conducted to determine the pattern of migration of corium components and interaction products from the melting volume.

ANALYSIS OF MUSCULOSKELETAL DISORDERS COMPLAINTS OF ASSEMBLY AND DECORATION AREA WORKERS AT PT. X

One of the tasks of humans in the industrial world is moving and transporting materials at great risk of triggering Musculoskeletal Disorders (MSDs). One production area with the potential for occupational disease hazards is the Assembly and Decoration area, which is a place for mixing colors. This area has a fairly high potential for occupational diseases in the form of MSDs because everyday workers always use manual product handling or what is known as lifting for 8 hours, hence workers often experience complaints of MSDs on the back, waist, shoulders, and arms. This research is a descriptive quantitative research type with analytical observational methods. This research is cross-sectional. The population in this study was 30 workers in the assembly and decoration area of ​​PT. X. Measurement of MSDs among workers in the Assembly and Decoration areas using the Nordic Body Map (NBM) questionnaire and the RULA method. The results of measurements using the Nordic Body Map (NBM) questionnaire show that workers in the Assembly and Decoration sections have the potential to experience MSDs problems. Apart from that, based on the results of RULA measurements on Assembly and Decoration workers, a total score of 5 was obtained. So it can be concluded that this work is in the medium category and action is needed soon.

Generation Gap in the Workforce: A Comparative Analysis of Staff and Technician Perspectives (Study case in manufacturing company PT XYZ)

The idea of the generation gap has evolved as an important and interesting feature in today's employment world. The generation gap refers to the variations in values, attitudes, and expectations among members of different generational cohorts, such as Generation Z, Millennials, Gen X, and Baby Boomers. This study, conducted at Cikarang's PT XYZ manufacturing business, examines the complex dynamics of the generation gap, with a major focus on the final assembly area. Our qualitative study method aims to clarify the various reasons affecting these phenomena and the techniques management uses to go through these intergenerational gaps effectively. This research aims to evaluate the existence of generational gaps inside the company, the complexity of these gaps, and management's activities to resolve them. Management at PT XYZ employs various techniques, such as training programs and mentorship initiatives, to address these intergenerational gaps. In conclusion, this research emphasizes the importance of recognizing and managing these generational gaps, with ongoing adaptation by management being important for sustained organizational success.

A new lean tool to enhance internal logistics in Engineer and Design-to-Order industrial environment: plan for every order

ABSTRACT The paper presents a new Lean Logistics tool specifically designed for Engineer and Design-To-Order (ETO and DTO) industrial environments. The new tool, namely Plan For Every Order (PFEO), conceptually derives from the well-known Plan For Every Part used in the automotive serial production context. PFEO is proposed as a tool for industrialization, focusing on the design and logistics optimization of internal material flows at ETO and DTO plants. In the paper, the principles, and concepts behind PFEO are presented and developed. The tool collects information on both suppliers and materials, improving both the management of materials and spaces and communication between the company and suppliers. The operability of the tool is proven in a real business case involving an shipyard. The PFEO has provided a solid database for the development of auxiliary monitoring and visualization tools, the application of which increases order in the warehouse and assembly areas and reduces costs and errors.

A Human Digital Twin of Disabled Workers for Production Planning

Including disabled workers in value-creating work processes is a fundamental and guaranteed human right and is, therefore, an essential goal of society. In Germany, sheltered workshops create the conditions for this inclusion since they are essential to companies' value chains. A central challenge is the inclusion of disabled workers in the value-creation processes, such as in manufacturing or assembly areas. The skills of disabled workers vary since they have individual impairments. Therefore, this paper presents a digital human model, a Human Digital Twin (HDT), for disabled workers. The model maps their skills and supports the production planning and assembly processes.

FORMATION OF PRODUCT ASSORTMENT OF RETAIL ENTERPRISES

The article examines the peculiarities of the formation of the product range of retail trade. An optimal product range was formed in order to increase consumer loyalty to the company's products. In the article have been defined that in the direction to ensure consumer loyalty to the company, first of all, the optimal assortment should be formed and, accordingly, the formation of goods should be carried out. Namely, the application of the integrated ABC/FMR analysis of the product range allows you to classify product stocks according to the criteria of "profitability of product sales" and "level of demand», and will contribute to the formation of an optimal product range which helps to ensure the rhythmic work of the trading company and serves as the basis for achieving the target indicators of economic activity. The application of the integrated ABC/FMR analysis of the product range made it possible to classify the product stocks according to such criteria as: "profitability of product sales" and "level of demand", which, thereby, will contribute to the formation of the optimal product range, ensuring a high level of efficiency of the trading enterprise. The proposed approach to structuring the product range, which is based on the results ofккня ABC/FMR analysis, makes it possible to classify the entire set of product units in the selected product line into nine subgroups. It also has been identified that in sales management, the "degree of demand" of a product or the requests frequency for certain groups of products serves as an important criterion for positioning product groups in the marketing strategy of management (the slogan "we have them all"). In goods management, FMR analysis is used to determine the location of goods storage, so the most frequently requested ("fast" - fast) positions are located closer to the assembly areas.

A comparative Life Cycle Assessment of vulnerable dwellings along Davao River Basin using Athena Impact Estimator for Buildings

Every year, more and more buildings are built, but many have problems because they are exposed to harsh weather and are used. Some of these problems are cracks, dead holes, and a high level of air infiltration, all affecting how much energy is used. This study aims to compare the embodied energy (EE) using life cycle analysis (LCA) of a row house model and a walk-up apartment model of housing in the riverine area of the Davao River. Assessment of the tool's life cycle is the research approach used for this investigation (LCA). A life cycle perspective can be helpful in several situations, including but not limited to better appreciating the potential benefits of the repurposing project and its impacts on the environment and providing information for future building stock management. Results have shown that row housing produces more building materials than walk-up buildings, with almost 50% less consumed. The row housing model also has a higher environmental impact on the assembly areas: foundation, roofing, and flooring materials. Meanwhile, walk-up dwellings contribute more wall components, columns, and beams. The findings of the life cycle assessments revealed that, in general, row housing units were impacted more during the production stage (A1 to A3), with 86% of the total. Throughout the same period, walk-up residences had a higher contribution during the construction phase (A4 and A5) with 11% and beyond the building life (D) with an average of 6%. Both models tie in with 2% for the use category (B2, B4, and B6) and 11% for the end-of-life category (C1 to C4). Row housing units impact the surrounding environment more than walk-up apartment units, assuming that the same measurement criteria are objectively applied to both models. According to the study's findings, implementing in-situ vertical development in sensitive areas is preferable because it involves less material consumption and has a smaller negative impact on the surrounding environment.

High Cleanliness and High Hydrophobic/Hydrophilic Contrast Done by Direct Wafer Bonding for Die-to-Wafer Self-Assembly

Die-to-wafer assembly is a promising technology for 3D-integration in terms of yield. However, it is difficult to combine high placement accuracy and high throughput with a pick and place process. To overcome these issues, self-assembly and collective transfer for die-to-wafer were proposed [1].With the self-assembly technology, direct bonding is used for the assembly and the surface tension of liquid droplets drives the chips and precisely aligns them to predetermined assembly areas on carrier wafers. A good water containment on the bonding site is needed to ensure a precise alignment. It is controlled by two parameters: topographical and hydrophilic/hydrophobic contrast. A step of around 15 µm surrounding the bonding area plays the role of the topographical contrast. The hydrophilic/hydrophobic contrast is obtained by coating an hydrophobic organic compound around the hydrophilic bonding site. Collective transfer can be achieved when dies are simultaneously bonded onto a target wafer covered with bonding sites (see figure 1).The preparation of the target wafer as well as dies is a major topic of interest. As shown in figure 2 the direct bonding site is often defined by lithographic means: step and hydrophobic coating [2]. Extremely cleaned surfaces are required to ensure a good bonding quality. As a consequence, all particles and organic traces must be perfectly removed during the resist stripping step. It is here challenging as the organic resist must be removed while preserving the organic hydrophobic material. Highly aggressive and efficient stripping solutions cannot be used to obtain very clean bonding surfaces and an alternative process had to be developed.We propose an innovative process based on a temporary bonding protection of the bonding site for the hydrophobic coating. A typical flow is presented in figure 2. A standard photolithography and etching process is used to obtain steps at the edges of the bonding site. An efficient stripping based on plasma and wet cleaning yields a surface that is ready for bonding. This surface is bonded with another temporary wafer. The resulting stack is dipped in a solution of hydrophobic material and then dismounted.As a demonstration, 40 target bonding sites were defined onto a 200 mm diameter silicon wafer. First, a 2µm thick oxide layer was deposited. Then, bonding sites were defined by photolithography and etching. The step height was 15 µm and bonding areas 8x8 mm². This wafer was bonded to a temporary carrier. The acoustic picture of the resulting stack is provided in figure 3a): all bonding sites were correctly bonded on the carrier. The stack was then dipped in a fluorinated polymer solution. After dismounting the temporary carrier, the water contact angle of the surface was measured: it was around 10° on the bonding site and 90° on the surrounding area. A SEM image confirmed the presence of the hydrophobic polymer on the surrounding area but also on the sidewalls of steps (figure 3b).In the same way, 10x10 mm² dies with 8x8 mm² bonding sites were fabricated. A collective bonding between the target wafer and the 40 dies was performed: 10 µL droplets were deposited onto each bonding site. 70 % of dies were transferred onto the target wafer. The alignment performance was evaluated with dedicated marks on target and dies: 50 % of die were aligned with a precision below 1 µm. The stack withstood a 2h annealing at 400°C without any defect appearance. These results demonstrate the interest of the new process for the fabrication of high contrasted surfaces for self-assembly bonding while keeping a very high cleanliness of the hydrophilic bonding area.The authors acknowledge financial support from INTEL Corporation, United States[1] T. Fukushima, Proc. Int. Electron Dev. Meet., 2005, pp. 359–362.[2] A. Bond , 2022 IEEE 72nd Electronic Components and Technology Conference (ECTC), San Diego, CA, USA, 2022, pp. 168-176. Figure 1

Characteristics of different flow patterns for proton exchange membrane water electrolysis with circular geometry

This study comprehensively analyzes five circular-shaped flow field configurations (one-path, two-path, two-channel, two-segment, and four-segment serpentine), using membrane electrode assembly (MEA) area of 38.5 cm2. Here, it aims to identify the optimal pattern in terms of velocity, pressure, liquid saturation, temperature, and current density distribution. Further, a comparison is conducted between the uniformity index, polarization curves, and average membrane temperature curves of various cases. Using a finite element method, a three-dimensional, non-isothermal, two-phase model is developed based on the conservation equations of mass, momentum, electric charge, energy, and species. To confirm modelling reliability, the numerical results have been validated and demonstrated a strong match with the experimental data. Findings indicate that the one-path, followed by the two-path serpentine pattern, yield the most favorable flow distribution and temperature uniformity within the PEMWE. Conversely, the four-segment serpentine flow pattern results in the least desirable outcomes. At a cell voltage of 2.1 V, the uniformity index of liquid saturation, temperature and current density and average membrane temperature for one-path and two-path serpentine patterns exhibit reductions of 70 and 29 %, 95.5 and 95.2 %, 33 and 31 %, and 9.1 and 6 K, respectively, compared to four-segment serpentine design. Moreover, the four-segment, two-segment, and two-path serpentine flow patterns exhibit optimal performance in terms of polarization curves.

Evaluation of Fire Protection systems in Residential High-rise Buildings for Evacuation Optimisation- A Case of Bengaluru

Significance of the research- Among different types of occupancies, a Residential high-rise building presents a more significant challenge to fire protection due to its functionality, complexity, and economic value. Objective of the study- The key objective of the present paper was to examine the situation of physical (as opposed to non-physical) fire protection systems in randomly selected Residential high-rise buildings in Bengaluru for Evacuation optimization. Methodology- Methods used include Physical observation, document review, and interviews. A multi-attribute evaluation model/approach was applied to establish the sufficiency or suitability of fire protection systems in light of NBC-2016 [1] and Bangalore Byelaws-2016. The study reveals that fire-fighting/evacuation lifts and other fire protection systems are primarily present in the buildings. Nevertheless, due to inadequate maintenance or unsuitable elements, their safety performance is compromised. Research findings- The analysis revealed that fire hoses and hydrants demonstrated the highest level of adequacy and suitability in terms of their number, locations, and maintenance across the buildings. Conversely, only 50% of the buildings had a sprinkler system that was sufficiently installed, indicating a need for improved coverage and maintenance, possibly due to cost considerations. The performance of other systems was as follows: fire driveways (83%), fire escape staircases (83%), fire detection and alarm (40%), corridors and passageways (67%), assembly areas (83%), hose reels and hydrants (100%), fire brigade access and facilities (67%), safety signs and notices (17%), portable fire extinguishers (50%), and fire audits (17%). Based on these findings, it is recommended to prioritize increased efforts in inspecting and maintaining fire protection systems throughout the lifespan of the project to address the identified shortcomings. Additionally, the design of residential high-rise buildings should incorporate provisions for fire-fighting evacuation lifts and facilities catering to the needs of disabled individuals.

E-Chem Education: A Crash Course in Electrochemical Engineering for Caustic Soda Plant Design

The capstone chemical engineering senior process design course at Penn State in spring 2023 tasked students with designing a caustic soda process to partially meet the global demand for commoditized sodium hydroxide. This article disseminates our experience teaching senior chemical engineering students the core tenets of electrochemical engineering in a single class period for designing an electrolytic caustic soda process. In this E-Chem Education article, we relate key concepts found in chemical engineering (such as sizing up a reactor volume), which chemical engineering seniors are adept with, to electrochemical engineering principles (e.g., current density, voltage, and membrane electrode assembly area) for sizing up and costing out a chlor-alkali electrolyzer. Furthermore, we also discuss alternative electrolyzer designs outside the traditional chlor-alkali process, such as oxygen depolarized cathode (ODC) chlor-alkali and bipolar membrane electrodialysis (BPMED), for caustic soda production and the pros and cons of the alternative process designs.

Polyhedral Colloidal Clusters Assembled from Amphiphilic Nanoparticles in Deformable Droplets.

Polyhedral colloidal clusters assembled from functional inorganic nanoparticles have attracted great interest in both scientific research and applications. However, the spontaneous assembly of colloidal nanoparticles into polyhedral clusters with regular shape and tunable structures remains a grand challenges. Here, we successfully construct Mackay icosahedral and regular tetrahedral colloidal clusters assembled from gold nanoparticles grafted with a mixture of polystyrene (PS) and poly(2-vinylpyridine) (P2VP) homopolymers by precisely tuning the interfacial interaction between the nanoparticles and the oil/water interface. By increasing the proportion of hydrophilic P2VP ligands on the surface of gold nanoparticles, the Mackay icosahedral clusters can transform into regular tetrahedral clusters in order to maximize the surface area of the polyhedral assembly. Furthermore, we reveal the formation mechanism of these regular polyhedral colloidal clusters. The formation of polyhedral colloidal clusters is not only dependent on the entropy but also determined by the interfacial free energy. This finding demonstrates an effective approach to organize nanoparticles into polyhedral colloidal clusters with potential applications in various fields.